tree 4a61721e991c31f1baefb3b9dc503ce638e3be4b
parent 2672fb2d68949b20d98d1a8161bfb67a56d80968
author Andy Green <andy.green@linaro.org> 1361587810 +0800
committer Andy Green <andy.green@linaro.org> 1361587810 +0800

reflect send completeness in lws_write return

under load, writing packet sizes to the socket that are normally fine
can do partial writes, eg asking to write 4096 may only take 2800 of
it and return 2800 from the actual send.

Until now lws assumed that if it was safe to send, it could take any
size buffer, that's not the case under load.

This patch changes lws_write to return the amount actually taken...
that and the meaning of it becomes tricky when dealing with
compressed links, the amount taken and the amount sent differ.  Also
there is no way to recover at the moment from a protocol-encoded
frame only being partially accepted... however for http file send
content it can and does recover now.

Small frames don't have to take any care about it but large atomic
sends (> 2K) have been seen to fail under load.

Signed-off-by: Andy Green <andy.green@linaro.org>