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a1014f1023
Send events to userspace by reading the file descriptor from fanotify_init().
One will get blocks of data which look like:
struct fanotify_event_metadata {
__u32 event_len;
__u32 vers;
__s32 fd;
__u64 mask;
__s64 pid;
__u64 cookie;
} __attribute__ ((packed));
Simple code to retrieve and deal with events is below
while ((len = read(fan_fd, buf, sizeof(buf))) > 0) {
struct fanotify_event_metadata *metadata;
metadata = (void *)buf;
while(FAN_EVENT_OK(metadata, len)) {
[PROCESS HERE!!]
if (metadata->fd >= 0 && close(metadata->fd) != 0)
goto fail;
metadata = FAN_EVENT_NEXT(metadata, len);
}
}
Signed-off-by: Eric Paris <eparis@redhat.com>
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
#ifndef _LINUX_FANOTIFY_H
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#define _LINUX_FANOTIFY_H
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#include <linux/types.h>
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/* the following events that user-space can register for */
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#define FAN_ACCESS 0x00000001 /* File was accessed */
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#define FAN_MODIFY 0x00000002 /* File was modified */
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#define FAN_CLOSE_WRITE 0x00000008 /* Unwrittable file closed */
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#define FAN_CLOSE_NOWRITE 0x00000010 /* Writtable file closed */
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#define FAN_OPEN 0x00000020 /* File was opened */
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#define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */
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/* FIXME currently Q's have no limit.... */
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#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
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/* helper events */
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#define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
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/* flags used for fanotify_init() */
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#define FAN_CLOEXEC 0x00000001
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#define FAN_NONBLOCK 0x00000002
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#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK)
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/* flags used for fanotify_modify_mark() */
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#define FAN_MARK_ADD 0x00000001
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#define FAN_MARK_REMOVE 0x00000002
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#define FAN_MARK_DONT_FOLLOW 0x00000004
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#define FAN_MARK_ONLYDIR 0x00000008
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#define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
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FAN_MARK_REMOVE |\
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FAN_MARK_DONT_FOLLOW |\
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FAN_MARK_ONLYDIR)
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/*
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* All of the events - we build the list by hand so that we can add flags in
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* the future and not break backward compatibility. Apps will get only the
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* events that they originally wanted. Be sure to add new events here!
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*/
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#define FAN_ALL_EVENTS (FAN_ACCESS |\
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FAN_MODIFY |\
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FAN_CLOSE |\
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FAN_OPEN)
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/*
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* All legal FAN bits userspace can request (although possibly not all
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* at the same time.
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*/
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#define FAN_ALL_INCOMING_EVENTS (FAN_ALL_EVENTS |\
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FAN_EVENT_ON_CHILD)
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#define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
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FAN_Q_OVERFLOW)
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#define FANOTIFY_METADATA_VERSION 1
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struct fanotify_event_metadata {
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__u32 event_len;
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__u32 vers;
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__s32 fd;
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__u64 mask;
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} __attribute__ ((packed));
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/* Helper functions to deal with fanotify_event_metadata buffers */
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#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
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#define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
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(struct fanotify_event_metadata*)(((char *)(meta)) + \
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(meta)->event_len))
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#define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
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(long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
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(long)(meta)->event_len <= (long)(len))
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#ifdef __KERNEL__
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#endif /* __KERNEL__ */
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#endif /* _LINUX_FANOTIFY_H */
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