Topic       : Pure C Library Documentation
Author      : John Kormylo
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Subject     : Documentation/Pure C Library
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View Ref-File[ File I/O Write Buffer                           Fcntl Command Code ]

Fcntl( FIONWRITE, (long) &len, f );

  <len> returns the number of bytes left (long).
  <f> is an open I/O handle.


Function returns the number of bytes which can be written to the I/O
buffer before the physical device must be accessed.