sysdeps/unix/sysv/linux/i386/getgid.c

   1 /* Copyright (C) 2000, 2003, 2006 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
  22 #include <sysdep.h>
  23 #include <sys/syscall.h>
  24
  25 #include <kernel-features.h>
  26
  27 #ifdef __NR_getgid32
  28 # if __ASSUME_32BITUIDS == 0
  29 /* This variable is shared with all files that need to check for 32bit
  30    uids.  */
  31 extern int __libc_missing_32bit_uids attribute_hidden;
  32 # endif
  33 #endif /* __NR_getgid32 */
  34
  35 gid_t
  36 __getgid (void)
  37 {
  38   INTERNAL_SYSCALL_DECL (err);
  39 #if __ASSUME_32BITUIDS > 0
  40   /* No error checking.  */
  41   return INTERNAL_SYSCALL (getgid32, err, 0);
  42 #else
  43 # ifdef __NR_getgid32
  44   if (__libc_missing_32bit_uids <= 0)
  45     {
  46       int result;
  47
  48       result = INTERNAL_SYSCALL (getgid32, err, 0);
  49       if (! INTERNAL_SYSCALL_ERROR_P (result, err)
  50           || INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS)
  51         return result;
  52
  53       __libc_missing_32bit_uids = 1;
  54     }
  55 # endif /* __NR_getgid32 */
  56
  57   /* No error checking.  */
  58   return INTERNAL_SYSCALL (getgid, err, 0);
  59 #endif
  60 }
  61
  62 weak_alias (__getgid, getgid)