src/interfaces/timedated/timedated.c

   1 /*
   2  * Copyright (c) 2014 Ian Sutton <ian@kremlin.cc>
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <unistd.h>
  18 #include <limits.h>
  19 #include <signal.h>
  20
  21 #include <sys/types.h>
  22 #include <time.h>
  23 #include <string.h>
  24
  25 #include <glib/gprintf.h>
  26 #include <glib-unix.h>
  27 #include <polkit/polkit.h>
  28
  29 #include "timedated-gen.h"
  30 #include "timedated.h"
  31
  32 #include "../../util.h"
  33
  34 GPtrArray *timedated_freeable;
  35 Timedate1 *timedated_interf;
  36
  37 GMainLoop *timedated_loop;
  38
  39 guint bus_descriptor;
  40 gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
  41
  42 /* --- begin method/property/dbus signal code --- */
  43
  44 static gboolean
  45 on_handle_set_time(Timedate1 *hn1_passed_interf,
  46                    GDBusMethodInvocation *invoc,
  47                    const gchar *greet,
  48                    gpointer data) {
  49     return FALSE;
  50 }
  51
  52 static gboolean
  53 on_handle_set_timezone(Timedate1 *hn1_passed_interf,
  54                    GDBusMethodInvocation *invoc,
  55                    const gchar *greet,
  56                    gpointer data) {
  57     return FALSE;
  58 }
  59
  60 static gboolean
  61 on_handle_set_local_rtc(Timedate1 *hn1_passed_interf,
  62                         GDBusMethodInvocation *invoc,
  63                         const gchar *greet,
  64                         gpointer data) {
  65     return FALSE;
  66 }
  67
  68 static gboolean
  69 on_handle_set_ntp(Timedate1 *hn1_passed_interf,
  70                   GDBusMethodInvocation *invoc,
  71                   const gchar *greet,
  72                   gpointer data) {
  73     return FALSE;
  74 }
  75
  76 const gchar *
  77 our_get_timezone() {
  78
  79     return "";
  80 }
  81
  82 gboolean
  83 our_get_local_rtc() {
  84
  85     gboolean ret = FALSE;
  86
  87     return ret;
  88 }
  89
  90 gboolean
  91 our_get_can_ntp() {
  92
  93     const gboolean ret = FALSE;
  94
  95     return ret;
  96 }
  97
  98 gboolean
  99 our_get_ntp() {
 100
 101     const gboolean ret = FALSE;
 102
 103     return ret;
 104 }
 105
 106 gboolean
 107 our_get_ntpsynchronized() {
 108
 109     const gboolean ret = FALSE;
 110
 111     return ret;
 112 }
 113
 114 guint64
 115 our_get_time_usec() {
 116
 117     guint64 ret = 0;
 118
 119     return ret;
 120 }
 121
 122 guint64
 123 our_get_rtc_time_usec() {
 124
 125     guint64 ret = 0;
 126
 127     return ret;
 128 }
 129
 130 /* --- end method/property/dbus signal code, begin bus/name handlers --- */
 131
 132 static void timedated_on_bus_acquired(GDBusConnection *conn,
 133                                       const gchar *name,
 134                                       gpointer user_data) {
 135
 136     g_printf("got bus/name, exporting %s's interface...\n", name);
 137
 138     timedated_interf = timedate1_skeleton_new();
 139
 140     /* attach function pointers to generated struct's method handlers */
 141     g_signal_connect(timedated_interf, "handle-set-time",     G_CALLBACK(on_handle_set_time),     NULL);
 142     g_signal_connect(timedated_interf, "handle-set-timezone", G_CALLBACK(on_handle_set_timezone), NULL);
 143     g_signal_connect(timedated_interf, "handle-set-local-rtc", G_CALLBACK(on_handle_set_local_rtc), NULL);
 144     g_signal_connect(timedated_interf, "handle-set-ntp",      G_CALLBACK(on_handle_set_ntp),      NULL);
 145     /* set our properties before export */
 146     timedate1_set_timezone(timedated_interf, our_get_timezone());
 147     timedate1_set_local_rtc(timedated_interf, our_get_local_rtc());
 148     timedate1_set_can_ntp(timedated_interf, our_get_can_ntp());
 149     timedate1_set_ntp(timedated_interf, our_get_ntp());
