#include "postgres.h"
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include "access/genam.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/session.h"
#include "access/tableam.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "access/xloginsert.h"
#include "catalog/namespace.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_database.h"
#include "catalog/pg_db_role_setting.h"
#include "catalog/pg_tablespace.h"
#include "libpq/auth.h"
#include "libpq/libpq-be.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/postmaster.h"
#include "replication/slot.h"
#include "replication/slotsync.h"
#include "replication/walsender.h"
#include "storage/aio_subsys.h"
#include "storage/bufmgr.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/lmgr.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "storage/procnumber.h"
#include "storage/procsignal.h"
#include "storage/sinvaladt.h"
#include "storage/smgr.h"
#include "storage/sync.h"
#include "tcop/backend_startup.h"
#include "tcop/tcopprot.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/guc_hooks.h"
#include "utils/injection_point.h"
#include "utils/memutils.h"
#include "utils/pg_locale.h"
#include "utils/portal.h"
#include "utils/ps_status.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "utils/timeout.h"

Include dependency graph for postinit.c:

Functions
static HeapTuple	GetDatabaseTuple (const char *dbname)

static HeapTuple	GetDatabaseTupleByOid (Oid dboid)

static void	PerformAuthentication (Port *port)

static void	CheckMyDatabase (const char *name, bool am_superuser, bool override_allow_connections)

static void	ShutdownPostgres (int code, Datum arg)

static void	StatementTimeoutHandler (void)

static void	LockTimeoutHandler (void)

static void	IdleInTransactionSessionTimeoutHandler (void)

static void	TransactionTimeoutHandler (void)

static void	IdleSessionTimeoutHandler (void)

static void	IdleStatsUpdateTimeoutHandler (void)

static void	ClientCheckTimeoutHandler (void)

static bool	ThereIsAtLeastOneRole (void)

static void	process_startup_options (Port *port, bool am_superuser)

static void	process_settings (Oid databaseid, Oid roleid)

void	pg_split_opts (char *argv, int argcp, const char *optstr)

void	InitializeMaxBackends (void)

void	InitializeFastPathLocks (void)

void	BaseInit (void)

void	InitPostgres (const char in_dbname, Oid dboid, const char username, Oid useroid, bits32 flags, char *out_dbname)

Function Documentation

◆ BaseInit()

void BaseInit ( void )

Definition at line 616 of file postinit.c.

{
    Assert(MyProc != NULL);
 
    /*
     * Initialize our input/output/debugging file descriptors.
     */
    DebugFileOpen();
 
    /*
     * Initialize file access. Done early so other subsystems can access
     * files.
     */
    InitFileAccess();
 
    /*
     * Initialize statistics reporting. This needs to happen early to ensure
     * that pgstat's shutdown callback runs after the shutdown callbacks of
     * all subsystems that can produce stats (like e.g. transaction commits
     * can).
     */
    pgstat_initialize();
 
    /*
     * Initialize AIO before infrastructure that might need to actually
     * execute AIO.
     */
    pgaio_init_backend();
 
    /* Do local initialization of storage and buffer managers */
    InitSync();
    smgrinit();
    InitBufferManagerAccess();
 
    /*
     * Initialize temporary file access after pgstat, so that the temporary
     * file shutdown hook can report temporary file statistics.
     */
    InitTemporaryFileAccess();
 
    /*
     * Initialize local buffers for WAL record construction, in case we ever
     * try to insert XLOG.
     */
    InitXLogInsert();
 
    /* Initialize lock manager's local structs */
    InitLockManagerAccess();
 
    /*
     * Initialize replication slots after pgstat. The exit hook might need to
     * drop ephemeral slots, which in turn triggers stats reporting.
     */
    ReplicationSlotInitialize();
 
    /*
     * The before shmem exit callback frees the DSA memory occupied by the
     * latest memory context statistics that could be published by this proc
     * if requested.
     */
    before_shmem_exit(AtProcExit_memstats_cleanup, 0);
}

References Assert(), AtProcExit_memstats_cleanup(), before_shmem_exit(), DebugFileOpen(), InitBufferManagerAccess(), InitFileAccess(), InitLockManagerAccess(), InitSync(), InitTemporaryFileAccess(), InitXLogInsert(), MyProc, pgaio_init_backend(), pgstat_initialize(), ReplicationSlotInitialize(), and smgrinit().

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), AuxiliaryProcessMainCommon(), BackgroundWorkerMain(), BootstrapModeMain(), PostgresMain(), and ReplSlotSyncWorkerMain().

◆ CheckMyDatabase()

static void CheckMyDatabase	(	const char *	name,
		bool	am_superuser,
		bool	override_allow_connections
	)

static

Definition at line 323 of file postinit.c.

{
    HeapTuple   tup;
    Form_pg_database dbform;
    Datum       datum;
    bool        isnull;
    char       *collate;
    char       *ctype;
 
    /* Fetch our pg_database row normally, via syscache */
    tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
    if (!HeapTupleIsValid(tup))
        elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
    dbform = (Form_pg_database) GETSTRUCT(tup);
 
    /* This recheck is strictly paranoia */
    if (strcmp(name, NameStr(dbform->datname)) != 0)
        ereport(FATAL,
                (errcode(ERRCODE_UNDEFINED_DATABASE),
                 errmsg("database \"%s\" has disappeared from pg_database",
                        name),
                 errdetail("Database OID %u now seems to belong to \"%s\".",
                           MyDatabaseId, NameStr(dbform->datname))));
 
    /*
     * Check permissions to connect to the database.
     *
     * These checks are not enforced when in standalone mode, so that there is
     * a way to recover from disabling all access to all databases, for
     * example "UPDATE pg_database SET datallowconn = false;".
     */
    if (IsUnderPostmaster)
    {
        /*
         * Check that the database is currently allowing connections.
         * (Background processes can override this test and the next one by
         * setting override_allow_connections.)
         */
        if (!dbform->datallowconn && !override_allow_connections)
            ereport(FATAL,
                    (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                     errmsg("database \"%s\" is not currently accepting connections",
                            name)));
 
