/* Optional /dev/initctl FIFO monitor
 *
 * Copyright (c) 2008-2010  Claudio Matsuoka <cmatsuoka@gmail.com>
 * Copyright (c) 2008-2012  Joachim Nilsson <troglobit@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <features.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/select.h>         /* According to POSIX.1-2001 */
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "finit.h"

#define INIT_MAGIC		0x03091969
#define INIT_CMD_RUNLVL		1

struct init_request {
	int	magic;		/* Magic number			*/
	int	cmd;		/* What kind of request		*/
	int	runlevel;	/* Runlevel to change to	*/
	int	sleeptime;	/* Time between TERM and KILL	*/
	char	data[368];
};

#ifdef LISTEN_INITCTL
/* Standard reboot/shutdown utilities talk to init using /dev/initctl.
 * We should check if the fifo was recreated and reopen it.
 */
void listen_initctl(void)
{
        _d("Forking %s watcher...", FINIT_FIFO);
	if (!fork()) {
		int ctl;
		fd_set fds;
		struct init_request request;

                _d("Setting up %s", FINIT_FIFO);
		mkfifo(FINIT_FIFO, 0600);
		ctl = open(FINIT_FIFO, O_RDONLY);

		while (1) {
			FD_ZERO(&fds);
			FD_SET(ctl, &fds);
                        _d("Pending %s activity...", FINIT_FIFO);
			if (select(ctl + 1, &fds, NULL, NULL, NULL) <= 0)
				continue;

                        _d("Receiving request on %s...", FINIT_FIFO);
			read(ctl, &request, sizeof(request));

			if (request.magic != INIT_MAGIC)
				continue;

                        _d("Magic OK...");
			if (request.cmd == INIT_CMD_RUNLVL) {
				switch (request.runlevel) {
				case '0':
                                        _d("Halting system (SIGUSR2)");
					do_shutdown(SIGUSR2);
					break;

				case '6':
                                        _d("Rebooting system (SIGUSR1)");
					do_shutdown(SIGUSR1);
                                        break;

                                default:
                                        _d("Unsupported runlevel: %d", request.runlevel);
                                        break;
				}
			}
		}
	}
}

#endif  /* LISTEN_INITCTL */

/**
 * Local Variables:
 *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
 */