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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 (consult 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
       The functionality described on this reference page is aligned with  the
       ISO C  standard.  Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1-2008
       defers to the ISO C standard.
       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
       Although  the  setvbuf()  interface  may set errno in defined ways, the
       value of errno after a call to setbuf() is unspecified.
       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.
       Since  errno  is  not  required to be unchanged on success, in order to
       correctly detect and possibly recover from errors, applications  should
       use setvbuf() instead of setbuf().
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       Section 2.5, Standard I/O Streams, fopen(), setvbuf()
       The Base Definitions volume of POSIX.1-2008, <stdio.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                           SETBUF(3P)