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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  *	execle(file, arg1, arg2, ..., 0, envp)
     34  */
     35 
     36 #pragma weak _execle = execle
     37 
     38 #include "lint.h"
     39 #include <sys/types.h>
     40 #include <alloca.h>
     41 #include <malloc.h>
     42 #include <stdarg.h>
     43 #include <unistd.h>
     44 
     45 /*VARARGS1*/
     46 int
     47 execle(const char *file, const char *arg0, ...)
     48 {
     49 	char **argp;
     50 	va_list args;
     51 	char **argvec;
     52 	register  char  **environmentp;
     53 	int err;
     54 	int nargs = 0;
     55 	char *nextarg;
     56 
     57 	/*
     58 	 * count the number of arguments in the variable argument list
     59 	 * and allocate an argument vector for them on the stack,
     60 	 * adding space at the end for a terminating null pointer
     61 	 */
     62 
     63 	va_start(args, arg0);
     64 	while (va_arg(args, char *) != (char *)0) {
     65 		nargs++;
     66 	}
     67 
     68 	/*
     69 	 * save the environment pointer, which is at the end of the
     70 	 * variable argument list
     71 	 */
     72 
     73 	environmentp = va_arg(args, char **);
     74 	va_end(args);
     75 
     76 	/*
     77 	 * load the arguments in the variable argument list
     78 	 * into the argument vector, and add the terminating null pointer
     79 	 */
     80 
     81 	va_start(args, arg0);
     82 	/* workaround for bugid 1242839 */
     83 	argvec = (char **)alloca((size_t)((nargs + 2) * sizeof (char *)));
     84 	argp = argvec;
     85 	*argp++ = (char *)arg0;
     86 	while ((nextarg = va_arg(args, char *)) != (char *)0) {
     87 		*argp++ = nextarg;
     88 	}
     89 	va_end(args);
     90 	*argp = (char *)0;
     91 
     92 	/*
     93 	 * call execve()
     94 	 */
     95 
     96 	err = execve(file, argvec, environmentp);
     97 	return (err);
     98 }
     99