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filebuf::setbuf

Usage

   #include <fstream.hpp>
   streambuf *filebuf::setbuf(char *memory, int length);

Description

   Nominally offers a buffer area for use by the filebuf. The offer is
   ignored unless memory is zero, or if its length is less than or equal to
   zero, in which case unbuffered operation is initiated.

Example 

   filebuf fb(fd);
   ...;        // buffered operations

   fb.setbuf(0,0);
   ...;        // unbuffered operations

Return Value

   A pointer to the streambuf for which it was called if the operation
   succeeded (unbuffered operation initiated), zero otherwise.