DragonFly bugs List (threaded) for 2008-03
DragonFly BSD
DragonFly bugs List (threaded) for 2008-03
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short _file in stdio -> fd leak

From: Jan Schaumann <jschauma@xxxxxxxxxxxxxx>
Date: Thu, 13 Mar 2008 13:00:35 -0400


So at work we ran into a situation where a process had to fdopen more
than 32K files, which lead to a file descriptor leak.  The reason for
this leak was that while regular fds are ints, _file is a short, so if
fdopen got an fd larger than SHRT_MAX, it would get sign-extended and
thus become invalid, causing the subsequent fclose to fail.

This being FreeBSD, the fix was found and contributed back into
FreeBSD's repository by John Baldwin in
(and other files; with surrounding discussion on

This fix was also added in NetBSD in
http://mail-index.netbsd.org/source-changes/2008/03/13/msg003463.html .
I don't know if this also affects DragonFlyBSD but maybe it should
probably be looked at.


"When it's fall in New York, the air smells as if someone's been frying
goats in it, and if you are keen to breathe the best plan is to open a
window and stick your head in a building."

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