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/* -*- mode: C; c-file-style: "gnu" -*- */
/* loop.c Main loop for daemon
*
* Copyright (C) 2003 Red Hat, Inc.
*
* Licensed under the Academic Free License version 1.2
*
* 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
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "loop.h"
#include <dbus/dbus-list.h>
#include <dbus/dbus-sysdeps.h>
static DBusList *watches = NULL;
static int watch_list_serial = 0;
static dbus_bool_t exited = FALSE;
typedef struct
{
DBusWatch *watch;
BusWatchFunction function;
void *data;
DBusFreeFunction free_data_func;
} WatchCallback;
dbus_bool_t
bus_loop_add_watch (DBusWatch *watch,
BusWatchFunction function,
void *data,
DBusFreeFunction free_data_func)
{
WatchCallback *cb;
cb = dbus_new (WatchCallback, 1);
if (cb == NULL)
return FALSE;
cb->watch = watch;
cb->function = function;
cb->data = data;
cb->free_data_func = free_data_func;
if (!_dbus_list_append (&watches, cb))
{
dbus_free (cb);
return FALSE;
}
watch_list_serial += 1;
return TRUE;
}
void
bus_loop_remove_watch (DBusWatch *watch,
BusWatchFunction function,
void *data)
{
DBusList *link;
link = _dbus_list_get_first_link (&watches);
while (link != NULL)
{
DBusList *next = _dbus_list_get_next_link (&watches, link);
WatchCallback *cb = link->data;
if (cb->watch == watch &&
cb->function == function &&
cb->data == data)
{
_dbus_list_remove_link (&watches, link);
watch_list_serial += 1;
if (cb->free_data_func)
(* cb->free_data_func) (cb->data);
dbus_free (cb);
return;
}
link = next;
}
_dbus_warn ("could not find watch %p function %p data %p to remove\n",
watch, function, data);
}
static void
wait_for_memory (void)
{
_dbus_sleep_milliseconds (500);
}
void
bus_loop_run (void)
{
while (!exited)
{
DBusPollFD *fds;
int n_fds;
WatchCallback **watches_for_fds;
int i;
DBusList *link;
int n_ready;
int initial_serial;
fds = NULL;
watches_for_fds = NULL;
n_fds = _dbus_list_get_length (&watches);
if (n_fds == 0)
{
bus_loop_quit ();
goto next_iteration;
}
fds = dbus_new0 (DBusPollFD, n_fds);
while (fds == NULL)
{
wait_for_memory ();
fds = dbus_new0 (DBusPollFD, n_fds);
}
watches_for_fds = dbus_new (WatchCallback*, n_fds);
while (watches_for_fds == NULL)
{
wait_for_memory ();
watches_for_fds = dbus_new (WatchCallback*, n_fds);
}
i = 0;
link = _dbus_list_get_first_link (&watches);
while (link != NULL)
{
DBusList *next = _dbus_list_get_next_link (&watches, link);
WatchCallback *cb = link->data;
int flags;
watches_for_fds[i] = cb;
flags = dbus_watch_get_flags (cb->watch);
fds[i].fd = dbus_watch_get_fd (cb->watch);
if (flags & DBUS_WATCH_READABLE)
fds[i].events |= _DBUS_POLLIN;
if (flags & DBUS_WATCH_WRITABLE)
fds[i].events |= _DBUS_POLLOUT;
link = next;
++i;
}
n_ready = _dbus_poll (fds, n_fds, -1);
if (n_ready > 0)
{
initial_serial = watch_list_serial;
i = 0;
while (i < n_fds)
{
/* FIXME I think this "restart if we change the watches"
* approach could result in starving watches
* toward the end of the list.
*/
if (initial_serial != watch_list_serial)
goto next_iteration;
if (exited)
goto next_iteration;
if (fds[i].revents != 0)
{
WatchCallback *cb;
unsigned int condition;
cb = watches_for_fds[i];
condition = 0;
if (fds[i].revents & _DBUS_POLLIN)
condition |= DBUS_WATCH_READABLE;
if (fds[i].revents & _DBUS_POLLOUT)
condition |= DBUS_WATCH_WRITABLE;
if (fds[i].revents & _DBUS_POLLHUP)
condition |= DBUS_WATCH_HANGUP;
if (fds[i].revents & _DBUS_POLLERR)
condition |= DBUS_WATCH_ERROR;
/* condition may still be 0 if we got some
* weird POLLFOO thing like POLLWRBAND
*/
if (condition != 0)
(* cb->function) (cb->watch,
condition,
cb->data);
}
++i;
}
}
next_iteration:
dbus_free (fds);
dbus_free (watches_for_fds);
}
}
void
bus_loop_quit (void)
{
exited = TRUE;
}
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