launchd.c

/*
 * Copyright (c) 2008 Pelle Johansson
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "launchd.h"

#if defined(__has_include)
#if __has_include(<launch.h>)
#define LAUNCHD 1
#endif
#endif

#if LAUNCHD
#include <launch.h>
#include <sys/types.h>
#include <event.h>
#include <err.h>
#include <errno.h>

#include "backend.h"

static struct event launchd_ev;

extern int running;

static void
launchd_handle_socket (const launch_data_t clients, const char *key, void *dummy) {
	int num = launch_data_array_get_count (clients);
	int i;

	for (i = 0 ; i < num ; i++) {
		launch_data_t client = launch_data_array_get_index (clients, i);
		int fd = launch_data_get_fd (client);

		if (fd < 0) {
			warn ("launchd_handle: get_fd");
			continue;
		}
		
		backend_listen_fd (key, fd);
	}
}

static void
launchd_handle (launch_data_t msg) {
	if (launch_data_get_type (msg) != LAUNCH_DATA_DICTIONARY) {
		warnx ("launchd_handle: msg not dictionary");
		launch_data_free (msg);
		return;
	}

	launch_data_t sockets = launch_data_dict_lookup (msg, LAUNCH_JOBKEY_SOCKETS);

	if (sockets) {
		launch_data_dict_iterate(sockets, launchd_handle_socket, NULL);
	} else
		warnx ("launchd_handle: no sockets");

	launch_data_free (msg);
}

static void
launchd_event (int fd, short what, void *cbarg) {
	launch_data_t msg = launch_msg (NULL);

	if (!msg) {
		if (errno)
			err (1, "launchd_handle");
		return;
	}

	launchd_handle (msg);
}
#endif

int
launchd_init (void) {
#if LAUNCHD
	launch_data_t checkin = launch_data_new_string (LAUNCH_KEY_CHECKIN);
	launch_data_t response;
	int fd;

	if (!checkin)
		errx (1, "launchd_init: Failed to create check in request");

	response = launch_msg (checkin);
	launch_data_free (checkin);

	if (!response)
		err (1, "launchd_init: No response");

	if (launch_data_get_type (response) == LAUNCH_DATA_ERRNO)
		errc (1, launch_data_get_errno (response), "launchd_init: Error checking in");

	launchd_handle (response);

	errno = 0;
	fd = launch_get_fd ();
	if (fd >= 0) {
		event_set (&launchd_ev, fd, EV_READ | EV_PERSIST, launchd_event, NULL);
		event_add (&launchd_ev, NULL);
	}

#endif
	return 0;
}