greenplumn miscinit 源码
greenplumn miscinit 代码
文件路径：/src/backend/utils/init/miscinit.c
/*-------------------------------------------------------------------------
*
* miscinit.c
* miscellaneous initialization support stuff
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/init/miscinit.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/param.h>
#include <signal.h>
#include <time.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>
#include <grp.h>
#include <pwd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif
#include "access/htup_details.h"
#include "catalog/pg_authid.h"
#include "common/file_perm.h"
#include "libpq/libpq.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/fts.h"
#include "postmaster/postmaster.h"
#include "postmaster/startup.h"
#include "replication/walsender.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "utils/builtins.h"
#include "utils/faultinjector.h"
#include "utils/gdd.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/pidfile.h"
#include "utils/syscache.h"
#include "utils/varlena.h"
#include "cdb/cdbvars.h"
#include "utils/resgroup.h"
#include "utils/resource_manager.h"
#include "utils/resscheduler.h"
#define DIRECTORY_LOCK_FILE "postmaster.pid"
ProcessingMode Mode = InitProcessing;
/* List of lock files to be removed at proc exit */
static List *lock_files = NIL;
static Latch LocalLatchData;
/* ----------------------------------------------------------------
* ignoring system indexes support stuff
*
* NOTE: "ignoring system indexes" means we do not use the system indexes
* for lookups (either in hardwired catalog accesses or in planner-generated
* plans). We do, however, still update the indexes when a catalog
* modification is made.
* ----------------------------------------------------------------
*/
bool IgnoreSystemIndexes = false;
/* ----------------------------------------------------------------
* database path / name support stuff
* ----------------------------------------------------------------
*/
void
SetDatabasePath(const char *path)
{
/* This should happen only once per process */
Assert(!DatabasePath);
DatabasePath = MemoryContextStrdup(TopMemoryContext, path);
}
/*
* Validate the proposed data directory.
*
* Also initialize file and directory create modes and mode mask.
*/
void
checkDataDir(void)
{
struct stat stat_buf;
Assert(DataDir);
if (stat(DataDir, &stat_buf) != 0)
{
if (errno == ENOENT)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("data directory \"%s\" does not exist",
DataDir)));
else
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not read permissions of directory \"%s\": %m",
DataDir)));
}
/* eventual chdir would fail anyway, but let's test ... */
if (!S_ISDIR(stat_buf.st_mode))
ereport(FATAL,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("specified data directory \"%s\" is not a directory",
DataDir)));
/*
* Check that the directory belongs to my userid; if not, reject.
*
* This check is an essential part of the interlock that prevents two
* postmasters from starting in the same directory (see CreateLockFile()).
* Do not remove or weaken it.
*
* XXX can we safely enable this check on Windows?
*/
#if !defined(WIN32) && !defined(__CYGWIN__)
if (stat_buf.st_uid != geteuid())
ereport(FATAL,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("data directory \"%s\" has wrong ownership",
DataDir),
errhint("The server must be started by the user that owns the data directory.")));
#endif
/*
* Check if the directory has correct permissions. If not, reject.
*
* Only two possible modes are allowed, 0700 and 0750. The latter mode
* indicates that group read/execute should be allowed on all newly
* created files and directories.
*
* XXX temporarily suppress check when on Windows, because there may not
* be proper support for Unix-y file permissions. Need to think of a
* reasonable check to apply on Windows.
*/
#if !defined(WIN32) && !defined(__CYGWIN__)
if (stat_buf.st_mode & PG_MODE_MASK_GROUP)
ereport(FATAL,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("data directory \"%s\" has invalid permissions",
DataDir),
errdetail("Permissions should be u=rwx (0700) or u=rwx,g=rx (0750).")));
#endif
/*
* Reset creation modes and mask based on the mode of the data directory.
*
* The mask was set earlier in startup to disallow group permissions on
* newly created files and directories. However, if group read/execute
* are present on the data directory then modify the create modes and mask
* to allow group read/execute on newly created files and directories and
* set the data_directory_mode GUC.
*
* Suppress when on Windows, because there may not be proper support for
* Unix-y file permissions.
*/
#if !defined(WIN32) && !defined(__CYGWIN__)
SetDataDirectoryCreatePerm(stat_buf.st_mode);
umask(pg_mode_mask);
data_directory_mode = pg_dir_create_mode;
#endif
/* Check for PG_VERSION */
ValidatePgVersion(DataDir);
}
/*
* Set data directory, but make sure it's an absolute path. Use this,
* never set DataDir directly.
*/
void
SetDataDir(const char *dir)
{
char *new;
AssertArg(dir);
/* If presented path is relative, convert to absolute */
new = make_absolute_path(dir);
if (DataDir)
free(DataDir);
DataDir = new;
}
/*
* Change working directory to DataDir. Most of the postmaster and backend
* code assumes that we are in DataDir so it can use relative paths to access
* stuff in and under the data directory. For convenience during path
* setup, however, we don't force the chdir to occur during SetDataDir.
*/
void
ChangeToDataDir(void)
{
AssertState(DataDir);
if (chdir(DataDir) < 0)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not change directory to \"%s\": %m",
DataDir)));
}
/* ----------------------------------------------------------------
* User ID state
*
* We have to track several different values associated with the concept
* of "user ID".
*
* AuthenticatedUserId is determined at connection start and never changes.
*
* SessionUserId is initially the same as AuthenticatedUserId, but can be
* changed by SET SESSION AUTHORIZATION (if AuthenticatedUserIsSuperuser).
* This is the ID reported by the SESSION_USER SQL function.
*
* OuterUserId is the current user ID in effect at the "outer level" (outside
* any transaction or function). This is initially the same as SessionUserId,
* but can be changed by SET ROLE to any role that SessionUserId is a
* member of. (XXX rename to something like CurrentRoleId?)
