fflush(3)

NAME

       fflush - flush a stream

SYNOPSIS

       #include <stdio.h>

       int fflush(FILE *stream);

DESCRIPTION

       The  function  fflush  forces a write of all buffered data
       for the given output or update  stream  via  the  stream's
       underlying  write function.  The open status of the stream
       is unaffected.

       If the stream argument is NULL, fflush  flushes  all  open
       output streams.

RETURN VALUES

       Upon  successful completion 0 is returned.  Otherwise, EOF
       is returned and the global variable errno is set to  indi­
       cate the error.

ERRORS

       EBADF  Stream  is  not  an open stream, or is not open for
              writing.

       The function fflush may also fail and set errno for any of
       the errors specified for the routine write(2).

SEE ALSO

       write(2), fopen(3), fclose(3), setbuf(3)

CONFORMING TO

       The  fflush  function conforms to ANSI C3.159-1989 (``ANSI
       C'').