1*0858caa4SDavid Howells /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*0858caa4SDavid Howells #ifndef _UAPI_LINUX_WATCH_QUEUE_H 3*0858caa4SDavid Howells #define _UAPI_LINUX_WATCH_QUEUE_H 4*0858caa4SDavid Howells 5*0858caa4SDavid Howells #include <linux/types.h> 6*0858caa4SDavid Howells 7*0858caa4SDavid Howells enum watch_notification_type { 8*0858caa4SDavid Howells WATCH_TYPE_META = 0, /* Special record */ 9*0858caa4SDavid Howells WATCH_TYPE__NR = 1 10*0858caa4SDavid Howells }; 11*0858caa4SDavid Howells 12*0858caa4SDavid Howells enum watch_meta_notification_subtype { 13*0858caa4SDavid Howells WATCH_META_REMOVAL_NOTIFICATION = 0, /* Watched object was removed */ 14*0858caa4SDavid Howells WATCH_META_LOSS_NOTIFICATION = 1, /* Data loss occurred */ 15*0858caa4SDavid Howells }; 16*0858caa4SDavid Howells 17*0858caa4SDavid Howells /* 18*0858caa4SDavid Howells * Notification record header. This is aligned to 64-bits so that subclasses 19*0858caa4SDavid Howells * can contain __u64 fields. 20*0858caa4SDavid Howells */ 21*0858caa4SDavid Howells struct watch_notification { 22*0858caa4SDavid Howells __u32 type:24; /* enum watch_notification_type */ 23*0858caa4SDavid Howells __u32 subtype:8; /* Type-specific subtype (filterable) */ 24*0858caa4SDavid Howells __u32 info; 25*0858caa4SDavid Howells #define WATCH_INFO_LENGTH 0x0000007f /* Length of record */ 26*0858caa4SDavid Howells #define WATCH_INFO_LENGTH__SHIFT 0 27*0858caa4SDavid Howells #define WATCH_INFO_ID 0x0000ff00 /* ID of watchpoint */ 28*0858caa4SDavid Howells #define WATCH_INFO_ID__SHIFT 8 29*0858caa4SDavid Howells #define WATCH_INFO_TYPE_INFO 0xffff0000 /* Type-specific info */ 30*0858caa4SDavid Howells #define WATCH_INFO_TYPE_INFO__SHIFT 16 31*0858caa4SDavid Howells #define WATCH_INFO_FLAG_0 0x00010000 /* Type-specific info, flag bit 0 */ 32*0858caa4SDavid Howells #define WATCH_INFO_FLAG_1 0x00020000 /* ... */ 33*0858caa4SDavid Howells #define WATCH_INFO_FLAG_2 0x00040000 34*0858caa4SDavid Howells #define WATCH_INFO_FLAG_3 0x00080000 35*0858caa4SDavid Howells #define WATCH_INFO_FLAG_4 0x00100000 36*0858caa4SDavid Howells #define WATCH_INFO_FLAG_5 0x00200000 37*0858caa4SDavid Howells #define WATCH_INFO_FLAG_6 0x00400000 38*0858caa4SDavid Howells #define WATCH_INFO_FLAG_7 0x00800000 39*0858caa4SDavid Howells }; 40*0858caa4SDavid Howells 41*0858caa4SDavid Howells 42*0858caa4SDavid Howells /* 43*0858caa4SDavid Howells * Extended watch removal notification. This is used optionally if the type 44*0858caa4SDavid Howells * wants to indicate an identifier for the object being watched, if there is 45*0858caa4SDavid Howells * such. This can be distinguished by the length. 46*0858caa4SDavid Howells * 47*0858caa4SDavid Howells * type -> WATCH_TYPE_META 48*0858caa4SDavid Howells * subtype -> WATCH_META_REMOVAL_NOTIFICATION 49*0858caa4SDavid Howells */ 50*0858caa4SDavid Howells struct watch_notification_removal { 51*0858caa4SDavid Howells struct watch_notification watch; 52*0858caa4SDavid Howells __u64 id; /* Type-dependent identifier */ 53*0858caa4SDavid Howells }; 54*0858caa4SDavid Howells 55*0858caa4SDavid Howells #endif /* _UAPI_LINUX_WATCH_QUEUE_H */ 56