Use get_progname() in backend main.c, rather than port-specific hack

that is too fragile.

src/backend/main/main.c

@@ -13,7 +13,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/main/main.c,v 1.94 2004/12/31 21:59:53 pgsql Exp $
+ *	  $PostgreSQL: pgsql/src/backend/main/main.c,v 1.95 2005/10/13 15:37:14 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -50,8 +50,6 @@
 int
 main(int argc, char *argv[])
 {
-	int			len;
-
 #ifndef WIN32
 	struct passwd *pw;
 #endif
@@ -256,13 +254,7 @@ main(int argc, char *argv[])
 	 * (and possibly first argument) we were called with. The lack of
 	 * consistency here is historical.
 	 */
-	len = strlen(argv[0]);
-
-	if ((len >= 10 && strcmp(argv[0] + len - 10, "postmaster") == 0)
-#ifdef WIN32
-	  || (len >= 14 && strcmp(argv[0] + len - 14, "postmaster.exe") == 0)
-#endif
-		)
+	if (strcmp(get_progname(argv[0]), "postmaster") == 0)
 	{
 		/* Called as "postmaster" */
 		exit(PostmasterMain(argc, argv));

src/port/path.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/port/path.c,v 1.59 2005/09/27 17:39:35 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/port/path.c,v 1.60 2005/10/13 15:37:14 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -403,7 +403,7 @@ get_progname(const char *argv0)
 	{
 		char *progname;
 
-		progname = strdup(nodir_name);
+		progname = strdup(nodir_name);	/* leaks memory, but called only once */
 		if (progname == NULL)
 		{
 			fprintf(stderr, "%s: out of memory\n", nodir_name);