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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 5635 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().

5636 {
5637  Backend *bn;
5638 
5639  /*
5640  * Compute the cancel key that will be assigned to this session. We
5641  * probably don't need cancel keys for background workers, but we'd better
5642  * have something random in the field to prevent unfriendly people from
5643  * sending cancels to them.
5644  */
5646  {
5647  ereport(LOG,
5648  (errcode(ERRCODE_INTERNAL_ERROR),
5649  errmsg("could not generate random cancel key")));
5650 
5652  return false;
5653  }
5654 
5655  bn = malloc(sizeof(Backend));
5656  if (bn == NULL)
5657  {
5658  ereport(LOG,
5659  (errcode(ERRCODE_OUT_OF_MEMORY),
5660  errmsg("out of memory")));
5661 
5662  /*
5663  * The worker didn't really crash, but setting this nonzero makes
5664  * postmaster wait a bit before attempting to start it again; if it
5665  * tried again right away, most likely it'd find itself under the same
5666  * memory pressure.
5667  */
5669  return false;
5670  }
5671 
5672  bn->cancel_key = MyCancelKey;
5675  bn->dead_end = false;
5676  bn->bgworker_notify = false;
5677 
5678  rw->rw_backend = bn;
5679  rw->rw_child_slot = bn->child_slot;
5680 
5681  return true;
5682 }
struct bkend * rw_backend
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1569
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:50
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:5130
int child_slot
Definition: postmaster.c:170
int bkend_type
Definition: postmaster.c:177
#define NULL
Definition: c.h:229
int MyPMChildSlot
Definition: globals.c:42
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void BackendInitialize ( Port port)
static

Definition at line 4071 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().

4072 {
4073  int status;
4074  int ret;
4075  char remote_host[NI_MAXHOST];
4076  char remote_port[NI_MAXSERV];
4077  char remote_ps_data[NI_MAXHOST];
4078 
4079  /* Save port etc. for ps status */
4080  MyProcPort = port;
4081 
4082  /*
4083  * PreAuthDelay is a debugging aid for investigating problems in the
4084  * authentication cycle: it can be set in postgresql.conf to allow time to
4085  * attach to the newly-forked backend with a debugger. (See also
4086  * PostAuthDelay, which we allow clients to pass through PGOPTIONS, but it
4087  * is not honored until after authentication.)
4088  */
4089  if (PreAuthDelay > 0)
4090  pg_usleep(PreAuthDelay * 1000000L);
4091 
4092  /* This flag will remain set until InitPostgres finishes authentication */
4093  ClientAuthInProgress = true; /* limit visibility of log messages */
4094 
4095  /* save process start time */
4098 
4099  /* set these to empty in case they are needed before we set them up */
4100  port->remote_host = "";
4101  port->remote_port = "";
4102 
4103  /*
4104  * Initialize libpq and enable reporting of ereport errors to the client.
4105  * Must do this now because authentication uses libpq to send messages.
4106  */
4107  pq_init(); /* initialize libpq to talk to client */
4108  whereToSendOutput = DestRemote; /* now safe to ereport to client */
4109 
4110  /*
4111  * We arrange for a simple exit(1) if we receive SIGTERM or SIGQUIT or
4112  * timeout while trying to collect the startup packet. Otherwise the
4113  * postmaster cannot shutdown the database FAST or IMMED cleanly if a
4114  * buggy client fails to send the packet promptly. XXX it follows that
4115  * the remainder of this function must tolerate losing control at any
4116  * instant. Likewise, any pg_on_exit_callback registered before or during
4117  * this function must be prepared to execute at any instant between here
4118  * and the end of this function. Furthermore, affected callbacks execute
4119  * partially or not at all when a second exit-inducing signal arrives
4120  * after proc_exit_prepare() decrements on_proc_exit_index. (Thanks to
4121  * that mechanic, callbacks need not anticipate more than one call.) This
4122  * is fragile; it ought to instead follow the norm of handling interrupts
4123  * at selected, safe opportunities.
4124  */
4125  pqsignal(SIGTERM, startup_die);
4127  InitializeTimeouts(); /* establishes SIGALRM handler */
4129 
4130  /*
4131  * Get the remote host name and port for logging and status display.
4132  */
4133  remote_host[0] = '\0';
4134  remote_port[0] = '\0';
4135  if ((ret = pg_getnameinfo_all(&port->raddr.addr, port->raddr.salen,
4136  remote_host, sizeof(remote_host),
4137  remote_port, sizeof(remote_port),
4138  (log_hostname ? 0 : NI_NUMERICHOST) | NI_NUMERICSERV)) != 0)
4139  ereport(WARNING,
4140  (errmsg_internal("pg_getnameinfo_all() failed: %s",
4141  gai_strerror(ret))));
4142  if (remote_port[0] == '\0')
4143  snprintf(remote_ps_data, sizeof(remote_ps_data), "%s", remote_host);
4144  else
4145  snprintf(remote_ps_data, sizeof(remote_ps_data), "%s(%s)", remote_host, remote_port);
4146 
4147  /*
4148  * Save remote_host and remote_port in port structure (after this, they
4149  * will appear in log_line_prefix data for log messages).
4150  */
4151  port->remote_host = strdup(remote_host);
4152  port->remote_port = strdup(remote_port);
4153 
4154  /* And now we can issue the Log_connections message, if wanted */
4155  if (Log_connections)
4156  {
4157  if (remote_port[0])
4158  ereport(LOG,
4159  (errmsg("connection received: host=%s port=%s",
4160  remote_host,
4161  remote_port)));
4162  else
4163  ereport(LOG,
4164  (errmsg("connection received: host=%s",
4165  remote_host)));
4166  }
4167 
4168  /*
4169  * If we did a reverse lookup to name, we might as well save the results
4170  * rather than possibly repeating the lookup during authentication.
4171  *
4172  * Note that we don't want to specify NI_NAMEREQD above, because then we'd
4173  * get nothing useful for a client without an rDNS entry. Therefore, we
4174  * must check whether we got a numeric IPv4 or IPv6 address, and not save
4175  * it into remote_hostname if so. (This test is conservative and might
4176  * sometimes classify a hostname as numeric, but an error in that
4177  * direction is safe; it only results in a possible extra lookup.)
4178  */
4179  if (log_hostname &&
4180  ret == 0 &&
4181  strspn(remote_host, "0123456789.") < strlen(remote_host) &&
4182  strspn(remote_host, "0123456789ABCDEFabcdef:") < strlen(remote_host))
4183  port->remote_hostname = strdup(remote_host);
4184 
4185  /*
4186  * Ready to begin client interaction. We will give up and exit(1) after a
4187  * time delay, so that a broken client can't hog a connection
4188  * indefinitely. PreAuthDelay and any DNS interactions above don't count
4189  * against the time limit.
4190  *
4191  * Note: AuthenticationTimeout is applied here while waiting for the
4192  * startup packet, and then again in InitPostgres for the duration of any
4193  * authentication operations. So a hostile client could tie up the
4194  * process for nearly twice AuthenticationTimeout before we kick him off.
4195  *
4196  * Note: because PostgresMain will call InitializeTimeouts again, the
4197  * registration of STARTUP_PACKET_TIMEOUT will be lost. This is okay
4198  * since we never use it again after this function.
4199  */
4202 
4203  /*
4204  * Receive the startup packet (which might turn out to be a cancel request
4205  * packet).
4206  */
4207  status = ProcessStartupPacket(port, false);
4208 
4209  /*
4210  * Stop here if it was bad or a cancel packet. ProcessStartupPacket
4211  * already did any appropriate error reporting.
4212  */
4213  if (status != STATUS_OK)
4214  proc_exit(0);
4215 
4216  /*
4217  * Now that we have the user and database name, we can set the process
4218  * title for ps. It's good to do this as early as possible in startup.
4219  *
4220  * For a walsender, the ps display is set in the following form:
4221  *
4222  * postgres: wal sender process <user> <host> <activity>
4223  *
4224  * To achieve that, we pass "wal sender process" as username and username
4225  * as dbname to init_ps_display(). XXX: should add a new variant of
4226  * init_ps_display() to avoid abusing the parameters like this.
4227  */
4228  if (am_walsender)
4229  init_ps_display("wal sender process", port->user_name, remote_ps_data,
4230  update_process_title ? "authentication" : "");
4231  else
4232  init_ps_display(port->user_name, port->database_name, remote_ps_data,
4233  update_process_title ? "authentication" : "");
4234 
4235  /*
4236  * Disable the timeout, and prevent SIGTERM/SIGQUIT again.
4237  */
4239  PG_SETMASK(&BlockSig);
4240 }
void InitializeTimeouts(void)
Definition: timeout.c:340
static void startup_die(SIGNAL_ARGS)
Definition: postmaster.c:5096
#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:1569
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:128
#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:124
bool ClientAuthInProgress
Definition: postmaster.c:348
SockAddr raddr
Definition: libpq-be.h:122
bool am_walsender
Definition: walsender.c:108
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:151
#define NI_MAXSERV
Definition: getaddrinfo.h:93
pg_time_t timestamptz_to_time_t(TimestampTz t)
Definition: timestamp.c:1691
char * user_name
Definition: libpq-be.h:137
ACCEPT_TYPE_ARG3 salen
Definition: pqcomm.h:65
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:975
bool log_hostname
Definition: postmaster.c:238
static int port
Definition: pg_regress.c:89
#define WARNING
Definition: elog.h:40
static int ProcessStartupPacket(Port *port, bool SSLdone)
Definition: postmaster.c:1916
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:122
sigset_t StartupBlockSig
Definition: pqsignal.c:22
int PreAuthDelay
Definition: postmaster.c:235
char * remote_host
Definition: libpq-be.h:123
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void StartupPacketTimeoutHandler(void)
Definition: postmaster.c:5120
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:224
char * database_name
Definition: libpq-be.h:136
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 4251 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().

4252 {
4253  char **av;
4254  int maxac;
4255  int ac;
4256  long secs;
4257  int usecs;
4258  int i;
4259 
4260  /*
4261  * Don't want backend to be able to see the postmaster random number
4262  * generator state. We have to clobber the static random_seed *and* start
4263  * a new random sequence in the random() library function.
4264  */
4265 #ifndef HAVE_STRONG_RANDOM
4266  random_seed = 0;
4267  random_start_time.tv_usec = 0;
4268 #endif
4269  /* slightly hacky way to convert timestamptz into integers */
4270  TimestampDifference(0, port->SessionStartTime, &secs, &usecs);
4271  srandom((unsigned int) (MyProcPid ^ (usecs << 12) ^ secs));
4272 
4273  /*
4274  * Now, build the argv vector that will be given to PostgresMain.
4275  *
4276  * The maximum possible number of commandline arguments that could come
4277  * from ExtraOptions is (strlen(ExtraOptions) + 1) / 2; see
4278  * pg_split_opts().
4279  */
4280  maxac = 2; /* for fixed args supplied below */
4281  maxac += (strlen(ExtraOptions) + 1) / 2;
4282 
4283  av = (char **) MemoryContextAlloc(TopMemoryContext,
4284  maxac * sizeof(char *));
4285  ac = 0;
4286 
4287  av[ac++] = "postgres";
4288 
4289  /*
4290  * Pass any backend switches specified with -o on the postmaster's own
4291  * command line. We assume these are secure.
4292  */
4293  pg_split_opts(av, &ac, ExtraOptions);
4294 
4295  av[ac] = NULL;
4296 
4297  Assert(ac < maxac);
4298 
4299  /*
4300  * Debug: print arguments being passed to backend
4301  */
4302  ereport(DEBUG3,
4303  (errmsg_internal("%s child[%d]: starting with (",
4304  progname, (int) getpid())));
4305  for (i = 0; i < ac; ++i)
4306  ereport(DEBUG3,
4307  (errmsg_internal("\t%s", av[i])));
4308  ereport(DEBUG3,
4309  (errmsg_internal(")")));
4310 
4311  /*
4312  * Make sure we aren't in PostmasterContext anymore. (We can't delete it
4313  * just yet, though, because InitPostgres will need the HBA data.)
4314  */
4316 
4317  PostgresMain(ac, av, port->database_name, port->user_name);
4318 }
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:151
void PostgresMain(int argc, char *argv[], const char *dbname, const char *username)
Definition: postgres.c:3563
void pg_split_opts(char **argv, int *argcp, const char *optstr)
Definition: postinit.c:436
char * user_name
Definition: libpq-be.h:137
#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:229
static char ExtraOptions[MAXPGPATH]
Definition: postmaster.c:220
#define Assert(condition)
Definition: c.h:675
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:707
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:1623
char * database_name
Definition: libpq-be.h:136
static struct timeval random_start_time
Definition: postmaster.c:370
static int BackendStartup ( Port port)
static

Definition at line 3921 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().

