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/* vi: set sw=4 ts=4: */
/*
* initgroups.c - This file is part of the libc-8086/grp package for ELKS,
* Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
* Copyright (C) 2001-2003 Erik Andersen <andersee@debian.org>
*
* 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 <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <errno.h>
#include "config.h"
#ifdef __UCLIBC_HAS_THREADS__
#include <pthread.h>
static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
# define LOCK pthread_mutex_lock(&mylock)
# define UNLOCK pthread_mutex_unlock(&mylock);
#else
# define LOCK
# define UNLOCK
#endif
int initgroups(__const char *user, gid_t gid)
{
gid_t *group_list = NULL;
register char **tmp_mem;
int num_groups;
int grp_fd;
static struct group group;
static char line_buff[PWD_BUFFER_SIZE];
if ((grp_fd = open(_PATH_GROUP, O_RDONLY)) < 0)
return errno;
num_groups = 0;
group_list = (gid_t *) realloc(group_list, 1);
group_list[num_groups] = gid;
LOCK;
while (__getgrent_r(&group, line_buff, sizeof(line_buff), grp_fd) == 0)
{
if (group.gr_gid != gid)
{
tmp_mem = group.gr_mem;
while (*tmp_mem != NULL) {
if (!strcmp(*tmp_mem, user)) {
num_groups++;
group_list = (gid_t *) realloc(group_list, num_groups * sizeof(gid_t *));
group_list[num_groups-1] = group.gr_gid;
}
tmp_mem++;
}
}
}
close(grp_fd);
UNLOCK;
return setgroups(num_groups, group_list);
}
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