xref: /netbsd/lib/libc/gen/initgroups.c (revision 6550d01e)
1 /*	$NetBSD: initgroups.c,v 1.21 2003/08/07 16:42:51 agc 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. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)initgroups.c	8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: initgroups.c,v 1.21 2003/08/07 16:42:51 agc Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40 
41 #include "namespace.h"
42 #include <sys/param.h>
43 
44 #include <assert.h>
45 #include <stdio.h>
46 #include <unistd.h>
47 #include <stdlib.h>
48 #include <errno.h>
49 
50 #ifdef __weak_alias
51 __weak_alias(initgroups,_initgroups)
52 #endif
53 
54 int
55 initgroups(uname, agroup)
56 	const char *uname;
57 	gid_t agroup;
58 {
59 	gid_t groups_list[NGROUPS];
60 	int ngroups;
61 	gid_t *groups = groups_list;
62 	int rval;
63 
64 	_DIAGASSERT(uname != NULL);
65 
66 	ngroups = NGROUPS;
67 	if (getgrouplist(uname, agroup, groups, &ngroups) == -1) {
68 		int maxgroups = ngroups;
69 		groups = calloc((size_t)maxgroups, sizeof *groups);
70 		if (groups == NULL)
71 			return -1;
72 		if (getgrouplist(uname, agroup, groups, &ngroups) == -1)
73 			ngroups = maxgroups;
74 	}
75 	rval = setgroups(ngroups, groups);
76 	if (rval == -1 && errno == EINVAL) {
77 		int ng = (int)sysconf(_SC_NGROUPS_MAX);
78 		if (ng > 0 && ng < ngroups)
79 			rval = setgroups(ng, groups);
80 	}
81 	if (groups != groups_list)
82 		free(groups);
83 	return rval;
84 }
85