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/*
* initgroups.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 <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <grp.h>
#include "config.h"
int
initgroups(__const char * user, gid_t gid)
{
register struct group * group;
#ifndef GR_DYNAMIC_GROUP_LIST
gid_t group_list[GR_MAX_GROUPS];
#else
gid_t * group_list=NULL;
#endif
register char ** tmp_mem;
int num_groups;
int grp_fd;
if ((grp_fd=open("/etc/group", O_RDONLY))<0)
return -1;
num_groups=0;
#ifdef GR_DYNAMIC_GROUP_LIST
group_list=(gid_t *) realloc(group_list, 1);
#endif
group_list[num_groups]=gid;
#ifndef GR_DYNAMIC_GROUP_LIST
while (num_groups<GR_MAX_GROUPS &&
(group=__getgrent(grp_fd))!=NULL)
#else
while ((group=__getgrent(grp_fd))!=NULL)
#endif
{
if (group->gr_gid!=gid);
{
tmp_mem=group->gr_mem;
while(*tmp_mem!=NULL)
{
if (!strcmp(*tmp_mem, user))
{
num_groups++;
#ifdef GR_DYNAMIC_GROUP_LIST
group_list=(gid_t *)realloc(group_list,
num_groups*sizeof(gid_t *));
#endif
group_list[num_groups]=group->gr_gid;
}
tmp_mem++;
}
}
}
close(grp_fd);
return setgroups(num_groups, group_list);
}
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