*
* CurrentUserId is the current effective user ID; this is the one to use
* for all normal permissions-checking purposes. At outer level this will
* be the same as OuterUserId, but it changes during calls to SECURITY
* DEFINER functions, as well as locally in some specialized commands.
*
* SecurityRestrictionContext holds flags indicating reason(s) for changing
* CurrentUserId. In some cases we need to lock down operations that are
* not directly controlled by privilege settings, and this provides a
* convenient way to do it.
* ----------------------------------------------------------------
*/
static Oid AuthenticatedUserId = InvalidOid;
static Oid SessionUserId = InvalidOid;
static Oid OuterUserId = InvalidOid;
static Oid CurrentUserId = InvalidOid;
/* We also have to remember the superuser state of some of these levels */
static bool AuthenticatedUserIsSuperuser = false;
static bool SessionUserIsSuperuser = false;
static int SecurityRestrictionContext = 0;
/* We also remember if a SET ROLE is currently active */
static bool SetRoleIsActive = false;
/*
* Initialize the basic environment for a postmaster child
*
* Should be called as early as possible after the child's startup.
*/
void
InitPostmasterChild(void)
{
IsUnderPostmaster = true; /* we are a postmaster subprocess now */
InitProcessGlobals();
/*
* make sure stderr is in binary mode before anything can possibly be
* written to it, in case it's actually the syslogger pipe, so the pipe
* chunking protocol isn't disturbed. Non-logpipe data gets translated on
* redirection (e.g. via pg_ctl -l) anyway.
*/
#ifdef WIN32
_setmode(fileno(stderr), _O_BINARY);
#endif
/* We don't want the postmaster's proc_exit() handlers */
on_exit_reset();
/* Initialize process-local latch support */
InitializeLatchSupport();
MyLatch = &LocalLatchData;
InitLatch(MyLatch);
/*
* If possible, make this process a group leader, so that the postmaster
* can signal any child processes too. Not all processes will have
* children, but for consistency we make all postmaster child processes do
* this.
*/
#ifdef HAVE_SETSID
if (setsid() < 0)
elog(FATAL, "setsid() failed: %m");
#endif
/* Request a signal if the postmaster dies, if possible. */
PostmasterDeathSignalInit();
}
/*
* Initialize the basic environment for a standalone process.
*
* argv0 has to be suitable to find the program's executable.
*/
void
InitStandaloneProcess(const char *argv0)
{
Assert(!IsPostmasterEnvironment);
InitProcessGlobals();
/* Initialize process-local latch support */
InitializeLatchSupport();
MyLatch = &LocalLatchData;
InitLatch(MyLatch);
/* Compute paths, no postmaster to inherit from */
if (my_exec_path[0] == '\0')
{
if (find_my_exec(argv0, my_exec_path) < 0)
elog(FATAL, "%s: could not locate my own executable path",
argv0);
}
if (pkglib_path[0] == '\0')
get_pkglib_path(my_exec_path, pkglib_path);
}
void
SwitchToSharedLatch(void)
{
Assert(MyLatch == &LocalLatchData);
Assert(MyProc != NULL);
MyLatch = &MyProc->procLatch;
if (FeBeWaitSet)
ModifyWaitEvent(FeBeWaitSet, 1, WL_LATCH_SET, MyLatch);
/*
* Set the shared latch as the local one might have been set. This
* shouldn't normally be necessary as code is supposed to check the
* condition before waiting for the latch, but a bit care can't hurt.
*/
SetLatch(MyLatch);
}
void
SwitchBackToLocalLatch(void)
{
Assert(MyLatch != &LocalLatchData);
Assert(MyProc != NULL && MyLatch == &MyProc->procLatch);
MyLatch = &LocalLatchData;
if (FeBeWaitSet)
ModifyWaitEvent(FeBeWaitSet, 1, WL_LATCH_SET, MyLatch);
SetLatch(MyLatch);
}
/*
* GetUserId - get the current effective user ID.
*
* Note: there's no SetUserId() anymore; use SetUserIdAndSecContext().
*/
Oid
GetUserId(void)
{
AssertState(OidIsValid(CurrentUserId));
return CurrentUserId;
}
/*
* GetOuterUserId/SetOuterUserId - get/set the outer-level user ID.
*/
Oid
GetOuterUserId(void)
{
AssertState(OidIsValid(OuterUserId));
return OuterUserId;
}
static void
SetOuterUserId(Oid userid)
{
AssertState(SecurityRestrictionContext == 0);
AssertArg(OidIsValid(userid));
OuterUserId = userid;
/* We force the effective user ID to match, too */
CurrentUserId = userid;
}
/*
* GetSessionUserId/SetSessionUserId - get/set the session user ID.
*/
Oid
GetSessionUserId(void)
{
AssertState(OidIsValid(SessionUserId));
return SessionUserId;
}
/* extern so DispatchAgent can use this (postgres.c) */
extern void
SetSessionUserId(Oid userid, bool is_superuser)
{
AssertState(SecurityRestrictionContext == 0);
AssertArg(OidIsValid(userid));
SessionUserId = userid;
SessionUserIsSuperuser = is_superuser;
SetRoleIsActive = false;
/* We force the effective user IDs to match, too */
OuterUserId = userid;
CurrentUserId = userid;
}
bool
IsAuthenticatedUserSuperUser()
{
AssertState(OidIsValid(AuthenticatedUserId));
return AuthenticatedUserIsSuperuser;
}
/*
* GetAuthenticatedUserId - get the authenticated user ID
*/
Oid
GetAuthenticatedUserId(void)
{
AssertState(OidIsValid(AuthenticatedUserId));
return AuthenticatedUserId;
}
/*
* GetUserIdAndSecContext/SetUserIdAndSecContext - get/set the current user ID
* and the SecurityRestrictionContext flags.
*
* Currently there are three valid bits in SecurityRestrictionContext:
*
* SECURITY_LOCAL_USERID_CHANGE indicates that we are inside an operation
* that is temporarily changing CurrentUserId via these functions. This is
* needed to indicate that the actual value of CurrentUserId is not in sync
* with guc.c's internal state, so SET ROLE has to be disallowed.
