Messages in this thread | | | Date | Fri, 01 Aug 2008 11:12:21 -0700 | From | "H. Peter Anvin" <> | Subject | Per-instance devpts |
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Since the issue of PTY namespaces came up (and was rejected) back in April, I have thought a little bit about changing ptys to be tied directly into a devpts instance. devpts would then be a "normal" filesystem, which can be mounted multiple times (or not at all). pty's would then become private to a devpts instance.
This is what it would appear would have to change, and I'd like to get people's feeing for the user-space impact:
1. /dev/ptmx would have to change to a symlink, ptmx -> pts/ptmx. 2. Permissions on /dev/ptmx would not be persistent, and would have to be set via devpts mount options (unless they're 0666 root.tty, which would presumably be the default.) 3. The /proc/sys/kernel/pty limit would be global; a per-filesystem limit could be added on top or instead (presumably via a filesystem mount options.)
I worry #1 would have substantial user-space impact, but I don't see a way around it, since there would be no obvious way to associate /dev/ptmx with a filesystem.
-hpa
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