Manpage of FREAD

FREAD

Section: Linux Programmer's Manual (3)
Updated: 2015-07-23
Index
 

NAME

fread, fwrite - binary stream input/output  

SYNOPSIS

#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);
 

DESCRIPTION

The function fread() reads nmembitems of data, each sizebytes long, from the stream pointed to by stream, storing them at the location given by ptr.

The function fwrite() writes nmembitems of data, each sizebytes long, to the stream pointed to by stream, obtaining them from the location given by ptr.

For nonlocking counterparts, see unlocked_stdio(3).  

RETURN VALUE

On success, fread() and fwrite() return the number of items read or written. This number equals the number of bytes transferred only when sizeis 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.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
fread(), fwrite() Thread safetyMT-Safe
 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, C89.  

SEE ALSO

read(2), write(2), feof(3), ferror(3), unlocked_stdio(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
CONFORMING TO
SEE ALSO

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