3922 {
3923  Backend *bn; /* for backend cleanup */
3924  pid_t pid;
3925 
3926  /*
3927  * Create backend data structure. Better before the fork() so we can
3928  * handle failure cleanly.
3929  */
3930  bn = (Backend *) malloc(sizeof(Backend));
3931  if (!bn)
3932  {
3933  ereport(LOG,
3934  (errcode(ERRCODE_OUT_OF_MEMORY),
3935  errmsg("out of memory")));
3936  return STATUS_ERROR;
3937  }
3938 
3939  /*
3940  * Compute the cancel key that will be assigned to this backend. The
3941  * backend will have its own copy in the forked-off process' value of
3942  * MyCancelKey, so that it can transmit the key to the frontend.
3943  */
3945  {
3946  free(bn);
3947  ereport(LOG,
3948  (errcode(ERRCODE_INTERNAL_ERROR),
3949  errmsg("could not generate random cancel key")));
3950  return STATUS_ERROR;
3951  }
3952 
3953  bn->cancel_key = MyCancelKey;
3954 
3955  /* Pass down canAcceptConnections state */
3957  bn->dead_end = (port->canAcceptConnections != CAC_OK &&
3959 
3960  /*
3961  * Unless it's a dead_end child, assign it a child slot number
3962  */
3963  if (!bn->dead_end)
3965  else
3966  bn->child_slot = 0;
3967 
3968  /* Hasn't asked to be notified about any bgworkers yet */
3969  bn->bgworker_notify = false;
3970 
3971 #ifdef EXEC_BACKEND
3972  pid = backend_forkexec(port);
3973 #else /* !EXEC_BACKEND */
3974  pid = fork_process();
3975  if (pid == 0) /* child */
3976  {
3977  free(bn);
3978 
3979  /* Detangle from postmaster */
3981 
3982  /* Close the postmaster's sockets */
3983  ClosePostmasterPorts(false);
3984 
3985  /* Perform additional initialization and collect startup packet */
3986  BackendInitialize(port);
3987 
3988  /* And run the backend */
3989  BackendRun(port);
3990  }
3991 #endif /* EXEC_BACKEND */
3992 
3993  if (pid < 0)
3994  {
3995  /* in parent, fork failed */
3996  int save_errno = errno;
3997 
3998  if (!bn->dead_end)
4000  free(bn);
4001  errno = save_errno;
4002  ereport(LOG,
4003  (errmsg("could not fork new process for connection: %m")));
4004  report_fork_failure_to_client(port, save_errno);
4005  return STATUS_ERROR;
4006  }
4007 
4008  /* in parent, successful fork */
4009  ereport(DEBUG2,
4010  (errmsg_internal("forked new backend, pid=%d socket=%d",
4011  (int) pid, (int) port->sock)));
4012 
4013  /*
4014  * Everything's been successful, it's safe to add this backend to our list
4015  * of backends.
4016  */
4017  bn->pid = pid;
4018  bn->bkend_type = BACKEND_TYPE_NORMAL; /* Can change later to WALSND */
4020 
4021 #ifdef EXEC_BACKEND
4022  if (!bn->dead_end)
4023  ShmemBackendArrayAdd(bn);
4024 #endif
4025 
4026  return STATUS_OK;
4027 }
CAC_state canAcceptConnections
Definition: libpq-be.h:129
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:4251
pid_t fork_process(void)
Definition: fork_process.c:31
int errcode(int sqlerrcode)
Definition: elog.c:575
#define STATUS_ERROR
Definition: c.h:976
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:2421
pgsocket sock
Definition: libpq-be.h:118
bool bgworker_notify
Definition: postmaster.c:179
int AssignPostmasterChildSlot(void)
Definition: pmsignal.c:151
#define malloc(a)
Definition: header.h:50
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:4038
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:975
static bool RandomCancelKey(int32 *cancel_key)
Definition: postmaster.c:5130
int child_slot
Definition: postmaster.c:170
int bkend_type
Definition: postmaster.c:177
#define free(a)
Definition: header.h:65
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:2299
static void BackendInitialize(Port *port)
Definition: postmaster.c:4071
void BackgroundWorkerBlockSignals ( void  )

Definition at line 5498 of file postmaster.c.

References BlockSig, and PG_SETMASK.

5499 {
5500  PG_SETMASK(&BlockSig);
5501 }
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
sigset_t BlockSig
Definition: pqsignal.c:22
void BackgroundWorkerInitializeConnection ( char *  dbname,
char *  username 
)

Definition at line 5452 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().

5453 {
5455 
5456  /* XXX is this the right errcode? */
5458  ereport(FATAL,
5459  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
5460  errmsg("database connection requirement not indicated during registration")));
5461 
5463 
5464  /* it had better not gotten out of "init" mode yet */
5465  if (!IsInitProcessingMode())
5466  ereport(ERROR,
5467  (errmsg("invalid processing mode in background worker")));
5469 }
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:131
#define InvalidOid
Definition: postgres_ext.h:36
#define NULL
Definition: c.h:229
#define BGWORKER_BACKEND_DATABASE_CONNECTION
Definition: bgworker.h:59
char * dbname
Definition: streamutil.c:38
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 5475 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().

5476 {
5478 
5479  /* XXX is this the right errcode? */
5481  ereport(FATAL,
5482  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
5483  errmsg("database connection requirement not indicated during registration")));
5484 
5485  InitPostgres(NULL, dboid, NULL, useroid, NULL);
5486 
5487  /* it had better not gotten out of "init" mode yet */
5488  if (!IsInitProcessingMode())
5489  ereport(ERROR,
5490  (errmsg("invalid processing mode in background worker")));
5492 }
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:229
#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 5504 of file postmaster.c.

References PG_SETMASK, and UnBlockSig.

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

5505 {
5507 }
#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 5593 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().

5594 {
5595  switch (pmState)
5596  {
5597  case PM_NO_CHILDREN:
5598  case PM_WAIT_DEAD_END:
5599  case PM_SHUTDOWN_2:
5600  case PM_SHUTDOWN:
5601  case PM_WAIT_BACKENDS:
5602  case PM_WAIT_READONLY:
5603  case PM_WAIT_BACKUP:
5604  break;
5605 
5606  case PM_RUN:
5608  return true;
5609  /* fall through */
5610 
5611  case PM_HOT_STANDBY:
5613  return true;
5614  /* fall through */
5615 
5616  case PM_RECOVERY:
5617  case PM_STARTUP:
5618  case PM_INIT:
5620  return true;
5621  /* fall through */
5622 
5623  }
5624 
5625  return false;
5626 }
static time_t start_time
Definition: pg_ctl.c:91
static PMState pmState
Definition: postmaster.c:338
static CAC_state canAcceptConnections ( void  )
static

Definition at line 2299 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, result, and Shutdown.

Referenced by BackendStartup(), and StartAutovacuumWorker().

2300 {
2302 
2303  /*
2304  * Can't start backends when in startup/shutdown/inconsistent recovery
2305  * state.
2306  *
2307  * In state PM_WAIT_BACKUP only superusers can connect (this must be
2308  * allowed so that a superuser can end online backup mode); we return
2309  * CAC_WAITBACKUP code to indicate that this must be checked later. Note
2310  * that neither CAC_OK nor CAC_WAITBACKUP can safely be returned until we
2311  * have checked for too many children.
2312  */
2313  if (pmState != PM_RUN)
2314  {
2315  if (pmState == PM_WAIT_BACKUP)
2316  result = CAC_WAITBACKUP; /* allow superusers only */
2317  else if (Shutdown > NoShutdown)
2318  return CAC_SHUTDOWN; /* shutdown is pending */
2319  else if (!FatalError &&
2320  (pmState == PM_STARTUP ||
2321  pmState == PM_RECOVERY))
2322  return CAC_STARTUP; /* normal startup */
2323  else if (!FatalError &&
2325  result = CAC_OK; /* connection OK during hot standby */
2326  else
2327  return CAC_RECOVERY; /* else must be crash recovery */
2328  }
2329 
2330  /*
2331  * Don't start too many children.
2332  *
2333  * We allow more connections than we can have backends here because some
2334  * might still be authenticating; they might fail auth, or some existing
2335  * backend might exit before the auth cycle is completed. The exact
2336  * MaxBackends limit is enforced when a new backend tries to join the
2337  * shared-inval backend array.
2338  *
2339  * The limit here must match the sizes of the per-child-process arrays;
2340  * see comments for MaxLivePostmasterChildren().
2341  */
2343  result = CAC_TOOMANY;
2344 
2345  return result;
2346 }
#define BACKEND_TYPE_ALL
Definition: postmaster.c:146
return result
Definition: formatting.c:1618
static bool FatalError
Definition: postmaster.c:276
static int Shutdown
Definition: postmaster.c:274
static int CountChildren(int target)
Definition: postmaster.c:5170
static PMState pmState
Definition: postmaster.c:338
int MaxLivePostmasterChildren(void)
Definition: postmaster.c:5442
#define NoShutdown
Definition: postmaster.c:269
CAC_state
Definition: libpq-be.h:71
static void checkDataDir ( void  )
static

Definition at line 1451 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().

