On 03/11/2011 05:30 AM, Wen Congyang wrote:
> Yep, makes sense. I'm double checking whether I reliably closed the
> write end of the socket in all paths, and it may boil down to changing
> the child to_always_ sendmsg even if there is no fd to send. I'm still
> thinking about it.
Using SOCK_STREAM instead of SOCK_DGRAM to create socketpair can resolve this
problem. But I don't know why.
At least with AF_INET that would be obvious: with SOCK_STRAM exiting the
child will close the connection. With a datagram socket, the parent can
still wait for other messages to the same UDP port.
I have no idea whether things work the same for AF_UNIX, but apparently
they do. :)
Paolo
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