src/dedicated.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file dedicated.cpp Forking support for dedicated servers. */
  11
  12 #include "stdafx.h"
  13
  14 #ifdef ENABLE_NETWORK
  15
  16 char *_log_file = NULL; ///< File to reroute output of a forked OpenTTD to
  17 FILE *_log_fd   = NULL; ///< File to reroute output of a forked OpenTTD to
  18
  19 #if defined(UNIX) && !defined(__MORPHOS__)
  20
  21 #include <unistd.h>
  22
  23 #if (defined(SUNOS) && !defined(_LP64) && !defined(_I32LPx)) || defined(__HAIKU__)
  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  * Haiku has also defined pid_t as a long.
  27  */
  28 # define PRINTF_PID_T "%ld"
  29 #else
  30 # define PRINTF_PID_T "%d"
  31 #endif
  32
  33 void DedicatedFork()
  34 {
  35         /* Fork the program */
  36         pid_t pid = fork();
  37         switch (pid) {
  38                 case -1:
  39                         perror("Unable to fork");
  40                         exit(1);
  41
  42                 case 0: { // We're the child
  43                         /* Open the log-file to log all stuff too */
  44                         _log_fd = fopen(_log_file, "a");
  45                         if (_log_fd == NULL) {
  46                                 perror("Unable to open logfile");
  47                                 exit(1);
  48                         }
  49                         /* Redirect stdout and stderr to log-file */
  50                         if (dup2(fileno(_log_fd), fileno(stdout)) == -1) {
  51                                 perror("Rerouting stdout");
  52                                 exit(1);
  53                         }
  54                         if (dup2(fileno(_log_fd), fileno(stderr)) == -1) {
  55                                 perror("Rerouting stderr");
  56                                 exit(1);
  57                         }
  58                         break;
  59                 }
  60
  61                 default:
  62                         /* We're the parent */
  63                         printf("Loading dedicated server...\n");
  64                         printf("  - Forked to background with pid " PRINTF_PID_T "\n", pid);
  65                         exit(0);
  66         }
  67 }
  68 #endif
  69
  70 #else
  71
  72 /** Empty helper function call for NOT(UNIX and not MORPHOS) systems */
  73 void DedicatedFork() {}
  74
  75 #endif /* ENABLE_NETWORK */