1452 {
1453  char path[MAXPGPATH];
1454  FILE *fp;
1455  struct stat stat_buf;
1456 
1457  Assert(DataDir);
1458 
1459  if (stat(DataDir, &stat_buf) != 0)
1460  {
1461  if (errno == ENOENT)
1462  ereport(FATAL,
1464  errmsg("data directory \"%s\" does not exist",
1465  DataDir)));
1466  else
1467  ereport(FATAL,
1469  errmsg("could not read permissions of directory \"%s\": %m",
1470  DataDir)));
1471  }
1472 
1473  /* eventual chdir would fail anyway, but let's test ... */
1474  if (!S_ISDIR(stat_buf.st_mode))
1475  ereport(FATAL,
1476  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1477  errmsg("specified data directory \"%s\" is not a directory",
1478  DataDir)));
1479 
1480  /*
1481  * Check that the directory belongs to my userid; if not, reject.
1482  *
1483  * This check is an essential part of the interlock that prevents two
1484  * postmasters from starting in the same directory (see CreateLockFile()).
1485  * Do not remove or weaken it.
1486  *
1487  * XXX can we safely enable this check on Windows?
1488  */
1489 #if !defined(WIN32) && !defined(__CYGWIN__)
1490  if (stat_buf.st_uid != geteuid())
1491  ereport(FATAL,
1492  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1493  errmsg("data directory \"%s\" has wrong ownership",
1494  DataDir),
1495  errhint("The server must be started by the user that owns the data directory.")));
1496 #endif
1497 
1498  /*
1499  * Check if the directory has group or world access. If so, reject.
1500  *
1501  * It would be possible to allow weaker constraints (for example, allow
1502  * group access) but we cannot make a general assumption that that is
1503  * okay; for example there are platforms where nearly all users
1504  * customarily belong to the same group. Perhaps this test should be
1505  * configurable.
1506  *
1507  * XXX temporarily suppress check when on Windows, because there may not
1508  * be proper support for Unix-y file permissions. Need to think of a
1509  * reasonable check to apply on Windows.
1510  */
1511 #if !defined(WIN32) && !defined(__CYGWIN__)
1512  if (stat_buf.st_mode & (S_IRWXG | S_IRWXO))
1513  ereport(FATAL,
1514  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1515  errmsg("data directory \"%s\" has group or world access",
1516  DataDir),
1517  errdetail("Permissions should be u=rwx (0700).")));
1518 #endif
1519 
1520  /* Look for PG_VERSION before looking for pg_control */
1522 
1523  snprintf(path, sizeof(path), "%s/global/pg_control", DataDir);
1524 
1525  fp = AllocateFile(path, PG_BINARY_R);
1526  if (fp == NULL)
1527  {
1528  write_stderr("%s: could not find the database system\n"
1529  "Expected to find it in the directory \"%s\",\n"
1530  "but could not open file \"%s\": %s\n",
1531  progname, DataDir, path, strerror(errno));
1532  ExitPostmaster(2);
1533  }
1534  FreeFile(fp);
1535 }
int errhint(const char *fmt,...)
Definition: elog.c:987
void ValidatePgVersion(const char *path)
Definition: miscinit.c:1349
#define write_stderr(str)
Definition: parallel.c:180
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:1040
struct stat stat_buf
Definition: pg_standby.c:101
static void ExitPostmaster(int status) pg_attribute_noreturn()
Definition: postmaster.c:4910
#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:2094
#define ereport(elevel, rest)
Definition: elog.h:122
#define S_IRWXO
Definition: win32.h:484
#define NULL
Definition: c.h:229
#define Assert(condition)
Definition: c.h:675
#define S_IRWXG
Definition: win32.h:480
int FreeFile(FILE *file)
Definition: fd.c:2277
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 3155 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().

3157 {
3158  dlist_mutable_iter iter;
3159 
3160  LogChildExit(DEBUG2, _("server process"), pid, exitstatus);
3161 
3162  /*
3163  * If a backend dies in an ugly way then we must signal all other backends
3164  * to quickdie. If exit status is zero (normal) or one (FATAL exit), we
3165  * assume everything is all right and proceed to remove the backend from
3166  * the active backend list.
3167  */
3168 
3169 #ifdef WIN32
3170 
3171  /*
3172  * On win32, also treat ERROR_WAIT_NO_CHILDREN (128) as nonfatal case,
3173  * since that sometimes happens under load when the process fails to start
3174  * properly (long before it starts using shared memory). Microsoft reports
3175  * it is related to mutex failure:
3176  * http://archives.postgresql.org/pgsql-hackers/2010-09/msg00790.php
3177  */
3178  if (exitstatus == ERROR_WAIT_NO_CHILDREN)
3179  {
3180  LogChildExit(LOG, _("server process"), pid, exitstatus);
3181  exitstatus = 0;
3182  }
3183 #endif
3184 
3185  if (!EXIT_STATUS_0(exitstatus) && !EXIT_STATUS_1(exitstatus))
3186  {
3187  HandleChildCrash(pid, exitstatus, _("server process"));
3188  return;
3189  }
3190 
3192  {
3193  Backend *bp = dlist_container(Backend, elem, iter.cur);
3194 
3195  if (bp->pid == pid)
3196  {
3197  if (!bp->dead_end)
3198  {
3200  {
3201  /*
3202  * Uh-oh, the child failed to clean itself up. Treat as a
3203  * crash after all.
3204  */
3205  HandleChildCrash(pid, exitstatus, _("server process"));
3206  return;
3207  }
3208 #ifdef EXEC_BACKEND
3209  ShmemBackendArrayRemove(bp);
3210 #endif
3211  }
3212  if (bp->bgworker_notify)
3213  {
3214  /*
3215  * This backend may have been slated to receive SIGUSR1 when
3216  * some background worker started or stopped. Cancel those
3217  * notifications, as we don't want to signal PIDs that are not
3218  * PostgreSQL backends. This gets skipped in the (probably
3219  * very common) case where the backend has never requested any
3220  * such notifications.
3221  */
3223  }
3224  dlist_delete(iter.cur);
3225  free(bp);
3226  break;
3227  }
3228  }
3229 }
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:473
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:65
pid_t pid
Definition: postmaster.c:168
static void HandleChildCrash(int pid, int exitstatus, const char *procname)
Definition: postmaster.c:3239
static void LogChildExit(int lev, const char *procname, int pid, int exitstatus)
Definition: postmaster.c:3495
#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 3056 of file postmaster.c.

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

Referenced by reaper().

3058 {
3059  char namebuf[MAXPGPATH];
3060  slist_mutable_iter iter;
3061 
3063  {
3064  RegisteredBgWorker *rw;
3065 
3066  rw = slist_container(RegisteredBgWorker, rw_lnode, iter.cur);
3067 
3068  if (rw->rw_pid != pid)
3069  continue;
3070 
3071 #ifdef WIN32
3072  /* see CleanupBackend */
3073  if (exitstatus == ERROR_WAIT_NO_CHILDREN)
3074  exitstatus = 0;
3075 #endif
3076 
3077  snprintf(namebuf, MAXPGPATH, "%s: %s", _("worker process"),
3078  rw->rw_worker.bgw_name);
3079 
3080  if (!EXIT_STATUS_0(exitstatus))
3081  {
3082  /* Record timestamp, so we know when to restart the worker. */
3084  }
3085  else
3086  {
3087  /* Zero exit status means terminate */
3088  rw->rw_crashed_at = 0;
3089  rw->rw_terminate = true;
3090  }
3091 
3092  /*
3093  * Additionally, for shared-memory-connected workers, just like a
3094  * backend, any exit status other than 0 or 1 is considered a crash
3095  * and causes a system-wide restart.
3096  */
3097  if ((rw->rw_worker.bgw_flags & BGWORKER_SHMEM_ACCESS) != 0)
3098  {
3099  if (!EXIT_STATUS_0(exitstatus) && !EXIT_STATUS_1(exitstatus))
3100  {
3101  HandleChildCrash(pid, exitstatus, namebuf);
3102  return true;
3103  }
3104  }
3105 
3106  /*
3107  * We must release the postmaster child slot whether this worker is
3108  * connected to shared memory or not, but we only treat it as a crash
3109  * if it is in fact connected.
3110  */
3113  {
3114  HandleChildCrash(pid, exitstatus, namebuf);
3115  return true;
3116  }
3117 
3118  /* Get it out of the BackendList and clear out remaining data */
3119  dlist_delete(&rw->rw_backend->elem);
3120 #ifdef EXEC_BACKEND
3121  ShmemBackendArrayRemove(rw->rw_backend);
3122 #endif
3123 
3124  /*
3125  * It's possible that this background worker started some OTHER
3126  * background worker and asked to be notified when that worker started
3127  * or stopped. If so, cancel any notifications destined for the
3128  * now-dead backend.
3129  */
3130  if (rw->rw_backend->bgworker_notify)
3132  free(rw->rw_backend);
3133  rw->rw_backend = NULL;
3134  rw->rw_pid = 0;
3135  rw->rw_child_slot = 0;
3136  ReportBackgroundWorkerExit(&iter); /* report child death */
3137 
3138  LogChildExit(EXIT_STATUS_0(exitstatus) ? DEBUG1 : LOG,
3139  namebuf, pid, exitstatus);
3140 
3141  return true;
3142  }
3143 
3144  return false;
3145 }
struct bkend * rw_backend
#define DEBUG1
Definition: elog.h:25
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1569
slist_node * cur
Definition: ilist.h:241
void ReportBackgroundWorkerExit(slist_mutable_iter *cur)
Definition: bgworker.c:439
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:473
bool bgworker_notify
Definition: postmaster.c:179
#define slist_foreach_modify(iter, lhead)
Definition: ilist.h:716
#define EXIT_STATUS_1(st)
Definition: postmaster.c:548
#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:65
#define NULL
Definition: c.h:229
char bgw_name[BGW_MAXLEN]
Definition: bgworker.h:90
static void HandleChildCrash(int pid, int exitstatus, const char *procname)
Definition: postmaster.c:3239
static void LogChildExit(int lev, const char *procname, int pid, int exitstatus)
Definition: postmaster.c:3495
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 2421 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().

2422 {
2423  int i;
2424 
2425 #ifndef WIN32
2426 
2427  /*
2428  * Close the write end of postmaster death watch pipe. It's important to
2429  * do this as early as possible, so that if postmaster dies, others won't
2430  * think that it's still running because we're holding the pipe open.
2431  */
2433  ereport(FATAL,
2435  errmsg_internal("could not close postmaster death monitoring pipe in child process: %m")));
2437 #endif
2438 
2439  /* Close the listen sockets */
2440  for (i = 0; i < MAXLISTEN; i++)
2441  {
2442  if (ListenSocket[i] != PGINVALID_SOCKET)
2443  {
2446  }
2447  }
2448 
2449  /* If using syslogger, close the read side of the pipe */
2450  if (!am_syslogger)
2451  {
2452 #ifndef WIN32
2453  if (syslogPipe[0] >= 0)
2454  close(syslogPipe[0]);
2455  syslogPipe[0] = -1;
2456 #else
2457  if (syslogPipe[0])
2458  CloseHandle(syslogPipe[0]);
2459  syslogPipe[0] = 0;
2460 #endif
2461  }
2462 
2463 #ifdef USE_BONJOUR
2464  /* If using Bonjour, close the connection to the mDNS daemon */
2465  if (bonjour_sdref)
2466  close(DNSServiceRefSockFD(bonjour_sdref));
2467 #endif
2468 }
void StreamClose(pgsocket sock)
Definition: pqcomm.c:825
#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 1352 of file postmaster.c.

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

Referenced by PostmasterMain().

1353 {
1354  int i;
1355 
1356  /*
1357  * First, explicitly close all the socket FDs. We used to just let this
1358  * happen implicitly at postmaster exit, but it's better to close them
1359  * before we remove the postmaster.pid lockfile; otherwise there's a race
1360  * condition if a new postmaster wants to re-use the TCP port number.
1361  */
1362  for (i = 0; i < MAXLISTEN; i++)
1363  {
1364  if (ListenSocket[i] != PGINVALID_SOCKET)
1365  {
1368  }
1369  }
1370 
1371  /*
1372  * Next, remove any filesystem entries for Unix sockets. To avoid race
1373  * conditions against incoming postmasters, this must happen after closing
1374  * the sockets and before removing lock files.
1375  */
1377 
1378  /*
1379  * We don't do anything about socket lock files here; those will be
1380  * removed in a later on_proc_exit callback.
1381  */
1382 }
void StreamClose(pgsocket sock)
Definition: pqcomm.c:825
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
#define PGINVALID_SOCKET
Definition: port.h:24
int i
void RemoveSocketFiles(void)
Definition: pqcomm.c:870
#define MAXLISTEN
Definition: postmaster.c:214
static Port * ConnCreate ( int  serverFd)
static

Definition at line 2355 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().

