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getgrouplist.c revision 1.21 
      1 /*	$NetBSD: getgrouplist.c,v 1.21 2005/01/06 15:10:45 lukem Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004-2005 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Luke Mewburn.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char sccsid[] = "@(#)getgrouplist.c	8.2 (Berkeley) 12/8/94";
     43 #else
     44 __RCSID("$NetBSD: getgrouplist.c,v 1.21 2005/01/06 15:10:45 lukem Exp $");
     45 #endif
     46 #endif /* LIBC_SCCS and not lint */
     47 
     48 /*
     49  * calculate group access list
     50  */
     51 
     52 #include "namespace.h"
     53 #include <sys/param.h>
     54 
     55 #include <assert.h>
     56 #include <nsswitch.h>
     57 #include <stdarg.h>
     58 #include <unistd.h>
     59 
     60 #ifdef __weak_alias
     61 __weak_alias(getgrouplist,_getgrouplist)
     62 #endif
     63 
     64 int
     65 getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
     66 {
     67 	int	rv, groupc;
     68 
     69 	_DIAGASSERT(uname != NULL);
     70 	/* groups may be NULL if just sizing when invoked with *grpcnt = 0 */
     71 	_DIAGASSERT(grpcnt != NULL);
     72 
     73 	groupc = 0;
     74 	rv = getgroupmembership(uname, agroup, groups, *grpcnt, &groupc);
     75 	*grpcnt = groupc;	/* set groupc to the actual # of groups */
     76 	return rv;
     77 }
     78