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 <string>
  13
  14 std::string _log_file; ///< File to reroute output of a forked OpenTTD to
  15 std::unique_ptr<FILE, FileDeleter> _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 #if defined(SUNOS) && !defined(_LP64) && !defined(_I32LPx)
  24 /* Solaris has, in certain situation, pid_t defined as long, while in other
  25  *  cases it has it defined as int... this handles all cases nicely.
  26  */
  27 # define PRINTF_PID_T "%ld"
  28 #else
  29 # define PRINTF_PID_T "%d"
  30 #endif
  31
  32 void DedicatedFork()
  33 {
  34         /* Fork the program */
  35         pid_t pid = fork();
  36         switch (pid) {
  37                 case -1:
  38                         perror("Unable to fork");
  39                         exit(1);
  40
  41                 case 0: { // We're the child
  42                         /* Open the log-file to log all stuff too */
  43                         _log_fd.reset(fopen(_log_file.c_str(), "a"));
  44                         if (!_log_fd) {
  45                                 perror("Unable to open logfile");
  46                                 exit(1);
  47                         }
  48                         /* Redirect stdout and stderr to log-file */
  49                         if (dup2(fileno(_log_fd.get()), fileno(stdout)) == -1) {
  50                                 perror("Rerouting stdout");
  51                                 exit(1);
  52                         }
  53                         if (dup2(fileno(_log_fd.get()), fileno(stderr)) == -1) {
  54                                 perror("Rerouting stderr");
  55                                 exit(1);
  56                         }
  57                         break;
  58                 }
  59
  60                 default:
  61                         /* We're the parent */
  62                         printf("Loading dedicated server...\n");
  63                         printf("  - Forked to background with pid " PRINTF_PID_T "\n", pid);
  64                         exit(0);
  65         }
  66 }
  67 #endif