#include "postgres.h"
#include <sys/param.h>
#include <signal.h>
#include <time.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <grp.h>
#include <pwd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <utime.h>
#include "access/htup_details.h"
#include "catalog/pg_authid.h"
#include "common/file_perm.h"
#include "libpq/libpq.h"
#include "libpq/pqsignal.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/interrupt.h"
#include "postmaster/postmaster.h"
#include "replication/slotsync.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/pidfile.h"
#include "utils/syscache.h"
#include "utils/varlena.h"

Include dependency graph for miscinit.c:

Data Structures
struct	SerializedClientConnectionInfo

Macros
#define	DIRECTORY_LOCK_FILE "postmaster.pid"

Typedefs
typedef struct SerializedClientConnectionInfo	SerializedClientConnectionInfo

Functions
void	InitPostmasterChild (void)

void	InitStandaloneProcess (const char *argv0)

void	SwitchToSharedLatch (void)

void	InitProcessLocalLatch (void)

void	SwitchBackToLocalLatch (void)

const char *	GetBackendTypeDesc (BackendType backendType)

void	SetDatabasePath (const char *path)

void	checkDataDir (void)

void	SetDataDir (const char *dir)

void	ChangeToDataDir (void)

Oid	GetUserId (void)

Oid	GetOuterUserId (void)

static void	SetOuterUserId (Oid userid)

Oid	GetSessionUserId (void)

static void	SetSessionUserId (Oid userid, bool is_superuser)

const char *	GetSystemUser (void)

Oid	GetAuthenticatedUserId (void)

void	GetUserIdAndSecContext (Oid userid, int sec_context)

void	SetUserIdAndSecContext (Oid userid, int sec_context)

bool	InLocalUserIdChange (void)

bool	InSecurityRestrictedOperation (void)

bool	InNoForceRLSOperation (void)

void	GetUserIdAndContext (Oid userid, bool sec_def_context)

void	SetUserIdAndContext (Oid userid, bool sec_def_context)

bool	has_rolreplication (Oid roleid)

void	InitializeSessionUserId (const char *rolename, Oid roleid, bool bypass_login_check)

void	InitializeSessionUserIdStandalone (void)

void	InitializeSystemUser (const char authn_id, const char auth_method)

Datum	system_user (PG_FUNCTION_ARGS)

void	SetSessionAuthorization (Oid userid, bool is_superuser)

Oid	GetCurrentRoleId (void)

void	SetCurrentRoleId (Oid roleid, bool is_superuser)

char *	GetUserNameFromId (Oid roleid, bool noerr)

Size	EstimateClientConnectionInfoSpace (void)

void	SerializeClientConnectionInfo (Size maxsize, char *start_address)

void	RestoreClientConnectionInfo (char *conninfo)

static void	UnlinkLockFiles (int status, Datum arg)

static void	CreateLockFile (const char filename, bool amPostmaster, const char socketDir, bool isDDLock, const char *refName)

void	CreateDataDirLockFile (bool amPostmaster)

void	CreateSocketLockFile (const char socketfile, bool amPostmaster, const char socketDir)

void	TouchSocketLockFiles (void)

void	AddToDataDirLockFile (int target_line, const char *str)

bool	RecheckDataDirLockFile (void)

void	ValidatePgVersion (const char *path)

static void	load_libraries (const char libraries, const char gucname, bool restricted)

void	process_shared_preload_libraries (void)

void	process_session_preload_libraries (void)

void	process_shmem_requests (void)

void	pg_bindtextdomain (const char *domain)

Variables
ProcessingMode	Mode = InitProcessing

BackendType	MyBackendType

static List *	lock_files = NIL

static Latch	LocalLatchData

bool	IgnoreSystemIndexes = false

static Oid	AuthenticatedUserId = InvalidOid

static Oid	SessionUserId = InvalidOid

static Oid	OuterUserId = InvalidOid

static Oid	CurrentUserId = InvalidOid

static const char *	SystemUser = NULL

static bool	SessionUserIsSuperuser = false

static int	SecurityRestrictionContext = 0

static bool	SetRoleIsActive = false

ClientConnectionInfo	MyClientConnectionInfo

char *	session_preload_libraries_string = NULL

char *	shared_preload_libraries_string = NULL

char *	local_preload_libraries_string = NULL

bool	process_shared_preload_libraries_in_progress = false

bool	process_shared_preload_libraries_done = false

shmem_request_hook_type	shmem_request_hook = NULL

bool	process_shmem_requests_in_progress = false

Macro Definition Documentation

◆ DIRECTORY_LOCK_FILE

#define DIRECTORY_LOCK_FILE "postmaster.pid"

Definition at line 59 of file miscinit.c.

Typedef Documentation

◆ SerializedClientConnectionInfo

typedef struct SerializedClientConnectionInfo SerializedClientConnectionInfo

Function Documentation

◆ AddToDataDirLockFile()

void AddToDataDirLockFile	(	int	target_line,
		const char *	str
	)

Definition at line 1511 of file miscinit.c.

 {
     int         fd;
     int         len;
     int         lineno;
     char       *srcptr;
     char       *destptr;
     char        srcbuffer[BLCKSZ];
     char        destbuffer[BLCKSZ];
  
     fd = open(DIRECTORY_LOCK_FILE, O_RDWR | PG_BINARY, 0);
     if (fd < 0)
     {
         ereport(LOG,
                 (errcode_for_file_access(),
                  errmsg("could not open file \"%s\": %m",
                         DIRECTORY_LOCK_FILE)));
         return;
     }
     pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_ADDTODATADIR_READ);
     len = read(fd, srcbuffer, sizeof(srcbuffer) - 1);
     pgstat_report_wait_end();
     if (len < 0)
     {
         ereport(LOG,
                 (errcode_for_file_access(),
                  errmsg("could not read from file \"%s\": %m",
                         DIRECTORY_LOCK_FILE)));
         close(fd);
         return;
     }
     srcbuffer[len] = '\0';
  
     /*
      * Advance over lines we are not supposed to rewrite, then copy them to
      * destbuffer.
      */
     srcptr = srcbuffer;
     for (lineno = 1; lineno < target_line; lineno++)
     {
         char       *eol = strchr(srcptr, '\n');
  
         if (eol == NULL)
             break;              /* not enough lines in file yet */
         srcptr = eol + 1;
     }
     memcpy(destbuffer, srcbuffer, srcptr - srcbuffer);
     destptr = destbuffer + (srcptr - srcbuffer);
  
     /*
      * Fill in any missing lines before the target line, in case lines are
      * added to the file out of order.
      */
     for (; lineno < target_line; lineno++)
     {
         if (destptr < destbuffer + sizeof(destbuffer))
             *destptr++ = '\n';
     }
  
     /*
      * Write or rewrite the target line.
      */
     snprintf(destptr, destbuffer + sizeof(destbuffer) - destptr, "%s\n", str);
     destptr += strlen(destptr);
  
     /*
      * If there are more lines in the old file, append them to destbuffer.
      */
     if ((srcptr = strchr(srcptr, '\n')) != NULL)
     {
         srcptr++;
         snprintf(destptr, destbuffer + sizeof(destbuffer) - destptr, "%s",
                  srcptr);
     }
  
     /*
      * And rewrite the data.  Since we write in a single kernel call, this
      * update should appear atomic to onlookers.
      */
     len = strlen(destbuffer);
     errno = 0;
     pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_ADDTODATADIR_WRITE);
     if (pg_pwrite(fd, destbuffer, len, 0) != len)
     {
         pgstat_report_wait_end();
         /* if write didn't set errno, assume problem is no disk space */
         if (errno == 0)
             errno = ENOSPC;
         ereport(LOG,
                 (errcode_for_file_access(),
                  errmsg("could not write to file \"%s\": %m",
                         DIRECTORY_LOCK_FILE)));
         close(fd);
         return;
     }
     pgstat_report_wait_end();
     pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_ADDTODATADIR_SYNC);
     if (pg_fsync(fd) != 0)
     {
         ereport(LOG,
                 (errcode_for_file_access(),
                  errmsg("could not write to file \"%s\": %m",
                         DIRECTORY_LOCK_FILE)));
     }
     pgstat_report_wait_end();
     if (close(fd) != 0)
     {
         ereport(LOG,
                 (errcode_for_file_access(),
                  errmsg("could not write to file \"%s\": %m",
                         DIRECTORY_LOCK_FILE)));
     }
 }

References close, DIRECTORY_LOCK_FILE, ereport, errcode_for_file_access(), errmsg(), fd(), len, LOG, PG_BINARY, pg_fsync(), pg_pwrite, pgstat_report_wait_end(), pgstat_report_wait_start(), read, snprintf, and str.

Referenced by InternalIpcMemoryCreate(), PostmasterMain(), process_pm_child_exit(), process_pm_pmsignal(), and process_pm_shutdown_request().

◆ ChangeToDataDir()

void ChangeToDataDir ( void )

Definition at line 454 of file miscinit.c.

 {
     Assert(DataDir);
  
     if (chdir(DataDir) < 0)
         ereport(FATAL,
                 (errcode_for_file_access(),
                  errmsg("could not change directory to \"%s\": %m",
                         DataDir)));
 }

References Assert, DataDir, ereport, errcode_for_file_access(), errmsg(), and FATAL.

