Re: too many close calls for non-opened fds

On Thu, Aug 17, 2006 at 05:49:36PM +0530, Logu wrote:
> I thought this issue occurs from openssh-3.9 because of introduction of
> re-exec feature.
> I tried by disabling the re-exec feature and still I see a large number of
> close() calls during connection.

If you run sshd with "-r", how many close() calls do you see per connection?

If it's 60 or so then session.c does this:

/*
* Close any extra open file descriptors so that we don't have them
* hanging around in clients. Note that we want to do this after
* initgroups, because at least on Solaris 2.3 it leaves file
* descriptors open.
*/
for (i = 3; i < 64; i++)
close(i);

but I can't see that having a significant performance impact.

--
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69
Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
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