105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_WATCH_QUEUE_H
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#define _UAPI_LINUX_WATCH_QUEUE_H
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/ioctl.h>
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#define O_NOTIFICATION_PIPE O_EXCL /* Parameter to pipe2() selecting notification pipe */
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#define IOC_WATCH_QUEUE_SET_SIZE _IO('W', 0x60) /* Set the size in pages */
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#define IOC_WATCH_QUEUE_SET_FILTER _IO('W', 0x61) /* Set the filter */
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enum watch_notification_type {
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WATCH_TYPE_META = 0, /* Special record */
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WATCH_TYPE_KEY_NOTIFY = 1, /* Key change event notification */
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WATCH_TYPE__NR = 2
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};
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enum watch_meta_notification_subtype {
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WATCH_META_REMOVAL_NOTIFICATION = 0, /* Watched object was removed */
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WATCH_META_LOSS_NOTIFICATION = 1, /* Data loss occurred */
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};
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/*
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* Notification record header. This is aligned to 64-bits so that subclasses
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* can contain __u64 fields.
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*/
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struct watch_notification {
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__u32 type:24; /* enum watch_notification_type */
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__u32 subtype:8; /* Type-specific subtype (filterable) */
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__u32 info;
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#define WATCH_INFO_LENGTH 0x0000007f /* Length of record */
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#define WATCH_INFO_LENGTH__SHIFT 0
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#define WATCH_INFO_ID 0x0000ff00 /* ID of watchpoint */
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#define WATCH_INFO_ID__SHIFT 8
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#define WATCH_INFO_TYPE_INFO 0xffff0000 /* Type-specific info */
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#define WATCH_INFO_TYPE_INFO__SHIFT 16
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#define WATCH_INFO_FLAG_0 0x00010000 /* Type-specific info, flag bit 0 */
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#define WATCH_INFO_FLAG_1 0x00020000 /* ... */
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#define WATCH_INFO_FLAG_2 0x00040000
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#define WATCH_INFO_FLAG_3 0x00080000
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#define WATCH_INFO_FLAG_4 0x00100000
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#define WATCH_INFO_FLAG_5 0x00200000
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#define WATCH_INFO_FLAG_6 0x00400000
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#define WATCH_INFO_FLAG_7 0x00800000
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};
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/*
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* Notification filtering rules (IOC_WATCH_QUEUE_SET_FILTER).
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*/
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struct watch_notification_type_filter {
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__u32 type; /* Type to apply filter to */
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__u32 info_filter; /* Filter on watch_notification::info */
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__u32 info_mask; /* Mask of relevant bits in info_filter */
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__u32 subtype_filter[8]; /* Bitmask of subtypes to filter on */
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};
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struct watch_notification_filter {
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__u32 nr_filters; /* Number of filters */
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__u32 __reserved; /* Must be 0 */
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struct watch_notification_type_filter filters[];
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};
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/*
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* Extended watch removal notification. This is used optionally if the type
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* wants to indicate an identifier for the object being watched, if there is
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* such. This can be distinguished by the length.
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*
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* type -> WATCH_TYPE_META
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* subtype -> WATCH_META_REMOVAL_NOTIFICATION
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*/
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struct watch_notification_removal {
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struct watch_notification watch;
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__u64 id; /* Type-dependent identifier */
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};
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/*
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* Type of key/keyring change notification.
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*/
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enum key_notification_subtype {
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NOTIFY_KEY_INSTANTIATED = 0, /* Key was instantiated (aux is error code) */
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NOTIFY_KEY_UPDATED = 1, /* Key was updated */
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NOTIFY_KEY_LINKED = 2, /* Key (aux) was added to watched keyring */
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NOTIFY_KEY_UNLINKED = 3, /* Key (aux) was removed from watched keyring */
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NOTIFY_KEY_CLEARED = 4, /* Keyring was cleared */
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NOTIFY_KEY_REVOKED = 5, /* Key was revoked */
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NOTIFY_KEY_INVALIDATED = 6, /* Key was invalidated */
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NOTIFY_KEY_SETATTR = 7, /* Key's attributes got changed */
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};
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/*
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* Key/keyring notification record.
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* - watch.type = WATCH_TYPE_KEY_NOTIFY
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* - watch.subtype = enum key_notification_type
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*/
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struct key_notification {
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struct watch_notification watch;
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__u32 key_id; /* The key/keyring affected */
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__u32 aux; /* Per-type auxiliary data */
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};
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#endif /* _UAPI_LINUX_WATCH_QUEUE_H */
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