/* Copyright (c) 2014, Michael Santos <michael.santos@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "alcove.h"
#include "alcove_call.h"

/*
 * execve(2)
 *
 */
ssize_t alcove_sys_execve(alcove_state_t *ap, const char *arg, size_t len,
                          char *reply, size_t rlen) {
  int index = 0;

  char filename[PATH_MAX] = {0};
  size_t flen = sizeof(filename) - 1;
  char **argv = NULL;
  char **envp = NULL;
  int errnum = 0;

  UNUSED(ap);

  /* filename */
  if (alcove_decode_iolist(arg, len, &index, filename, &flen) < 0 || flen == 0)
    return -1;

  /* argv */
  if (alcove_decode_argv(arg, len, &index, &argv) < 0)
    return -1;

  /* envp */
  if (alcove_decode_argv(arg, len, &index, &envp) < 0)
    return -1;

  execve(filename, argv, envp);

  errnum = errno;

  alcove_free_argv(argv);
  alcove_free_argv(envp);

  return alcove_mk_errno(reply, rlen, errnum);
}