Referenced by BootstrapModeMain(), PostgresSingleUserMain(), and PostmasterMain().

◆ checkDataDir()

void checkDataDir ( void )

Definition at line 341 of file miscinit.c.

 {
     struct stat stat_buf;
  
     Assert(DataDir);
  
     if (stat(DataDir, &stat_buf) != 0)
     {
         if (errno == ENOENT)
             ereport(FATAL,
                     (errcode_for_file_access(),
                      errmsg("data directory \"%s\" does not exist",
                             DataDir)));
         else
             ereport(FATAL,
                     (errcode_for_file_access(),
                      errmsg("could not read permissions of directory \"%s\": %m",
                             DataDir)));
     }
  
     /* eventual chdir would fail anyway, but let's test ... */
     if (!S_ISDIR(stat_buf.st_mode))
         ereport(FATAL,
                 (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                  errmsg("specified data directory \"%s\" is not a directory",
                         DataDir)));
  
     /*
      * Check that the directory belongs to my userid; if not, reject.
      *
      * This check is an essential part of the interlock that prevents two
      * postmasters from starting in the same directory (see CreateLockFile()).
      * Do not remove or weaken it.
      *
      * XXX can we safely enable this check on Windows?
      */
 #if !defined(WIN32) && !defined(__CYGWIN__)
     if (stat_buf.st_uid != geteuid())
         ereport(FATAL,
                 (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                  errmsg("data directory \"%s\" has wrong ownership",
                         DataDir),
                  errhint("The server must be started by the user that owns the data directory.")));
 #endif
  
     /*
      * Check if the directory has correct permissions.  If not, reject.
      *
      * Only two possible modes are allowed, 0700 and 0750.  The latter mode
      * indicates that group read/execute should be allowed on all newly
      * created files and directories.
      *
      * XXX temporarily suppress check when on Windows, because there may not
      * be proper support for Unix-y file permissions.  Need to think of a
      * reasonable check to apply on Windows.
      */
 #if !defined(WIN32) && !defined(__CYGWIN__)
     if (stat_buf.st_mode & PG_MODE_MASK_GROUP)
         ereport(FATAL,
                 (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                  errmsg("data directory \"%s\" has invalid permissions",
                         DataDir),
                  errdetail("Permissions should be u=rwx (0700) or u=rwx,g=rx (0750).")));
 #endif
  
     /*
      * Reset creation modes and mask based on the mode of the data directory.
      *
      * The mask was set earlier in startup to disallow group permissions on
      * newly created files and directories.  However, if group read/execute
      * are present on the data directory then modify the create modes and mask
      * to allow group read/execute on newly created files and directories and
      * set the data_directory_mode GUC.
      *
      * Suppress when on Windows, because there may not be proper support for
      * Unix-y file permissions.
      */
 #if !defined(WIN32) && !defined(__CYGWIN__)
     SetDataDirectoryCreatePerm(stat_buf.st_mode);
  
     umask(pg_mode_mask);
     data_directory_mode = pg_dir_create_mode;
 #endif
  
     /* Check for PG_VERSION */
     ValidatePgVersion(DataDir);
 }

References Assert, data_directory_mode, DataDir, ereport, errcode(), errcode_for_file_access(), errdetail(), errhint(), errmsg(), FATAL, pg_dir_create_mode, pg_mode_mask, PG_MODE_MASK_GROUP, S_ISDIR, SetDataDirectoryCreatePerm(), stat::st_mode, stat::st_uid, stat, and ValidatePgVersion().

Referenced by BootstrapModeMain(), PostgresSingleUserMain(), and PostmasterMain().

◆ CreateDataDirLockFile()

void CreateDataDirLockFile ( bool amPostmaster )

Definition at line 1455 of file miscinit.c.

 {
     CreateLockFile(DIRECTORY_LOCK_FILE, amPostmaster, "", true, DataDir);
 }

References CreateLockFile(), DataDir, and DIRECTORY_LOCK_FILE.

Referenced by BootstrapModeMain(), PostgresSingleUserMain(), and PostmasterMain().

◆ CreateLockFile()

static void CreateLockFile	(	const char *	filename,
		bool	amPostmaster,
		const char *	socketDir,
		bool	isDDLock,
		const char *	refName
	)

static

Definition at line 1150 of file miscinit.c.

 {
     int         fd;
     char        buffer[MAXPGPATH * 2 + 256];
     int         ntries;
     int         len;
     int         encoded_pid;
     pid_t       other_pid;
     pid_t       my_pid,
                 my_p_pid,
                 my_gp_pid;
     const char *envvar;
  
     /*
      * If the PID in the lockfile is our own PID or our parent's or
      * grandparent's PID, then the file must be stale (probably left over from
      * a previous system boot cycle).  We need to check this because of the
      * likelihood that a reboot will assign exactly the same PID as we had in
      * the previous reboot, or one that's only one or two counts larger and
      * hence the lockfile's PID now refers to an ancestor shell process.  We
      * allow pg_ctl to pass down its parent shell PID (our grandparent PID)
      * via the environment variable PG_GRANDPARENT_PID; this is so that
      * launching the postmaster via pg_ctl can be just as reliable as
      * launching it directly.  There is no provision for detecting
      * further-removed ancestor processes, but if the init script is written
      * carefully then all but the immediate parent shell will be root-owned
      * processes and so the kill test will fail with EPERM.  Note that we
      * cannot get a false negative this way, because an existing postmaster
      * would surely never launch a competing postmaster or pg_ctl process
      * directly.
      */
     my_pid = getpid();
  
 #ifndef WIN32
     my_p_pid = getppid();
 #else
  
     /*
      * Windows hasn't got getppid(), but doesn't need it since it's not using
      * real kill() either...
      */
     my_p_pid = 0;
 #endif
  
     envvar = getenv("PG_GRANDPARENT_PID");
     if (envvar)
         my_gp_pid = atoi(envvar);
     else
         my_gp_pid = 0;
  
     /*
      * We need a loop here because of race conditions.  But don't loop forever
      * (for example, a non-writable $PGDATA directory might cause a failure
      * that won't go away).  100 tries seems like plenty.
      */
     for (ntries = 0;; ntries++)
     {
         /*
          * Try to create the lock file --- O_EXCL makes this atomic.
          *
          * Think not to make the file protection weaker than 0600/0640.  See
          * comments below.
          */
         fd = open(filename, O_RDWR | O_CREAT | O_EXCL, pg_file_create_mode);
         if (fd >= 0)
             break;              /* Success; exit the retry loop */
  
         /*
          * Couldn't create the pid file. Probably it already exists.
          */
         if ((errno != EEXIST && errno != EACCES) || ntries > 100)
             ereport(FATAL,
                     (errcode_for_file_access(),
                      errmsg("could not create lock file \"%s\": %m",
                             filename)));
  
         /*
          * Read the file to get the old owner's PID.  Note race condition
          * here: file might have been deleted since we tried to create it.
          */
         fd = open(filename, O_RDONLY, pg_file_create_mode);
         if (fd < 0)
         {
             if (errno == ENOENT)
                 continue;       /* race condition; try again */
             ereport(FATAL,
                     (errcode_for_file_access(),
                      errmsg("could not open lock file \"%s\": %m",
                             filename)));
         }
         pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_CREATE_READ);
         if ((len = read(fd, buffer, sizeof(buffer) - 1)) < 0)
             ereport(FATAL,
                     (errcode_for_file_access(),
                      errmsg("could not read lock file \"%s\": %m",
                             filename)));
         pgstat_report_wait_end();
         close(fd);
  
         if (len == 0)
         {
             ereport(FATAL,
                     (errcode(ERRCODE_LOCK_FILE_EXISTS),
                      errmsg("lock file \"%s\" is empty", filename),
                      errhint("Either another server is starting, or the lock file is the remnant of a previous server startup crash.")));
         }
  
         buffer[len] = '\0';
         encoded_pid = atoi(buffer);
  
         /* if pid < 0, the pid is for postgres, not postmaster */
         other_pid = (pid_t) (encoded_pid < 0 ? -encoded_pid : encoded_pid);
  
         if (other_pid <= 0)
             elog(FATAL, "bogus data in lock file \"%s\": \"%s\"",
                  filename, buffer);
  
