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+<HTML>
+<HEAD>
+<TITLE>setbuf(3)</TITLE>
+</HEAD>
+<BODY>
+<H1>setbuf(3)</H1>
+<HR>
+<PRE>
+
+</PRE>
+<H2>NAME</H2><PRE>
+     setbuf, setvbuf - assign buffering to a stream
+
+
+</PRE>
+<H2>SYNOPSIS</H2><PRE>
+     <STRONG>#include</STRONG> <STRONG>&lt;stdio.h&gt;</STRONG>
+
+     <STRONG>int</STRONG> <STRONG>setbuf(FILE</STRONG> <STRONG>*</STRONG><EM>stream</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>buf</EM><STRONG>)</STRONG>
+     <STRONG>int</STRONG> <STRONG>setvbuf(FILE</STRONG> <STRONG>*</STRONG><EM>stream</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>buf</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>type</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>size</EM><STRONG>)</STRONG>
+
+
+</PRE>
+<H2>DESCRIPTION</H2><PRE>
+     The three types of buffering available are  unbuffered,  block  buffered,
+     and  line  buffered.   When  an  output stream is unbuffered, information
+     appears on the destination file or terminal as soon as written;  when  it
+     is  block  buffered  many characters are saved up and written as a block;
+     when it is line buffered characters are  saved  up  until  a  newline  is
+     encountered  or  input is read from stdin.  <STRONG>Fflush</STRONG> (see <STRONG><A HREF="../man3/fclose.3.html">fclose(3)</A></STRONG>) may be
+     used to force  the  block  out  early.   Normally  all  files  are  block
+     buffered.   A  buffer  is  obtained from <STRONG><A HREF="../man3/malloc.3.html">malloc(3)</A></STRONG> upon the first <STRONG>getc</STRONG> or
+     <STRONG><A HREF="../man3/putc.3.html">putc(3)</A></STRONG> on the file.  If the standard stream <STRONG>stdout</STRONG> refers to a  terminal
+     it is line buffered.  The standard stream <STRONG>stderr</STRONG> is always unbuffered.
+
+     <STRONG>Setbuf</STRONG> is used after a stream has been opened but before it  is  read  or
+     written.   The  character  array  <EM>buf</EM> is used instead of an automatically
+     allocated buffer.  If <EM>buf</EM> is the constant pointer <STRONG>NULL</STRONG>, input/output will
+     be  completely  unbuffered.   A manifest constant <STRONG>BUFSIZ</STRONG> tells how big an
+     array is needed:
+
+          <STRONG>char</STRONG> buf[BUFSIZ];
+
+     <STRONG>Setvbuf</STRONG>, an alternate form of <STRONG>setbuf</STRONG>, is used after  a  stream  has  been
+     opened but before it is read or written.  It has three uses, depending on
+     the value of the <EM>type</EM> argument:
+
+     <STRONG>setvbuf(</STRONG><EM>stream</EM><STRONG>,</STRONG> <EM>buf</EM><STRONG>,</STRONG> <STRONG>_IOFBF,</STRONG> <EM>size</EM><STRONG>)</STRONG>
+          Causes input/output to be fully buffered using the  character  array
+          <EM>buf</EM>  whose  size  is determined by the <EM>size</EM> argument.  If <EM>buf</EM> is the
+          constant pointer <STRONG>NULL</STRONG>, then an automatically allocated  buffer  will
+          be used.
+
+     <STRONG>setvbuf(</STRONG><EM>stream</EM><STRONG>,</STRONG> <EM>buf</EM><STRONG>,</STRONG> <STRONG>_IOLBF,</STRONG> <EM>size</EM><STRONG>)</STRONG>
+          Like above, except that output  will  be  line  buffered,  i.e.  the
+          buffer  will  be  flushed  when  a newline is written, the buffer is
+          full, or input is requested.
+
+     <STRONG>setvbuf(</STRONG><EM>stream</EM><STRONG>,</STRONG> <EM>buf</EM><STRONG>,</STRONG> <STRONG>_IONBF,</STRONG> <EM>size</EM><STRONG>)</STRONG>
+          Causes input/output to be completely unbuffered.  <EM>Buf</EM> and  <EM>size</EM>  are
+          ignored.
+
+
+
+     A file can  be  changed  between  unbuffered,  line  buffered,  or  block
+     buffered  by  using  <STRONG>freopen</STRONG>  (see  <STRONG><A HREF="../man3/fopen.3.html">fopen(3)</A></STRONG>) followed by the appropriate
+     <STRONG>setvbuf</STRONG> call.
+
+
+</PRE>
+<H2>SEE ALSO</H2><PRE>
+     <STRONG><A HREF="../man3/fopen.3.html">fopen(3)</A></STRONG>, <STRONG><A HREF="../man3/getc.3.html">getc(3)</A></STRONG>, <STRONG><A HREF="../man3/putc.3.html">putc(3)</A></STRONG>,  <STRONG><A HREF="../man3/malloc.3.html">malloc(3)</A></STRONG>,  <STRONG><A HREF="../man3/fclose.3.html">fclose(3)</A></STRONG>,  <STRONG><A HREF="../man3/puts.3.html">puts(3)</A></STRONG>,  <STRONG><A HREF="../man3/printf.3.html">printf(3)</A></STRONG>,
+     <STRONG><A HREF="../man3/fread.3.html">fread(3)</A></STRONG>.
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+</PRE>
+</BODY>
+</HTML>