fanotify: support reporting thread id instead of process id

In order to identify which thread triggered the event in a
multi-threaded program, add the FAN_REPORT_TID flag in fanotify_init to
opt-in for reporting the event creator's thread id information.

Signed-off-by: nixiaoming <nixiaoming@huawei.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h
index d0c05de670ef..b86740d1c50a 100644
--- a/include/uapi/linux/fanotify.h
+++ b/include/uapi/linux/fanotify.h
@@ -40,6 +40,9 @@
 #define FAN_UNLIMITED_MARKS     0x00000020
 #define FAN_ENABLE_AUDIT        0x00000040
 
+/* Flags to determine fanotify event format */
+#define FAN_REPORT_TID          0x00000100      /* event->pid is thread id */
+
 /* Deprecated - do not use this in programs and do not add new flags here! */
 #define FAN_ALL_INIT_FLAGS      (FAN_CLOEXEC | FAN_NONBLOCK | \
                                  FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\