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Re: How to access /dev/ttyS* ?

On Apr 26 11:48, Ryan Johnson wrote:
> Hi all,
> I'm trying to connect a VirtualBox guest's serial port to something
> that cygwin/gdb can access for remote debugging, and am having
> trouble connecting the pieces...
> One post from a couple of years ago [1] suggests using /dev/ttyS* to
> access COM ports. This would work great... except there are no
> /dev/ttyS* on my install.

If the VM has a virtual HW serial port configured, you should see a
/dev/ttyS0 entry.  If it's not there, you didn't configure it.  Cygwin
in the guest can only access what is available in the guest OS.  If
there's a COM1, Cygwin has a /dev/ttyS0.

> The other VirtualBox option is to create a named pipe (as in Windows
> NPFS), and then wrap it into a pty using socat [2], but I can't
> figure out how to access such a pipe from cygwin -- the "\\.\pipe\*"
> path doesn't seem to be supported by cygpath and there's nothing
> obvious in /dev/.

I don't know how that's supposed to work, but you could try to
connect it via /proc/sys/Device/NamedPipe/<name-of-named-pipe>
No guarantee that it works, though.


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

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