compilers/linux86-0.16.17/libc/getent/getgrgid.c

   1 /*
   2  * getgrgid.c - This file is part of the libc-8086/grp package for ELKS,
   3  * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Library General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Library General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Library General Public
  16  *  License along with this library; if not, write to the Free
  17  *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21 #include <sys/types.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <grp.h>
  25
  26 struct group *
  27 getgrgid(const gid_t gid)
  28 {
  29   struct group * group;
  30   int grp_fd;
  31
  32   if ((grp_fd=open("/etc/group", O_RDONLY))<0)
  33     return NULL;
  34
  35   while ((group=__getgrent(grp_fd))!=NULL)
  36     if (group->gr_gid==gid)
  37       {
  38         close(grp_fd);
  39         return group;
  40       }
  41
  42   close(grp_fd);
  43   return NULL;
  44 }
  45
  46
  47
  48