         /*
          * Check to see if the other process still exists
          *
          * Per discussion above, my_pid, my_p_pid, and my_gp_pid can be
          * ignored as false matches.
          *
          * Normally kill() will fail with ESRCH if the given PID doesn't
          * exist.
          *
          * We can treat the EPERM-error case as okay because that error
          * implies that the existing process has a different userid than we
          * do, which means it cannot be a competing postmaster.  A postmaster
          * cannot successfully attach to a data directory owned by a userid
          * other than its own, as enforced in checkDataDir(). Also, since we
          * create the lockfiles mode 0600/0640, we'd have failed above if the
          * lockfile belonged to another userid --- which means that whatever
          * process kill() is reporting about isn't the one that made the
          * lockfile.  (NOTE: this last consideration is the only one that
          * keeps us from blowing away a Unix socket file belonging to an
          * instance of Postgres being run by someone else, at least on
          * machines where /tmp hasn't got a stickybit.)
          */
         if (other_pid != my_pid && other_pid != my_p_pid &&
             other_pid != my_gp_pid)
         {
             if (kill(other_pid, 0) == 0 ||
                 (errno != ESRCH && errno != EPERM))
             {
                 /* lockfile belongs to a live process */
                 ereport(FATAL,
                         (errcode(ERRCODE_LOCK_FILE_EXISTS),
                          errmsg("lock file \"%s\" already exists",
                                 filename),
                          isDDLock ?
                          (encoded_pid < 0 ?
                           errhint("Is another postgres (PID %d) running in data directory \"%s\"?",
                                   (int) other_pid, refName) :
                           errhint("Is another postmaster (PID %d) running in data directory \"%s\"?",
                                   (int) other_pid, refName)) :
                          (encoded_pid < 0 ?
                           errhint("Is another postgres (PID %d) using socket file \"%s\"?",
                                   (int) other_pid, refName) :
                           errhint("Is another postmaster (PID %d) using socket file \"%s\"?",
                                   (int) other_pid, refName))));
             }
         }
  
         /*
          * No, the creating process did not exist.  However, it could be that
          * the postmaster crashed (or more likely was kill -9'd by a clueless
          * admin) but has left orphan backends behind.  Check for this by
          * looking to see if there is an associated shmem segment that is
          * still in use.
          *
          * Note: because postmaster.pid is written in multiple steps, we might
          * not find the shmem ID values in it; we can't treat that as an
          * error.
          */
         if (isDDLock)
         {
             char       *ptr = buffer;
             unsigned long id1,
                         id2;
             int         lineno;
  
             for (lineno = 1; lineno < LOCK_FILE_LINE_SHMEM_KEY; lineno++)
             {
                 if ((ptr = strchr(ptr, '\n')) == NULL)
                     break;
                 ptr++;
             }
  
             if (ptr != NULL &&
                 sscanf(ptr, "%lu %lu", &id1, &id2) == 2)
             {
                 if (PGSharedMemoryIsInUse(id1, id2))
                     ereport(FATAL,
                             (errcode(ERRCODE_LOCK_FILE_EXISTS),
                              errmsg("pre-existing shared memory block (key %lu, ID %lu) is still in use",
                                     id1, id2),
                              errhint("Terminate any old server processes associated with data directory \"%s\".",
                                      refName)));
             }
         }
  
         /*
          * Looks like nobody's home.  Unlink the file and try again to create
          * it.  Need a loop because of possible race condition against other
          * would-be creators.
          */
         if (unlink(filename) < 0)
             ereport(FATAL,
                     (errcode_for_file_access(),
                      errmsg("could not remove old lock file \"%s\": %m",
                             filename),
                      errhint("The file seems accidentally left over, but "
                              "it could not be removed. Please remove the file "
                              "by hand and try again.")));
     }
  
     /*
      * Successfully created the file, now fill it.  See comment in pidfile.h
      * about the contents.  Note that we write the same first five lines into
      * both datadir and socket lockfiles; although more stuff may get added to
      * the datadir lockfile later.
      */
     snprintf(buffer, sizeof(buffer), "%d\n%s\n%ld\n%d\n%s\n",
              amPostmaster ? (int) my_pid : -((int) my_pid),
              DataDir,
              (long) MyStartTime,
              PostPortNumber,
              socketDir);
  
     /*
      * In a standalone backend, the next line (LOCK_FILE_LINE_LISTEN_ADDR)
      * will never receive data, so fill it in as empty now.
      */
     if (isDDLock && !amPostmaster)
         strlcat(buffer, "\n", sizeof(buffer));
  
     errno = 0;
     pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_CREATE_WRITE);
     if (write(fd, buffer, strlen(buffer)) != strlen(buffer))
     {
         int         save_errno = errno;
  
         close(fd);
         unlink(filename);
         /* if write didn't set errno, assume problem is no disk space */
         errno = save_errno ? save_errno : ENOSPC;
         ereport(FATAL,
                 (errcode_for_file_access(),
                  errmsg("could not write lock file \"%s\": %m", filename)));
     }
     pgstat_report_wait_end();
  
     pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_CREATE_SYNC);
     if (pg_fsync(fd) != 0)
     {
         int         save_errno = errno;
  
         close(fd);
         unlink(filename);
         errno = save_errno;
         ereport(FATAL,
                 (errcode_for_file_access(),
                  errmsg("could not write lock file \"%s\": %m", filename)));
     }
     pgstat_report_wait_end();
     if (close(fd) != 0)
     {
         int         save_errno = errno;
  
         unlink(filename);
         errno = save_errno;
         ereport(FATAL,
                 (errcode_for_file_access(),
                  errmsg("could not write lock file \"%s\": %m", filename)));
     }
  
     /*
      * Arrange to unlink the lock file(s) at proc_exit.  If this is the first
      * one, set up the on_proc_exit function to do it; then add this lock file
      * to the list of files to unlink.
      */
     if (lock_files == NIL)
         on_proc_exit(UnlinkLockFiles, 0);
  
     /*
      * Use lcons so that the lock files are unlinked in reverse order of
      * creation; this is critical!
      */
     lock_files = lcons(pstrdup(filename), lock_files);
 }

References close, DataDir, elog, ereport, errcode(), errcode_for_file_access(), errhint(), errmsg(), FATAL, fd(), filename, kill, lcons(), len, LOCK_FILE_LINE_SHMEM_KEY, lock_files, MAXPGPATH, MyStartTime, NIL, on_proc_exit(), pg_file_create_mode, pg_fsync(), PGSharedMemoryIsInUse(), pgstat_report_wait_end(), pgstat_report_wait_start(), PostPortNumber, pstrdup(), read, snprintf, strlcat(), UnlinkLockFiles(), and write.

Referenced by CreateDataDirLockFile(), and CreateSocketLockFile().

◆ CreateSocketLockFile()

void CreateSocketLockFile	(	const char *	socketfile,
		bool	amPostmaster,
		const char *	socketDir
	)

Definition at line 1464 of file miscinit.c.

 {
     char        lockfile[MAXPGPATH];
  
     snprintf(lockfile, sizeof(lockfile), "%s.lock", socketfile);
     CreateLockFile(lockfile, amPostmaster, socketDir, false, socketfile);
 }

References CreateLockFile(), MAXPGPATH, and snprintf.

Referenced by Lock_AF_UNIX().

◆ EstimateClientConnectionInfoSpace()

Size EstimateClientConnectionInfoSpace ( void )

Definition at line 1027 of file miscinit.c.

 {
     Size        size = 0;
  
     size = add_size(size, sizeof(SerializedClientConnectionInfo));
  
     if (MyClientConnectionInfo.authn_id)
         size = add_size(size, strlen(MyClientConnectionInfo.authn_id) + 1);
  
     return size;
 }

References add_size(), ClientConnectionInfo::authn_id, MyClientConnectionInfo, and size.

Referenced by InitializeParallelDSM().

◆ GetAuthenticatedUserId()

Oid GetAuthenticatedUserId ( void )

Definition at line 583 of file miscinit.c.

 {
     Assert(OidIsValid(AuthenticatedUserId));
     return AuthenticatedUserId;
 }

References Assert, AuthenticatedUserId, and OidIsValid.

Referenced by check_session_authorization(), and InitializeParallelDSM().

◆ GetBackendTypeDesc()

const char* GetBackendTypeDesc ( BackendType backendType )

Definition at line 263 of file miscinit.c.

 {
     const char *backendDesc = "unknown process type";
  
     switch (backendType)
     {
         case B_INVALID:
             backendDesc = "not initialized";
             break;
         case B_ARCHIVER:
             backendDesc = "archiver";
             break;
         case B_AUTOVAC_LAUNCHER:
             backendDesc = "autovacuum launcher";
             break;
         case B_AUTOVAC_WORKER:
             backendDesc = "autovacuum worker";
             break;
         case B_BACKEND:
             backendDesc = "client backend";
             break;
         case B_BG_WORKER:
             backendDesc = "background worker";
             break;
         case B_BG_WRITER:
             backendDesc = "background writer";
             break;
         case B_CHECKPOINTER:
             backendDesc = "checkpointer";
             break;
         case B_LOGGER:
             backendDesc = "logger";
             break;
         case B_SLOTSYNC_WORKER:
             backendDesc = "slotsync worker";
             break;
         case B_STANDALONE_BACKEND:
             backendDesc = "standalone backend";
             break;
         case B_STARTUP:
             backendDesc = "startup";
             break;
         case B_WAL_RECEIVER:
             backendDesc = "walreceiver";
             break;
         case B_WAL_SENDER:
             backendDesc = "walsender";
             break;
         case B_WAL_SUMMARIZER:
             backendDesc = "walsummarizer";
             break;
         case B_WAL_WRITER:
             backendDesc = "walwriter";
             break;
     }
  
     return backendDesc;
 }

References B_ARCHIVER, B_AUTOVAC_LAUNCHER, B_AUTOVAC_WORKER, B_BACKEND, B_BG_WORKER, B_BG_WRITER, B_CHECKPOINTER, B_INVALID, B_LOGGER, B_SLOTSYNC_WORKER, B_STANDALONE_BACKEND, B_STARTUP, B_WAL_RECEIVER, B_WAL_SENDER, B_WAL_SUMMARIZER, and B_WAL_WRITER.

