NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | SEE ALSO | COLOPHON
FREAD(3) Linux Programmer's Manual FREAD(3)
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 elements 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 elements of data, each size bytes long, to
the stream pointed to by stream, obtaining them from the location given by
ptr.
For non-locking counterparts, see unlocked_stdio(3).
fread() and 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).
fread() does not distinguish between end-of-file and error, and callers must
use feof(3) and ferror(3) to determine which occurred.
C89, POSIX.1-2001.
read(2), write(2), feof(3), ferror(3), unlocked_stdio(3)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 1996-05-17 FREAD(3)