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Date:	Thu, 4 Aug 2011 00:22:06 -0400
From:	Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Device numbers, Cygwin vs. Linux
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On Wed, Aug 03, 2011 at 09:33:32PM -0500, Yaakov (Cygwin/X) wrote:
>I'm working on /proc/devices, but upon comparing to Linux[1], I
>noticed some differences in character device numbering:
>
>* /dev/tty
>Linux is 5,0, Cygwin is 3,0

You're using a snapshot.  After my pty reorg, Cygwin, probably
erroneously, effectively symlinks /dev/tty to whatever your current
"tty" is.  It will either be a pty or a console.

>* /dev/tty[N]
>Linux is 4,[N], Cygwin 136,N (major 136 is /dev/pts/N on Linux)
>
>* /dev/console
>Linux is 5,1, Cygwin is 3,0 (same as /dev/tty !)

See above.

>* /dev/ttyS[N]
>Linux is 4,[N+64], Cygwin is 117,[N]
>
>Why these differences?

I had a reason when I set up the device numbers but I don't remember any
more.  I tried to adhere to linux but there wasn't a 1-1 correspondence.
And, possibly the numbering changed over time for linux.

cgf

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