Referenced by BackendInitialize(), get_backend_type_for_log(), init_ps_display(), pg_stat_get_activity(), and pg_stat_get_io().

◆ GetCurrentRoleId()

Oid GetCurrentRoleId ( void )

Definition at line 924 of file miscinit.c.

 {
     if (SetRoleIsActive)
         return OuterUserId;
     else
         return InvalidOid;
 }

References InvalidOid, OuterUserId, and SetRoleIsActive.

Referenced by InitializeParallelDSM(), and show_role().

◆ GetOuterUserId()

Oid GetOuterUserId ( void )

Definition at line 525 of file miscinit.c.

 {
     Assert(OidIsValid(OuterUserId));
     return OuterUserId;
 }

References Assert, OidIsValid, and OuterUserId.

Referenced by DropRole(), and RenameRole().

◆ GetSessionUserId()

Oid GetSessionUserId ( void )

Definition at line 548 of file miscinit.c.

 {
     Assert(OidIsValid(SessionUserId));
     return SessionUserId;
 }

References Assert, OidIsValid, and SessionUserId.

Referenced by check_role(), DropRole(), get_rolespec_oid(), get_rolespec_tuple(), InitPostgres(), pgstat_bestart(), RenameRole(), and session_user().

◆ GetSystemUser()

const char* GetSystemUser ( void )

Definition at line 574 of file miscinit.c.

 {
     return SystemUser;
 }

References SystemUser.

Referenced by system_user().

◆ GetUserId()

Oid GetUserId ( void )

Definition at line 514 of file miscinit.c.

 {
     Assert(OidIsValid(CurrentUserId));
     return CurrentUserId;
 }

References Assert, CurrentUserId, and OidIsValid.

◆ GetUserIdAndContext()

void GetUserIdAndContext	(	Oid *	userid,
		bool *	sec_def_context
	)

Definition at line 684 of file miscinit.c.

 {
     *userid = CurrentUserId;
     *sec_def_context = InLocalUserIdChange();
 }

References CurrentUserId, and InLocalUserIdChange().

◆ GetUserIdAndSecContext()

void GetUserIdAndSecContext	(	Oid *	userid,
		int *	sec_context
	)

Definition at line 635 of file miscinit.c.

 {
     *userid = CurrentUserId;
     *sec_context = SecurityRestrictionContext;
 }

References CurrentUserId, and SecurityRestrictionContext.

Referenced by brin_summarize_range(), bt_index_check_internal(), cluster_rel(), ComputeIndexAttrs(), CreateSchemaCommand(), DefineIndex(), do_analyze_rel(), execute_extension_script(), fmgr_security_definer(), index_build(), index_concurrently_build(), InitializeParallelDSM(), PushTransaction(), RefreshMatViewByOid(), reindex_index(), ReindexRelationConcurrently(), ri_PerformCheck(), ri_PlanCheck(), StartTransaction(), SwitchToUntrustedUser(), vacuum_rel(), and validate_index().

◆ GetUserNameFromId()

char* GetUserNameFromId	(	Oid	roleid,
		bool	noerr
	)

Definition at line 980 of file miscinit.c.

 {
     HeapTuple   tuple;
     char       *result;
  
     tuple = SearchSysCache1(AUTHOID, ObjectIdGetDatum(roleid));
     if (!HeapTupleIsValid(tuple))
     {
         if (!noerr)
             ereport(ERROR,
                     (errcode(ERRCODE_UNDEFINED_OBJECT),
                      errmsg("invalid role OID: %u", roleid)));
         result = NULL;
     }
     else
     {
         result = pstrdup(NameStr(((Form_pg_authid) GETSTRUCT(tuple))->rolname));
         ReleaseSysCache(tuple);
     }
     return result;
 }

References ereport, errcode(), errmsg(), ERROR, GETSTRUCT, HeapTupleIsValid, NameStr, ObjectIdGetDatum(), pstrdup(), ReleaseSysCache(), rolname, and SearchSysCache1().

Referenced by AddRoleMems(), check_can_set_role(), check_object_ownership(), check_role_grantor(), check_role_membership_authorization(), current_user(), DelRoleMems(), DropOwnedObjects(), execute_extension_script(), getObjectDescription(), getObjectIdentityParts(), insert_username(), LogicalRepSyncTableStart(), ReassignOwnedObjects(), regroleout(), session_user(), SwitchToUntrustedUser(), and TargetPrivilegesCheck().

◆ has_rolreplication()

bool has_rolreplication ( Oid roleid )

Definition at line 711 of file miscinit.c.

 {
     bool        result = false;
     HeapTuple   utup;
  
     /* Superusers bypass all permission checking. */
     if (superuser_arg(roleid))
         return true;
  
     utup = SearchSysCache1(AUTHOID, ObjectIdGetDatum(roleid));
     if (HeapTupleIsValid(utup))
     {
         result = ((Form_pg_authid) GETSTRUCT(utup))->rolreplication;
         ReleaseSysCache(utup);
     }
     return result;
 }

References GETSTRUCT, HeapTupleIsValid, ObjectIdGetDatum(), ReleaseSysCache(), rolreplication, SearchSysCache1(), and superuser_arg().

Referenced by AlterRole(), binary_upgrade_logical_slot_has_caught_up(), CheckSlotPermissions(), CreateRole(), and InitPostgres().

◆ InitializeSessionUserId()

void InitializeSessionUserId	(	const char *	rolename,
		Oid	roleid,
		bool	bypass_login_check
	)

Definition at line 733 of file miscinit.c.

 {
     HeapTuple   roleTup;
     Form_pg_authid rform;
     char       *rname;
     bool        is_superuser;
  
     /*
      * Don't do scans if we're bootstrapping, none of the system catalogs
      * exist yet, and they should be owned by postgres anyway.
      */
     Assert(!IsBootstrapProcessingMode());
  
     /* call only once */
     Assert(!OidIsValid(AuthenticatedUserId));
  
     /*
      * Make sure syscache entries are flushed for recent catalog changes. This
      * allows us to find roles that were created on-the-fly during
      * authentication.
      */
     AcceptInvalidationMessages();
  
     if (rolename != NULL)
     {
         roleTup = SearchSysCache1(AUTHNAME, PointerGetDatum(rolename));
         if (!HeapTupleIsValid(roleTup))
             ereport(FATAL,
                     (errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
                      errmsg("role \"%s\" does not exist", rolename)));
     }
     else
     {
         roleTup = SearchSysCache1(AUTHOID, ObjectIdGetDatum(roleid));
         if (!HeapTupleIsValid(roleTup))
             ereport(FATAL,
                     (errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
                      errmsg("role with OID %u does not exist", roleid)));
     }
  
     rform = (Form_pg_authid) GETSTRUCT(roleTup);
     roleid = rform->oid;
     rname = NameStr(rform->rolname);
  
     AuthenticatedUserId = roleid;
     is_superuser = rform->rolsuper;
  
     /* This sets OuterUserId/CurrentUserId too */
     SetSessionUserId(roleid, is_superuser);
  
     /* Also mark our PGPROC entry with the authenticated user id */
     /* (We assume this is an atomic store so no lock is needed) */
     MyProc->roleId = roleid;
  
     /*
      * These next checks are not enforced when in standalone mode, so that
      * there is a way to recover from sillinesses like "UPDATE pg_authid SET
      * rolcanlogin = false;".
      */
     if (IsUnderPostmaster)
     {
         /*
          * Is role allowed to login at all?
          */
         if (!bypass_login_check && !rform->rolcanlogin)
             ereport(FATAL,
                     (errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
                      errmsg("role \"%s\" is not permitted to log in",
                             rname)));
  
         /*
          * Check connection limit for this role.
          *
          * There is a race condition here --- we create our PGPROC before
          * checking for other PGPROCs.  If two backends did this at about the
          * same time, they might both think they were over the limit, while
          * ideally one should succeed and one fail.  Getting that to work
          * exactly seems more trouble than it is worth, however; instead we
          * just document that the connection limit is approximate.
          */
         if (rform->rolconnlimit >= 0 &&
             !is_superuser &&
             CountUserBackends(roleid) > rform->rolconnlimit)
             ereport(FATAL,
                     (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
                      errmsg("too many connections for role \"%s\"",
                             rname)));
     }
  
     /* Record username and superuser status as GUC settings too */
     SetConfigOption("session_authorization", rname,
                     PGC_BACKEND, PGC_S_OVERRIDE);
     SetConfigOption("is_superuser",
                     is_superuser ? "on" : "off",
                     PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
  
     ReleaseSysCache(roleTup);
 }

References AcceptInvalidationMessages(), Assert, AuthenticatedUserId, CountUserBackends(), ereport, errcode(), errmsg(), FATAL, GETSTRUCT, HeapTupleIsValid, is_superuser(), IsBootstrapProcessingMode, IsUnderPostmaster, MyProc, NameStr, ObjectIdGetDatum(), OidIsValid, PGC_BACKEND, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT, PGC_S_OVERRIDE, PointerGetDatum(), ReleaseSysCache(), PGPROC::roleId, SearchSysCache1(), SetConfigOption(), and SetSessionUserId().

