gpsd_dbus.c

来自「gpsd, a popular GPS daemon.」· C语言 代码 · 共 73 行

/* $Id: gpsd_dbus.c 3666 2006-10-26 23:11:51Z ckuethe $ */
#include <sys/types.h>
#include <stdio.h>
#include "gpsd_config.h"
#ifdef DBUS_ENABLE
#include <gpsd_dbus.h>

static DBusConnection* connection = NULL;

/*
 * Does what is required to initialize the dbus connection
 * This is pretty basic at this point, as we don't receive commands via dbus.
 * Returns 0 when everything is OK.
 */
int initialize_dbus_connection(void) {
    DBusError	error;

    dbus_error_init(&error);
    connection = dbus_bus_get (DBUS_BUS_SYSTEM, &error);
    if (connection == NULL) {
	/* report error */
	return 1;
    }
    return 0;
}

void send_dbus_fix(struct gps_device_t* channel) {
/* sends the current fix data for this channel via dbus */
    struct gps_data_t*	gpsdata;
    struct gps_fix_t*	gpsfix;
    DBusMessage*	message;
    /*DBusMessageIter	iter;*/
    dbus_uint32_t	serial; /* collected, but not used */

    /* if the connection is non existent, return without doing anything */
    if (connection == NULL) return;

    gpsdata = &(channel->gpsdata);
    gpsfix = &(gpsdata->fix);

    message = dbus_message_new_signal(
		    "/org/gpsd",
		    "org.gpsd",
		    "fix");

    /* add the interesting information to the message */
    dbus_message_append_args (message,
		    	      DBUS_TYPE_DOUBLE, &(gpsfix->time),
			      DBUS_TYPE_INT32,	&(gpsfix->mode),
			      DBUS_TYPE_DOUBLE,	&(gpsfix->ept),
			      DBUS_TYPE_DOUBLE, &(gpsfix->latitude),
			      DBUS_TYPE_DOUBLE, &(gpsfix->longitude),
			      DBUS_TYPE_DOUBLE, &(gpsfix->eph),
			      DBUS_TYPE_DOUBLE, &(gpsfix->altitude),
			      DBUS_TYPE_DOUBLE, &(gpsfix->epv),
			      DBUS_TYPE_DOUBLE, &(gpsfix->track),
			      DBUS_TYPE_DOUBLE, &(gpsfix->epd),
			      DBUS_TYPE_DOUBLE, &(gpsfix->speed),
			      DBUS_TYPE_DOUBLE, &(gpsfix->eps),
			      DBUS_TYPE_DOUBLE, &(gpsfix->climb),
			      DBUS_TYPE_DOUBLE, &(gpsfix->epc),
			      DBUS_TYPE_INVALID);
    
    dbus_message_set_no_reply(message, TRUE);

    /* message is complete time to send it */
    dbus_connection_send(connection, message, &serial);
    dbus_message_unref(message);
}

#endif /* DBUS_ENABLE */