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CRTL, Feature Logical Names, DECC$SELECT_IGNORES_INVALID_FD
 *Conan The Librarian 

    With DECC$SELECT_IGNORES_INVALID_FD enabled, select fails with
    errno set to EBADF when an invalid file descriptor is specified
    in one of the descriptor sets.

    With DECC$SELECT_IGNORES_INVALID_FD disabled, select ignores
    invalid file descriptors.
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