sysdeps/unix/sysv/linux/setgid.c

   1 /* Copyright (C) 1998, 2000, 2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21 #include <sys/types.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 #include <linux/posix_types.h>
  27 #include "kernel-features.h"
  28 #include <pthread-functions.h>
  29
  30
  31
  32 int
  33 __setgid (gid_t gid)
  34 {
  35   int result;
  36
  37   result = INLINE_SYSCALL (setgid, 1, gid);
  38
  39 #if defined HAVE_PTR__NPTL_SETXID && !defined SINGLE_THREAD
  40   if (result == 0 && __libc_pthread_functions.ptr__nptl_setxid != NULL)
  41     {
  42       struct xid_command cmd;
  43       cmd.syscall_no = __NR_setgid;
  44       cmd.id[0] = gid;
  45       __libc_pthread_functions.ptr__nptl_setxid (&cmd);
  46     }
  47 #endif
  48
  49   return result;
  50 }
  51 #ifndef __setgid
  52 weak_alias (__setgid, setgid)
  53 #endif