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SETBUF(3P) POSIX Programmer's Manual SETBUF(3P)
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.
setbuf — assign buffering to a stream
#include <stdio.h>
void setbuf(FILE *restrict stream, char *restrict buf);
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.
The setbuf() function shall not return a value.
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.
None.
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().
None.
None.
Section 2.5, Standard I/O Streams, fopen(3p), setvbuf(3p)
The Base Definitions volume of POSIX.1‐2008, stdio.h(0p)
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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 SETBUF(3P)
Pages that refer to this page: stdio.h(0p), fputc(3p), fputwc(3p), setvbuf(3p), stdin(3p), ungetc(3p), ungetwc(3p)