5b82ffc291
After we've been hit by Large File Support problems several times in the past week (which only occur on 32 bit platforms, which I don't have), this is yet another attempt to fix the issue.
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "event_pipe.h"
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#include "fd_util.h"
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#include <stdbool.h>
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#include <assert.h>
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#include <glib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <unistd.h>
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#ifdef WIN32
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/* for _O_BINARY */
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#include <fcntl.h>
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#endif
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "event_pipe"
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static int event_pipe[2];
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static guint event_pipe_source_id;
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static GMutex *event_pipe_mutex;
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static bool pipe_events[PIPE_EVENT_MAX];
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static event_pipe_callback_t event_pipe_callbacks[PIPE_EVENT_MAX];
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/**
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* Invoke the callback for a certain event.
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*/
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static void
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event_pipe_invoke(enum pipe_event event)
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{
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assert((unsigned)event < PIPE_EVENT_MAX);
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assert(event_pipe_callbacks[event] != NULL);
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event_pipe_callbacks[event]();
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}
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static gboolean
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main_notify_event(G_GNUC_UNUSED GIOChannel *source,
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G_GNUC_UNUSED GIOCondition condition,
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G_GNUC_UNUSED gpointer data)
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{
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char buffer[256];
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ssize_t r = read(event_pipe[0], buffer, sizeof(buffer));
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bool events[PIPE_EVENT_MAX];
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if (r < 0 && errno != EAGAIN && errno != EINTR)
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g_error("error reading from pipe: %s", strerror(errno));
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g_mutex_lock(event_pipe_mutex);
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memcpy(events, pipe_events, sizeof(events));
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memset(pipe_events, 0, sizeof(pipe_events));
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g_mutex_unlock(event_pipe_mutex);
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for (unsigned i = 0; i < PIPE_EVENT_MAX; ++i)
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if (events[i])
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/* invoke the event handler */
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event_pipe_invoke(i);
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return true;
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}
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void event_pipe_init(void)
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{
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GIOChannel *channel;
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int ret;
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ret = pipe_cloexec_nonblock(event_pipe);
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if (ret < 0)
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g_error("Couldn't open pipe: %s", strerror(errno));
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channel = g_io_channel_unix_new(event_pipe[0]);
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event_pipe_source_id = g_io_add_watch(channel, G_IO_IN,
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main_notify_event, NULL);
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g_io_channel_unref(channel);
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event_pipe_mutex = g_mutex_new();
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}
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void event_pipe_deinit(void)
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{
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g_mutex_free(event_pipe_mutex);
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g_source_remove(event_pipe_source_id);
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close(event_pipe[0]);
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close(event_pipe[1]);
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}
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void
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event_pipe_register(enum pipe_event event, event_pipe_callback_t callback)
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{
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assert((unsigned)event < PIPE_EVENT_MAX);
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assert(event_pipe_callbacks[event] == NULL);
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event_pipe_callbacks[event] = callback;
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}
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void event_pipe_emit(enum pipe_event event)
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{
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ssize_t w;
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assert((unsigned)event < PIPE_EVENT_MAX);
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g_mutex_lock(event_pipe_mutex);
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if (pipe_events[event]) {
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/* already set: don't write */
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g_mutex_unlock(event_pipe_mutex);
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return;
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}
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pipe_events[event] = true;
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g_mutex_unlock(event_pipe_mutex);
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w = write(event_pipe[1], "", 1);
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if (w < 0 && errno != EAGAIN && errno != EINTR)
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g_error("error writing to pipe: %s", strerror(errno));
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}
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void event_pipe_emit_fast(enum pipe_event event)
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{
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assert((unsigned)event < PIPE_EVENT_MAX);
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pipe_events[event] = true;
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(void)write(event_pipe[1], "", 1);
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}
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