"Nadav Har'El" <[EMAIL PROTECTED]> writes:
> > As a test u can also try fflush(NULL); which flushes
> > all the opened streems.
>
> Right, but as far as I know this is not a standard thing. As well as
> doing a rather stupid thing to do, because you usually know which
> stream you should flush, and doing fflush(NULL) might flush
> something you didn't want to (e.g., imagine some library opening a
> file you aren't aware of).
The same fflush(3) man page on Linux says
If the stream argument is NULL, fflush flushes all open
output streams.
NB: output streams only.
Further down the man page:
CONFORMING TO
The fflush function conforms to ANSI X3.159-1989 (``ANSI
C'').
FWIW, there is also
NOTES
Note that fflush only flushes the user space buffers pro
vided by the C library. To ensure that the data is physi
cally stored on disk the kernel buffers must be flushed
too, e.g. with sync(2) or fsync(2).
I'd say, as a rule of thumb, that fflush(3) is a very blunt tool and
should not be used lightly. This is especially true about
fflush(NULL). If you want to change the default
buffering settingsit is cleaner to use setbuf(3) and friends
consistently rather than call fflush(3) at odd places.
--
Oleg Goldshmidt | [EMAIL PROTECTED]
"We work by wit, and not by witchcraft,
And wit depends on dilatory time..."
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