        /*
         * Check privilege to connect to the database.  (The am_superuser test
         * is redundant, but since we have the flag, might as well check it
         * and save a few cycles.)
         */
        if (!am_superuser && !override_allow_connections &&
            object_aclcheck(DatabaseRelationId, MyDatabaseId, GetUserId(),
                            ACL_CONNECT) != ACLCHECK_OK)
            ereport(FATAL,
                    (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                     errmsg("permission denied for database \"%s\"", name),
                     errdetail("User does not have CONNECT privilege.")));
 
        /*
         * Check connection limit for this database.  We enforce the limit
         * only for regular backends, since other process types have their own
         * PGPROC pools.
         *
         * 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 (dbform->datconnlimit >= 0 &&
            AmRegularBackendProcess() &&
            !am_superuser &&
            CountDBConnections(MyDatabaseId) > dbform->datconnlimit)
            ereport(FATAL,
                    (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
                     errmsg("too many connections for database \"%s\"",
                            name)));
    }
 
    /*
     * OK, we're golden.  Next to-do item is to save the encoding info out of
     * the pg_database tuple.
     */
    SetDatabaseEncoding(dbform->encoding);
    /* Record it as a GUC internal option, too */
    SetConfigOption("server_encoding", GetDatabaseEncodingName(),
                    PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
    /* If we have no other source of client_encoding, use server encoding */
    SetConfigOption("client_encoding", GetDatabaseEncodingName(),
                    PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
 
    /* assign locale variables */
    datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
    collate = TextDatumGetCString(datum);
    datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
    ctype = TextDatumGetCString(datum);
 
    if (pg_perm_setlocale(LC_COLLATE, collate) == NULL)
        ereport(FATAL,
                (errmsg("database locale is incompatible with operating system"),
                 errdetail("The database was initialized with LC_COLLATE \"%s\", "
                           " which is not recognized by setlocale().", collate),
                 errhint("Recreate the database with another locale or install the missing locale.")));
 
    if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
        ereport(FATAL,
                (errmsg("database locale is incompatible with operating system"),
                 errdetail("The database was initialized with LC_CTYPE \"%s\", "
                           " which is not recognized by setlocale().", ctype),
                 errhint("Recreate the database with another locale or install the missing locale.")));
 
    if (strcmp(ctype, "C") == 0 ||
        strcmp(ctype, "POSIX") == 0)
        database_ctype_is_c = true;
 
    init_database_collation();
 
    /*
     * Check collation version.  See similar code in
     * pg_newlocale_from_collation().  Note that here we warn instead of error
     * in any case, so that we don't prevent connecting.
     */
    datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
                            &isnull);
    if (!isnull)
    {
        char       *actual_versionstr;
        char       *collversionstr;
        char       *locale;
 
        collversionstr = TextDatumGetCString(datum);
 
        if (dbform->datlocprovider == COLLPROVIDER_LIBC)
            locale = collate;
        else
        {
            datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
            locale = TextDatumGetCString(datum);
        }
 
        actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
        if (!actual_versionstr)
            /* should not happen */
            elog(WARNING,
                 "database \"%s\" has no actual collation version, but a version was recorded",
                 name);
        else if (strcmp(actual_versionstr, collversionstr) != 0)
            ereport(WARNING,
                    (errmsg("database \"%s\" has a collation version mismatch",
                            name),
                     errdetail("The database was created using collation version %s, "
                               "but the operating system provides version %s.",
                               collversionstr, actual_versionstr),
                     errhint("Rebuild all objects in this database that use the default collation and run "
                             "ALTER DATABASE %s REFRESH COLLATION VERSION, "
                             "or build PostgreSQL with the right library version.",
                             quote_identifier(name))));
    }
 
    ReleaseSysCache(tup);
}

References ACL_CONNECT, ACLCHECK_OK, AmRegularBackendProcess, CountDBConnections(), database_ctype_is_c, elog, ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, FATAL, get_collation_actual_version(), GetDatabaseEncodingName(), GETSTRUCT(), GetUserId(), HeapTupleIsValid, init_database_collation(), IsUnderPostmaster, locale, MyDatabaseId, name, NameStr, object_aclcheck(), ObjectIdGetDatum(), pg_perm_setlocale(), PGC_BACKEND, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT, quote_identifier(), ReleaseSysCache(), SearchSysCache1(), SetConfigOption(), SetDatabaseEncoding(), SysCacheGetAttr(), SysCacheGetAttrNotNull(), TextDatumGetCString, and WARNING.

Referenced by InitPostgres().

◆ ClientCheckTimeoutHandler()

static void ClientCheckTimeoutHandler ( void )

static

Definition at line 1435 of file postinit.c.

{
    CheckClientConnectionPending = true;
    InterruptPending = true;
    SetLatch(MyLatch);
}

References CheckClientConnectionPending, InterruptPending, MyLatch, and SetLatch().

Referenced by InitPostgres().

◆ GetDatabaseTuple()

static HeapTuple GetDatabaseTuple ( const char * dbname )

static

Definition at line 105 of file postinit.c.

{
    HeapTuple   tuple;
    Relation    relation;
    SysScanDesc scan;
    ScanKeyData key[1];
 
    /*
     * form a scan key
     */
    ScanKeyInit(&key[0],
                Anum_pg_database_datname,
                BTEqualStrategyNumber, F_NAMEEQ,
                CStringGetDatum(dbname));
 
    /*
     * Open pg_database and fetch a tuple.  Force heap scan if we haven't yet
     * built the critical shared relcache entries (i.e., we're starting up
     * without a shared relcache cache file).
     */
    relation = table_open(DatabaseRelationId, AccessShareLock);
    scan = systable_beginscan(relation, DatabaseNameIndexId,
                              criticalSharedRelcachesBuilt,
                              NULL,
                              1, key);
 
    tuple = systable_getnext(scan);
 
    /* Must copy tuple before releasing buffer */
    if (HeapTupleIsValid(tuple))
        tuple = heap_copytuple(tuple);
 
    /* all done */
    systable_endscan(scan);
    table_close(relation, AccessShareLock);
 
    return tuple;
}

References AccessShareLock, BTEqualStrategyNumber, criticalSharedRelcachesBuilt, CStringGetDatum(), dbname, heap_copytuple(), HeapTupleIsValid, sort-test::key, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by InitPostgres().

