Okay, I've figured out why Socket::opt_set is unable to make a socket
blocking on OpenBSD.
The APR library -- I can only guess in an attempt to be more efficient
-- caches the state of each socket object so that it can avoid making
unnecessary system calls.
Before even trying to set the blocking or nonblocking state of a
socket, it tests whether its cache says says that the socket already
has the desired blocking state set:
if (apr_is_option_set(sock->netmask, APR_SO_NONBLOCK) != on) {
/* Then go ahead and toggle the blocking state */
}
Unfortunately, for a reason I don't yet understand, Apache seems to
think that all sockets are blocking to begin with -- even though on
OpenBSD this is not true. So when you try to set a socket to blocking,
Apache just skips your request because.. obviously there's no need to
set a blocking socket to blocking again.
The easy fix is to just get rid of the cache check if statement.
The permanent fix is to patch up the set_socket_vars() function in
srclib/apr/network_io/unix/sockets.c so that it sets blocking off by
default on OpenBSD.
I'll put together a patch to do the latter and will put it up
here. Where should I send the patch so that it gets integrated with
Apache?
Regards,
Ken
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