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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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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.1‐2017 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.1‐2017, stdio.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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.opengroup.org/unix/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 2017 SETBUF(3P)
Pages that refer to this page: stdio.h(0p), fputc(3p), fputwc(3p), setvbuf(3p), stdin(3p), ungetc(3p), ungetwc(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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