fread, fwrite — binary stream input/output
#include <stdio.h>
size_t
fread( |
void *ptr, |
| size_t size, | |
| size_t nmemb, | |
FILE *stream); |
size_t
fwrite( |
const void *ptr, |
| size_t size, | |
| size_t nmemb, | |
FILE *stream); |
The function fread() reads
nmemb items of data,
each size bytes long,
from the stream pointed to by stream, storing them at the
location given by ptr.
The function fwrite() writes
nmemb items of data,
each size bytes long,
to the stream pointed to by stream, obtaining them from the
location given by ptr.
For nonlocking counterparts, see unlocked_stdio(3).
On success, fread() and
fwrite() return the number of
items read or written. This number equals the number of bytes
transferred only when size is 1. If an error occurs,
or the end of the file is reached, the return value is a
short item count (or zero).
fread() does not distinguish
between end-of-file and error, and callers must use feof(3) and ferror(3) to determine
which occurred.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
fread(), fwrite() |
Thread safety | MT-Safe |
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (c) 1990, 1991 The Regents of the University of California. All rights reserved. This code is derived from software contributed to Berkeley by Chris Torek and the American National Standards Committee X3, on Information Processing Systems. %%%LICENSE_START(BSD_4_CLAUSE_UCB) Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed by the University of California, Berkeley and its contributors. 4. Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. %%%LICENSE_END (#)fread.3 6.6 (Berkeley) 6/29/91 Converted for Linux, Mon Nov 29 15:37:33 1993, faithcs.unc.edu Sun Feb 19 21:26:54 1995 by faith, return values Modified Thu Apr 20 20:43:53 1995 by Jim Van Zandt <jrvvanzandt.mv.com> Modified Fri May 17 10:21:51 1996 by Martin Schulze <joeyinfodrom.north.de> |