Socket buffer usage

[rozhuk.im at gmail.com]

ioctl(FIONREAD)

> -----Original Message-----
> From: owner-freebsd-hackers at freebsd.org [mailto:owner-freebsd-
> hackers at freebsd.org] 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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