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     guint32 id;
  33     gint waiting;
  34 } ObPingTarget;
  35
  36 static GHashTable *ping_ids     = NULL;
  37 static guint32     ping_next_id = 1;
  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 static gboolean find_client(gpointer key, gpointer value, gpointer client);
  47
  48 void ping_startup(gboolean reconfigure)
  49 {
  50     if (reconfigure) return;
  51
  52     ping_ids = g_hash_table_new(g_direct_hash, g_int_equal);
  53
  54     /* listen for clients to disappear */
  55     client_add_destroy_notify(ping_end, NULL);
  56 }
  57
  58 void ping_shutdown(gboolean reconfigure)
  59 {
  60     if (reconfigure) return;
  61
  62     g_hash_table_unref(ping_ids);
  63
  64     client_remove_destroy_notify(ping_end);
  65 }
  66
  67 void ping_start(struct _ObClient *client, ObPingEventHandler h)
  68 {
  69     ObPingTarget *t;
  70
  71     g_assert(g_hash_table_find(ping_ids, find_client, client) == NULL);
  72
  73     g_assert(client->ping == TRUE);
  74
  75     t = g_new0(ObPingTarget, 1);
  76     t->client = client;
  77     t->h = h;
  78
  79     ob_main_loop_timeout_add(ob_main_loop, PING_TIMEOUT, ping_timeout,
  80                              t, g_direct_equal, NULL);
  81     /* act like we just timed out immediately, to start the pinging process
  82        now instead of after the first delay */
  83     ping_timeout(t);
  84 }
  85
  86 void ping_stop(struct _ObClient *c)
  87 {
  88     ping_end(c, NULL);
  89 }
  90
  91 void ping_got_pong(guint32 id)
  92 {
  93     ObPingTarget *t;
  94
  95     if ((t = g_hash_table_lookup(ping_ids, &id))) {
  96         /*g_print("-PONG: '%s' (id %u)\n", t->client->title, t->id);*/
  97         if (t->waiting > PING_TIMEOUT_WARN) {
  98             /* we had notified that they weren't responding, so now we
  99                need to notify that they are again */
 100             t->h(t->client, FALSE);
 101         }
 102         t->waiting = 0; /* not waiting for a reply anymore */
 103     }
 104     else
 105         ob_debug("Got PONG with id %u but not waiting for one\n", id);
 106 }
 107
 108 static gboolean find_client(gpointer key, gpointer value, gpointer client)
 109 {
 110     ObPingTarget *t = value;
 111     return t->client == client;
 112 }
 113
 114 static void ping_send(ObPingTarget *t)
 115 {
 116     /* t->id is 0 when it hasn't been assigned an id ever yet.
 117        we can reuse ids when t->waiting == 0, because we won't be getting a
 118        pong for that id in the future again.  that way for apps that aren't
 119        timing out we don't need to remove/add them from/to the hash table */
 120     if (t->id == 0 || t->waiting > 0) {
 121         /* pick an id, and reinsert in the hash table with the new id */
 122         if (t->id) g_hash_table_remove(ping_ids, &t->id);
 123         t->id = ping_next_id;
 124         if (++ping_next_id == 0) ++ping_next_id; /* skip 0 on wraparound */
 125         g_hash_table_insert(ping_ids, &t->id, t);
 126     }
 127
 128     /*g_print("+PING: '%s' (id %u)\n", t->client->title, t->id);*/
 129     PROP_MSG_TO(t->client->window, t->client->window, wm_protocols,
 130                 prop_atoms.net_wm_ping, t->id, t->client->window, 0, 0,
 131                 NoEventMask);
 132 }
 133
 134 static gboolean ping_timeout(gpointer data)
 135 {
 136     ObPingTarget *t = data;
 137
 138     ping_send(t);
 139
 140     /* if the client hasn't been responding then do something about it */
 141     if (t->waiting == PING_TIMEOUT_WARN)
 142         t->h(t->client, TRUE); /* notify that the client isn't responding */
 143
 144     ++t->waiting;
 145
 146     return TRUE; /* repeat */
 147 }
 148
 149 static void ping_end(ObClient *client, gpointer data)
 150 {
 151     ObPingTarget *t;
 152
 153     t = g_hash_table_find(ping_ids, find_client, client);
 154     g_assert (t != NULL);
 155
 156     g_hash_table_remove(ping_ids, &t->id);
 157
 158     ob_main_loop_timeout_remove_data(ob_main_loop, ping_timeout, t, FALSE);
 159
 160     g_free(t);
 161 }