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

   1 /* Copyright (C) 1998,2000,2002,2003,2005,2006 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 #include <sys/types.h>
  22
  23 #include <linux/posix_types.h>
  24
  25 #include <sysdep.h>
  26 #include <sys/syscall.h>
  27 #include <bp-checks.h>
  28
  29 #include <kernel-features.h>
  30
  31 #ifdef __NR_getresuid
  32
  33 # ifdef __NR_getresuid32
  34 #  if __ASSUME_32BITUIDS == 0
  35 /* This variable is shared with all files that need to check for 32bit
  36    uids.  */
  37 extern int __libc_missing_32bit_uids;
  38 #  endif
  39 # endif /* __NR_getresuid32 */
  40
  41 int
  42 __getresuid (uid_t *ruid, uid_t *euid, uid_t *suid)
  43 {
  44 # if __ASSUME_32BITUIDS > 0
  45   return INLINE_SYSCALL (getresuid32, 3, CHECK_1 (ruid),
  46                          CHECK_1 (euid), CHECK_1 (suid));
  47 # else
  48   __kernel_uid_t k_ruid, k_euid, k_suid;
  49   int result;
  50 #  ifdef __NR_getresuid32
  51   if (__libc_missing_32bit_uids <= 0)
  52     {
  53       int r;
  54       int saved_errno = errno;
  55
  56       r = INLINE_SYSCALL (getresuid32, 3, CHECK_1 (ruid),
  57                           CHECK_1 (euid), CHECK_1 (suid));
  58       if (r == 0 || errno != ENOSYS)
  59         return r;
  60
  61       __set_errno (saved_errno);
  62       __libc_missing_32bit_uids = 1;
  63     }
  64 #  endif /* __NR_getresuid32 */
  65
  66   result = INLINE_SYSCALL (getresuid, 3, __ptrvalue (&k_ruid),
  67                            __ptrvalue (&k_euid), __ptrvalue (&k_suid));
  68
  69   if (result == 0)
  70     {
  71       *ruid = (uid_t) k_ruid;
  72       *euid = (uid_t) k_euid;
  73       *suid = (uid_t) k_suid;
  74     }
  75
  76   return result;
  77 # endif
  78 }
  79 libc_hidden_def (__getresuid)
  80 weak_alias (__getresuid, getresuid)
  81
  82 #else
  83 # include <posix/getresuid.c>
  84 #endif