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

   1 /* Copyright (C) 1997, 1998 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <grp.h>
  21 #include <unistd.h>
  22 #include <sys/types.h>
  23
  24 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26
  27 #include <linux/posix_types.h>
  28
  29 extern int __syscall_setgroups __P ((int, const __kernel_gid_t *));
  30
  31 /* Set the group set for the current user to GROUPS (N of them).  For
  32    Linux we must convert the array of groups into the format that the
  33    kernel expects.  */
  34 int
  35 setgroups (n, groups)
  36      size_t n;
  37      const gid_t *groups;
  38 {
  39   size_t i;
  40   __kernel_gid_t kernel_groups[n];
  41
  42   for (i = 0; i < n; i++)
  43     {
  44       kernel_groups[i] = groups[i];
  45       if (groups[i] != (gid_t) ((__kernel_gid_t) groups[i]))
  46         {
  47           __set_errno (EINVAL);
  48           return -1;
  49         }
  50     }
  51
  52   return INLINE_SYSCALL (setgroups, 2, n, kernel_groups);
  53 }