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postmaster.c File Reference
#include "postgres.h"
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <sys/wait.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <limits.h>
#include "access/transam.h"
#include "access/xlog.h"
#include "bootstrap/bootstrap.h"
#include "catalog/pg_control.h"
#include "common/ip.h"
#include "lib/ilist.h"
#include "libpq/auth.h"
#include "libpq/libpq.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "pg_getopt.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/bgworker_internals.h"
#include "postmaster/fork_process.h"
#include "postmaster/pgarch.h"
#include "postmaster/postmaster.h"
#include "postmaster/syslogger.h"
#include "replication/logicallauncher.h"
#include "replication/walsender.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
#include "utils/dynamic_loader.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
#include "utils/timeout.h"
#include "utils/varlena.h"
Include dependency graph for postmaster.c:

Go to the source code of this file.

Data Structures

struct  bkend
 

Macros

#define BACKEND_TYPE_NORMAL   0x0001 /* normal backend */
 
#define BACKEND_TYPE_AUTOVAC   0x0002 /* autovacuum worker process */
 
#define BACKEND_TYPE_WALSND   0x0004 /* walsender process */
 
#define BACKEND_TYPE_BGWORKER   0x0008 /* bgworker process */
 
#define BACKEND_TYPE_ALL   0x000F /* OR of all the above */
 
#define BACKEND_TYPE_WORKER   (BACKEND_TYPE_AUTOVAC | BACKEND_TYPE_BGWORKER)
 
#define MAXLISTEN   64
 
#define NoShutdown   0
 
#define SmartShutdown   1
 
#define FastShutdown   2
 
#define ImmediateShutdown   3
 
#define SIGKILL_CHILDREN_AFTER_SECS   5
 
#define SignalChildren(sig)   SignalSomeChildren(sig, BACKEND_TYPE_ALL)
 
#define PgArchStartupAllowed()
 
#define StartupDataBase()   StartChildProcess(StartupProcess)
 
#define StartBackgroundWriter()   StartChildProcess(BgWriterProcess)
 
#define StartCheckpointer()   StartChildProcess(CheckpointerProcess)
 
#define StartWalWriter()   StartChildProcess(WalWriterProcess)
 
#define StartWalReceiver()   StartChildProcess(WalReceiverProcess)
 
#define EXIT_STATUS_0(st)   ((st) == 0)
 
#define EXIT_STATUS_1(st)   (WIFEXITED(st) && WEXITSTATUS(st) == 1)
 
#define EXIT_STATUS_3(st)   (WIFEXITED(st) && WEXITSTATUS(st) == 3)
 
#define OPTS_FILE   "postmaster.opts"
 

Typedefs

typedef struct bkend Backend
 

Enumerations

enum  StartupStatusEnum { STARTUP_NOT_RUNNING, STARTUP_RUNNING, STARTUP_SIGNALED, STARTUP_CRASHED }
 
enum  PMState {
  PM_INIT, PM_STARTUP, PM_RECOVERY, PM_HOT_STANDBY,
  PM_RUN, PM_WAIT_BACKUP, PM_WAIT_READONLY, PM_WAIT_BACKENDS,
  PM_SHUTDOWN, PM_SHUTDOWN_2, PM_WAIT_DEAD_END, PM_NO_CHILDREN
}
 

Functions

static void CloseServerPorts (int status, Datum arg)
 
static void unlink_external_pid_file (int status, Datum arg)
 
static void getInstallationPaths (const char *argv0)
 
static void checkDataDir (void)
 
static PortConnCreate (int serverFd)
 
static void ConnFree (Port *port)
 
static void reset_shared (int port)
 
static void SIGHUP_handler (SIGNAL_ARGS)
 
static void pmdie (SIGNAL_ARGS)
 
static void reaper (SIGNAL_ARGS)
 
static void sigusr1_handler (SIGNAL_ARGS)
 
static void startup_die (SIGNAL_ARGS)
 
static void dummy_handler (SIGNAL_ARGS)
 
static void StartupPacketTimeoutHandler (void)
 
static void CleanupBackend (int pid, int exitstatus)
 
static bool CleanupBackgroundWorker (int pid, int exitstatus)
 
static void HandleChildCrash (int pid, int exitstatus, const char *procname)
 
static void LogChildExit (int lev, const char *procname, int pid, int exitstatus)
 
static void PostmasterStateMachine (void)
 
static void BackendInitialize (Port *port)
 
static void BackendRun (Port *port) pg_attribute_noreturn()
 
static void ExitPostmaster (int status) pg_attribute_noreturn()
 
static int ServerLoop (void)
 
static int BackendStartup (Port *port)
 
static int ProcessStartupPacket (Port *port, bool SSLdone)
 
static void processCancelRequest (Port *port, void *pkt)
 
static int initMasks (fd_set *rmask)
 
static void report_fork_failure_to_client (Port *port, int errnum)
 
static CAC_state canAcceptConnections (void)
 
static bool RandomCancelKey (int32 *cancel_key)
 
static void signal_child (pid_t pid, int signal)
 
static bool SignalSomeChildren (int signal, int targets)
 
static void TerminateChildren (int signal)
 
static int CountChildren (int target)
 
static void maybe_start_bgworker (void)
 
static bool CreateOptsFile (int argc, char *argv[], char *fullprogname)
 
static pid_t StartChildProcess (AuxProcType type)
 
static void StartAutovacuumWorker (void)
 
static void InitPostmasterDeathWatchHandle (void)
 
void PostmasterMain (int argc, char *argv[])
 
static void DetermineSleepTime (struct timeval *timeout)
 
void ClosePostmasterPorts (bool am_syslogger)
 
int MaxLivePostmasterChildren (void)
 
void BackgroundWorkerInitializeConnection (char *dbname, char *username)
 
void BackgroundWorkerInitializeConnectionByOid (Oid dboid, Oid useroid)
 
void BackgroundWorkerBlockSignals (void)
 
void BackgroundWorkerUnblockSignals (void)
 
static void do_start_bgworker (RegisteredBgWorker *rw)
 
static bool bgworker_should_start_now (BgWorkerStartTime start_time)
 
static bool assign_backendlist_entry (RegisteredBgWorker *rw)
 
bool PostmasterMarkPIDForWorkerNotify (int pid)
 

Variables

static dlist_head BackendList = DLIST_STATIC_INIT(BackendList)
 
BackgroundWorkerMyBgworkerEntry = NULL
 
int PostPortNumber
 
char * Unix_socket_directories
 
char * ListenAddresses
 
int ReservedBackends
 
static pgsocket ListenSocket [MAXLISTEN]
 
static char ExtraOptions [MAXPGPATH]
 
static bool Reinit = true
 
static int SendStop = false
 
bool EnableSSL = false
 
int PreAuthDelay = 0
 
int AuthenticationTimeout = 60
 
bool log_hostname
 
bool Log_connections = false
 
bool Db_user_namespace = false
 
bool enable_bonjour = false
 
char * bonjour_name
 
bool restart_after_crash = true
 
static pid_t StartupPID = 0
 
static pid_t BgWriterPID = 0
 
static pid_t CheckpointerPID = 0
 
static pid_t WalWriterPID = 0
 
static pid_t WalReceiverPID = 0
 
static pid_t AutoVacPID = 0
 
static pid_t PgArchPID = 0
 
static pid_t PgStatPID = 0
 
static pid_t SysLoggerPID = 0
 
static StartupStatusEnum StartupStatus = STARTUP_NOT_RUNNING
 
static int Shutdown = NoShutdown
 
static bool FatalError = false
 
static PMState pmState = PM_INIT
 
static time_t AbortStartTime = 0
 
static bool ReachedNormalRunning = false
 
bool ClientAuthInProgress = false
 
bool redirection_done = false
 
static volatile sig_atomic_t start_autovac_launcher = false
 
static volatile bool avlauncher_needs_signal = false
 
static volatile bool StartWorkerNeeded = true
 
static volatile bool HaveCrashedWorker = false
 
static unsigned int random_seed = 0
 
static struct timeval random_start_time
 
int postmaster_alive_fds [2] = {-1, -1}
 

Macro Definition Documentation

#define BACKEND_TYPE_ALL   0x000F /* OR of all the above */
#define BACKEND_TYPE_AUTOVAC   0x0002 /* autovacuum worker process */

Definition at line 143 of file postmaster.c.

Referenced by pmdie(), and StartAutovacuumWorker().

#define BACKEND_TYPE_BGWORKER   0x0008 /* bgworker process */

Definition at line 145 of file postmaster.c.

Referenced by assign_backendlist_entry(), HandleChildCrash(), and pmdie().

#define BACKEND_TYPE_NORMAL   0x0001 /* normal backend */
#define BACKEND_TYPE_WALSND   0x0004 /* walsender process */

Definition at line 144 of file postmaster.c.

Referenced by CountChildren(), and SignalSomeChildren().

#define BACKEND_TYPE_WORKER   (BACKEND_TYPE_AUTOVAC | BACKEND_TYPE_BGWORKER)

Definition at line 148 of file postmaster.c.

Referenced by PostmasterStateMachine().

#define EXIT_STATUS_0 (   st)    ((st) == 0)

Definition at line 547 of file postmaster.c.

Referenced by CleanupBackend(), CleanupBackgroundWorker(), LogChildExit(), and reaper().

#define EXIT_STATUS_1 (   st)    (WIFEXITED(st) && WEXITSTATUS(st) == 1)

Definition at line 548 of file postmaster.c.

Referenced by CleanupBackend(), CleanupBackgroundWorker(), and reaper().

#define EXIT_STATUS_3 (   st)    (WIFEXITED(st) && WEXITSTATUS(st) == 3)

Definition at line 549 of file postmaster.c.

Referenced by reaper().

#define FastShutdown   2

Definition at line 271 of file postmaster.c.

Referenced by pmdie().

#define ImmediateShutdown   3

Definition at line 272 of file postmaster.c.

Referenced by HandleChildCrash(), pmdie(), PostmasterStateMachine(), and ServerLoop().

#define MAXLISTEN   64
#define NoShutdown   0
#define OPTS_FILE   "postmaster.opts"

Referenced by CreateOptsFile().

#define PgArchStartupAllowed ( )
Value:
#define XLogArchivingAlways()
Definition: xlog.h:137
static PMState pmState
Definition: postmaster.c:338
#define XLogArchivingActive()
Definition: xlog.h:134

Definition at line 435 of file postmaster.c.

Referenced by reaper(), and ServerLoop().

#define SIGKILL_CHILDREN_AFTER_SECS   5

Definition at line 344 of file postmaster.c.

Referenced by DetermineSleepTime(), and ServerLoop().

#define SignalChildren (   sig)    SignalSomeChildren(sig, BACKEND_TYPE_ALL)

Definition at line 420 of file postmaster.c.

Referenced by PostmasterStateMachine(), reaper(), SIGHUP_handler(), and TerminateChildren().

#define SmartShutdown   1

Definition at line 270 of file postmaster.c.

Referenced by pmdie(), reaper(), and SIGHUP_handler().

#define StartBackgroundWriter ( )    StartChildProcess(BgWriterProcess)

Definition at line 541 of file postmaster.c.

Referenced by reaper(), ServerLoop(), and sigusr1_handler().

#define StartCheckpointer ( )    StartChildProcess(CheckpointerProcess)

Definition at line 542 of file postmaster.c.

Referenced by PostmasterStateMachine(), reaper(), ServerLoop(), and sigusr1_handler().

#define StartupDataBase ( )    StartChildProcess(StartupProcess)

Definition at line 540 of file postmaster.c.

Referenced by PostmasterMain(), and PostmasterStateMachine().

#define StartWalReceiver ( )    StartChildProcess(WalReceiverProcess)

Definition at line 544 of file postmaster.c.

Referenced by sigusr1_handler().

#define StartWalWriter ( )    StartChildProcess(WalWriterProcess)

Definition at line 543 of file postmaster.c.

Referenced by reaper(), and ServerLoop().

Typedef Documentation

Enumeration Type Documentation

enum PMState
Enumerator
PM_INIT 
PM_STARTUP 
PM_RECOVERY 
PM_HOT_STANDBY 
PM_RUN 
PM_WAIT_BACKUP 
PM_WAIT_READONLY 
PM_WAIT_BACKENDS 
PM_SHUTDOWN 
PM_SHUTDOWN_2 
PM_WAIT_DEAD_END 
PM_NO_CHILDREN 

Definition at line 320 of file postmaster.c.

321 {
322  PM_INIT, /* postmaster starting */
323  PM_STARTUP, /* waiting for startup subprocess */
324  PM_RECOVERY, /* in archive recovery mode */
325  PM_HOT_STANDBY, /* in hot standby mode */
326  PM_RUN, /* normal "database is alive" state */
327  PM_WAIT_BACKUP, /* waiting for online backup mode to end */
328  PM_WAIT_READONLY, /* waiting for read only backends to exit */
329  PM_WAIT_BACKENDS, /* waiting for live backends to exit */
330  PM_SHUTDOWN, /* waiting for checkpointer to do shutdown
331  * ckpt */
332  PM_SHUTDOWN_2, /* waiting for archiver and walsenders to
333  * finish */
334  PM_WAIT_DEAD_END, /* waiting for dead_end children to exit */
335  PM_NO_CHILDREN /* all important children have exited */
336 } PMState;
PMState
Definition: postmaster.c:320
Enumerator
STARTUP_NOT_RUNNING 
STARTUP_RUNNING 
STARTUP_SIGNALED 
STARTUP_CRASHED 

Definition at line 258 of file postmaster.c.

259 {
262  STARTUP_SIGNALED, /* we sent it a SIGQUIT or SIGKILL */
StartupStatusEnum
Definition: postmaster.c:258

Function Documentation

static bool assign_backendlist_entry ( RegisteredBgWorker rw)
static

Definition at line 5628 of file postmaster.c.

References AssignPostmasterChildSlot(), BACKEND_TYPE_BGWORKER, bkend::bgworker_notify, bkend::bkend_type, bkend::cancel_key, bkend::child_slot, bkend::dead_end, ereport, errcode(), errmsg(), GetCurrentTimestamp(), LOG, malloc, MyCancelKey, MyPMChildSlot, NULL, RandomCancelKey(), RegisteredBgWorker::rw_backend, RegisteredBgWorker::rw_child_slot, and RegisteredBgWorker::rw_crashed_at.

Referenced by maybe_start_bgworker().

5629 {
5630  Backend *bn;
5631 
5632  /*
5633  * Compute the cancel key that will be assigned to this session. We
5634  * probably don't need cancel keys for background workers, but we'd better
5635  * have something random in the field to prevent unfriendly people from
5636  * sending cancels to them.
5637  */
5639  {
5640  ereport(LOG,
5641  (errcode(ERRCODE_INTERNAL_ERROR),
5642  errmsg("could not generate random cancel key")));
5643 
5645  return false;
5646  }
5647 
5648  bn = malloc(sizeof(Backend));
5649  if (bn == NULL)
5650  {
5651  ereport(LOG,
5652  (errcode(ERRCODE_OUT_OF_MEMORY),
5653  errmsg("out of memory")));
5654 
5655  /*
5656  * The worker didn't really crash, but setting this nonzero makes
5657  * postmaster wait a bit before attempting to start it again; if it
5658  * tried again right away, most likely it'd find itself under the same
5659  * memory pressure.
5660  */
5662  return false;
5663  }
5664 
5665  bn->cancel_key = MyCancelKey;
5668  bn->dead_end = false;
5669  bn->bgworker_notify = false;
5670 
5671  rw->rw_backend = bn;
5672  rw->rw_child_slot = bn->child_slot;
5673 
5674  return true;
5675 }
struct bkend * rw_backend
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1688
int errcode(int sqlerrcode)
Definition: elog.c:575
#define LOG
Definition: elog.h:26
bool bgworker_notify
Definition: postmaster.c:179
int AssignPostmasterChildSlot(void)
Definition: pmsignal.c:151
#define malloc(a)
Definition: header.h:45
int32 MyCancelKey
Definition: globals.c:41
int32 cancel_key
Definition: postmaster.c:169
bool dead_end
Definition: postmaster.c:178
#define ereport(elevel, rest)
Definition: elog.h:122
#define BACKEND_TYPE_BGWORKER
Definition: postmaster.c:145
static bool RandomCancelKey(int32 *cancel_key)
Definition: postmaster.c:5123
int child_slot
Definition: postmaster.c:170
int bkend_type
Definition: postmaster.c:177
#define NULL
Definition: c.h:226
int MyPMChildSlot
Definition: globals.c:42
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void BackendInitialize ( Port port)
static

Definition at line 4064 of file postmaster.c.

References SockAddr::addr, am_walsender, AuthenticationTimeout, BlockSig, ClientAuthInProgress, Port::database_name, DestRemote, disable_timeout(), enable_timeout_after(), ereport, errmsg(), errmsg_internal(), gai_strerror, GetCurrentTimestamp(), init_ps_display(), InitializeTimeouts(), LOG, Log_connections, log_hostname, MyProcPort, MyStartTime, NI_MAXHOST, NI_MAXSERV, NI_NUMERICHOST, NI_NUMERICSERV, pg_getnameinfo_all(), PG_SETMASK, pg_usleep(), port, pq_init(), pqsignal(), PreAuthDelay, proc_exit(), ProcessStartupPacket(), Port::raddr, RegisterTimeout(), Port::remote_host, Port::remote_hostname, Port::remote_port, SockAddr::salen, Port::SessionStartTime, SIGQUIT, snprintf(), startup_die(), STARTUP_PACKET_TIMEOUT, StartupBlockSig, StartupPacketTimeoutHandler(), status(), STATUS_OK, timestamptz_to_time_t(), update_process_title, Port::user_name, WARNING, and whereToSendOutput.

Referenced by BackendStartup().

