FREAD(3)                       Library Routines                       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/C.



GNO                            15 September 1997                      FREAD(3)