◆ GetDatabaseTupleByOid()

static HeapTuple GetDatabaseTupleByOid ( Oid dboid )

static

Definition at line 148 of file postinit.c.

{
    HeapTuple   tuple;
    Relation    relation;
    SysScanDesc scan;
    ScanKeyData key[1];
 
    /*
     * form a scan key
     */
    ScanKeyInit(&key[0],
                Anum_pg_database_oid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(dboid));
 
    /*
     * Open pg_database and fetch a tuple.  Force heap scan if we haven't yet
     * built the critical shared relcache entries (i.e., we're starting up
     * without a shared relcache cache file).
     */
    relation = table_open(DatabaseRelationId, AccessShareLock);
    scan = systable_beginscan(relation, DatabaseOidIndexId,
                              criticalSharedRelcachesBuilt,
                              NULL,
                              1, key);
 
    tuple = systable_getnext(scan);
 
    /* Must copy tuple before releasing buffer */
    if (HeapTupleIsValid(tuple))
        tuple = heap_copytuple(tuple);
 
    /* all done */
    systable_endscan(scan);
    table_close(relation, AccessShareLock);
 
    return tuple;
}

References AccessShareLock, BTEqualStrategyNumber, criticalSharedRelcachesBuilt, heap_copytuple(), HeapTupleIsValid, sort-test::key, ObjectIdGetDatum(), ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by InitPostgres().

◆ IdleInTransactionSessionTimeoutHandler()

static void IdleInTransactionSessionTimeoutHandler ( void )

static

Definition at line 1411 of file postinit.c.

{
    IdleInTransactionSessionTimeoutPending = true;
    InterruptPending = true;
    SetLatch(MyLatch);
}

References IdleInTransactionSessionTimeoutPending, InterruptPending, MyLatch, and SetLatch().

Referenced by InitPostgres().

◆ IdleSessionTimeoutHandler()

static void IdleSessionTimeoutHandler ( void )

static

Definition at line 1419 of file postinit.c.

{
    IdleSessionTimeoutPending = true;
    InterruptPending = true;
    SetLatch(MyLatch);
}

References IdleSessionTimeoutPending, InterruptPending, MyLatch, and SetLatch().

Referenced by InitPostgres().

◆ IdleStatsUpdateTimeoutHandler()

static void IdleStatsUpdateTimeoutHandler ( void )

static

Definition at line 1427 of file postinit.c.

{
    IdleStatsUpdateTimeoutPending = true;
    InterruptPending = true;
    SetLatch(MyLatch);
}

References IdleStatsUpdateTimeoutPending, InterruptPending, MyLatch, and SetLatch().

Referenced by InitPostgres().

◆ InitializeFastPathLocks()

void InitializeFastPathLocks ( void )

Definition at line 587 of file postinit.c.

{
    /* Should be initialized only once. */
    Assert(FastPathLockGroupsPerBackend == 0);
 
    /* we need at least one group */
    FastPathLockGroupsPerBackend = 1;
 
    while (FastPathLockGroupsPerBackend < FP_LOCK_GROUPS_PER_BACKEND_MAX)
    {
        /* stop once we exceed max_locks_per_xact */
        if (FastPathLockSlotsPerBackend() >= max_locks_per_xact)
            break;
 
        FastPathLockGroupsPerBackend *= 2;
    }
 
    Assert(FastPathLockGroupsPerBackend <= FP_LOCK_GROUPS_PER_BACKEND_MAX);
}

References Assert(), FastPathLockGroupsPerBackend, FastPathLockSlotsPerBackend, FP_LOCK_GROUPS_PER_BACKEND_MAX, and max_locks_per_xact.

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

◆ InitializeMaxBackends()

void InitializeMaxBackends ( void )

Definition at line 555 of file postinit.c.

{
    Assert(MaxBackends == 0);
 
    /* Note that this does not include "auxiliary" processes */
    MaxBackends = MaxConnections + autovacuum_worker_slots +
        max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
 
    if (MaxBackends > MAX_BACKENDS)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("too many server processes configured"),
                 errdetail("\"max_connections\" (%d) plus \"autovacuum_worker_slots\" (%d) plus \"max_worker_processes\" (%d) plus \"max_wal_senders\" (%d) must be less than %d.",
                           MaxConnections, autovacuum_worker_slots,
                           max_worker_processes, max_wal_senders,
                           MAX_BACKENDS - (NUM_SPECIAL_WORKER_PROCS - 1))));
}

References Assert(), autovacuum_worker_slots, ereport, errcode(), errdetail(), errmsg(), ERROR, MAX_BACKENDS, max_wal_senders, max_worker_processes, MaxBackends, MaxConnections, and NUM_SPECIAL_WORKER_PROCS.

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

◆ InitPostgres()

void InitPostgres	(	const char *	in_dbname,
		Oid	dboid,
		const char *	username,
		Oid	useroid,
		bits32	flags,
		char *	out_dbname
	)

Definition at line 723 of file postinit.c.

{
    bool        bootstrap = IsBootstrapProcessingMode();
    bool        am_superuser;
    char       *fullpath;
    char        dbname[NAMEDATALEN];
    int         nfree = 0;
 
    elog(DEBUG3, "InitPostgres");
 
    /*
     * Add my PGPROC struct to the ProcArray.
     *
     * Once I have done this, I am visible to other backends!
     */
    InitProcessPhase2();
 
    /* Initialize status reporting */
    pgstat_beinit();
 
    /*
     * And initialize an entry in the PgBackendStatus array.  That way, if
     * LWLocks or third-party authentication should happen to hang, it is
     * possible to retrieve some information about what is going on.
     */
    if (!bootstrap)
    {
        pgstat_bestart_initial();
        INJECTION_POINT("init-pre-auth");
    }
 
    /*
     * Initialize my entry in the shared-invalidation manager's array of
     * per-backend data.
     */
    SharedInvalBackendInit(false);
 
    ProcSignalInit(MyCancelKey, MyCancelKeyLength);
 
