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execl.c revision 1.7.6.1 
      1 /*	$NetBSD: execl.c,v 1.7.6.1 2001/08/08 16:27:43 nathanw 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: execl.c,v 1.7.6.1 2001/08/08 16:27:43 nathanw Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <stdlib.h>
     47 #include <unistd.h>
     48 #include "reentrant.h"
     49 
     50 #if __STDC__
     51 #include <stdarg.h>
     52 #define VA_START(ap, last)	va_start(ap, last)
     53 #else
     54 #include <varargs.h>
     55 #define VA_START(ap, last)	va_start(ap)
     56 #endif
     57 
     58 #ifdef __weak_alias
     59 __weak_alias(execl,_execl)
     60 #endif
     61 
     62 
     63 extern char **environ;
     64 #ifdef _REENTRANT
     65 extern rwlock_t __environ_lock;
     66 #endif
     67 
     68 int
     69 #if __STDC__
     70 execl(const char *name, const char *arg, ...)
     71 #else
     72 execl(name, arg, va_alist)
     73 	const char *name;
     74 	const char *arg;
     75 	va_dcl
     76 #endif
     77 {
     78 	int r;
     79 #if defined(__i386__) || defined(__m68k__) || defined(__ns32k__)
     80 	rwlock_rdlock(&__environ_lock);
     81 	r = execve(name, (char **) &arg, environ);
     82 	rwlock_unlock(&__environ_lock);
     83 	return (r);
     84 #else
     85 	va_list ap;
     86 	char **argv;
     87 	int i;
     88 
     89 	VA_START(ap, arg);
     90 	for (i = 2; va_arg(ap, char *) != NULL; i++)
     91 		;
     92 	va_end(ap);
     93 
     94 	argv = alloca (i * sizeof (char *));
     95 
     96 	VA_START(ap, arg);
     97 	argv[0] = (char *) arg;
     98 	for (i = 1; (argv[i] = (char *) va_arg(ap, char *)) != NULL; i++)
     99 		;
    100 	va_end(ap);
    101 
    102 	rwlock_rdlock(&__environ_lock);
    103 	r = execve(name, argv, environ);
    104 	rwlock_unlock(&__environ_lock);
    105 	return (r);
    106 #endif
    107 }
    108