2356 {
2357  Port *port;
2358 
2359  if (!(port = (Port *) calloc(1, sizeof(Port))))
2360  {
2361  ereport(LOG,
2362  (errcode(ERRCODE_OUT_OF_MEMORY),
2363  errmsg("out of memory")));
2364  ExitPostmaster(1);
2365  }
2366 
2367  if (StreamConnection(serverFd, port) != STATUS_OK)
2368  {
2369  if (port->sock != PGINVALID_SOCKET)
2370  StreamClose(port->sock);
2371  ConnFree(port);
2372  return NULL;
2373  }
2374 
2375  /*
2376  * Allocate GSSAPI specific state struct
2377  */
2378 #ifndef EXEC_BACKEND
2379 #if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
2380  port->gss = (pg_gssinfo *) calloc(1, sizeof(pg_gssinfo));
2381  if (!port->gss)
2382  {
2383  ereport(LOG,
2384  (errcode(ERRCODE_OUT_OF_MEMORY),
2385  errmsg("out of memory")));
2386  ExitPostmaster(1);
2387  }
2388 #endif
2389 #endif
2390 
2391  return port;
2392 }
#define calloc(a, b)
Definition: header.h:55
void StreamClose(pgsocket sock)
Definition: pqcomm.c:825
static void ConnFree(Port *port)
Definition: postmaster.c:2399
int errcode(int sqlerrcode)
Definition: elog.c:575
Definition: libpq-be.h:116
#define LOG
Definition: elog.h:26
int StreamConnection(pgsocket server_fd, Port *port)
Definition: pqcomm.c:697
pgsocket sock
Definition: libpq-be.h:118
static void ExitPostmaster(int status) pg_attribute_noreturn()
Definition: postmaster.c:4910
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:975
static int port
Definition: pg_regress.c:89
#define PGINVALID_SOCKET
Definition: port.h:24
#define NULL
Definition: c.h:229
void * gss
Definition: libpq-be.h:175
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void ConnFree ( Port port)
static

Definition at line 2399 of file postmaster.c.

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

Referenced by ConnCreate(), and ServerLoop().

2400 {
2401 #ifdef USE_SSL
2402  secure_close(conn);
2403 #endif
2404  if (conn->gss)
2405  free(conn->gss);
2406  free(conn);
2407 }
PGconn * conn
Definition: streamutil.c:42
#define free(a)
Definition: header.h:65
void secure_close(Port *port)
Definition: be-secure.c:125
static int CountChildren ( int  target)
static

Definition at line 5170 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().

5171 {
5172  dlist_iter iter;
5173  int cnt = 0;
5174 
5175  dlist_foreach(iter, &BackendList)
5176  {
5177  Backend *bp = dlist_container(Backend, elem, iter.cur);
5178 
5179  if (bp->dead_end)
5180  continue;
5181 
5182  /*
5183  * Since target == BACKEND_TYPE_ALL is the most common case, we test
5184  * it first and avoid touching shared memory for every child.
5185  */
5186  if (target != BACKEND_TYPE_ALL)
5187  {
5188  /*
5189  * Assign bkend_type for any recently announced WAL Sender
5190  * processes.
5191  */
5192  if (bp->bkend_type == BACKEND_TYPE_NORMAL &&
5195 
5196  if (!(target & bp->bkend_type))
5197  continue;
5198  }
5199 
5200  cnt++;
5201  }
5202  return cnt;
5203 }
#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 5402 of file postmaster.c.

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

Referenced by PostmasterMain().

5403 {
5404  FILE *fp;
5405  int i;
5406 
5407 #define OPTS_FILE "postmaster.opts"
5408 
5409  if ((fp = fopen(OPTS_FILE, "w")) == NULL)
5410  {
5411  elog(LOG, "could not create file \"%s\": %m", OPTS_FILE);
5412  return false;
5413  }
5414 
5415  fprintf(fp, "%s", fullprogname);
5416  for (i = 1; i < argc; i++)
5417  fprintf(fp, " \"%s\"", argv[i]);
5418  fputs("\n", fp);
5419 
5420  if (fclose(fp))
5421  {
5422  elog(LOG, "could not write file \"%s\": %m", OPTS_FILE);
5423  return false;
5424  }
5425 
5426  return true;
5427 }
#define LOG
Definition: elog.h:26
#define NULL
Definition: c.h:229
int i
#define elog
Definition: elog.h:219
#define OPTS_FILE
static void DetermineSleepTime ( struct timeval *  timeout)
static

Definition at line 1547 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().

1548 {
1549  TimestampTz next_wakeup = 0;
1550 
1551  /*
1552  * Normal case: either there are no background workers at all, or we're in
1553  * a shutdown sequence (during which we ignore bgworkers altogether).
1554  */
1555  if (Shutdown > NoShutdown ||
1557  {
1558  if (AbortStartTime != 0)
1559  {
1560  /* time left to abort; clamp to 0 in case it already expired */
1561  timeout->tv_sec = SIGKILL_CHILDREN_AFTER_SECS -
1562  (time(NULL) - AbortStartTime);
1563  timeout->tv_sec = Max(timeout->tv_sec, 0);
1564  timeout->tv_usec = 0;
1565  }
1566  else
1567  {
1568  timeout->tv_sec = 60;
1569  timeout->tv_usec = 0;
1570  }
1571  return;
1572  }
1573 
1574  if (StartWorkerNeeded)
1575  {
1576  timeout->tv_sec = 0;
1577  timeout->tv_usec = 0;
1578  return;
1579  }
1580 
1581  if (HaveCrashedWorker)
1582  {
1583  slist_mutable_iter siter;
1584 
1585  /*
1586  * When there are crashed bgworkers, we sleep just long enough that
1587  * they are restarted when they request to be. Scan the list to
1588  * determine the minimum of all wakeup times according to most recent
1589  * crash time and requested restart interval.
1590  */
1592  {
1593  RegisteredBgWorker *rw;
1594  TimestampTz this_wakeup;
1595 
1596  rw = slist_container(RegisteredBgWorker, rw_lnode, siter.cur);
1597 
1598  if (rw->rw_crashed_at == 0)
1599  continue;
1600 
1602  || rw->rw_terminate)
1603  {
1604  ForgetBackgroundWorker(&siter);
1605  continue;
1606  }
1607 
1608  this_wakeup = TimestampTzPlusMilliseconds(rw->rw_crashed_at,
1609  1000L * rw->rw_worker.bgw_restart_time);
1610  if (next_wakeup == 0 || this_wakeup < next_wakeup)
1611  next_wakeup = this_wakeup;
1612  }
1613  }
1614 
1615  if (next_wakeup != 0)
1616  {
1617  long secs;
1618  int microsecs;
1619 
1621  &secs, &microsecs);
1622  timeout->tv_sec = secs;
1623  timeout->tv_usec = microsecs;
1624 
1625  /* Ensure we don't exceed one minute */
1626  if (timeout->tv_sec > 60)
1627  {
1628  timeout->tv_sec = 60;
1629  timeout->tv_usec = 0;
1630  }
1631  }
1632  else
1633  {
1634  timeout->tv_sec = 60;
1635  timeout->tv_usec = 0;
1636  }
1637 }
static volatile bool StartWorkerNeeded
Definition: postmaster.c:360
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1569
int64 TimestampTz
Definition: timestamp.h:39
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
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:56
#define SIGKILL_CHILDREN_AFTER_SECS
Definition: postmaster.c:344
#define Max(x, y)
Definition: c.h:800
#define NULL
Definition: c.h:229
#define NoShutdown
Definition: postmaster.c:269
BackgroundWorker rw_worker
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1623
static time_t AbortStartTime
Definition: postmaster.c:342
static void do_start_bgworker ( RegisteredBgWorker rw)
static

Definition at line 5537 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().

5538 {
5539  pid_t worker_pid;
5540 
5541  ereport(DEBUG1,
5542  (errmsg("starting background worker process \"%s\"",
5543  rw->rw_worker.bgw_name)));
5544 
5545 #ifdef EXEC_BACKEND
5546  switch ((worker_pid = bgworker_forkexec(rw->rw_shmem_slot)))
5547 #else
5548  switch ((worker_pid = fork_process()))
5549 #endif
5550  {
5551  case -1:
5552  ereport(LOG,
5553  (errmsg("could not fork worker process: %m")));
5554  return;
5555 
5556 #ifndef EXEC_BACKEND
5557  case 0:
5558  /* in postmaster child ... */
5560 
5561  /* Close the postmaster's sockets */
5562  ClosePostmasterPorts(false);
5563 
5564  /*
5565  * Before blowing away PostmasterContext, save this bgworker's
5566  * data where it can find it.
5567  */
5570  memcpy(MyBgworkerEntry, &rw->rw_worker, sizeof(BackgroundWorker));
5571 
5572  /* Release postmaster's working memory context */
5576 
5578  break;
5579 #endif
5580  default:
5581  rw->rw_pid = worker_pid;
5582  rw->rw_backend->pid = rw->rw_pid;
5584  break;
5585  }
5586 }
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:2421
void StartBackgroundWorker(void)
Definition: bgworker.c:646
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:229
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:707
BackgroundWorker rw_worker
MemoryContext PostmasterContext
Definition: mcxt.c:45
static void dummy_handler ( SIGNAL_ARGS  )
static

Definition at line 5111 of file postmaster.c.

Referenced by PostmasterMain().

5112 {
5113 }
static void ExitPostmaster ( int  status)
static

Definition at line 4910 of file postmaster.c.

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

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

4911 {
4912 #ifdef HAVE_PTHREAD_IS_THREADED_NP
4913 
4914  /*
4915  * There is no known cause for a postmaster to become multithreaded after
4916  * startup. Recheck to account for the possibility of unknown causes.
4917  * This message uses LOG level, because an unclean shutdown at this point
4918  * would usually not look much different from a clean shutdown.
4919  */
4920  if (pthread_is_threaded_np() != 0)
4921  ereport(LOG,
4922  (errcode(ERRCODE_INTERNAL_ERROR),
4923  errmsg_internal("postmaster became multithreaded"),
4924  errdetail("Please report this to <pgsql-bugs@postgresql.org>.")));
4925 #endif
4926 
4927  /* should cleanup shared memory and kill all backends */
4928 
4929  /*
4930  * Not sure of the semantics here. When the Postmaster dies, should the
4931  * backends all be killed? probably not.
4932  *
4933  * MUST -- vadim 05-10-1999
4934  */
4935 
4936  proc_exit(status);
4937 }
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:224
static void getInstallationPaths ( const char *  argv0)
static

Definition at line 1400 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().

1401 {
1402  DIR *pdir;
1403 
1404  /* Locate the postgres executable itself */
1405  if (find_my_exec(argv0, my_exec_path) < 0)
1406  elog(FATAL, "%s: could not locate my own executable path", argv0);
1407 
1408 #ifdef EXEC_BACKEND
1409  /* Locate executable backend before we change working directory */
1410  if (find_other_exec(argv0, "postgres", PG_BACKEND_VERSIONSTR,
1411  postgres_exec_path) < 0)
1412  ereport(FATAL,
1413  (errmsg("%s: could not locate matching postgres executable",
1414  argv0)));
1415 #endif
1416 
1417  /*
1418  * Locate the pkglib directory --- this has to be set early in case we try
1419  * to load any modules from it in response to postgresql.conf entries.
1420  */
1422 
1423  /*
1424  * Verify that there's a readable directory there; otherwise the Postgres
1425  * installation is incomplete or corrupt. (A typical cause of this
1426  * failure is that the postgres executable has been moved or hardlinked to
1427  * some directory that's not a sibling of the installation lib/
1428  * directory.)
1429  */
1430  pdir = AllocateDir(pkglib_path);
1431  if (pdir == NULL)
1432  ereport(ERROR,
1434  errmsg("could not open directory \"%s\": %m",
1435  pkglib_path),
1436  errhint("This may indicate an incomplete PostgreSQL installation, or that the file \"%s\" has been moved away from its proper location.",
1437  my_exec_path)));
1438  FreeDir(pdir);
1439 
1440  /*
1441  * XXX is it worth similarly checking the share/ directory? If the lib/
1442  * directory is there, then share/ probably is too.
1443  */
1444 }
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:89
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:2335
#define ereport(elevel, rest)
Definition: elog.h:122
char my_exec_path[MAXPGPATH]
Definition: globals.c:63
#define NULL
Definition: c.h:229
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:2444
static void HandleChildCrash ( int  pid,
int  exitstatus,
const char *  procname 
)
static

Definition at line 3239 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().

