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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Gypsy
*
* A simple to use and understand GPSD replacement
* that uses D-Bus, GLib and memory allocations
*
* Author: Iain Holmes <iain@gnome.org>
* Copyright (C) 2007
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <glib.h>
#include <dbus/dbus-protocol.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-bindings.h>
#include "gypsy-server.h"
#define GYPSY_NAME "org.freedesktop.Gypsy"
#define DEFAULT_PID_FILE LOCALSTATEDIR"/run/Gypsy.pid"
static GMainLoop *mainloop;
/* This is a bit ugly, but it works */
char* nmea_log = NULL;
static void
gypsy_terminate (GObject *object,
gpointer userdata)
{
g_main_loop_quit (mainloop);
}
static void
write_pidfile (const char *pidfile)
{
FILE *f;
if ((f = fopen (pidfile, "w")) == NULL) {
g_printerr ("Opening %s failed: %s\n", pidfile, strerror (errno));
return;
}
if (fprintf (f, "%d", getpid ()) < 0) {
g_printerr ("Writing to %s failed: %s\n", pidfile, strerror (errno));
}
if (fclose (f)) {
g_printerr ("Closing %s failed: %s\n", pidfile, strerror (errno));
}
}
static void
name_owner_changed (DBusGProxy *proxy,
const char *name,
const char *prev_owner,
const char *new_owner,
GypsyServer *server)
{
if (strcmp (new_owner, "") == 0 && strcmp (name, prev_owner) == 0) {
gypsy_server_remove_clients (server, prev_owner);
}
}
int
main (int argc,
char **argv)
{
GOptionContext *context;
DBusGConnection *conn;
DBusGProxy *proxy;
GError *error = NULL;
guint32 request_name_ret;
GypsyServer *gypsy;
gboolean become_daemon = FALSE;
char *pidfile = NULL;
char *user_pidfile = NULL;
GOptionEntry entries[] = {
{ "nmea-log", 0, 0, G_OPTION_ARG_FILENAME, &nmea_log, "Log NMEA data to FILE.[device]", "FILE" },
{ "no-daemon", 0, 0, G_OPTION_ARG_NONE, &become_daemon, "Don't become a daemon", NULL },
{ "pid-file", 0, 0, G_OPTION_ARG_FILENAME, &user_pidfile, "Specify the location of a PID file", "FILE" },
{ NULL }
};
if (getuid () != 0) {
g_printerr ("You must be root to run %s\n", argv[0]);
return 1;
}
context = g_option_context_new ("- GPS daemon");
g_option_context_add_main_entries (context, entries, NULL);
if (!g_option_context_parse (context, &argc, &argv, &error)) {
#if GLIB_CHECK_VERSION(2, 14, 0)
char *help;
help = g_option_context_get_help (context, TRUE, NULL);
g_print (help);
g_free (help);
#else
g_printerr ("Cannot parse arguments: %s\n", error->message);
#endif
g_error_free (error);
return 1;
}
pidfile = g_strdup (user_pidfile ? user_pidfile : DEFAULT_PID_FILE);
/* Tricky: become_daemon is FALSE by default, so unless it's TRUE
because of a CLI option, it'll become TRUE after this
*/
become_daemon = !become_daemon;
if (become_daemon) {
if (daemon (0, 0) < 0) {
int saved_errno;
saved_errno = errno;
g_printerr ("Could not daemonize: %s [error %u]\n",
g_strerror (saved_errno), saved_errno);
return 1;
}
write_pidfile (pidfile);
}
g_free (pidfile);
g_option_context_free (context);
umask (022);
g_type_init ();
mainloop = g_main_loop_new (NULL, FALSE);
conn = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error);
if (!conn) {
g_error ("Error getting bus: %s", error->message);
return 1;
}
proxy = dbus_g_proxy_new_for_name (conn,
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS);
if (!org_freedesktop_DBus_request_name (proxy, GYPSY_NAME,
0, &request_name_ret,
&error)) {
g_error ("Error registering D-Bus service %s: %s",
GYPSY_NAME, error->message);
return 1;
}
/* Just quit if GPS is already running */
if (request_name_ret != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
return 1;
}
gypsy = g_object_new (GYPSY_TYPE_SERVER, NULL);
g_signal_connect (G_OBJECT (gypsy), "terminate",
G_CALLBACK (gypsy_terminate), NULL);
dbus_g_proxy_add_signal (proxy, "NameOwnerChanged",
G_TYPE_STRING, G_TYPE_STRING,
G_TYPE_STRING, G_TYPE_INVALID);
dbus_g_proxy_connect_signal (proxy, "NameOwnerChanged",
G_CALLBACK (name_owner_changed),
gypsy, NULL);
dbus_g_connection_register_g_object (conn, "/org/freedesktop/Gypsy", G_OBJECT (gypsy));
g_main_loop_run (mainloop);
return 0;
}
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