xref: /illumos-gate/usr/src/lib/libc/port/sys/execl.c (revision 59f081ed)
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*/
47 int
execl(const char * name,const char * arg0,...)48 execl(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