Dogcows Code - chaz/openbox/blob - openbox/ping.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    client.h for the Openbox window manager
   4    Copyright (c) 2006        Mikael Magnusson
   5    Copyright (c) 2003-2008   Dana Jansens
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (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    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "ping.h"
  21 #include "client.h"
  22 #include "prop.h"
  23 #include "event.h"
  24 #include "debug.h"
  25 #include "mainloop.h"
  26 #include "openbox.h"
  27
  28 typedef struct _ObPingTarget
  29 {
  30     ObClient *client;
  31     ObPingEventHandler h;
  32     Time sent;
  33     gint waiting;
  34 } ObPingTarget;
  35
  36 static GSList *ping_targets = NULL;
  37 static gboolean active = FALSE;
  38
  39 #define PING_TIMEOUT (G_USEC_PER_SEC * 3)
  40 /*! Warn the user after this many PING_TIMEOUT intervals */
  41 #define PING_TIMEOUT_WARN 3
  42
  43 static void ping_send(ObPingTarget *t);
  44 static void ping_end(ObClient *client, gpointer data);
  45 static gboolean ping_timeout(gpointer data);
  46
  47 void ping_start(struct _ObClient *client, ObPingEventHandler h)
  48 {
  49     GSList *it;
  50     ObPingTarget *t;
  51
  52     g_assert(client->ping == TRUE);
  53
  54     /* make sure we're not already pinging it */
  55     for (it = ping_targets; it != NULL; it = g_slist_next(it)) {
  56         t = it->data;
  57         if (t->client == client) return;
  58     }
  59
  60     t = g_new(ObPingTarget, 1);
  61     t->client = client;
  62     t->h = h;
  63     t->waiting = 1; /* first wait for a reply */
  64
  65     ping_send(t);
  66     ping_targets = g_slist_prepend(ping_targets, t);
  67     ob_main_loop_timeout_add(ob_main_loop, PING_TIMEOUT, ping_timeout,
  68                              t, g_direct_equal, NULL);
  69
  70     if (!active) {
  71         active = TRUE;
  72         /* listen for the client to disappear */
  73         client_add_destroy_notify(ping_end, NULL);
  74     }
  75 }
  76
  77 void ping_stop(struct _ObClient *c)
  78 {
  79     ping_end(c, NULL);
  80 }
  81
  82 void ping_got_pong(Time timestamp)
  83 {
  84     GSList *it;
  85     ObPingTarget *t;
  86
  87     /* make sure we're not already pinging it */
  88     for (it = ping_targets; it != NULL; it = g_slist_next(it)) {
  89         t = it->data;
  90         if (t->sent == timestamp) {
  91             /*ob_debug("PONG: '%s' (timestamp %lu)\n", t->client->title,
  92                      t->sent);*/
  93             if (t->waiting > PING_TIMEOUT_WARN) {
  94                 /* we had notified that they weren't responding, so now we
  95                    need to notify that they are again */
  96                 t->h(t->client, FALSE);
  97             }
  98             t->waiting = 0; /* not waiting for a reply anymore */
  99             break;
 100         }
 101     }
 102
 103     if (it == NULL)
 104         ob_debug("Got PONG with timestamp %lu but not waiting for one\n",
 105                  timestamp);
 106 }
 107
 108 static void ping_send(ObPingTarget *t)
 109 {
 110     t->sent = event_get_server_time();
 111     /*ob_debug("PING: '%s' (timestamp %lu)\n", t->client->title, t->sent);*/
 112     PROP_MSG_TO(t->client->window, t->client->window, wm_protocols,
 113                 prop_atoms.net_wm_ping, t->sent, t->client->window, 0, 0,
 114                 NoEventMask);
 115 }
 116
 117 static gboolean ping_timeout(gpointer data)
 118 {
 119     ObPingTarget *t = data;
 120
 121     if (t->waiting == 0) { /* got a reply already */
 122         /* send another ping to make sure it's still alive */
 123         ping_send(t);
 124     }
 125
 126     if (t->waiting == PING_TIMEOUT_WARN)
 127         t->h(t->client, TRUE); /* notify that the client isn't responding */
 128
 129     ++t->waiting;
 130
 131     return TRUE; /* repeat */
 132 }
 133
 134 static void ping_end(ObClient *client, gpointer data)
 135 {
 136     GSList *it;
 137     ObPingTarget *t;
 138
 139     for (it = ping_targets; it != NULL; it = g_slist_next(it)) {
 140         t = it->data;
 141         if (t->client == client) {
 142             ping_targets = g_slist_remove_link(ping_targets, it);
 143             ob_main_loop_timeout_remove_data(ob_main_loop, ping_timeout, t,
 144                                              FALSE);
 145             g_free(t);
 146             break;
 147         }
 148     }
 149
 150     /* stop listening if we're not waiting for any more pings */
 151     if (!ping_targets) {
 152         active = FALSE;
 153         client_remove_destroy_notify(ping_end);
 154     }
 155 }