On Fri, 14 Jul 2006, Michael Lindner wrote:
[2.] Full description of the problem/report:
If a program is waiting in epoll_wait() for EPOLLOUT event on a
socket and the socket is closed, epoll_wait() returns EPOLLHUP|EPOLLERR,
but *not* EPOLLOUT.
This differs from the expected behavior in several ways:
1. epoll_wait is not returning the events it was told to wait for.
Why not return EPOLLOUT? select() returns an FD as writable on EOF.
Because it is not supposed to.
2. epoll_wait() is returning events it was not told to wait for.
Because they are non-maskeable.
3. EPOLLHUP is not returned if EPOLLIN was requested, why
do so on EPOLLOUT?
Please take a look at the POSIX docs for poll(2).
Also a minor issue - epoll_ctl doesn't check if the fd in events.data.fd
is the same as the fd that's been passed in as argument 3. If they differ
(due to programmer error), epoll_wait will return an event with the
incorrect events.data.fd specified to epoll_ctl().
That's an opaque union and epoll couldn't care less of the content.
- Davide
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