src/dedicated.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * OpenTTD 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, version 2.
   4  * OpenTTD 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.
   5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   6  */
   7
   8 /** @file dedicated.cpp Forking support for dedicated servers. */
   9
  10 #include "stdafx.h"
  11 #include "fileio_func.h"
  12 #include "debug.h"
  13
  14 std::string _log_file; ///< Filename to reroute output of a forked OpenTTD to
  15 std::optional<FileHandle> _log_fd; ///< File to reroute output of a forked OpenTTD to
  16
  17 #if defined(UNIX)
  18
  19 #include <unistd.h>
  20
  21 #include "safeguards.h"
  22
  23 void DedicatedFork()
  24 {
  25         /* Fork the program */
  26         pid_t pid = fork();
  27         switch (pid) {
  28                 case -1:
  29                         perror("Unable to fork");
  30                         exit(1);
  31
  32                 case 0: { // We're the child
  33                         /* Open the log-file to log all stuff too */
  34                         _log_fd = FileHandle::Open(_log_file, "a");
  35                         if (!_log_fd.has_value()) {
  36                                 perror("Unable to open logfile");
  37                                 exit(1);
  38                         }
  39                         /* Redirect stdout and stderr to log-file */
  40                         if (dup2(fileno(*_log_fd), fileno(stdout)) == -1) {
  41                                 perror("Rerouting stdout");
  42                                 exit(1);
  43                         }
  44                         if (dup2(fileno(*_log_fd), fileno(stderr)) == -1) {
  45                                 perror("Rerouting stderr");
  46                                 exit(1);
  47                         }
  48                         break;
  49                 }
  50
  51                 default:
  52                         /* We're the parent */
  53                         Debug(net, 0, "Loading dedicated server...");
  54                         Debug(net, 0, "  - Forked to background with pid {}", pid);
  55                         exit(0);
  56         }
  57 }
  58 #endif