Problem redirecting stderr to pipe in subprocess

Corinna Vinschen
Tue Oct 11 17:18:00 GMT 2011

On Oct 11 13:08, Christopher Faylor wrote:
> On Tue, Oct 11, 2011 at 02:17:42PM +0200, Corinna Vinschen wrote:
> >On Oct 10 18:06, Christopher Faylor wrote:
> >> When the tty layer in Cygwin was first developed, the model (either in
> >> my head or in reality) was "If you don't have a tty and open a tty, that
> >> becomes your controlling tty".  But, apparently that model changed over
> >> time to something more sensical where you have to explicitly use
> >> ioctl(TIOCSCTTY) to set up a controlling terminal.
> >
> >I don't quite understand this.  The "If you don't have a tty and open a tty,
> >that becomes your controlling tty" is standard POSIX behaviour, isn't it?
> >SUSv4 open writes:
> >
> >
> >    If set and path identifies a terminal device, open() shall not
> >    cause the terminal device to become the controlling terminal for
> >    the process. If path does not identify a terminal device,
> >    O_NOCTTY shall be ignored.
> >
> >The Linux man page contains basically the same.
> Check out the linux info page.  It's more talkative.

Uh, ok.  Thanks for the pointer.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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