*
* SECURITY_RESTRICTED_OPERATION indicates that we are inside an operation
* that does not wish to trust called user-defined functions at all. This
* bit prevents not only SET ROLE, but various other changes of session state
* that normally is unprotected but might possibly be used to subvert the
* calling session later. An example is replacing an existing prepared
* statement with new code, which will then be executed with the outer
* session's permissions when the prepared statement is next used. Since
* these restrictions are fairly draconian, we apply them only in contexts
* where the called functions are really supposed to be side-effect-free
* anyway, such as VACUUM/ANALYZE/REINDEX.
*
* SECURITY_NOFORCE_RLS indicates that we are inside an operation which should
* ignore the FORCE ROW LEVEL SECURITY per-table indication. This is used to
* ensure that FORCE RLS does not mistakenly break referential integrity
* checks. Note that this is intentionally only checked when running as the
* owner of the table (which should always be the case for referential
* integrity checks).
*
* Unlike GetUserId, GetUserIdAndSecContext does *not* Assert that the current
* value of CurrentUserId is valid; nor does SetUserIdAndSecContext require
* the new value to be valid. In fact, these routines had better not
* ever throw any kind of error. This is because they are used by
* StartTransaction and AbortTransaction to save/restore the settings,
* and during the first transaction within a backend, the value to be saved
* and perhaps restored is indeed invalid. We have to be able to get
* through AbortTransaction without asserting in case InitPostgres fails.
*/
void
GetUserIdAndSecContext(Oid *userid, int *sec_context)
{
*userid = CurrentUserId;
*sec_context = SecurityRestrictionContext;
}
void
SetUserIdAndSecContext(Oid userid, int sec_context)
{
CurrentUserId = userid;
SecurityRestrictionContext = sec_context;
}
/*
* InLocalUserIdChange - are we inside a local change of CurrentUserId?
*/
bool
InLocalUserIdChange(void)
{
return (SecurityRestrictionContext & SECURITY_LOCAL_USERID_CHANGE) != 0;
}
/*
* InSecurityRestrictedOperation - are we inside a security-restricted command?
*/
bool
InSecurityRestrictedOperation(void)
{
return (SecurityRestrictionContext & SECURITY_RESTRICTED_OPERATION) != 0;
}
/*
* InNoForceRLSOperation - are we ignoring FORCE ROW LEVEL SECURITY ?
*/
bool
InNoForceRLSOperation(void)
{
return (SecurityRestrictionContext & SECURITY_NOFORCE_RLS) != 0;
}
/*
* These are obsolete versions of Get/SetUserIdAndSecContext that are
* only provided for bug-compatibility with some rather dubious code in
* pljava. We allow the userid to be set, but only when not inside a
* security restriction context.
*/
void
GetUserIdAndContext(Oid *userid, bool *sec_def_context)
{
*userid = CurrentUserId;
*sec_def_context = InLocalUserIdChange();
}
void
SetUserIdAndContext(Oid userid, bool sec_def_context)
{
/* We throw the same error SET ROLE would. */
if (InSecurityRestrictedOperation())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("cannot set parameter \"%s\" within security-restricted operation",
"role")));
CurrentUserId = userid;
if (sec_def_context)
SecurityRestrictionContext |= SECURITY_LOCAL_USERID_CHANGE;
else
SecurityRestrictionContext &= ~SECURITY_LOCAL_USERID_CHANGE;
}
/*
* Check whether specified role has explicit REPLICATION privilege
*/
bool
has_rolreplication(Oid roleid)
{
bool result = false;
HeapTuple utup;
utup = SearchSysCache1(AUTHOID, ObjectIdGetDatum(roleid));
if (HeapTupleIsValid(utup))
{
result = ((Form_pg_authid) GETSTRUCT(utup))->rolreplication;
ReleaseSysCache(utup);
}
return result;
}
/*
* Initialize user identity during normal backend startup
*/
void
InitializeSessionUserId(const char *rolename, Oid roleid)
{
HeapTuple roleTup;
Form_pg_authid rform;
char *rname;
/*
* Don't do scans if we're bootstrapping, none of the system catalogs
* exist yet, and they should be owned by postgres anyway.
*/
AssertState(!IsBootstrapProcessingMode());
/* call only once */
AssertState(!OidIsValid(AuthenticatedUserId));
/*
* Make sure syscache entries are flushed for recent catalog changes. This
* allows us to find roles that were created on-the-fly during
* authentication.
*/
AcceptInvalidationMessages();
if (rolename != NULL)
{
roleTup = SearchSysCache1(AUTHNAME, PointerGetDatum(rolename));
if (!HeapTupleIsValid(roleTup))
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("role \"%s\" does not exist", rolename)));
}
else
{
roleTup = SearchSysCache1(AUTHOID, ObjectIdGetDatum(roleid));
if (!HeapTupleIsValid(roleTup))
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("role with OID %u does not exist", roleid)));
}
rform = (Form_pg_authid) GETSTRUCT(roleTup);
roleid = rform->oid;
rname = NameStr(rform->rolname);
AuthenticatedUserId = roleid;
AuthenticatedUserIsSuperuser = rform->rolsuper;
/* This sets OuterUserId/CurrentUserId too */
SetSessionUserId(roleid, AuthenticatedUserIsSuperuser);
/* Also mark our PGPROC entry with the authenticated user id */
/* (We assume this is an atomic store so no lock is needed) */
MyProc->roleId = roleid;
/*
* These next checks are not enforced when in standalone mode, so that
* there is a way to recover from sillinesses like "UPDATE pg_authid SET
* rolcanlogin = false;".
*/
if (IsUnderPostmaster)
{
/*
* Is role allowed to login at all?
*/
if (!rform->rolcanlogin)
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("role \"%s\" is not permitted to log in",
rname)));
/*
* Check connection limit for this role.
