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/*
 * Copyright (c) 2017 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "icnet_utils_daemonizator.h"
#include "icnet_errors_runtime_exception.h"
#include <cstdlib>
#include <unistd.h>
#include <iostream>
#include <sys/stat.h>

namespace utils {

void Daemonizator::daemonize() {
  pid_t process_id = 0;
  pid_t sid = 0;

  // Create child process
  process_id = fork();

  // Indication of fork() failure
  if (process_id < 0) {
    throw errors::RuntimeException("Fork failed.");
  }

  // PARENT PROCESS. Need to kill it.
  if (process_id > 0) {
    std::cout << "Process id of child process " << process_id << std::endl;
    // return success in exit status
    exit(EXIT_SUCCESS);
  }

  // unmask the file mode
  umask(0);

  // set new session
  sid = setsid();
  if (sid < 0) {
    // Return failure
    exit(EXIT_FAILURE);
  }

  // Change the current working directory to root.
  int ret = chdir("/");

  if (ret < 0) {
    throw errors::RuntimeException("Error changing working directory to root");
  }

  // Close stdin. stdout and stderr

  close(STDIN_FILENO);
  close(STDOUT_FILENO);
  close(STDERR_FILENO);

  // Really start application
}

}