Neal Becker wrote:
>
> >>>>> "Philip" == Philip Hazel <ph10@???> writes:
>
> [...]
> >> Surely when it re-execs itself it should pass the socket file
> >> descriptor on to the new daemon process, so that it doesn't have to be
> >> created and bound again ?
>
> Philip> On Wed, 10 Apr 1996, Lee McLoughlin wrote:
>
> >> Yes ideally it should. However it is fairly fiddly to do. A lot of exec's
> >> will close off all file descriptors unless you are careful to setup flags.
>
> So why not pass the open fd? That does sound a lot more reliable.
> Doesn't exec pass open fd's on every un*x system? Why is this 'fairly
> fiddly' to do?
You want to make sure that the only fd passed is the bound socket. So you should
flag all other fd's as close_on_exec. Which is done by different mechanisms on
different unixes. That is why it is fiddly.
--
Lee McLoughlin. Phone: +44 171 594 8388
IC-Parc, Imperial College, Fax: +44 171 594 8449
South Kensington, London. SW7 2BZ. UK. Email: L.McLoughlin@???
