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Patric Stout

Remove: ENABLE_NETWORK switch

This switch has been a pain for years. Often disabling broke
compilation, as no developer compiles OpenTTD without, neither do
any of our official binaries.

Additionaly, it has grown so hugely in our codebase, that it
clearly shows that the current solution was a poor one. 350+
instances of "#ifdef ENABLE_NETWORK" were in the code, of which
only ~30 in the networking code itself. The rest were all around
the code to do the right thing, from GUI to NewGRF.

A more proper solution would be to stub all the functions, and
make sure the rest of the code can simply assume network is
available. This was also partially done, and most variables were
correct if networking was disabled. Despite that, often the #ifdefs
were still used.

With the recent removal of DOS, there is also no platform anymore
which we support where networking isn't working out-of-the-box.

All in all, it is time to remove the ENABLE_NETWORK switch. No
replacement is planned, but if you feel we really need this option,
we welcome any Pull Request which implements this in a way that
doesn't crawl through the code like this diff shows we used to.

/* $Id$ */

/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */

/** @file dedicated.cpp Forking support for dedicated servers. */

#include "stdafx.h"

char *_log_file = NULL; ///< File to reroute output of a forked OpenTTD to
FILE *_log_fd   = NULL; ///< File to reroute output of a forked OpenTTD to

#if defined(UNIX)

#include <unistd.h>

#include "safeguards.h"

#if defined(SUNOS) && !defined(_LP64) && !defined(_I32LPx)
/* Solaris has, in certain situation, pid_t defined as long, while in other
 *  cases it has it defined as int... this handles all cases nicely.
 */
# define PRINTF_PID_T "%ld"
#else
# define PRINTF_PID_T "%d"
#endif

void DedicatedFork()
{
	/* Fork the program */
	pid_t pid = fork();
	switch (pid) {
		case -1:
			perror("Unable to fork");
			exit(1);

		case 0: { // We're the child
			/* Open the log-file to log all stuff too */
			_log_fd = fopen(_log_file, "a");
			if (_log_fd == NULL) {
				perror("Unable to open logfile");
				exit(1);
			}
			/* Redirect stdout and stderr to log-file */
			if (dup2(fileno(_log_fd), fileno(stdout)) == -1) {
				perror("Rerouting stdout");
				exit(1);
			}
			if (dup2(fileno(_log_fd), fileno(stderr)) == -1) {
				perror("Rerouting stderr");
				exit(1);
			}
			break;
		}

		default:
			/* We're the parent */
			printf("Loading dedicated server...\n");
			printf("  - Forked to background with pid " PRINTF_PID_T "\n", pid);
			exit(0);
	}
}
#endif