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 "mainloop.h"
  25 #include "openbox.h"
  26
  27 typedef struct _ObPingTarget
  28 {
  29     ObClient *client;
  30     ObPingEventHandler h;
  31     Time sent;
  32     gint waiting;
  33 } ObPingTarget;
  34
  35 static GSList *ping_targets = NULL;
  36 static gboolean active = FALSE;
  37
  38 #define PING_TIMEOUT (G_USEC_PER_SEC * 1)
  39 /*! Warn the user after this many PING_TIMEOUT intervals */
  40 #define PING_TIMEOUT_WARN 3
  41
  42 static void ping_send(ObPingTarget *t);
  43 static void ping_end(ObClient *client, gpointer data);
  44 static gboolean ping_timeout(gpointer data);
  45
  46 void ping_start(struct _ObClient *client, ObPingEventHandler h)
  47 {
  48     GSList *it;
  49     ObPingTarget *t;
  50
  51     /* make sure we're not already pinging it */
  52     for (it = ping_targets; it != NULL; it = g_slist_next(it)) {
  53         t = it->data;
  54         if (t->client == client) return;
  55     }
  56
  57     t = g_new(ObPingTarget, 1);
  58     t->client = client;
  59     t->h = h;
  60     t->waiting = 1; /* first wait for a reply */
  61
  62     ping_send(t);
  63     ping_targets = g_slist_prepend(ping_targets, t);
  64     ob_main_loop_timeout_add(ob_main_loop, PING_TIMEOUT, ping_timeout,
  65                              t, NULL, NULL);
  66
  67     if (!active) {
  68         active = TRUE;
  69         /* listen for the client to disappear */
  70         client_add_destroy_notify(ping_end, NULL);
  71     }
  72 }
  73
  74 void ping_stop(struct _ObClient *c)
  75 {
  76     ping_end(c, NULL);
  77 }
  78
  79 void ping_got_pong(Time timestamp)
  80 {
  81     GSList *it;
  82     ObPingTarget *t;
  83
  84     /* make sure we're not already pinging it */
  85     for (it = ping_targets; it != NULL; it = g_slist_next(it)) {
  86         t = it->data;
  87         if (t->sent == timestamp) {
  88             ob_debug("Got PONG with timestamp %lu\n", timestamp);
  89             if (t->waiting > PING_TIMEOUT_WARN) {
  90                 /* we had notified that they weren't responding, so now we
  91                    need to notify that they are again */
  92                 t->h(t->client, FALSE);
  93             }
  94             t->waiting = 0; /* not waiting for a reply anymore */
  95             break;
  96         }
  97     }
  98
  99     if (it == NULL)
 100         ob_debug("Got PONG with timestamp %lu but not waiting for one\n",
 101                  timestamp);
 102 }
 103
 104 static void ping_send(ObPingTarget *t)
 105 {
 106     t->sent = event_get_server_time();
 107     ob_debug("PINGing client 0x%x at %lu\n", t->client->window, t->sent);
 108     PROP_MSG_TO(t->client->window, t->client->window, wm_protocols,
 109                 prop_atoms.net_wm_ping, t->sent, t->client->window, 0, 0,
 110                 NoEventMask);
 111 }
 112
 113 static gboolean ping_timeout(gpointer data)
 114 {
 115     ObPingTarget *t = data;
 116
 117     if (t->waiting == 0) { /* got a reply already */
 118         /* send another ping to make sure it's still alive */
 119         ping_send(t);
 120     }
 121
 122     if (t->waiting == PING_TIMEOUT_WARN)
 123         t->h(t->client, TRUE); /* notify that the client isn't responding */
 124
 125     ++t->waiting;
 126
 127     return TRUE; /* repeat */
 128 }
 129
 130 static void ping_end(ObClient *client, gpointer data)
 131 {
 132     GSList *it;
 133     ObPingTarget *t;
 134
 135     for (it = ping_targets; it != NULL; it = g_slist_next(it)) {
 136         t = it->data;
 137         if (t->client == client) {
 138             ping_targets = g_slist_remove_link(ping_targets, it);
 139             ob_main_loop_timeout_remove_data(ob_main_loop, ping_timeout, t,
 140                                              FALSE);
 141             g_free(t);
 142             break;
 143         }
 144     }
 145
 146     /* stop listening if we're not waiting for any more pings */
 147     if (!ping_targets) {
 148         active = TRUE;
 149         client_remove_destroy_notify(ping_end);
 150     }
 151 }