posix/getgroups.c

   1 /* Copyright (C) 1991-2023 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <unistd.h>
  21 #include <sys/types.h>
  22 #include <limits.h>
  23
  24
  25 /* If SIZE is zero, return the number of supplementary groups
  26    the calling process is in.  Otherwise, fill in the group IDs
  27    of its supplementary groups in LIST and return the number written.  */
  28 int
  29 __getgroups (int size, gid_t *list)
  30 {
  31 #if defined (NGROUPS_MAX) && NGROUPS_MAX == 0
  32   /* The system has no supplementary groups.  */
  33   return 0;
  34 #endif
  35
  36   __set_errno (ENOSYS);
  37   return -1;
  38 }
  39
  40 #if !(defined (NGROUPS_MAX) && NGROUPS_MAX == 0)
  41 stub_warning (getgroups);
  42 #endif
  43
  44 weak_alias (__getgroups, getgroups)