RE: Socket buffer usage

ioctl(FIONREAD)

-----Original Message-----
From: owner-freebsd-hackers@xxxxxxxxxxx [mailto:owner-freebsd-
hackers@xxxxxxxxxxx] On Behalf Of Ivan Voras
Sent: Sunday, April 08, 2012 6:17 AM
To: freebsd-hackers
Subject: Socket buffer usage

Hi,

I'm tracking down an obscure bug in my userland program and it might
have something to do with the way I write&read data through a (Unix
domain) socket. I'm setting SO_SNDBUF and SO_RCVBUF, and what I'm
looking for is some way to query the amount of TX & RX buffered / free
data on a socket. Is there something I can use? I'll even accept
inspecting kernel structures if explained in detail and can be done on
a running system.

Alternatively, is there anything else which could cause poll(2) with
POLLOUT on a socket to return no events ready on such a socket? (my
expectation being that a socket is always ready to be written to if
there is buffer space free...).
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