usr/src/lib/libc/port/sys/execle.c

   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 *) != NULL) {
  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 *)) != NULL) {
  87                 *argp++ = nextarg;
  88         }
  89         va_end(args);
  90         *argp = NULL;
  91
  92         /*
  93          * call execve()
  94          */
  95
  96         err = execve(file, argvec, environmentp);
  97         return (err);
  98 }