128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/*
|
|
* QEMU file monitor helper
|
|
*
|
|
* Copyright (c) 2018 Red Hat, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#ifndef QEMU_FILEMONITOR_H
|
|
#define QEMU_FILEMONITOR_H
|
|
|
|
|
|
|
|
typedef struct QFileMonitor QFileMonitor;
|
|
|
|
typedef enum {
|
|
/* File has been created in a dir */
|
|
QFILE_MONITOR_EVENT_CREATED,
|
|
/* File has been modified in a dir */
|
|
QFILE_MONITOR_EVENT_MODIFIED,
|
|
/* File has been deleted in a dir */
|
|
QFILE_MONITOR_EVENT_DELETED,
|
|
/* File has attributes changed */
|
|
QFILE_MONITOR_EVENT_ATTRIBUTES,
|
|
/* Dir is no longer being monitored (due to deletion) */
|
|
QFILE_MONITOR_EVENT_IGNORED,
|
|
} QFileMonitorEvent;
|
|
|
|
|
|
/**
|
|
* QFileMonitorHandler:
|
|
* @id: id from qemu_file_monitor_add_watch()
|
|
* @event: the file change that occurred
|
|
* @filename: the name of the file affected
|
|
* @opaque: opaque data provided to qemu_file_monitor_add_watch()
|
|
*
|
|
* Invoked whenever a file changes. If @event is
|
|
* QFILE_MONITOR_EVENT_IGNORED, @filename will be
|
|
* empty.
|
|
*
|
|
*/
|
|
typedef void (*QFileMonitorHandler)(int64_t id,
|
|
QFileMonitorEvent event,
|
|
const char *filename,
|
|
void *opaque);
|
|
|
|
/**
|
|
* qemu_file_monitor_new:
|
|
* @errp: pointer to a NULL-initialized error object
|
|
*
|
|
* Create a handle for a file monitoring object.
|
|
*
|
|
* This object does locking internally to enable it to be
|
|
* safe to use from multiple threads
|
|
*
|
|
* If the platform does not support file monitoring, an
|
|
* error will be reported. Likewise if file monitoring
|
|
* is supported, but cannot be initialized
|
|
*
|
|
* Currently this is implemented on Linux platforms with
|
|
* the inotify subsystem.
|
|
*
|
|
* Returns: the new monitoring object, or NULL on error
|
|
*/
|
|
QFileMonitor *qemu_file_monitor_new(Error **errp);
|
|
|
|
/**
|
|
* qemu_file_monitor_free:
|
|
* @mon: the file monitor context
|
|
*
|
|
* Free resources associated with the file monitor,
|
|
* including any currently registered watches.
|
|
*/
|
|
void qemu_file_monitor_free(QFileMonitor *mon);
|
|
|
|
/**
|
|
* qemu_file_monitor_add_watch:
|
|
* @mon: the file monitor context
|
|
* @dirpath: the directory whose contents to watch
|
|
* @filename: optional filename to filter on
|
|
* @cb: the function to invoke when @dirpath has changes
|
|
* @opaque: data to pass to @cb
|
|
* @errp: pointer to a NULL-initialized error object
|
|
*
|
|
* Register to receive notifications of changes
|
|
* in the directory @dirpath. All files in the
|
|
* directory will be monitored. If the caller is
|
|
* only interested in one specific file, @filename
|
|
* can be used to filter events.
|
|
*
|
|
* Returns: a positive integer watch ID, or -1 on error
|
|
*/
|
|
int64_t qemu_file_monitor_add_watch(QFileMonitor *mon,
|
|
const char *dirpath,
|
|
const char *filename,
|
|
QFileMonitorHandler cb,
|
|
void *opaque,
|
|
Error **errp);
|
|
|
|
/**
|
|
* qemu_file_monitor_remove_watch:
|
|
* @mon: the file monitor context
|
|
* @dirpath: the directory whose contents to unwatch
|
|
* @id: id of the watch to remove
|
|
*
|
|
* Removes the file monitoring watch @id, associated
|
|
* with the directory @dirpath. This must never be
|
|
* called from a QFileMonitorHandler callback, or a
|
|
* deadlock will result.
|
|
*/
|
|
void qemu_file_monitor_remove_watch(QFileMonitor *mon,
|
|
const char *dirpath,
|
|
int64_t id);
|
|
|
|
#endif /* QEMU_FILEMONITOR_H */
|