3240 {
3241  dlist_mutable_iter iter;
3242  slist_iter siter;
3243  Backend *bp;
3244  bool take_action;
3245 
3246  /*
3247  * We only log messages and send signals if this is the first process
3248  * crash and we're not doing an immediate shutdown; otherwise, we're only
3249  * here to update postmaster's idea of live processes. If we have already
3250  * signalled children, nonzero exit status is to be expected, so don't
3251  * clutter log.
3252  */
3253  take_action = !FatalError && Shutdown != ImmediateShutdown;
3254 
3255  if (take_action)
3256  {
3257  LogChildExit(LOG, procname, pid, exitstatus);
3258  ereport(LOG,
3259  (errmsg("terminating any other active server processes")));
3260  }
3261 
3262  /* Process background workers. */
3264  {
3265  RegisteredBgWorker *rw;
3266 
3267  rw = slist_container(RegisteredBgWorker, rw_lnode, siter.cur);
3268  if (rw->rw_pid == 0)
3269  continue; /* not running */
3270  if (rw->rw_pid == pid)
3271  {
3272  /*
3273  * Found entry for freshly-dead worker, so remove it.
3274  */
3276  dlist_delete(&rw->rw_backend->elem);
3277 #ifdef EXEC_BACKEND
3278  ShmemBackendArrayRemove(rw->rw_backend);
3279 #endif
3280  free(rw->rw_backend);
3281  rw->rw_backend = NULL;
3282  rw->rw_pid = 0;
3283  rw->rw_child_slot = 0;
3284  /* don't reset crashed_at */
3285  /* don't report child stop, either */
3286  /* Keep looping so we can signal remaining workers */
3287  }
3288  else
3289  {
3290  /*
3291  * This worker is still alive. Unless we did so already, tell it
3292  * to commit hara-kiri.
3293  *
3294  * SIGQUIT is the special signal that says exit without proc_exit
3295  * and let the user know what's going on. But if SendStop is set
3296  * (-s on command line), then we send SIGSTOP instead, so that we
3297  * can get core dumps from all backends by hand.
3298  */
3299  if (take_action)
3300  {
3301  ereport(DEBUG2,
3302  (errmsg_internal("sending %s to process %d",
3303  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3304  (int) rw->rw_pid)));
3306  }
3307  }
3308  }
3309 
3310  /* Process regular backends */
3312  {
3313  bp = dlist_container(Backend, elem, iter.cur);
3314 
3315  if (bp->pid == pid)
3316  {
3317  /*
3318  * Found entry for freshly-dead backend, so remove it.
3319  */
3320  if (!bp->dead_end)
3321  {
3323 #ifdef EXEC_BACKEND
3324  ShmemBackendArrayRemove(bp);
3325 #endif
3326  }
3327  dlist_delete(iter.cur);
3328  free(bp);
3329  /* Keep looping so we can signal remaining backends */
3330  }
3331  else
3332  {
3333  /*
3334  * This backend is still alive. Unless we did so already, tell it
3335  * to commit hara-kiri.
3336  *
3337  * SIGQUIT is the special signal that says exit without proc_exit
3338  * and let the user know what's going on. But if SendStop is set
3339  * (-s on command line), then we send SIGSTOP instead, so that we
3340  * can get core dumps from all backends by hand.
3341  *
3342  * We could exclude dead_end children here, but at least in the
3343  * SIGSTOP case it seems better to include them.
3344  *
3345  * Background workers were already processed above; ignore them
3346  * here.
3347  */
3348  if (bp->bkend_type == BACKEND_TYPE_BGWORKER)
3349  continue;
3350 
3351  if (take_action)
3352  {
3353  ereport(DEBUG2,
3354  (errmsg_internal("sending %s to process %d",
3355  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3356  (int) bp->pid)));
3357  signal_child(bp->pid, (SendStop ? SIGSTOP : SIGQUIT));
3358  }
3359  }
3360  }
3361 
3362  /* Take care of the startup process too */
3363  if (pid == StartupPID)
3364  {
3365  StartupPID = 0;
3367  }
3368  else if (StartupPID != 0 && take_action)
3369  {
3370  ereport(DEBUG2,
3371  (errmsg_internal("sending %s to process %d",
3372  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3373  (int) StartupPID)));
3376  }
3377 
3378  /* Take care of the bgwriter too */
3379  if (pid == BgWriterPID)
3380  BgWriterPID = 0;
3381  else if (BgWriterPID != 0 && take_action)
3382  {
3383  ereport(DEBUG2,
3384  (errmsg_internal("sending %s to process %d",
3385  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3386  (int) BgWriterPID)));
3388  }
3389 
3390  /* Take care of the checkpointer too */
3391  if (pid == CheckpointerPID)
3392  CheckpointerPID = 0;
3393  else if (CheckpointerPID != 0 && take_action)
3394  {
3395  ereport(DEBUG2,
3396  (errmsg_internal("sending %s to process %d",
3397  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3398  (int) CheckpointerPID)));
3400  }
3401 
3402  /* Take care of the walwriter too */
3403  if (pid == WalWriterPID)
3404  WalWriterPID = 0;
3405  else if (WalWriterPID != 0 && take_action)
3406  {
3407  ereport(DEBUG2,
3408  (errmsg_internal("sending %s to process %d",
3409  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3410  (int) WalWriterPID)));
3412  }
3413 
3414  /* Take care of the walreceiver too */
3415  if (pid == WalReceiverPID)
3416  WalReceiverPID = 0;
3417  else if (WalReceiverPID != 0 && take_action)
3418  {
3419  ereport(DEBUG2,
3420  (errmsg_internal("sending %s to process %d",
3421  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3422  (int) WalReceiverPID)));
3424  }
3425 
3426  /* Take care of the autovacuum launcher too */
3427  if (pid == AutoVacPID)
3428  AutoVacPID = 0;
3429  else if (AutoVacPID != 0 && take_action)
3430  {
3431  ereport(DEBUG2,
3432  (errmsg_internal("sending %s to process %d",
3433  (SendStop ? "SIGSTOP" : "SIGQUIT"),
3434  (int) AutoVacPID)));
3436  }
3437 
3438  /*
3439  * Force a power-cycle of the pgarch process too. (This isn't absolutely
3440  * necessary, but it seems like a good idea for robustness, and it
3441  * simplifies the state-machine logic in the case where a shutdown request
3442  * arrives during crash processing.)
3443  */
3444  if (PgArchPID != 0 && take_action)
3445  {
3446  ereport(DEBUG2,
3447  (errmsg_internal("sending %s to process %d",
3448  "SIGQUIT",
3449  (int) PgArchPID)));
3451  }
3452 
3453  /*
3454  * Force a power-cycle of the pgstat process too. (This isn't absolutely
3455  * necessary, but it seems like a good idea for robustness, and it
3456  * simplifies the state-machine logic in the case where a shutdown request
3457  * arrives during crash processing.)
3458  */
3459  if (PgStatPID != 0 && take_action)
3460  {
3461  ereport(DEBUG2,
3462  (errmsg_internal("sending %s to process %d",
3463  "SIGQUIT",
3464  (int) PgStatPID)));
3467  }
3468 
3469  /* We do NOT restart the syslogger */
3470 
3471  if (Shutdown != ImmediateShutdown)
3472  FatalError = true;
3473 
3474  /* We now transit into a state of waiting for children to die */
3475  if (pmState == PM_RECOVERY ||
3476  pmState == PM_HOT_STANDBY ||
3477  pmState == PM_RUN ||
3478  pmState == PM_WAIT_BACKUP ||
3480  pmState == PM_SHUTDOWN)
3482 
3483  /*
3484  * .. and if this doesn't happen quickly enough, now the clock is ticking
3485  * for us to kill them without mercy.
3486  */
3487  if (AbortStartTime == 0)
3488  AbortStartTime = time(NULL);
3489 }
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:3818
#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:65
static pid_t WalWriterPID
Definition: postmaster.c:250
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define NULL
Definition: c.h:229
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:3495
static int SendStop
Definition: postmaster.c:230
static time_t AbortStartTime
Definition: postmaster.c:342
void allow_immediate_pgstat_restart(void)
Definition: pgstat.c:758
static pid_t PgArchPID
Definition: postmaster.c:253
static int initMasks ( fd_set *  rmask)
static

Definition at line 1881 of file postmaster.c.

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

Referenced by ServerLoop().

1882 {
1883  int maxsock = -1;
1884  int i;
1885 
1886  FD_ZERO(rmask);
1887 
1888  for (i = 0; i < MAXLISTEN; i++)
1889  {
1890  int fd = ListenSocket[i];
1891 
1892  if (fd == PGINVALID_SOCKET)
1893  break;
1894  FD_SET(fd, rmask);
1895 
1896  if (fd > maxsock)
1897  maxsock = fd;
1898  }
1899 
1900  return maxsock + 1;
1901 }
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 6252 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().

6253 {
6254 #ifndef WIN32
6255 
6256  /*
6257  * Create a pipe. Postmaster holds the write end of the pipe open
6258  * (POSTMASTER_FD_OWN), and children hold the read end. Children can pass
6259  * the read file descriptor to select() to wake up in case postmaster
6260  * dies, or check for postmaster death with a (read() == 0). Children must
6261  * close the write end as soon as possible after forking, because EOF
6262  * won't be signaled in the read end until all processes have closed the
6263  * write fd. That is taken care of in ClosePostmasterPorts().
6264  */
6266  if (pipe(postmaster_alive_fds))
6267  ereport(FATAL,
6269  errmsg_internal("could not create pipe to monitor postmaster death: %m")));
6270 
6271  /*
6272  * Set O_NONBLOCK to allow testing for the fd's presence with a read()
6273  * call.
6274  */
6275  if (fcntl(postmaster_alive_fds[POSTMASTER_FD_WATCH], F_SETFL, O_NONBLOCK))
6276  ereport(FATAL,
6278  errmsg_internal("could not set postmaster death monitoring pipe to nonblocking mode: %m")));
6279 #else
6280 
6281  /*
6282  * On Windows, we use a process handle for the same purpose.
6283  */
6284  if (DuplicateHandle(GetCurrentProcess(),
6285  GetCurrentProcess(),
6286  GetCurrentProcess(),
6287  &PostmasterHandle,
6288  0,
6289  TRUE,
6290  DUPLICATE_SAME_ACCESS) == 0)
6291  ereport(FATAL,
6292  (errmsg_internal("could not duplicate postmaster handle: error code %lu",
6293  GetLastError())));
6294 #endif /* WIN32 */
6295 }
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:675
#define TRUE
Definition: c.h:217
#define POSTMASTER_FD_WATCH
Definition: postmaster.h:42
static void LogChildExit ( int  lev,
const char *  procname,
int  pid,
int  exitstatus 
)
static

Definition at line 3495 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().