4065 {
4066  int status;
4067  int ret;
4068  char remote_host[NI_MAXHOST];
4069  char remote_port[NI_MAXSERV];
4070  char remote_ps_data[NI_MAXHOST];
4071 
4072  /* Save port etc. for ps status */
4073  MyProcPort = port;
4074 
4075  /*
4076  * PreAuthDelay is a debugging aid for investigating problems in the
4077  * authentication cycle: it can be set in postgresql.conf to allow time to
4078  * attach to the newly-forked backend with a debugger. (See also
4079  * PostAuthDelay, which we allow clients to pass through PGOPTIONS, but it
4080  * is not honored until after authentication.)
4081  */
4082  if (PreAuthDelay > 0)
4083  pg_usleep(PreAuthDelay * 1000000L);
4084 
4085  /* This flag will remain set until InitPostgres finishes authentication */
4086  ClientAuthInProgress = true; /* limit visibility of log messages */
4087 
4088  /* save process start time */
4091 
4092  /* set these to empty in case they are needed before we set them up */
4093  port->remote_host = "";
4094  port->remote_port = "";
4095 
4096  /*
4097  * Initialize libpq and enable reporting of ereport errors to the client.
4098  * Must do this now because authentication uses libpq to send messages.
4099  */
4100  pq_init(); /* initialize libpq to talk to client */
4101  whereToSendOutput = DestRemote; /* now safe to ereport to client */
4102 
4103  /*
4104  * We arrange for a simple exit(1) if we receive SIGTERM or SIGQUIT or
4105  * timeout while trying to collect the startup packet. Otherwise the
4106  * postmaster cannot shutdown the database FAST or IMMED cleanly if a
4107  * buggy client fails to send the packet promptly. XXX it follows that
4108  * the remainder of this function must tolerate losing control at any
4109  * instant. Likewise, any pg_on_exit_callback registered before or during
4110  * this function must be prepared to execute at any instant between here
4111  * and the end of this function. Furthermore, affected callbacks execute
4112  * partially or not at all when a second exit-inducing signal arrives
4113  * after proc_exit_prepare() decrements on_proc_exit_index. (Thanks to
4114  * that mechanic, callbacks need not anticipate more than one call.) This
4115  * is fragile; it ought to instead follow the norm of handling interrupts
4116  * at selected, safe opportunities.
4117  */
4118  pqsignal(SIGTERM, startup_die);
4120  InitializeTimeouts(); /* establishes SIGALRM handler */
4122 
4123  /*
4124  * Get the remote host name and port for logging and status display.
4125  */
4126  remote_host[0] = '\0';
4127  remote_port[0] = '\0';
4128  if ((ret = pg_getnameinfo_all(&port->raddr.addr, port->raddr.salen,
4129  remote_host, sizeof(remote_host),
4130  remote_port, sizeof(remote_port),
4131  (log_hostname ? 0 : NI_NUMERICHOST) | NI_NUMERICSERV)) != 0)
4132  ereport(WARNING,
4133  (errmsg_internal("pg_getnameinfo_all() failed: %s",
4134  gai_strerror(ret))));
4135  if (remote_port[0] == '\0')
4136  snprintf(remote_ps_data, sizeof(remote_ps_data), "%s", remote_host);
4137  else
4138  snprintf(remote_ps_data, sizeof(remote_ps_data), "%s(%s)", remote_host, remote_port);
4139 
4140  /*
4141  * Save remote_host and remote_port in port structure (after this, they
4142  * will appear in log_line_prefix data for log messages).
4143  */
4144  port->remote_host = strdup(remote_host);
4145  port->remote_port = strdup(remote_port);
4146 
4147  /* And now we can issue the Log_connections message, if wanted */
4148  if (Log_connections)
4149  {
4150  if (remote_port[0])
4151  ereport(LOG,
4152  (errmsg("connection received: host=%s port=%s",
4153  remote_host,
4154  remote_port)));
4155  else
4156  ereport(LOG,
4157  (errmsg("connection received: host=%s",
4158  remote_host)));
4159  }
4160 
4161  /*
4162  * If we did a reverse lookup to name, we might as well save the results
4163  * rather than possibly repeating the lookup during authentication.
4164  *
4165  * Note that we don't want to specify NI_NAMEREQD above, because then we'd
4166  * get nothing useful for a client without an rDNS entry. Therefore, we
4167  * must check whether we got a numeric IPv4 or IPv6 address, and not save
4168  * it into remote_hostname if so. (This test is conservative and might
4169  * sometimes classify a hostname as numeric, but an error in that
4170  * direction is safe; it only results in a possible extra lookup.)
4171  */
4172  if (log_hostname &&
4173  ret == 0 &&
4174  strspn(remote_host, "0123456789.") < strlen(remote_host) &&
4175  strspn(remote_host, "0123456789ABCDEFabcdef:") < strlen(remote_host))
4176  port->remote_hostname = strdup(remote_host);
4177 
4178  /*
4179  * Ready to begin client interaction. We will give up and exit(1) after a
4180  * time delay, so that a broken client can't hog a connection
4181  * indefinitely. PreAuthDelay and any DNS interactions above don't count
4182  * against the time limit.
4183  *
4184  * Note: AuthenticationTimeout is applied here while waiting for the
4185  * startup packet, and then again in InitPostgres for the duration of any
4186  * authentication operations. So a hostile client could tie up the
4187  * process for nearly twice AuthenticationTimeout before we kick him off.
4188  *
4189  * Note: because PostgresMain will call InitializeTimeouts again, the
4190  * registration of STARTUP_PACKET_TIMEOUT will be lost. This is okay
4191  * since we never use it again after this function.
4192  */
4195 
4196  /*
4197  * Receive the startup packet (which might turn out to be a cancel request
4198  * packet).
4199  */
4200  status = ProcessStartupPacket(port, false);
4201 
4202  /*
4203  * Stop here if it was bad or a cancel packet. ProcessStartupPacket
4204  * already did any appropriate error reporting.
4205  */
4206  if (status != STATUS_OK)
4207  proc_exit(0);
4208 
4209  /*
4210  * Now that we have the user and database name, we can set the process
4211  * title for ps. It's good to do this as early as possible in startup.
4212  *
4213  * For a walsender, the ps display is set in the following form:
4214  *
4215  * postgres: wal sender process <user> <host> <activity>
4216  *
4217  * To achieve that, we pass "wal sender process" as username and username
4218  * as dbname to init_ps_display(). XXX: should add a new variant of
4219  * init_ps_display() to avoid abusing the parameters like this.
4220  */
4221  if (am_walsender)
4222  init_ps_display("wal sender process", port->user_name, remote_ps_data,
4223  update_process_title ? "authentication" : "");
4224  else
4225  init_ps_display(port->user_name, port->database_name, remote_ps_data,
4226  update_process_title ? "authentication" : "");
4227 
4228  /*
4229  * Disable the timeout, and prevent SIGTERM/SIGQUIT again.
4230  */
4232  PG_SETMASK(&BlockSig);
4233 }
void InitializeTimeouts(void)
Definition: timeout.c:340
static void startup_die(SIGNAL_ARGS)
Definition: postmaster.c:5089
#define NI_NUMERICHOST
Definition: getaddrinfo.h:80
struct Port * MyProcPort
Definition: globals.c:40
bool update_process_title
Definition: ps_status.c:35
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1688
pg_time_t MyStartTime
Definition: globals.c:39
struct sockaddr_storage addr
Definition: pqcomm.h:64
void proc_exit(int code)
Definition: ipc.c:99
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
char * remote_port
Definition: libpq-be.h:130
#define LOG
Definition: elog.h:26
bool Log_connections
Definition: postmaster.c:239
#define SIGQUIT
Definition: win32.h:197
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
#define gai_strerror
Definition: getaddrinfo.h:148
int AuthenticationTimeout
Definition: postmaster.c:236
char * remote_hostname
Definition: libpq-be.h:126
bool ClientAuthInProgress
Definition: postmaster.c:348
SockAddr raddr
Definition: libpq-be.h:124
bool am_walsender
Definition: walsender.c:106
void pg_usleep(long microsec)
Definition: signal.c:53
void pq_init(void)
Definition: pqcomm.c:175
#define NI_MAXHOST
Definition: getaddrinfo.h:90
TimestampTz SessionStartTime
Definition: libpq-be.h:153
#define NI_MAXSERV
Definition: getaddrinfo.h:93
pg_time_t timestamptz_to_time_t(TimestampTz t)
Definition: timestamp.c:1871
char * user_name
Definition: libpq-be.h:139
ACCEPT_TYPE_ARG3 salen
Definition: pqcomm.h:65
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:970
bool log_hostname
Definition: postmaster.c:238
static int port
Definition: pg_regress.c:87
#define WARNING
Definition: elog.h:40
static int ProcessStartupPacket(Port *port, bool SSLdone)
Definition: postmaster.c:1909
sigset_t BlockSig
Definition: pqsignal.c:22
#define NI_NUMERICSERV
Definition: getaddrinfo.h:83
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
TimeoutId RegisterTimeout(TimeoutId id, timeout_handler_proc handler)
Definition: timeout.c:373
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
void enable_timeout_after(TimeoutId id, int delay_ms)
Definition: timeout.c:428
int pg_getnameinfo_all(const struct sockaddr_storage *addr, int salen, char *node, int nodelen, char *service, int servicelen, int flags)
Definition: ip.c:123
sigset_t StartupBlockSig
Definition: pqsignal.c:22
int PreAuthDelay
Definition: postmaster.c:235
char * remote_host
Definition: libpq-be.h:125
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void StartupPacketTimeoutHandler(void)
Definition: postmaster.c:5113
void disable_timeout(TimeoutId id, bool keep_indicator)
Definition: timeout.c:525
CommandDest whereToSendOutput
Definition: postgres.c:86
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:222
char * database_name
Definition: libpq-be.h:138
void init_ps_display(const char *username, const char *dbname, const char *host_info, const char *initial_str)
Definition: ps_status.c:244
static void BackendRun ( Port port)
static

Definition at line 4244 of file postmaster.c.

References Assert, av, Port::database_name, DEBUG3, ereport, errmsg_internal(), ExtraOptions, i, MemoryContextAlloc(), MemoryContextSwitchTo(), MyProcPid, NULL, pg_split_opts(), PostgresMain(), progname, random_seed, random_start_time, Port::SessionStartTime, srandom(), TimestampDifference(), TopMemoryContext, and Port::user_name.

Referenced by BackendStartup().

4245 {
4246  char **av;
4247  int maxac;
4248  int ac;
4249  long secs;
4250  int usecs;
4251  int i;
4252 
4253  /*
4254  * Don't want backend to be able to see the postmaster random number
4255  * generator state. We have to clobber the static random_seed *and* start
4256  * a new random sequence in the random() library function.
4257  */
4258 #ifndef HAVE_STRONG_RANDOM
4259  random_seed = 0;
4260  random_start_time.tv_usec = 0;
4261 #endif
4262  /* slightly hacky way to convert timestamptz into integers */
4263  TimestampDifference(0, port->SessionStartTime, &secs, &usecs);
4264  srandom((unsigned int) (MyProcPid ^ (usecs << 12) ^ secs));
4265 
4266  /*
4267  * Now, build the argv vector that will be given to PostgresMain.
4268  *
4269  * The maximum possible number of commandline arguments that could come
4270  * from ExtraOptions is (strlen(ExtraOptions) + 1) / 2; see
4271  * pg_split_opts().
4272  */
4273  maxac = 2; /* for fixed args supplied below */
4274  maxac += (strlen(ExtraOptions) + 1) / 2;
4275 
4276  av = (char **) MemoryContextAlloc(TopMemoryContext,
4277  maxac * sizeof(char *));
4278  ac = 0;
4279 
4280  av[ac++] = "postgres";
4281 
4282  /*
4283  * Pass any backend switches specified with -o on the postmaster's own
4284  * command line. We assume these are secure.
4285  */
4286  pg_split_opts(av, &ac, ExtraOptions);
4287 
4288  av[ac] = NULL;
4289 
4290  Assert(ac < maxac);
4291 
4292  /*
4293  * Debug: print arguments being passed to backend
4294  */
4295  ereport(DEBUG3,
4296  (errmsg_internal("%s child[%d]: starting with (",
4297  progname, (int) getpid())));
4298  for (i = 0; i < ac; ++i)
4299  ereport(DEBUG3,
4300  (errmsg_internal("\t%s", av[i])));
4301  ereport(DEBUG3,
4302  (errmsg_internal(")")));
4303 
4304  /*
4305  * Make sure we aren't in PostmasterContext anymore. (We can't delete it
4306  * just yet, though, because InitPostgres will need the HBA data.)
4307  */
4309 
4310  PostgresMain(ac, av, port->database_name, port->user_name);
4311 }
int MyProcPid
Definition: globals.c:38
#define DEBUG3
Definition: elog.h:23
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
const char * progname
Definition: pg_standby.c:37
static unsigned int random_seed
Definition: postmaster.c:369
TimestampTz SessionStartTime
Definition: libpq-be.h:153
void PostgresMain(int argc, char *argv[], const char *dbname, const char *username)
Definition: postgres.c:3561
void pg_split_opts(char **argv, int *argcp, const char *optstr)
Definition: postinit.c:436
char * user_name
Definition: libpq-be.h:139
#define ereport(elevel, rest)
Definition: elog.h:122
MemoryContext TopMemoryContext
Definition: mcxt.c:43
struct @18::@19 av[32]
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define NULL
Definition: c.h:226
static char ExtraOptions[MAXPGPATH]
Definition: postmaster.c:220
#define Assert(condition)
Definition: c.h:670
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:749
int i
void srandom(unsigned int seed)
Definition: srandom.c:22
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1791
char * database_name
Definition: libpq-be.h:138
static struct timeval random_start_time
Definition: postmaster.c:370
static int BackendStartup ( Port port)
static

Definition at line 3914 of file postmaster.c.

References AssignPostmasterChildSlot(), BACKEND_TYPE_NORMAL, BackendInitialize(), BackendRun(), bkend::bgworker_notify, bkend::bkend_type, CAC_OK, CAC_WAITBACKUP, Port::canAcceptConnections, canAcceptConnections(), bkend::cancel_key, bkend::child_slot, ClosePostmasterPorts(), bkend::dead_end, DEBUG2, dlist_push_head(), bkend::elem, ereport, errcode(), errmsg(), errmsg_internal(), fork_process(), free, InitPostmasterChild(), LOG, malloc, MyCancelKey, MyPMChildSlot, bkend::pid, RandomCancelKey(), ReleasePostmasterChildSlot(), report_fork_failure_to_client(), Port::sock, STATUS_ERROR, and STATUS_OK.

Referenced by ServerLoop().

3915 {
3916  Backend *bn; /* for backend cleanup */
3917  pid_t pid;
3918 
3919  /*
3920  * Create backend data structure. Better before the fork() so we can
3921  * handle failure cleanly.
3922  */
3923  bn = (Backend *) malloc(sizeof(Backend));
3924  if (!bn)
3925  {
3926  ereport(LOG,
3927  (errcode(ERRCODE_OUT_OF_MEMORY),
3928  errmsg("out of memory")));
3929  return STATUS_ERROR;
3930  }
3931 
3932  /*
3933  * Compute the cancel key that will be assigned to this backend. The
3934  * backend will have its own copy in the forked-off process' value of
3935  * MyCancelKey, so that it can transmit the key to the frontend.
3936  */
3938  {
3939  free(bn);
3940  ereport(LOG,
3941  (errcode(ERRCODE_INTERNAL_ERROR),
3942  errmsg("could not generate random cancel key")));
3943  return STATUS_ERROR;
3944  }
3945 
3946  bn->cancel_key = MyCancelKey;
3947 
3948  /* Pass down canAcceptConnections state */
3950  bn->dead_end = (port->canAcceptConnections != CAC_OK &&
3952 
3953  /*
3954  * Unless it's a dead_end child, assign it a child slot number
3955  */
3956  if (!bn->dead_end)
3958  else
3959  bn->child_slot = 0;
3960 
3961  /* Hasn't asked to be notified about any bgworkers yet */
3962  bn->bgworker_notify = false;
3963 
3964 #ifdef EXEC_BACKEND
3965  pid = backend_forkexec(port);
3966 #else /* !EXEC_BACKEND */
3967  pid = fork_process();
3968  if (pid == 0) /* child */
3969  {
3970  free(bn);
3971 
3972  /* Detangle from postmaster */
3974 
3975  /* Close the postmaster's sockets */
3976  ClosePostmasterPorts(false);
3977 
3978  /* Perform additional initialization and collect startup packet */
3979  BackendInitialize(port);
3980 
3981  /* And run the backend */
3982  BackendRun(port);
3983  }
3984 #endif /* EXEC_BACKEND */
3985 
3986  if (pid < 0)
3987  {
3988  /* in parent, fork failed */
3989  int save_errno = errno;
3990 
3991  if (!bn->dead_end)
3993  free(bn);
3994  errno = save_errno;
3995  ereport(LOG,
3996  (errmsg("could not fork new process for connection: %m")));
3997  report_fork_failure_to_client(port, save_errno);
3998  return STATUS_ERROR;
3999  }
4000 
4001  /* in parent, successful fork */
4002  ereport(DEBUG2,
4003  (errmsg_internal("forked new backend, pid=%d socket=%d",
4004  (int) pid, (int) port->sock)));
4005 
4006  /*
4007  * Everything's been successful, it's safe to add this backend to our list
4008  * of backends.
4009  */
4010  bn->pid = pid;
4011  bn->bkend_type = BACKEND_TYPE_NORMAL; /* Can change later to WALSND */
4013 
4014 #ifdef EXEC_BACKEND
4015  if (!bn->dead_end)
4016  ShmemBackendArrayAdd(bn);
4017 #endif
4018 
4019  return STATUS_OK;
4020 }
CAC_state canAcceptConnections
Definition: libpq-be.h:131
void InitPostmasterChild(void)
Definition: miscinit.c:175
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
static void BackendRun(Port *port) pg_attribute_noreturn()
Definition: postmaster.c:4244
pid_t fork_process(void)
Definition: fork_process.c:31
int errcode(int sqlerrcode)
Definition: elog.c:575
#define STATUS_ERROR
Definition: c.h:971
bool ReleasePostmasterChildSlot(int slot)
Definition: pmsignal.c:185
#define BACKEND_TYPE_NORMAL
Definition: postmaster.c:142
#define LOG
Definition: elog.h:26
dlist_node elem
Definition: postmaster.c:180
void ClosePostmasterPorts(bool am_syslogger)
Definition: postmaster.c:2414
pgsocket sock
Definition: libpq-be.h:120
bool bgworker_notify
Definition: postmaster.c:179
int AssignPostmasterChildSlot(void)
Definition: pmsignal.c:151
#define malloc(a)
Definition: header.h:45
int32 MyCancelKey
Definition: globals.c:41
static dlist_head BackendList
Definition: postmaster.c:183
#define DEBUG2
Definition: elog.h:24
static void report_fork_failure_to_client(Port *port, int errnum)
Definition: postmaster.c:4031
int32 cancel_key
Definition: postmaster.c:169
bool dead_end
Definition: postmaster.c:178
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:970
static bool RandomCancelKey(int32 *cancel_key)
Definition: postmaster.c:5123
int child_slot
Definition: postmaster.c:170
int bkend_type
Definition: postmaster.c:177
#define free(a)
Definition: header.h:60
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
pid_t pid
Definition: postmaster.c:168
int MyPMChildSlot
Definition: globals.c:42
int errmsg(const char *fmt,...)
Definition: elog.c:797
static CAC_state canAcceptConnections(void)
Definition: postmaster.c:2292
static void BackendInitialize(Port *port)
Definition: postmaster.c:4064
void BackgroundWorkerBlockSignals ( void  )

Definition at line 5491 of file postmaster.c.

References BlockSig, and PG_SETMASK.

5492 {
5493  PG_SETMASK(&BlockSig);
5494 }
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
sigset_t BlockSig
Definition: pqsignal.c:22
void BackgroundWorkerInitializeConnection ( char *  dbname,
char *  username 
)

Definition at line 5445 of file postmaster.c.

References BackgroundWorker::bgw_flags, BGWORKER_BACKEND_DATABASE_CONNECTION, ereport, errcode(), errmsg(), ERROR, FATAL, InitPostgres(), InvalidOid, IsInitProcessingMode, MyBgworkerEntry, NormalProcessing, NULL, and SetProcessingMode.

Referenced by ApplyLauncherMain().

5446 {
5448 
5449  /* XXX is this the right errcode? */
5451  ereport(FATAL,
5452  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
5453  errmsg("database connection requirement not indicated during registration")));
5454 
5456 
5457  /* it had better not gotten out of "init" mode yet */
5458  if (!IsInitProcessingMode())
5459  ereport(ERROR,
5460  (errmsg("invalid processing mode in background worker")));
5462 }
int errcode(int sqlerrcode)
Definition: elog.c:575
#define SetProcessingMode(mode)
Definition: miscadmin.h:371
BackgroundWorker * MyBgworkerEntry
Definition: postmaster.c:189
#define ERROR
Definition: elog.h:43
#define FATAL
Definition: elog.h:52
#define ereport(elevel, rest)
Definition: elog.h:122
static char * username
Definition: initdb.c:130
#define InvalidOid
Definition: postgres_ext.h:36
#define NULL
Definition: c.h:226
#define BGWORKER_BACKEND_DATABASE_CONNECTION
Definition: bgworker.h:59
char * dbname
Definition: streamutil.c:41
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname)
Definition: postinit.c:558
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define IsInitProcessingMode()
Definition: miscadmin.h:366
void BackgroundWorkerInitializeConnectionByOid ( Oid  dboid,
Oid  useroid 
)

Definition at line 5468 of file postmaster.c.

References BackgroundWorker::bgw_flags, BGWORKER_BACKEND_DATABASE_CONNECTION, ereport, errcode(), errmsg(), ERROR, FATAL, InitPostgres(), IsInitProcessingMode, MyBgworkerEntry, NormalProcessing, NULL, and SetProcessingMode.

Referenced by ApplyWorkerMain(), and ParallelWorkerMain().

5469 {
5471 
5472  /* XXX is this the right errcode? */
5474  ereport(FATAL,
5475  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
5476  errmsg("database connection requirement not indicated during registration")));
5477 
5478  InitPostgres(NULL, dboid, NULL, useroid, NULL);
5479 
5480  /* it had better not gotten out of "init" mode yet */
5481  if (!IsInitProcessingMode())
5482  ereport(ERROR,
5483  (errmsg("invalid processing mode in background worker")));
5485 }
int errcode(int sqlerrcode)
Definition: elog.c:575
#define SetProcessingMode(mode)
Definition: miscadmin.h:371
BackgroundWorker * MyBgworkerEntry
Definition: postmaster.c:189
#define ERROR
Definition: elog.h:43
#define FATAL
Definition: elog.h:52
#define ereport(elevel, rest)
Definition: elog.h:122
#define NULL
Definition: c.h:226
#define BGWORKER_BACKEND_DATABASE_CONNECTION
Definition: bgworker.h:59
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname)
Definition: postinit.c:558
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define IsInitProcessingMode()
Definition: miscadmin.h:366
void BackgroundWorkerUnblockSignals ( void  )

Definition at line 5497 of file postmaster.c.

References PG_SETMASK, and UnBlockSig.

Referenced by ApplyLauncherMain(), ApplyWorkerMain(), ParallelWorkerMain(), and test_shm_mq_main().

5498 {
5500 }
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
sigset_t UnBlockSig
Definition: pqsignal.c:22
static bool bgworker_should_start_now ( BgWorkerStartTime  start_time)
static

Definition at line 5586 of file postmaster.c.

References BgWorkerStart_ConsistentState, BgWorkerStart_PostmasterStart, BgWorkerStart_RecoveryFinished, PM_HOT_STANDBY, PM_INIT, PM_NO_CHILDREN, PM_RECOVERY, PM_RUN, PM_SHUTDOWN, PM_SHUTDOWN_2, PM_STARTUP, PM_WAIT_BACKENDS, PM_WAIT_BACKUP, PM_WAIT_DEAD_END, PM_WAIT_READONLY, and pmState.

Referenced by maybe_start_bgworker().

5587 {
5588  switch (pmState)
5589  {
5590  case PM_NO_CHILDREN:
5591  case PM_WAIT_DEAD_END:
5592  case PM_SHUTDOWN_2:
5593  case PM_SHUTDOWN:
5594  case PM_WAIT_BACKENDS:
5595  case PM_WAIT_READONLY:
5596  case PM_WAIT_BACKUP:
5597  break;
5598 
5599  case PM_RUN:
5601  return true;
5602  /* fall through */
5603 
5604  case PM_HOT_STANDBY:
5606  return true;
5607  /* fall through */
5608 
5609  case PM_RECOVERY:
5610  case PM_STARTUP:
5611  case PM_INIT:
5613  return true;
5614  /* fall through */
5615 
5616  }
5617 
5618  return false;
5619 }
static time_t start_time
Definition: pg_ctl.c:94
static PMState pmState
Definition: postmaster.c:338
static CAC_state canAcceptConnections ( void  )
static

Definition at line 2292 of file postmaster.c.