Referenced by InitPostgres().

◆ InitializeSessionUserIdStandalone()

void InitializeSessionUserIdStandalone ( void )

Definition at line 837 of file miscinit.c.

 {
     /*
      * This function should only be called in single-user mode, in autovacuum
      * workers, in slot sync worker and in background workers.
      */
     Assert(!IsUnderPostmaster || AmAutoVacuumWorkerProcess() ||
            AmLogicalSlotSyncWorkerProcess() || AmBackgroundWorkerProcess());
  
     /* call only once */
     Assert(!OidIsValid(AuthenticatedUserId));
  
     AuthenticatedUserId = BOOTSTRAP_SUPERUSERID;
     SetSessionUserId(BOOTSTRAP_SUPERUSERID, true);
  
     /*
      * XXX This should set SetConfigOption("session_authorization"), too.
      * Since we don't, C code will get NULL, and current_setting() will get an
      * empty string.
      */
     SetConfigOption("is_superuser", "on",
                     PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
 }

References AmAutoVacuumWorkerProcess, AmBackgroundWorkerProcess, AmLogicalSlotSyncWorkerProcess, Assert, AuthenticatedUserId, IsUnderPostmaster, OidIsValid, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT, SetConfigOption(), and SetSessionUserId().

Referenced by InitPostgres().

◆ InitializeSystemUser()

void InitializeSystemUser	(	const char *	authn_id,
		const char *	auth_method
	)

Definition at line 867 of file miscinit.c.

 {
     char       *system_user;
  
     /* call only once */
     Assert(SystemUser == NULL);
  
     /*
      * InitializeSystemUser should be called only when authn_id is not NULL,
      * meaning that auth_method is valid.
      */
     Assert(authn_id != NULL);
  
     system_user = psprintf("%s:%s", auth_method, authn_id);
  
     /* Store SystemUser in long-lived storage */
     SystemUser = MemoryContextStrdup(TopMemoryContext, system_user);
     pfree(system_user);
 }

References Assert, MemoryContextStrdup(), pfree(), psprintf(), system_user(), SystemUser, and TopMemoryContext.

Referenced by InitPostgres(), and ParallelWorkerMain().

◆ InitPostmasterChild()

void InitPostmasterChild ( void )

Definition at line 95 of file miscinit.c.

 {
     IsUnderPostmaster = true;   /* we are a postmaster subprocess now */
  
     /*
      * Start our win32 signal implementation. This has to be done after we
      * read the backend variables, because we need to pick up the signal pipe
      * from the parent process.
      */
 #ifdef WIN32
     pgwin32_signal_initialize();
 #endif
  
     /*
      * Set reference point for stack-depth checking.  This might seem
      * redundant in !EXEC_BACKEND builds, but it's better to keep the depth
      * logic the same with and without that build option.
      */
     (void) set_stack_base();
  
     InitProcessGlobals();
  
     /*
      * make sure stderr is in binary mode before anything can possibly be
      * written to it, in case it's actually the syslogger pipe, so the pipe
      * chunking protocol isn't disturbed. Non-logpipe data gets translated on
      * redirection (e.g. via pg_ctl -l) anyway.
      */
 #ifdef WIN32
     _setmode(fileno(stderr), _O_BINARY);
 #endif
  
     /* We don't want the postmaster's proc_exit() handlers */
     on_exit_reset();
  
     /* In EXEC_BACKEND case we will not have inherited BlockSig etc values */
 #ifdef EXEC_BACKEND
     pqinitmask();
 #endif
  
     /* Initialize process-local latch support */
     InitializeLatchSupport();
     InitProcessLocalLatch();
     InitializeLatchWaitSet();
  
     /*
      * If possible, make this process a group leader, so that the postmaster
      * can signal any child processes too. Not all processes will have
      * children, but for consistency we make all postmaster child processes do
      * this.
      */
 #ifdef HAVE_SETSID
     if (setsid() < 0)
         elog(FATAL, "setsid() failed: %m");
 #endif
  
     /*
      * Every postmaster child process is expected to respond promptly to
      * SIGQUIT at all times.  Therefore we centrally remove SIGQUIT from
      * BlockSig and install a suitable signal handler.  (Client-facing
      * processes may choose to replace this default choice of handler with
      * quickdie().)  All other blockable signals remain blocked for now.
      */
     pqsignal(SIGQUIT, SignalHandlerForCrashExit);
  
     sigdelset(&BlockSig, SIGQUIT);
     sigprocmask(SIG_SETMASK, &BlockSig, NULL);
  
     /* Request a signal if the postmaster dies, if possible. */
     PostmasterDeathSignalInit();
  
     /* Don't give the pipe to subprograms that we execute. */
 #ifndef WIN32
     if (fcntl(postmaster_alive_fds[POSTMASTER_FD_WATCH], F_SETFD, FD_CLOEXEC) < 0)
         ereport(FATAL,
                 (errcode_for_socket_access(),
                  errmsg_internal("could not set postmaster death monitoring pipe to FD_CLOEXEC mode: %m")));
 #endif
 }

References BlockSig, elog, ereport, errcode_for_socket_access(), errmsg_internal(), FATAL, InitializeLatchSupport(), InitializeLatchWaitSet(), InitProcessGlobals(), InitProcessLocalLatch(), IsUnderPostmaster, on_exit_reset(), pgwin32_signal_initialize(), postmaster_alive_fds, POSTMASTER_FD_WATCH, PostmasterDeathSignalInit(), pqinitmask(), pqsignal(), set_stack_base(), SignalHandlerForCrashExit(), and SIGQUIT.

Referenced by postmaster_child_launch().

◆ InitProcessLocalLatch()

void InitProcessLocalLatch ( void )

Definition at line 241 of file miscinit.c.

 {
     MyLatch = &LocalLatchData;
     InitLatch(MyLatch);
 }

References InitLatch(), LocalLatchData, and MyLatch.

Referenced by InitPostmasterChild(), InitStandaloneProcess(), and PostmasterMain().

◆ InitStandaloneProcess()

void InitStandaloneProcess ( const char * argv0 )

Definition at line 181 of file miscinit.c.

 {
     Assert(!IsPostmasterEnvironment);
  
     MyBackendType = B_STANDALONE_BACKEND;
  
     /*
      * Start our win32 signal implementation
      */
 #ifdef WIN32
     pgwin32_signal_initialize();
 #endif
  
     InitProcessGlobals();
  
     /* Initialize process-local latch support */
     InitializeLatchSupport();
     InitProcessLocalLatch();
     InitializeLatchWaitSet();
  
     /*
      * For consistency with InitPostmasterChild, initialize signal mask here.
      * But we don't unblock SIGQUIT or provide a default handler for it.
      */
     pqinitmask();
     sigprocmask(SIG_SETMASK, &BlockSig, NULL);
  
     /* Compute paths, no postmaster to inherit from */
     if (my_exec_path[0] == '\0')
     {
         if (find_my_exec(argv0, my_exec_path) < 0)
             elog(FATAL, "%s: could not locate my own executable path",
                  argv0);
     }
  
     if (pkglib_path[0] == '\0')
         get_pkglib_path(my_exec_path, pkglib_path);
 }

References argv0, Assert, B_STANDALONE_BACKEND, BlockSig, elog, FATAL, find_my_exec(), get_pkglib_path(), InitializeLatchSupport(), InitializeLatchWaitSet(), InitProcessGlobals(), InitProcessLocalLatch(), IsPostmasterEnvironment, my_exec_path, MyBackendType, pgwin32_signal_initialize(), pkglib_path, and pqinitmask().

Referenced by BootstrapModeMain(), and PostgresSingleUserMain().

◆ InLocalUserIdChange()

bool InLocalUserIdChange ( void )

Definition at line 653 of file miscinit.c.

 {
     return (SecurityRestrictionContext & SECURITY_LOCAL_USERID_CHANGE) != 0;
 }

References SECURITY_LOCAL_USERID_CHANGE, and SecurityRestrictionContext.

Referenced by GetUserIdAndContext(), and set_config_with_handle().

◆ InNoForceRLSOperation()

bool InNoForceRLSOperation ( void )

Definition at line 671 of file miscinit.c.

 {
     return (SecurityRestrictionContext & SECURITY_NOFORCE_RLS) != 0;
 }

References SECURITY_NOFORCE_RLS, and SecurityRestrictionContext.

Referenced by check_enable_rls().

◆ InSecurityRestrictedOperation()

bool InSecurityRestrictedOperation ( void )

Definition at line 662 of file miscinit.c.

 {
     return (SecurityRestrictionContext & SECURITY_RESTRICTED_OPERATION) != 0;
 }

References SECURITY_RESTRICTED_OPERATION, and SecurityRestrictionContext.

