Header And Logo
|
#include "postgres.h"#include <ctype.h>#include <fcntl.h>#include <unistd.h>#include "access/heapam.h"#include "access/htup_details.h"#include "access/sysattr.h"#include "access/xact.h"#include "catalog/catalog.h"#include "catalog/indexing.h"#include "catalog/namespace.h"#include "catalog/pg_authid.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/walsender.h"#include "storage/bufmgr.h"#include "storage/fd.h"#include "storage/ipc.h"#include "storage/lmgr.h"#include "storage/procarray.h"#include "storage/procsignal.h"#include "storage/proc.h"#include "storage/sinvaladt.h"#include "storage/smgr.h"#include "tcop/tcopprot.h"#include "utils/acl.h"#include "utils/fmgroids.h"#include "utils/guc.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 "utils/tqual.h"
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) |
| static void | InitCommunication (void) |
| static void | ShutdownPostgres (int code, Datum arg) |
| static void | StatementTimeoutHandler (void) |
| static void | LockTimeoutHandler (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, char *optstr) |
| void | InitializeMaxBackends (void) |
| void | BaseInit (void) |
| void | InitPostgres (const char *in_dbname, Oid dboid, const char *username, char *out_dbname) |
| void BaseInit | ( | void | ) |
Definition at line 460 of file postinit.c.
References DebugFileOpen(), InitBufferPoolAccess(), InitCommunication(), InitFileAccess(), and smgrinit().
Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), AuxiliaryProcessMain(), do_start_bgworker(), and PostgresMain().
{
/*
* Attach to shared memory and semaphores, and initialize our
* input/output/debugging file descriptors.
*/
InitCommunication();
DebugFileOpen();
/* Do local initialization of file, storage and buffer managers */
InitFileAccess();
smgrinit();
InitBufferPoolAccess();
}
| static void CheckMyDatabase | ( | const char * | name, | |
| bool | am_superuser | |||
| ) | [static] |
Definition at line 252 of file postinit.c.
References ACL_CONNECT, ACLCHECK_OK, CountDBBackends(), DATABASEOID, elog, ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, FATAL, GetDatabaseEncodingName(), GETSTRUCT, GetUserId(), HeapTupleIsValid, IsAutoVacuumWorkerProcess(), IsUnderPostmaster, MyDatabaseId, NameStr, NULL, ObjectIdGetDatum, pg_bind_textdomain_codeset(), pg_database_aclcheck(), pg_perm_setlocale(), PGC_BACKEND, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT, PGC_S_OVERRIDE, ReleaseSysCache(), SearchSysCache1, SetConfigOption(), and SetDatabaseEncoding().
Referenced by InitPostgres().
{
HeapTuple tup;
Form_pg_database dbform;
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;".
*
* We do not enforce them for autovacuum worker processes either.
*/
if (IsUnderPostmaster && !IsAutoVacuumWorkerProcess())
{
/*
* Check that the database is currently allowing connections.
*/
if (!dbform->datallowconn)
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 &&
pg_database_aclcheck(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 &&
CountDBBackends(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_OVERRIDE);
/* 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 */
collate = NameStr(dbform->datcollate);
ctype = NameStr(dbform->datctype);
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.")));
/* Make the locale settings visible as GUC variables, too */
SetConfigOption("lc_collate", collate, PGC_INTERNAL, PGC_S_OVERRIDE);
SetConfigOption("lc_ctype", ctype, PGC_INTERNAL, PGC_S_OVERRIDE);
/* Use the right encoding in translated messages */
#ifdef ENABLE_NLS
pg_bind_textdomain_codeset(textdomain(NULL));
#endif
ReleaseSysCache(tup);
}
| static HeapTuple GetDatabaseTuple | ( | const char * | dbname | ) | [static] |
Definition at line 91 of file postinit.c.
References AccessShareLock, Anum_pg_database_datname, BTEqualStrategyNumber, criticalSharedRelcachesBuilt, CStringGetDatum, DatabaseNameIndexId, DatabaseRelationId, heap_close, heap_copytuple(), heap_open(), HeapTupleIsValid, ScanKeyInit(), SnapshotNow, systable_beginscan(), systable_endscan(), and systable_getnext().
Referenced by InitPostgres().