References BACKEND_TYPE_ALL, CAC_OK, CAC_RECOVERY, CAC_SHUTDOWN, CAC_STARTUP, CAC_TOOMANY, CAC_WAITBACKUP, CountChildren(), FatalError, MaxLivePostmasterChildren(), NoShutdown, PM_HOT_STANDBY, PM_RECOVERY, PM_RUN, PM_STARTUP, PM_WAIT_BACKUP, pmState, and Shutdown.

Referenced by BackendStartup(), and StartAutovacuumWorker().

2293 {
2294  CAC_state result = CAC_OK;
2295 
2296  /*
2297  * Can't start backends when in startup/shutdown/inconsistent recovery
2298  * state.
2299  *
2300  * In state PM_WAIT_BACKUP only superusers can connect (this must be
2301  * allowed so that a superuser can end online backup mode); we return
2302  * CAC_WAITBACKUP code to indicate that this must be checked later. Note
2303  * that neither CAC_OK nor CAC_WAITBACKUP can safely be returned until we
2304  * have checked for too many children.
2305  */
2306  if (pmState != PM_RUN)
2307  {
2308  if (pmState == PM_WAIT_BACKUP)
2309  result = CAC_WAITBACKUP; /* allow superusers only */
2310  else if (Shutdown > NoShutdown)
2311  return CAC_SHUTDOWN; /* shutdown is pending */
2312  else if (!FatalError &&
2313  (pmState == PM_STARTUP ||
2314  pmState == PM_RECOVERY))
2315  return CAC_STARTUP; /* normal startup */
2316  else if (!FatalError &&
2318  result = CAC_OK; /* connection OK during hot standby */
2319  else
2320  return CAC_RECOVERY; /* else must be crash recovery */
2321  }
2322 
2323  /*
2324  * Don't start too many children.
2325  *
2326  * We allow more connections than we can have backends here because some
2327  * might still be authenticating; they might fail auth, or some existing
2328  * backend might exit before the auth cycle is completed. The exact
2329  * MaxBackends limit is enforced when a new backend tries to join the
2330  * shared-inval backend array.
2331  *
2332  * The limit here must match the sizes of the per-child-process arrays;
2333  * see comments for MaxLivePostmasterChildren().
2334  */
2336  result = CAC_TOOMANY;
2337 
2338  return result;
2339 }
#define BACKEND_TYPE_ALL
Definition: postmaster.c:146
static bool FatalError
Definition: postmaster.c:276
static int Shutdown
Definition: postmaster.c:274
static int CountChildren(int target)
Definition: postmaster.c:5163
static PMState pmState
Definition: postmaster.c:338
int MaxLivePostmasterChildren(void)
Definition: postmaster.c:5435
#define NoShutdown
Definition: postmaster.c:269
CAC_state
Definition: libpq-be.h:73
static void checkDataDir ( void  )
static

Definition at line 1444 of file postmaster.c.

References AllocateFile(), Assert, DataDir, ereport, errcode(), errcode_for_file_access(), errdetail(), errhint(), errmsg(), ExitPostmaster(), FATAL, FreeFile(), MAXPGPATH, NULL, PG_BINARY_R, progname, S_IRWXG, S_IRWXO, snprintf(), strerror(), ValidatePgVersion(), and write_stderr.

Referenced by PostmasterMain().

1445 {
1446  char path[MAXPGPATH];
1447  FILE *fp;
1448  struct stat stat_buf;
1449 
1450  Assert(DataDir);
1451 
1452  if (stat(DataDir, &stat_buf) != 0)
1453  {
1454  if (errno == ENOENT)
1455  ereport(FATAL,
1457  errmsg("data directory \"%s\" does not exist",
1458  DataDir)));
1459  else
1460  ereport(FATAL,
1462  errmsg("could not read permissions of directory \"%s\": %m",
1463  DataDir)));
1464  }
1465 
1466  /* eventual chdir would fail anyway, but let's test ... */
1467  if (!S_ISDIR(stat_buf.st_mode))
1468  ereport(FATAL,
1469  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1470  errmsg("specified data directory \"%s\" is not a directory",
1471  DataDir)));
1472 
1473  /*
1474  * Check that the directory belongs to my userid; if not, reject.
1475  *
1476  * This check is an essential part of the interlock that prevents two
1477  * postmasters from starting in the same directory (see CreateLockFile()).
1478  * Do not remove or weaken it.
1479  *
1480  * XXX can we safely enable this check on Windows?
1481  */
1482 #if !defined(WIN32) && !defined(__CYGWIN__)
1483  if (stat_buf.st_uid != geteuid())
1484  ereport(FATAL,
1485  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1486  errmsg("data directory \"%s\" has wrong ownership",
1487  DataDir),
1488  errhint("The server must be started by the user that owns the data directory.")));
1489 #endif
1490 
1491  /*
1492  * Check if the directory has group or world access. If so, reject.
1493  *
1494  * It would be possible to allow weaker constraints (for example, allow
1495  * group access) but we cannot make a general assumption that that is
1496  * okay; for example there are platforms where nearly all users
1497  * customarily belong to the same group. Perhaps this test should be
1498  * configurable.
1499  *
1500  * XXX temporarily suppress check when on Windows, because there may not
1501  * be proper support for Unix-y file permissions. Need to think of a
1502  * reasonable check to apply on Windows.
1503  */
1504 #if !defined(WIN32) && !defined(__CYGWIN__)
1505  if (stat_buf.st_mode & (S_IRWXG | S_IRWXO))
1506  ereport(FATAL,
1507  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1508  errmsg("data directory \"%s\" has group or world access",
1509  DataDir),
1510  errdetail("Permissions should be u=rwx (0700).")));
1511 #endif
1512 
1513  /* Look for PG_VERSION before looking for pg_control */
1515 
1516  snprintf(path, sizeof(path), "%s/global/pg_control", DataDir);
1517 
1518  fp = AllocateFile(path, PG_BINARY_R);
1519  if (fp == NULL)
1520  {
1521  write_stderr("%s: could not find the database system\n"
1522  "Expected to find it in the directory \"%s\",\n"
1523  "but could not open file \"%s\": %s\n",
1524  progname, DataDir, path, strerror(errno));
1525  ExitPostmaster(2);
1526  }
1527  FreeFile(fp);
1528 }
int errhint(const char *fmt,...)
Definition: elog.c:987
void ValidatePgVersion(const char *path)
Definition: miscinit.c:1333
#define write_stderr(str)
Definition: parallel.c:182
int errcode(int sqlerrcode)
Definition: elog.c:575
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
const char * progname
Definition: pg_standby.c:37
#define PG_BINARY_R
Definition: c.h:1039
struct stat stat_buf
Definition: pg_standby.c:101
static void ExitPostmaster(int status) pg_attribute_noreturn()
Definition: postmaster.c:4903
#define FATAL
Definition: elog.h:52
#define MAXPGPATH
int errdetail(const char *fmt,...)
Definition: elog.c:873
int errcode_for_file_access(void)
Definition: elog.c:598
FILE * AllocateFile(const char *name, const char *mode)
Definition: fd.c:1966
#define ereport(elevel, rest)
Definition: elog.h:122
#define S_IRWXO
Definition: win32.h:484
#define NULL
Definition: c.h:226
#define Assert(condition)
Definition: c.h:670
#define S_IRWXG
Definition: win32.h:480
int FreeFile(FILE *file)
Definition: fd.c:2149
int errmsg(const char *fmt,...)
Definition: elog.c:797
const char * strerror(int errnum)
Definition: strerror.c:19
char * DataDir
Definition: globals.c:59
static void CleanupBackend ( int  pid,
int  exitstatus 
)
static

Definition at line 3148 of file postmaster.c.

References _, BackgroundWorkerStopNotifications(), bkend::bgworker_notify, bkend::child_slot, dlist_mutable_iter::cur, bkend::dead_end, DEBUG2, dlist_container, dlist_delete(), dlist_foreach_modify, EXIT_STATUS_0, EXIT_STATUS_1, free, HandleChildCrash(), LOG, LogChildExit(), bkend::pid, and ReleasePostmasterChildSlot().

Referenced by reaper().

3150 {
3151  dlist_mutable_iter iter;
3152 
3153  LogChildExit(DEBUG2, _("server process"), pid, exitstatus);
3154 
3155  /*
3156  * If a backend dies in an ugly way then we must signal all other backends
3157  * to quickdie. If exit status is zero (normal) or one (FATAL exit), we
3158  * assume everything is all right and proceed to remove the backend from
3159  * the active backend list.
3160  */
3161 
3162 #ifdef WIN32
3163 
3164  /*
3165  * On win32, also treat ERROR_WAIT_NO_CHILDREN (128) as nonfatal case,
3166  * since that sometimes happens under load when the process fails to start
3167  * properly (long before it starts using shared memory). Microsoft reports
3168  * it is related to mutex failure:
3169  * http://archives.postgresql.org/pgsql-hackers/2010-09/msg00790.php
3170  */
3171  if (exitstatus == ERROR_WAIT_NO_CHILDREN)
3172  {
3173  LogChildExit(LOG, _("server process"), pid, exitstatus);
3174  exitstatus = 0;
3175  }
3176 #endif
3177 
3178  if (!EXIT_STATUS_0(exitstatus) && !EXIT_STATUS_1(exitstatus))
3179  {
3180  HandleChildCrash(pid, exitstatus, _("server process"));
3181  return;
3182  }
3183 
3185  {
3186  Backend *bp = dlist_container(Backend, elem, iter.cur);
3187 
3188  if (bp->pid == pid)
3189  {
3190  if (!bp->dead_end)
3191  {
3193  {
3194  /*
3195  * Uh-oh, the child failed to clean itself up. Treat as a
3196  * crash after all.
3197  */
3198  HandleChildCrash(pid, exitstatus, _("server process"));
3199  return;
3200  }
3201 #ifdef EXEC_BACKEND
3202  ShmemBackendArrayRemove(bp);
3203 #endif
3204  }
3205  if (bp->bgworker_notify)
3206  {
3207  /*
3208  * This backend may have been slated to receive SIGUSR1 when
3209  * some background worker started or stopped. Cancel those
3210  * notifications, as we don't want to signal PIDs that are not
3211  * PostgreSQL backends. This gets skipped in the (probably
3212  * very common) case where the backend has never requested any
3213  * such notifications.
3214  */
3216  }
3217  dlist_delete(iter.cur);
3218  free(bp);
3219  break;
3220  }
3221  }
3222 }
dlist_node * cur
Definition: ilist.h:180
#define dlist_foreach_modify(iter, lhead)
Definition: ilist.h:524
bool ReleasePostmasterChildSlot(int slot)
Definition: pmsignal.c:185
#define LOG
Definition: elog.h:26
void BackgroundWorkerStopNotifications(pid_t pid)
Definition: bgworker.c:438
bool bgworker_notify
Definition: postmaster.c:179
#define EXIT_STATUS_1(st)
Definition: postmaster.c:548
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
static dlist_head BackendList
Definition: postmaster.c:183
#define DEBUG2
Definition: elog.h:24
bool dead_end
Definition: postmaster.c:178
static void dlist_delete(dlist_node *node)
Definition: ilist.h:358
int child_slot
Definition: postmaster.c:170
#define free(a)
Definition: header.h:60
pid_t pid
Definition: postmaster.c:168
static void HandleChildCrash(int pid, int exitstatus, const char *procname)
Definition: postmaster.c:3232
static void LogChildExit(int lev, const char *procname, int pid, int exitstatus)
Definition: postmaster.c:3488
#define _(x)
Definition: elog.c:84
#define EXIT_STATUS_0(st)
Definition: postmaster.c:547
static bool CleanupBackgroundWorker ( int  pid,
int  exitstatus 
)
static

Definition at line 3049 of file postmaster.c.

References _, BackgroundWorkerList, BackgroundWorkerStopNotifications(), BackgroundWorker::bgw_flags, BackgroundWorker::bgw_name, bkend::bgworker_notify, BGWORKER_SHMEM_ACCESS, slist_iter::cur, DEBUG1, dlist_delete(), bkend::elem, EXIT_STATUS_0, EXIT_STATUS_1, free, GetCurrentTimestamp(), HandleChildCrash(), LOG, LogChildExit(), MAXPGPATH, NULL, ReleasePostmasterChildSlot(), ReportBackgroundWorkerPID(), RegisteredBgWorker::rw_backend, RegisteredBgWorker::rw_child_slot, RegisteredBgWorker::rw_crashed_at, RegisteredBgWorker::rw_pid, RegisteredBgWorker::rw_terminate, RegisteredBgWorker::rw_worker, slist_container, slist_foreach, and snprintf().

Referenced by reaper().

3051 {
3052  char namebuf[MAXPGPATH];
3053  slist_iter iter;
3054 
3056  {
3057  RegisteredBgWorker *rw;
3058 
3059  rw = slist_container(RegisteredBgWorker, rw_lnode, iter.cur);
3060 
3061  if (rw->rw_pid != pid)
3062  continue;
3063 
3064 #ifdef WIN32
3065  /* see CleanupBackend */
3066  if (exitstatus == ERROR_WAIT_NO_CHILDREN)
3067  exitstatus = 0;
3068 #endif
3069 
3070  snprintf(namebuf, MAXPGPATH, "%s: %s", _("worker process"),
3071  rw->rw_worker.bgw_name);
3072 
3073  if (!EXIT_STATUS_0(exitstatus))
3074  {
3075  /* Record timestamp, so we know when to restart the worker. */
3077  }
3078  else
3079  {
3080  /* Zero exit status means terminate */
3081  rw->rw_crashed_at = 0;
3082  rw->rw_terminate = true;
3083  }
3084 
3085  /*
3086  * Additionally, for shared-memory-connected workers, just like a
3087  * backend, any exit status other than 0 or 1 is considered a crash
3088  * and causes a system-wide restart.
3089  */
3090  if ((rw->rw_worker.bgw_flags & BGWORKER_SHMEM_ACCESS) != 0)
3091  {
3092  if (!EXIT_STATUS_0(exitstatus) && !EXIT_STATUS_1(exitstatus))
3093  {
3094  HandleChildCrash(pid, exitstatus, namebuf);
3095  return true;
3096  }
3097  }
3098 
3099  /*
3100  * We must release the postmaster child slot whether this worker is
3101  * connected to shared memory or not, but we only treat it as a crash
3102  * if it is in fact connected.
3103  */
3106  {
3107  HandleChildCrash(pid, exitstatus, namebuf);
3108  return true;
3109  }
3110 
3111  /* Get it out of the BackendList and clear out remaining data */
3112  dlist_delete(&rw->rw_backend->elem);
3113 #ifdef EXEC_BACKEND
3114  ShmemBackendArrayRemove(rw->rw_backend);
3115 #endif
3116 
3117  /*
3118  * It's possible that this background worker started some OTHER
3119  * background worker and asked to be notified when that worker started
3120  * or stopped. If so, cancel any notifications destined for the
3121  * now-dead backend.
3122  */
3123  if (rw->rw_backend->bgworker_notify)
3125  free(rw->rw_backend);
3126  rw->rw_backend = NULL;
3127  rw->rw_pid = 0;
3128  rw->rw_child_slot = 0;
3129  ReportBackgroundWorkerPID(rw); /* report child death */
3130 
3131  LogChildExit(EXIT_STATUS_0(exitstatus) ? DEBUG1 : LOG,
3132  namebuf, pid, exitstatus);
3133 
3134  return true;
3135  }
3136 
3137  return false;
3138 }
struct bkend * rw_backend
#define DEBUG1
Definition: elog.h:25
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1688
slist_node * cur
Definition: ilist.h:226
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
bool ReleasePostmasterChildSlot(int slot)
Definition: pmsignal.c:185
#define LOG
Definition: elog.h:26
dlist_node elem
Definition: postmaster.c:180
#define BGWORKER_SHMEM_ACCESS
Definition: bgworker.h:52
void BackgroundWorkerStopNotifications(pid_t pid)
Definition: bgworker.c:438
bool bgworker_notify
Definition: postmaster.c:179
#define EXIT_STATUS_1(st)
Definition: postmaster.c:548
void ReportBackgroundWorkerPID(RegisteredBgWorker *rw)
Definition: bgworker.c:420
#define MAXPGPATH
slist_head BackgroundWorkerList
Definition: bgworker.c:41
static void dlist_delete(dlist_node *node)
Definition: ilist.h:358
#define slist_container(type, membername, ptr)
Definition: ilist.h:674
#define free(a)
Definition: header.h:60
#define NULL
Definition: c.h:226
char bgw_name[BGW_MAXLEN]
Definition: bgworker.h:90
static void HandleChildCrash(int pid, int exitstatus, const char *procname)
Definition: postmaster.c:3232
#define slist_foreach(iter, lhead)
Definition: ilist.h:700
static void LogChildExit(int lev, const char *procname, int pid, int exitstatus)
Definition: postmaster.c:3488
BackgroundWorker rw_worker
#define _(x)
Definition: elog.c:84
#define EXIT_STATUS_0(st)
Definition: postmaster.c:547
void ClosePostmasterPorts ( bool  am_syslogger)

Definition at line 2414 of file postmaster.c.

References close, ereport, errcode_for_file_access(), errmsg_internal(), FATAL, i, ListenSocket, MAXLISTEN, PGINVALID_SOCKET, postmaster_alive_fds, POSTMASTER_FD_OWN, StreamClose(), and syslogPipe.

Referenced by BackendStartup(), do_start_bgworker(), pgarch_start(), pgstat_start(), StartAutoVacLauncher(), StartAutoVacWorker(), StartChildProcess(), and SysLogger_Start().

2415 {
2416  int i;
2417 
2418 #ifndef WIN32
2419 
2420  /*
2421  * Close the write end of postmaster death watch pipe. It's important to
2422  * do this as early as possible, so that if postmaster dies, others won't
2423  * think that it's still running because we're holding the pipe open.
2424  */
2426  ereport(FATAL,
2428  errmsg_internal("could not close postmaster death monitoring pipe in child process: %m")));
2430 #endif
2431 
2432  /* Close the listen sockets */
2433  for (i = 0; i < MAXLISTEN; i++)
2434  {
2435  if (ListenSocket[i] != PGINVALID_SOCKET)
2436  {
2439  }
2440  }
2441 
2442  /* If using syslogger, close the read side of the pipe */
2443  if (!am_syslogger)
2444  {
2445 #ifndef WIN32
2446  if (syslogPipe[0] >= 0)
2447  close(syslogPipe[0]);
2448  syslogPipe[0] = -1;
2449 #else
2450  if (syslogPipe[0])
2451  CloseHandle(syslogPipe[0]);
2452  syslogPipe[0] = 0;
2453 #endif
2454  }
2455 
2456 #ifdef USE_BONJOUR
2457  /* If using Bonjour, close the connection to the mDNS daemon */
2458  if (bonjour_sdref)
2459  close(DNSServiceRefSockFD(bonjour_sdref));
2460 #endif
2461 }
void StreamClose(pgsocket sock)
Definition: pqcomm.c:791
#define FATAL
Definition: elog.h:52
bool am_syslogger
Definition: syslogger.c:74
#define POSTMASTER_FD_OWN
Definition: postmaster.h:44
int errcode_for_file_access(void)
Definition: elog.c:598
#define ereport(elevel, rest)
Definition: elog.h:122
int postmaster_alive_fds[2]
Definition: postmaster.c:556
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
#define PGINVALID_SOCKET
Definition: port.h:24
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
int i
#define close(a)
Definition: win32.h:17
#define MAXLISTEN
Definition: postmaster.c:214
int syslogPipe[2]
Definition: syslogger.c:112
static void CloseServerPorts ( int  status,
Datum  arg 
)
static

Definition at line 1345 of file postmaster.c.

References i, ListenSocket, MAXLISTEN, PGINVALID_SOCKET, RemoveSocketFiles(), and StreamClose().

Referenced by PostmasterMain().

1346 {
1347  int i;
1348 
1349  /*
1350  * First, explicitly close all the socket FDs. We used to just let this
1351  * happen implicitly at postmaster exit, but it's better to close them
1352  * before we remove the postmaster.pid lockfile; otherwise there's a race
1353  * condition if a new postmaster wants to re-use the TCP port number.
1354  */
1355  for (i = 0; i < MAXLISTEN; i++)
1356  {
1357  if (ListenSocket[i] != PGINVALID_SOCKET)
1358  {
1361  }
1362  }
1363 
1364  /*
1365  * Next, remove any filesystem entries for Unix sockets. To avoid race
1366  * conditions against incoming postmasters, this must happen after closing
1367  * the sockets and before removing lock files.
1368  */
1370 
1371  /*
1372  * We don't do anything about socket lock files here; those will be
1373  * removed in a later on_proc_exit callback.
1374  */
1375 }
void StreamClose(pgsocket sock)
Definition: pqcomm.c:791
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
#define PGINVALID_SOCKET
Definition: port.h:24
int i
void RemoveSocketFiles(void)
Definition: pqcomm.c:836
#define MAXLISTEN
Definition: postmaster.c:214
static Port * ConnCreate ( int  serverFd)
static

Definition at line 2348 of file postmaster.c.