3496 {
3497  /*
3498  * size of activity_buffer is arbitrary, but set equal to default
3499  * track_activity_query_size
3500  */
3501  char activity_buffer[1024];
3502  const char *activity = NULL;
3503 
3504  if (!EXIT_STATUS_0(exitstatus))
3505  activity = pgstat_get_crashed_backend_activity(pid,
3506  activity_buffer,
3507  sizeof(activity_buffer));
3508 
3509  if (WIFEXITED(exitstatus))
3510  ereport(lev,
3511 
3512  /*------
3513  translator: %s is a noun phrase describing a child process, such as
3514  "server process" */
3515  (errmsg("%s (PID %d) exited with exit code %d",
3516  procname, pid, WEXITSTATUS(exitstatus)),
3517  activity ? errdetail("Failed process was running: %s", activity) : 0));
3518  else if (WIFSIGNALED(exitstatus))
3519 #if defined(WIN32)
3520  ereport(lev,
3521 
3522  /*------
3523  translator: %s is a noun phrase describing a child process, such as
3524  "server process" */
3525  (errmsg("%s (PID %d) was terminated by exception 0x%X",
3526  procname, pid, WTERMSIG(exitstatus)),
3527  errhint("See C include file \"ntstatus.h\" for a description of the hexadecimal value."),
3528  activity ? errdetail("Failed process was running: %s", activity) : 0));
3529 #elif defined(HAVE_DECL_SYS_SIGLIST) && HAVE_DECL_SYS_SIGLIST
3530  ereport(lev,
3531 
3532  /*------
3533  translator: %s is a noun phrase describing a child process, such as
3534  "server process" */
3535  (errmsg("%s (PID %d) was terminated by signal %d: %s",
3536  procname, pid, WTERMSIG(exitstatus),
3537  WTERMSIG(exitstatus) < NSIG ?
3538  sys_siglist[WTERMSIG(exitstatus)] : "(unknown)"),
3539  activity ? errdetail("Failed process was running: %s", activity) : 0));
3540 #else
3541  ereport(lev,
3542 
3543  /*------
3544  translator: %s is a noun phrase describing a child process, such as
3545  "server process" */
3546  (errmsg("%s (PID %d) was terminated by signal %d",
3547  procname, pid, WTERMSIG(exitstatus)),
3548  activity ? errdetail("Failed process was running: %s", activity) : 0));
3549 #endif
3550  else
3551  ereport(lev,
3552 
3553  /*------
3554  translator: %s is a noun phrase describing a child process, such as
3555  "server process" */
3556  (errmsg("%s (PID %d) exited with unrecognized status %d",
3557  procname, pid, exitstatus),
3558  activity ? errdetail("Failed process was running: %s", activity) : 0));
3559 }
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:229
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:3926
#define WTERMSIG(w)
Definition: win32.h:183
#define EXIT_STATUS_0(st)
Definition: postmaster.c:547
int MaxLivePostmasterChildren ( void  )

Definition at line 5442 of file postmaster.c.

References autovacuum_max_workers, max_worker_processes, and MaxConnections.

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

5443 {
5444  return 2 * (MaxConnections + autovacuum_max_workers + 1 +
5446 }
int MaxConnections
Definition: globals.c:123
int autovacuum_max_workers
Definition: autovacuum.c:111
int max_worker_processes
Definition: globals.c:124
static void maybe_start_bgworker ( void  )
static

Definition at line 5692 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().

5693 {
5694  slist_mutable_iter iter;
5695  TimestampTz now = 0;
5696 
5697  if (FatalError)
5698  {
5699  StartWorkerNeeded = false;
5700  HaveCrashedWorker = false;
5701  return; /* not yet */
5702  }
5703 
5704  HaveCrashedWorker = false;
5705 
5707  {
5708  RegisteredBgWorker *rw;
5709 
5710  rw = slist_container(RegisteredBgWorker, rw_lnode, iter.cur);
5711 
5712  /* already running? */
5713  if (rw->rw_pid != 0)
5714  continue;
5715 
5716  /* marked for death? */
5717  if (rw->rw_terminate)
5718  {
5719  ForgetBackgroundWorker(&iter);
5720  continue;
5721  }
5722 
5723  /*
5724  * If this worker has crashed previously, maybe it needs to be
5725  * restarted (unless on registration it specified it doesn't want to
5726  * be restarted at all). Check how long ago did a crash last happen.
5727  * If the last crash is too recent, don't start it right away; let it
5728  * be restarted once enough time has passed.
5729  */
5730  if (rw->rw_crashed_at != 0)
5731  {
5733  {
5734  ForgetBackgroundWorker(&iter);
5735  continue;
5736  }
5737 
5738  if (now == 0)
5739  now = GetCurrentTimestamp();
5740 
5742  rw->rw_worker.bgw_restart_time * 1000))
5743  {
5744  HaveCrashedWorker = true;
5745  continue;
5746  }
5747  }
5748 
5750  {
5751  /* reset crash time before calling assign_backendlist_entry */
5752  rw->rw_crashed_at = 0;
5753 
5754  /*
5755  * Allocate and assign the Backend element. Note we must do this
5756  * before forking, so that we can handle out of memory properly.
5757  */
5758  if (!assign_backendlist_entry(rw))
5759  return;
5760 
5761  do_start_bgworker(rw); /* sets rw->rw_pid */
5762 
5764 #ifdef EXEC_BACKEND
5765  ShmemBackendArrayAdd(rw->rw_backend);
5766 #endif
5767 
5768  /*
5769  * Have ServerLoop call us again. Note that there might not
5770  * actually *be* another runnable worker, but we don't care all
5771  * that much; we will find out the next time we run.
5772  */
5773  StartWorkerNeeded = true;
5774  return;
5775  }
5776  }
5777 
5778  /* no runnable worker found */
5779  StartWorkerNeeded = false;
5780 }
static volatile bool StartWorkerNeeded
Definition: postmaster.c:360
struct bkend * rw_backend
static bool bgworker_should_start_now(BgWorkerStartTime start_time)
Definition: postmaster.c:5593
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1569
int64 TimestampTz
Definition: timestamp.h:39
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:1648
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:5537
static bool assign_backendlist_entry(RegisteredBgWorker *rw)
Definition: postmaster.c:5635
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:1533
static void pmdie ( SIGNAL_ARGS  )
static

Definition at line 2566 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().

