1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32/*
33 *	execl(name, arg0, arg1, ..., argn, 0)
34 *	environment automatically passed.
35 */
36
37#pragma weak _execl = execl
38
39#include "lint.h"
40#include <alloca.h>
41#include <malloc.h>
42#include <stdarg.h>
43#include <sys/types.h>
44#include <unistd.h>
45
46/*VARARGS1*/
47int
48execl(const char *name, const char *arg0, ...)
49{
50	char **argp;
51	va_list args;
52	char **argvec;
53	extern char **_environ;
54	int err;
55	int nargs = 0;
56	char *nextarg;
57
58	/*
59	 * count the number of arguments in the variable argument list
60	 * and allocate an argument vector for them on the stack,
61	 * adding an extra element for a terminating null pointer
62	 */
63
64	va_start(args, arg0);
65	while (va_arg(args, char *) != (char *)0) {
66		nargs++;
67	}
68	va_end(args);
69
70	/*
71	 * load the arguments in the variable argument list
72	 * into the argument vector and add the terminating null pointer
73	 */
74
75	va_start(args, arg0);
76
77	/* workaround for bugid 1242839 */
78	argvec = (char **)alloca((size_t)((nargs + 2) * sizeof (char *)));
79	argp = argvec;
80	*argp++ = (char *)arg0;
81	while ((nextarg = va_arg(args, char *)) != (char *)0) {
82		*argp++ = nextarg;
83	}
84	va_end(args);
85	*argp = (char *)0;
86
87	/*
88	 * call execve()
89	 */
90
91	err = execve(name, argvec, _environ);
92	return (err);
93}
94