Re: UDP recvmsg blocks after select(), 2.6 bug?

Richard B. Johnson
2004-10-06T15:17:20Z

On Wed, 6 Oct 2004, David S. Miller wrote:

> On Wed, 6 Oct 2004 16:52:27 +0200 (CEST)
> Joris van Rantwijk <joris@eljakim.nl> wrote:
>
>> My understanding of POSIX is limited, but it seems to me that a read call
>> must never block after select just said that it's ok to read from the
>> descriptor. So any such behaviour would be a kernel bug.
>
> There is no such guarentee.

Huh? Then why would anybody use select()? It can't return a
'guess" or it's broken. When select() or poll() claims that
there are data available, there damn well better be data available
or software becomes a crap-game. And, if you've decided that
such a game-of-chance is okay then please keep your software
out of the new Ethernet Avionics Buses that Airbus now is using.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.5-1.358-noreg on an i686 machine (5537.79 BogoMips).
Note 96.31% of all statistics are fiction.