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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_WATCH_QUEUE_H
#define _LINUX_WATCH_QUEUE_H
#include <linux/types.h>
enum watch_notification_type {
WATCH_TYPE_META = 0, /* Special record */
WATCH_TYPE__NR = 1
};
enum watch_meta_notification_subtype {
WATCH_META_REMOVAL_NOTIFICATION = 0, /* Watched object was removed */
WATCH_META_LOSS_NOTIFICATION = 1, /* Data loss occurred */
};
/*
* Notification record header. This is aligned to 64-bits so that subclasses
* can contain __u64 fields.
*/
struct watch_notification {
__u32 type:24; /* enum watch_notification_type */
__u32 subtype:8; /* Type-specific subtype (filterable) */
__u32 info;
#define WATCH_INFO_LENGTH 0x0000007f /* Length of record */
#define WATCH_INFO_LENGTH__SHIFT 0
#define WATCH_INFO_ID 0x0000ff00 /* ID of watchpoint */
#define WATCH_INFO_ID__SHIFT 8
#define WATCH_INFO_TYPE_INFO 0xffff0000 /* Type-specific info */
#define WATCH_INFO_TYPE_INFO__SHIFT 16
#define WATCH_INFO_FLAG_0 0x00010000 /* Type-specific info, flag bit 0 */
#define WATCH_INFO_FLAG_1 0x00020000 /* ... */
#define WATCH_INFO_FLAG_2 0x00040000
#define WATCH_INFO_FLAG_3 0x00080000
#define WATCH_INFO_FLAG_4 0x00100000
#define WATCH_INFO_FLAG_5 0x00200000
#define WATCH_INFO_FLAG_6 0x00400000
#define WATCH_INFO_FLAG_7 0x00800000
};
/*
* Extended watch removal notification. This is used optionally if the type
* wants to indicate an identifier for the object being watched, if there is
* such. This can be distinguished by the length.
*
* type -> WATCH_TYPE_META
* subtype -> WATCH_META_REMOVAL_NOTIFICATION
*/
struct watch_notification_removal {
struct watch_notification watch;
__u64 id; /* Type-dependent identifier */
};
#endif /* _LINUX_WATCH_QUEUE_H */
Private