/*
   +----------------------------------------------------------------------+
   | HipHop for PHP                                                       |
   +----------------------------------------------------------------------+
   | Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com)     |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
*/

#include "hphp/util/current_executable.h"
#include <unistd.h>
#include <limits.h>

namespace HPHP {

std::string current_executable_path() {
#ifdef __linux__
  char result[PATH_MAX];
  ssize_t count = readlink("/proc/self/exe", result, PATH_MAX);
  return std::string(result, (count > 0) ? count : 0);
#elif defined(__APPLE__)
  char result[PATH_MAX];
  uint32_t size = sizeof(result);
  uint32_t success = _NSGetExecutablePath(result, &size);
  return std:string(result, (success == 0) ? size : 0);
#else
  // Return empty string for all other platforms for now (e.g. FreeBSD)
  return std::string();
#endif
}

}