File: fread.3

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.\" 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.
.\"
.\" 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.
.\"
.\"     @(#)fread.3	6.6 (Berkeley) 6/29/91
.\"
.\" Converted for Linux, Mon Nov 29 15:37:33 1993, faith@cs.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 <jrv@vanzandt.mv.com>
.\" Modified Fri May 17 10:21:51 1996 by Martin Schulze <joey@infodrom.north.de>
.\"
.TH FREAD 3  "17 May 1996" "BSD MANPAGE" "Linux Programmer's Manual"
.SH NAME
fread, fwrite \- binary stream input/output
.SH SYNOPSIS
.B #include <stdio.h>
.sp
.BI "size_t fread( void *" ptr ", size_t " size ", size_t " nmemb ,
.BI "FILE *" stream );
.sp
.BI "size_t fwrite( const void *" ptr ", size_t " size ", size_t " nmemb ,
.BI "FILE *" stream );
.SH DESCRIPTION
The function
.B fread
reads
.I nmemb
elements of data, each
.I size
bytes long, from the stream pointed to by
.IR stream ,
storing them at the location given by
.IR ptr .
.PP
The function
.B fwrite
writes
.I nmemb
elements of data, each
.I size
bytes long, to the stream pointed to by
.IR stream ,
obtaining them from the location given by
.IR ptr .
.SH "RETURN VALUES"
.B fread
and
.B fwrite
return the number of items successfully read or written (i.e., not the
number of characters).  If an error occurs, or the end-of-file is
reached, the return value is a short item count (or zero).
.PP
.B fread
does not distinguish between end-of-file and error, and callers must use
.BR feof (3)
and
.BR ferror (3)
to determine which occurred.
.SH "SEE ALSO"
.BR feof "(3), "ferror "(3), " read "(2), " write (2)
.SH "CONFORMING TO"
The functions
.B fread
and
.B fwrite
conform to ANSI C3.159-1989 (``ANSI C'').