/*
   Copyright (C) gnbdev

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "gnb_platform.h"

#ifdef __UNIX_LIKE_OS__

#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#endif

#ifdef __UNIX_LIKE_OS__

int gnb_daemon() {
  int ret;
  int fd;
  pid_t pid;
  pid = fork();
  if ( 0 != pid ) {
      exit(0);
  }
  setsid();
  signal(SIGHUP,SIG_IGN);
  pid = fork();
  if ( 0 != pid ) {
      exit(0);
  }
  ret = chdir("/");
  umask(0);
  fd = open("/dev/null", O_RDWR);
  if ( -1 == fd ) {
      return -1;
  }
  ret = dup2(fd, STDIN_FILENO);
  if ( -1 == ret ) {
      return -2;
  }
  ret = dup2(fd, STDOUT_FILENO);
  if ( -1 == ret ) {
      return -3;
  }
  return 0;
}

void save_pid(const char *pid_file) {
    FILE *file;
    file = fopen(pid_file,"w");
    if ( NULL==file ) {
        printf("open pid file[%s] err\n",pid_file);
        exit(1);
    }
    int pid = getpid();
    fprintf(file,"%d",pid);
    fclose(file);
}

#endif
