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 /*
31 * execl(name, arg0, arg1, ..., argn, 0)
32 * environment automatically passed.
33 */
34
35 #pragma weak _execl = execl
36
37 #include "lint.h"
38 #include <alloca.h>
39 #include <malloc.h>
40 #include <stdarg.h>
41 #include <sys/types.h>
42 #include <unistd.h>
43
44 /*VARARGS1*/
45 int
execl(const char * name,const char * arg0,...)46 execl(const char *name, const char *arg0, ...)
47 {
48 char **argp;
49 va_list args;
50 char **argvec;
51 extern char **_environ;
52 int err;
53 int nargs = 0;
54 char *nextarg;
55
56 /*
57 * count the number of arguments in the variable argument list
58 * and allocate an argument vector for them on the stack,
59 * adding an extra element for a terminating null pointer
60 */
61
62 va_start(args, arg0);
63 while (va_arg(args, char *) != (char *)0) {
64 nargs++;
65 }
66 va_end(args);
67
68 /*
69 * load the arguments in the variable argument list
70 * into the argument vector and add the terminating null pointer
71 */
72
73 va_start(args, arg0);
74
75 /* workaround for bugid 1242839 */
76 argvec = (char **)alloca((size_t)((nargs + 2) * sizeof (char *)));
77 argp = argvec;
78 *argp++ = (char *)arg0;
79 while ((nextarg = va_arg(args, char *)) != (char *)0) {
80 *argp++ = nextarg;
81 }
82 va_end(args);
83 *argp = (char *)0;
84
85 /*
86 * call execve()
87 */
88
89 err = execve(name, argvec, _environ);
90 return (err);
91 }
92