| FFLUSH(3) | Library Functions Manual | FFLUSH(3) |
fflush, fpurge —
#include <stdio.h>
int
fflush(FILE
*stream);
int
fpurge(FILE
*stream);
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).
EOF
is returned and the global variable errno is set to
indicate the error.
EBADF]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).
fflush() function conforms to ANSI
X3.159-1989 (“ANSI C89”).
fflush() function first appeared in
Version 7 AT&T UNIX.
| November 4, 2015 | OpenBSD-current |