postinit.c File Reference

#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/sysattr.h"
#include "access/tableam.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "access/xloginsert.h"
#include "catalog/catalog.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/walsender.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/procsignal.h"
#include "storage/sinvaladt.h"
#include "storage/smgr.h"
#include "storage/sync.h"
#include "tcop/tcopprot.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/guc_hooks.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:

Go to the source code of this file.

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	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)
bool	check_max_connections (int *newval, void **extra, GucSource source)
bool	check_autovacuum_max_workers (int *newval, void **extra, GucSource source)
bool	check_max_worker_processes (int *newval, void **extra, GucSource source)
bool	check_max_wal_senders (int *newval, void **extra, GucSource source)
void	BaseInit (void)
void	InitPostgres (const char *in_dbname, Oid dboid, const char *username, Oid useroid, bool load_session_libraries, bool override_allow_connections, char *out_dbname)

Function Documentation

BaseInit()

void BaseInit

(

void

)

Definition at line 633 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();
 
    /* Do local initialization of storage and buffer managers */
    InitSync();
    smgrinit();
    InitBufferPoolAccess();
 
    /*
     * 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 replication slots after pgstat. The exit hook might need to
     * drop ephemeral slots, which in turn triggers stats reporting.
     */
    ReplicationSlotInitialize();
}

References Assert(), DebugFileOpen(), InitBufferPoolAccess(), InitFileAccess(), InitSync(), InitTemporaryFileAccess(), InitXLogInsert(), MyProc, pgstat_initialize(), ReplicationSlotInitialize(), and smgrinit().

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), AuxiliaryProcessMain(), BootstrapModeMain(), PostgresMain(), and StartBackgroundWorker().

check_autovacuum_max_workers()

bool check_autovacuum_max_workers	(	int *	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 592 of file postinit.c.

{
    if (MaxConnections + *newval + 1 +
        max_worker_processes + max_wal_senders > MAX_BACKENDS)
        return false;
    return true;
}

References MAX_BACKENDS, max_wal_senders, max_worker_processes, MaxConnections, and newval.

check_max_connections()

bool check_max_connections	(	int *	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 580 of file postinit.c.

{
    if (*newval + autovacuum_max_workers + 1 +
        max_worker_processes + max_wal_senders > MAX_BACKENDS)
        return false;
    return true;
}

References autovacuum_max_workers, MAX_BACKENDS, max_wal_senders, max_worker_processes, and newval.

check_max_wal_senders()

bool check_max_wal_senders	(	int *	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 616 of file postinit.c.

{
    if (MaxConnections + autovacuum_max_workers + 1 +
        max_worker_processes + *newval > MAX_BACKENDS)
        return false;
    return true;
}

References autovacuum_max_workers, MAX_BACKENDS, max_worker_processes, MaxConnections, and newval.

check_max_worker_processes()

bool check_max_worker_processes	(	int *	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 604 of file postinit.c.

{
    if (MaxConnections + autovacuum_max_workers + 1 +
        *newval + max_wal_senders > MAX_BACKENDS)
        return false;
    return true;
}

References autovacuum_max_workers, MAX_BACKENDS, max_wal_senders, MaxConnections, and newval.

CheckMyDatabase()

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

static

Definition at line 311 of file postinit.c.

{
    HeapTuple   tup;
    Form_pg_database dbform;
    Datum       datum;
    bool        isnull;
    char       *collate;
    char       *ctype;
    char       *iculocale;
 
    /* 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;".
     *
     * We do not enforce them for autovacuum worker processes either.
     */
    if (IsUnderPostmaster && !IsAutoVacuumWorkerProcess())
    {
        /*
         * Check that the database is currently allowing 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 &&
            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.
         *
         * 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 &&
            !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;
 
    if (dbform->datlocprovider == COLLPROVIDER_ICU)
    {
        char       *icurules;
 
        datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_daticulocale);
        iculocale = TextDatumGetCString(datum);
 
        datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_daticurules, &isnull);
        if (!isnull)
            icurules = TextDatumGetCString(datum);
        else
            icurules = NULL;
 
        make_icu_collator(iculocale, icurules, &default_locale);
    }
    else
        iculocale = NULL;
 
    default_locale.provider = dbform->datlocprovider;
 
    /*
     * Default locale is currently always deterministic.  Nondeterministic
     * locales currently don't support pattern matching, which would break a
     * lot of things if applied globally.
     */
    default_locale.deterministic = true;
 
    /*
     * 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;
 
        collversionstr = TextDatumGetCString(datum);
 
        actual_versionstr = get_collation_actual_version(dbform->datlocprovider, dbform->datlocprovider == COLLPROVIDER_ICU ? iculocale : collate);
        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))));
    }
 
    /* Make the locale settings visible as GUC variables, too */
    SetConfigOption("lc_collate", collate, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
    SetConfigOption("lc_ctype", ctype, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
 
    check_strxfrm_bug();
 
