Index: src/backend/postmaster/postmaster.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/postmaster/postmaster.c,v
retrieving revision 1.476
diff -u -r1.476 postmaster.c
--- src/backend/postmaster/postmaster.c	22 Nov 2005 18:17:18 -0000	1.476
+++ src/backend/postmaster/postmaster.c	10 Dec 2005 18:28:04 -0000
@@ -254,6 +254,7 @@
 static void ConnFree(Port *port);
 static void reset_shared(int port);
 static void SIGHUP_handler(SIGNAL_ARGS);
+static void RunAtexitScriptFile(const char *);
 static void pmdie(SIGNAL_ARGS);
 static void reaper(SIGNAL_ARGS);
 static void sigusr1_handler(SIGNAL_ARGS);
@@ -1856,6 +1858,21 @@
 	errno = save_errno;
 }
 
+/*
+ * RunAtexitScriptFile -- run configured atexit script.
+ */
+static void
+RunAtexitScriptFile(const char *shuttype)
+{
+	if (enable_atexit_script_file && atexit_script_file)
+	{
+		int		l = strlen(atexit_script_file) + strlen(shuttype) + 2;
+		char	buf[l];
+
+		sprintf(buf, "%s %s", atexit_script_file, shuttype);
+		system(buf);
+	}
+}
 
 /*
  * pmdie -- signal handler for processing various postmaster signals.
@@ -1885,6 +1902,7 @@
 			Shutdown = SmartShutdown;
 			ereport(LOG,
 					(errmsg("received smart shutdown request")));
+			RunAtexitScriptFile("smart");
 
 			/*
 			 * We won't wait out an autovacuum iteration ...
@@ -1931,6 +1949,7 @@
 			Shutdown = FastShutdown;
 			ereport(LOG,
 					(errmsg("received fast shutdown request")));
+			RunAtexitScriptFile("fast");
 
 			if (DLGetHead(BackendList) || AutoVacPID != 0)
 			{
@@ -1978,6 +1997,8 @@
 			 */
 			ereport(LOG,
 					(errmsg("received immediate shutdown request")));
+			RunAtexitScriptFile("immediate");
+			
 			if (StartupPID != 0)
 				kill(StartupPID, SIGQUIT);
 			if (BgWriterPID != 0)
Index: src/backend/utils/misc/guc.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/utils/misc/guc.c,v
retrieving revision 1.301
diff -u -r1.301 guc.c
--- src/backend/utils/misc/guc.c	22 Nov 2005 18:17:26 -0000	1.301
+++ src/backend/utils/misc/guc.c	10 Dec 2005 18:28:24 -0000
@@ -145,6 +145,7 @@
 /*
  * GUC option variables that are exported from this module
  */
+bool		enable_atexit_script_file = false;
 #ifdef USE_ASSERT_CHECKING
 bool		assert_enabled = true;
 #endif
@@ -181,6 +182,7 @@
 char	   *HbaFileName;
 char	   *IdentFileName;
 char	   *external_pid_file;
+char	   *atexit_script_file;
 
 int			tcp_keepalives_idle;
 int			tcp_keepalives_interval;
@@ -391,6 +393,14 @@
 static struct config_bool ConfigureNamesBool[] =
 {
 	{
+		{"enable_atexit_script_file", PGC_POSTMASTER, FILE_LOCATIONS,
+			gettext_noop("Enables usage of atexit script file on postmaster shutdown."),
+			NULL
+		},
+		&enable_atexit_script_file,
+		false, NULL, NULL
+	},
+	{
 		{"enable_seqscan", PGC_USERSET, QUERY_TUNING_METHOD,
 			gettext_noop("Enables the planner's use of sequential-scan plans."),
 			NULL
@@ -2119,6 +2129,16 @@
 		NULL, assign_canonical_path, NULL
 	},
 
+	{
+		{"atexit_script_file", PGC_POSTMASTER, FILE_LOCATIONS,
+			gettext_noop("Executes specified atexit script file on database shutdown."),
+			NULL,
+			GUC_SUPERUSER_ONLY
+		},
+		&atexit_script_file,
+		NULL, assign_canonical_path, NULL
+	},
+
 	/* End-of-list marker */
 	{
 		{NULL, 0, 0, NULL, NULL}, NULL, NULL, NULL, NULL
@@ -2856,6 +2876,47 @@
 
 	free(configdir);
 
+	/*
+	 * Access permission check for atexit_script_file.
+	 */
+	if (enable_atexit_script_file)
+	{
+		int xmask;
+		
+		if (!atexit_script_file)
+		{
+			write_stderr("You must specify an atexit script file when you "
+						 "enabled its usage.\n");
+			return false;
+		}
+		else if (stat(atexit_script_file, &stat_buf) != 0)
+		{
+			write_stderr("%s cannot access atexit script file to run on server "
+						 "shutdown.\n\"%s\": %s\n",
+						 progname, atexit_script_file, strerror(errno));
+			return false;
+		}
+
+		/*
+		 * FIXME: Below execution masks require editing
+		 * (like S_IXROOT) for some platforms (like Netware).
+		 */
+		if (stat_buf.st_uid == getuid())
+			xmask = S_IXUSR;
+		else if (stat_buf.st_uid == getgid())
+			xmask = S_IXGRP;
+		else
+			xmask = S_IXOTH;
+
+		if ((stat_buf.st_mode&xmask) == 0 || S_ISDIR(stat_buf.st_mode))
+		{
+			write_stderr("%s doesn't have execution permissions on script "
+						 "file to run on server shutdown.\n\"%s\": %s\n",
+						 progname, atexit_script_file, strerror(errno));
+			return false;
+		}
+	}
+
 	return true;
 }
 
Index: src/backend/utils/misc/postgresql.conf.sample
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/utils/misc/postgresql.conf.sample,v
retrieving revision 1.171
diff -u -r1.171 postgresql.conf.sample
--- src/backend/utils/misc/postgresql.conf.sample	17 Nov 2005 22:14:54 -0000	1.171
+++ src/backend/utils/misc/postgresql.conf.sample	10 Dec 2005 18:28:25 -0000
@@ -39,6 +39,9 @@
 # If external_pid_file is not explicitly set, no extra pid file is written.
 #external_pid_file = '(none)'		# write an extra pid file
 
+# atexit script file to run on database shutdown.
+#enable_atexit_script_file = off
+#atexit_script_file = '(none)'
 
 #---------------------------------------------------------------------------
 # CONNECTIONS AND AUTHENTICATION
Index: src/include/utils/guc.h
===================================================================
RCS file: /projects/cvsroot/pgsql/src/include/utils/guc.h,v
retrieving revision 1.63
diff -u -r1.63 guc.h
--- src/include/utils/guc.h	15 Oct 2005 02:49:46 -0000	1.63
+++ src/include/utils/guc.h	10 Dec 2005 19:14:00 -0000
@@ -103,6 +103,7 @@
 #define GUC_QUALIFIER_SEPARATOR '.'
 
 /* GUC vars that are actually declared in guc.c, rather than elsewhere */
+extern bool enable_atexit_script_file;
 extern bool log_duration;
 extern bool Debug_print_plan;
 extern bool Debug_print_parse;
@@ -133,6 +134,7 @@
 extern char *HbaFileName;
 extern char *IdentFileName;
 extern char *external_pid_file;
+extern char *atexit_script_file;
 
 extern int	tcp_keepalives_idle;
 extern int	tcp_keepalives_interval;