lib/libc/gen/execl.c

   1 /*      $NetBSD: execl.c,v 1.17 2011/06/30 19:46:07 joerg 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 1.17 2011/06/30 19:46:07 joerg 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
  48 #ifdef __weak_alias
  49 __weak_alias(execl,_execl)
  50 #endif
  51
  52
  53 extern char **environ;
  54
  55 int
  56 execl(const char *name, const char *arg, ...)
  57 {
  58         int r;
  59         va_list ap;
  60         char **argv;
  61         int i;
  62
  63         va_start(ap, arg);
  64         for (i = 2; va_arg(ap, char *) != NULL; i++)
  65                 continue;
  66         va_end(ap);
  67
  68         if ((argv = alloca(i * sizeof (char *))) == NULL) {
  69                 errno = ENOMEM;
  70                 return -1;
  71         }
  72
  73         va_start(ap, arg);
  74         argv[0] = __UNCONST(arg);
  75         for (i = 1; (argv[i] = va_arg(ap, char *)) != NULL; i++)
  76                 continue;
  77         va_end(ap);
  78
  79         r = execve(name, argv, environ);
  80         return r;
  81 }