    /*
     * Also set up timeout handlers needed for backend operation.  We need
     * these in every case except bootstrap.
     */
    if (!bootstrap)
    {
        RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
        RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
        RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
        RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
                        IdleInTransactionSessionTimeoutHandler);
        RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
        RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
        RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
        RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
                        IdleStatsUpdateTimeoutHandler);
    }
 
    /*
     * If this is either a bootstrap process or a standalone backend, start up
     * the XLOG machinery, and register to have it closed down at exit. In
     * other cases, the startup process is responsible for starting up the
     * XLOG machinery, and the checkpointer for closing it down.
     */
    if (!IsUnderPostmaster)
    {
        /*
         * We don't yet have an aux-process resource owner, but StartupXLOG
         * and ShutdownXLOG will need one.  Hence, create said resource owner
         * (and register a callback to clean it up after ShutdownXLOG runs).
         */
        CreateAuxProcessResourceOwner();
 
        StartupXLOG();
        /* Release (and warn about) any buffer pins leaked in StartupXLOG */
        ReleaseAuxProcessResources(true);
        /* Reset CurrentResourceOwner to nothing for the moment */
        CurrentResourceOwner = NULL;
 
        /*
         * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
         * segments etc to work (which in turn is required for pgstats).
         */
        before_shmem_exit(pgstat_before_server_shutdown, 0);
        before_shmem_exit(ShutdownXLOG, 0);
    }
 
    /*
     * Initialize the relation cache and the system catalog caches.  Note that
     * no catalog access happens here; we only set up the hashtable structure.
     * We must do this before starting a transaction because transaction abort
     * would try to touch these hashtables.
     */
    RelationCacheInitialize();
    InitCatalogCache();
    InitPlanCache();
 
    /* Initialize portal manager */
    EnablePortalManager();
 
    /*
     * Load relcache entries for the shared system catalogs.  This must create
     * at least entries for pg_database and catalogs used for authentication.
     */
    RelationCacheInitializePhase2();
 
    /*
     * Set up process-exit callback to do pre-shutdown cleanup.  This is the
     * one of the first before_shmem_exit callbacks we register; thus, this
     * will be one the last things we do before low-level modules like the
     * buffer manager begin to close down.  We need to have this in place
     * before we begin our first transaction --- if we fail during the
     * initialization transaction, as is entirely possible, we need the
     * AbortTransaction call to clean up.
     */
    before_shmem_exit(ShutdownPostgres, 0);
 
    /* The autovacuum launcher is done here */
    if (AmAutoVacuumLauncherProcess())
    {
        /* fill in the remainder of this entry in the PgBackendStatus array */
        pgstat_bestart_final();
 
        return;
    }
 
    /*
     * Start a new transaction here before first access to db.
     */
    if (!bootstrap)
    {
        /* statement_timestamp must be set for timeouts to work correctly */
        SetCurrentStatementStartTimestamp();
        StartTransactionCommand();
 
        /*
         * transaction_isolation will have been set to the default by the
         * above.  If the default is "serializable", and we are in hot
         * standby, we will fail if we don't change it to something lower.
         * Fortunately, "read committed" is plenty good enough.
         */
        XactIsoLevel = XACT_READ_COMMITTED;
    }
 
    /*
     * Perform client authentication if necessary, then figure out our
     * postgres user ID, and see if we are a superuser.
     *
     * In standalone mode, autovacuum worker processes and slot sync worker
     * process, we use a fixed ID, otherwise we figure it out from the
     * authenticated user name.
     */
    if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
    {
        InitializeSessionUserIdStandalone();
        am_superuser = true;
    }
    else if (!IsUnderPostmaster)
    {
        InitializeSessionUserIdStandalone();
        am_superuser = true;
        if (!ThereIsAtLeastOneRole())
            ereport(WARNING,
                    (errcode(ERRCODE_UNDEFINED_OBJECT),
                     errmsg("no roles are defined in this database system"),
                     errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
                             username != NULL ? username : "postgres")));
    }
    else if (AmBackgroundWorkerProcess())
    {
        if (username == NULL && !OidIsValid(useroid))
        {
            InitializeSessionUserIdStandalone();
            am_superuser = true;
        }
        else
        {
            InitializeSessionUserId(username, useroid,
                                    (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
            am_superuser = superuser();
        }
    }
    else
    {
        /* normal multiuser case */
        Assert(MyProcPort != NULL);
        PerformAuthentication(MyProcPort);
        InitializeSessionUserId(username, useroid, false);
        /* ensure that auth_method is actually valid, aka authn_id is not NULL */
        if (MyClientConnectionInfo.authn_id)
            InitializeSystemUser(MyClientConnectionInfo.authn_id,
                                 hba_authname(MyClientConnectionInfo.auth_method));
        am_superuser = superuser();
    }
 
    /* Report any SSL/GSS details for the session. */
    if (MyProcPort != NULL)
    {
        Assert(!bootstrap);
 
        pgstat_bestart_security();
    }
 
    /*
     * Binary upgrades only allowed super-user connections
     */
    if (IsBinaryUpgrade && !am_superuser)
    {
        ereport(FATAL,
                (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                 errmsg("must be superuser to connect in binary upgrade mode")));
    }
 
    /*
     * The last few regular connection slots are reserved for superusers and
     * roles with privileges of pg_use_reserved_connections.  We do not apply
     * these limits to background processes, since they all have their own
     * pools of PGPROC slots.
     *
     * Note: At this point, the new backend has already claimed a proc struct,
     * so we must check whether the number of free slots is strictly less than
     * the reserved connection limits.
     */
    if (AmRegularBackendProcess() && !am_superuser &&
        (SuperuserReservedConnections + ReservedConnections) > 0 &&
        !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
    {
        if (nfree < SuperuserReservedConnections)
            ereport(FATAL,
                    (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
                     errmsg("remaining connection slots are reserved for roles with the %s attribute",
                            "SUPERUSER")));
 
        if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
            ereport(FATAL,
                    (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
                     errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
                            "pg_use_reserved_connections")));
    }
 
    /* Check replication permissions needed for walsender processes. */
    if (am_walsender)
    {
        Assert(!bootstrap);
 
        if (!has_rolreplication(GetUserId()))
            ereport(FATAL,
                    (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                     errmsg("permission denied to start WAL sender"),
                     errdetail("Only roles with the %s attribute may start a WAL sender process.",
                               "REPLICATION")));
    }
 
