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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "InotifySource.hxx"
extern "C" {
#include "fifo_buffer.h"
}
#include "fd_util.h"
#include "mpd_error.h"
#include <glib.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <errno.h>
#include <stdbool.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "inotify"
struct mpd_inotify_source {
int fd;
GIOChannel *channel;
/**
* The channel's source id in the GLib main loop.
*/
guint id;
struct fifo_buffer *buffer;
mpd_inotify_callback_t callback;
void *callback_ctx;
};
/**
* A GQuark for GError instances.
*/
static inline GQuark
mpd_inotify_quark(void)
{
return g_quark_from_static_string("inotify");
}
static gboolean
mpd_inotify_in_event(G_GNUC_UNUSED GIOChannel *_source,
G_GNUC_UNUSED GIOCondition condition,
gpointer data)
{
struct mpd_inotify_source *source = (struct mpd_inotify_source *)data;
void *dest;
size_t length;
ssize_t nbytes;
dest = fifo_buffer_write(source->buffer, &length);
if (dest == NULL)
MPD_ERROR("buffer full");
nbytes = read(source->fd, dest, length);
if (nbytes < 0)
MPD_ERROR("failed to read from inotify: %s",
g_strerror(errno));
if (nbytes == 0)
MPD_ERROR("end of file from inotify");
fifo_buffer_append(source->buffer, nbytes);
while (true) {
const char *name;
const struct inotify_event *event =
(const struct inotify_event *)
fifo_buffer_read(source->buffer, &length);
if (event == NULL || length < sizeof(*event) ||
length < sizeof(*event) + event->len)
break;
if (event->len > 0 && event->name[event->len - 1] == 0)
name = event->name;
else
name = NULL;
source->callback(event->wd, event->mask, name,
source->callback_ctx);
fifo_buffer_consume(source->buffer,
sizeof(*event) + event->len);
}
return true;
}
struct mpd_inotify_source *
mpd_inotify_source_new(mpd_inotify_callback_t callback, void *callback_ctx,
GError **error_r)
{
struct mpd_inotify_source *source =
g_new(struct mpd_inotify_source, 1);
source->fd = inotify_init_cloexec();
if (source->fd < 0) {
g_set_error(error_r, mpd_inotify_quark(), errno,
"inotify_init() has failed: %s",
g_strerror(errno));
g_free(source);
return NULL;
}
source->buffer = fifo_buffer_new(4096);
source->channel = g_io_channel_unix_new(source->fd);
source->id = g_io_add_watch(source->channel, G_IO_IN,
mpd_inotify_in_event, source);
source->callback = callback;
source->callback_ctx = callback_ctx;
return source;
}
void
mpd_inotify_source_free(struct mpd_inotify_source *source)
{
g_source_remove(source->id);
g_io_channel_unref(source->channel);
fifo_buffer_free(source->buffer);
close(source->fd);
g_free(source);
}
int
mpd_inotify_source_add(struct mpd_inotify_source *source,
const char *path_fs, unsigned mask,
GError **error_r)
{
int wd = inotify_add_watch(source->fd, path_fs, mask);
if (wd < 0)
g_set_error(error_r, mpd_inotify_quark(), errno,
"inotify_add_watch() has failed: %s",
g_strerror(errno));
return wd;
}
void
mpd_inotify_source_rm(struct mpd_inotify_source *source, unsigned wd)
{
int ret = inotify_rm_watch(source->fd, wd);
if (ret < 0 && errno != EINVAL)
g_warning("inotify_rm_watch() has failed: %s",
g_strerror(errno));
/* EINVAL may happen here when the file has been deleted; the
kernel seems to auto-unregister deleted files */
}
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