2567 {
2568  int save_errno = errno;
2569 
2570  PG_SETMASK(&BlockSig);
2571 
2572  ereport(DEBUG2,
2573  (errmsg_internal("postmaster received signal %d",
2574  postgres_signal_arg)));
2575 
2576  switch (postgres_signal_arg)
2577  {
2578  case SIGTERM:
2579 
2580  /*
2581  * Smart Shutdown:
2582  *
2583  * Wait for children to end their work, then shut down.
2584  */
2585  if (Shutdown >= SmartShutdown)
2586  break;
2588  ereport(LOG,
2589  (errmsg("received smart shutdown request")));
2590 #ifdef USE_SYSTEMD
2591  sd_notify(0, "STOPPING=1");
2592 #endif
2593 
2594  if (pmState == PM_RUN || pmState == PM_RECOVERY ||
2596  {
2597  /* autovac workers are told to shut down immediately */
2598  /* and bgworkers too; does this need tweaking? */
2599  SignalSomeChildren(SIGTERM,
2601  /* and the autovac launcher too */
2602  if (AutoVacPID != 0)
2603  signal_child(AutoVacPID, SIGTERM);
2604  /* and the bgwriter too */
2605  if (BgWriterPID != 0)
2606  signal_child(BgWriterPID, SIGTERM);
2607  /* and the walwriter too */
2608  if (WalWriterPID != 0)
2609  signal_child(WalWriterPID, SIGTERM);
2610 
2611  /*
2612  * If we're in recovery, we can't kill the startup process
2613  * right away, because at present doing so does not release
2614  * its locks. We might want to change this in a future
2615  * release. For the time being, the PM_WAIT_READONLY state
2616  * indicates that we're waiting for the regular (read only)
2617  * backends to die off; once they do, we'll kill the startup
2618  * and walreceiver processes.
2619  */
2620  pmState = (pmState == PM_RUN) ?
2622  }
2623 
2624  /*
2625  * Now wait for online backup mode to end and backends to exit. If
2626  * that is already the case, PostmasterStateMachine will take the
2627  * next step.
2628  */
2630  break;
2631 
2632  case SIGINT:
2633 
2634  /*
2635  * Fast Shutdown:
2636  *
2637  * Abort all children with SIGTERM (rollback active transactions
2638  * and exit) and shut down when they are gone.
2639  */
2640  if (Shutdown >= FastShutdown)
2641  break;
2643  ereport(LOG,
2644  (errmsg("received fast shutdown request")));
2645 #ifdef USE_SYSTEMD
2646  sd_notify(0, "STOPPING=1");
2647 #endif
2648 
2649  if (StartupPID != 0)
2650  signal_child(StartupPID, SIGTERM);
2651  if (BgWriterPID != 0)
2652  signal_child(BgWriterPID, SIGTERM);
2653  if (WalReceiverPID != 0)
2654  signal_child(WalReceiverPID, SIGTERM);
2655  if (pmState == PM_RECOVERY)
2656  {
2658 
2659  /*
2660  * Only startup, bgwriter, walreceiver, possibly bgworkers,
2661  * and/or checkpointer should be active in this state; we just
2662  * signaled the first four, and we don't want to kill
2663  * checkpointer yet.
2664  */
2666  }
2667  else if (pmState == PM_RUN ||
2668  pmState == PM_WAIT_BACKUP ||
2672  {
2673  ereport(LOG,
2674  (errmsg("aborting any active transactions")));
2675  /* shut down all backends and workers */
2676  SignalSomeChildren(SIGTERM,
2679  /* and the autovac launcher too */
2680  if (AutoVacPID != 0)
2681  signal_child(AutoVacPID, SIGTERM);
2682  /* and the walwriter too */
2683  if (WalWriterPID != 0)
2684  signal_child(WalWriterPID, SIGTERM);
2686  }
2687 
2688  /*
2689  * Now wait for backends to exit. If there are none,
2690  * PostmasterStateMachine will take the next step.
2691  */
2693  break;
2694 
2695  case SIGQUIT:
2696 
2697  /*
2698  * Immediate Shutdown:
2699  *
2700  * abort all children with SIGQUIT, wait for them to exit,
2701  * terminate remaining ones with SIGKILL, then exit without
2702  * attempt to properly shut down the data base system.
2703  */
2704  if (Shutdown >= ImmediateShutdown)
2705  break;
2707  ereport(LOG,
2708  (errmsg("received immediate shutdown request")));
2709 #ifdef USE_SYSTEMD
2710  sd_notify(0, "STOPPING=1");
2711 #endif
2712 
2715 
2716  /* set stopwatch for them to die */
2717  AbortStartTime = time(NULL);
2718 
2719  /*
2720  * Now wait for backends to exit. If there are none,
2721  * PostmasterStateMachine will take the next step.
2722  */
2724  break;
2725  }
2726 
2728 
2729  errno = save_errno;
2730 }
static void PostmasterStateMachine(void)
Definition: postmaster.c:3568
static pid_t WalReceiverPID
Definition: postmaster.c:251
static bool SignalSomeChildren(int signal, int targets)
Definition: postmaster.c:3844
#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:3888
#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:3818
#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:229
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(), errcode_for_file_access(), 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, LOG_METAINFO_DATAFILE, 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(), 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  /* Remove any outdated file holding the current log filenames. */
1236  if (unlink(LOG_METAINFO_DATAFILE) < 0 && errno != ENOENT)
1237  ereport(LOG,
1239  errmsg("could not remove file \"%s\": %m",
1241 
1242  /*
1243  * If enabled, start up syslogger collection subprocess
1244  */
1246 
1247  /*
1248  * Reset whereToSendOutput from DestDebug (its starting state) to
1249  * DestNone. This stops ereport from sending log messages to stderr unless
1250  * Log_destination permits. We don't do this until the postmaster is
1251  * fully launched, since startup failures may as well be reported to
1252  * stderr.
1253  *
1254  * If we are in fact disabling logging to stderr, first emit a log message
1255  * saying so, to provide a breadcrumb trail for users who may not remember
1256  * that their logging is configured to go somewhere else.
1257  */
1259  ereport(LOG,
1260  (errmsg("ending log output to stderr"),
1261  errhint("Future log output will go to log destination \"%s\".",
1263 
1265 
1266  /*
1267  * Initialize stats collection subsystem (this does NOT start the
1268  * collector process!)
1269  */
1270  pgstat_init();
1271 
1272  /*
1273  * Initialize the autovacuum subsystem (again, no process start yet)
1274  */
1275  autovac_init();
1276 
1277  /*
1278  * Load configuration files for client authentication.
1279  */
1280  if (!load_hba())
1281  {
1282  /*
1283  * It makes no sense to continue if we fail to load the HBA file,
1284  * since there is no way to connect to the database in this case.
1285  */
1286  ereport(FATAL,
1287  (errmsg("could not load pg_hba.conf")));
1288  }
1289  if (!load_ident())
1290  {
1291  /*
1292  * We can start up without the IDENT file, although it means that you
1293  * cannot log in using any of the authentication methods that need a
1294  * user name mapping. load_ident() already logged the details of error
1295  * to the log.
1296  */
1297  }
1298 
1299 #ifdef HAVE_PTHREAD_IS_THREADED_NP
1300 
1301  /*
1302  * On macOS, libintl replaces setlocale() with a version that calls
1303  * CFLocaleCopyCurrent() when its second argument is "" and every relevant
1304  * environment variable is unset or empty. CFLocaleCopyCurrent() makes
1305  * the process multithreaded. The postmaster calls sigprocmask() and
1306  * calls fork() without an immediate exec(), both of which have undefined
1307  * behavior in a multithreaded program. A multithreaded postmaster is the
1308  * normal case on Windows, which offers neither fork() nor sigprocmask().
1309  */
1310  if (pthread_is_threaded_np() != 0)
1311  ereport(FATAL,
1312  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1313  errmsg("postmaster became multithreaded during startup"),
1314  errhint("Set the LC_ALL environment variable to a valid locale.")));
1315 #endif
1316 
1317  /*
1318  * Remember postmaster startup time
1319  */
1321 #ifndef HAVE_STRONG_RANDOM
1322  /* RandomCancelKey wants its own copy */
1324 #endif
1325 
1326  /*
1327  * We're ready to rock and roll...
1328  */
1330  Assert(StartupPID != 0);
1332  pmState = PM_STARTUP;
1333 
1334  /* Some workers may be scheduled to start now */
1336 
1337  status = ServerLoop();
1338 
1339  /*
1340  * ServerLoop probably shouldn't ever return, but if it does, close down.
1341  */
1342  ExitPostmaster(status != STATUS_OK);
1343 
1344  abort(); /* not reached */
1345 }
pg_stack_base_t set_stack_base(void)
Definition: postgres.c:3045
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int secure_initialize(bool isServerStart)
Definition: be-secure.c:73
#define NIL
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bool IsPostmasterEnvironment
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bool EnableSSL
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#define SIGUSR1
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static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
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Definition: datetime.c:4464
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Definition: elog.c:575
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Definition: syslogger.h:94
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Definition: postgres.c:3264
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
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Definition: syslogger.c:520
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Definition: postgres.c:3193
#define LOG
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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
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Definition: hba.c:2873
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Definition: autovacuum.c:2968
static struct @114 value
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Definition: pqsignal.c:41
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Definition: postmaster.c:1352
static void InitPostmasterDeathWatchHandle(void)
Definition: postmaster.c:6252
bool SplitDirectoriesString(char *rawstring, char separator, List **namelist)
Definition: varlena.c:3365
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Definition: mcxt.c:950
#define SIG_IGN
Definition: win32.h:193
int optind
Definition: getopt.c:51
#define ERROR
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static pid_t StartupPID
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int PostPortNumber
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Definition: postmaster.c:211
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#define FATAL
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char * external_pid_file
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#define S_IRGRP
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static bool success
Definition: pg_basebackup.c:96
Definition: dest.h:88
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
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Definition: hba.c:2091
char * bonjour_name
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Definition: xlog.c:94
int errcode_for_file_access(void)
Definition: elog.c:598
static pid_t SysLoggerPID
Definition: postmaster.c:255
#define S_IROTH
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static void getInstallationPaths(const char *argv0)
Definition: postmaster.c:1400
char * Log_destination_string
Definition: elog.c:107
char * ListenAddresses
Definition: postmaster.c:200
int StreamServerPort(int family, char *hostName, unsigned short portNumber, char *unixSocketDir, pgsocket ListenSocket[], int MaxListen)
Definition: pqcomm.c:311
int unlink(const char *filename)
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:975
MemoryContext TopMemoryContext
Definition: mcxt.c:43
static void pmdie(SIGNAL_ARGS)
Definition: postmaster.c:2566
static void SIGHUP_handler(SIGNAL_ARGS)
Definition: postmaster.c:2493
bool enable_bonjour
Definition: postmaster.c:242
void RemovePromoteSignalFiles(void)
Definition: xlog.c:12044
int max_wal_senders
Definition: walsender.c:114
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:322
static PMState pmState
Definition: postmaster.c:338
bool SelectConfigFiles(const char *userDoption, const char *progname)
Definition: guc.c:4668
void ApplyLauncherRegister(void)
Definition: launcher.c:546
#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:2475
static bool Reinit
Definition: postmaster.c:229
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
#define free(a)
Definition: header.h:65
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define NULL
Definition: c.h:229
static char ExtraOptions[MAXPGPATH]
Definition: postmaster.c:220
static int ServerLoop(void)
Definition: postmaster.c:1645
#define Assert(condition)
Definition: c.h:675
#define lfirst(lc)
Definition: pg_list.h:106
void RemovePgTempFiles(void)
Definition: fd.c:2706
static void reaper(SIGNAL_ARGS)
Definition: postmaster.c:2736
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:881
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:4943
void pgstat_init(void)
Definition: pgstat.c:352
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:5692
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:224
#define SIGCHLD
Definition: win32.h:206
static int SendStop
Definition: postmaster.c:230
void process_shared_preload_libraries(void)
Definition: miscinit.c:1481
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:4446
bool PostmasterMarkPIDForWorkerNotify ( int  pid)

Definition at line 5788 of file postmaster.c.

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

Referenced by BackgroundWorkerStateChange().

5789 {
5790  dlist_iter iter;
5791  Backend *bp;
5792 
5793  dlist_foreach(iter, &BackendList)
5794  {
5795  bp = dlist_container(Backend, elem, iter.cur);
5796  if (bp->pid == pid)
5797  {
5798  bp->bgworker_notify = true;
5799  return true;
5800  }
5801  }
5802  return false;
5803 }
#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 3568 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().

3569 {
3570  if (pmState == PM_WAIT_BACKUP)
3571  {
3572  /*
3573  * PM_WAIT_BACKUP state ends when online backup mode is not active.
3574  */
3575  if (!BackupInProgress())
3577  }
3578 
3579  if (pmState == PM_WAIT_READONLY)
3580  {
3581  /*
3582  * PM_WAIT_READONLY state ends when we have no regular backends that
3583  * have been started during recovery. We kill the startup and
3584  * walreceiver processes and transition to PM_WAIT_BACKENDS. Ideally,
3585  * we might like to kill these processes first and then wait for
3586  * backends to die off, but that doesn't work at present because
3587  * killing the startup process doesn't release its locks.
3588  */
3590  {
3591  if (StartupPID != 0)
3592  signal_child(StartupPID, SIGTERM);
3593  if (WalReceiverPID != 0)
3594  signal_child(WalReceiverPID, SIGTERM);
3596  }
3597  }
3598 
3599  /*
3600  * If we are in a state-machine state that implies waiting for backends to
3601  * exit, see if they're all gone, and change state if so.
3602  */
3603  if (pmState == PM_WAIT_BACKENDS)
3604  {
3605  /*
3606  * PM_WAIT_BACKENDS state ends when we have no regular backends
3607  * (including autovac workers), no bgworkers (including unconnected
3608  * ones), and no walwriter, autovac launcher or bgwriter. If we are
3609  * doing crash recovery or an immediate shutdown then we expect the
3610  * checkpointer to exit as well, otherwise not. The archiver, stats,
3611  * and syslogger processes are disregarded since they are not
3612  * connected to shared memory; we also disregard dead_end children
3613  * here. Walsenders are also disregarded, they will be terminated
3614  * later after writing the checkpoint record, like the archiver
3615  * process.
3616  */
3618  StartupPID == 0 &&
3619  WalReceiverPID == 0 &&
3620  BgWriterPID == 0 &&
3621  (CheckpointerPID == 0 ||
3623  WalWriterPID == 0 &&
3624  AutoVacPID == 0)
3625  {
3627  {
3628  /*
3629  * Start waiting for dead_end children to die. This state
3630  * change causes ServerLoop to stop creating new ones.
3631  */
3633 
3634  /*
3635  * We already SIGQUIT'd the archiver and stats processes, if
3636  * any, when we started immediate shutdown or entered
3637  * FatalError state.
3638  */
3639  }
3640  else
3641  {
3642  /*
3643  * If we get here, we are proceeding with normal shutdown. All
3644  * the regular children are gone, and it's time to tell the
3645  * checkpointer to do a shutdown checkpoint.
3646  */
3648  /* Start the checkpointer if not running */
3649  if (CheckpointerPID == 0)
3651  /* And tell it to shut down */
3652  if (CheckpointerPID != 0)
3653  {
3655  pmState = PM_SHUTDOWN;
3656  }
3657  else
3658  {
3659  /*
3660  * If we failed to fork a checkpointer, just shut down.
3661  * Any required cleanup will happen at next restart. We
3662  * set FatalError so that an "abnormal shutdown" message
3663  * gets logged when we exit.
3664  */
3665  FatalError = true;
3667 
3668  /* Kill the walsenders, archiver and stats collector too */
3670  if (PgArchPID != 0)
3672  if (PgStatPID != 0)
3674  }
3675  }
3676  }
3677  }
3678 
3679  if (pmState == PM_SHUTDOWN_2)
3680  {
3681  /*
3682  * PM_SHUTDOWN_2 state ends when there's no other children than
3683  * dead_end children left. There shouldn't be any regular backends
3684  * left by now anyway; what we're really waiting for is walsenders and
3685  * archiver.
3686  *
3687  * Walreceiver should normally be dead by now, but not when a fast
3688  * shutdown is performed during recovery.
3689  */
3690  if (PgArchPID == 0 && CountChildren(BACKEND_TYPE_ALL) == 0 &&
3691  WalReceiverPID == 0)
3692  {
3694  }
3695  }
3696 
3697  if (pmState == PM_WAIT_DEAD_END)
3698  {
3699  /*
3700  * PM_WAIT_DEAD_END state ends when the BackendList is entirely empty
3701  * (ie, no dead_end children remain), and the archiver and stats
3702  * collector are gone too.
3703  *
3704  * The reason we wait for those two is to protect them against a new
3705  * postmaster starting conflicting subprocesses; this isn't an
3706  * ironclad protection, but it at least helps in the
3707  * shutdown-and-immediately-restart scenario. Note that they have
3708  * already been sent appropriate shutdown signals, either during a
3709  * normal state transition leading up to PM_WAIT_DEAD_END, or during
3710  * FatalError processing.
3711  */
3712  if (dlist_is_empty(&BackendList) &&
3713  PgArchPID == 0 && PgStatPID == 0)
3714  {
3715  /* These other guys should be dead already */
3716  Assert(StartupPID == 0);
3717  Assert(WalReceiverPID == 0);
3718  Assert(BgWriterPID == 0);
3719  Assert(CheckpointerPID == 0);
3720  Assert(WalWriterPID == 0);
3721  Assert(AutoVacPID == 0);
3722  /* syslogger is not considered here */
3724  }
3725  }
3726 
3727  /*
3728  * If we've been told to shut down, we exit as soon as there are no
3729  * remaining children. If there was a crash, cleanup will occur at the
3730  * next startup. (Before PostgreSQL 8.3, we tried to recover from the
3731  * crash before exiting, but that seems unwise if we are quitting because
3732  * we got SIGTERM from init --- there may well not be time for recovery
3733  * before init decides to SIGKILL us.)
3734  *
3735  * Note that the syslogger continues to run. It will exit when it sees
3736  * EOF on its input pipe, which happens when there are no more upstream
3737  * processes.
3738  */
3740  {
3741  if (FatalError)
3742  {
3743  ereport(LOG, (errmsg("abnormal database system shutdown")));
3744  ExitPostmaster(1);
3745  }
3746  else
3747  {
3748  /*
3749  * Terminate exclusive backup mode to avoid recovery after a clean
3750  * fast shutdown. Since an exclusive backup can only be taken
3751  * during normal running (and not, for example, while running
3752  * under Hot Standby) it only makes sense to do this if we reached
3753  * normal running. If we're still in recovery, the backup file is
3754  * one we're recovering *from*, and we must keep it around so that
3755  * recovery restarts from the right place.
3756  */
3758  CancelBackup();
3759 
3760  /* Normal exit from the postmaster is here */
3761  ExitPostmaster(0);
3762  }
3763  }
3764 
3765  /*
3766  * If the startup process failed, or the user does not want an automatic
3767  * restart after backend crashes, wait for all non-syslogger children to
3768  * exit, and then exit postmaster. We don't try to reinitialize when the
3769  * startup process fails, because more than likely it will just fail again
3770  * and we will keep trying forever.
3771  */
3772  if (pmState == PM_NO_CHILDREN &&
3774  ExitPostmaster(1);
3775 
3776  /*
3777  * If we need to recover from a crash, wait for all non-syslogger children
3778  * to exit, then reset shmem and StartupDataBase.
3779  */
3780  if (FatalError && pmState == PM_NO_CHILDREN)
3781  {
3782  ereport(LOG,
3783  (errmsg("all server processes terminated; reinitializing")));
3784 
3785  /* allow background workers to immediately restart */
3787 
3788  shmem_exit(1);
3790 
3792  Assert(StartupPID != 0);
3794  pmState = PM_STARTUP;
3795  /* crash recovery started, reset SIGKILL flag */
3796  AbortStartTime = 0;
3797  }
3798 }
void CancelBackup(void)
Definition: xlog.c:11339
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:11319
void ResetBackgroundWorkerCrashTimes(void)
Definition: bgworker.c:495
#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:5170
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:4910
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:3818
#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:2475
static pid_t WalWriterPID
Definition: postmaster.c:250
#define Assert(condition)
Definition: c.h:675
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 2240 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().

