2009-03-13 18:43:16 +01:00
|
|
|
/*
|
2010-01-01 05:55:13 +01:00
|
|
|
* Copyright (C) 2003-2010 The Music Player Daemon Project
|
2009-03-13 18:43:16 +01:00
|
|
|
* http://www.musicpd.org
|
2008-04-12 11:46:11 +02:00
|
|
|
*
|
|
|
|
* 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.
|
2009-03-13 18:43:16 +01:00
|
|
|
*
|
|
|
|
* 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.,
|
|
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
2008-04-12 11:46:11 +02:00
|
|
|
*/
|
|
|
|
|
2009-11-12 09:12:38 +01:00
|
|
|
#include "config.h"
|
2009-01-01 18:12:00 +01:00
|
|
|
#include "event_pipe.h"
|
2009-11-07 18:55:16 +01:00
|
|
|
#include "fd_util.h"
|
2010-09-25 15:00:43 +02:00
|
|
|
#include "mpd_error.h"
|
2008-04-12 11:46:11 +02:00
|
|
|
|
2009-01-03 14:53:39 +01:00
|
|
|
#include <stdbool.h>
|
2008-10-08 10:49:29 +02:00
|
|
|
#include <assert.h>
|
2008-11-24 14:32:02 +01:00
|
|
|
#include <glib.h>
|
2008-10-08 10:49:29 +02:00
|
|
|
#include <string.h>
|
2009-01-03 14:53:42 +01:00
|
|
|
#include <errno.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <unistd.h>
|
2008-10-08 10:49:29 +02:00
|
|
|
|
2009-01-03 13:22:55 +01:00
|
|
|
#ifdef WIN32
|
|
|
|
/* for _O_BINARY */
|
|
|
|
#include <fcntl.h>
|
|
|
|
#endif
|
|
|
|
|
2009-02-19 09:24:59 +01:00
|
|
|
#undef G_LOG_DOMAIN
|
|
|
|
#define G_LOG_DOMAIN "event_pipe"
|
|
|
|
|
2009-01-01 18:12:14 +01:00
|
|
|
static int event_pipe[2];
|
2010-05-19 07:43:22 +02:00
|
|
|
static GIOChannel *event_channel;
|
2009-01-10 18:55:36 +01:00
|
|
|
static guint event_pipe_source_id;
|
2009-01-01 18:22:11 +01:00
|
|
|
static GMutex *event_pipe_mutex;
|
|
|
|
static bool pipe_events[PIPE_EVENT_MAX];
|
|
|
|
static event_pipe_callback_t event_pipe_callbacks[PIPE_EVENT_MAX];
|
2008-04-12 11:46:11 +02:00
|
|
|
|
2009-01-01 18:22:11 +01:00
|
|
|
/**
|
|
|
|
* Invoke the callback for a certain event.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
event_pipe_invoke(enum pipe_event event)
|
|
|
|
{
|
|
|
|
assert((unsigned)event < PIPE_EVENT_MAX);
|
|
|
|
assert(event_pipe_callbacks[event] != NULL);
|
|
|
|
|
|
|
|
event_pipe_callbacks[event]();
|
|
|
|
}
|
|
|
|
|
2009-01-04 20:32:45 +01:00
|
|
|
static gboolean
|
|
|
|
main_notify_event(G_GNUC_UNUSED GIOChannel *source,
|
|
|
|
G_GNUC_UNUSED GIOCondition condition,
|
|
|
|
G_GNUC_UNUSED gpointer data)
|
2008-04-12 11:46:11 +02:00
|
|
|
{
|
2008-12-30 19:20:20 +01:00
|
|
|
char buffer[256];
|
2010-05-19 07:43:22 +02:00
|
|
|
gsize bytes_read;
|
|
|
|
GError *error = NULL;
|
|
|
|
GIOStatus status = g_io_channel_read_chars(event_channel,
|
|
|
|
buffer, sizeof(buffer),
|
|
|
|
&bytes_read, &error);
|
|
|
|
if (status == G_IO_STATUS_ERROR)
|
2010-09-25 15:00:43 +02:00
|
|
|
MPD_ERROR("error reading from pipe: %s", error->message);
|
2009-01-01 18:22:11 +01:00
|
|
|
|
2010-05-19 07:43:22 +02:00
|
|
|
bool events[PIPE_EVENT_MAX];
|
2009-01-01 18:22:11 +01:00
|
|
|
g_mutex_lock(event_pipe_mutex);
|
|
|
|
memcpy(events, pipe_events, sizeof(events));
|
|
|
|
memset(pipe_events, 0, sizeof(pipe_events));
|
|
|
|
g_mutex_unlock(event_pipe_mutex);
|
|
|
|
|
|
|
|
for (unsigned i = 0; i < PIPE_EVENT_MAX; ++i)
|
2009-01-02 11:20:41 +01:00
|
|
|
if (events[i])
|
|
|
|
/* invoke the event handler */
|
2009-01-01 18:22:11 +01:00
|
|
|
event_pipe_invoke(i);
|
2008-04-12 11:46:11 +02:00
|
|
|
|