    /*
     * If this is a plain walsender only supporting physical replication, we
     * don't want to connect to any particular database. Just finish the
     * backend startup by processing any options from the startup packet, and
     * we're done.
     */
    if (am_walsender && !am_db_walsender)
    {
        /* process any options passed in the startup packet */
        if (MyProcPort != NULL)
            process_startup_options(MyProcPort, am_superuser);
 
        /* Apply PostAuthDelay as soon as we've read all options */
        if (PostAuthDelay > 0)
            pg_usleep(PostAuthDelay * 1000000L);
 
        /* initialize client encoding */
        InitializeClientEncoding();
 
        /* fill in the remainder of this entry in the PgBackendStatus array */
        pgstat_bestart_final();
 
        /* close the transaction we started above */
        CommitTransactionCommand();
 
        return;
    }
 
    /*
     * Set up the global variables holding database id and default tablespace.
     * But note we won't actually try to touch the database just yet.
     *
     * We take a shortcut in the bootstrap case, otherwise we have to look up
     * the db's entry in pg_database.
     */
    if (bootstrap)
    {
        dboid = Template1DbOid;
        MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
    }
    else if (in_dbname != NULL)
    {
        HeapTuple   tuple;
        Form_pg_database dbform;
 
        tuple = GetDatabaseTuple(in_dbname);
        if (!HeapTupleIsValid(tuple))
            ereport(FATAL,
                    (errcode(ERRCODE_UNDEFINED_DATABASE),
                     errmsg("database \"%s\" does not exist", in_dbname)));
        dbform = (Form_pg_database) GETSTRUCT(tuple);
        dboid = dbform->oid;
    }
    else if (!OidIsValid(dboid))
    {
        /*
         * If this is a background worker not bound to any particular
         * database, we're done now.  Everything that follows only makes sense
         * if we are bound to a specific database.  We do need to close the
         * transaction we started before returning.
         */
        if (!bootstrap)
        {
            pgstat_bestart_final();
            CommitTransactionCommand();
        }
        return;
    }
 
    /*
     * Now, take a writer's lock on the database we are trying to connect to.
     * If there is a concurrently running DROP DATABASE on that database, this
     * will block us until it finishes (and has committed its update of
     * pg_database).
     *
     * Note that the lock is not held long, only until the end of this startup
     * transaction.  This is OK since we will advertise our use of the
     * database in the ProcArray before dropping the lock (in fact, that's the
     * next thing to do).  Anyone trying a DROP DATABASE after this point will
     * see us in the array once they have the lock.  Ordering is important for
     * this because we don't want to advertise ourselves as being in this
     * database until we have the lock; otherwise we create what amounts to a
     * deadlock with CountOtherDBBackends().
     *
     * Note: use of RowExclusiveLock here is reasonable because we envision
     * our session as being a concurrent writer of the database.  If we had a
     * way of declaring a session as being guaranteed-read-only, we could use
     * AccessShareLock for such sessions and thereby not conflict against
     * CREATE DATABASE.
     */
    if (!bootstrap)
        LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
 
    /*
     * Recheck pg_database to make sure the target database hasn't gone away.
     * If there was a concurrent DROP DATABASE, this ensures we will die
     * cleanly without creating a mess.
     */
    if (!bootstrap)
    {
        HeapTuple   tuple;
        Form_pg_database datform;
 
        tuple = GetDatabaseTupleByOid(dboid);
        if (HeapTupleIsValid(tuple))
            datform = (Form_pg_database) GETSTRUCT(tuple);
 
        if (!HeapTupleIsValid(tuple) ||
            (in_dbname && namestrcmp(&datform->datname, in_dbname)))
        {
            if (in_dbname)
                ereport(FATAL,
                        (errcode(ERRCODE_UNDEFINED_DATABASE),
                         errmsg("database \"%s\" does not exist", in_dbname),
                         errdetail("It seems to have just been dropped or renamed.")));
            else
                ereport(FATAL,
                        (errcode(ERRCODE_UNDEFINED_DATABASE),
                         errmsg("database %u does not exist", dboid)));
        }
 
        strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
 
        if (database_is_invalid_form(datform))
        {
            ereport(FATAL,
                    errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                    errmsg("cannot connect to invalid database \"%s\"", dbname),
                    errhint("Use DROP DATABASE to drop invalid databases."));
        }
 
        MyDatabaseTableSpace = datform->dattablespace;
        MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
        /* pass the database name back to the caller */
        if (out_dbname)
            strcpy(out_dbname, dbname);
    }
 
    /*
     * Now that we rechecked, we are certain to be connected to a database and
     * thus can set MyDatabaseId.
     *
     * It is important that MyDatabaseId only be set once we are sure that the
     * target database can no longer be concurrently dropped or renamed.  For
     * example, without this guarantee, pgstat_update_dbstats() could create
     * entries for databases that were just dropped in the pgstat shutdown
     * callback, which could confuse other code paths like the autovacuum
     * scheduler.
     */
    MyDatabaseId = dboid;
 
    /*
     * Now we can mark our PGPROC entry with the database ID.
     *
     * We assume this is an atomic store so no lock is needed; though actually
     * things would work fine even if it weren't atomic.  Anyone searching the
     * ProcArray for this database's ID should hold the database lock, so they
     * would not be executing concurrently with this store.  A process looking
     * for another database's ID could in theory see a chance match if it read
     * a partially-updated databaseId value; but as long as all such searches
     * wait and retry, as in CountOtherDBBackends(), they will certainly see
     * the correct value on their next try.
     */
    MyProc->databaseId = MyDatabaseId;
 
    /*
     * We established a catalog snapshot while reading pg_authid and/or
     * pg_database; but until we have set up MyDatabaseId, we won't react to
     * incoming sinval messages for unshared catalogs, so we won't realize it
     * if the snapshot has been invalidated.  Assume it's no good anymore.
     */
    InvalidateCatalogSnapshot();
 