*
* There is a race condition here --- we create our PGPROC before
* checking for other PGPROCs. If two backends did this at about the
* same time, they might both think they were over the limit, while
* ideally one should succeed and one fail. Getting that to work
* exactly seems more trouble than it is worth, however; instead we
* just document that the connection limit is approximate.
*
* We do not want to do this for QEs since a single QD might initialise
* many connections to each segment to execute a non-trivial plan and
* the user connection limit does not map, semantically, to that idea.
*/
if (Gp_role == GP_ROLE_DISPATCH && rform->rolconnlimit >= 0 &&
!AuthenticatedUserIsSuperuser &&
CountUserBackends(roleid) > rform->rolconnlimit)
ereport(FATAL,
(errcode(ERRCODE_TOO_MANY_CONNECTIONS),
errmsg("too many connections for role \"%s\"",
rname)));
}
/*
* If resource scheduling is enabled, then set cached value for the
* queue. Do this even in standalone backend mode, just in case someone
* gives the superuser a resource queue.
*/
if ((Gp_role == GP_ROLE_DISPATCH || Gp_role == GP_ROLE_EXECUTE) && IsResQueueEnabled())
{
SetResQueueId();
}
/* Record username and superuser status as GUC settings too */
SetConfigOption("session_authorization", rname,
PGC_BACKEND, PGC_S_OVERRIDE);
SetConfigOption("is_superuser",
AuthenticatedUserIsSuperuser ? "on" : "off",
PGC_INTERNAL, PGC_S_OVERRIDE);
ReleaseSysCache(roleTup);
}
/*
* Initialize user identity during special backend startup
*/
void
InitializeSessionUserIdStandalone(void)
{
/*
* This function should only be called in single-user mode, in autovacuum
* workers, and in background workers.
*/
AssertState(!IsUnderPostmaster || IsAutoVacuumWorkerProcess() || IsBackgroundWorker
|| am_startup
|| (am_faulthandler && am_mirror)
|| (am_ftshandler && am_mirror));
/* call only once */
AssertState(!OidIsValid(AuthenticatedUserId));
AuthenticatedUserId = BOOTSTRAP_SUPERUSERID;
AuthenticatedUserIsSuperuser = true;
SetSessionUserId(BOOTSTRAP_SUPERUSERID, true);
}
/*
* Change session auth ID while running
*
* Only a superuser may set auth ID to something other than himself. Note
* that in case of multiple SETs in a single session, the original userid's
* superuserness is what matters. But we set the GUC variable is_superuser
* to indicate whether the *current* session userid is a superuser.
*
* Note: this is not an especially clean place to do the permission check.
* It's OK because the check does not require catalog access and can't
* fail during an end-of-transaction GUC reversion, but we may someday
* have to push it up into assign_session_authorization.
*/
void
SetSessionAuthorization(Oid userid, bool is_superuser)
{
/* Must have authenticated already, else can't make permission check */
AssertState(OidIsValid(AuthenticatedUserId));
if (userid != AuthenticatedUserId &&
!AuthenticatedUserIsSuperuser)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to set session authorization")));
SetSessionUserId(userid, is_superuser);
/* If resource scheduling enabled, set the cached queue for the new role.*/
if ((Gp_role == GP_ROLE_DISPATCH || Gp_role == GP_ROLE_EXECUTE) && IsResQueueEnabled())
{
SetResQueueId();
}
SetConfigOption("is_superuser",
is_superuser ? "on" : "off",
PGC_INTERNAL, PGC_S_OVERRIDE);
}
/*
* Report current role id
* This follows the semantics of SET ROLE, ie return the outer-level ID
* not the current effective ID, and return InvalidOid when the setting
* is logically SET ROLE NONE.
*/
Oid
GetCurrentRoleId(void)
{
if (SetRoleIsActive)
return OuterUserId;
else
return InvalidOid;
}
/*
* Change Role ID while running (SET ROLE)
*
* If roleid is InvalidOid, we are doing SET ROLE NONE: revert to the
* session user authorization. In this case the is_superuser argument
* is ignored.
*
* When roleid is not InvalidOid, the caller must have checked whether
* the session user has permission to become that role. (We cannot check
* here because this routine must be able to execute in a failed transaction
* to restore a prior value of the ROLE GUC variable.)
*/
void
SetCurrentRoleId(Oid roleid, bool is_superuser)
{
/*
* Get correct info if it's SET ROLE NONE
*
* If SessionUserId hasn't been set yet, just do nothing --- the eventual
* SetSessionUserId call will fix everything. This is needed since we
* will get called during GUC initialization.
*/
if (!OidIsValid(roleid))
{
if (!OidIsValid(SessionUserId))
return;
roleid = SessionUserId;
is_superuser = SessionUserIsSuperuser;
SetRoleIsActive = false;
}
else
SetRoleIsActive = true;
SetOuterUserId(roleid);
/* If resource scheduling enabled, set the cached queue for the new role.*/
if ((Gp_role == GP_ROLE_DISPATCH || Gp_role == GP_ROLE_EXECUTE) && IsResQueueEnabled())
{
SetResQueueId();
}
SetConfigOption("is_superuser",
is_superuser ? "on" : "off",
PGC_INTERNAL, PGC_S_OVERRIDE);
}
/*
* Get user name from user oid, returns NULL for nonexistent roleid if noerr
* is true.
*/
char *
GetUserNameFromId(Oid roleid, bool noerr)
{
HeapTuple tuple;
char *result;
tuple = SearchSysCache1(AUTHOID, ObjectIdGetDatum(roleid));
if (!HeapTupleIsValid(tuple))
{
if (!noerr)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid role OID: %u", roleid)));
result = NULL;
}
else
{
result = pstrdup(NameStr(((Form_pg_authid) GETSTRUCT(tuple))->rolname));
ReleaseSysCache(tuple);
}
return result;
}
/*-------------------------------------------------------------------------
* Interlock-file support
*
* These routines are used to create both a data-directory lockfile
* ($DATADIR/postmaster.pid) and Unix-socket-file lockfiles ($SOCKFILE.lock).