2008-12-30 19:24:39 +01:00
|
|
|
return true;
|
2008-04-12 11:46:11 +02:00
|
|
|
}
|
|
|
|
|
2009-01-01 18:12:14 +01:00
|
|
|
void event_pipe_init(void)
|
2008-04-12 11:46:11 +02:00
|
|
|
{
|
2008-12-30 19:24:39 +01:00
|
|
|
GIOChannel *channel;
|
2009-01-03 13:22:55 +01:00
|
|
|
int ret;
|
2008-12-30 19:24:39 +01:00
|
|
|
|
2009-11-08 22:11:35 +01:00
|
|
|
ret = pipe_cloexec_nonblock(event_pipe);
|
2009-01-03 13:22:55 +01:00
|
|
|
if (ret < 0)
|
2010-09-25 15:00:43 +02:00
|
|
|
MPD_ERROR("Couldn't open pipe: %s", strerror(errno));
|
2008-12-30 19:20:36 +01:00
|
|
|
|
2010-05-19 07:32:10 +02:00
|
|
|
#ifndef G_OS_WIN32
|
2009-01-01 18:12:14 +01:00
|
|
|
channel = g_io_channel_unix_new(event_pipe[0]);
|
2010-05-19 07:32:10 +02:00
|
|
|
#else
|
|
|
|
channel = g_io_channel_win32_new_fd(event_pipe[0]);
|
|
|
|
#endif
|
2010-05-19 07:43:22 +02:00
|
|
|
g_io_channel_set_encoding(channel, NULL, NULL);
|
|
|
|
g_io_channel_set_buffered(channel, false);
|
2010-05-19 07:32:10 +02:00
|
|
|
|
2009-01-10 18:55:36 +01:00
|
|
|
event_pipe_source_id = g_io_add_watch(channel, G_IO_IN,
|
|
|
|
main_notify_event, NULL);
|
2010-05-19 07:43:22 +02:00
|
|
|
|
|
|
|
event_channel = channel;
|
2008-12-30 19:24:39 +01:00
|
|
|
|
2009-01-01 18:22:11 +01:00
|
|
|
event_pipe_mutex = g_mutex_new();
|
2008-04-12 11:46:11 +02:00
|
|
|
}
|
|
|
|
|
2009-01-01 18:12:14 +01:00
|
|
|
void event_pipe_deinit(void)
|
2008-09-24 07:14:11 +02:00
|
|
|
{
|
2009-01-01 18:22:11 +01:00
|
|
|
g_mutex_free(event_pipe_mutex);
|
|
|
|
|
2009-01-10 18:55:36 +01:00
|
|
|
g_source_remove(event_pipe_source_id);
|
2010-05-19 07:43:22 +02:00
|
|
|
g_io_channel_unref(event_channel);
|
2009-01-10 18:55:36 +01:00
|
|
|
|
2010-09-21 03:28:08 +02:00
|
|
|
#ifndef WIN32
|
|
|
|
/* By some strange reason this call hangs on Win32 */
|
2009-01-03 14:53:36 +01:00
|
|
|
close(event_pipe[0]);
|
2010-09-21 03:28:08 +02:00
|
|
|
#endif
|
2009-01-03 14:53:36 +01:00
|
|
|
close(event_pipe[1]);
|
2008-04-12 11:46:11 +02:00
|
|
|
}
|
|
|
|
|
2009-01-01 18:22:11 +01:00
|
|
|
void
|
|
|
|
event_pipe_register(enum pipe_event event, event_pipe_callback_t callback)
|
2008-04-12 11:46:11 +02:00
|
|
|
{
|
2009-01-01 18:22:11 +01:00
|
|
|
assert((unsigned)event < PIPE_EVENT_MAX);
|
|
|
|
assert(event_pipe_callbacks[event] == NULL);
|
|
|
|
|
|
|
|
event_pipe_callbacks[event] = callback;
|
|
|
|
}
|
|
|
|
|
|
|
|
void event_pipe_emit(enum pipe_event event)
|
|
|
|
{
|
|
|
|
ssize_t w;
|
|
|
|
|
|
|
|
assert((unsigned)event < PIPE_EVENT_MAX);
|
|
|
|
|
|
|
|
g_mutex_lock(event_pipe_mutex);
|
|
|
|
if (pipe_events[event]) {
|
|
|
|
/* already set: don't write */
|
|
|
|
g_mutex_unlock(event_pipe_mutex);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
pipe_events[event] = true;
|
|
|
|
g_mutex_unlock(event_pipe_mutex);
|
|
|
|
|
|
|
|
w = write(event_pipe[1], "", 1);
|
2008-12-30 19:20:20 +01:00
|
|
|
if (w < 0 && errno != EAGAIN && errno != EINTR)
|
2010-09-25 15:00:43 +02:00
|
|
|
MPD_ERROR("error writing to pipe: %s", strerror(errno));
|
2008-04-12 11:46:11 +02:00
|
|
|
}
|
|
|
|
|
2009-01-01 18:47:25 +01:00
|
|
|
void event_pipe_emit_fast(enum pipe_event event)
|
|
|
|
{
|
|
|
|
assert((unsigned)event < PIPE_EVENT_MAX);
|
|
|
|
|
|
|
|
pipe_events[event] = true;
|
2009-04-01 17:14:25 +02:00
|
|
|
(void)write(event_pipe[1], "", 1);
|
2009-01-01 18:47:25 +01:00
|
|
|
}
|