2241 {
2242  CancelRequestPacket *canc = (CancelRequestPacket *) pkt;
2243  int backendPID;
2244  int32 cancelAuthCode;
2245  Backend *bp;
2246 
2247 #ifndef EXEC_BACKEND
2248  dlist_iter iter;
2249 #else
2250  int i;
2251 #endif
2252 
2253  backendPID = (int) ntohl(canc->backendPID);
2254  cancelAuthCode = (int32) ntohl(canc->cancelAuthCode);
2255 
2256  /*
2257  * See if we have a matching backend. In the EXEC_BACKEND case, we can no
2258  * longer access the postmaster's own backend list, and must rely on the
2259  * duplicate array in shared memory.
2260  */
2261 #ifndef EXEC_BACKEND
2262  dlist_foreach(iter, &BackendList)
2263  {
2264  bp = dlist_container(Backend, elem, iter.cur);
2265 #else
2266  for (i = MaxLivePostmasterChildren() - 1; i >= 0; i--)
2267  {
2268  bp = (Backend *) &ShmemBackendArray[i];
2269 #endif
2270  if (bp->pid == backendPID)
2271  {
2272  if (bp->cancel_key == cancelAuthCode)
2273  {
2274  /* Found a match; signal that backend to cancel current op */
2275  ereport(DEBUG2,
2276  (errmsg_internal("processing cancel request: sending SIGINT to process %d",
2277  backendPID)));
2278  signal_child(bp->pid, SIGINT);
2279  }
2280  else
2281  /* Right PID, wrong key: no way, Jose */
2282  ereport(LOG,
2283  (errmsg("wrong key in cancel request for process %d",
2284  backendPID)));
2285  return;
2286  }
2287  }
2288 
2289  /* No matching backend */
2290  ereport(LOG,
2291  (errmsg("PID %d in cancel request did not match any process",
2292  backendPID)));
2293 }
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
uint32 cancelAuthCode
Definition: pqcomm.h:196
#define LOG
Definition: elog.h:26
signed int int32
Definition: c.h:256
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
uint32 backendPID
Definition: pqcomm.h:195
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:3818
#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:5442
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 1916 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().

1917 {
1918  int32 len;
1919  void *buf;
1920  ProtocolVersion proto;
1921  MemoryContext oldcontext;
1922 
1923  pq_startmsgread();
1924  if (pq_getbytes((char *) &len, 4) == EOF)
1925  {
1926  /*
1927  * EOF after SSLdone probably means the client didn't like our
1928  * response to NEGOTIATE_SSL_CODE. That's not an error condition, so
1929  * don't clutter the log with a complaint.
1930  */
1931  if (!SSLdone)
1933  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1934  errmsg("incomplete startup packet")));
1935  return STATUS_ERROR;
1936  }
1937 
1938  len = ntohl(len);
1939  len -= 4;
1940 
1941  if (len < (int32) sizeof(ProtocolVersion) ||
1943  {
1945  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1946  errmsg("invalid length of startup packet")));
1947  return STATUS_ERROR;
1948  }
1949 
1950  /*
1951  * Allocate at least the size of an old-style startup packet, plus one
1952  * extra byte, and make sure all are zeroes. This ensures we will have
1953  * null termination of all strings, in both fixed- and variable-length
1954  * packet layouts.
1955  */
1956  if (len <= (int32) sizeof(StartupPacket))
1957  buf = palloc0(sizeof(StartupPacket) + 1);
1958  else
1959  buf = palloc0(len + 1);
1960 
1961  if (pq_getbytes(buf, len) == EOF)
1962  {
1964  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1965  errmsg("incomplete startup packet")));
1966  return STATUS_ERROR;
1967  }
1968  pq_endmsgread();
1969 
1970  /*
1971  * The first field is either a protocol version number or a special
1972  * request code.
1973  */
1974  port->proto = proto = ntohl(*((ProtocolVersion *) buf));
1975 
1976  if (proto == CANCEL_REQUEST_CODE)
1977  {
1978  processCancelRequest(port, buf);
1979  /* Not really an error, but we don't want to proceed further */
1980  return STATUS_ERROR;
1981  }
1982 
1983  if (proto == NEGOTIATE_SSL_CODE && !SSLdone)
1984  {
1985  char SSLok;
1986 
1987 #ifdef USE_SSL
1988  /* No SSL when disabled or on Unix sockets */
1989  if (!LoadedSSL || IS_AF_UNIX(port->laddr.addr.ss_family))
1990  SSLok = 'N';
1991  else
1992  SSLok = 'S'; /* Support for SSL */
1993 #else
1994  SSLok = 'N'; /* No support for SSL */
1995 #endif
1996 
1997 retry1:
1998  if (send(port->sock, &SSLok, 1, 0) != 1)
1999  {
2000  if (errno == EINTR)
2001  goto retry1; /* if interrupted, just retry */
2004  errmsg("failed to send SSL negotiation response: %m")));
2005  return STATUS_ERROR; /* close the connection */
2006  }
2007 
2008 #ifdef USE_SSL
2009  if (SSLok == 'S' && secure_open_server(port) == -1)
2010  return STATUS_ERROR;
2011 #endif
2012  /* regular startup packet, cancel, etc packet should follow... */
2013  /* but not another SSL negotiation request */
2014  return ProcessStartupPacket(port, true);
2015  }
2016 
2017  /* Could add additional special packet types here */
2018 
2019  /*
2020  * Set FrontendProtocol now so that ereport() knows what format to send if
2021  * we fail during startup.
2022  */
2023  FrontendProtocol = proto;
2024 
2025  /* Check we can handle the protocol the frontend is using. */
2026 
2031  ereport(FATAL,
2032  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2033  errmsg("unsupported frontend protocol %u.%u: server supports %u.0 to %u.%u",
2034  PG_PROTOCOL_MAJOR(proto), PG_PROTOCOL_MINOR(proto),
2038 
2039  /*
2040  * Now fetch parameters out of startup packet and save them into the Port
2041  * structure. All data structures attached to the Port struct must be
2042  * allocated in TopMemoryContext so that they will remain available in a
2043  * running backend (even after PostmasterContext is destroyed). We need
2044  * not worry about leaking this storage on failure, since we aren't in the
2045  * postmaster process anymore.
2046  */
2048 
2049  if (PG_PROTOCOL_MAJOR(proto) >= 3)
2050  {
2051  int32 offset = sizeof(ProtocolVersion);
2052 
2053  /*
2054  * Scan packet body for name/option pairs. We can assume any string
2055  * beginning within the packet body is null-terminated, thanks to
2056  * zeroing extra byte above.
2057  */
2058  port->guc_options = NIL;
2059 
2060  while (offset < len)
2061  {
2062  char *nameptr = ((char *) buf) + offset;
2063  int32 valoffset;
2064  char *valptr;
2065 
2066  if (*nameptr == '\0')
2067  break; /* found packet terminator */
2068  valoffset = offset + strlen(nameptr) + 1;
2069  if (valoffset >= len)
2070  break; /* missing value, will complain below */
2071  valptr = ((char *) buf) + valoffset;
2072 
2073  if (strcmp(nameptr, "database") == 0)
2074  port->database_name = pstrdup(valptr);
2075  else if (strcmp(nameptr, "user") == 0)
2076  port->user_name = pstrdup(valptr);
2077  else if (strcmp(nameptr, "options") == 0)
2078  port->cmdline_options = pstrdup(valptr);
2079  else if (strcmp(nameptr, "replication") == 0)
2080  {
2081  /*
2082  * Due to backward compatibility concerns the replication
2083  * parameter is a hybrid beast which allows the value to be
2084  * either boolean or the string 'database'. The latter
2085  * connects to a specific database which is e.g. required for
2086  * logical decoding while.
2087  */
2088  if (strcmp(valptr, "database") == 0)
2089  {
2090  am_walsender = true;
2091  am_db_walsender = true;
2092  }
2093  else if (!parse_bool(valptr, &am_walsender))
2094  ereport(FATAL,
2095  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2096  errmsg("invalid value for parameter \"%s\": \"%s\"",
2097  "replication",
2098  valptr),
2099  errhint("Valid values are: \"false\", 0, \"true\", 1, \"database\".")));
2100  }
2101  else
2102  {
2103  /* Assume it's a generic GUC option */
2104  port->guc_options = lappend(port->guc_options,
2105  pstrdup(nameptr));
2106  port->guc_options = lappend(port->guc_options,
2107  pstrdup(valptr));
2108  }
2109  offset = valoffset + strlen(valptr) + 1;
2110  }
2111 
2112  /*
2113  * If we didn't find a packet terminator exactly at the end of the
2114  * given packet length, complain.
2115  */
2116  if (offset != len - 1)
2117  ereport(FATAL,
2118  (errcode(ERRCODE_PROTOCOL_VIOLATION),
2119  errmsg("invalid startup packet layout: expected terminator as last byte")));
2120  }
2121  else