    /*
     * Now we should be able to access the database directory safely. Verify
     * it's there and looks reasonable.
     */
    fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
 
    if (!bootstrap)
    {
        if (access(fullpath, F_OK) == -1)
        {
            if (errno == ENOENT)
                ereport(FATAL,
                        (errcode(ERRCODE_UNDEFINED_DATABASE),
                         errmsg("database \"%s\" does not exist",
                                dbname),
                         errdetail("The database subdirectory \"%s\" is missing.",
                                   fullpath)));
            else
                ereport(FATAL,
                        (errcode_for_file_access(),
                         errmsg("could not access directory \"%s\": %m",
                                fullpath)));
        }
 
        ValidatePgVersion(fullpath);
    }
 
    SetDatabasePath(fullpath);
    pfree(fullpath);
 
    /*
     * It's now possible to do real access to the system catalogs.
     *
     * Load relcache entries for the system catalogs.  This must create at
     * least the minimum set of "nailed-in" cache entries.
     */
    RelationCacheInitializePhase3();
 
    /* set up ACL framework (so CheckMyDatabase can check permissions) */
    initialize_acl();
 
    /*
     * Re-read the pg_database row for our database, check permissions and set
     * up database-specific GUC settings.  We can't do this until all the
     * database-access infrastructure is up.  (Also, it wants to know if the
     * user is a superuser, so the above stuff has to happen first.)
     */
    if (!bootstrap)
        CheckMyDatabase(dbname, am_superuser,
                        (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
 
    /*
     * Now process any command-line switches and any additional GUC variable
     * settings passed in the startup packet.   We couldn't do this before
     * because we didn't know if client is a superuser.
     */
    if (MyProcPort != NULL)
        process_startup_options(MyProcPort, am_superuser);
 
    /* Process pg_db_role_setting options */
    process_settings(MyDatabaseId, GetSessionUserId());
 
    /* Apply PostAuthDelay as soon as we've read all options */
    if (PostAuthDelay > 0)
        pg_usleep(PostAuthDelay * 1000000L);
 
    /*
     * Initialize various default states that can't be set up until we've
     * selected the active user and gotten the right GUC settings.
     */
 
    /* set default namespace search path */
    InitializeSearchPath();
 
    /* initialize client encoding */
    InitializeClientEncoding();
 
    /* Initialize this backend's session state. */
    InitializeSession();
 
    /*
     * If this is an interactive session, load any libraries that should be
     * preloaded at backend start.  Since those are determined by GUCs, this
     * can't happen until GUC settings are complete, but we want it to happen
     * during the initial transaction in case anything that requires database
     * access needs to be done.
     */
    if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
        process_session_preload_libraries();
 
    /* fill in the remainder of this entry in the PgBackendStatus array */
    if (!bootstrap)
        pgstat_bestart_final();
 
    /* close the transaction we started above */
    if (!bootstrap)
        CommitTransactionCommand();
}

References am_db_walsender, am_walsender, AmAutoVacuumLauncherProcess, AmAutoVacuumWorkerProcess, AmBackgroundWorkerProcess, AmLogicalSlotSyncWorkerProcess, AmRegularBackendProcess, Assert(), ClientConnectionInfo::auth_method, ClientConnectionInfo::authn_id, before_shmem_exit(), CheckDeadLockAlert(), CheckMyDatabase(), CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler(), CommitTransactionCommand(), CreateAuxProcessResourceOwner(), CurrentResourceOwner, database_is_invalid_form(), PGPROC::databaseId, dbname, DEADLOCK_TIMEOUT, DEBUG3, elog, EnablePortalManager(), ereport, errcode(), errcode_for_file_access(), errdetail(), errhint(), errmsg(), FATAL, GetDatabasePath(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetSessionUserId(), GETSTRUCT(), GetUserId(), has_privs_of_role(), has_rolreplication(), HaveNFreeProcs(), hba_authname(), HeapTupleIsValid, IDLE_IN_TRANSACTION_SESSION_TIMEOUT, IDLE_SESSION_TIMEOUT, IDLE_STATS_UPDATE_TIMEOUT, IdleInTransactionSessionTimeoutHandler(), IdleSessionTimeoutHandler(), IdleStatsUpdateTimeoutHandler(), INIT_PG_LOAD_SESSION_LIBS, INIT_PG_OVERRIDE_ALLOW_CONNS, INIT_PG_OVERRIDE_ROLE_LOGIN, InitCatalogCache(), initialize_acl(), InitializeClientEncoding(), InitializeSearchPath(), InitializeSession(), InitializeSessionUserId(), InitializeSessionUserIdStandalone(), InitializeSystemUser(), InitPlanCache(), InitProcessPhase2(), INJECTION_POINT, InvalidateCatalogSnapshot(), IsBinaryUpgrade, IsBootstrapProcessingMode, IsUnderPostmaster, LOCK_TIMEOUT, LockSharedObject(), LockTimeoutHandler(), MyCancelKey, MyCancelKeyLength, MyClientConnectionInfo, MyDatabaseHasLoginEventTriggers, MyDatabaseId, MyDatabaseTableSpace, MyProc, MyProcPort, NAMEDATALEN, NameStr, namestrcmp(), OidIsValid, PerformAuthentication(), pfree(), pg_usleep(), pgstat_before_server_shutdown(), pgstat_beinit(), pgstat_bestart_final(), pgstat_bestart_initial(), pgstat_bestart_security(), PostAuthDelay, process_session_preload_libraries(), process_settings(), process_startup_options(), ProcSignalInit(), RegisterTimeout(), RelationCacheInitialize(), RelationCacheInitializePhase2(), RelationCacheInitializePhase3(), ReleaseAuxProcessResources(), ReservedConnections, RowExclusiveLock, SetCurrentStatementStartTimestamp(), SetDatabasePath(), SharedInvalBackendInit(), ShutdownPostgres(), ShutdownXLOG(), StartTransactionCommand(), StartupXLOG(), STATEMENT_TIMEOUT, StatementTimeoutHandler(), strlcpy(), superuser(), SuperuserReservedConnections, ThereIsAtLeastOneRole(), TRANSACTION_TIMEOUT, TransactionTimeoutHandler(), username, ValidatePgVersion(), WARNING, XACT_READ_COMMITTED, and XactIsoLevel.

