FREAD (3)
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 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 .
RETURN VALUES
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.
SEE ALSO
STANDARDS
The functions
fread
and
fwrite
conform to ANSI C3.159-1989 (``ANSI C'').
man3/malloc.3
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