Messages in this thread | | | Subject | Re: [PATCH] devpts: Sensible /dev/ptmx & force newinstance | From | "H. Peter Anvin" <> | Date | Fri, 11 Dec 2015 14:18:18 -0800 |
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On 12/11/15 14:12, Andy Lutomirski wrote: >> >> For the newinstance case st_dev should match between the master and the >> slave. Unfortunately this is not the case for a legacy ptmx, as a >> stat() on the master descriptor still returns the st_dev, st_rdev, and >> st_ino for the ptmx device node. > > Sure, but I'm not talking about stat. I'm saying that we could add a > new ioctl that works on any ptmx fd (/dev/ptmx or /dev/pts/ptmx) that > answers the question "does this ptmx logically belong to the given > devpts filesystem". > > Since it's not stat, we can make it do whatever we want, including > following a link to the devpts instance that isn't f_path or f_inode. >
Sure. My thinking, though, was whether or not we can do something that works on legacy kernels, and/or is less intrusive than new ioctls.
What is the actual operation we need?
-hpa
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