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Added embryonic description of fcntl.lockf(). Added pointer to that
in posixfile (which is obsolescent).
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\bimodindex{posixfile}
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\indexii{posix}{file object}
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\emph{Note:} This module will become obsolete in a future release.
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The locking operation that it provides is done better and more
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portably by the \code{fcntl.lockf()} call.
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This module implements some additional functionality over the built-in
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file objects. In particular, it implements file locking, control over
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the file flags, and an easy interface to duplicate the file object.
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