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Revision 1.21, Thu Jan 6 15:10:45 2005 UTC (14 years, 11 months ago) by lukem
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base, wrstuden-fixsa-newbase, wrstuden-fixsa-base-1, wrstuden-fixsa-base, wrstuden-fixsa, netbsd-4-base, netbsd-4-0-RELEASE, netbsd-4-0-RC5, netbsd-4-0-RC4, netbsd-4-0-RC3, netbsd-4-0-RC2, netbsd-4-0-RC1, netbsd-4-0-1-RELEASE, netbsd-4-0, netbsd-4, netbsd-3-base, netbsd-3-1-RELEASE, netbsd-3-1-RC4, netbsd-3-1-RC3, netbsd-3-1-RC2, netbsd-3-1-RC1, netbsd-3-1-1-RELEASE, netbsd-3-1, netbsd-3-0-RELEASE, netbsd-3-0-RC6, netbsd-3-0-RC5, netbsd-3-0-RC4, netbsd-3-0-RC3, netbsd-3-0-RC2, netbsd-3-0-RC1, netbsd-3-0-3-RELEASE, netbsd-3-0-2-RELEASE, netbsd-3-0-1-RELEASE, netbsd-3-0, netbsd-3, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, keiichi-mipv6-base, keiichi-mipv6, hpcarm-cleanup-base, hpcarm-cleanup, cube-autoconf-base, cube-autoconf, abandoned-netbsd-4-base, abandoned-netbsd-4
Branch point for: yamt-pf42
Changes since 1.20: +8 -170 lines

Implement getgroupmembership(3).  This is similar to getgrouplist(3), except
that the "int maxgroups" and "int *ngroups" parameters are separated into
two separate parameters which makes it possible to call multiple nsswitch
back-ends and have the results correctly merged.
getgrouplist(3) is now implemented using getgroupmembership(3).

Proposed on tech-userlevel on December 1, 2004.

/*	$NetBSD: getgrouplist.c,v 1.21 2005/01/06 15:10:45 lukem Exp $	*/

/*-
 * Copyright (c) 2004-2005 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getgrouplist.c	8.2 (Berkeley) 12/8/94";
#else
__RCSID("$NetBSD: getgrouplist.c,v 1.21 2005/01/06 15:10:45 lukem Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

/*
 * calculate group access list
 */

#include "namespace.h"
#include <sys/param.h>

#include <assert.h>
#include <nsswitch.h>
#include <stdarg.h>
#include <unistd.h>

#ifdef __weak_alias
__weak_alias(getgrouplist,_getgrouplist)
#endif

int
getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
{
	int	rv, groupc;

	_DIAGASSERT(uname != NULL);
	/* groups may be NULL if just sizing when invoked with *grpcnt = 0 */
	_DIAGASSERT(grpcnt != NULL);

	groupc = 0;
	rv = getgroupmembership(uname, agroup, groups, *grpcnt, &groupc);
	*grpcnt = groupc;	/* set groupc to the actual # of groups */
	return rv;
}