Referenced by afterTriggerMarkEvents(), CheckRestrictedOperation(), DefineRelation(), PerformCursorOpen(), set_config_with_handle(), and SetUserIdAndContext().

◆ load_libraries()

static void load_libraries	(	const char *	libraries,
		const char *	gucname,
		bool	restricted
	)

static

Definition at line 1791 of file miscinit.c.

 {
     char       *rawstring;
     List       *elemlist;
     ListCell   *l;
  
     if (libraries == NULL || libraries[0] == '\0')
         return;                 /* nothing to do */
  
     /* Need a modifiable copy of string */
     rawstring = pstrdup(libraries);
  
     /* Parse string into list of filename paths */
     if (!SplitDirectoriesString(rawstring, ',', &elemlist))
     {
         /* syntax error in list */
         list_free_deep(elemlist);
         pfree(rawstring);
         ereport(LOG,
                 (errcode(ERRCODE_SYNTAX_ERROR),
                  errmsg("invalid list syntax in parameter \"%s\"",
                         gucname)));
         return;
     }
  
     foreach(l, elemlist)
     {
         /* Note that filename was already canonicalized */
         char       *filename = (char *) lfirst(l);
         char       *expanded = NULL;
  
         /* If restricting, insert $libdir/plugins if not mentioned already */
         if (restricted && first_dir_separator(filename) == NULL)
         {
             expanded = psprintf("$libdir/plugins/%s", filename);
             filename = expanded;
         }
         load_file(filename, restricted);
         ereport(DEBUG1,
                 (errmsg_internal("loaded library \"%s\"", filename)));
         if (expanded)
             pfree(expanded);
     }
  
     list_free_deep(elemlist);
     pfree(rawstring);
 }

References DEBUG1, ereport, errcode(), errmsg(), errmsg_internal(), filename, first_dir_separator(), lfirst, list_free_deep(), load_file(), LOG, pfree(), psprintf(), pstrdup(), and SplitDirectoriesString().

Referenced by process_session_preload_libraries(), and process_shared_preload_libraries().

◆ pg_bindtextdomain()

void pg_bindtextdomain ( const char * domain )

Definition at line 1880 of file miscinit.c.

 {
 #ifdef ENABLE_NLS
     if (my_exec_path[0] != '\0')
     {
         char        locale_path[MAXPGPATH];
  
         get_locale_path(my_exec_path, locale_path);
         bindtextdomain(domain, locale_path);
         pg_bind_textdomain_codeset(domain);
     }
 #endif
 }

References get_locale_path(), MAXPGPATH, and my_exec_path.

Referenced by _PG_init().

◆ process_session_preload_libraries()

void process_session_preload_libraries ( void )

Definition at line 1857 of file miscinit.c.

 {
     load_libraries(session_preload_libraries_string,
                    "session_preload_libraries",
                    false);
     load_libraries(local_preload_libraries_string,
                    "local_preload_libraries",
                    true);
 }

References load_libraries(), local_preload_libraries_string, and session_preload_libraries_string.

Referenced by InitPostgres().

◆ process_shared_preload_libraries()

void process_shared_preload_libraries ( void )

Definition at line 1843 of file miscinit.c.

 {
     process_shared_preload_libraries_in_progress = true;
     load_libraries(shared_preload_libraries_string,
                    "shared_preload_libraries",
                    false);
     process_shared_preload_libraries_in_progress = false;
     process_shared_preload_libraries_done = true;
 }

References load_libraries(), process_shared_preload_libraries_done, process_shared_preload_libraries_in_progress, and shared_preload_libraries_string.

Referenced by PostgresSingleUserMain(), and PostmasterMain().

◆ process_shmem_requests()

void process_shmem_requests ( void )

Definition at line 1871 of file miscinit.c.

 {
     process_shmem_requests_in_progress = true;
     if (shmem_request_hook)
         shmem_request_hook();
     process_shmem_requests_in_progress = false;
 }

References process_shmem_requests_in_progress, and shmem_request_hook.

Referenced by PostgresSingleUserMain(), and PostmasterMain().

◆ RecheckDataDirLockFile()

bool RecheckDataDirLockFile ( void )

Definition at line 1638 of file miscinit.c.

 {
     int         fd;
     int         len;
     long        file_pid;
     char        buffer[BLCKSZ];
  
     fd = open(DIRECTORY_LOCK_FILE, O_RDWR | PG_BINARY, 0);
     if (fd < 0)
     {
         /*
          * There are many foreseeable false-positive error conditions.  For
          * safety, fail only on enumerated clearly-something-is-wrong
          * conditions.
          */
         switch (errno)
         {
             case ENOENT:
             case ENOTDIR:
                 /* disaster */
                 ereport(LOG,
                         (errcode_for_file_access(),
                          errmsg("could not open file \"%s\": %m",
                                 DIRECTORY_LOCK_FILE)));
                 return false;
             default:
                 /* non-fatal, at least for now */
                 ereport(LOG,
                         (errcode_for_file_access(),
                          errmsg("could not open file \"%s\": %m; continuing anyway",
                                 DIRECTORY_LOCK_FILE)));
                 return true;
         }
     }
     pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_RECHECKDATADIR_READ);
     len = read(fd, buffer, sizeof(buffer) - 1);
     pgstat_report_wait_end();
     if (len < 0)
     {
         ereport(LOG,
                 (errcode_for_file_access(),
                  errmsg("could not read from file \"%s\": %m",
                         DIRECTORY_LOCK_FILE)));
         close(fd);
         return true;            /* treat read failure as nonfatal */
     }
     buffer[len] = '\0';
     close(fd);
     file_pid = atol(buffer);
     if (file_pid == getpid())
         return true;            /* all is well */
  
     /* Trouble: someone's overwritten the lock file */
     ereport(LOG,
             (errmsg("lock file \"%s\" contains wrong PID: %ld instead of %ld",
                     DIRECTORY_LOCK_FILE, file_pid, (long) getpid())));
     return false;
 }

References close, DIRECTORY_LOCK_FILE, ereport, errcode_for_file_access(), errmsg(), fd(), len, LOG, PG_BINARY, pgstat_report_wait_end(), pgstat_report_wait_start(), and read.

Referenced by ServerLoop().

◆ RestoreClientConnectionInfo()

void RestoreClientConnectionInfo ( char * conninfo )

Definition at line 1075 of file miscinit.c.

 {
     SerializedClientConnectionInfo serialized;
  
     memcpy(&serialized, conninfo, sizeof(serialized));
  
     /* Copy the fields back into place */
     MyClientConnectionInfo.authn_id = NULL;
     MyClientConnectionInfo.auth_method = serialized.auth_method;
  
     if (serialized.authn_id_len >= 0)
     {
         char       *authn_id;
  
         authn_id = conninfo + sizeof(serialized);
         MyClientConnectionInfo.authn_id = MemoryContextStrdup(TopMemoryContext,
                                                               authn_id);
     }
 }

References SerializedClientConnectionInfo::auth_method, ClientConnectionInfo::auth_method, ClientConnectionInfo::authn_id, SerializedClientConnectionInfo::authn_id_len, MemoryContextStrdup(), MyClientConnectionInfo, and TopMemoryContext.

Referenced by ParallelWorkerMain().

◆ SerializeClientConnectionInfo()

void SerializeClientConnectionInfo	(	Size	maxsize,
		char *	start_address
	)

Definition at line 1043 of file miscinit.c.

 {
     SerializedClientConnectionInfo serialized = {0};
  
     serialized.authn_id_len = -1;
     serialized.auth_method = MyClientConnectionInfo.auth_method;
  
     if (MyClientConnectionInfo.authn_id)
         serialized.authn_id_len = strlen(MyClientConnectionInfo.authn_id);
  
     /* Copy serialized representation to buffer */
     Assert(maxsize >= sizeof(serialized));
     memcpy(start_address, &serialized, sizeof(serialized));
  
     maxsize -= sizeof(serialized);
     start_address += sizeof(serialized);
  
     /* Copy authn_id into the space after the struct */
     if (serialized.authn_id_len >= 0)
     {
         Assert(maxsize >= (serialized.authn_id_len + 1));
         memcpy(start_address,
                MyClientConnectionInfo.authn_id,
         /* include the NULL terminator to ease deserialization */
                serialized.authn_id_len + 1);
     }
 }

References Assert, SerializedClientConnectionInfo::auth_method, ClientConnectionInfo::auth_method, ClientConnectionInfo::authn_id, SerializedClientConnectionInfo::authn_id_len, and MyClientConnectionInfo.

Referenced by InitializeParallelDSM().

◆ SetCurrentRoleId()

void SetCurrentRoleId	(	Oid	roleid,
		bool	is_superuser
	)

Definition at line 945 of file miscinit.c.

 {
     /*
      * Get correct info if it's SET ROLE NONE
      *
      * If SessionUserId hasn't been set yet, just do nothing --- the eventual
      * SetSessionUserId call will fix everything.  This is needed since we
      * will get called during GUC initialization.
      */
     if (!OidIsValid(roleid))
     {
         if (!OidIsValid(SessionUserId))
             return;
  
         roleid = SessionUserId;
         is_superuser = SessionUserIsSuperuser;
  
         SetRoleIsActive = false;
     }
     else
         SetRoleIsActive = true;
  
     SetOuterUserId(roleid);
  
     SetConfigOption("is_superuser",
                     is_superuser ? "on" : "off",
                     PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
 }

References is_superuser(), OidIsValid, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT, SessionUserId, SessionUserIsSuperuser, SetConfigOption(), SetOuterUserId(), and SetRoleIsActive.

