* movemail.c (main): Use setregid, as setegid is missing on HP-UX (Bug#6811).

Suggested by Peter O'Gorman.

lib-src/ChangeLog

+2011-01-23  Chong Yidong  <cyd@stupidchicken.com>
+
+	* movemail.c (main): Use setregid instead of setegid, which is
+	missing on older systems.  Suggested by Peter O'Gorman (Bug#6811).
+
 2011-01-02  Glenn Morris  <rgm@gnu.org>
 
 	* ebrowse.c (version) <emacs_copyright>:

lib-src/movemail.c

@@ -360,7 +360,7 @@ main (argc, argv)
       time_t touched_lock, now;
 #endif
 
-      if (setuid (getuid ()) < 0 || setegid (real_gid) < 0)
+      if (setuid (getuid ()) < 0 || setregid (-1, real_gid) < 0)
 	fatal ("Failed to drop privileges", 0, 0);
 
 #ifndef MAIL_USE_MMDF
@@ -387,7 +387,7 @@ main (argc, argv)
       if (outdesc < 0)
 	pfatal_with_name (outname);
 
-      if (setegid (priv_gid) < 0)
+      if (setregid (-1, priv_gid) < 0)
 	fatal ("Failed to regain privileges", 0, 0);
 
       /* This label exists so we can retry locking
@@ -484,7 +484,7 @@ main (argc, argv)
 #endif
 
       /* Prevent symlink attacks truncating other users' mailboxes */
-      if (setegid (real_gid) < 0)
+      if (setregid (-1, real_gid) < 0)
 	fatal ("Failed to drop privileges", 0, 0);
 
       /* Check to make sure no errors before we zap the inbox.  */
@@ -519,7 +519,7 @@ main (argc, argv)
 #endif /* not MAIL_USE_SYSTEM_LOCK */
 
       /* End of mailbox truncation */
-      if (setegid (priv_gid) < 0)
+      if (setregid (-1, priv_gid) < 0)
 	fatal ("Failed to regain privileges", 0, 0);
 
 #ifdef MAIL_USE_MAILLOCK