lib/libc/posix/_execle.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #define execle _execle
  31 #define execve _execve
  32 #include <unistd.h>
  33 #include <minix/compiler.h>
  34 #include <errno.h>
  35 #include <stdarg.h>
  36 #include <sys/types.h>
  37 #include <stdlib.h>
  38 #include <alloca.h>
  39 #include <lib.h>
  40
  41 #ifndef __UNCONST
  42 #define __UNCONST(x) ((void *) (x))
  43 #endif
  44
  45 int execle(const char *path, const char *arg1, ...)
  46 /* execle("/bin/sh", "sh", "-c", "example", (char *) 0, my_env_array); */
  47 {
  48   char * const * envp;
  49   va_list ap;
  50 #if FUNC_ARGS_ARRAY
  51   /*
  52         * execle() - execute with a custom environment
  53         * Author: Kees J. Bot, 21 Jan 1994
  54         */
  55         va_start(ap, arg1);
  56
  57         /* Find the end of the argument array. */
  58         if (arg1 != NULL) while (va_arg(ap, const char *) != NULL) {}
  59
  60         envp = va_arg(ap, char * const *);
  61         va_end(ap);
  62
  63         return execve(path, (char * const *) &arg1, envp);
  64 #else
  65         char **argv;
  66         int i;
  67
  68         va_start(ap, arg1);
  69         for (i = 2; va_arg(ap, char *) != NULL; i++)
  70                 continue;
  71         va_end(ap);
  72
  73         if ((argv = alloca(i * sizeof (char *))) == NULL) {
  74                 errno = ENOMEM;
  75                 return -1;
  76         }
  77
  78         va_start(ap, arg1);
  79         argv[0] = __UNCONST(arg1);
  80         for (i = 1; (argv[i] = va_arg(ap, char *)) != NULL; i++)
  81                 continue;
  82         envp = va_arg(ap, char **);
  83         va_end(ap);
  84
  85         return execve(path, (char * const *)argv, envp);
  86 #endif
  87 }