getgroups.c

   1 /*
   2  * Copyright (C) 2002 by Martin Pool
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program 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
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /**
  20  * @file getgroups.c
  21  *
  22  * Print out the gids of all groups for the current user.  This is
  23  * like `id -G` on Linux, but it's too hard to find a portable
  24  * equivalent.
  25  **/
  26
  27 #include "rsync.h"
  28
  29 #ifndef NGROUPS
  30 /* It ought to be defined, but just in case. */
  31 #  define NGROUPS 32
  32 #endif
  33
  34 int main(int argc, char *argv[])
  35 {
  36         int n, i;
  37         gid_t list[NGROUPS];
  38
  39         if ((n = getgroups(NGROUPS, list)) == -1) {
  40                 perror("getgroups");
  41                 return 1;
  42         }
  43
  44         for (i = 0; i < n; i++)
  45                 printf("%u ", list[i]);
  46         printf("\n");
  47
  48         return 0;
  49 }