/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ 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 "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/mem/mem.h"
#include "libc/sysv/errfuns.h"

/**
 * Executes program, with path environment search.
 *
 * The current process is replaced with the executed one.
 *
 * @param prog is the program to launch
 * @param argv is [file,argv₁..argvₙ₋₁,NULL]
 * @param envp is ["key=val",...,NULL]
 * @return doesn't return on success, otherwise -1 w/ errno
 * @asyncsignalsafe
 * @vforksafe
 */
int execvpe(const char *prog, char *const argv[], char *const *envp) {
  char *exe;
  char pathbuf[PATH_MAX];
  if (IsAsan() && !__asan_is_valid(prog, 1)) return efault();
  if (!(exe = commandv(prog, pathbuf, sizeof(pathbuf)))) return -1;
  return execve(exe, argv, envp);
}