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[/] [or1k/] [tags/] [initial/] [uclinux/] [uC-libc/] [getent/] [initgroups.c] - Rev 1765
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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); }