1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _UAPI_LINUX_WATCH_QUEUE_H 3 #define _UAPI_LINUX_WATCH_QUEUE_H 4 5 #include <linux/types.h> 6 7 enum watch_notification_type { 8 WATCH_TYPE_META = 0, /* Special record */ 9 WATCH_TYPE__NR = 1 10 }; 11 12 enum watch_meta_notification_subtype { 13 WATCH_META_REMOVAL_NOTIFICATION = 0, /* Watched object was removed */ 14 WATCH_META_LOSS_NOTIFICATION = 1, /* Data loss occurred */ 15 }; 16 17 /* 18 * Notification record header. This is aligned to 64-bits so that subclasses 19 * can contain __u64 fields. 20 */ 21 struct watch_notification { 22 __u32 type:24; /* enum watch_notification_type */ 23 __u32 subtype:8; /* Type-specific subtype (filterable) */ 24 __u32 info; 25 #define WATCH_INFO_LENGTH 0x0000007f /* Length of record */ 26 #define WATCH_INFO_LENGTH__SHIFT 0 27 #define WATCH_INFO_ID 0x0000ff00 /* ID of watchpoint */ 28 #define WATCH_INFO_ID__SHIFT 8 29 #define WATCH_INFO_TYPE_INFO 0xffff0000 /* Type-specific info */ 30 #define WATCH_INFO_TYPE_INFO__SHIFT 16 31 #define WATCH_INFO_FLAG_0 0x00010000 /* Type-specific info, flag bit 0 */ 32 #define WATCH_INFO_FLAG_1 0x00020000 /* ... */ 33 #define WATCH_INFO_FLAG_2 0x00040000 34 #define WATCH_INFO_FLAG_3 0x00080000 35 #define WATCH_INFO_FLAG_4 0x00100000 36 #define WATCH_INFO_FLAG_5 0x00200000 37 #define WATCH_INFO_FLAG_6 0x00400000 38 #define WATCH_INFO_FLAG_7 0x00800000 39 }; 40 41 42 /* 43 * Extended watch removal notification. This is used optionally if the type 44 * wants to indicate an identifier for the object being watched, if there is 45 * such. This can be distinguished by the length. 46 * 47 * type -> WATCH_TYPE_META 48 * subtype -> WATCH_META_REMOVAL_NOTIFICATION 49 */ 50 struct watch_notification_removal { 51 struct watch_notification watch; 52 __u64 id; /* Type-dependent identifier */ 53 }; 54 55 #endif /* _UAPI_LINUX_WATCH_QUEUE_H */ 56