FREAD(3)                  OpenBSD 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 objects, each size bytes long, from the
     stream pointed to by stream, storing them at the location given by ptr.

     The function fwrite() writes nmemb 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,
     and callers must use feof(3) and ferror(3) to determine which occurred.
     The function fwrite() returns a value less than nmemb only if a write er-
     ror has occurred.

SEE ALSO
     read(2),  write(2)

STANDARDS
     The functions fread() and fwrite() conform to ANSI X3.159-1989 (``ANSI
     C'').

OpenBSD 2.6                      March 8, 1994                               1