NAME    [Toc]    [Back]

     fread, fwrite -- binary stream input/output

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <stdio.h>

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

     size_t
     fwrite(const void * restrict ptr, size_t size, size_t nmemb,
	 FILE * restrict stream);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     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-offile
 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    [Toc]    [Back]

     read(2), write(2)

STANDARDS    [Toc]    [Back]

     The functions fread() and fwrite() conform to ISO/IEC 9899:1990
     (``ISO C89'').


FreeBSD 5.2.1			 March 8, 1994			 FreeBSD 5.2.1