Socket buffer usage

[Eduardo Morras]

At 23:16 07/04/2012, you wrote:
>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...).

Setting fd to -1 in pollfd struct resets revents. Perhaps you have 
not setted fd properly.

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