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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | 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 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 │
└──────────────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008, C89.
read(2), write(2), feof(3), ferror(3), unlocked_stdio(3)
This page is part of release 4.12 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/.
GNU 2015-07-23 FREAD(3)
Pages that refer to this page: pmlogger(1), read(2), write(2), fgetc(3), getline(3), gets(3), getw(3), puts(3), setbuf(3), stdin(3)