SPUG: A bug?
itayf at fhcrc.org
Wed Jul 16 14:54:53 CDT 2003
So it was a bug, albeit a one in my 'program' ... Thanks :-)
On Tue, 15 Jul 2003, Yitzchak Scott-Thoennes wrote:
> On Tue, 15 Jul 2003 15:16:59 -0700 (PDT), itayf at fhcrc.org wrote:
> > 'ioctl-test.pl FILE'
> > 'Inappropriate ioctl for device'
> >and fails when tested for $!.
> >In contrast,
> > 'cat FILE | ioctl-test.pl'
> >prints nothing (as expected? :-).
> $! is meaningless unless there has been an error. When <> (aka readline)
> returns undef and you want to check for an error, first call eof. If
> it wasn't eof, then check $!.
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