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      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
     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