Referenced by assign_role(), and ParallelWorkerMain().

◆ SetDatabasePath()

void SetDatabasePath ( const char * path )

Definition at line 328 of file miscinit.c.

 {
     /* This should happen only once per process */
     Assert(!DatabasePath);
     DatabasePath = MemoryContextStrdup(TopMemoryContext, path);
 }

References Assert, DatabasePath, MemoryContextStrdup(), and TopMemoryContext.

Referenced by InitPostgres().

◆ SetDataDir()

void SetDataDir ( const char * dir )

Definition at line 434 of file miscinit.c.

 {
     char       *new;
  
     Assert(dir);
  
     /* If presented path is relative, convert to absolute */
     new = make_absolute_path(dir);
  
     free(DataDir);
     DataDir = new;
 }

References Assert, DataDir, free, and make_absolute_path().

Referenced by SelectConfigFiles().

◆ SetOuterUserId()

static void SetOuterUserId ( Oid userid )

static

Definition at line 533 of file miscinit.c.

 {
     Assert(SecurityRestrictionContext == 0);
     Assert(OidIsValid(userid));
     OuterUserId = userid;
  
     /* We force the effective user ID to match, too */
     CurrentUserId = userid;
 }

References Assert, CurrentUserId, OidIsValid, OuterUserId, and SecurityRestrictionContext.

Referenced by SetCurrentRoleId().

◆ SetSessionAuthorization()

void SetSessionAuthorization	(	Oid	userid,
		bool	is_superuser
	)

Definition at line 908 of file miscinit.c.

 {
     SetSessionUserId(userid, is_superuser);
  
     SetConfigOption("is_superuser",
                     is_superuser ? "on" : "off",
                     PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
 }

References is_superuser(), PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT, SetConfigOption(), and SetSessionUserId().

Referenced by assign_session_authorization().

◆ SetSessionUserId()

static void SetSessionUserId	(	Oid	userid,
		bool	is_superuser
	)

static

Definition at line 556 of file miscinit.c.

 {
     Assert(SecurityRestrictionContext == 0);
     Assert(OidIsValid(userid));
     SessionUserId = userid;
     SessionUserIsSuperuser = is_superuser;
     SetRoleIsActive = false;
  
     /* We force the effective user IDs to match, too */
     OuterUserId = userid;
     CurrentUserId = userid;
 }

References Assert, CurrentUserId, is_superuser(), OidIsValid, OuterUserId, SecurityRestrictionContext, SessionUserId, SessionUserIsSuperuser, and SetRoleIsActive.

Referenced by InitializeSessionUserId(), InitializeSessionUserIdStandalone(), and SetSessionAuthorization().

◆ SetUserIdAndContext()

void SetUserIdAndContext	(	Oid	userid,
		bool	sec_def_context
	)

Definition at line 691 of file miscinit.c.

 {
     /* We throw the same error SET ROLE would. */
     if (InSecurityRestrictedOperation())
         ereport(ERROR,
                 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                  errmsg("cannot set parameter \"%s\" within security-restricted operation",
                         "role")));
     CurrentUserId = userid;
     if (sec_def_context)
         SecurityRestrictionContext |= SECURITY_LOCAL_USERID_CHANGE;
     else
         SecurityRestrictionContext &= ~SECURITY_LOCAL_USERID_CHANGE;
 }

References CurrentUserId, ereport, errcode(), errmsg(), ERROR, InSecurityRestrictedOperation(), SECURITY_LOCAL_USERID_CHANGE, and SecurityRestrictionContext.

◆ SetUserIdAndSecContext()

void SetUserIdAndSecContext	(	Oid	userid,
		int	sec_context
	)

Definition at line 642 of file miscinit.c.

 {
     CurrentUserId = userid;
     SecurityRestrictionContext = sec_context;
 }

References CurrentUserId, and SecurityRestrictionContext.

Referenced by AbortSubTransaction(), AbortTransaction(), brin_summarize_range(), bt_index_check_internal(), cluster_rel(), ComputeIndexAttrs(), CreateSchemaCommand(), DefineIndex(), do_analyze_rel(), execute_extension_script(), fmgr_security_definer(), index_build(), index_concurrently_build(), ParallelWorkerMain(), refresh_by_match_merge(), RefreshMatViewByOid(), reindex_index(), ReindexRelationConcurrently(), RestoreUserContext(), ri_PerformCheck(), ri_PlanCheck(), SwitchToUntrustedUser(), vacuum_rel(), and validate_index().

◆ SwitchBackToLocalLatch()

void SwitchBackToLocalLatch ( void )

Definition at line 248 of file miscinit.c.

 {
     Assert(MyLatch != &LocalLatchData);
     Assert(MyProc != NULL && MyLatch == &MyProc->procLatch);
  
     MyLatch = &LocalLatchData;
  
     if (FeBeWaitSet)
         ModifyWaitEvent(FeBeWaitSet, FeBeWaitSetLatchPos, WL_LATCH_SET,
                         MyLatch);
  
     SetLatch(MyLatch);
 }

References Assert, FeBeWaitSet, FeBeWaitSetLatchPos, LocalLatchData, ModifyWaitEvent(), MyLatch, MyProc, PGPROC::procLatch, SetLatch(), and WL_LATCH_SET.

Referenced by AuxiliaryProcKill(), and ProcKill().

◆ SwitchToSharedLatch()

void SwitchToSharedLatch ( void )

Definition at line 221 of file miscinit.c.

 {
     Assert(MyLatch == &LocalLatchData);
     Assert(MyProc != NULL);
  
     MyLatch = &MyProc->procLatch;
  
     if (FeBeWaitSet)
         ModifyWaitEvent(FeBeWaitSet, FeBeWaitSetLatchPos, WL_LATCH_SET,
                         MyLatch);
  
     /*
      * Set the shared latch as the local one might have been set. This
      * shouldn't normally be necessary as code is supposed to check the
      * condition before waiting for the latch, but a bit care can't hurt.
      */
     SetLatch(MyLatch);
 }

References Assert, FeBeWaitSet, FeBeWaitSetLatchPos, LocalLatchData, ModifyWaitEvent(), MyLatch, MyProc, PGPROC::procLatch, SetLatch(), and WL_LATCH_SET.

Referenced by InitAuxiliaryProcess(), and InitProcess().

◆ system_user()

Datum system_user ( PG_FUNCTION_ARGS )

Definition at line 891 of file miscinit.c.

 {
     const char *sysuser = GetSystemUser();
  
     if (sysuser)
         PG_RETURN_DATUM(CStringGetTextDatum(sysuser));
     else
         PG_RETURN_NULL();
 }

References CStringGetTextDatum, GetSystemUser(), PG_RETURN_DATUM, and PG_RETURN_NULL.

Referenced by check_ident_usermap(), check_usermap(), and InitializeSystemUser().

◆ TouchSocketLockFiles()

void TouchSocketLockFiles ( void )

Definition at line 1482 of file miscinit.c.

 {
     ListCell   *l;
  
     foreach(l, lock_files)
     {
         char       *socketLockFile = (char *) lfirst(l);
  
         /* No need to touch the data directory lock file, we trust */
         if (strcmp(socketLockFile, DIRECTORY_LOCK_FILE) == 0)
             continue;
  
         /* we just ignore any error here */
         (void) utime(socketLockFile, NULL);
     }
 }

References DIRECTORY_LOCK_FILE, lfirst, and lock_files.

Referenced by ServerLoop().

◆ UnlinkLockFiles()

static void UnlinkLockFiles	(	int	status,
		Datum	arg
	)

static

Definition at line 1115 of file miscinit.c.

 {
     ListCell   *l;
  
     foreach(l, lock_files)
     {
         char       *curfile = (char *) lfirst(l);
  
         unlink(curfile);
         /* Should we complain if the unlink fails? */
     }
     /* Since we're about to exit, no need to reclaim storage */
     lock_files = NIL;
  
     /*
      * Lock file removal should always be the last externally visible action
      * of a postmaster or standalone backend, while we won't come here at all
      * when exiting postmaster child processes.  Therefore, this is a good
      * place to log completion of shutdown.  We could alternatively teach
      * proc_exit() to do it, but that seems uglier.  In a standalone backend,
      * use NOTICE elevel to be less chatty.
      */
     ereport(IsPostmasterEnvironment ? LOG : NOTICE,
             (errmsg("database system is shut down")));
 }

References ereport, errmsg(), IsPostmasterEnvironment, lfirst, lock_files, LOG, NIL, and NOTICE.

Referenced by CreateLockFile().

◆ ValidatePgVersion()

void ValidatePgVersion ( const char * path )

Definition at line 1710 of file miscinit.c.

