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A comment on POSIX close(2) is broken. Parent comment

Re:POSIX close(2) is broken by cperciva on Saturday December 17, 2011 @06:31AM (#3364048)
Maybe your man page says that, but POSIX says

    The dup2() function may fail if:
    [EIO]
        An I/O error occurred while attempting to close fildes2.
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