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Re: Problem with socketpair , AF_UNIX and select call - can anybody through any light on this!

On Fri, Oct 12, 2007 at 11:29:26AM +0100, Andy Green wrote:
> Somebody in the thread at some point said:
> > The SOCK_DGRAM is because I have small packets flowing that I do not
> > want fragmented but do not mind if they get lost, .... but then inside a
> > machine that does not matter. However with SOCK_STREAM I get zero length
> > messages but still ready to read continuously!!! See attached!
> Why don't you try removing the O_NONBLOCK since you test with select...
>   fcntl(fd[0], F_SETFL, fcntl(fd[0], F_GETFL, 0) | O_NONBLOCK);
>   fcntl(fd[1], F_SETFL, fcntl(fd[1], F_GETFL, 0) | O_NONBLOCK);

In some instances it is possible to select to return OK and an operation
then blocks. So it is always best to use select/poll, have the fds set
non-block, and check for EINTR/EAGAIN.


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