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