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setvbuf
=======

Syntax
------

     #include <stdio.h>
     
     int setvbuf(FILE *file, char *buffer, int type, int length);

Description
-----------

This function modifies the buffering characteristics of FILE.  First,
if the file already has a buffer, it is freed.  If there was any
pending data in it, it is lost, so this function should only be used
immediately after a call to `fopen'.

If the TYPE is `_IONBF', the BUFFER and LENGTH are ignored and the file
is set to unbuffered mode.

If the TYPE is `_IOLBF' or `_IOFBF', then the file is set to line or
fully buffered, respectively.  If BUFFER is `NULL', a buffer of size
SIZE is created and used as the buffer.  If BUFFER is non-`NULL', it
must point to a buffer of at least size SIZE and will be used as the
buffer.

setbuf:.  setbuffer:.  setlinebuf:.         

Return Value
------------

Zero on success, nonzero on failure.

Example
-------

     setbuf(stderr, NULL, _IOLBF, 1000);