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-rw-r--r--lib/events_libevent.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/lib/events_libevent.c b/lib/events_libevent.c
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--- /dev/null
+++ b/lib/events_libevent.c
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+ /********************************************************************\
+ * BitlBee -- An IRC to other IM-networks gateway *
+ * *
+ * Copyright 2002-2006 Wilmer van der Gaast and others *
+ \********************************************************************/
+
+/*
+ * Event handling (using libevent)
+ */
+
+/*
+ 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.
+
+ You should have received a copy of the GNU General Public License with
+ the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
+ if not, write to the Free Software Foundation, Inc., 59 Temple Place,
+ Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#define BITLBEE_CORE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <event.h>
+#include "proxy.h"
+
+static void b_main_restart();
+static guint id_next = 1;
+static GHashTable *id_hash;
+static int quitting = 0;
+
+/* Since libevent doesn't handle two event handlers for one fd-condition
+ very well (which happens sometimes when BitlBee changes event handlers
+ for a combination), let's buid some indexes so we can delete them here
+ already, just in time. */
+static GHashTable *read_hash;
+static GHashTable *write_hash;
+
+struct event_base *leh;
+struct event_base *old_leh;
+
+struct b_event_data
+{
+ guint id;
+ struct event evinfo;
+ gint timeout;
+ b_event_handler function;
+ void *data;
+};
+
+void b_main_init()
+{
+ if( leh != NULL )
+ {
+ /* Clean up the hash tables? */
+
+ b_main_restart();
+ old_leh = leh;
+ }
+
+ leh = event_init();
+
+ id_hash = g_hash_table_new( g_int_hash, g_int_equal );
+ read_hash = g_hash_table_new( g_int_hash, g_int_equal );
+ write_hash = g_hash_table_new( g_int_hash, g_int_equal );
+}
+
+void b_main_run()
+{
+ /* This while loop is necessary to exit the event loop and start a
+ different one (necessary for ForkDaemon mode). */
+ while( event_base_dispatch( leh ) == 0 && !quitting )
+ {
+ if( old_leh != NULL )
+ {
+ /* For some reason this just isn't allowed...
+ Possibly a bug in older versions, will see later.
+ event_base_free( old_leh ); */
+ old_leh = NULL;
+ }
+
+ event_debug( "New event loop.\n" );
+ }
+}
+
+static void b_main_restart()
+{
+ struct timeval tv;
+
+ memset( &tv, 0, sizeof( struct timeval ) );
+ event_base_loopexit( leh, &tv );
+
+ event_debug( "b_main_restart()\n" );
+}
+
+void b_main_quit()
+{
+ /* Tell b_main_run() that it shouldn't restart the loop. Also,
+ libevent sometimes generates events before really quitting,
+ we want to stop them. */
+ quitting = 1;
+
+ b_main_restart();
+}
+
+static void b_event_passthrough( int fd, short event, void *data )
+{
+ struct b_event_data *b_ev = data;
+ b_input_condition cond = 0;
+ int id;
+
+ if( fd >= 0 )
+ {
+ if( event & EV_READ )
+ cond |= GAIM_INPUT_READ;
+ if( event & EV_WRITE )
+ cond |= GAIM_INPUT_WRITE;
+ }
+
+ event_debug( "b_event_passthrough( %d, %d, 0x%x ) (%d)\n", fd, event, (int) data, b_ev->id );
+
+ /* Since the called function might cancel this handler already
+ (which free()s b_ev), we have to remember the ID here. */
+ id = b_ev->id;
+
+ if( quitting )
+ {
+ b_event_remove( id );
+ return;
+ }
+
+ if( !b_ev->function( b_ev->data, fd, cond ) )
+ {
+ event_debug( "Handler returned FALSE: " );
+ b_event_remove( id );
+ }
+ else if( fd == -1 )
+ {
+ struct timeval tv;
+
+ tv.tv_sec = b_ev->timeout / 1000;