* Both kinds of files contain the same info initially, although we can add
* more information to a data-directory lockfile after it's created, using
* AddToDataDirLockFile(). See miscadmin.h for documentation of the contents
* of these lockfiles.
*
* On successful lockfile creation, a proc_exit callback to remove the
* lockfile is automatically created.
*-------------------------------------------------------------------------
*/
/*
* proc_exit callback to remove lockfiles.
*/
static void
UnlinkLockFiles(int status, Datum arg)
{
ListCell *l;
foreach(l, lock_files)
{
char *curfile = (char *) lfirst(l);
unlink(curfile);
/* Should we complain if the unlink fails? */
}
/* Since we're about to exit, no need to reclaim storage */
lock_files = NIL;
/*
* Lock file removal should always be the last externally visible action
* of a postmaster or standalone backend, while we won't come here at all
* when exiting postmaster child processes. Therefore, this is a good
* place to log completion of shutdown. We could alternatively teach
* proc_exit() to do it, but that seems uglier. In a standalone backend,
* use NOTICE elevel to be less chatty.
*/
ereport(IsPostmasterEnvironment ? LOG : NOTICE,
(errmsg("database system is shut down")));
}
/*
* Create a lockfile.
*
* filename is the path name of the lockfile to create.
* amPostmaster is used to determine how to encode the output PID.
* socketDir is the Unix socket directory path to include (possibly empty).
* isDDLock and refName are used to determine what error message to produce.
*/
static void
CreateLockFile(const char *filename, bool amPostmaster,
const char *socketDir,
bool isDDLock, const char *refName)
{
int fd;
char buffer[MAXPGPATH * 2 + 256];
int ntries;
int len;
int encoded_pid;
pid_t other_pid;
pid_t my_pid,
my_p_pid,
my_gp_pid;
const char *envvar;
/*
* If the PID in the lockfile is our own PID or our parent's or
* grandparent's PID, then the file must be stale (probably left over from
* a previous system boot cycle). We need to check this because of the
* likelihood that a reboot will assign exactly the same PID as we had in
* the previous reboot, or one that's only one or two counts larger and
* hence the lockfile's PID now refers to an ancestor shell process. We
* allow pg_ctl to pass down its parent shell PID (our grandparent PID)
* via the environment variable PG_GRANDPARENT_PID; this is so that
* launching the postmaster via pg_ctl can be just as reliable as
* launching it directly. There is no provision for detecting
* further-removed ancestor processes, but if the init script is written
* carefully then all but the immediate parent shell will be root-owned
* processes and so the kill test will fail with EPERM. Note that we
* cannot get a false negative this way, because an existing postmaster
* would surely never launch a competing postmaster or pg_ctl process
* directly.
*/
my_pid = getpid();
#ifndef WIN32
my_p_pid = getppid();
#else
/*
* Windows hasn't got getppid(), but doesn't need it since it's not using
* real kill() either...
*/
my_p_pid = 0;
#endif
envvar = getenv("PG_GRANDPARENT_PID");
if (envvar)
my_gp_pid = atoi(envvar);
else
my_gp_pid = 0;
/*
* We need a loop here because of race conditions. But don't loop forever
* (for example, a non-writable $PGDATA directory might cause a failure
* that won't go away). 100 tries seems like plenty.
*/
for (ntries = 0;; ntries++)
{
/*
* Try to create the lock file --- O_EXCL makes this atomic.
*
* Think not to make the file protection weaker than 0600/0640. See
* comments below.
*/
fd = open(filename, O_RDWR | O_CREAT | O_EXCL, pg_file_create_mode);
if (fd >= 0)
break; /* Success; exit the retry loop */
/*
* Couldn't create the pid file. Probably it already exists.
*/
if ((errno != EEXIST && errno != EACCES) || ntries > 100)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not create lock file \"%s\": %m",
filename)));
/*
* Read the file to get the old owner's PID. Note race condition
* here: file might have been deleted since we tried to create it.
*/
fd = open(filename, O_RDONLY, pg_file_create_mode);
if (fd < 0)
{
if (errno == ENOENT)
continue; /* race condition; try again */
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not open lock file \"%s\": %m",
filename)));
}
pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_CREATE_READ);
if ((len = read(fd, buffer, sizeof(buffer) - 1)) < 0)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not read lock file \"%s\": %m",
filename)));
pgstat_report_wait_end();
close(fd);
if (len == 0)
{
ereport(FATAL,
(errcode(ERRCODE_LOCK_FILE_EXISTS),
errmsg("lock file \"%s\" is empty", filename),
errhint("Either another server is starting, or the lock file is the remnant of a previous server startup crash.")));
}
buffer[len] = '\0';
encoded_pid = atoi(buffer);
/* if pid < 0, the pid is for postgres, not postmaster */
other_pid = (pid_t) (encoded_pid < 0 ? -encoded_pid : encoded_pid);
if (other_pid <= 0)
elog(FATAL, "bogus data in lock file \"%s\": \"%s\"",
filename, buffer);
/*
* Check to see if the other process still exists
*
* Per discussion above, my_pid, my_p_pid, and my_gp_pid can be
* ignored as false matches.
*
* Normally kill() will fail with ESRCH if the given PID doesn't
* exist.
*
* We can treat the EPERM-error case as okay because that error
* implies that the existing process has a different userid than we
* do, which means it cannot be a competing postmaster. A postmaster
* cannot successfully attach to a data directory owned by a userid
* other than its own, as enforced in checkDataDir(). Also, since we
* create the lockfiles mode 0600/0640, we'd have failed above if the
* lockfile belonged to another userid --- which means that whatever
* process kill() is reporting about isn't the one that made the
* lockfile. (NOTE: this last consideration is the only one that
* keeps us from blowing away a Unix socket file belonging to an
* instance of Postgres being run by someone else, at least on
* machines where /tmp hasn't got a stickybit.)