References calloc, ConnFree(), ereport, errcode(), errmsg(), ExitPostmaster(), Port::gss, LOG, NULL, PGINVALID_SOCKET, port, Port::sock, STATUS_OK, StreamClose(), and StreamConnection().

Referenced by ServerLoop().

2349 {
2350  Port *port;
2351 
2352  if (!(port = (Port *) calloc(1, sizeof(Port))))
2353  {
2354  ereport(LOG,
2355  (errcode(ERRCODE_OUT_OF_MEMORY),
2356  errmsg("out of memory")));
2357  ExitPostmaster(1);
2358  }
2359 
2360  if (StreamConnection(serverFd, port) != STATUS_OK)
2361  {
2362  if (port->sock != PGINVALID_SOCKET)
2363  StreamClose(port->sock);
2364  ConnFree(port);
2365  return NULL;
2366  }
2367 
2368  /*
2369  * Allocate GSSAPI specific state struct
2370  */
2371 #ifndef EXEC_BACKEND
2372 #if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
2373  port->gss = (pg_gssinfo *) calloc(1, sizeof(pg_gssinfo));
2374  if (!port->gss)
2375  {
2376  ereport(LOG,
2377  (errcode(ERRCODE_OUT_OF_MEMORY),
2378  errmsg("out of memory")));
2379  ExitPostmaster(1);
2380  }
2381 #endif
2382 #endif
2383 
2384  return port;
2385 }
#define calloc(a, b)
Definition: header.h:50
void StreamClose(pgsocket sock)
Definition: pqcomm.c:791
static void ConnFree(Port *port)
Definition: postmaster.c:2392
int errcode(int sqlerrcode)
Definition: elog.c:575
Definition: libpq-be.h:118
#define LOG
Definition: elog.h:26
int StreamConnection(pgsocket server_fd, Port *port)
Definition: pqcomm.c:663
pgsocket sock
Definition: libpq-be.h:120
static void ExitPostmaster(int status) pg_attribute_noreturn()
Definition: postmaster.c:4903
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:970
static int port
Definition: pg_regress.c:87
#define PGINVALID_SOCKET
Definition: port.h:24
#define NULL
Definition: c.h:226
void * gss
Definition: libpq-be.h:177
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void ConnFree ( Port port)
static

Definition at line 2392 of file postmaster.c.

References free, Port::gss, and secure_close().

Referenced by ConnCreate(), and ServerLoop().

2393 {
2394 #ifdef USE_SSL
2395  secure_close(conn);
2396 #endif
2397  if (conn->gss)
2398  free(conn->gss);
2399  free(conn);
2400 }
PGconn * conn
Definition: streamutil.c:45
#define free(a)
Definition: header.h:60
void secure_close(Port *port)
Definition: be-secure.c:125
static int CountChildren ( int  target)
static

Definition at line 5163 of file postmaster.c.

References BACKEND_TYPE_ALL, BACKEND_TYPE_NORMAL, BACKEND_TYPE_WALSND, bkend::bkend_type, bkend::child_slot, dlist_iter::cur, bkend::dead_end, dlist_container, dlist_foreach, and IsPostmasterChildWalSender().

Referenced by canAcceptConnections(), and PostmasterStateMachine().

5164 {
5165  dlist_iter iter;
5166  int cnt = 0;
5167 
5168  dlist_foreach(iter, &BackendList)
5169  {
5170  Backend *bp = dlist_container(Backend, elem, iter.cur);
5171 
5172  if (bp->dead_end)
5173  continue;
5174 
5175  /*
5176  * Since target == BACKEND_TYPE_ALL is the most common case, we test
5177  * it first and avoid touching shared memory for every child.
5178  */
5179  if (target != BACKEND_TYPE_ALL)
5180  {
5181  /*
5182  * Assign bkend_type for any recently announced WAL Sender
5183  * processes.
5184  */
5185  if (bp->bkend_type == BACKEND_TYPE_NORMAL &&
5188 
5189  if (!(target & bp->bkend_type))
5190  continue;
5191  }
5192 
5193  cnt++;
5194  }
5195  return cnt;
5196 }
#define BACKEND_TYPE_ALL
Definition: postmaster.c:146
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
#define BACKEND_TYPE_NORMAL
Definition: postmaster.c:142
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
static dlist_head BackendList
Definition: postmaster.c:183
#define BACKEND_TYPE_WALSND
Definition: postmaster.c:144
bool dead_end
Definition: postmaster.c:178
int child_slot
Definition: postmaster.c:170
int bkend_type
Definition: postmaster.c:177
dlist_node * cur
Definition: ilist.h:161
bool IsPostmasterChildWalSender(int slot)
Definition: pmsignal.c:207
static bool CreateOptsFile ( int  argc,
char *  argv[],
char *  fullprogname 
)
static

Definition at line 5395 of file postmaster.c.

References elog, i, LOG, NULL, and OPTS_FILE.

Referenced by PostmasterMain().

5396 {
5397  FILE *fp;
5398  int i;
5399 
5400 #define OPTS_FILE "postmaster.opts"
5401 
5402  if ((fp = fopen(OPTS_FILE, "w")) == NULL)
5403  {
5404  elog(LOG, "could not create file \"%s\": %m", OPTS_FILE);
5405  return false;
5406  }
5407 
5408  fprintf(fp, "%s", fullprogname);
5409  for (i = 1; i < argc; i++)
5410  fprintf(fp, " \"%s\"", argv[i]);
5411  fputs("\n", fp);
5412 
5413  if (fclose(fp))
5414  {
5415  elog(LOG, "could not write file \"%s\": %m", OPTS_FILE);
5416  return false;
5417  }
5418 
5419  return true;
5420 }
#define LOG
Definition: elog.h:26
#define NULL
Definition: c.h:226
int i
#define elog
Definition: elog.h:219
#define OPTS_FILE
static void DetermineSleepTime ( struct timeval *  timeout)
static

Definition at line 1540 of file postmaster.c.

References AbortStartTime, BackgroundWorkerList, BGW_NEVER_RESTART, BackgroundWorker::bgw_restart_time, slist_mutable_iter::cur, ForgetBackgroundWorker(), GetCurrentTimestamp(), HaveCrashedWorker, Max, NoShutdown, NULL, RegisteredBgWorker::rw_crashed_at, RegisteredBgWorker::rw_terminate, RegisteredBgWorker::rw_worker, Shutdown, SIGKILL_CHILDREN_AFTER_SECS, slist_container, slist_foreach_modify, StartWorkerNeeded, TimestampDifference(), and TimestampTzPlusMilliseconds.

Referenced by ServerLoop().

1541 {
1542  TimestampTz next_wakeup = 0;
1543 
1544  /*
1545  * Normal case: either there are no background workers at all, or we're in
1546  * a shutdown sequence (during which we ignore bgworkers altogether).
1547  */
1548  if (Shutdown > NoShutdown ||
1550  {
1551  if (AbortStartTime != 0)
1552  {
1553  /* time left to abort; clamp to 0 in case it already expired */
1554  timeout->tv_sec = SIGKILL_CHILDREN_AFTER_SECS -
1555  (time(NULL) - AbortStartTime);
1556  timeout->tv_sec = Max(timeout->tv_sec, 0);
1557  timeout->tv_usec = 0;
1558  }
1559  else
1560  {
1561  timeout->tv_sec = 60;
1562  timeout->tv_usec = 0;
1563  }
1564  return;
1565  }
1566 
1567  if (StartWorkerNeeded)
1568  {
1569  timeout->tv_sec = 0;
1570  timeout->tv_usec = 0;
1571  return;
1572  }
1573 
1574  if (HaveCrashedWorker)
1575  {
1576  slist_mutable_iter siter;
1577 
1578  /*
1579  * When there are crashed bgworkers, we sleep just long enough that
1580  * they are restarted when they request to be. Scan the list to
1581  * determine the minimum of all wakeup times according to most recent
1582  * crash time and requested restart interval.
1583  */
1585  {
1586  RegisteredBgWorker *rw;
1587  TimestampTz this_wakeup;
1588 
1589  rw = slist_container(RegisteredBgWorker, rw_lnode, siter.cur);
1590 
1591  if (rw->rw_crashed_at == 0)
1592  continue;
1593 
1595  || rw->rw_terminate)
1596  {
1597  ForgetBackgroundWorker(&siter);
1598  continue;
1599  }
1600 
1601  this_wakeup = TimestampTzPlusMilliseconds(rw->rw_crashed_at,
1602  1000L * rw->rw_worker.bgw_restart_time);
1603  if (next_wakeup == 0 || this_wakeup < next_wakeup)
1604  next_wakeup = this_wakeup;
1605  }
1606  }
1607 
1608  if (next_wakeup != 0)
1609  {
1610  long secs;
1611  int microsecs;
1612 
1614  &secs, &microsecs);
1615  timeout->tv_sec = secs;
1616  timeout->tv_usec = microsecs;
1617 
1618  /* Ensure we don't exceed one minute */
1619  if (timeout->tv_sec > 60)
1620  {
1621  timeout->tv_sec = 60;
1622  timeout->tv_usec = 0;
1623  }
1624  }
1625  else
1626  {
1627  timeout->tv_sec = 60;
1628  timeout->tv_usec = 0;
1629  }
1630 }
static volatile bool StartWorkerNeeded
Definition: postmaster.c:360
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1688
slist_node * cur
Definition: ilist.h:241
int bgw_restart_time
Definition: bgworker.h:93
static volatile bool HaveCrashedWorker
Definition: postmaster.c:361
#define slist_foreach_modify(iter, lhead)
Definition: ilist.h:716
static int Shutdown
Definition: postmaster.c:274
double TimestampTz
Definition: timestamp.h:51
slist_head BackgroundWorkerList
Definition: bgworker.c:41
void ForgetBackgroundWorker(slist_mutable_iter *cur)
Definition: bgworker.c:392
#define BGW_NEVER_RESTART
Definition: bgworker.h:84
#define slist_container(type, membername, ptr)
Definition: ilist.h:674
#define TimestampTzPlusMilliseconds(tz, ms)
Definition: timestamp.h:80
#define SIGKILL_CHILDREN_AFTER_SECS
Definition: postmaster.c:344
#define Max(x, y)
Definition: c.h:795
#define NULL
Definition: c.h:226
#define NoShutdown
Definition: postmaster.c:269
BackgroundWorker rw_worker
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1791
static time_t AbortStartTime
Definition: postmaster.c:342
static void do_start_bgworker ( RegisteredBgWorker rw)
static

Definition at line 5530 of file postmaster.c.

References BackgroundWorker::bgw_name, ClosePostmasterPorts(), DEBUG1, ereport, errmsg(), fork_process(), InitPostmasterChild(), LOG, MemoryContextAlloc(), MemoryContextDelete(), MemoryContextSwitchTo(), NULL, bkend::pid, PostmasterContext, ReportBackgroundWorkerPID(), RegisteredBgWorker::rw_backend, RegisteredBgWorker::rw_pid, RegisteredBgWorker::rw_shmem_slot, RegisteredBgWorker::rw_worker, StartBackgroundWorker(), and TopMemoryContext.

Referenced by maybe_start_bgworker().

5531 {
5532  pid_t worker_pid;
5533 
5534  ereport(DEBUG1,
5535  (errmsg("starting background worker process \"%s\"",
5536  rw->rw_worker.bgw_name)));
5537 
5538 #ifdef EXEC_BACKEND
5539  switch ((worker_pid = bgworker_forkexec(rw->rw_shmem_slot)))
5540 #else
5541  switch ((worker_pid = fork_process()))
5542 #endif
5543  {
5544  case -1:
5545  ereport(LOG,
5546  (errmsg("could not fork worker process: %m")));
5547  return;
5548 
5549 #ifndef EXEC_BACKEND
5550  case 0:
5551  /* in postmaster child ... */
5553 
5554  /* Close the postmaster's sockets */
5555  ClosePostmasterPorts(false);
5556 
5557  /*
5558  * Before blowing away PostmasterContext, save this bgworker's
5559  * data where it can find it.
5560  */
5563  memcpy(MyBgworkerEntry, &rw->rw_worker, sizeof(BackgroundWorker));
5564 
5565  /* Release postmaster's working memory context */
5569 
5571  break;
5572 #endif
5573  default:
5574  rw->rw_pid = worker_pid;
5575  rw->rw_backend->pid = rw->rw_pid;
5577  break;
5578  }
5579 }
struct bkend * rw_backend
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:200
#define DEBUG1
Definition: elog.h:25
void InitPostmasterChild(void)
Definition: miscinit.c:175
pid_t fork_process(void)
Definition: fork_process.c:31
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
BackgroundWorker * MyBgworkerEntry
Definition: postmaster.c:189
#define LOG
Definition: elog.h:26
void ClosePostmasterPorts(bool am_syslogger)
Definition: postmaster.c:2414
void StartBackgroundWorker(void)
Definition: bgworker.c:611
void ReportBackgroundWorkerPID(RegisteredBgWorker *rw)
Definition: bgworker.c:420
#define ereport(elevel, rest)
Definition: elog.h:122
MemoryContext TopMemoryContext
Definition: mcxt.c:43
#define NULL
Definition: c.h:226
char bgw_name[BGW_MAXLEN]
Definition: bgworker.h:90
pid_t pid
Definition: postmaster.c:168
int errmsg(const char *fmt,...)
Definition: elog.c:797
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:749
BackgroundWorker rw_worker
MemoryContext PostmasterContext
Definition: mcxt.c:45
static void dummy_handler ( SIGNAL_ARGS  )
static

Definition at line 5104 of file postmaster.c.

Referenced by PostmasterMain().

5105 {
5106 }
static void ExitPostmaster ( int  status)
static

Definition at line 4903 of file postmaster.c.

References ereport, errcode(), errdetail(), errmsg_internal(), LOG, and proc_exit().

Referenced by checkDataDir(), ConnCreate(), PostmasterMain(), PostmasterStateMachine(), reaper(), and StartChildProcess().

4904 {
4905 #ifdef HAVE_PTHREAD_IS_THREADED_NP
4906 
4907  /*
4908  * There is no known cause for a postmaster to become multithreaded after
4909  * startup. Recheck to account for the possibility of unknown causes.
4910  * This message uses LOG level, because an unclean shutdown at this point
4911  * would usually not look much different from a clean shutdown.
4912  */
4913  if (pthread_is_threaded_np() != 0)
4914  ereport(LOG,
4915  (errcode(ERRCODE_INTERNAL_ERROR),
4916  errmsg_internal("postmaster became multithreaded"),
4917  errdetail("Please report this to <pgsql-bugs@postgresql.org>.")));
4918 #endif
4919 
4920  /* should cleanup shared memory and kill all backends */
4921 
4922  /*
4923  * Not sure of the semantics here. When the Postmaster dies, should the
4924  * backends all be killed? probably not.
4925  *
4926  * MUST -- vadim 05-10-1999
4927  */
4928 
4929  proc_exit(status);
4930 }
void proc_exit(int code)
Definition: ipc.c:99
int errcode(int sqlerrcode)
Definition: elog.c:575
#define LOG
Definition: elog.h:26
int errdetail(const char *fmt,...)
Definition: elog.c:873
#define ereport(elevel, rest)
Definition: elog.h:122
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:222
static void getInstallationPaths ( const char *  argv0)
static

Definition at line 1393 of file postmaster.c.

References AllocateDir(), elog, ereport, errcode_for_file_access(), errhint(), errmsg(), ERROR, FATAL, find_my_exec(), find_other_exec(), FreeDir(), get_pkglib_path(), my_exec_path, NULL, PG_BACKEND_VERSIONSTR, and pkglib_path.

Referenced by PostmasterMain().

1394 {
1395  DIR *pdir;
1396 
1397  /* Locate the postgres executable itself */
1398  if (find_my_exec(argv0, my_exec_path) < 0)
1399  elog(FATAL, "%s: could not locate my own executable path", argv0);
1400 
1401 #ifdef EXEC_BACKEND
1402  /* Locate executable backend before we change working directory */
1403  if (find_other_exec(argv0, "postgres", PG_BACKEND_VERSIONSTR,
1404  postgres_exec_path) < 0)
1405  ereport(FATAL,
1406  (errmsg("%s: could not locate matching postgres executable",
1407  argv0)));
1408 #endif
1409 
1410  /*
1411  * Locate the pkglib directory --- this has to be set early in case we try
1412  * to load any modules from it in response to postgresql.conf entries.
1413  */
1415 
1416  /*
1417  * Verify that there's a readable directory there; otherwise the Postgres
1418  * installation is incomplete or corrupt. (A typical cause of this
1419  * failure is that the postgres executable has been moved or hardlinked to
1420  * some directory that's not a sibling of the installation lib/
1421  * directory.)
1422  */
1423  pdir = AllocateDir(pkglib_path);
1424  if (pdir == NULL)
1425  ereport(ERROR,
1427  errmsg("could not open directory \"%s\": %m",
1428  pkglib_path),
1429  errhint("This may indicate an incomplete PostgreSQL installation, or that the file \"%s\" has been moved away from its proper location.",
1430  my_exec_path)));
1431  FreeDir(pdir);
1432 
1433  /*
1434  * XXX is it worth similarly checking the share/ directory? If the lib/
1435  * directory is there, then share/ probably is too.
1436  */
1437 }
int find_other_exec(const char *argv0, const char *target, const char *versionstr, char *retpath)
Definition: exec.c:307
static char * argv0
Definition: pg_ctl.c:92
int errhint(const char *fmt,...)
Definition: elog.c:987
#define PG_BACKEND_VERSIONSTR
Definition: miscadmin.h:29
void get_pkglib_path(const char *my_exec_path, char *ret_path)
Definition: path.c:758
Definition: dirent.c:25
#define ERROR
Definition: elog.h:43
#define FATAL
Definition: elog.h:52
int find_my_exec(const char *argv0, char *retpath)
Definition: exec.c:119
int errcode_for_file_access(void)
Definition: elog.c:598
DIR * AllocateDir(const char *dirname)
Definition: fd.c:2207
#define ereport(elevel, rest)
Definition: elog.h:122
char my_exec_path[MAXPGPATH]
Definition: globals.c:63
#define NULL
Definition: c.h:226
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define elog
Definition: elog.h:219
char pkglib_path[MAXPGPATH]
Definition: globals.c:64
int FreeDir(DIR *dir)
Definition: fd.c:2316
static void HandleChildCrash ( int  pid,
int  exitstatus,
const char *  procname 
)
static

Definition at line 3232 of file postmaster.c.

References AbortStartTime, allow_immediate_pgstat_restart(), AutoVacPID, BACKEND_TYPE_BGWORKER, BackgroundWorkerList, BgWriterPID, bkend::bkend_type, CheckpointerPID, bkend::child_slot, dlist_mutable_iter::cur, slist_iter::cur, bkend::dead_end, DEBUG2, dlist_container, dlist_delete(), dlist_foreach_modify, bkend::elem, ereport, errmsg(), errmsg_internal(), FatalError, free, ImmediateShutdown, LOG, LogChildExit(), NULL, PgArchPID, PgStatPID, bkend::pid, PM_HOT_STANDBY, PM_RECOVERY, PM_RUN, PM_SHUTDOWN, PM_WAIT_BACKENDS, PM_WAIT_BACKUP, PM_WAIT_READONLY, pmState, ReleasePostmasterChildSlot(), RegisteredBgWorker::rw_backend, RegisteredBgWorker::rw_child_slot, RegisteredBgWorker::rw_pid, SendStop, Shutdown, signal_child(), SIGQUIT, SIGSTOP, slist_container, slist_foreach, STARTUP_CRASHED, STARTUP_SIGNALED, StartupPID, StartupStatus, WalReceiverPID, and WalWriterPID.

Referenced by CleanupBackend(), CleanupBackgroundWorker(), and reaper().

