xref: /illumos-gate/usr/src/lib/libc/port/sys/execl.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
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