dev86/libc/getent/getgrgid.c

/*
 * getgrgid.c - This file is part of the libc-8086/grp package for ELKS,
 * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
 * 
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <grp.h>

struct group *
getgrgid(const gid_t gid)
{
  struct group * group;
  int grp_fd;

  if ((grp_fd=open("/etc/group", O_RDONLY))<0)
    return NULL;

  while ((group=__getgrent(grp_fd))!=NULL)
    if (group->gr_gid==gid)
      {
	close(grp_fd);
	return group;
      }

  close(grp_fd);
  return NULL;
}