3233 {
3234  dlist_mutable_iter iter;
3235  slist_iter siter;
3236  Backend *bp;
3237  bool take_action;
3238 
3239  /*
3240  * We only log messages and send signals if this is the first process
3241  * crash and we're not doing an immediate shutdown; otherwise, we're only
3242  * here to update postmaster's idea of live processes. If we have already
3243  * signalled children, nonzero exit status is to be expected, so don't
3244  * clutter log.
3245  */
3246  take_action = !FatalError && Shutdown != ImmediateShutdown;
3247 
3248  if (take_action)
3249  {
3250  LogChildExit(LOG, procname, pid, exitstatus);
3251  ereport(LOG,
3252  (errmsg("terminating any other active server processes")));
3253  }
3254 
3255  /* Process background workers. */
3257  {
3258  RegisteredBgWorker *rw;
3259 
3260  rw = slist_container(RegisteredBgWorker, rw_lnode, siter.cur);
3261  if (rw->rw_pid == 0)
3262  continue; /* not running */
3263  if (rw->rw_pid == pid)
3264  {
3265  /*
3266  * Found entry for freshly-dead worker, so remove it.
3267  */
3269  dlist_delete(&rw->rw_backend->elem);
3270 #ifdef EXEC_BACKEND
3271  ShmemBackendArrayRemove(rw->rw_backend);
3272 #endif
3273  free(rw->rw_backend);
3274  rw->rw_backend = NULL;
3275  rw->rw_pid = 0;
3276  rw->rw_child_slot = 0;
3277  /* don't reset crashed_at */
3278  /* don't report child stop, either */
3279  /* Keep looping so we can signal remaining workers */
3280  }
3281  else
3282  {
3283  /*
3284  * This worker is still alive. Unless we did so already, tell it
3285  * to commit hara-kiri.
3286  *
3287  * SIGQUIT is the special signal that says exit without proc_exit
3288  * and let the user know what's going on. But if SendStop is set
3289  * (-s on command line), then we send SIGSTOP instead, so that we
3290  * can get core dumps from all backends by hand.
3291  */
3292  if (take_action)
3293  {
3294  ereport(DEBUG2,
3295  (errmsg_internal("sending %s to process %d",
3296  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3297  (int) rw->rw_pid)));
3299  }
3300  }
3301  }
3302 
3303  /* Process regular backends */
3305  {
3306  bp = dlist_container(Backend, elem, iter.cur);
3307 
3308  if (bp->pid == pid)
3309  {
3310  /*
3311  * Found entry for freshly-dead backend, so remove it.
3312  */
3313  if (!bp->dead_end)
3314  {
3316 #ifdef EXEC_BACKEND
3317  ShmemBackendArrayRemove(bp);
3318 #endif
3319  }
3320  dlist_delete(iter.cur);
3321  free(bp);
3322  /* Keep looping so we can signal remaining backends */
3323  }
3324  else
3325  {
3326  /*
3327  * This backend is still alive. Unless we did so already, tell it
3328  * to commit hara-kiri.
3329  *
3330  * SIGQUIT is the special signal that says exit without proc_exit
3331  * and let the user know what's going on. But if SendStop is set
3332  * (-s on command line), then we send SIGSTOP instead, so that we
3333  * can get core dumps from all backends by hand.
3334  *
3335  * We could exclude dead_end children here, but at least in the
3336  * SIGSTOP case it seems better to include them.
3337  *
3338  * Background workers were already processed above; ignore them
3339  * here.
3340  */
3341  if (bp->bkend_type == BACKEND_TYPE_BGWORKER)
3342  continue;
3343 
3344  if (take_action)
3345  {
3346  ereport(DEBUG2,
3347  (errmsg_internal("sending %s to process %d",
3348  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3349  (int) bp->pid)));
3350  signal_child(bp->pid, (SendStop ? SIGSTOP : SIGQUIT));
3351  }
3352  }
3353  }
3354 
3355  /* Take care of the startup process too */
3356  if (pid == StartupPID)
3357  {
3358  StartupPID = 0;
3360  }
3361  else if (StartupPID != 0 && take_action)
3362  {
3363  ereport(DEBUG2,
3364  (errmsg_internal("sending %s to process %d",
3365  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3366  (int) StartupPID)));
3369  }
3370 
3371  /* Take care of the bgwriter too */
3372  if (pid == BgWriterPID)
3373  BgWriterPID = 0;
3374  else if (BgWriterPID != 0 && take_action)
3375  {
3376  ereport(DEBUG2,
3377  (errmsg_internal("sending %s to process %d",
3378  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3379  (int) BgWriterPID)));
3381  }
3382 
3383  /* Take care of the checkpointer too */
3384  if (pid == CheckpointerPID)
3385  CheckpointerPID = 0;
3386  else if (CheckpointerPID != 0 && take_action)
3387  {
3388  ereport(DEBUG2,
3389  (errmsg_internal("sending %s to process %d",
3390  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3391  (int) CheckpointerPID)));
3393  }
3394 
3395  /* Take care of the walwriter too */
3396  if (pid == WalWriterPID)
3397  WalWriterPID = 0;
3398  else if (WalWriterPID != 0 && take_action)
3399  {
3400  ereport(DEBUG2,
3401  (errmsg_internal("sending %s to process %d",
3402  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3403  (int) WalWriterPID)));
3405  }
3406 
3407  /* Take care of the walreceiver too */
3408  if (pid == WalReceiverPID)
3409  WalReceiverPID = 0;
3410  else if (WalReceiverPID != 0 && take_action)
3411  {
3412  ereport(DEBUG2,
3413  (errmsg_internal("sending %s to process %d",
3414  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3415  (int) WalReceiverPID)));
3417  }
3418 
3419  /* Take care of the autovacuum launcher too */
3420  if (pid == AutoVacPID)
3421  AutoVacPID = 0;
3422  else if (AutoVacPID != 0 && take_action)
3423  {
3424  ereport(DEBUG2,
3425  (errmsg_internal("sending %s to process %d",
3426  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3427  (int) AutoVacPID)));
3429  }
3430 
3431  /*
3432  * Force a power-cycle of the pgarch process too. (This isn't absolutely
3433  * necessary, but it seems like a good idea for robustness, and it
3434  * simplifies the state-machine logic in the case where a shutdown request
3435  * arrives during crash processing.)
3436  */
3437  if (PgArchPID != 0 && take_action)
3438  {
3439  ereport(DEBUG2,
3440  (errmsg_internal("sending %s to process %d",
3441  "SIGQUIT",
3442  (int) PgArchPID)));
3444  }
3445 
3446  /*
3447  * Force a power-cycle of the pgstat process too. (This isn't absolutely
3448  * necessary, but it seems like a good idea for robustness, and it
3449  * simplifies the state-machine logic in the case where a shutdown request
3450  * arrives during crash processing.)
3451  */
3452  if (PgStatPID != 0 && take_action)
3453  {
3454  ereport(DEBUG2,
3455  (errmsg_internal("sending %s to process %d",
3456  "SIGQUIT",
3457  (int) PgStatPID)));
3460  }
3461 
3462  /* We do NOT restart the syslogger */
3463 
3464  if (Shutdown != ImmediateShutdown)
3465  FatalError = true;
3466 
3467  /* We now transit into a state of waiting for children to die */
3468  if (pmState == PM_RECOVERY ||
3469  pmState == PM_HOT_STANDBY ||
3470  pmState == PM_RUN ||
3471  pmState == PM_WAIT_BACKUP ||
3473  pmState == PM_SHUTDOWN)
3475 
3476  /*
3477  * .. and if this doesn't happen quickly enough, now the clock is ticking
3478  * for us to kill them without mercy.
3479  */
3480  if (AbortStartTime == 0)
3481  AbortStartTime = time(NULL);
3482 }
struct bkend * rw_backend
static StartupStatusEnum StartupStatus
Definition: postmaster.c:266
#define SIGSTOP
Definition: win32.h:203
dlist_node * cur
Definition: ilist.h:180
#define dlist_foreach_modify(iter, lhead)
Definition: ilist.h:524
static pid_t PgStatPID
Definition: postmaster.c:254
slist_node * cur
Definition: ilist.h:226
static pid_t CheckpointerPID
Definition: postmaster.c:249
static pid_t WalReceiverPID
Definition: postmaster.c:251
static bool FatalError
Definition: postmaster.c:276
bool ReleasePostmasterChildSlot(int slot)
Definition: pmsignal.c:185
#define LOG
Definition: elog.h:26
dlist_node elem
Definition: postmaster.c:180
#define SIGQUIT
Definition: win32.h:197
static int Shutdown
Definition: postmaster.c:274
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
static pid_t BgWriterPID
Definition: postmaster.c:248
static pid_t StartupPID
Definition: postmaster.c:247
static dlist_head BackendList
Definition: postmaster.c:183
slist_head BackgroundWorkerList
Definition: bgworker.c:41
#define DEBUG2
Definition: elog.h:24
bool dead_end
Definition: postmaster.c:178
static void dlist_delete(dlist_node *node)
Definition: ilist.h:358
static void signal_child(pid_t pid, int signal)
Definition: postmaster.c:3811
#define ereport(elevel, rest)
Definition: elog.h:122
#define BACKEND_TYPE_BGWORKER
Definition: postmaster.c:145
int child_slot
Definition: postmaster.c:170
int bkend_type
Definition: postmaster.c:177
#define slist_container(type, membername, ptr)
Definition: ilist.h:674
static PMState pmState
Definition: postmaster.c:338
#define ImmediateShutdown
Definition: postmaster.c:272
#define free(a)
Definition: header.h:60
static pid_t WalWriterPID
Definition: postmaster.c:250
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define NULL
Definition: c.h:226
pid_t pid
Definition: postmaster.c:168
static pid_t AutoVacPID
Definition: postmaster.c:252
#define slist_foreach(iter, lhead)
Definition: ilist.h:700
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void LogChildExit(int lev, const char *procname, int pid, int exitstatus)
Definition: postmaster.c:3488
static int SendStop
Definition: postmaster.c:230
static time_t AbortStartTime
Definition: postmaster.c:342
void allow_immediate_pgstat_restart(void)
Definition: pgstat.c:726
static pid_t PgArchPID
Definition: postmaster.c:253
static int initMasks ( fd_set *  rmask)
static

Definition at line 1874 of file postmaster.c.

References fd(), i, ListenSocket, MAXLISTEN, and PGINVALID_SOCKET.

Referenced by ServerLoop().

1875 {
1876  int maxsock = -1;
1877  int i;
1878 
1879  FD_ZERO(rmask);
1880 
1881  for (i = 0; i < MAXLISTEN; i++)
1882  {
1883  int fd = ListenSocket[i];
1884 
1885  if (fd == PGINVALID_SOCKET)
1886  break;
1887  FD_SET(fd, rmask);
1888 
1889  if (fd > maxsock)
1890  maxsock = fd;
1891  }
1892 
1893  return maxsock + 1;
1894 }
static int fd(const char *x, int i)
Definition: preproc-init.c:105
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
#define PGINVALID_SOCKET
Definition: port.h:24
int i
#define MAXLISTEN
Definition: postmaster.c:214
static void InitPostmasterDeathWatchHandle ( void  )
static

Definition at line 6245 of file postmaster.c.

References Assert, ereport, errcode_for_file_access(), errcode_for_socket_access(), errmsg_internal(), FATAL, MyProcPid, postmaster_alive_fds, POSTMASTER_FD_WATCH, PostmasterPid, and TRUE.

Referenced by PostmasterMain().

6246 {
6247 #ifndef WIN32
6248 
6249  /*
6250  * Create a pipe. Postmaster holds the write end of the pipe open
6251  * (POSTMASTER_FD_OWN), and children hold the read end. Children can pass
6252  * the read file descriptor to select() to wake up in case postmaster
6253  * dies, or check for postmaster death with a (read() == 0). Children must
6254  * close the write end as soon as possible after forking, because EOF
6255  * won't be signaled in the read end until all processes have closed the
6256  * write fd. That is taken care of in ClosePostmasterPorts().
6257  */
6259  if (pipe(postmaster_alive_fds))
6260  ereport(FATAL,
6262  errmsg_internal("could not create pipe to monitor postmaster death: %m")));
6263 
6264  /*
6265  * Set O_NONBLOCK to allow testing for the fd's presence with a read()
6266  * call.
6267  */
6268  if (fcntl(postmaster_alive_fds[POSTMASTER_FD_WATCH], F_SETFL, O_NONBLOCK))
6269  ereport(FATAL,
6271  errmsg_internal("could not set postmaster death monitoring pipe to nonblocking mode: %m")));
6272 #else
6273 
6274  /*
6275  * On Windows, we use a process handle for the same purpose.
6276  */
6277  if (DuplicateHandle(GetCurrentProcess(),
6278  GetCurrentProcess(),
6279  GetCurrentProcess(),
6280  &PostmasterHandle,
6281  0,
6282  TRUE,
6283  DUPLICATE_SAME_ACCESS) == 0)
6284  ereport(FATAL,
6285  (errmsg_internal("could not duplicate postmaster handle: error code %lu",
6286  GetLastError())));
6287 #endif /* WIN32 */
6288 }
int MyProcPid
Definition: globals.c:38
#define FATAL
Definition: elog.h:52
int errcode_for_file_access(void)
Definition: elog.c:598
#define ereport(elevel, rest)
Definition: elog.h:122
int errcode_for_socket_access(void)
Definition: elog.c:669
pid_t PostmasterPid
Definition: globals.c:86
int postmaster_alive_fds[2]
Definition: postmaster.c:556
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define Assert(condition)
Definition: c.h:670
#define TRUE
Definition: c.h:214
#define POSTMASTER_FD_WATCH
Definition: postmaster.h:42
static void LogChildExit ( int  lev,
const char *  procname,
int  pid,
int  exitstatus 
)
static

Definition at line 3488 of file postmaster.c.

References ereport, errdetail(), errhint(), errmsg(), EXIT_STATUS_0, NULL, pgstat_get_crashed_backend_activity(), WEXITSTATUS, WIFEXITED, WIFSIGNALED, and WTERMSIG.

Referenced by CleanupBackend(), CleanupBackgroundWorker(), HandleChildCrash(), and reaper().

3489 {
3490  /*
3491  * size of activity_buffer is arbitrary, but set equal to default
3492  * track_activity_query_size
3493  */
3494  char activity_buffer[1024];
3495  const char *activity = NULL;
3496 
3497  if (!EXIT_STATUS_0(exitstatus))
3498  activity = pgstat_get_crashed_backend_activity(pid,
3499  activity_buffer,
3500  sizeof(activity_buffer));
3501 
3502  if (WIFEXITED(exitstatus))
3503  ereport(lev,
3504 
3505  /*------
3506  translator: %s is a noun phrase describing a child process, such as
3507  "server process" */
3508  (errmsg("%s (PID %d) exited with exit code %d",
3509  procname, pid, WEXITSTATUS(exitstatus)),
3510  activity ? errdetail("Failed process was running: %s", activity) : 0));
3511  else if (WIFSIGNALED(exitstatus))
3512 #if defined(WIN32)
3513  ereport(lev,
3514 
3515  /*------
3516  translator: %s is a noun phrase describing a child process, such as
3517  "server process" */
3518  (errmsg("%s (PID %d) was terminated by exception 0x%X",
3519  procname, pid, WTERMSIG(exitstatus)),
3520  errhint("See C include file \"ntstatus.h\" for a description of the hexadecimal value."),
3521  activity ? errdetail("Failed process was running: %s", activity) : 0));
3522 #elif defined(HAVE_DECL_SYS_SIGLIST) && HAVE_DECL_SYS_SIGLIST
3523  ereport(lev,
3524 
3525  /*------
3526  translator: %s is a noun phrase describing a child process, such as
3527  "server process" */
3528  (errmsg("%s (PID %d) was terminated by signal %d: %s",
3529  procname, pid, WTERMSIG(exitstatus),
3530  WTERMSIG(exitstatus) < NSIG ?
3531  sys_siglist[WTERMSIG(exitstatus)] : "(unknown)"),
3532  activity ? errdetail("Failed process was running: %s", activity) : 0));
3533 #else
3534  ereport(lev,
3535 
3536  /*------
3537  translator: %s is a noun phrase describing a child process, such as
3538  "server process" */
3539  (errmsg("%s (PID %d) was terminated by signal %d",
3540  procname, pid, WTERMSIG(exitstatus)),
3541  activity ? errdetail("Failed process was running: %s", activity) : 0));
3542 #endif
3543  else
3544  ereport(lev,
3545 
3546  /*------
3547  translator: %s is a noun phrase describing a child process, such as
3548  "server process" */
3549  (errmsg("%s (PID %d) exited with unrecognized status %d",
3550  procname, pid, exitstatus),
3551  activity ? errdetail("Failed process was running: %s", activity) : 0));
3552 }
int errhint(const char *fmt,...)
Definition: elog.c:987
#define WIFEXITED(w)
Definition: win32.h:180
#define WIFSIGNALED(w)
Definition: win32.h:181
int errdetail(const char *fmt,...)
Definition: elog.c:873
#define ereport(elevel, rest)
Definition: elog.h:122
#define WEXITSTATUS(w)
Definition: win32.h:182
#define NULL
Definition: c.h:226
int errmsg(const char *fmt,...)
Definition: elog.c:797
const char * pgstat_get_crashed_backend_activity(int pid, char *buffer, int buflen)
Definition: pgstat.c:3533
#define WTERMSIG(w)
Definition: win32.h:183
#define EXIT_STATUS_0(st)
Definition: postmaster.c:547
int MaxLivePostmasterChildren ( void  )

Definition at line 5435 of file postmaster.c.

References autovacuum_max_workers, max_worker_processes, and MaxConnections.

Referenced by canAcceptConnections(), PMSignalShmemInit(), PMSignalShmemSize(), and processCancelRequest().

5436 {
5437  return 2 * (MaxConnections + autovacuum_max_workers + 1 +
5439 }
int MaxConnections
Definition: globals.c:123
int autovacuum_max_workers
Definition: autovacuum.c:112
int max_worker_processes
Definition: globals.c:124
static void maybe_start_bgworker ( void  )
static

Definition at line 5685 of file postmaster.c.

References assign_backendlist_entry(), BackgroundWorkerList, BGW_NEVER_RESTART, BackgroundWorker::bgw_restart_time, BackgroundWorker::bgw_start_time, bgworker_should_start_now(), slist_mutable_iter::cur, dlist_push_head(), do_start_bgworker(), bkend::elem, FatalError, ForgetBackgroundWorker(), GetCurrentTimestamp(), HaveCrashedWorker, now(), RegisteredBgWorker::rw_backend, RegisteredBgWorker::rw_crashed_at, RegisteredBgWorker::rw_pid, RegisteredBgWorker::rw_terminate, RegisteredBgWorker::rw_worker, slist_container, slist_foreach_modify, StartWorkerNeeded, and TimestampDifferenceExceeds().

Referenced by PostmasterMain(), reaper(), ServerLoop(), and sigusr1_handler().

5686 {
5687  slist_mutable_iter iter;
5688  TimestampTz now = 0;
5689 
5690  if (FatalError)
5691  {
5692  StartWorkerNeeded = false;
5693  HaveCrashedWorker = false;
5694  return; /* not yet */
5695  }
5696 
5697  HaveCrashedWorker = false;
5698 
5700  {
5701  RegisteredBgWorker *rw;
5702 
5703  rw = slist_container(RegisteredBgWorker, rw_lnode, iter.cur);
5704 
5705  /* already running? */
5706  if (rw->rw_pid != 0)
5707  continue;
5708 
5709  /* marked for death? */
5710  if (rw->rw_terminate)
5711  {
5712  ForgetBackgroundWorker(&iter);
5713  continue;
5714  }
5715 
5716  /*
5717  * If this worker has crashed previously, maybe it needs to be
5718  * restarted (unless on registration it specified it doesn't want to
5719  * be restarted at all). Check how long ago did a crash last happen.
5720  * If the last crash is too recent, don't start it right away; let it
5721  * be restarted once enough time has passed.
5722  */
5723  if (rw->rw_crashed_at != 0)
5724  {
5726  {
5727  ForgetBackgroundWorker(&iter);
5728  continue;
5729  }
5730 
5731  if (now == 0)
5732  now = GetCurrentTimestamp();
5733 
5735  rw->rw_worker.bgw_restart_time * 1000))
5736  {
5737  HaveCrashedWorker = true;
5738  continue;
5739  }
5740  }
5741 
5743  {
5744  /* reset crash time before calling assign_backendlist_entry */
5745  rw->rw_crashed_at = 0;
5746 
5747  /*
5748  * Allocate and assign the Backend element. Note we must do this
5749  * before forking, so that we can handle out of memory properly.
5750  */
5751  if (!assign_backendlist_entry(rw))
5752  return;
5753 
5754  do_start_bgworker(rw); /* sets rw->rw_pid */
5755 
5757 #ifdef EXEC_BACKEND
5758  ShmemBackendArrayAdd(rw->rw_backend);
5759 #endif
5760 
5761  /*
5762  * Have ServerLoop call us again. Note that there might not
5763  * actually *be* another runnable worker, but we don't care all
5764  * that much; we will find out the next time we run.
5765  */
5766  StartWorkerNeeded = true;
5767  return;
5768  }
5769  }
5770 
5771  /* no runnable worker found */
5772  StartWorkerNeeded = false;
5773 }
static volatile bool StartWorkerNeeded
Definition: postmaster.c:360
struct bkend * rw_backend
static bool bgworker_should_start_now(BgWorkerStartTime start_time)
Definition: postmaster.c:5586
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1688
slist_node * cur
Definition: ilist.h:241
int bgw_restart_time
Definition: bgworker.h:93
static bool FatalError
Definition: postmaster.c:276
dlist_node elem
Definition: postmaster.c:180
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1821
static volatile bool HaveCrashedWorker
Definition: postmaster.c:361
#define slist_foreach_modify(iter, lhead)
Definition: ilist.h:716
static void do_start_bgworker(RegisteredBgWorker *rw)
Definition: postmaster.c:5530
double TimestampTz
Definition: timestamp.h:51
static bool assign_backendlist_entry(RegisteredBgWorker *rw)
Definition: postmaster.c:5628
static dlist_head BackendList
Definition: postmaster.c:183
slist_head BackgroundWorkerList
Definition: bgworker.c:41
void ForgetBackgroundWorker(slist_mutable_iter *cur)
Definition: bgworker.c:392
#define BGW_NEVER_RESTART
Definition: bgworker.h:84
#define slist_container(type, membername, ptr)
Definition: ilist.h:674
BgWorkerStartTime bgw_start_time
Definition: bgworker.h:92
BackgroundWorker rw_worker
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1652
static void pmdie ( SIGNAL_ARGS  )
static

Definition at line 2559 of file postmaster.c.

