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

   1 /* Copyright (C) 1998, 2000, 2002 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_getresgid
  32
  33 extern int __syscall_getresgid (__kernel_gid_t *__unbounded rgid,
  34                                 __kernel_gid_t *__unbounded egid,
  35                                 __kernel_gid_t *__unbounded sgid);
  36
  37 # ifdef __NR_getresgid32
  38 extern int __syscall_getresgid32 (__kernel_gid32_t *__unbounded rgid,
  39                                   __kernel_gid32_t *__unbounded egid,
  40                                   __kernel_gid32_t *__unbounded sgid);
  41
  42 #  if __ASSUME_32BITUIDS == 0
  43 /* This variable is shared with all files that need to check for 32bit
  44    uids.  */
  45 extern int __libc_missing_32bit_uids;
  46 #  endif
  47 # endif /* __NR_getresgid32 */
  48
  49
  50 int
  51 __getresgid (gid_t *rgid, gid_t *egid, gid_t *sgid)
  52 {
  53 # if __ASSUME_32BITUIDS > 0
  54   return INLINE_SYSCALL (getresgid32, 3, CHECK_1 (rgid),
  55                          CHECK_1 (egid), CHECK_1 (sgid));
  56 # else
  57   __kernel_gid_t k_rgid, k_egid, k_sgid;
  58   int result;
  59 #  ifdef __NR_getresgid32
  60   if (__libc_missing_32bit_uids <= 0)
  61     {
  62       int r;
  63       int saved_errno = errno;
  64
  65       r = INLINE_SYSCALL (getresgid32, 3, CHECK_1 (rgid),
  66                           CHECK_1 (egid), CHECK_1 (sgid));
  67       if (r == 0 || errno != ENOSYS)
  68         return r;
  69
  70       __set_errno (saved_errno);
  71       __libc_missing_32bit_uids = 1;
  72     }
  73 #  endif /* __NR_getresgid32 */
  74
  75   result = INLINE_SYSCALL (getresgid, 3, __ptrvalue (&k_rgid),
  76                            __ptrvalue (&k_egid), __ptrvalue (&k_sgid));
  77
  78   if (result == 0)
  79     {
  80       *rgid = (gid_t) k_rgid;
  81       *egid = (gid_t) k_egid;
  82       *sgid = (gid_t) k_sgid;
  83     }
  84
  85   return result;
  86 # endif
  87 }
  88 libc_hidden_def (__getresgid)
  89 weak_alias (__getresgid, getresgid)
  90
  91 #else
  92 # include <sysdeps/generic/getresgid.c>
  93 #endif