SETBUF(3P)                                          POSIX Programmer's Manual                                         SETBUF(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       setbuf - assign buffering to a stream

SYNOPSIS
       #include <stdio.h>

       void setbuf(FILE *restrict stream, char *restrict buf);


DESCRIPTION
       Except that it returns no value, the function call:


              setbuf(stream, buf)

       shall be equivalent to:


              setvbuf(stream, buf, _IOFBF, BUFSIZ)

       if buf is not a null pointer, or to:


              setvbuf(stream, buf, _IONBF, BUFSIZ)

       if buf is a null pointer.

RETURN VALUE
       The setbuf() function shall not return a value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       A common source of error is allocating buffer space as an "automatic" variable in a code block, and then failing to close
       the stream in the same block.

       With setbuf(), allocating a buffer of BUFSIZ bytes does not necessarily imply that all of BUFSIZ bytes are used  for  the
       buffer area.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fopen(), setvbuf(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
       Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6,  Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open  Group
       Standard   is   the   referee   document.   The   original   Standard   can   be   obtained  online  at  http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                    SETBUF(3P)