References AbortStartTime, AutoVacPID, BACKEND_TYPE_AUTOVAC, BACKEND_TYPE_BGWORKER, BACKEND_TYPE_NORMAL, BgWriterPID, BlockSig, DEBUG2, ereport, errmsg(), errmsg_internal(), FastShutdown, ImmediateShutdown, LOG, NULL, PG_SETMASK, PM_HOT_STANDBY, PM_RECOVERY, PM_RUN, PM_STARTUP, PM_WAIT_BACKENDS, PM_WAIT_BACKUP, PM_WAIT_READONLY, pmState, PostmasterStateMachine(), Shutdown, signal_child(), SignalSomeChildren(), SIGQUIT, SmartShutdown, StartupPID, TerminateChildren(), UnBlockSig, WalReceiverPID, and WalWriterPID.

Referenced by PostmasterMain().

2560 {
2561  int save_errno = errno;
2562 
2563  PG_SETMASK(&BlockSig);
2564 
2565  ereport(DEBUG2,
2566  (errmsg_internal("postmaster received signal %d",
2567  postgres_signal_arg)));
2568 
2569  switch (postgres_signal_arg)
2570  {
2571  case SIGTERM:
2572 
2573  /*
2574  * Smart Shutdown:
2575  *
2576  * Wait for children to end their work, then shut down.
2577  */
2578  if (Shutdown >= SmartShutdown)
2579  break;
2581  ereport(LOG,
2582  (errmsg("received smart shutdown request")));
2583 #ifdef USE_SYSTEMD
2584  sd_notify(0, "STOPPING=1");
2585 #endif
2586 
2587  if (pmState == PM_RUN || pmState == PM_RECOVERY ||
2589  {
2590  /* autovac workers are told to shut down immediately */
2591  /* and bgworkers too; does this need tweaking? */
2592  SignalSomeChildren(SIGTERM,
2594  /* and the autovac launcher too */
2595  if (AutoVacPID != 0)
2596  signal_child(AutoVacPID, SIGTERM);
2597  /* and the bgwriter too */
2598  if (BgWriterPID != 0)
2599  signal_child(BgWriterPID, SIGTERM);
2600  /* and the walwriter too */
2601  if (WalWriterPID != 0)
2602  signal_child(WalWriterPID, SIGTERM);
2603 
2604  /*
2605  * If we're in recovery, we can't kill the startup process
2606  * right away, because at present doing so does not release
2607  * its locks. We might want to change this in a future
2608  * release. For the time being, the PM_WAIT_READONLY state
2609  * indicates that we're waiting for the regular (read only)
2610  * backends to die off; once they do, we'll kill the startup
2611  * and walreceiver processes.
2612  */
2613  pmState = (pmState == PM_RUN) ?
2615  }
2616 
2617  /*
2618  * Now wait for online backup mode to end and backends to exit. If
2619  * that is already the case, PostmasterStateMachine will take the
2620  * next step.
2621  */
2623  break;
2624 
2625  case SIGINT:
2626 
2627  /*
2628  * Fast Shutdown:
2629  *
2630  * Abort all children with SIGTERM (rollback active transactions
2631  * and exit) and shut down when they are gone.
2632  */
2633  if (Shutdown >= FastShutdown)
2634  break;
2636  ereport(LOG,
2637  (errmsg("received fast shutdown request")));
2638 #ifdef USE_SYSTEMD
2639  sd_notify(0, "STOPPING=1");
2640 #endif
2641 
2642  if (StartupPID != 0)
2643  signal_child(StartupPID, SIGTERM);
2644  if (BgWriterPID != 0)
2645  signal_child(BgWriterPID, SIGTERM);
2646  if (WalReceiverPID != 0)
2647  signal_child(WalReceiverPID, SIGTERM);
2648  if (pmState == PM_RECOVERY)
2649  {
2651 
2652  /*
2653  * Only startup, bgwriter, walreceiver, possibly bgworkers,
2654  * and/or checkpointer should be active in this state; we just
2655  * signaled the first four, and we don't want to kill
2656  * checkpointer yet.
2657  */
2659  }
2660  else if (pmState == PM_RUN ||
2661  pmState == PM_WAIT_BACKUP ||
2665  {
2666  ereport(LOG,
2667  (errmsg("aborting any active transactions")));
2668  /* shut down all backends and workers */
2669  SignalSomeChildren(SIGTERM,
2672  /* and the autovac launcher too */
2673  if (AutoVacPID != 0)
2674  signal_child(AutoVacPID, SIGTERM);
2675  /* and the walwriter too */
2676  if (WalWriterPID != 0)
2677  signal_child(WalWriterPID, SIGTERM);
2679  }
2680 
2681  /*
2682  * Now wait for backends to exit. If there are none,
2683  * PostmasterStateMachine will take the next step.
2684  */
2686  break;
2687 
2688  case SIGQUIT:
2689 
2690  /*
2691  * Immediate Shutdown:
2692  *
2693  * abort all children with SIGQUIT, wait for them to exit,
2694  * terminate remaining ones with SIGKILL, then exit without
2695  * attempt to properly shut down the data base system.
2696  */
2697  if (Shutdown >= ImmediateShutdown)
2698  break;
2700  ereport(LOG,
2701  (errmsg("received immediate shutdown request")));
2702 #ifdef USE_SYSTEMD
2703  sd_notify(0, "STOPPING=1");
2704 #endif
2705 
2708 
2709  /* set stopwatch for them to die */
2710  AbortStartTime = time(NULL);
2711 
2712  /*
2713  * Now wait for backends to exit. If there are none,
2714  * PostmasterStateMachine will take the next step.
2715  */
2717  break;
2718  }
2719 
2721 
2722  errno = save_errno;
2723 }
static void PostmasterStateMachine(void)
Definition: postmaster.c:3561
static pid_t WalReceiverPID
Definition: postmaster.c:251
static bool SignalSomeChildren(int signal, int targets)
Definition: postmaster.c:3837
#define BACKEND_TYPE_NORMAL
Definition: postmaster.c:142
#define LOG
Definition: elog.h:26
#define BACKEND_TYPE_AUTOVAC
Definition: postmaster.c:143
#define SIGQUIT
Definition: win32.h:197
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
static int Shutdown
Definition: postmaster.c:274
static pid_t BgWriterPID
Definition: postmaster.c:248
static pid_t StartupPID
Definition: postmaster.c:247
#define SmartShutdown
Definition: postmaster.c:270
#define DEBUG2
Definition: elog.h:24
static void TerminateChildren(int signal)
Definition: postmaster.c:3881
#define FastShutdown
Definition: postmaster.c:271
sigset_t UnBlockSig
Definition: pqsignal.c:22
static void signal_child(pid_t pid, int signal)
Definition: postmaster.c:3811
#define ereport(elevel, rest)
Definition: elog.h:122
#define BACKEND_TYPE_BGWORKER
Definition: postmaster.c:145
sigset_t BlockSig
Definition: pqsignal.c:22
static PMState pmState
Definition: postmaster.c:338
#define ImmediateShutdown
Definition: postmaster.c:272
static pid_t WalWriterPID
Definition: postmaster.c:250
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define NULL
Definition: c.h:226
static pid_t AutoVacPID
Definition: postmaster.c:252
int errmsg(const char *fmt,...)
Definition: elog.c:797
static time_t AbortStartTime
Definition: postmaster.c:342
void PostmasterMain ( int  argc,
char *  argv[] 
)

Definition at line 566 of file postmaster.c.

References AddToDataDirLockFile(), ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), ApplyLauncherRegister(), ARCHIVE_MODE_OFF, Assert, autovac_init(), BlockSig, bonjour_name, ChangeToDataDir(), checkDataDir(), CheckDateTokenTables(), CloseServerPorts(), CreateDataDirLockFile(), CreateOptsFile(), DEBUG3, DestNone, dummy_handler(), elog, enable_bonjour, EnableSSL, environ, ereport, errcode(), errhint(), errmsg(), errmsg_internal(), ERROR, ExitPostmaster(), external_pid_file, ExtraOptions, FATAL, free, get_stats_option_name(), GetConfigOption(), GetCurrentTimestamp(), getInstallationPaths(), getopt(), gettimeofday(), i, InitializeGUCOptions(), InitializeMaxBackends(), InitPostmasterDeathWatchHandle(), IsBinaryUpgrade, IsPostmasterEnvironment, lfirst, list_free(), list_free_deep(), ListenAddresses, ListenSocket, load_hba(), load_ident(), LOCK_FILE_LINE_LISTEN_ADDR, LOCK_FILE_LINE_SOCKET_DIR, LOG, Log_destination, LOG_DESTINATION_STDERR, Log_destination_string, max_wal_senders, MaxConnections, MAXLISTEN, maybe_start_bgworker(), MemoryContextSwitchTo(), my_exec_path, MyProcPid, MyStartTime, name, NIL, NULL, on_proc_exit(), optarg, opterr, optind, ParseLongOption(), pfree(), PG_SETMASK, PGC_POSTMASTER, PGC_S_ARGV, PGINVALID_SOCKET, PgStartTime, pgstat_init(), PM_STARTUP, pmdie(), pmState, PostmasterContext, PostmasterPid, PostPortNumber, pqinitmask(), pqsignal(), process_shared_preload_libraries(), progname, pstrdup(), random_start_time, reaper(), Reinit, RemovePgTempFiles(), RemovePromoteSignalFiles(), ReservedBackends, reset_shared(), S_IRGRP, S_IROTH, S_IRWXG, S_IRWXO, secure_initialize(), SelectConfigFiles(), SendStop, ServerLoop(), set_debug_options(), set_max_safe_fds(), set_plan_disabling_options(), set_stack_base(), SetConfigOption(), SIG_IGN, SIGALRM, SIGCHLD, SIGHUP, SIGHUP_handler(), SIGPIPE, SIGQUIT, SIGTTIN, SIGTTOU, SIGUSR1, sigusr1_handler(), SIGUSR2, snprintf(), SplitDirectoriesString(), SplitIdentifierString(), srandom(), STARTUP_RUNNING, StartupDataBase, StartupPID, StartupStatus, status(), STATUS_OK, StreamServerPort(), strerror(), success, SysLogger_Start(), SysLoggerPID, TopMemoryContext, Unix_socket_directories, unlink_external_pid_file(), userDoption, value, wal_level, WAL_LEVEL_MINIMAL, WARNING, whereToSendOutput, write_stderr, and XLogArchiveMode.

Referenced by main().

