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Add GTimeZoneMonitor
Monitors /etc/localtime for changes and instructs GTimeZone to drop its cache. Also has a signal for interested 3rd parties.
This commit is contained in:
Ryan Lortie
parent
de3a3b181a
commit
e9ce8f2374
@ -31,6 +31,7 @@
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<chapter id="file_mon">
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<title>File System Monitoring</title>
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<xi:include href="xml/gfilemonitor.xml"/>
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<xi:include href="xml/gtimezonemonitor.xml"/>
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</chapter>
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<chapter id="utils">
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<title>File-related Utilities</title>
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@ -3106,3 +3106,16 @@ G_TYPE_TLS_SERVER_CONNECTION
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<SUBSECTION Private>
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g_tls_server_connection_get_type
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</SECTION>
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<SECTION>
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<FILE>gtimezonemonitor</FILE>
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<TITLE>GTimeZoneMonitor</TITLE>
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GTimeZoneMonitor
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g_time_zone_monitor_get
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<SUBSECTION Standard>
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G_IS_TIME_ZONE_MONITOR
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G_TIME_ZONE_MONITOR
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G_TYPE_TIME_ZONE_MONITOR
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<SUBSECTION Private>
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g_time_zone_monitor_get_type
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</SECTION>
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@ -136,3 +136,4 @@ g_dbus_server_get_type
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g_dbus_auth_observer_get_type
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g_credentials_get_type
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g_unix_credentials_message_get_type
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g_time_zone_monitor_get_type
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@ -379,6 +379,7 @@ libgio_2_0_la_SOURCES = \
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gthemedicon.c \
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gthreadedresolver.c \
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gthreadedresolver.h \
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gtimezonemonitor.c \
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gtlsbackend.c \
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gtlscertificate.c \
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gtlsclientconnection.c \
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@ -532,6 +533,7 @@ gio_headers = \
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gtcpwrapperconnection.h \
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gthreadedsocketservice.h\
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gthemedicon.h \
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gtimezonemonitor.h \
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gtlsbackend.h \
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gtlscertificate.h \
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gtlsclientconnection.h \
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@ -119,6 +119,7 @@
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#include <gio/gtcpwrapperconnection.h>
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#include <gio/gthemedicon.h>
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#include <gio/gthreadedsocketservice.h>
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#include <gio/gtimezonemonitor.h>
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#include <gio/gtlsbackend.h>
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#include <gio/gtlscertificate.h>
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#include <gio/gtlsclientconnection.h>
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156
gio/gtimezonemonitor.c
Normal file
156
gio/gtimezonemonitor.c
Normal file
@ -0,0 +1,156 @@
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/*
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* Copyright © 2011 Codethink Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "gtimezonemonitor.h"
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#include "gfile.h"
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/**
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* SECTION:gtimezonemonitor
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* @title: GTimeZoneMonitor
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* @short_description: Monitor the local timezone
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*
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* #GTimeZoneMonitor is a utility class to monitor the local timezone for
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* changes (ie: in response to the user manually changing the timezone
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* to that of a different locale).
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*
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* You must use this class in order for your program to notice changes
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* to the local timezone. It works by monitoring the /etc/localtime
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* file. When the timezone is found to have changed,
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* g_time_zone_refresh_local() is called and the "changed" signal is
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* emitted on the #GTimeZoneMonitor (in that order).
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*
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* Windows support is not presently working.
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**/
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/**
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* GTimeZoneMonitor:
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*
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* This is an opaque structure type.
