fwrite

NAME

       fread, fwrite - binary stream input/output

SYNOPSIS

       #include <stdio.h>

       int  fread(  void  *ptr,  size_t  size, size_t nmemb, FILE
       *stream);

       int fwrite( 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

       feof(3), ferror(3), read(2), write(2)

STANDARDS

       The functions fread and fwrite conform to ANSI C3.159-1989
       (``ANSI C'').