 {
     char        full_path[MAXPGPATH];
     FILE       *file;
     int         ret;
     long        file_major;
     long        my_major;
     char       *endptr;
     char        file_version_string[64];
     const char *my_version_string = PG_VERSION;
  
     my_major = strtol(my_version_string, &endptr, 10);
  
     snprintf(full_path, sizeof(full_path), "%s/PG_VERSION", path);
  
     file = AllocateFile(full_path, "r");
     if (!file)
     {
         if (errno == ENOENT)
             ereport(FATAL,
                     (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                      errmsg("\"%s\" is not a valid data directory",
                             path),
                      errdetail("File \"%s\" is missing.", full_path)));
         else
             ereport(FATAL,
                     (errcode_for_file_access(),
                      errmsg("could not open file \"%s\": %m", full_path)));
     }
  
     file_version_string[0] = '\0';
     ret = fscanf(file, "%63s", file_version_string);
     file_major = strtol(file_version_string, &endptr, 10);
  
     if (ret != 1 || endptr == file_version_string)
         ereport(FATAL,
                 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                  errmsg("\"%s\" is not a valid data directory",
                         path),
                  errdetail("File \"%s\" does not contain valid data.",
                            full_path),
                  errhint("You might need to initdb.")));
  
     FreeFile(file);
  
     if (my_major != file_major)
         ereport(FATAL,
                 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                  errmsg("database files are incompatible with server"),
                  errdetail("The data directory was initialized by PostgreSQL version %s, "
                            "which is not compatible with this version %s.",
                            file_version_string, my_version_string)));
 }

References AllocateFile(), ereport, errcode(), errcode_for_file_access(), errdetail(), errhint(), errmsg(), FATAL, FreeFile(), MAXPGPATH, and snprintf.

Referenced by checkDataDir(), and InitPostgres().

Variable Documentation

◆ AuthenticatedUserId

Oid AuthenticatedUserId = InvalidOid

static

Definition at line 494 of file miscinit.c.

Referenced by GetAuthenticatedUserId(), InitializeSessionUserId(), and InitializeSessionUserIdStandalone().

◆ CurrentUserId

Oid CurrentUserId = InvalidOid

static

Definition at line 497 of file miscinit.c.

Referenced by GetUserId(), GetUserIdAndContext(), GetUserIdAndSecContext(), SetOuterUserId(), SetSessionUserId(), SetUserIdAndContext(), and SetUserIdAndSecContext().

◆ IgnoreSystemIndexes

bool IgnoreSystemIndexes = false

Definition at line 80 of file miscinit.c.

Referenced by AuxiliaryProcessMainCommon(), BootstrapModeMain(), get_relation_info(), systable_beginscan(), and systable_beginscan_ordered().

◆ local_preload_libraries_string

char* local_preload_libraries_string = NULL

Definition at line 1775 of file miscinit.c.

Referenced by process_session_preload_libraries().

◆ LocalLatchData

Latch LocalLatchData

static

Definition at line 68 of file miscinit.c.

Referenced by InitProcessLocalLatch(), SwitchBackToLocalLatch(), and SwitchToSharedLatch().

◆ lock_files

List* lock_files = NIL

static

Definition at line 66 of file miscinit.c.

Referenced by CreateLockFile(), TouchSocketLockFiles(), and UnlinkLockFiles().

◆ Mode

ProcessingMode Mode = InitProcessing

Definition at line 61 of file miscinit.c.

◆ MyBackendType

◆ MyClientConnectionInfo

ClientConnectionInfo MyClientConnectionInfo

Definition at line 1010 of file miscinit.c.

Referenced by auth_peer(), ClientAuthentication(), EstimateClientConnectionInfoSpace(), InitPostgres(), ParallelWorkerMain(), RestoreClientConnectionInfo(), SerializeClientConnectionInfo(), and set_authn_id().

◆ OuterUserId

Oid OuterUserId = InvalidOid

static

Definition at line 496 of file miscinit.c.

Referenced by GetCurrentRoleId(), GetOuterUserId(), SetOuterUserId(), and SetSessionUserId().

◆ process_shared_preload_libraries_done

bool process_shared_preload_libraries_done = false

Definition at line 1779 of file miscinit.c.

Referenced by check_wal_consistency_checking(), InitializeWalConsistencyChecking(), and process_shared_preload_libraries().

◆ process_shared_preload_libraries_in_progress

bool process_shared_preload_libraries_in_progress = false

Definition at line 1778 of file miscinit.c.

Referenced by _PG_init(), apw_start_leader_worker(), init_custom_variable(), pgstat_register_kind(), process_shared_preload_libraries(), RegisterBackgroundWorker(), and RegisterCustomRmgr().

◆ process_shmem_requests_in_progress

bool process_shmem_requests_in_progress = false

Definition at line 1782 of file miscinit.c.

Referenced by process_shmem_requests(), RequestAddinShmemSpace(), and RequestNamedLWLockTranche().

◆ SecurityRestrictionContext

int SecurityRestrictionContext = 0

static

Definition at line 503 of file miscinit.c.

Referenced by GetUserIdAndSecContext(), InLocalUserIdChange(), InNoForceRLSOperation(), InSecurityRestrictedOperation(), SetOuterUserId(), SetSessionUserId(), SetUserIdAndContext(), and SetUserIdAndSecContext().

◆ session_preload_libraries_string

char* session_preload_libraries_string = NULL

Definition at line 1773 of file miscinit.c.

Referenced by process_session_preload_libraries().

◆ SessionUserId

Oid SessionUserId = InvalidOid

static

Definition at line 495 of file miscinit.c.

Referenced by GetSessionUserId(), SetCurrentRoleId(), and SetSessionUserId().

◆ SessionUserIsSuperuser

bool SessionUserIsSuperuser = false

static

Definition at line 501 of file miscinit.c.

Referenced by SetCurrentRoleId(), and SetSessionUserId().

◆ SetRoleIsActive

bool SetRoleIsActive = false

static

Definition at line 506 of file miscinit.c.

Referenced by GetCurrentRoleId(), SetCurrentRoleId(), and SetSessionUserId().

◆ shared_preload_libraries_string

char* shared_preload_libraries_string = NULL

Definition at line 1774 of file miscinit.c.

Referenced by process_shared_preload_libraries().

◆ shmem_request_hook

shmem_request_hook_type shmem_request_hook = NULL

Definition at line 1781 of file miscinit.c.

Referenced by _PG_init(), and process_shmem_requests().

◆ SystemUser

const char* SystemUser = NULL

static

Definition at line 498 of file miscinit.c.

Referenced by GetSystemUser(), and InitializeSystemUser().

Data Structures

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

◆ DIRECTORY_LOCK_FILE

Typedef Documentation

◆ SerializedClientConnectionInfo

Function Documentation

◆ AddToDataDirLockFile()

◆ ChangeToDataDir()

◆ checkDataDir()

◆ CreateDataDirLockFile()

◆ CreateLockFile()

◆ CreateSocketLockFile()

◆ EstimateClientConnectionInfoSpace()

◆ GetAuthenticatedUserId()

◆ GetBackendTypeDesc()

◆ GetCurrentRoleId()

◆ GetOuterUserId()

◆ GetSessionUserId()

◆ GetSystemUser()

◆ GetUserId()

◆ GetUserIdAndContext()

◆ GetUserIdAndSecContext()

◆ GetUserNameFromId()

◆ has_rolreplication()

◆ InitializeSessionUserId()

◆ InitializeSessionUserIdStandalone()

◆ InitializeSystemUser()

◆ InitPostmasterChild()

◆ InitProcessLocalLatch()

◆ InitStandaloneProcess()

◆ InLocalUserIdChange()

◆ InNoForceRLSOperation()

◆ InSecurityRestrictedOperation()

◆ load_libraries()

◆ pg_bindtextdomain()

◆ process_session_preload_libraries()

◆ process_shared_preload_libraries()

◆ process_shmem_requests()

◆ RecheckDataDirLockFile()

◆ RestoreClientConnectionInfo()

◆ SerializeClientConnectionInfo()

◆ SetCurrentRoleId()

◆ SetDatabasePath()

◆ SetDataDir()

◆ SetOuterUserId()

◆ SetSessionAuthorization()

◆ SetSessionUserId()

◆ SetUserIdAndContext()

◆ SetUserIdAndSecContext()

◆ SwitchBackToLocalLatch()

◆ SwitchToSharedLatch()

◆ system_user()

◆ TouchSocketLockFiles()

◆ UnlinkLockFiles()

◆ ValidatePgVersion()

Variable Documentation

◆ AuthenticatedUserId

◆ CurrentUserId

◆ IgnoreSystemIndexes

◆ local_preload_libraries_string

◆ LocalLatchData

◆ lock_files

◆ Mode

◆ MyBackendType

◆ MyClientConnectionInfo

◆ OuterUserId

◆ process_shared_preload_libraries_done

◆ process_shared_preload_libraries_in_progress

◆ process_shmem_requests_in_progress

◆ SecurityRestrictionContext

◆ session_preload_libraries_string

◆ SessionUserId

◆ SessionUserIsSuperuser

◆ SetRoleIsActive

◆ shared_preload_libraries_string

◆ shmem_request_hook