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), BackgroundWorkerInitializeConnection(), BackgroundWorkerInitializeConnectionByOid(), BootstrapModeMain(), PostgresMain(), and ReplSlotSyncWorkerMain().

◆ LockTimeoutHandler()

static void LockTimeoutHandler ( void )

static

Definition at line 1393 of file postinit.c.

{
#ifdef HAVE_SETSID
    /* try to signal whole process group */
    kill(-MyProcPid, SIGINT);
#endif
    kill(MyProcPid, SIGINT);
}

References kill, and MyProcPid.

Referenced by InitPostgres().

◆ PerformAuthentication()

static void PerformAuthentication ( Port * port )

static

Definition at line 194 of file postinit.c.

{
    /* This should be set already, but let's make sure */
    ClientAuthInProgress = true;    /* limit visibility of log messages */
 
    /*
     * In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
     * etcetera from the postmaster, and have to load them ourselves.
     *
     * FIXME: [fork/exec] Ugh.  Is there a way around this overhead?
     */
#ifdef EXEC_BACKEND
 
    /*
     * load_hba() and load_ident() want to work within the PostmasterContext,
     * so create that if it doesn't exist (which it won't).  We'll delete it
     * again later, in PostgresMain.
     */
    if (PostmasterContext == NULL)
        PostmasterContext = AllocSetContextCreate(TopMemoryContext,
                                                  "Postmaster",
                                                  ALLOCSET_DEFAULT_SIZES);
 
    if (!load_hba())
    {
        /*
         * It makes no sense to continue if we fail to load the HBA file,
         * since there is no way to connect to the database in this case.
         */
        ereport(FATAL,
        /* translator: %s is a configuration file */
                (errmsg("could not load %s", HbaFileName)));
    }
 
    if (!load_ident())
    {
        /*
         * It is ok to continue if we fail to load the IDENT file, although it
         * means that you cannot log in using any of the authentication
         * methods that need a user name mapping. load_ident() already logged
         * the details of error to the log.
         */
    }
#endif
 
    /* Capture authentication start time for logging */
    conn_timing.auth_start = GetCurrentTimestamp();
 
    /*
     * Set up a timeout in case a buggy or malicious client fails to respond
     * during authentication.  Since we're inside a transaction and might do
     * database access, we have to use the statement_timeout infrastructure.
     */
    enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
 
    /*
     * Now perform authentication exchange.
     */
    set_ps_display("authentication");
    ClientAuthentication(port); /* might not return, if failure */
 
    /*
     * Done with authentication.  Disable the timeout, and log if needed.
     */
    disable_timeout(STATEMENT_TIMEOUT, false);
 
    /* Capture authentication end time for logging */
    conn_timing.auth_end = GetCurrentTimestamp();
 
    if (log_connections & LOG_CONNECTION_AUTHORIZATION)
    {
        StringInfoData logmsg;
 
        initStringInfo(&logmsg);
        if (am_walsender)
            appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
                             port->user_name);
        else
            appendStringInfo(&logmsg, _("connection authorized: user=%s"),
                             port->user_name);
        if (!am_walsender)
            appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
 
        if (port->application_name != NULL)
            appendStringInfo(&logmsg, _(" application_name=%s"),
                             port->application_name);
 
#ifdef USE_SSL
        if (port->ssl_in_use)
            appendStringInfo(&logmsg, _(" SSL enabled (protocol=%s, cipher=%s, bits=%d)"),
                             be_tls_get_version(port),
                             be_tls_get_cipher(port),
                             be_tls_get_cipher_bits(port));
#endif
#ifdef ENABLE_GSS
        if (port->gss)
        {
            const char *princ = be_gssapi_get_princ(port);
 
            if (princ)
                appendStringInfo(&logmsg,
                                 _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s, principal=%s)"),
                                 be_gssapi_get_auth(port) ? _("yes") : _("no"),
                                 be_gssapi_get_enc(port) ? _("yes") : _("no"),
                                 be_gssapi_get_delegation(port) ? _("yes") : _("no"),
                                 princ);
            else
                appendStringInfo(&logmsg,
                                 _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s)"),
                                 be_gssapi_get_auth(port) ? _("yes") : _("no"),
                                 be_gssapi_get_enc(port) ? _("yes") : _("no"),
                                 be_gssapi_get_delegation(port) ? _("yes") : _("no"));
        }
#endif
 
        ereport(LOG, errmsg_internal("%s", logmsg.data));
        pfree(logmsg.data);
    }
 
    set_ps_display("startup");
 
    ClientAuthInProgress = false;   /* client_min_messages is active now */
}

References _, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, am_walsender, appendStringInfo(), ConnectionTiming::auth_end, ConnectionTiming::auth_start, AuthenticationTimeout, be_gssapi_get_auth(), be_gssapi_get_delegation(), be_gssapi_get_enc(), be_gssapi_get_princ(), be_tls_get_cipher(), be_tls_get_cipher_bits(), be_tls_get_version(), ClientAuthentication(), ClientAuthInProgress, conn_timing, StringInfoData::data, disable_timeout(), enable_timeout_after(), ereport, errmsg(), errmsg_internal(), FATAL, GetCurrentTimestamp(), HbaFileName, initStringInfo(), load_hba(), load_ident(), LOG, LOG_CONNECTION_AUTHORIZATION, log_connections, pfree(), port, PostmasterContext, set_ps_display(), STATEMENT_TIMEOUT, and TopMemoryContext.

Referenced by InitPostgres().

◆ pg_split_opts()

void pg_split_opts	(	char **	argv,
		int *	argcp,
		const char *	optstr
	)

Definition at line 497 of file postinit.c.

