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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- */
/* - Library for asynchronous communication
* Copyright (C) 2002 Søren Sandmann (sandmann@daimi.au.dk)
*
* This library 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 library 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
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <glib.h>
#include "watch.h"
typedef struct Watch Watch;
struct Watch {
GSource source;
GPollFD poll_fd;
gboolean removed;
WatchCallback read_callback;
WatchCallback write_callback;
WatchCallback hangup_callback;
WatchCallback error_callback;
WatchCallback priority_callback;
gpointer data;
};
static GHashTable *watched_fds;
static void
init (void)
{
if (!watched_fds)
watched_fds = g_hash_table_new (g_int_hash, g_int_equal);
}
static Watch *
lookup_watch (gint fd)
{
init ();
return g_hash_table_lookup (watched_fds, &fd);
}
static void
internal_add_watch (Watch *watch)
{
gpointer fd = &(watch->poll_fd.fd);
init ();
g_hash_table_insert (watched_fds, fd, watch);
g_source_add_poll ((GSource *)watch, &(watch->poll_fd));
}
static void
internal_remove_watch (Watch *watch)
{
gpointer fd = &(watch->poll_fd.fd);
init ();
watch->removed = TRUE;
g_source_remove_poll ((GSource *)watch, &(watch->poll_fd));
g_hash_table_remove (watched_fds, fd);
}
static gboolean
watch_prepare (GSource *source,
gint *timeout)
{
*timeout = -1;
return FALSE;
}
static gboolean
watch_check (GSource *source)
{
Watch *watch = (Watch *)source;
gint revents = watch->poll_fd.revents;
if (revents & (G_IO_NVAL))
{
/* This can happen if the user closes the file descriptor
* without first removing the watch. We silently ignore it
*/
internal_remove_watch (watch);
g_source_unref (source);
return FALSE;
}
if ((revents & G_IO_HUP) && watch->hangup_callback)
return TRUE;
if ((revents & G_IO_IN) && watch->read_callback)
return TRUE;
if ((revents & G_IO_PRI) && watch->priority_callback)
return TRUE;
if ((revents & G_IO_ERR) && watch->error_callback)
return TRUE;
if ((revents & G_IO_OUT) && watch->write_callback)
return TRUE;
return FALSE;
}
static gboolean
watch_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
Watch *watch = (Watch *)source;
gint revents = watch->poll_fd.revents;
gboolean removed;
g_source_ref (source);
if (!watch->removed && (revents & G_IO_IN) && watch->read_callback)
watch->read_callback (watch->data);
if (!watch->removed && (revents & G_IO_PRI) && watch->priority_callback)
watch->priority_callback (watch->data);
if (!watch->removed && (revents & G_IO_OUT) && watch->write_callback)
watch->write_callback (watch->data);
if (!watch->removed && (revents & G_IO_ERR) && watch->error_callback)
watch->error_callback (watch->data);
if (!watch->removed && (revents & G_IO_HUP) && watch->hangup_callback)
watch->hangup_callback (watch->data);
removed = watch->removed;
g_source_unref (source);
if (removed)
return FALSE;
return TRUE;
}
static void
watch_finalize (GSource *source)
{
}
static void
update_poll_mask (Watch *watch)
{
gint events = 0;
g_source_remove_poll ((GSource *)watch, &(watch->poll_fd));
if (watch->read_callback)
events |= G_IO_IN;
if (watch->write_callback)
events |= G_IO_OUT;
if (watch->priority_callback)
events |= G_IO_PRI;
if (watch->hangup_callback)
events |= G_IO_HUP;
if (watch->error_callback)
events |= G_IO_ERR;
watch->poll_fd.events = events;
g_source_add_poll ((GSource *)watch, &(watch->poll_fd));
}
void
fd_add_watch (gint fd,
gpointer data)
{
static GSourceFuncs watch_funcs = {
watch_prepare,
watch_check,
watch_dispatch,
watch_finalize,
};
Watch *watch = lookup_watch (fd);
g_return_if_fail (fd > 0);
g_return_if_fail (watch == NULL);
watch = (Watch *)g_source_new (&watch_funcs, sizeof (Watch));
g_source_set_can_recurse ((GSource *)watch, TRUE);
g_source_attach ((GSource *)watch, NULL);
watch->poll_fd.fd = fd;
watch->poll_fd.events = 0;
watch->removed = FALSE;
watch->read_callback = NULL;
watch->write_callback = NULL;
watch->hangup_callback = NULL;
watch->error_callback = NULL;
watch->priority_callback = NULL;
watch->data = data;
internal_add_watch (watch);
}
void
fd_set_read_callback (gint fd,
WatchCallback read_cb)
{
Watch *watch = lookup_watch (fd);
g_return_if_fail (fd > 0);
g_return_if_fail (watch != NULL);
if (watch->read_callback != read_cb)
{
watch->read_callback = read_cb;
update_poll_mask (watch);
}
}
void
fd_set_write_callback (gint fd,
WatchCallback write_cb)
{
Watch *watch = lookup_watch (fd);
g_return_if_fail (fd > 0);
g_return_if_fail (watch != NULL);
if (watch->write_callback != write_cb)
{
watch->write_callback = write_cb;
update_poll_mask (watch);
}
}
void
fd_set_hangup_callback (gint fd,
WatchCallback hangup_cb)
{
Watch *watch = lookup_watch (fd);
g_return_if_fail (fd > 0);
g_return_if_fail (watch != NULL);
if (watch->hangup_callback != hangup_cb)
{
watch->hangup_callback = hangup_cb;
update_poll_mask (watch);
}
}
void
fd_set_error_callback (gint fd,
WatchCallback error_cb)
{
Watch *watch = lookup_watch (fd);
g_return_if_fail (fd > 0);
g_return_if_fail (watch != NULL);
if (watch->error_callback != error_cb)
{
watch->error_callback = error_cb;
update_poll_mask (watch);
}
}
void
fd_set_priority_callback (gint fd,
WatchCallback priority_cb)
{
Watch *watch = lookup_watch (fd);
g_return_if_fail (fd > 0);
g_return_if_fail (watch != NULL);
if (watch->priority_callback != priority_cb)
{
watch->priority_callback = priority_cb;
update_poll_mask (watch);
}
}
void
fd_remove_watch (gint fd)
{
Watch *watch = lookup_watch (fd);
g_return_if_fail (fd > 0);
if (!watch)
return;
internal_remove_watch (watch);
g_source_unref ((GSource *)watch);
}
gboolean
fd_is_watched (gint fd)
{
g_return_val_if_fail (fd > 0, FALSE);
if (lookup_watch (fd))
return TRUE;
else
return FALSE;
}
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