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
       error has occurred.


SEE ALSO

       read(2), write(2)


STANDARDS

       The functions fread and fwrite conform to ANSI/C.



GNO                            15 September 1997                      FREAD(3)

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