openbox/ping.c (raw)
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/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*- client.h for the Openbox window manager Copyright (c) 2006 Mikael Magnusson Copyright (c) 2003-2008 Dana Jansens This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. See the COPYING file for a copy of the GNU General Public License. */ #include "ping.h" #include "client.h" #include "prop.h" #include "event.h" #include "mainloop.h" #include "openbox.h" typedef struct _ObPingTarget { ObClient *client; ObPingEventHandler h; Time sent; gint waiting; } ObPingTarget; static GSList *ping_targets = NULL; static gboolean active = FALSE; #define PING_TIMEOUT (G_USEC_PER_SEC * 3) /*! Warn the user after this many PING_TIMEOUT intervals */ #define PING_TIMEOUT_WARN 3 static void ping_send(ObPingTarget *t); static void ping_end(ObClient *client, gpointer data); static gboolean ping_timeout(gpointer data); void ping_start(struct _ObClient *client, ObPingEventHandler h) { GSList *it; ObPingTarget *t; g_assert(client->ping == TRUE); /* make sure we're not already pinging it */ for (it = ping_targets; it != NULL; it = g_slist_next(it)) { t = it->data; if (t->client == client) return; } t = g_new(ObPingTarget, 1); t->client = client; t->h = h; t->waiting = 1; /* first wait for a reply */ ping_send(t); ping_targets = g_slist_prepend(ping_targets, t); ob_main_loop_timeout_add(ob_main_loop, PING_TIMEOUT, ping_timeout, t, NULL, NULL); if (!active) { active = TRUE; /* listen for the client to disappear */ client_add_destroy_notify(ping_end, NULL); } } void ping_stop(struct _ObClient *c) { ping_end(c, NULL); } void ping_got_pong(Time timestamp) { GSList *it; ObPingTarget *t; /* make sure we're not already pinging it */ for (it = ping_targets; it != NULL; it = g_slist_next(it)) { t = it->data; if (t->sent == timestamp) { /*ob_debug("Got PONG with timestamp %lu\n", timestamp);*/ if (t->waiting > PING_TIMEOUT_WARN) { /* we had notified that they weren't responding, so now we need to notify that they are again */ t->h(t->client, FALSE); } t->waiting = 0; /* not waiting for a reply anymore */ break; } } if (it == NULL) ob_debug("Got PONG with timestamp %lu but not waiting for one\n", timestamp); } static void ping_send(ObPingTarget *t) { t->sent = event_get_server_time(); /*ob_debug("PINGing client 0x%x at %lu\n", t->client->window, t->sent);*/ PROP_MSG_TO(t->client->window, t->client->window, wm_protocols, prop_atoms.net_wm_ping, t->sent, t->client->window, 0, 0, NoEventMask); } static gboolean ping_timeout(gpointer data) { ObPingTarget *t = data; if (t->waiting == 0) { /* got a reply already */ /* send another ping to make sure it's still alive */ ping_send(t); } if (t->waiting == PING_TIMEOUT_WARN) t->h(t->client, TRUE); /* notify that the client isn't responding */ ++t->waiting; return TRUE; /* repeat */ } static void ping_end(ObClient *client, gpointer data) { GSList *it; ObPingTarget *t; for (it = ping_targets; it != NULL; it = g_slist_next(it)) { t = it->data; if (t->client == client) { ping_targets = g_slist_remove_link(ping_targets, it); ob_main_loop_timeout_remove_data(ob_main_loop, ping_timeout, t, FALSE); g_free(t); break; } } /* stop listening if we're not waiting for any more pings */ if (!ping_targets) { active = TRUE; client_remove_destroy_notify(ping_end); } } |