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FREAD(3)		   Linux Programmer's Manual		      FREAD(3)

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 nmemb elements of data, each size bytes long, from the stream pointed to by stream, storing them at the loca- tion 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 loca- tion given by ptr. For non-locking counterparts, see unlocked_stdio(3).

RETURN VALUE

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.

CONFORMING TO

C89, POSIX.1-2001.

SEE ALSO

read(2), write(2), feof(3), ferror(3), unlocked_stdio(3) BSD MANPAGE 1996-05-17 FREAD(3)

1994 Man-cgi 1.15, Panagiotis Christias <christia@theseas.ntua.gr>