Home | History | Annotate | Line # | Download | only in gen
initgroups.c revision 1.20 
      1 /*	$NetBSD: initgroups.c,v 1.20 2003/01/19 18:26:16 dsl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)initgroups.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: initgroups.c,v 1.20 2003/01/19 18:26:16 dsl Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <sys/param.h>
     47 
     48 #include <assert.h>
     49 #include <stdio.h>
     50 #include <unistd.h>
     51 #include <stdlib.h>
     52 #include <errno.h>
     53 
     54 #ifdef __weak_alias
     55 __weak_alias(initgroups,_initgroups)
     56 #endif
     57 
     58 int
     59 initgroups(uname, agroup)
     60 	const char *uname;
     61 	gid_t agroup;
     62 {
     63 	gid_t groups_list[NGROUPS];
     64 	int ngroups;
     65 	gid_t *groups = groups_list;
     66 	int rval;
     67 
     68 	_DIAGASSERT(uname != NULL);
     69 
     70 	ngroups = NGROUPS;
     71 	if (getgrouplist(uname, agroup, groups, &ngroups) == -1) {
     72 		int maxgroups = ngroups;
     73 		groups = calloc((size_t)maxgroups, sizeof *groups);
     74 		if (groups == NULL)
     75 			return -1;
     76 		if (getgrouplist(uname, agroup, groups, &ngroups) == -1)
     77 			ngroups = maxgroups;
     78 	}
     79 	rval = setgroups(ngroups, groups);
     80 	if (rval == -1 && errno == EINVAL) {
     81 		int ng = (int)sysconf(_SC_NGROUPS_MAX);
     82 		if (ng > 0 && ng < ngroups)
     83 			rval = setgroups(ng, groups);
     84 	}
     85 	if (groups != groups_list)
     86 		free(groups);
     87 	return rval;
     88 }
     89