On Tue, Sep 18, 2007 at 10:10:42PM -0500, M.H.VanLeeuwen wrote:
> Hi,
>
> When event_add(&ev, &tv) returns -1, what is the proper way to clean up.
>
> For example function XYZZY() takes socket fd as an argument
>
> XYZZY(int sockfd)
> {
> allocate event structure related memory...
> ...
> event_set(&(event->event), sockfd, EV_TIMEOUT | EV_WRITE |
> EV_PERSIST, connected, &(event->event));
> ret = event_base_set(event_base, &(event->event));
>
> if (ret == 0)
> {
> ret = event_add(&(event->event), &CONNECT_WAIT);
> }
>
> if (ret != 0)
> {
> // What is the proper action to take here?
> return FAIL;
> }
> ...
> return SUCCESS;
> }
The only way to receive a non-zero retval from event_add is if the
underlying event notification mechanism returns a non-zero value
to event_add. In order to determine which event mechanism that is,
we need more information like which OS you're experiencing this under
and/or the particular event mechanism you're using (set the following
shell variable before executing your code: EVENT_SHOW_METHOD=1).
Without knowing more than that all one can say is that if event_add()
returns -1, it is programming error, somewhere. I speculate possibly
your fd is invalid or previously closed or something else is wrong.
> The reason I ask is that it seems event_add() will continue to time for
> CONNECT_WAIT time
> even if it returns -1, failure. Shouldn't event_add(), on return of -1,
> unwind from the timer that
> it has started?
This is valid. However it's kind of a rare case.
-cl
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