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
  12 char *_log_file = nullptr; ///< File to reroute output of a forked OpenTTD to
  13 FILE *_log_fd   = nullptr; ///< File to reroute output of a forked OpenTTD to
  14
  15 #if defined(UNIX)
  16
  17 #include <unistd.h>
  18
  19 #include "safeguards.h"
  20
  21 #if defined(SUNOS) && !defined(_LP64) && !defined(_I32LPx)
  22 /* Solaris has, in certain situation, pid_t defined as long, while in other
  23  *  cases it has it defined as int... this handles all cases nicely.
  24  */
  25 # define PRINTF_PID_T "%ld"
  26 #else
  27 # define PRINTF_PID_T "%d"
  28 #endif
  29
  30 void DedicatedFork()
  31 {
  32         /* Fork the program */
  33         pid_t pid = fork();
  34         switch (pid) {
  35                 case -1:
  36                         perror("Unable to fork");
  37                         exit(1);
  38
  39                 case 0: { // We're the child
  40                         /* Open the log-file to log all stuff too */
  41                         _log_fd = fopen(_log_file, "a");
  42                         if (_log_fd == nullptr) {
  43                                 perror("Unable to open logfile");
  44                                 exit(1);
  45                         }
  46                         /* Redirect stdout and stderr to log-file */
  47                         if (dup2(fileno(_log_fd), fileno(stdout)) == -1) {
  48                                 perror("Rerouting stdout");
  49                                 exit(1);
  50                         }
  51                         if (dup2(fileno(_log_fd), fileno(stderr)) == -1) {
  52                                 perror("Rerouting stderr");
  53                                 exit(1);
  54                         }
  55                         break;
  56                 }
  57
  58                 default:
  59                         /* We're the parent */
  60                         printf("Loading dedicated server...\n");
  61                         printf("  - Forked to background with pid " PRINTF_PID_T "\n", pid);
  62                         exit(0);
  63         }
  64 }
  65 #endif