*/
if (other_pid != my_pid && other_pid != my_p_pid &&
other_pid != my_gp_pid)
{
if (kill(other_pid, 0) == 0 ||
(errno != ESRCH && errno != EPERM))
{
/* lockfile belongs to a live process */
/* Check /proc/<pid>/cmdline to see if it is a postmaster process
* We check if it is a postmaster process by checking for
* the string "bin/postgres -D <data_directory>". If it is present
* in the /proc file, then it is probably a postmaster. Otherwise
* we just ignore this and proceed to next step.
* */
#if defined(__linux__)
char pid_proc_file[255];
char proc_buffer[MAXPGPATH + 100];
char target_cmdline[MAXPGPATH + 100];
bool can_read_proc_file = false;
memset(pid_proc_file, 0, sizeof(pid_proc_file));
memset(proc_buffer, 0, sizeof(proc_buffer));
memset(target_cmdline, 0, sizeof(target_cmdline));
snprintf(pid_proc_file, sizeof(pid_proc_file), "/proc/%d/cmdline", (int)other_pid);
snprintf(target_cmdline, sizeof(target_cmdline), "bin/postgres -D %s", refName);
int fp = open(pid_proc_file, O_RDONLY, 0600);
if (fp > 0)
{
if ((len = read(fp, proc_buffer, sizeof(proc_buffer) - 1)) < 0)
{
ereport(WARNING,
(errcode_for_file_access(),
errmsg("could not read proc file \"%s\": %m",
pid_proc_file)));
}
else
{
proc_buffer[len] = '\0';
can_read_proc_file = true;
}
close(fp);
}
if ( !can_read_proc_file || (strstr(proc_buffer, target_cmdline) != NULL))
{
#endif
ereport(FATAL,
(errcode(ERRCODE_LOCK_FILE_EXISTS),
errmsg("lock file \"%s\" already exists",
filename),
isDDLock ?
(encoded_pid < 0 ?
errhint("Is another postgres (PID %d) running in data directory \"%s\"?",
(int) other_pid, refName) :
errhint("Is another postmaster (PID %d) running in data directory \"%s\"?",
(int) other_pid, refName)) :
(encoded_pid < 0 ?
errhint("Is another postgres (PID %d) using socket file \"%s\"?",
(int) other_pid, refName) :
errhint("Is another postmaster (PID %d) using socket file \"%s\"?",
(int) other_pid, refName))));
#if defined(__linux__)
}
#endif
}
}
/*
* No, the creating process did not exist. However, it could be that
* the postmaster crashed (or more likely was kill -9'd by a clueless
* admin) but has left orphan backends behind. Check for this by
* looking to see if there is an associated shmem segment that is
* still in use.
*
* Note: because postmaster.pid is written in multiple steps, we might
* not find the shmem ID values in it; we can't treat that as an
* error.
*/
if (isDDLock)
{
char *ptr = buffer;
unsigned long id1,
id2;
int lineno;
for (lineno = 1; lineno < LOCK_FILE_LINE_SHMEM_KEY; lineno++)
{
if ((ptr = strchr(ptr, '\n')) == NULL)
break;
ptr++;
}
if (ptr != NULL &&
sscanf(ptr, "%lu %lu", &id1, &id2) == 2)
{
if (PGSharedMemoryIsInUse(id1, id2))
ereport(FATAL,
(errcode(ERRCODE_LOCK_FILE_EXISTS),
errmsg("pre-existing shared memory block (key %lu, ID %lu) is still in use",
id1, id2),
errhint("Terminate any old server processes associated with data directory \"%s\".",
refName)));
}
}
/*
* Looks like nobody's home. Unlink the file and try again to create
* it. Need a loop because of possible race condition against other
* would-be creators.
*/
if (unlink(filename) < 0)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not remove old lock file \"%s\": %m",
filename),
errhint("The file seems accidentally left over, but "
"it could not be removed. Please remove the file "
"by hand and try again.")));
}
/*
* Successfully created the file, now fill it. See comment in miscadmin.h
* about the contents. Note that we write the same first five lines into
* both datadir and socket lockfiles; although more stuff may get added to
* the datadir lockfile later.
*/
snprintf(buffer, sizeof(buffer), "%d\n%s\n%ld\n%d\n%s\n",
amPostmaster ? (int) my_pid : -((int) my_pid),
DataDir,
(long) MyStartTime,
PostPortNumber,
socketDir);
/*
* In a standalone backend, the next line (LOCK_FILE_LINE_LISTEN_ADDR)
* will never receive data, so fill it in as empty now.
*/
if (isDDLock && !amPostmaster)
strlcat(buffer, "\n", sizeof(buffer));
errno = 0;
pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_CREATE_WRITE);
if (write(fd, buffer, strlen(buffer)) != strlen(buffer))
{
int save_errno = errno;
close(fd);
unlink(filename);
/* if write didn't set errno, assume problem is no disk space */
errno = save_errno ? save_errno : ENOSPC;
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not write lock file \"%s\": %m", filename)));
}
pgstat_report_wait_end();
pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_CREATE_SYNC);
if (pg_fsync(fd) != 0)
{
int save_errno = errno;
close(fd);
unlink(filename);
errno = save_errno;
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not write lock file \"%s\": %m", filename)));
}
pgstat_report_wait_end();
if (close(fd) != 0)
{
int save_errno = errno;
unlink(filename);
errno = save_errno;
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not write lock file \"%s\": %m", filename)));
}
/*
* Arrange to unlink the lock file(s) at proc_exit. If this is the first
* one, set up the on_proc_exit function to do it; then add this lock file
* to the list of files to unlink.
*/
if (lock_files == NIL)
on_proc_exit(UnlinkLockFiles, 0);
/*
* Use lcons so that the lock files are unlinked in reverse order of
* creation; this is critical!
