Re: too many close calls for non-opened fds

On Wed, Aug 16, 2006 at 02:25:05PM -0700, Carson Gaspar wrote:
> --On Wednesday, August 16, 2006 10:56 PM +0200 Markus Friedl
> <markus.r.friedl@arcor.de> wrote:
>
> > if a file is opened and the resource limit is decreased,
> > then looping to the resource limit will miss some open files.
>
> Does any UNIX variant have a "close all my open fds except for these"
> syscall? Or an easy way to get back a list of in-use fds? I really wish
> such a beast would be added, as calling close() on all possible fd numbers
> is _such_ a hack...
>

OpenBSD has closefrom(2) and AIX has an fcntl capability using F_CLOSEM. On
Linux you can read the entries in /proc/$$/fd--see
openbsd-compat/closefrom.c in the OpenSSH source--however that wouldn't work
in a chroot environment.

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