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**/
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typedef GObjectClass GTimeZoneMonitorClass;
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struct _GTimeZoneMonitor
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{
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GObject parent_instance;
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GFileMonitor *monitor;
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};
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G_DEFINE_TYPE (GTimeZoneMonitor, g_time_zone_monitor, G_TYPE_OBJECT)
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static guint g_time_zone_monitor_changed_signal;
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static void
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etc_localtime_changed (GFileMonitor *monitor,
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GFile *file,
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GFile *other_file,
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GFileMonitorEvent event_type,
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gpointer user_data)
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{
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GTimeZoneMonitor *tzm = user_data;
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if (event_type != G_FILE_MONITOR_EVENT_CREATED)
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return;
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g_time_zone_refresh_local ();
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g_signal_emit (tzm, g_time_zone_monitor_changed_signal, 0);
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}
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static void
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g_time_zone_monitor_finalize (GObject *object)
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{
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g_assert_not_reached ();
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}
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static void
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g_time_zone_monitor_init (GTimeZoneMonitor *tzm)
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{
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GFile *etc_localtime;
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etc_localtime = g_file_new_for_path ("/etc/localtime");
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tzm->monitor = g_file_monitor_file (etc_localtime, 0, NULL, NULL);
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g_object_unref (etc_localtime);
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g_signal_connect (tzm->monitor, "changed",
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G_CALLBACK (etc_localtime_changed), tzm);
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}
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static void
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g_time_zone_monitor_class_init (GTimeZoneMonitorClass *class)
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{
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class->finalize = g_time_zone_monitor_finalize;
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/**
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* GTimeZoneMonitor::changed
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* @monitor: the #GTimeZoneMonitor
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*
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* Indicates that the local timezone has changed.
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*
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* The g_time_zone_refresh_local() function is called just before this
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* signal is emitted, so any new #GTimeZone or #GDateTime instances
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* created from signal handlers will be as per the new timezone.
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*
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* Note that this signal is not emitted in response to entering or
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* exiting daylight savings time within a given timezone. It's only
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* for when the user has changed the timezone to that of a different
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* location.
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**/
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g_time_zone_monitor_changed_signal =
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g_signal_new ("changed", G_TYPE_TIME_ZONE_MONITOR,
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G_SIGNAL_RUN_FIRST, 0, NULL, NULL,
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g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
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}
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/**
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* g_time_zone_monitor_get:
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*
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* Gets the singleton instance of the #GTimeZoneMonitor class, creating
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* it if required.
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*
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* You should call g_object_unref() on the result when you no longer
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* need it. Be aware, though, that this will not destroy the instance,
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* so if you connected to the changed signal, you are required to
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* disconnect from it for yourself.
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*
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* There is only one instance of #GTimeZoneMonitor and it dispatches its
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* signals via the default #GMainContext. There is no way to create an
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* instance that will dispatch signals using a different context.
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*
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* Returns: a reference to the #GTimeZoneMonitor.
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**/
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GTimeZoneMonitor *
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g_time_zone_monitor_get (void)
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{
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static gsize instance;
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if (g_once_init_enter (&instance))
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{
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GTimeZoneMonitor *monitor;
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monitor = g_object_new (G_TYPE_TIME_ZONE_MONITOR, NULL);
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g_once_init_leave (&instance, (gsize) monitor);
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}
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return g_object_ref ((void *) instance);
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}
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47
gio/gtimezonemonitor.h
Normal file
47
gio/gtimezonemonitor.h
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@ -0,0 +1,47 @@
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/*
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* Copyright © 2011 Codethink Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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*/
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#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
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#error "Only <gio/gio.h> can be included directly."
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#endif
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#ifndef __G_TIME_ZONE_MONITOR_H__
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#define __G_TIME_ZONE_MONITOR_H__
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#include "gactiongroup.h"
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G_BEGIN_DECLS
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#define G_TYPE_TIME_ZONE_MONITOR (g_time_zone_monitor_get_type ())
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#define G_TIME_ZONE_MONITOR(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
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G_TYPE_TIME_ZONE_MONITOR, GTimeZoneMonitor))
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#define G_IS_TIME_ZONE_MONITOR(inst) (G_TYPE_CHECK_INSTANCE_TYPE ((inst), \
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G_TYPE_TIME_ZONE_MONITOR))
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typedef struct _GTimeZoneMonitor GTimeZoneMonitor;
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GType g_time_zone_monitor_get_type (void) G_GNUC_CONST;
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GTimeZoneMonitor * g_time_zone_monitor_get (void);
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G_END_DECLS
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#endif /* __G_TIME_ZONE_MONITOR_H__ */
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@ -492,6 +492,9 @@ g_time_zone_new_local (void)
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*
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* #GTimeZone does no monitoring of the local timezone on its own, which
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* is why you have to call this function to notify it of the change.
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*
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* If you use #GTimeZoneMonitor to watch for changes then this function
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* will automatically be called for you.
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**/
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void
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g_time_zone_refresh_local (void)
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