{
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 = heap_open(DatabaseRelationId, AccessShareLock);
scan = systable_beginscan(relation, DatabaseNameIndexId,
criticalSharedRelcachesBuilt,
SnapshotNow,
1, key);
tuple = systable_getnext(scan);
/* Must copy tuple before releasing buffer */
if (HeapTupleIsValid(tuple))
tuple = heap_copytuple(tuple);
/* all done */
systable_endscan(scan);
heap_close(relation, AccessShareLock);
return tuple;
}
Definition at line 134 of file postinit.c.
References AccessShareLock, BTEqualStrategyNumber, criticalSharedRelcachesBuilt, DatabaseOidIndexId, DatabaseRelationId, heap_close, heap_copytuple(), heap_open(), HeapTupleIsValid, ObjectIdAttributeNumber, ObjectIdGetDatum, ScanKeyInit(), SnapshotNow, systable_beginscan(), systable_endscan(), and systable_getnext().
Referenced by InitPostgres().
{
HeapTuple tuple;
Relation relation;
SysScanDesc scan;
ScanKeyData key[1];
/*
* form a scan key
*/
ScanKeyInit(&key[0],
ObjectIdAttributeNumber,
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 = heap_open(DatabaseRelationId, AccessShareLock);
scan = systable_beginscan(relation, DatabaseOidIndexId,
criticalSharedRelcachesBuilt,
SnapshotNow,
1, key);
tuple = systable_getnext(scan);
/* Must copy tuple before releasing buffer */
if (HeapTupleIsValid(tuple))
tuple = heap_copytuple(tuple);
/* all done */
systable_endscan(scan);
heap_close(relation, AccessShareLock);
return tuple;
}
| static void InitCommunication | ( | void | ) | [static] |
Definition at line 378 of file postinit.c.
References CreateSharedMemoryAndSemaphores(), and IsUnderPostmaster.
Referenced by BaseInit().
{
/*
* initialize shared memory and semaphores appropriately.
*/
if (!IsUnderPostmaster) /* postmaster already did this */
{
/*
* We're running a postgres bootstrap process or a standalone backend.
* Create private "shmem" and semaphores.
*/
CreateSharedMemoryAndSemaphores(true, 0);
}
}
| void InitializeMaxBackends | ( | void | ) |
Definition at line 438 of file postinit.c.
References Assert, autovacuum_max_workers, elog, ERROR, GetNumShmemAttachedBgworkers(), MAX_BACKENDS, MaxBackends, and MaxConnections.
Referenced by AuxiliaryProcessMain(), PostgresMain(), and PostmasterMain().
{
Assert(MaxBackends == 0);
/* the extra unit accounts for the autovacuum launcher */
MaxBackends = MaxConnections + autovacuum_max_workers + 1 +
GetNumShmemAttachedBgworkers();
/* internal error because the values were all checked previously */
if (MaxBackends > MAX_BACKENDS)
elog(ERROR, "too many backends configured");
}
| void InitPostgres | ( | const char * | in_dbname, | |
| Oid | dboid, | |||
| const char * | username, | |||
| char * | out_dbname | |||
| ) |
Definition at line 498 of file postinit.c.
References am_walsender, Assert, CAC_WAITBACKUP, Port::canAcceptConnections, CheckDeadLock(), CheckMyDatabase(), CommitTransactionCommand(), PGPROC::databaseId, DatabaseRelationId, DEADLOCK_TIMEOUT, DEBUG3, elog, EnablePortalManager(), ereport, errcode(), errcode_for_file_access(), errdetail(), errhint(), errmsg(), FATAL, GetDatabasePath(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetSessionUserId(), GETSTRUCT, GetTransactionSnapshot(), GetUserId(), has_rolreplication(), HaveNFreeProcs(), HeapTupleGetOid, HeapTupleIsValid, InitBufferPoolBackend(), InitCatalogCache(), initialize_acl(), InitializeClientEncoding(), InitializeSearchPath(), InitializeSessionUserId(), InitializeSessionUserIdStandalone(), InitPlanCache(), InitProcessPhase2(), IsAutoVacuumLauncherProcess(), IsAutoVacuumWorkerProcess(), IsBackgroundWorker, IsBinaryUpgrade, IsBootstrapProcessingMode, IsUnderPostmaster, LOCK_TIMEOUT, LockSharedObject(), LockTimeoutHandler(), MaxBackends, MyBackendId, MyDatabaseId, MyDatabaseTableSpace, MyProc, MyProcPort, NameStr, NULL, on_shmem_exit(), PerformAuthentication(), pg_usleep(), pgstat_bestart(), pgstat_initialize(), PostAuthDelay, process_settings(), process_startup_options(), ProcSignalInit(), RecoveryInProgress(), RegisterTimeout(), RelationCacheInitialize(), RelationCacheInitializePhase2(), RelationCacheInitializePhase3(), ReservedBackends, RowExclusiveLock, SetCurrentStatementStartTimestamp(), SetDatabasePath(), SharedInvalBackendInit(), ShutdownPostgres(), ShutdownXLOG(), StartTransactionCommand(), StartupXLOG(), STATEMENT_TIMEOUT, StatementTimeoutHandler(), strlcpy(), superuser(), ThereIsAtLeastOneRole(), ValidatePgVersion(), WARNING, and XactIsoLevel.
Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), BackgroundWorkerInitializeConnection(), BootstrapModeMain(), and PostgresMain().
{
bool bootstrap = IsBootstrapProcessingMode();
bool am_superuser;
char *fullpath;
char dbname[NAMEDATALEN];
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, CheckDeadLock);
RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
}
/*
* bufmgr needs another initialization call too
*/
InitBufferPoolBackend();
/*
* Initialize local process's access to XLOG.
*/
if (IsUnderPostmaster)
{
/*
* The postmaster already started the XLOG machinery, but we need to
* call InitXLOGAccess(), if the system isn't in hot-standby mode.
* This is handled by calling RecoveryInProgress and ignoring the
* result.
*/
(void) RecoveryInProgress();
}
else
{
/*
* We are either a bootstrap process or a standalone backend. Either
* way, start up the XLOG machinery, and register to have it closed
* down at exit.
*/
StartupXLOG();
on_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 stats collection --- must happen before first xact */
if (!bootstrap)
pgstat_initialize();
/*
* 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 has to
* be after we've initialized all the low-level modules like the buffer
* manager, because during shutdown this has to run before the low-level
* modules start to close down. On the other hand, we want it 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.
*/
on_shmem_exit(ShutdownPostgres, 0);
/* The autovacuum launcher is done here */
if (IsAutoVacuumLauncherProcess())
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.)
*/
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)));
}
else if (IsBackgroundWorker)
{
if (username == NULL)
{
InitializeSessionUserIdStandalone();
am_superuser = true;
}
else
{
InitializeSessionUserId(username);
am_superuser = superuser();
}
}
else
{
/* normal multiuser case */
Assert(MyProcPort != NULL);
PerformAuthentication(MyProcPort);
InitializeSessionUserId(username);
am_superuser = superuser();
}
/*
* If we're trying to shut down, only superusers can connect, and new
* replication connections are not allowed.
*/
if ((!am_superuser || am_walsender) &&
MyProcPort != NULL &&
MyProcPort->canAcceptConnections == CAC_WAITBACKUP)
{
if (am_walsender)
ereport(FATAL,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("new replication connections are not allowed during database shutdown")));
else
ereport(FATAL,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to connect during database shutdown")));
}
/*
* 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 connections slots are reserved for superusers. Although
* replication connections currently require superuser privileges, we
* don't allow them to consume the reserved slots, which are intended for
* interactive use.
*/
if ((!am_superuser || am_walsender) &&
ReservedBackends > 0 &&
!HaveNFreeProcs(ReservedBackends))
ereport(FATAL,
(errcode(ERRCODE_TOO_MANY_CONNECTIONS),
errmsg("remaining connection slots are reserved for non-replication superuser connections")));
/*
* If walsender, 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)
{
Assert(!bootstrap);
if (!superuser() && !has_rolreplication(GetUserId()))
ereport(FATAL,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser or replication role to start 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 = TemplateDbOid;
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 = HeapTupleGetOid(tuple);
MyDatabaseTableSpace = dbform->dattablespace;
/* take database name from the caller, just for paranoia */
strlcpy(dbname, in_dbname, sizeof(dbname));
}
else
{
/* 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 = HeapTupleGetOid(tuple);
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);
}
/* Now we can mark our PGPROC entry with the database ID */
/* (We assume this is an atomic store so no lock is needed) */
MyProc->databaseId = MyDatabaseId;
/*
* 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 are already advertising our use of
* the database in the PGPROC array; anyone trying a DROP DATABASE after
* this point will see us there.