    ReleaseSysCache(tup);
}

References ACL_CONNECT, ACLCHECK_OK, check_strxfrm_bug(), CountDBConnections(), database_ctype_is_c, DATABASEOID, default_locale, pg_locale_struct::deterministic, elog(), ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, FATAL, get_collation_actual_version(), GetDatabaseEncodingName(), GETSTRUCT, GetUserId(), HeapTupleIsValid, IsAutoVacuumWorkerProcess(), IsUnderPostmaster, make_icu_collator(), MyDatabaseId, name, NameStr, object_aclcheck(), ObjectIdGetDatum(), pg_perm_setlocale(), PGC_BACKEND, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT, pg_locale_struct::provider, quote_identifier(), ReleaseSysCache(), SearchSysCache1(), SetConfigOption(), SetDatabaseEncoding(), SysCacheGetAttr(), SysCacheGetAttrNotNull(), TextDatumGetCString, and WARNING.

Referenced by InitPostgres().

ClientCheckTimeoutHandler()

static void ClientCheckTimeoutHandler ( void  )

static

Definition at line 1409 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 101 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 144 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 1385 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 1393 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 1401 of file postinit.c.

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

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

Referenced by InitPostgres().

InitializeMaxBackends()

void InitializeMaxBackends

(

void

)

Definition at line 563 of file postinit.c.

{
    Assert(MaxBackends == 0);
 
    /* the extra unit accounts for the autovacuum launcher */
    MaxBackends = MaxConnections + autovacuum_max_workers + 1 +
        max_worker_processes + max_wal_senders;
 
    /* internal error because the values were all checked previously */
    if (MaxBackends > MAX_BACKENDS)
        elog(ERROR, "too many backends configured");
}

References Assert(), autovacuum_max_workers, elog(), ERROR, MAX_BACKENDS, max_wal_senders, max_worker_processes, MaxBackends, and MaxConnections.

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

InitPostgres()

void InitPostgres	(	const char *	in_dbname,
		Oid	dboid,
		const char *	username,
		Oid	useroid,
		bool	load_session_libraries,
		bool	override_allow_connections,
		char *	out_dbname
	)

Definition at line 722 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 my entry in the shared-invalidation manager's array of
     * per-backend data.
     *
     * Sets up MyBackendId, a unique backend identifier.
     */
    MyBackendId = InvalidBackendId;
 
    SharedInvalBackendInit(false);
 
    if (MyBackendId > MaxBackends || MyBackendId <= 0)
        elog(FATAL, "bad backend ID: %d", MyBackendId);
 
    /* Now that we have a BackendId, we can participate in ProcSignal */
    ProcSignalInit(MyBackendId);
 
    /*
     * 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(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();
 
    /* Initialize status reporting */
    pgstat_beinit();
 
    /*
     * 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 (IsAutoVacuumLauncherProcess())
    {
        /* report this backend in the PgBackendStatus array */
        pgstat_bestart();
 
        return;
    }
 
    /*
     * Start a new transaction here before first access to db, and get a
     * snapshot.  We don't have a use for the snapshot itself, but we're
     * interested in the secondary effect that it sets RecentGlobalXmin. (This
     * is critical for anything that reads heap pages, because HOT may decide
     * to prune them even if the process doesn't attempt to modify any
     * tuples.)
     *
     * FIXME: This comment is inaccurate / the code buggy. A snapshot that is
     * not pushed/active does not reliably prevent HOT pruning (->xmin could
     * e.g. be cleared when cache invalidations are processed).
     */
    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;
 
        (void) GetTransactionSnapshot();
    }
 
    /*
     * Perform client authentication if necessary, then figure out our
     * postgres user ID, and see if we are a superuser.
     *
     * In standalone mode and in autovacuum worker processes, we use a fixed
     * ID, otherwise we figure it out from the authenticated user name.
     */
    if (bootstrap || IsAutoVacuumWorkerProcess())
    {
        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 (IsBackgroundWorker)
    {
        if (username == NULL && !OidIsValid(useroid))
        {
            InitializeSessionUserIdStandalone();
            am_superuser = true;
        }
        else
        {
            InitializeSessionUserId(username, useroid);
            am_superuser = superuser();
        }
    }
    else
    {
        /* normal multiuser case */
        Assert(MyProcPort != NULL);
        PerformAuthentication(MyProcPort);
        InitializeSessionUserId(username, useroid);
        /* 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();
    }
 
    /*
     * 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 connection slots are reserved for superusers and roles with
     * privileges of pg_use_reserved_connections.  Replication connections are
     * drawn from slots reserved with max_wal_senders and are not limited by
     * max_connections, superuser_reserved_connections, or
     * reserved_connections.
     *
     * 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 (!am_superuser && !am_walsender &&
        (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 %s",
                            "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();
 
        /* report this backend in the PgBackendStatus array */
        pgstat_bestart();
 
