On Wed, 2 Mar 2005, Michael Haardt wrote:
> On Wed, Mar 02, 2005 at 10:14:48AM +0000, Tony Finch wrote:
> > On Wed, 2 Mar 2005, Philip Hazel wrote:
> >
> > > Opinions, please.
> >
> > Daemons should be started from a clean environment that has either closed
> > all fds or has set their close-on-exec flag.
>
> Why?
>
> Exim works fine as it is and closing all file descriptors, not knowing
> what they do, annoys subsystems that use them, e.g. debug libraries
> linked to the daemon.
The surrounding code usually has a better idea of how to clean its
environment than the daemon it is invoking. Your example is a good reason
for doing the cleaning in the invoking code rather than in the daemon
itself.
This is one of the areas in which Unix is not very good.
Tony.
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