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Get rid of not-very-portable fcntl(F_SETLK) mechanism for locking the Unix

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socket file, in favor of having an ordinary lockfile beside the socket file.
Clean up a few robustness problems in the lockfile code.  If postmaster is
going to reject a connection request based on database state, it will now
tell you so before authentication exchange not after.  (Of course, a failure
after is still possible if conditions change meanwhile, but this makes life
easier for a yet-to-be-written pg_ping utility.)
This commit is contained in:
Tom Lane
2000-11-29 20:59:54 +00:00
parent 1efd7330cb
commit 792b0f4666
10 changed files with 498 additions and 566 deletions
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17
src/include/miscadmin.h
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: miscadmin.h,v 1.74 2000/11/25 22:34:13 momjian Exp $
* $Id: miscadmin.h,v 1.75 2000/11/29 20:59:54 tgl Exp $
*
* NOTES
* some of the information in this file will be moved to
@ -114,7 +114,7 @@ extern int PostPortNumber;
extern int Unix_socket_permissions;
extern char *Unix_socket_group;
extern char *UnixSocketDir;
extern char *Virtual_host;
extern char *VirtualHost;
/*****************************************************************************
@ -227,17 +227,8 @@ extern bool IsIgnoringSystemIndexes(void);
extern bool IsCacheInitialized(void);
extern void SetWaitingForLock(bool);
/*
* "postmaster.pid" is a file containing postmaster's pid, being
* created uder $PGDATA upon postmaster's starting up. When postmaster
* shuts down, it will be unlinked.
*/
#define PIDFNAME "postmaster.pid"
extern void SetPidFname(char *datadir);
extern void UnlinkPidFile(void);
extern int SetPidFile(pid_t pid);
extern bool CreateDataDirLockFile(const char *datadir, bool amPostmaster);
extern bool CreateSocketLockFile(const char *socketfile, bool amPostmaster);
extern void ValidatePgVersion(const char *path);