kqueue oddity

[Václav Haisman]

Hi,
I have a little problem with kqueue/kevent. I am getting somewhat
strange events from kevent(). The struct kevent's contents looks like this:

kevent {.ident =  1, .filter = 0xfffffffe, .flags = 0x0001, .fflags =
0x00000000, .data = 0x000084c6}

.ident == 1 is stdout.
.filter == 0x fffffffe is -2 is EVFILT_WRITE which makes sense for stdout.
.fflags is empty, nothing out of ordinary for EVFILT_WRITE.
And here comes the oddity: .flags == 0x0001 means EV_ADD which totally
doesn't make sense to me and neither does according to man kqueue. The
code that exhibits this behaviour is io_loop_handler_run() in
ioloop-kqueue.c of Dovecot IMAP server.

I have re-read the docs more than once but I haven't noticed any sign of
that EV_ADD could be set for EVFILT_WRITE filter when I am receiving the
events through kevent() funtion. I am out of ideas what to do with it.

So I am asking all you hackers for any ideas of what might be going
wrong. Is it the code in Dovecot or is it FreeBSD that is doing
something wrong?


Vaclav Haisman

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