*/
lock_files = lcons(pstrdup(filename), lock_files);
}
/*
* Create the data directory lockfile.
*
* When this is called, we must have already switched the working
* directory to DataDir, so we can just use a relative path. This
* helps ensure that we are locking the directory we should be.
*
* Note that the socket directory path line is initially written as empty.
* postmaster.c will rewrite it upon creating the first Unix socket.
*/
void
CreateDataDirLockFile(bool amPostmaster)
{
CreateLockFile(DIRECTORY_LOCK_FILE, amPostmaster, "", true, DataDir);
}
/*
* Create a lockfile for the specified Unix socket file.
*/
void
CreateSocketLockFile(const char *socketfile, bool amPostmaster,
const char *socketDir)
{
char lockfile[MAXPGPATH];
snprintf(lockfile, sizeof(lockfile), "%s.lock", socketfile);
CreateLockFile(lockfile, amPostmaster, socketDir, false, socketfile);
}
/*
* TouchSocketLockFiles -- mark socket lock files as recently accessed
*
* This routine should be called every so often to ensure that the socket
* lock files have a recent mod or access date. That saves them
* from being removed by overenthusiastic /tmp-directory-cleaner daemons.
* (Another reason we should never have put the socket file in /tmp...)
*/
void
TouchSocketLockFiles(void)
{
ListCell *l;
foreach(l, lock_files)
{
char *socketLockFile = (char *) lfirst(l);
/* No need to touch the data directory lock file, we trust */
if (strcmp(socketLockFile, DIRECTORY_LOCK_FILE) == 0)
continue;
/*
* utime() is POSIX standard, utimes() is a common alternative; if we
* have neither, fall back to actually reading the file (which only
* sets the access time not mod time, but that should be enough in
* most cases). In all paths, we ignore errors.
*/
#ifdef HAVE_UTIME
utime(socketLockFile, NULL);
#else /* !HAVE_UTIME */
#ifdef HAVE_UTIMES
utimes(socketLockFile, NULL);
#else /* !HAVE_UTIMES */
int fd;
char buffer[1];
fd = open(socketLockFile, O_RDONLY | PG_BINARY, 0);
if (fd >= 0)
{
read(fd, buffer, sizeof(buffer));
close(fd);
}
#endif /* HAVE_UTIMES */
#endif /* HAVE_UTIME */
}
}
/*
* Add (or replace) a line in the data directory lock file.
* The given string should not include a trailing newline.
*
* Note: because we don't truncate the file, if we were to rewrite a line
* with less data than it had before, there would be garbage after the last
* line. While we could fix that by adding a truncate call, that would make
* the file update non-atomic, which we'd rather avoid. Therefore, callers
* should endeavor never to shorten a line once it's been written.
*/
void
AddToDataDirLockFile(int target_line, const char *str)
{
int fd;
int len;
int lineno;
char *srcptr;
char *destptr;
char srcbuffer[BLCKSZ];
char destbuffer[BLCKSZ];
fd = open(DIRECTORY_LOCK_FILE, O_RDWR | PG_BINARY, 0);
if (fd < 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open file \"%s\": %m",
DIRECTORY_LOCK_FILE)));
return;
}
pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_ADDTODATADIR_READ);
len = read(fd, srcbuffer, sizeof(srcbuffer) - 1);
pgstat_report_wait_end();
if (len < 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not read from file \"%s\": %m",
DIRECTORY_LOCK_FILE)));
close(fd);
return;
}
srcbuffer[len] = '\0';
/*
* Advance over lines we are not supposed to rewrite, then copy them to
* destbuffer.
*/
srcptr = srcbuffer;
for (lineno = 1; lineno < target_line; lineno++)
{
char *eol = strchr(srcptr, '\n');
if (eol == NULL)
break; /* not enough lines in file yet */
srcptr = eol + 1;
}
memcpy(destbuffer, srcbuffer, srcptr - srcbuffer);
destptr = destbuffer + (srcptr - srcbuffer);
/*
* Fill in any missing lines before the target line, in case lines are
* added to the file out of order.
*/
for (; lineno < target_line; lineno++)
{
if (destptr < destbuffer + sizeof(destbuffer))
*destptr++ = '\n';
}
/*
* Write or rewrite the target line.
*/
snprintf(destptr, destbuffer + sizeof(destbuffer) - destptr, "%s\n", str);
destptr += strlen(destptr);
/*
* If there are more lines in the old file, append them to destbuffer.
*/
if ((srcptr = strchr(srcptr, '\n')) != NULL)
{
srcptr++;
snprintf(destptr, destbuffer + sizeof(destbuffer) - destptr, "%s",
srcptr);
}
/*
* And rewrite the data. Since we write in a single kernel call, this
* update should appear atomic to onlookers.
*/
len = strlen(destbuffer);
errno = 0;
pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_ADDTODATADIR_WRITE);
if (lseek(fd, (off_t) 0, SEEK_SET) != 0 ||
(int) write(fd, destbuffer, len) != len)
{
pgstat_report_wait_end();
/* if write didn't set errno, assume problem is no disk space */
if (errno == 0)
errno = ENOSPC;
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not write to file \"%s\": %m",
DIRECTORY_LOCK_FILE)));
close(fd);
return;
}
pgstat_report_wait_end();
pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_ADDTODATADIR_SYNC);
if (pg_fsync(fd) != 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not write to file \"%s\": %m",
DIRECTORY_LOCK_FILE)));
}
pgstat_report_wait_end();
if (close(fd) != 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not write to file \"%s\": %m",
DIRECTORY_LOCK_FILE)));
}
}
/*
* Recheck that the data directory lock file still exists with expected
* content. Return true if the lock file appears OK, false if it isn't.
*
* We call this periodically in the postmaster. The idea is that if the
* lock file has been removed or replaced by another postmaster, we should
* do a panic database shutdown. Therefore, we should return true if there
* is any doubt: we do not want to cause a panic shutdown unnecessarily.