*
* 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);
/*
* 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 != HeapTupleGetOid(tuple) ||
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);
/*
* 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);
/*
* 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();
/* report this backend in the PgBackendStatus array */
if (!bootstrap)
pgstat_bestart();
/* close the transaction we started above */
if (!bootstrap)
CommitTransactionCommand();
}
| static void LockTimeoutHandler | ( | void | ) | [static] |
| static void PerformAuthentication | ( | Port * | port | ) | [static] |
Definition at line 180 of file postinit.c.
References am_walsender, AuthenticationTimeout, ClientAuthentication(), ClientAuthInProgress, Port::database_name, disable_timeout(), enable_timeout_after(), ereport, errmsg(), FATAL, load_hba(), load_ident(), LOG, Log_connections, set_ps_display(), STATEMENT_TIMEOUT, and Port::user_name.
Referenced by InitPostgres().
{
/* 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
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,
(errmsg("could not load pg_hba.conf")));
}
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.
*/
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)
{
if (am_walsender)
ereport(LOG,
(errmsg("replication connection authorized: user=%s",
port->user_name)));
else
ereport(LOG,
(errmsg("connection authorized: user=%s database=%s",
port->user_name, port->database_name)));
}
set_ps_display("startup", false);
ClientAuthInProgress = false; /* client_min_messages is active now */
}
| void pg_split_opts | ( | char ** | argv, | |
| int * | argcp, | |||
| char * | optstr | |||
| ) |
Definition at line 409 of file postinit.c.
Referenced by BackendRun(), and process_startup_options().
{
while (*optstr)
{
while (isspace((unsigned char) *optstr))
optstr++;
if (*optstr == '\0')
break;
argv[(*argcp)++] = optstr;
while (*optstr && !isspace((unsigned char) *optstr))
optstr++;
if (*optstr)
*optstr++ = '\0';
}
}
Definition at line 1002 of file postinit.c.
References AccessShareLock, ApplySetting(), DbRoleSettingRelationId, heap_close, heap_open(), InvalidOid, IsUnderPostmaster, PGC_S_DATABASE, PGC_S_DATABASE_USER, PGC_S_GLOBAL, and PGC_S_USER.
Referenced by InitPostgres().
{
Relation relsetting;
if (!IsUnderPostmaster)
return;
relsetting = heap_open(DbRoleSettingRelationId, AccessShareLock);
/* Later settings are ignored if set earlier. */
ApplySetting(databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
ApplySetting(InvalidOid, roleid, relsetting, PGC_S_USER);
ApplySetting(databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
ApplySetting(InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
heap_close(relsetting, AccessShareLock);
}
Definition at line 936 of file postinit.c.
References Assert, av, Port::cmdline_options, Port::guc_options, lfirst, list_head(), lnext, name, NULL, palloc(), pg_split_opts(), PGC_S_CLIENT, PGC_SUSET, process_postgres_switches(), SetConfigOption(), and value.
Referenced by InitPostgres().
{
GucContext gucctx;
ListCell *gucopts;
gucctx = am_superuser ? PGC_SUSET : 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";
/* Note this mangles port->cmdline_options */
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(gucopts);
value = lfirst(gucopts);
gucopts = lnext(gucopts);
SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
}
}
| static void ShutdownPostgres | ( | int | code, | |
| Datum | arg | |||
| ) | [static] |
Definition at line 1031 of file postinit.c.
References AbortOutOfAnyTransaction(), LockReleaseAll(), and USER_LOCKMETHOD.
Referenced by InitPostgres().
{
/* 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);
}
| static void StatementTimeoutHandler | ( | void | ) | [static] |
| static bool ThereIsAtLeastOneRole | ( | void | ) | [static] |
Definition at line 1078 of file postinit.c.
References AccessShareLock, AuthIdRelationId, ForwardScanDirection, heap_beginscan(), heap_close, heap_endscan(), heap_getnext(), heap_open(), NULL, and SnapshotNow.
Referenced by InitPostgres().
{
Relation pg_authid_rel;
HeapScanDesc scan;
bool result;
pg_authid_rel = heap_open(AuthIdRelationId, AccessShareLock);
scan = heap_beginscan(pg_authid_rel, SnapshotNow, 0, NULL);
result = (heap_getnext(scan, ForwardScanDirection) != NULL);
heap_endscan(scan);
heap_close(pg_authid_rel, AccessShareLock);
return result;
}
1.7.1