git.maemo.org Git - browser-switch/blob - main.c

   1 /*
   2  * main.c -- config file parsing and main loop for browser-switchboard
   3  *
   4  * Copyright (C) 2009-2010 Steven Luo
   5  * Derived from a Python implementation by Jason Simpson and Steven Luo
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20  * USA.
  21  */
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <signal.h>
  26 #include <sys/types.h>
  27 #include <sys/wait.h>
  28 #include <dbus/dbus-glib.h>
  29
  30 #include "browser-switchboard.h"
  31 #include "launcher.h"
  32 #include "dbus-server-bindings.h"
  33 #include "configfile.h"
  34 #include "log.h"
  35
  36 struct swb_context ctx;
  37
  38 static void set_config_defaults(struct swb_context *ctx) {
  39         if (!ctx)
  40                 return;
  41         free(ctx->other_browser_cmd);
  42         ctx->continuous_mode = 0;
  43         ctx->default_browser_launcher = NULL;
  44         ctx->other_browser_cmd = NULL;
  45 }
  46
  47 static void waitforzombies(int signalnum) {
  48         while (waitpid(-1, NULL, WNOHANG) > 0)
  49                 log_msg("Waited for a zombie\n");
  50 }
  51
  52 static void read_config(int signalnum) {
  53         FILE *fp;
  54         int continuous_mode_seen = 0;
  55         struct swb_config_line line;
  56         char *default_browser = NULL, *logger_name = NULL;
  57
  58         set_config_defaults(&ctx);
  59
  60         if (!(fp = open_config_file()))
  61                 goto out_noopen;
  62
  63         /* Parse the config file
  64            TODO: should we handle errors differently than EOF? */
  65         if (!parse_config_file_begin())
  66                 goto out;
  67         while (!parse_config_file_line(fp, &line)) {
  68                 if (line.parsed) {
  69                         if (!strcmp(line.key, "continuous_mode")) {
  70                                 if (!continuous_mode_seen) {
  71                                         ctx.continuous_mode = atoi(line.value);
  72                                         continuous_mode_seen = 1;
  73                                 }
  74                                 free(line.value);
  75                         } else if (!strcmp(line.key, "default_browser")) {
  76                                 if (!default_browser)
  77                                         default_browser = line.value;
  78                         } else if (!strcmp(line.key, "other_browser_cmd")) {
  79                                 if (!ctx.other_browser_cmd)
  80                                         ctx.other_browser_cmd = line.value;
  81                         } else if (!strcmp(line.key, "logging")) {
  82                                 if (!logger_name)
  83                                         logger_name = line.value;
  84                         } else {
  85                                 /* Don't need this line's contents */
  86                                 free(line.value);
  87                         }
  88                 }
  89                 free(line.key);
  90         }
  91         parse_config_file_end();
  92
  93 out:
  94         fclose(fp);
  95 out_noopen:
  96         log_config(logger_name);
  97         update_default_browser(&ctx, default_browser);
  98
  99         log_msg("continuous_mode: %d\n", ctx.continuous_mode);
 100         log_msg("default_browser: '%s'\n",
 101                 default_browser?default_browser:"NULL");
 102         log_msg("other_browser_cmd: '%s'\n",
 103                 ctx.other_browser_cmd?ctx.other_browser_cmd:"NULL");
 104         log_msg("logging: '%s'\n",
 105                 logger_name?logger_name:"NULL");
 106
 107         free(logger_name);
 108         free(default_browser);
 109         return;
 110 }
 111
 112 int main() {
 113         OssoBrowser *obj_osso_browser, *obj_osso_browser_req;
 114         GMainLoop *mainloop;
 115         GError *error = NULL;
 116         int reqname_result;
 117
 118         read_config(0);
 119
 120         if (ctx.continuous_mode) {
 121                 /* Install signal handlers */
 122                 struct sigaction act;
 123                 act.sa_flags = SA_RESTART;
 124                 sigemptyset(&(act.sa_mask));
 125
 126                 /* SIGCHLD -- clean up after zombies */
 127                 act.sa_handler = waitforzombies;
 128                 if (sigaction(SIGCHLD, &act, NULL) == -1) {
 129                         log_msg("Installing signal handler failed\n");
 130                         return 1;
 131                 }
 132
 133                 /* SIGHUP -- reread config file */
 134                 act.sa_handler = read_config;
 135                 if (sigaction(SIGHUP, &act, NULL) == -1) {
 136                         log_msg("Installing signal handler failed\n");
 137                         return 1;
 138                 }
 139         }
 140
 141         g_type_init();
 142
 143         dbus_g_object_type_install_info(OSSO_BROWSER_TYPE,
 144                         &dbus_glib_osso_browser_object_info);
 145
 146         /* Get a connection to the D-Bus session bus */
 147         ctx.session_bus = dbus_g_bus_get(DBUS_BUS_SESSION, &error);
 148         if (!ctx.session_bus) {
 149                 log_msg("Couldn't get a D-Bus bus connection\n");
 150                 return 1;
 151         }
 152         ctx.dbus_proxy = dbus_g_proxy_new_for_name(ctx.session_bus,
 153                         "org.freedesktop.DBus", "/org/freedesktop/DBus",
 154                         "org.freedesktop.DBus");
 155         if (!ctx.dbus_proxy) {
 156                 log_msg("Couldn't get an org.freedesktop.DBus proxy\n");
 157                 return 1;
 158         }
 159
 160         /* Get the org.maemo.garage.browser-switchboard name from D-Bus, as
 161            a form of locking to ensure that not more than one
 162            browser-switchboard process is active at any time.  With
 163            DBUS_NAME_FLAG_DO_NOT_QUEUE set and DBUS_NAME_FLAG_REPLACE_EXISTING
 164            not set, getting the name succeeds if and only if no other
 165            process owns the name. */
 166         if (!dbus_g_proxy_call(ctx.dbus_proxy, "RequestName", &error,
 167                                G_TYPE_STRING, "org.maemo.garage.browser-switchboard",
 168                                G_TYPE_UINT, DBUS_NAME_FLAG_DO_NOT_QUEUE,
 169                                G_TYPE_INVALID,
 170                                G_TYPE_UINT, &reqname_result,
 171                                G_TYPE_INVALID)) {
 172                 log_msg("Couldn't acquire browser-switchboard lock: %s\n",
 173                         error->message);
 174                 return 1;
 175         }
 176         if (reqname_result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
 177                 log_msg("Another browser-switchboard already running\n");
 178                 return 1;
 179         }
 180
 181         dbus_request_osso_browser_name(&ctx);
 182
 183         /* Register ourselves to handle the osso_browser D-Bus methods */
 184         obj_osso_browser = g_object_new(OSSO_BROWSER_TYPE, NULL);
 185         obj_osso_browser_req = g_object_new(OSSO_BROWSER_TYPE, NULL);
 186         dbus_g_connection_register_g_object(ctx.session_bus,
 187                         "/com/nokia/osso_browser", G_OBJECT(obj_osso_browser));
 188         dbus_g_connection_register_g_object(ctx.session_bus,
 189                         "/com/nokia/osso_browser/request",
 190                         G_OBJECT(obj_osso_browser_req));
 191
 192         mainloop = g_main_loop_new(NULL, FALSE);
 193         log_msg("Starting main loop\n");
 194         g_main_loop_run(mainloop);
 195         log_msg("Main loop completed\n");
 196
 197         return 0;
 198 }