* Transient failures like EINTR or ENFILE should not cause us to fail.
* (If there really is something wrong, we'll detect it on a future recheck.)
*/
bool
RecheckDataDirLockFile(void)
{
int fd;
int len;
long file_pid;
char buffer[BLCKSZ];
fd = open(DIRECTORY_LOCK_FILE, O_RDWR | PG_BINARY, 0);
if (fd < 0)
{
/*
* There are many foreseeable false-positive error conditions. For
* safety, fail only on enumerated clearly-something-is-wrong
* conditions.
*/
switch (errno)
{
case ENOENT:
case ENOTDIR:
/* disaster */
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open file \"%s\": %m",
DIRECTORY_LOCK_FILE)));
return false;
default:
/* non-fatal, at least for now */
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open file \"%s\": %m; continuing anyway",
DIRECTORY_LOCK_FILE)));
return true;
}
}
pgstat_report_wait_start(WAIT_EVENT_LOCK_FILE_RECHECKDATADIR_READ);
len = read(fd, buffer, sizeof(buffer) - 1);
pgstat_report_wait_end();
if (len < 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not read from file \"%s\": %m",
DIRECTORY_LOCK_FILE)));
close(fd);
return true; /* treat read failure as nonfatal */
}
buffer[len] = '\0';
close(fd);
file_pid = atol(buffer);
if (file_pid == getpid())
return true; /* all is well */
/* Trouble: someone's overwritten the lock file */
ereport(LOG,
(errmsg("lock file \"%s\" contains wrong PID: %ld instead of %ld",
DIRECTORY_LOCK_FILE, file_pid, (long) getpid())));
return false;
}
/*-------------------------------------------------------------------------
* Version checking support
*-------------------------------------------------------------------------
*/
/*
* Determine whether the PG_VERSION file in directory `path' indicates
* a data version compatible with the version of this program.
*
* If compatible, return. Otherwise, ereport(FATAL).
*/
void
ValidatePgVersion(const char *path)
{
char full_path[MAXPGPATH];
FILE *file;
int ret;
long file_major;
long my_major;
char *endptr;
char file_version_string[64];
const char *my_version_string = PG_VERSION;
my_major = strtol(my_version_string, &endptr, 10);
snprintf(full_path, sizeof(full_path), "%s/PG_VERSION", path);
file = AllocateFile(full_path, "r");
if (!file)
{
if (errno == ENOENT)
ereport(FATAL,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("\"%s\" is not a valid data directory",
path),
errdetail("File \"%s\" is missing.", full_path)));
else
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not open file \"%s\": %m", full_path)));
}
file_version_string[0] = '\0';
ret = fscanf(file, "%63s", file_version_string);
file_major = strtol(file_version_string, &endptr, 10);
if (ret != 1 || endptr == file_version_string)
ereport(FATAL,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("\"%s\" is not a valid data directory",
path),
errdetail("File \"%s\" does not contain valid data.",
full_path),
errhint("You might need to run gprecoversegment.sh")));
FreeFile(file);
if (my_major != file_major)
ereport(FATAL,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("database files are incompatible with server"),
errdetail("The data directory was initialized by PostgreSQL version %s, "
"which is not compatible with this version %s.",
file_version_string, my_version_string)));
}
/*-------------------------------------------------------------------------
* Library preload support
*-------------------------------------------------------------------------
*/
/*
* GUC variables: lists of library names to be preloaded at postmaster
* start and at backend start
*/
char *session_preload_libraries_string = NULL;
char *shared_preload_libraries_string = NULL;
char *local_preload_libraries_string = NULL;
/* Flag telling that we are loading shared_preload_libraries */
bool process_shared_preload_libraries_in_progress = false;
/*
* load the shared libraries listed in 'libraries'
*
* 'gucname': name of GUC variable, for error reports
* 'restricted': if true, force libraries to be in $libdir/plugins/
*/
static void
load_libraries(const char *libraries, const char *gucname, bool restricted)
{
char *rawstring;
List *elemlist;
ListCell *l;
if (libraries == NULL || libraries[0] == '\0')
return; /* nothing to do */
/* Need a modifiable copy of string */
rawstring = pstrdup(libraries);
/* Parse string into list of filename paths */
if (!SplitDirectoriesString(rawstring, ',', &elemlist))
{
/* syntax error in list */
list_free_deep(elemlist);
pfree(rawstring);
ereport(LOG,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid list syntax in parameter \"%s\"",
gucname)));
return;
}
foreach(l, elemlist)
{
/* Note that filename was already canonicalized */
char *filename = (char *) lfirst(l);
char *expanded = NULL;
/* If restricting, insert $libdir/plugins if not mentioned already */
if (restricted && first_dir_separator(filename) == NULL)
{
expanded = psprintf("$libdir/plugins/%s", filename);
filename = expanded;
}
load_file(filename, restricted);
ereport(DEBUG1,
(errmsg("loaded library \"%s\"", filename)));
if (expanded)
pfree(expanded);
}
list_free_deep(elemlist);
pfree(rawstring);
}
/*
* process any libraries that should be preloaded at postmaster start
*/
void
process_shared_preload_libraries(void)
{
process_shared_preload_libraries_in_progress = true;
load_libraries(shared_preload_libraries_string,
"shared_preload_libraries",
false);
process_shared_preload_libraries_in_progress = false;
}
/*
* process any libraries that should be preloaded at backend start
*/
void
process_session_preload_libraries(void)
{
load_libraries(session_preload_libraries_string,
"session_preload_libraries",
false);
load_libraries(local_preload_libraries_string,
"local_preload_libraries",
true);
}
void
pg_bindtextdomain(const char *domain)
{
#ifdef ENABLE_NLS
if (my_exec_path[0] != '\0')
{
char locale_path[MAXPGPATH];
get_locale_path(my_exec_path, locale_path);
bindtextdomain(domain, locale_path);
pg_bind_textdomain_codeset(domain);
}
#endif
}
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