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execle.c revision 1.6 
      1 /*	$NetBSD: execle.c,v 1.6 2000/01/22 22:19:09 mycroft Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)exec.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: execle.c,v 1.6 2000/01/22 22:19:09 mycroft Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <stdlib.h>
     47 #include <unistd.h>
     48 
     49 #if __STDC__
     50 #include <stdarg.h>
     51 #define VA_START(ap, last)	va_start(ap, last)
     52 #else
     53 #include <varargs.h>
     54 #define VA_START(ap, last)	va_start(ap)
     55 #endif
     56 
     57 #ifdef __weak_alias
     58 __weak_alias(execle,_execle)
     59 #endif
     60 
     61 int
     62 #if __STDC__
     63 execle(const char *name, const char *arg, ...)
     64 #else
     65 execle(name, arg, va_alist)
     66 	const char *name;
     67 	const char *arg;
     68 	va_dcl
     69 #endif
     70 {
     71 #if defined(__i386__) || defined(__m68k__) || defined(__ns32k__)
     72 	va_list ap;
     73 	char **envp;
     74 
     75 	VA_START(ap, arg);
     76 	while ((va_arg(ap, char *)) != NULL)
     77 		;
     78 	envp = va_arg(ap, char **);
     79 	va_end(ap);
     80 
     81 	return execve(name, (char **) &arg, envp);
     82 #else
     83 	va_list ap;
     84 	char **argv, **envp;
     85 	int i;
     86 
     87 	VA_START(ap, arg);
     88 	for (i = 2; va_arg(ap, char *) != NULL; i++)
     89 		;
     90 	va_end(ap);
     91 
     92 	argv = alloca (i * sizeof (char *));
     93 
     94 	VA_START(ap, arg);
     95 	argv[0] = (char *) arg;
     96 	for (i = 1; (argv[i] = (char *) va_arg(ap, char *)) != NULL; i++)
     97 		;
     98 	envp = (char **) va_arg(ap, char **);
     99 	va_end(ap);
    100 
    101 	return execve(name, argv, envp);
    102 #endif
    103 }
    104