567 {
568  int opt;
569  int status;
570  char *userDoption = NULL;
571  bool listen_addr_saved = false;
572  int i;
573  char *output_config_variable = NULL;
574 
575  MyProcPid = PostmasterPid = getpid();
576 
577  MyStartTime = time(NULL);
578 
580 
581  /*
582  * for security, no dir or file created can be group or other accessible
583  */
584  umask(S_IRWXG | S_IRWXO);
585 
586  /*
587  * Initialize random(3) so we don't get the same values in every run.
588  *
589  * Note: the seed is pretty predictable from externally-visible facts such
590  * as postmaster start time, so avoid using random() for security-critical
591  * random values during postmaster startup. At the time of first
592  * connection, PostmasterRandom will select a hopefully-more-random seed.
593  */
594  srandom((unsigned int) (MyProcPid ^ MyStartTime));
595 
596  /*
597  * By default, palloc() requests in the postmaster will be allocated in
598  * the PostmasterContext, which is space that can be recycled by backends.
599  * Allocated data that needs to be available to backends should be
600  * allocated in TopMemoryContext.
601  */
603  "Postmaster",
606 
607  /* Initialize paths to installation files */
608  getInstallationPaths(argv[0]);
609 
610  /*
611  * Set up signal handlers for the postmaster process.
612  *
613  * CAUTION: when changing this list, check for side-effects on the signal
614  * handling setup of child processes. See tcop/postgres.c,
615  * bootstrap/bootstrap.c, postmaster/bgwriter.c, postmaster/walwriter.c,
616  * postmaster/autovacuum.c, postmaster/pgarch.c, postmaster/pgstat.c,
617  * postmaster/syslogger.c, postmaster/bgworker.c and
618  * postmaster/checkpointer.c.
619  */
620  pqinitmask();
622 
623  pqsignal(SIGHUP, SIGHUP_handler); /* reread config file and have
624  * children do same */
625  pqsignal(SIGINT, pmdie); /* send SIGTERM and shut down */
626  pqsignal(SIGQUIT, pmdie); /* send SIGQUIT and die */
627  pqsignal(SIGTERM, pmdie); /* wait for children and shut down */
628  pqsignal(SIGALRM, SIG_IGN); /* ignored */
629  pqsignal(SIGPIPE, SIG_IGN); /* ignored */
630  pqsignal(SIGUSR1, sigusr1_handler); /* message from child process */
631  pqsignal(SIGUSR2, dummy_handler); /* unused, reserve for children */
632  pqsignal(SIGCHLD, reaper); /* handle child termination */
633  pqsignal(SIGTTIN, SIG_IGN); /* ignored */
634  pqsignal(SIGTTOU, SIG_IGN); /* ignored */
635  /* ignore SIGXFSZ, so that ulimit violations work like disk full */
636 #ifdef SIGXFSZ
637  pqsignal(SIGXFSZ, SIG_IGN); /* ignored */
638 #endif
639 
640  /*
641  * Options setup
642  */
644 
645  opterr = 1;
646 
647  /*
648  * Parse command-line options. CAUTION: keep this in sync with
649  * tcop/postgres.c (the option sets should not conflict) and with the
650  * common help() function in main/main.c.
651  */
652  while ((opt = getopt(argc, argv, "B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:W:-:")) != -1)
653  {
654  switch (opt)
655  {
656  case 'B':
657  SetConfigOption("shared_buffers", optarg, PGC_POSTMASTER, PGC_S_ARGV);
658  break;
659 
660  case 'b':
661  /* Undocumented flag used for binary upgrades */
662  IsBinaryUpgrade = true;
663  break;
664 
665  case 'C':
666  output_config_variable = strdup(optarg);
667  break;
668 
669  case 'D':
670  userDoption = strdup(optarg);
671  break;
672 
673  case 'd':
675  break;
676 
677  case 'E':
678  SetConfigOption("log_statement", "all", PGC_POSTMASTER, PGC_S_ARGV);
679  break;
680 
681  case 'e':
682  SetConfigOption("datestyle", "euro", PGC_POSTMASTER, PGC_S_ARGV);
683  break;
684 
685  case 'F':
686  SetConfigOption("fsync", "false", PGC_POSTMASTER, PGC_S_ARGV);
687  break;
688 
689  case 'f':
691  {
692  write_stderr("%s: invalid argument for option -f: \"%s\"\n",
693  progname, optarg);
694  ExitPostmaster(1);
695  }
696  break;
697 
698  case 'h':
699  SetConfigOption("listen_addresses", optarg, PGC_POSTMASTER, PGC_S_ARGV);
700  break;
701 
702  case 'i':
703  SetConfigOption("listen_addresses", "*", PGC_POSTMASTER, PGC_S_ARGV);
704  break;
705 
706  case 'j':
707  /* only used by interactive backend */
708  break;
709 
710  case 'k':
711  SetConfigOption("unix_socket_directories", optarg, PGC_POSTMASTER, PGC_S_ARGV);
712  break;
713 
714  case 'l':
715  SetConfigOption("ssl", "true", PGC_POSTMASTER, PGC_S_ARGV);
716  break;
717 
718  case 'N':
719  SetConfigOption("max_connections", optarg, PGC_POSTMASTER, PGC_S_ARGV);
720  break;
721 
722  case 'n':
723  /* Don't reinit shared mem after abnormal exit */
724  Reinit = false;
725  break;
726 
727  case 'O':
728  SetConfigOption("allow_system_table_mods", "true", PGC_POSTMASTER, PGC_S_ARGV);
729  break;
730 
731  case 'o':
732  /* Other options to pass to the backend on the command line */
734  sizeof(ExtraOptions) - strlen(ExtraOptions),
735  " %s", optarg);
736  break;
737 
738  case 'P':
739  SetConfigOption("ignore_system_indexes", "true", PGC_POSTMASTER, PGC_S_ARGV);
740  break;
741 
742  case 'p':
744  break;
745 
746  case 'r':
747  /* only used by single-user backend */
748  break;
749 
750  case 'S':
752  break;
753 
754  case 's':
755  SetConfigOption("log_statement_stats", "true", PGC_POSTMASTER, PGC_S_ARGV);
756  break;
757 
758  case 'T':
759 
760  /*
761  * In the event that some backend dumps core, send SIGSTOP,
762  * rather than SIGQUIT, to all its peers. This lets the wily
763  * post_hacker collect core dumps from everyone.
764  */
765  SendStop = true;
766  break;
767 
768  case 't':
769  {
770  const char *tmp = get_stats_option_name(optarg);
771 
772  if (tmp)
773  {
775  }
776  else
777  {
778  write_stderr("%s: invalid argument for option -t: \"%s\"\n",
779  progname, optarg);
780  ExitPostmaster(1);
781  }
782  break;
783  }
784 
785  case 'W':
786  SetConfigOption("post_auth_delay", optarg, PGC_POSTMASTER, PGC_S_ARGV);
787  break;
788 
789  case 'c':
790  case '-':
791  {
792  char *name,
793  *value;
794 
795  ParseLongOption(optarg, &name, &value);
796  if (!value)
797  {
798  if (opt == '-')
799  ereport(ERROR,
800  (errcode(ERRCODE_SYNTAX_ERROR),
801  errmsg("--%s requires a value",
802  optarg)));
803  else
804  ereport(ERROR,
805  (errcode(ERRCODE_SYNTAX_ERROR),
806  errmsg("-c %s requires a value",
807  optarg)));
808  }
809 
811  free(name);
812  if (value)
813  free(value);
814  break;
815  }
816 
817  default:
818  write_stderr("Try \"%s --help\" for more information.\n",
819  progname);
820  ExitPostmaster(1);
821  }
822  }
823 
824  /*
825  * Postmaster accepts no non-option switch arguments.
826  */
827  if (optind < argc)
828  {
829  write_stderr("%s: invalid argument: \"%s\"\n",
830  progname, argv[optind]);
831  write_stderr("Try \"%s --help\" for more information.\n",
832  progname);
833  ExitPostmaster(1);
834  }
835 
836  /*
837  * Locate the proper configuration files and data directory, and read
838  * postgresql.conf for the first time.
839  */
840  if (!SelectConfigFiles(userDoption, progname))
841  ExitPostmaster(2);
842 
843  if (output_config_variable != NULL)
844  {
845  /*
846  * "-C guc" was specified, so print GUC's value and exit. No extra
847  * permission check is needed because the user is reading inside the
848  * data dir.
849  */
850  const char *config_val = GetConfigOption(output_config_variable,
851  false, false);
852 
853  puts(config_val ? config_val : "");
854  ExitPostmaster(0);
855  }
856 
857  /* Verify that DataDir looks reasonable */
858  checkDataDir();
859 
860  /* And switch working directory into it */
861  ChangeToDataDir();
862 
863  /*
864  * Check for invalid combinations of GUC settings.
865  */
867  {
868  write_stderr("%s: superuser_reserved_connections must be less than max_connections\n", progname);
869  ExitPostmaster(1);
870  }
872  {
873  write_stderr("%s: max_wal_senders must be less than max_connections\n", progname);
874  ExitPostmaster(1);
875  }
877  ereport(ERROR,
878  (errmsg("WAL archival cannot be enabled when wal_level is \"minimal\"")));
880  ereport(ERROR,
881  (errmsg("WAL streaming (max_wal_senders > 0) requires wal_level \"replica\" or \"logical\"")));
882 
883  /*
884  * Other one-time internal sanity checks can go here, if they are fast.
885  * (Put any slow processing further down, after postmaster.pid creation.)
886  */
887  if (!CheckDateTokenTables())
888  {
889  write_stderr("%s: invalid datetoken tables, please fix\n", progname);
890  ExitPostmaster(1);
891  }
892 
893  /*
894  * Now that we are done processing the postmaster arguments, reset
895  * getopt(3) library so that it will work correctly in subprocesses.
896  */
897  optind = 1;
898 #ifdef HAVE_INT_OPTRESET
899  optreset = 1; /* some systems need this too */
900 #endif
901 
902  /* For debugging: display postmaster environment */
903  {
904  extern char **environ;
905  char **p;
906 
907  ereport(DEBUG3,
908  (errmsg_internal("%s: PostmasterMain: initial environment dump:",
909  progname)));
910  ereport(DEBUG3,
911  (errmsg_internal("-----------------------------------------")));
912  for (p = environ; *p; ++p)
913  ereport(DEBUG3,
914  (errmsg_internal("\t%s", *p)));
915  ereport(DEBUG3,
916  (errmsg_internal("-----------------------------------------")));
917  }
918 
919  /*
920  * Create lockfile for data directory.
921  *
922  * We want to do this before we try to grab the input sockets, because the
923  * data directory interlock is more reliable than the socket-file
924  * interlock (thanks to whoever decided to put socket files in /tmp :-().
925  * For the same reason, it's best to grab the TCP socket(s) before the
926  * Unix socket(s).
927  *
928  * Also note that this internally sets up the on_proc_exit function that
929  * is responsible for removing both data directory and socket lockfiles;
930  * so it must happen before opening sockets so that at exit, the socket
931  * lockfiles go away after CloseServerPorts runs.
932  */
933  CreateDataDirLockFile(true);
934 
935  /*
936  * Initialize SSL library, if specified.
937  */
938 #ifdef USE_SSL
939  if (EnableSSL)
940  {
941  (void) secure_initialize(true);
942  LoadedSSL = true;
943  }
944 #endif
945 
946  /*
947  * Register the apply launcher. Since it registers a background worker,
948  * it needs to be called before InitializeMaxBackends(), and it's probably
949  * a good idea to call it before any modules had chance to take the
950  * background worker slots.
951  */
953 
954  /*
955  * process any libraries that should be preloaded at postmaster start
956  */
958 
959  /*
960  * Now that loadable modules have had their chance to register background
961  * workers, calculate MaxBackends.
962  */
964 
965  /*
966  * Establish input sockets.
967  *
968  * First, mark them all closed, and set up an on_proc_exit function that's
969  * charged with closing the sockets again at postmaster shutdown.
970  */
971  for (i = 0; i < MAXLISTEN; i++)
973 
975 
976  if (ListenAddresses)
977  {
978  char *rawstring;
979  List *elemlist;
980  ListCell *l;
981  int success = 0;
982 
983  /* Need a modifiable copy of ListenAddresses */
984  rawstring = pstrdup(ListenAddresses);
985 
986  /* Parse string into list of hostnames */
987  if (!SplitIdentifierString(rawstring, ',', &elemlist))
988  {
989  /* syntax error in list */
990  ereport(FATAL,
991  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
992  errmsg("invalid list syntax in parameter \"%s\"",
993  "listen_addresses")));
994  }
995 
996  foreach(l, elemlist)
997  {
998  char *curhost = (char *) lfirst(l);
999 
1000  if (strcmp(curhost, "*") == 0)
1001  status = StreamServerPort(AF_UNSPEC, NULL,
1002  (unsigned short) PostPortNumber,
1003  NULL,
1005  else
1006  status = StreamServerPort(AF_UNSPEC, curhost,
1007  (unsigned short) PostPortNumber,
1008  NULL,
1009  ListenSocket, MAXLISTEN);
1010 
1011  if (status == STATUS_OK)
1012  {
1013  success++;
1014  /* record the first successful host addr in lockfile */
1015  if (!listen_addr_saved)
1016  {
1018  listen_addr_saved = true;
1019  }
1020  }
1021  else
1022  ereport(WARNING,
1023  (errmsg("could not create listen socket for \"%s\"",
1024  curhost)));
1025  }
1026 
1027  if (!success && elemlist != NIL)
1028  ereport(FATAL,
1029  (errmsg("could not create any TCP/IP sockets")));
1030 
1031  list_free(elemlist);
1032  pfree(rawstring);
1033  }
1034 
1035 #ifdef USE_BONJOUR
1036  /* Register for Bonjour only if we opened TCP socket(s) */
1037  if (enable_bonjour && ListenSocket[0] != PGINVALID_SOCKET)
1038  {
1039  DNSServiceErrorType err;
1040 
1041  /*
1042  * We pass 0 for interface_index, which will result in registering on
1043  * all "applicable" interfaces. It's not entirely clear from the
1044  * DNS-SD docs whether this would be appropriate if we have bound to
1045  * just a subset of the available network interfaces.
1046  */
1047  err = DNSServiceRegister(&bonjour_sdref,
1048  0,
1049  0,
1050  bonjour_name,
1051  "_postgresql._tcp.",
1052  NULL,
1053  NULL,
1054  htons(PostPortNumber),
1055  0,
1056  NULL,
1057  NULL,
1058  NULL);
1059  if (err != kDNSServiceErr_NoError)
1060  elog(LOG, "DNSServiceRegister() failed: error code %ld",
1061  (long) err);
1062 
1063  /*
1064  * We don't bother to read the mDNS daemon's reply, and we expect that
1065  * it will automatically terminate our registration when the socket is
1066  * closed at postmaster termination. So there's nothing more to be
1067  * done here. However, the bonjour_sdref is kept around so that
1068  * forked children can close their copies of the socket.
1069  */
1070  }
1071 #endif
1072 
1073 #ifdef HAVE_UNIX_SOCKETS
1075  {
1076  char *rawstring;
1077  List *elemlist;
1078  ListCell *l;
1079  int success = 0;
1080 
1081  /* Need a modifiable copy of Unix_socket_directories */
1082  rawstring = pstrdup(Unix_socket_directories);
1083 
1084  /* Parse string into list of directories */
1085  if (!SplitDirectoriesString(rawstring, ',', &elemlist))
1086  {
1087  /* syntax error in list */
1088  ereport(FATAL,
1089  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1090  errmsg("invalid list syntax in parameter \"%s\"",
1091  "unix_socket_directories")));
1092  }
1093 
1094  foreach(l, elemlist)
1095  {
1096  char *socketdir = (char *) lfirst(l);
1097 
1098  status = StreamServerPort(AF_UNIX, NULL,
1099  (unsigned short) PostPortNumber,
1100  socketdir,
1101  ListenSocket, MAXLISTEN);
1102 
1103  if (status == STATUS_OK)
1104  {
1105  success++;
1106  /* record the first successful Unix socket in lockfile */
1107  if (success == 1)
1109  }
1110  else
1111  ereport(WARNING,
1112  (errmsg("could not create Unix-domain socket in directory \"%s\"",
1113  socketdir)));
1114  }
1115 
1116  if (!success && elemlist != NIL)
1117  ereport(FATAL,
1118  (errmsg("could not create any Unix-domain sockets")));
1119 
1120  list_free_deep(elemlist);
1121  pfree(rawstring);
1122  }
1123 #endif
1124 
1125  /*
1126  * check that we have some socket to listen on
1127  */
1128  if (ListenSocket[0] == PGINVALID_SOCKET)
1129  ereport(FATAL,
1130  (errmsg("no socket created for listening")));
1131 
1132  /*
1133  * If no valid TCP ports, write an empty line for listen address,
1134  * indicating the Unix socket must be used. Note that this line is not
1135  * added to the lock file until there is a socket backing it.
1136  */
1137  if (!listen_addr_saved)
1139 
1140  /*
1141  * Set up shared memory and semaphores.
1142  */
1144 
1145  /*
1146  * Estimate number of openable files. This must happen after setting up
1147  * semaphores, because on some platforms semaphores count as open files.
1148  */
1149  set_max_safe_fds();
1150 
1151  /*
1152  * Set reference point for stack-depth checking.
1153  */
1154  set_stack_base();
1155 
1156  /*
1157  * Initialize pipe (or process handle on Windows) that allows children to
1158  * wake up from sleep on postmaster death.
1159  */
1161 
1162 #ifdef WIN32
1163 
1164  /*
1165  * Initialize I/O completion port used to deliver list of dead children.
1166  */
1167  win32ChildQueue = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1);
1168  if (win32ChildQueue == NULL)
1169  ereport(FATAL,
1170  (errmsg("could not create I/O completion port for child queue")));
1171 #endif
1172 
1173  /*
1174  * Record postmaster options. We delay this till now to avoid recording
1175  * bogus options (eg, NBuffers too high for available memory).
1176  */
1177  if (!CreateOptsFile(argc, argv, my_exec_path))
1178  ExitPostmaster(1);
1179 
1180 #ifdef EXEC_BACKEND
1181  /* Write out nondefault GUC settings for child processes to use */
1182  write_nondefault_variables(PGC_POSTMASTER);
1183 #endif
1184 
1185  /*
1186  * Write the external PID file if requested
1187  */
1188  if (external_pid_file)
1189  {
1190  FILE *fpidfile = fopen(external_pid_file, "w");
1191 
1192  if (fpidfile)
1193  {
1194  fprintf(fpidfile, "%d\n", MyProcPid);
1195  fclose(fpidfile);
1196 
1197  /* Make PID file world readable */
1198  if (chmod(external_pid_file, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) != 0)
1199  write_stderr("%s: could not change permissions of external PID file \"%s\": %s\n",
1201  }
1202  else
1203  write_stderr("%s: could not write external PID file \"%s\": %s\n",
1205 
1207  }
1208 
1209  /*
1210  * Remove old temporary files. At this point there can be no other
1211  * Postgres processes running in this directory, so this should be safe.
1212  */
1214 
1215  /*
1216  * Forcibly remove the files signaling a standby promotion request.
1217  * Otherwise, the existence of those files triggers a promotion too early,
1218  * whether a user wants that or not.
1219  *
1220  * This removal of files is usually unnecessary because they can exist
1221  * only during a few moments during a standby promotion. However there is
1222  * a race condition: if pg_ctl promote is executed and creates the files
1223  * during a promotion, the files can stay around even after the server is
1224  * brought up to new master. Then, if new standby starts by using the
1225  * backup taken from that master, the files can exist at the server
1226  * startup and should be removed in order to avoid an unexpected
1227  * promotion.
1228  *
1229  * Note that promotion signal files need to be removed before the startup
1230  * process is invoked. Because, after that, they can be used by
1231  * postmaster's SIGUSR1 signal handler.
1232  */
1234 
1235  /*
1236  * If enabled, start up syslogger collection subprocess
1237  */
1239 
1240  /*
1241  * Reset whereToSendOutput from DestDebug (its starting state) to
1242  * DestNone. This stops ereport from sending log messages to stderr unless
1243  * Log_destination permits. We don't do this until the postmaster is
1244  * fully launched, since startup failures may as well be reported to
1245  * stderr.
1246  *
1247  * If we are in fact disabling logging to stderr, first emit a log message
1248  * saying so, to provide a breadcrumb trail for users who may not remember
1249  * that their logging is configured to go somewhere else.
1250  */
1252  ereport(LOG,
1253  (errmsg("ending log output to stderr"),
1254  errhint("Future log output will go to log destination \"%s\".",
1256 
1258 
1259  /*
1260  * Initialize stats collection subsystem (this does NOT start the
1261  * collector process!)
1262  */
1263  pgstat_init();
1264 
1265  /*
1266  * Initialize the autovacuum subsystem (again, no process start yet)
1267  */
1268  autovac_init();
1269 
1270  /*
1271  * Load configuration files for client authentication.
1272  */
1273  if (!load_hba())
1274  {
1275  /*
1276  * It makes no sense to continue if we fail to load the HBA file,
1277  * since there is no way to connect to the database in this case.
1278  */
1279  ereport(FATAL,
1280  (errmsg("could not load pg_hba.conf")));
1281  }
1282  if (!load_ident())
1283  {
1284  /*
1285  * We can start up without the IDENT file, although it means that you
1286  * cannot log in using any of the authentication methods that need a
1287  * user name mapping. load_ident() already logged the details of error
1288  * to the log.
1289  */
1290  }
1291 
1292 #ifdef HAVE_PTHREAD_IS_THREADED_NP
1293 
1294  /*
1295  * On macOS, libintl replaces setlocale() with a version that calls
1296  * CFLocaleCopyCurrent() when its second argument is "" and every relevant
1297  * environment variable is unset or empty. CFLocaleCopyCurrent() makes
1298  * the process multithreaded. The postmaster calls sigprocmask() and
1299  * calls fork() without an immediate exec(), both of which have undefined
1300  * behavior in a multithreaded program. A multithreaded postmaster is the
1301  * normal case on Windows, which offers neither fork() nor sigprocmask().
1302  */
1303  if (pthread_is_threaded_np() != 0)
1304  ereport(FATAL,
1305  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1306  errmsg("postmaster became multithreaded during startup"),
1307  errhint("Set the LC_ALL environment variable to a valid locale.")));
1308 #endif
1309 
1310  /*
1311  * Remember postmaster startup time
1312  */
1314 #ifndef HAVE_STRONG_RANDOM
1315  /* RandomCancelKey wants its own copy */
1317 #endif
1318 
1319  /*
1320  * We're ready to rock and roll...
1321  */
1323  Assert(StartupPID != 0);
1325  pmState = PM_STARTUP;
1326 
1327  /* Some workers may be scheduled to start now */
1329 
1330  status = ServerLoop();
1331 
1332  /*
1333  * ServerLoop probably shouldn't ever return, but if it does, close down.
1334  */
1335  ExitPostmaster(status != STATUS_OK);
1336 
1337  abort(); /* not reached */
1338 }
pg_stack_base_t set_stack_base(void)
Definition: postgres.c:3043
const char * GetConfigOption(const char *name, bool missing_ok, bool restrict_superuser)
Definition: guc.c:6657
int secure_initialize(bool isServerStart)
Definition: be-secure.c:73
#define NIL
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bool IsPostmasterEnvironment
Definition: globals.c:99
bool EnableSSL
Definition: postmaster.c:233
static struct @76 value
#define SIGUSR1
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static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
#define write_stderr(str)
Definition: parallel.c:182
static bool CreateOptsFile(int argc, char *argv[], char *fullprogname)
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Definition: datetime.c:4570
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Definition: elog.c:575
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Definition: postgres.c:3262
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Definition: syslogger.c:511
void set_debug_options(int debug_flag, GucContext context, GucSource source)
Definition: postgres.c:3191
#define LOG
Definition: elog.h:26
const char * progname
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Definition: list.c:1147
char * Unix_socket_directories
Definition: postmaster.c:197
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Definition: globals.c:101
#define SIGQUIT
Definition: win32.h:197
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:72
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
bool load_ident(void)
Definition: hba.c:2727
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Definition: autovacuum.c:2969
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Definition: pqsignal.c:41
static void CloseServerPorts(int status, Datum arg)
Definition: postmaster.c:1345
static void InitPostmasterDeathWatchHandle(void)
Definition: postmaster.c:6245
bool SplitDirectoriesString(char *rawstring, char separator, List **namelist)
Definition: varlena.c:3254
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Definition: postmaster.c:1444
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Definition: mcxt.c:992
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Definition: win32.h:193
int optind
Definition: getopt.c:51
#define ERROR
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Definition: miscinit.c:1073
static pid_t StartupPID
Definition: postmaster.c:247
int PostPortNumber
Definition: postmaster.c:194
int ReservedBackends
Definition: postmaster.c:211
static void ExitPostmaster(int status) pg_attribute_noreturn()
Definition: postmaster.c:4903
#define FATAL
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char * external_pid_file
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#define ALLOCSET_DEFAULT_SIZES
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#define S_IRGRP
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#define LOCK_FILE_LINE_SOCKET_DIR
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static bool success
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Definition: dest.h:88
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:6633
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Definition: hba.c:1945
char * bonjour_name
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Definition: xlog.c:92
static pid_t SysLoggerPID
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#define S_IROTH
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Definition: miscinit.c:115
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Definition: getopt.c:50
static void getInstallationPaths(const char *argv0)
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Definition: elog.c:107
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Definition: postmaster.c:200
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Definition: pqcomm.c:311
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
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MemoryContext TopMemoryContext
Definition: mcxt.c:43
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Definition: postmaster.c:2559
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Definition: postmaster.c:242
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Definition: xlog.c:11968
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Definition: walsender.c:112
pid_t PostmasterPid
Definition: globals.c:86
#define WARNING
Definition: elog.h:40
char my_exec_path[MAXPGPATH]
Definition: globals.c:63
sigset_t BlockSig
Definition: pqsignal.c:22
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:440
static PMState pmState
Definition: postmaster.c:338
bool SelectConfigFiles(const char *userDoption, const char *progname)
Definition: guc.c:4650
void ApplyLauncherRegister(void)
Definition: launcher.c:485
#define PGINVALID_SOCKET
Definition: port.h:24
int MaxConnections
Definition: globals.c:123
TimestampTz PgStartTime
Definition: timestamp.c:48
#define SIGPIPE
Definition: win32.h:201
#define S_IRWXO
Definition: win32.h:484
#define SIGHUP
Definition: win32.h:196
#define LOG_DESTINATION_STDERR
Definition: elog.h:395
static void reset_shared(int port)
Definition: postmaster.c:2468
static bool Reinit
Definition: postmaster.c:229
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
#define free(a)
Definition: header.h:60
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define NULL
Definition: c.h:226
static char ExtraOptions[MAXPGPATH]
Definition: postmaster.c:220
static int ServerLoop(void)
Definition: postmaster.c:1638
#define Assert(condition)
Definition: c.h:670
#define lfirst(lc)
Definition: pg_list.h:106
void RemovePgTempFiles(void)
Definition: fd.c:2578
static void reaper(SIGNAL_ARGS)
Definition: postmaster.c:2729
void InitializeMaxBackends(void)
Definition: postinit.c:495
const char * name
Definition: encode.c:521
#define S_IRWXG
Definition: win32.h:480
#define SIGTTOU
Definition: win32.h:208
static const char * userDoption
Definition: postgres.c:159
void set_max_safe_fds(void)
Definition: fd.c:837
int errmsg(const char *fmt,...)
Definition: elog.c:797
char * optarg
Definition: getopt.c:53
void list_free(List *list)
Definition: list.c:1133
int i
const char * strerror(int errnum)
Definition: strerror.c:19
static void sigusr1_handler(SIGNAL_ARGS)
Definition: postmaster.c:4936
void pgstat_init(void)
Definition: pgstat.c:320
void srandom(unsigned int seed)
Definition: srandom.c:22
int Log_destination
Definition: elog.c:106
static void maybe_start_bgworker(void)
Definition: postmaster.c:5685
char ** environ
#define elog
Definition: elog.h:219
CommandDest whereToSendOutput
Definition: postgres.c:86
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:222
#define SIGCHLD
Definition: win32.h:206
static int SendStop
Definition: postmaster.c:230
void process_shared_preload_libraries(void)
Definition: miscinit.c:1465
Definition: pg_list.h:45
#define MAXLISTEN
Definition: postmaster.c:214
#define SIGALRM
Definition: win32.h:202
static struct timeval random_start_time
Definition: postmaster.c:370
MemoryContext PostmasterContext
Definition: mcxt.c:45
#define SIGUSR2
Definition: win32.h:212
void InitializeGUCOptions(void)
Definition: guc.c:4428
bool PostmasterMarkPIDForWorkerNotify ( int  pid)

Definition at line 5781 of file postmaster.c.

References bkend::bgworker_notify, dlist_iter::cur, dlist_container, dlist_foreach, and bkend::pid.

Referenced by BackgroundWorkerStateChange().

5782 {
5783  dlist_iter iter;
5784  Backend *bp;
5785 
5786  dlist_foreach(iter, &BackendList)
5787  {
5788  bp = dlist_container(Backend, elem, iter.cur);
5789  if (bp->pid == pid)
5790  {
5791  bp->bgworker_notify = true;
5792  return true;
5793  }
5794  }
5795  return false;
5796 }
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
bool bgworker_notify
Definition: postmaster.c:179
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
static dlist_head BackendList
Definition: postmaster.c:183
dlist_node * cur
Definition: ilist.h:161
pid_t pid
Definition: postmaster.c:168
static void PostmasterStateMachine ( void  )
static

Definition at line 3561 of file postmaster.c.

References AbortStartTime, Assert, AutoVacPID, BACKEND_TYPE_ALL, BACKEND_TYPE_NORMAL, BACKEND_TYPE_WORKER, BackupInProgress(), BgWriterPID, CancelBackup(), CheckpointerPID, CountChildren(), dlist_is_empty(), ereport, errmsg(), ExitPostmaster(), FatalError, ImmediateShutdown, LOG, NoShutdown, PgArchPID, PgStatPID, PM_NO_CHILDREN, PM_SHUTDOWN, PM_SHUTDOWN_2, PM_STARTUP, PM_WAIT_BACKENDS, PM_WAIT_BACKUP, PM_WAIT_DEAD_END, PM_WAIT_READONLY, pmState, PostPortNumber, ReachedNormalRunning, reset_shared(), ResetBackgroundWorkerCrashTimes(), restart_after_crash, shmem_exit(), Shutdown, signal_child(), SignalChildren, SIGQUIT, SIGUSR2, StartCheckpointer, STARTUP_CRASHED, STARTUP_RUNNING, StartupDataBase, StartupPID, StartupStatus, WalReceiverPID, and WalWriterPID.

Referenced by pmdie(), reaper(), and sigusr1_handler().

