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authorEric Paris <eparis@redhat.com>2009-12-17 21:24:26 -0500
committerEric Paris <eparis@redhat.com>2010-07-28 09:58:56 -0400
commita1014f102322398e67524b68b3300acf384e6c1f (patch)
tree2d9d82e6a3d84bae796e4aedfd8be3409be6a4c3 /include/linux/fanotify.h
parent2a3edf86040a7e15684525a2aadc29f532c51325 (diff)
fanotify: send events using read
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>
Diffstat (limited to 'include/linux/fanotify.h')
-rw-r--r--include/linux/fanotify.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 95aeea2a3ca..c1c66162a46 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -51,6 +51,30 @@
*/
#define FAN_ALL_INCOMING_EVENTS (FAN_ALL_EVENTS |\
FAN_EVENT_ON_CHILD)
+
+#define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
+ FAN_Q_OVERFLOW)
+
+#define FANOTIFY_METADATA_VERSION 1
+
+struct fanotify_event_metadata {
+ __u32 event_len;
+ __u32 vers;
+ __s32 fd;
+ __u64 mask;
+} __attribute__ ((packed));
+
+/* Helper functions to deal with fanotify_event_metadata buffers */
+#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
+
+#define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
+ (struct fanotify_event_metadata*)(((char *)(meta)) + \
+ (meta)->event_len))
+
+#define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
+ (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
+ (long)(meta)->event_len <= (long)(len))
+
#ifdef __KERNEL__
#endif /* __KERNEL__ */