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watch_queue.h
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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> #include <linux/fcntl.h> #include <linux/ioctl.h> #define O_NOTIFICATION_PIPE O_EXCL /* Parameter to pipe2() selecting notification pipe */ #define IOC_WATCH_QUEUE_SET_SIZE _IO('W', 0x60) /* Set the size in pages */ #define IOC_WATCH_QUEUE_SET_FILTER _IO('W', 0x61) /* Set the filter */ enum watch_notification_type { WATCH_TYPE_META = 0, /* Special record */ WATCH_TYPE_KEY_NOTIFY = 1, /* Key change event notification */ WATCH_TYPE__NR = 2 }; 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 }; /* * Notification filtering rules (IOC_WATCH_QUEUE_SET_FILTER). */ struct watch_notification_type_filter { __u32 type; /* Type to apply filter to */ __u32 info_filter; /* Filter on watch_notification::info */ __u32 info_mask; /* Mask of relevant bits in info_filter */ __u32 subtype_filter[8]; /* Bitmask of subtypes to filter on */ }; struct watch_notification_filter { __u32 nr_filters; /* Number of filters */ __u32 __reserved; /* Must be 0 */ struct watch_notification_type_filter filters[]; }; /* * 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 */ }; /* * Type of key/keyring change notification. */ enum key_notification_subtype { NOTIFY_KEY_INSTANTIATED = 0, /* Key was instantiated (aux is error code) */ NOTIFY_KEY_UPDATED = 1, /* Key was updated */ NOTIFY_KEY_LINKED = 2, /* Key (aux) was added to watched keyring */ NOTIFY_KEY_UNLINKED = 3, /* Key (aux) was removed from watched keyring */ NOTIFY_KEY_CLEARED = 4, /* Keyring was cleared */ NOTIFY_KEY_REVOKED = 5, /* Key was revoked */ NOTIFY_KEY_INVALIDATED = 6, /* Key was invalidated */ NOTIFY_KEY_SETATTR = 7, /* Key's attributes got changed */ }; /* * Key/keyring notification record. * - watch.type = WATCH_TYPE_KEY_NOTIFY * - watch.subtype = enum key_notification_type */ struct key_notification { struct watch_notification watch; __u32 key_id; /* The key/keyring affected */ __u32 aux; /* Per-type auxiliary data */ }; #endif /* _LINUX_WATCH_QUEUE_H */