Re: fanotify read returns with errno == EOPENSTALE

Amir Goldstein [off-list ref]:

Sorry I messed up the previous patch. please try this one:

I will try it.

+                        * do the right thing if there are no more events to
+                        * read (i.e. return bytes read, -EAGAIN or wait).

EAGAIN is the right thing to do when FAN_NONBLOCK has been specified.
Without FAN_NONBLOCK, EAGAIN is bound to confuse the application. That
could be documented, of course.

More importantly, does EAGAIN here still guarantee EPOLLET semantics of
epoll(7)? IOW, if I get EAGAIN, I shouldn't have to try read(2)ing the
fanotify fd again before calling epoll_wait(2).


Marko