{
    StringInfoData s;
 
    initStringInfo(&s);
 
    while (*optstr)
    {
        bool        last_was_escape = false;
 
        resetStringInfo(&s);
 
        /* skip over leading space */
        while (isspace((unsigned char) *optstr))
            optstr++;
 
        if (*optstr == '\0')
            break;
 
        /*
         * Parse a single option, stopping at the first space, unless it's
         * escaped.
         */
        while (*optstr)
        {
            if (isspace((unsigned char) *optstr) && !last_was_escape)
                break;
 
            if (!last_was_escape && *optstr == '\\')
                last_was_escape = true;
            else
            {
                last_was_escape = false;
                appendStringInfoChar(&s, *optstr);
            }
 
            optstr++;
        }
 
        /* now store the option in the next argv[] position */
        argv[(*argcp)++] = pstrdup(s.data);
    }
 
    pfree(s.data);
}

References appendStringInfoChar(), StringInfoData::data, initStringInfo(), pfree(), pstrdup(), and resetStringInfo().

Referenced by process_startup_options().

◆ process_settings()

static void process_settings	(	Oid	databaseid,
		Oid	roleid
	)

static

Definition at line 1320 of file postinit.c.

{
    Relation    relsetting;
    Snapshot    snapshot;
 
    if (!IsUnderPostmaster)
        return;
 
    relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
 
    /* read all the settings under the same snapshot for efficiency */
    snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
 
    /* Later settings are ignored if set earlier. */
    ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
    ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
    ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
    ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
 
    UnregisterSnapshot(snapshot);
    table_close(relsetting, AccessShareLock);
}

References AccessShareLock, ApplySetting(), GetCatalogSnapshot(), InvalidOid, IsUnderPostmaster, PGC_S_DATABASE, PGC_S_DATABASE_USER, PGC_S_GLOBAL, PGC_S_USER, RegisterSnapshot(), table_close(), table_open(), and UnregisterSnapshot().

Referenced by InitPostgres().

◆ process_startup_options()

static void process_startup_options	(	Port *	port,
		bool	am_superuser
	)

static

Definition at line 1255 of file postinit.c.

{
    GucContext  gucctx;
    ListCell   *gucopts;
 
    gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
 
    /*
     * First process any command-line switches that were included in the
     * startup packet, if we are in a regular backend.
     */
    if (port->cmdline_options != NULL)
    {
        /*
         * The maximum possible number of commandline arguments that could
         * come from port->cmdline_options is (strlen + 1) / 2; see
         * pg_split_opts().
         */
        char      **av;
        int         maxac;
        int         ac;
 
        maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
 
        av = (char **) palloc(maxac * sizeof(char *));
        ac = 0;
 
        av[ac++] = "postgres";
 
        pg_split_opts(av, &ac, port->cmdline_options);
 
        av[ac] = NULL;
 
        Assert(ac < maxac);
 
        (void) process_postgres_switches(ac, av, gucctx, NULL);
    }
 
    /*
     * Process any additional GUC variable settings passed in startup packet.
     * These are handled exactly like command-line variables.
     */
    gucopts = list_head(port->guc_options);
    while (gucopts)
    {
        char       *name;
        char       *value;
 
        name = lfirst(gucopts);
        gucopts = lnext(port->guc_options, gucopts);
 
        value = lfirst(gucopts);
        gucopts = lnext(port->guc_options, gucopts);
 
        SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
    }
}

References Assert(), av, lfirst, list_head(), lnext(), name, palloc(), pg_split_opts(), PGC_BACKEND, PGC_S_CLIENT, PGC_SU_BACKEND, port, process_postgres_switches(), SetConfigOption(), and value.

Referenced by InitPostgres().

◆ ShutdownPostgres()

static void ShutdownPostgres	(	int	code,
		Datum	arg
	)

static

Definition at line 1354 of file postinit.c.

{
    /* Make sure we've killed any active transaction */
    AbortOutOfAnyTransaction();
 
    /*
     * User locks are not released by transaction end, so be sure to release
     * them explicitly.
     */
    LockReleaseAll(USER_LOCKMETHOD, true);
}

References AbortOutOfAnyTransaction(), LockReleaseAll(), and USER_LOCKMETHOD.

Referenced by InitPostgres().

◆ StatementTimeoutHandler()

static void StatementTimeoutHandler ( void )

static

Definition at line 1371 of file postinit.c.

{
    int         sig = SIGINT;
 
    /*
     * During authentication the timeout is used to deal with
     * authentication_timeout - we want to quit in response to such timeouts.
     */
    if (ClientAuthInProgress)
        sig = SIGTERM;
 
#ifdef HAVE_SETSID
    /* try to signal whole process group */
    kill(-MyProcPid, sig);
#endif
    kill(MyProcPid, sig);
}

References ClientAuthInProgress, kill, MyProcPid, and sig.

Referenced by InitPostgres().

◆ ThereIsAtLeastOneRole()

static bool ThereIsAtLeastOneRole ( void )

static

Definition at line 1446 of file postinit.c.

{
    Relation    pg_authid_rel;
    TableScanDesc scan;
    bool        result;
 
    pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
 
    scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
    result = (heap_getnext(scan, ForwardScanDirection) != NULL);
 
    table_endscan(scan);
    table_close(pg_authid_rel, AccessShareLock);
 
    return result;
}

References AccessShareLock, ForwardScanDirection, heap_getnext(), table_beginscan_catalog(), table_close(), table_endscan(), and table_open().

Referenced by InitPostgres().

◆ TransactionTimeoutHandler()

static void TransactionTimeoutHandler ( void )

static

Definition at line 1403 of file postinit.c.

{
    TransactionTimeoutPending = true;
    InterruptPending = true;
    SetLatch(MyLatch);
}

References InterruptPending, MyLatch, SetLatch(), and TransactionTimeoutPending.

Referenced by InitPostgres().

Functions

Function Documentation

◆ BaseInit()

◆ CheckMyDatabase()

◆ ClientCheckTimeoutHandler()

◆ GetDatabaseTuple()

◆ GetDatabaseTupleByOid()

◆ IdleInTransactionSessionTimeoutHandler()

◆ IdleSessionTimeoutHandler()

◆ IdleStatsUpdateTimeoutHandler()

◆ InitializeFastPathLocks()

◆ InitializeMaxBackends()

◆ InitPostgres()

◆ LockTimeoutHandler()

◆ PerformAuthentication()

◆ pg_split_opts()

◆ process_settings()

◆ process_startup_options()

◆ ShutdownPostgres()

◆ StatementTimeoutHandler()

◆ ThereIsAtLeastOneRole()

◆ TransactionTimeoutHandler()