NAME    [Toc]    [Back]

     fflush, fpurge - flush a stream

SYNOPSIS    [Toc]    [Back]

     #include <stdio.h>

     int
     fflush(FILE *stream);

     int
     fpurge(FILE *stream);

DESCRIPTION    [Toc]    [Back]

     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.

     The function fpurge() erases any input or output buffered in
the given
     stream.  For output streams this discards any unwritten output.  For input
 streams this discards any input read from the underlying
object but
     not yet obtained via getc(3); this includes any text  pushed
back via
     ungetc(3).

RETURN VALUES    [Toc]    [Back]

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

ERRORS    [Toc]    [Back]

     [EBADF]       stream is not an open stream, or, in the  case
of fflush(),
                   not a stream 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    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

     The fflush() function conforms to ANSI  X3.159-1989  (``ANSI
C'').

OpenBSD      3.6                           June      4,      1993