+ tv.tv_usec = ( b_ev->timeout % 1000 ) * 1000;
+
+ evtimer_add( &b_ev->evinfo, &tv );
+ }
+}
+
+gint b_input_add( gint fd, b_input_condition condition, b_event_handler function, gpointer data )
+{
+ struct b_event_data *b_ev;
+
+ event_debug( "b_input_add( %d, %d, 0x%x, 0x%x ) ", fd, condition, function, data );
+
+ if( ( condition & GAIM_INPUT_READ && ( b_ev = g_hash_table_lookup( read_hash, &fd ) ) ) ||
+ ( condition & GAIM_INPUT_WRITE && ( b_ev = g_hash_table_lookup( write_hash, &fd ) ) ) )
+ {
+ /* We'll stick with this libevent entry, but give it a new BitlBee id. */
+ g_hash_table_remove( id_hash, &b_ev->id );
+
+ event_debug( "(replacing old handler (id = %d)) = %d\n", b_ev->id, id_next );
+
+ b_ev->id = id_next++;
+ b_ev->function = function;
+ b_ev->data = data;
+ }
+ else
+ {
+ GIOCondition out_cond;
+
+ event_debug( "(new) = %d\n", id_next );
+
+ b_ev = g_new0( struct b_event_data, 1 );
+ b_ev->id = id_next++;
+ b_ev->function = function;
+ b_ev->data = data;
+
+ out_cond = EV_PERSIST;
+ if( condition & GAIM_INPUT_READ )
+ out_cond |= EV_READ;
+ if( condition & GAIM_INPUT_WRITE )
+ out_cond |= EV_WRITE;
+
+ event_set( &b_ev->evinfo, fd, out_cond, b_event_passthrough, b_ev );
+ event_add( &b_ev->evinfo, NULL );
+
+ if( out_cond & EV_READ )
+ g_hash_table_insert( read_hash, &b_ev->evinfo.ev_fd, b_ev );
+ if( out_cond & EV_WRITE )
+ g_hash_table_insert( write_hash, &b_ev->evinfo.ev_fd, b_ev );
+ }
+
+ g_hash_table_insert( id_hash, &b_ev->id, b_ev );
+ return b_ev->id;
+}
+
+/* TODO: Persistence for timers! */
+gint b_timeout_add( gint timeout, b_event_handler function, gpointer data )
+{
+ struct b_event_data *b_ev = g_new0( struct b_event_data, 1 );
+ struct timeval tv;
+
+ b_ev->id = id_next++;
+ b_ev->timeout = timeout;
+ b_ev->function = function;
+ b_ev->data = data;
+
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = ( timeout % 1000 ) * 1000;
+
+ evtimer_set( &b_ev->evinfo, b_event_passthrough, b_ev );
+ evtimer_add( &b_ev->evinfo, &tv );
+
+ event_debug( "b_timeout_add( %d, 0x%x, 0x%x ) = %d\n", timeout, function, data, b_ev->id );
+
+ g_hash_table_insert( id_hash, &b_ev->id, b_ev );
+
+ return b_ev->id;
+}
+
+void b_event_remove( gint id )
+{
+ struct b_event_data *b_ev = g_hash_table_lookup( id_hash, &id );
+
+ event_debug( "b_event_remove( %d )\n", id );
+ if( b_ev )
+ {
+ g_hash_table_remove( id_hash, &b_ev->id );
+ if( b_ev->evinfo.ev_fd >= 0 )
+ {
+ if( b_ev->evinfo.ev_events & EV_READ )
+ g_hash_table_remove( read_hash, &b_ev->evinfo.ev_fd );
+ if( b_ev->evinfo.ev_events & EV_WRITE )
+ g_hash_table_remove( write_hash, &b_ev->evinfo.ev_fd );
+ }
+
+ event_del( &b_ev->evinfo );
+ g_free( b_ev );
+ }
+ else
+ {
+ event_debug( "Already removed?\n" );
+ }
+}
+
+void closesocket( int fd )
+{
+ struct b_event_data *b_ev;
+
+ /* Since epoll() (the main reason we use libevent) automatically removes sockets from
+ the epoll() list when a socket gets closed and some modules have a habit of
+ closing sockets before removing event handlers, our and libevent's administration
+ get a little bit messed up. So this little function will remove the handlers
+ properly before closing a socket. */
+
+ if( ( b_ev = g_hash_table_lookup( read_hash, &fd ) ) )
+ {
+ event_debug( "Warning: fd %d still had a read event handler when shutting down.\n", fd );
+ b_event_remove( b_ev->id );
+ }
+ if( ( b_ev = g_hash_table_lookup( write_hash, &fd ) ) )
+ {
+ event_debug( "Warning: fd %d still had a write event handler when shutting down.\n", fd );
+ b_event_remove( b_ev->id );
+ }
+
+ close( fd );
+}
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