        /* 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)
    {
        MyDatabaseId = 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);
        MyDatabaseId = dbform->oid;
        MyDatabaseTableSpace = dbform->dattablespace;
        /* take database name from the caller, just for paranoia */
        strlcpy(dbname, in_dbname, sizeof(dbname));
    }
    else if (OidIsValid(dboid))
    {
        /* caller specified database by OID */
        HeapTuple   tuple;
        Form_pg_database dbform;
 
        tuple = GetDatabaseTupleByOid(dboid);
        if (!HeapTupleIsValid(tuple))
            ereport(FATAL,
                    (errcode(ERRCODE_UNDEFINED_DATABASE),
                     errmsg("database %u does not exist", dboid)));
        dbform = (Form_pg_database) GETSTRUCT(tuple);
        MyDatabaseId = dbform->oid;
        MyDatabaseTableSpace = dbform->dattablespace;
        Assert(MyDatabaseId == dboid);
        strlcpy(dbname, NameStr(dbform->datname), sizeof(dbname));
        /* pass the database name back to the caller */
        if (out_dbname)
            strcpy(out_dbname, dbname);
    }
    else
    {
        /*
         * 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();
            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, MyDatabaseId, 0,
                         RowExclusiveLock);
 
    /*
     * 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();
 
    /*
     * 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;
 
        tuple = GetDatabaseTuple(dbname);
        if (!HeapTupleIsValid(tuple) ||
            MyDatabaseId != ((Form_pg_database) GETSTRUCT(tuple))->oid ||
            MyDatabaseTableSpace != ((Form_pg_database) GETSTRUCT(tuple))->dattablespace)
            ereport(FATAL,
                    (errcode(ERRCODE_UNDEFINED_DATABASE),
                     errmsg("database \"%s\" does not exist", dbname),
                     errdetail("It seems to have just been dropped or renamed.")));
    }
 
    /*
     * 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, override_allow_connections);
 
    /*
     * 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 (load_session_libraries)
        process_session_preload_libraries();
 
    /* report this backend in the PgBackendStatus array */
    if (!bootstrap)
        pgstat_bestart();
 
    /* close the transaction we started above */
    if (!bootstrap)
        CommitTransactionCommand();
}

References am_db_walsender, am_walsender, Assert(), ClientConnectionInfo::auth_method, ClientConnectionInfo::authn_id, before_shmem_exit(), CheckDeadLockAlert(), CheckMyDatabase(), CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler(), CommitTransactionCommand(), CreateAuxProcessResourceOwner(), CurrentResourceOwner, PGPROC::databaseId, dbname, DEADLOCK_TIMEOUT, DEBUG3, elog(), EnablePortalManager(), ereport, errcode(), errcode_for_file_access(), errdetail(), errhint(), errmsg(), FATAL, GetDatabasePath(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetSessionUserId(), GETSTRUCT, GetTransactionSnapshot(), 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(), InitCatalogCache(), initialize_acl(), InitializeClientEncoding(), InitializeSearchPath(), InitializeSession(), InitializeSessionUserId(), InitializeSessionUserIdStandalone(), InitializeSystemUser(), InitPlanCache(), InitProcessPhase2(), InvalidateCatalogSnapshot(), InvalidBackendId, IsAutoVacuumLauncherProcess(), IsAutoVacuumWorkerProcess(), IsBackgroundWorker, IsBinaryUpgrade, IsBootstrapProcessingMode, IsUnderPostmaster, LOCK_TIMEOUT, LockSharedObject(), LockTimeoutHandler(), MaxBackends, MyBackendId, MyClientConnectionInfo, MyDatabaseId, MyDatabaseTableSpace, MyProc, MyProcPort, NAMEDATALEN, NameStr, OidIsValid, PerformAuthentication(), pfree(), pg_usleep(), pgstat_before_server_shutdown(), pgstat_beinit(), pgstat_bestart(), 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(), username, ValidatePgVersion(), WARNING, XACT_READ_COMMITTED, and XactIsoLevel.

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

LockTimeoutHandler()

static void LockTimeoutHandler ( void  )

static

Definition at line 1375 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 190 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
 
    /*
     * 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);
 
    if (Log_connections)
    {
        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, principal=%s)"),
                                 be_gssapi_get_auth(port) ? _("yes") : _("no"),
                                 be_gssapi_get_enc(port) ? _("yes") : _("no"),
                                 princ);
            else
                appendStringInfo(&logmsg,
                                 _(" GSS (authenticated=%s, encrypted=%s)"),
                                 be_gssapi_get_auth(port) ? _("yes") : _("no"),
                                 be_gssapi_get_enc(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(), AuthenticationTimeout, be_gssapi_get_auth(), be_gssapi_get_enc(), be_gssapi_get_princ(), be_tls_get_cipher(), be_tls_get_cipher_bits(), be_tls_get_version(), ClientAuthentication(), ClientAuthInProgress, StringInfoData::data, disable_timeout(), enable_timeout_after(), ereport, errmsg(), errmsg_internal(), FATAL, HbaFileName, initStringInfo(), load_hba(), load_ident(), LOG, 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 505 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 1302 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 1237 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 1336 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 1353 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 1420 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().