lib/libc/gen/getgrouplist.c

   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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)getgrouplist.c      8.2 (Berkeley) 12/8/94";
  36 #else
  37 __RCSID("$NetBSD: getgrouplist.c,v 1.21 2005/01/06 15:10:45 lukem Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 /*
  42  * calculate group access list
  43  */
  44
  45 #include "namespace.h"
  46 #include <sys/param.h>
  47
  48 #include <assert.h>
  49 #include <nsswitch.h>
  50 #include <stdarg.h>
  51 #include <unistd.h>
  52
  53 #ifdef __weak_alias
  54 __weak_alias(getgrouplist,_getgrouplist)
  55 #endif
  56
  57 int
  58 getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
  59 {
  60         int     rv, groupc;
  61
  62         _DIAGASSERT(uname != NULL);
  63         /* groups may be NULL if just sizing when invoked with *grpcnt = 0 */
  64         _DIAGASSERT(grpcnt != NULL);
  65
  66         groupc = 0;
  67         rv = getgroupmembership(uname, agroup, groups, *grpcnt, &groupc);
  68         *grpcnt = groupc;       /* set groupc to the actual # of groups */
  69         return rv;
  70 }