Quelle watch_queue.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_LINUX_WATCH_QUEUE_H
#define _UAPI_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 /* _UAPI_LINUX_WATCH_QUEUE_H */

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