 150     timedate1_set_ntpsynchronized(timedated_interf, our_get_ntpsynchronized());
 151     timedate1_set_time_usec(timedated_interf, our_get_time_usec());
 152     timedate1_set_rtctime_usec(timedated_interf, our_get_rtc_time_usec());
 153
 154     if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(timedated_interf),
 155                                          conn,
 156                                          "/org/freedesktop/timedate1",
 157                                          NULL)) {
 158
 159         g_printf("failed to export %s's interface!\n", name);
 160         timedated_mem_clean();
 161
 162     } else {
 163
 164         dbus_interface_exported = TRUE;
 165         g_printf("exported %s's interface on the system bus...\n", name);
 166     }
 167 }
 168
 169 static void timedated_on_name_acquired(GDBusConnection *conn,
 170                                        const gchar *name,
 171                                        gpointer user_data) {
 172
 173    g_printf("success!\n");
 174 }
 175
 176 static void timedated_on_name_lost(GDBusConnection *conn,
 177                                    const gchar *name,
 178                                    gpointer user_data) {
 179
 180     if(!conn) {
 181
 182         g_printf("failed to connect to the system bus while trying to acquire name '%s': either dbus-daemon isn't running or we don't have permission to push names and/or their interfaces to it.\n", name);
 183         timedated_mem_clean();
 184     }
 185
 186     g_print("lost name %s, exiting...\n", name);
 187
 188     timedated_mem_clean();
 189 }
 190
 191 /* --- end bus/name handlers, begin misc unix functions --- */
 192
 193 /* safe call to clean and then exit
 194  * this stops our GMainLoop safely before letting main() return */
 195 void timedated_mem_clean() {
 196
 197     g_printf("exiting...\n");
 198
 199     if(dbus_interface_exported)
 200         g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(timedated_interf));
 201
 202      if(g_main_loop_is_running(timedated_loop))
 203         g_main_loop_quit(timedated_loop);
 204
 205 }
 206
 207 /* wrapper for glib's unix signal handling; called only once if terminating signal is raised against us */
 208 gboolean unix_sig_terminate_handler(gpointer data) {
 209
 210     g_printf("caught SIGINT/HUP/TERM, exiting\n");
 211
 212     timedated_mem_clean();
 213     return G_SOURCE_REMOVE;
 214 }
 215
 216 void set_signal_handlers() {
 217
 218     /* we don't care about its descriptor, we never need to unregister these */
 219     g_unix_signal_add(SIGINT,  unix_sig_terminate_handler, NULL);
 220     g_unix_signal_add(SIGHUP,  unix_sig_terminate_handler, NULL);
 221     g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
 222 }
 223
 224 int main() {
 225
 226     set_signal_handlers();
 227
 228     timedated_loop = g_main_loop_new(NULL, TRUE);
 229     timedated_freeable = g_ptr_array_new();
 230
 231      bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
 232                                     "org.freedesktop.timedate1",
 233                                     G_BUS_NAME_OWNER_FLAGS_NONE,
 234                                     timedated_on_bus_acquired,
 235                                     timedated_on_name_acquired,
 236                                     timedated_on_name_lost,
 237                                     NULL,
 238                                     NULL);
 239
 240     g_main_loop_run(timedated_loop);
 241     /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
 242     g_main_loop_unref(timedated_loop);
 243
 244     /* guaranteed unownable */
 245     g_bus_unown_name(bus_descriptor);
 246
 247     /* at this point no operations can occur with our data, it is safe to free it + its container */
 248     g_ptr_array_free(timedated_freeable, TRUE);
 249
 250     return 0;
 251 }