3562 {
3563  if (pmState == PM_WAIT_BACKUP)
3564  {
3565  /*
3566  * PM_WAIT_BACKUP state ends when online backup mode is not active.
3567  */
3568  if (!BackupInProgress())
3570  }
3571 
3572  if (pmState == PM_WAIT_READONLY)
3573  {
3574  /*
3575  * PM_WAIT_READONLY state ends when we have no regular backends that
3576  * have been started during recovery. We kill the startup and
3577  * walreceiver processes and transition to PM_WAIT_BACKENDS. Ideally,
3578  * we might like to kill these processes first and then wait for
3579  * backends to die off, but that doesn't work at present because
3580  * killing the startup process doesn't release its locks.
3581  */
3583  {
3584  if (StartupPID != 0)
3585  signal_child(StartupPID, SIGTERM);
3586  if (WalReceiverPID != 0)
3587  signal_child(WalReceiverPID, SIGTERM);
3589  }
3590  }
3591 
3592  /*
3593  * If we are in a state-machine state that implies waiting for backends to
3594  * exit, see if they're all gone, and change state if so.
3595  */
3596  if (pmState == PM_WAIT_BACKENDS)
3597  {
3598  /*
3599  * PM_WAIT_BACKENDS state ends when we have no regular backends
3600  * (including autovac workers), no bgworkers (including unconnected
3601  * ones), and no walwriter, autovac launcher or bgwriter. If we are
3602  * doing crash recovery or an immediate shutdown then we expect the
3603  * checkpointer to exit as well, otherwise not. The archiver, stats,
3604  * and syslogger processes are disregarded since they are not
3605  * connected to shared memory; we also disregard dead_end children
3606  * here. Walsenders are also disregarded, they will be terminated
3607  * later after writing the checkpoint record, like the archiver
3608  * process.
3609  */
3611  StartupPID == 0 &&
3612  WalReceiverPID == 0 &&
3613  BgWriterPID == 0 &&
3614  (CheckpointerPID == 0 ||
3616  WalWriterPID == 0 &&
3617  AutoVacPID == 0)
3618  {
3620  {
3621  /*
3622  * Start waiting for dead_end children to die. This state
3623  * change causes ServerLoop to stop creating new ones.
3624  */
3626 
3627  /*
3628  * We already SIGQUIT'd the archiver and stats processes, if
3629  * any, when we started immediate shutdown or entered
3630  * FatalError state.
3631  */
3632  }
3633  else
3634  {
3635  /*
3636  * If we get here, we are proceeding with normal shutdown. All
3637  * the regular children are gone, and it's time to tell the
3638  * checkpointer to do a shutdown checkpoint.
3639  */
3641  /* Start the checkpointer if not running */
3642  if (CheckpointerPID == 0)
3644  /* And tell it to shut down */
3645  if (CheckpointerPID != 0)
3646  {
3648  pmState = PM_SHUTDOWN;
3649  }
3650  else
3651  {
3652  /*
3653  * If we failed to fork a checkpointer, just shut down.
3654  * Any required cleanup will happen at next restart. We
3655  * set FatalError so that an "abnormal shutdown" message
3656  * gets logged when we exit.
3657  */
3658  FatalError = true;
3660 
3661  /* Kill the walsenders, archiver and stats collector too */
3663  if (PgArchPID != 0)
3665  if (PgStatPID != 0)
3667  }
3668  }
3669  }
3670  }
3671 
3672  if (pmState == PM_SHUTDOWN_2)
3673  {
3674  /*
3675  * PM_SHUTDOWN_2 state ends when there's no other children than
3676  * dead_end children left. There shouldn't be any regular backends
3677  * left by now anyway; what we're really waiting for is walsenders and
3678  * archiver.
3679  *
3680  * Walreceiver should normally be dead by now, but not when a fast
3681  * shutdown is performed during recovery.
3682  */
3683  if (PgArchPID == 0 && CountChildren(BACKEND_TYPE_ALL) == 0 &&
3684  WalReceiverPID == 0)
3685  {
3687  }
3688  }
3689 
3690  if (pmState == PM_WAIT_DEAD_END)
3691  {
3692  /*
3693  * PM_WAIT_DEAD_END state ends when the BackendList is entirely empty
3694  * (ie, no dead_end children remain), and the archiver and stats
3695  * collector are gone too.
3696  *
3697  * The reason we wait for those two is to protect them against a new
3698  * postmaster starting conflicting subprocesses; this isn't an
3699  * ironclad protection, but it at least helps in the
3700  * shutdown-and-immediately-restart scenario. Note that they have
3701  * already been sent appropriate shutdown signals, either during a
3702  * normal state transition leading up to PM_WAIT_DEAD_END, or during
3703  * FatalError processing.
3704  */
3705  if (dlist_is_empty(&BackendList) &&
3706  PgArchPID == 0 && PgStatPID == 0)
3707  {
3708  /* These other guys should be dead already */
3709  Assert(StartupPID == 0);
3710  Assert(WalReceiverPID == 0);
3711  Assert(BgWriterPID == 0);
3712  Assert(CheckpointerPID == 0);
3713  Assert(WalWriterPID == 0);
3714  Assert(AutoVacPID == 0);
3715  /* syslogger is not considered here */
3717  }
3718  }
3719 
3720  /*
3721  * If we've been told to shut down, we exit as soon as there are no
3722  * remaining children. If there was a crash, cleanup will occur at the
3723  * next startup. (Before PostgreSQL 8.3, we tried to recover from the
3724  * crash before exiting, but that seems unwise if we are quitting because
3725  * we got SIGTERM from init --- there may well not be time for recovery
3726  * before init decides to SIGKILL us.)
3727  *
3728  * Note that the syslogger continues to run. It will exit when it sees
3729  * EOF on its input pipe, which happens when there are no more upstream
3730  * processes.
3731  */
3733  {
3734  if (FatalError)
3735  {
3736  ereport(LOG, (errmsg("abnormal database system shutdown")));
3737  ExitPostmaster(1);
3738  }
3739  else
3740  {
3741  /*
3742  * Terminate exclusive backup mode to avoid recovery after a clean
3743  * fast shutdown. Since an exclusive backup can only be taken
3744  * during normal running (and not, for example, while running
3745  * under Hot Standby) it only makes sense to do this if we reached
3746  * normal running. If we're still in recovery, the backup file is
3747  * one we're recovering *from*, and we must keep it around so that
3748  * recovery restarts from the right place.
3749  */
3751  CancelBackup();
3752 
3753  /* Normal exit from the postmaster is here */
3754  ExitPostmaster(0);
3755  }
3756  }
3757 
3758  /*
3759  * If the startup process failed, or the user does not want an automatic
3760  * restart after backend crashes, wait for all non-syslogger children to
3761  * exit, and then exit postmaster. We don't try to reinitialize when the
3762  * startup process fails, because more than likely it will just fail again
3763  * and we will keep trying forever.
3764  */
3765  if (pmState == PM_NO_CHILDREN &&
3767  ExitPostmaster(1);
3768 
3769  /*
3770  * If we need to recover from a crash, wait for all non-syslogger children
3771  * to exit, then reset shmem and StartupDataBase.
3772  */
3773  if (FatalError && pmState == PM_NO_CHILDREN)
3774  {
3775  ereport(LOG,
3776  (errmsg("all server processes terminated; reinitializing")));
3777 
3778  /* allow background workers to immediately restart */
3780 
3781  shmem_exit(1);
3783 
3785  Assert(StartupPID != 0);
3787  pmState = PM_STARTUP;
3788  /* crash recovery started, reset SIGKILL flag */
3789  AbortStartTime = 0;
3790  }
3791 }
void CancelBackup(void)
Definition: xlog.c:11280
static StartupStatusEnum StartupStatus
Definition: postmaster.c:266
#define BACKEND_TYPE_ALL
Definition: postmaster.c:146
#define StartupDataBase()
Definition: postmaster.c:540
static pid_t PgStatPID
Definition: postmaster.c:254
static pid_t CheckpointerPID
Definition: postmaster.c:249
static pid_t WalReceiverPID
Definition: postmaster.c:251
static bool FatalError
Definition: postmaster.c:276
void shmem_exit(int code)
Definition: ipc.c:215
#define BACKEND_TYPE_NORMAL
Definition: postmaster.c:142
#define LOG
Definition: elog.h:26
bool BackupInProgress(void)
Definition: xlog.c:11260
void ResetBackgroundWorkerCrashTimes(void)
Definition: bgworker.c:460
#define SIGQUIT
Definition: win32.h:197
#define SignalChildren(sig)
Definition: postmaster.c:420
static int Shutdown
Definition: postmaster.c:274
static pid_t BgWriterPID
Definition: postmaster.c:248
#define StartCheckpointer()
Definition: postmaster.c:542
static int CountChildren(int target)
Definition: postmaster.c:5163
static pid_t StartupPID
Definition: postmaster.c:247
int PostPortNumber
Definition: postmaster.c:194
static void ExitPostmaster(int status) pg_attribute_noreturn()
Definition: postmaster.c:4903
bool restart_after_crash
Definition: postmaster.c:244
static dlist_head BackendList
Definition: postmaster.c:183
static void signal_child(pid_t pid, int signal)
Definition: postmaster.c:3811
#define ereport(elevel, rest)
Definition: elog.h:122
static PMState pmState
Definition: postmaster.c:338
#define BACKEND_TYPE_WORKER
Definition: postmaster.c:148
#define ImmediateShutdown
Definition: postmaster.c:272
static void reset_shared(int port)
Definition: postmaster.c:2468
static pid_t WalWriterPID
Definition: postmaster.c:250
#define Assert(condition)
Definition: c.h:670
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
#define NoShutdown
Definition: postmaster.c:269
static pid_t AutoVacPID
Definition: postmaster.c:252
int errmsg(const char *fmt,...)
Definition: elog.c:797
static bool ReachedNormalRunning
Definition: postmaster.c:346
static time_t AbortStartTime
Definition: postmaster.c:342
#define SIGUSR2
Definition: win32.h:212
static pid_t PgArchPID
Definition: postmaster.c:253
static void processCancelRequest ( Port port,
void *  pkt 
)
static

Definition at line 2233 of file postmaster.c.

References CancelRequestPacket::backendPID, bkend::cancel_key, CancelRequestPacket::cancelAuthCode, dlist_iter::cur, DEBUG2, dlist_container, dlist_foreach, ereport, errmsg(), errmsg_internal(), i, LOG, MaxLivePostmasterChildren(), bkend::pid, and signal_child().

Referenced by ProcessStartupPacket().

2234 {
2235  CancelRequestPacket *canc = (CancelRequestPacket *) pkt;
2236  int backendPID;
2237  int32 cancelAuthCode;
2238  Backend *bp;
2239 
2240 #ifndef EXEC_BACKEND
2241  dlist_iter iter;
2242 #else
2243  int i;
2244 #endif
2245 
2246  backendPID = (int) ntohl(canc->backendPID);
2247  cancelAuthCode = (int32) ntohl(canc->cancelAuthCode);
2248 
2249  /*
2250  * See if we have a matching backend. In the EXEC_BACKEND case, we can no
2251  * longer access the postmaster's own backend list, and must rely on the
2252  * duplicate array in shared memory.
2253  */
2254 #ifndef EXEC_BACKEND
2255  dlist_foreach(iter, &BackendList)
2256  {
2257  bp = dlist_container(Backend, elem, iter.cur);
2258 #else
2259  for (i = MaxLivePostmasterChildren() - 1; i >= 0; i--)
2260  {
2261  bp = (Backend *) &ShmemBackendArray[i];
2262 #endif
2263  if (bp->pid == backendPID)
2264  {
2265  if (bp->cancel_key == cancelAuthCode)
2266  {
2267  /* Found a match; signal that backend to cancel current op */
2268  ereport(DEBUG2,
2269  (errmsg_internal("processing cancel request: sending SIGINT to process %d",
2270  backendPID)));
2271  signal_child(bp->pid, SIGINT);
2272  }
2273  else
2274  /* Right PID, wrong key: no way, Jose */
2275  ereport(LOG,
2276  (errmsg("wrong key in cancel request for process %d",
2277  backendPID)));
2278  return;
2279  }
2280  }
2281 
2282  /* No matching backend */
2283  ereport(LOG,
2284  (errmsg("PID %d in cancel request did not match any process",
2285  backendPID)));
2286 }
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
uint32 cancelAuthCode
Definition: pqcomm.h:194
#define LOG
Definition: elog.h:26
signed int int32
Definition: c.h:253
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
uint32 backendPID
Definition: pqcomm.h:193
static dlist_head BackendList
Definition: postmaster.c:183
#define DEBUG2
Definition: elog.h:24
int32 cancel_key
Definition: postmaster.c:169
static void signal_child(pid_t pid, int signal)
Definition: postmaster.c:3811
#define ereport(elevel, rest)
Definition: elog.h:122
dlist_node * cur
Definition: ilist.h:161
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
int MaxLivePostmasterChildren(void)
Definition: postmaster.c:5435
pid_t pid
Definition: postmaster.c:168
int errmsg(const char *fmt,...)
Definition: elog.c:797
int i
static int ProcessStartupPacket ( Port port,
bool  SSLdone 
)
static

Definition at line 1909 of file postmaster.c.

References SockAddr::addr, am_db_walsender, am_walsender, buf, CAC_OK, CAC_RECOVERY, CAC_SHUTDOWN, CAC_STARTUP, CAC_TOOMANY, CAC_WAITBACKUP, Port::canAcceptConnections, CANCEL_REQUEST_CODE, Port::cmdline_options, COMMERROR, StartupPacket::database, Port::database_name, Db_user_namespace, EINTR, ereport, errcode(), ERRCODE_CANNOT_CONNECT_NOW, errcode_for_socket_access(), errhint(), errmsg(), FATAL, FrontendProtocol, Port::guc_options, IS_AF_UNIX, Port::laddr, lappend(), MAX_STARTUP_PACKET_LENGTH, MemoryContextSwitchTo(), NAMEDATALEN, NEGOTIATE_SSL_CODE, NIL, NULL, StartupPacket::options, palloc0(), parse_bool(), PG_PROTOCOL_EARLIEST, PG_PROTOCOL_LATEST, PG_PROTOCOL_MAJOR, PG_PROTOCOL_MINOR, pq_endmsgread(), pq_getbytes(), pq_startmsgread(), processCancelRequest(), Port::proto, psprintf(), pstrdup(), secure_open_server(), send, Port::sock, STATUS_ERROR, STATUS_OK, TopMemoryContext, StartupPacket::user, and Port::user_name.

Referenced by BackendInitialize().

1910 {
1911  int32 len;
1912  void *buf;
1913  ProtocolVersion proto;
1914  MemoryContext oldcontext;
1915 
1916  pq_startmsgread();
1917  if (pq_getbytes((char *) &len, 4) == EOF)
1918  {
1919  /*
1920  * EOF after SSLdone probably means the client didn't like our
1921  * response to NEGOTIATE_SSL_CODE. That's not an error condition, so
1922  * don't clutter the log with a complaint.
1923  */
1924  if (!SSLdone)
1926  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1927  errmsg("incomplete startup packet")));
1928  return STATUS_ERROR;
1929  }
1930 
1931  len = ntohl(len);
1932  len -= 4;
1933 
1934  if (len < (int32) sizeof(ProtocolVersion) ||
1936  {
1938  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1939  errmsg("invalid length of startup packet")));
1940  return STATUS_ERROR;
1941  }
1942 
1943  /*
1944  * Allocate at least the size of an old-style startup packet, plus one
1945  * extra byte, and make sure all are zeroes. This ensures we will have
1946  * null termination of all strings, in both fixed- and variable-length
1947  * packet layouts.
1948  */
1949  if (len <= (int32) sizeof(StartupPacket))
1950  buf = palloc0(sizeof(StartupPacket) + 1);
1951  else
1952  buf = palloc0(len + 1);
1953 
1954  if (pq_getbytes(buf, len) == EOF)
1955  {
1957  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1958  errmsg("incomplete startup packet")));
1959  return STATUS_ERROR;
1960  }
1961  pq_endmsgread();
1962 
1963  /*
1964  * The first field is either a protocol version number or a special
1965  * request code.
1966  */
1967  port->proto = proto = ntohl(*((ProtocolVersion *) buf));
1968 
1969  if (proto == CANCEL_REQUEST_CODE)
1970  {
1971  processCancelRequest(port, buf);
1972  /* Not really an error, but we don't want to proceed further */
1973  return STATUS_ERROR;
1974  }
1975 
1976  if (proto == NEGOTIATE_SSL_CODE && !SSLdone)
1977  {
1978  char SSLok;
1979 
1980 #ifdef USE_SSL
1981  /* No SSL when disabled or on Unix sockets */
1982  if (!LoadedSSL || IS_AF_UNIX(port->laddr.addr.ss_family))
1983  SSLok = 'N';
1984  else
1985  SSLok = 'S'; /* Support for SSL */
1986 #else
1987  SSLok = 'N'; /* No support for SSL */
1988 #endif
1989 
1990 retry1:
1991  if (send(port->sock, &SSLok, 1, 0) != 1)
1992  {
1993  if (errno == EINTR)
1994  goto retry1; /* if interrupted, just retry */
1997  errmsg("failed to send SSL negotiation response: %m")));
1998  return STATUS_ERROR; /* close the connection */
1999  }
2000 
2001 #ifdef USE_SSL
2002  if (SSLok == 'S' && secure_open_server(port) == -1)
2003  return STATUS_ERROR;
2004 #endif
2005  /* regular startup packet, cancel, etc packet should follow... */
2006  /* but not another SSL negotiation request */
2007  return ProcessStartupPacket(port, true);
2008  }
2009 
2010  /* Could add additional special packet types here */
2011 
2012  /*
2013  * Set FrontendProtocol now so that ereport() knows what format to send if
2014  * we fail during startup.
2015  */
2016  FrontendProtocol = proto;
2017 
2018  /* Check we can handle the protocol the frontend is using. */
2019 
2024  ereport(FATAL,
2025  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2026  errmsg("unsupported frontend protocol %u.%u: server supports %u.0 to %u.%u",
2027  PG_PROTOCOL_MAJOR(proto), PG_PROTOCOL_MINOR(proto),
2031 
2032  /*
2033  * Now fetch parameters out of startup packet and save them into the Port
2034  * structure. All data structures attached to the Port struct must be
2035  * allocated in TopMemoryContext so that they will remain available in a
2036  * running backend (even after PostmasterContext is destroyed). We need
2037  * not worry about leaking this storage on failure, since we aren't in the
2038  * postmaster process anymore.
2039  */
2041 
2042  if (PG_PROTOCOL_MAJOR(proto) >= 3)
2043  {
2044  int32 offset = sizeof(ProtocolVersion);
2045 
2046  /*
2047  * Scan packet body for name/option pairs. We can assume any string
2048  * beginning within the packet body is null-terminated, thanks to
2049  * zeroing extra byte above.
2050  */
2051  port->guc_options = NIL;
2052 
2053  while (offset < len)
2054  {
2055  char *nameptr = ((char *) buf) + offset;
2056  int32 valoffset;
2057  char *valptr;
2058 
2059  if (*nameptr == '\0')
2060  break; /* found packet terminator */
2061  valoffset = offset + strlen(nameptr) + 1;
2062  if (valoffset >= len)
2063  break; /* missing value, will complain below */
2064  valptr = ((char *) buf) + valoffset;
2065 
2066  if (strcmp(nameptr, "database") == 0)
2067  port->database_name = pstrdup(valptr);
2068  else if (strcmp(nameptr, "user") == 0)
2069  port->user_name = pstrdup(valptr);
2070  else if (strcmp(nameptr, "options") == 0)
2071  port->cmdline_options = pstrdup(valptr);
2072  else if (strcmp(nameptr, "replication") == 0)
2073  {
2074  /*
2075  * Due to backward compatibility concerns the replication
2076  * parameter is a hybrid beast which allows the value to be
2077  * either boolean or the string 'database'. The latter
2078  * connects to a specific database which is e.g. required for
2079  * logical decoding while.
2080  */
2081  if (strcmp(valptr, "database") == 0)
2082  {
2083  am_walsender = true;
2084  am_db_walsender = true;
2085  }
2086  else if (!parse_bool(valptr, &am_walsender))
2087  ereport(FATAL,
2088  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2089  errmsg("invalid value for parameter \"%s\": \"%s\"",
2090  "replication",
2091  valptr),
2092  errhint("Valid values are: \"false\", 0, \"true\", 1, \"database\".")));
2093  }
2094  else
2095  {
2096  /* Assume it's a generic GUC option */
2097  port->guc_options = lappend(port->guc_options,
2098  pstrdup(nameptr));
2099  port->guc_options = lappend(port->guc_options,
2100  pstrdup(valptr));
2101  }
2102  offset = valoffset + strlen(valptr) + 1;
2103  }
2104 
2105  /*
2106  * If we didn't find a packet terminator exactly at the end of the
2107  * given packet length, complain.
2108  */
2109  if (offset != len - 1)
2110  ereport(FATAL,
2111  (errcode(ERRCODE_PROTOCOL_VIOLATION),
2112  errmsg("invalid startup packet layout: expected terminator as last byte")));
2113  }
2114  else
2115  {
2116  /*
2117  * Get the parameters from the old-style, fixed-width-fields startup
2118  * packet as C strings. The packet destination was cleared first so a
2119  * short packet has zeros silently added. We have to be prepared to
2120  * truncate the pstrdup result for oversize fields, though.
2121  */
2122  StartupPacket *packet = (StartupPacket *) buf;
2123 
2124  port->database_name = pstrdup(packet->database);
2125  if (strlen(port->database_name) > sizeof(packet->database))
2126  port->database_name[sizeof(packet->database)] = '\0';
2127  port->user_name = pstrdup(packet->user);
2128  if (strlen(port->user_name) > sizeof(packet->user))
2129  port->