fread(3) BSD Library Functions Manual fread(3)
NAME
fread, fwrite -- binary stream input/output
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
size_t
fread(void *restrict ptr, size_t size, size_t nitems,
FILE *restrict stream);
size_t
fwrite(const void *restrict ptr, size_t size, size_t nitems,
FILE *restrict stream);
DESCRIPTION
The function fread() reads nitems objects, each size bytes long, from the
stream pointed to by stream, storing them at the location given by ptr.
The function fwrite() writes nitems objects, each size bytes long, to the
stream pointed to by stream, obtaining them from the location given by
ptr.
RETURN VALUES
The functions fread() and fwrite() advance the file position indicator
for the stream by the number of bytes read or written. They return the
number of objects read or written. If an error occurs, or the end-of-
file is reached, the return value is a short object count (or zero).
The function fread() does not distinguish between end-of-file and error;
callers must use feof(3) and ferror(3) to determine which occurred. The
function fwrite() returns a value less than nitems only if a write error
has occurred.
SEE ALSO
read(2), write(2)
STANDARDS
The functions fread() and fwrite() conform to ISO/IEC 9899:1990
(``ISO C90'').
BSD March 8, 1994 BSD
Mac OS X 10.8 - Generated Mon Aug 27 18:28:48 CDT 2012