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execl.c revision 1.18 
      1 /*	$NetBSD: execl.c,v 1.18 2024/01/20 14:52:47 christos 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)exec.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: execl.c,v 1.18 2024/01/20 14:52:47 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <errno.h>
     43 #include <stdarg.h>
     44 #include <stdlib.h>
     45 #include <unistd.h>
     46 #include "reentrant.h"
     47 #include "extern.h"
     48 
     49 #ifdef __weak_alias
     50 __weak_alias(execl,_execl)
     51 #endif
     52 
     53 
     54 int
     55 execl(const char *name, const char *arg, ...)
     56 {
     57 	int r;
     58 	va_list ap;
     59 	char **argv;
     60 	int i;
     61 
     62 	va_start(ap, arg);
     63 	for (i = 2; va_arg(ap, char *) != NULL; i++)
     64 		continue;
     65 	va_end(ap);
     66 
     67 	if ((argv = alloca(i * sizeof (char *))) == NULL) {
     68 		errno = ENOMEM;
     69 		return -1;
     70 	}
     71 
     72 	va_start(ap, arg);
     73 	argv[0] = __UNCONST(arg);
     74 	for (i = 1; (argv[i] = va_arg(ap, char *)) != NULL; i++)
     75 		continue;
     76 	va_end(ap);
     77 
     78 	r = execve(name, argv, environ);
     79 	return r;
     80 }
     81