Re: [patch 7/8] fdmap v2 - implement sys_socket2

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On Sat, 9 Jun 2007, Linus Torvalds wrote:

> IOW, the most common case for libraries is not that they get invoced to do 
> one thing, but that they get loaded and then used over and over and over 
> again, and the _reason_ for wanting to have a file descriptor open may 
> well be that the library wants to cache the file descriptor, rather than 
> having to open a file over and over again!

for an example of a library wanting to cache an open fd ... and failing 
miserably at protecting itself from the application closing its fd read:

http://bugzilla.padl.com/show_bug.cgi?id=304
http://bugzilla.padl.com/show_bug.cgi?id=305

basically libnss-ldap is trying to use getsockname/getpeername to prove 
that an fd belongs to it.  the failure modes are quite delightful.

-dean
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