[Devel] Re: [PATCH 11/11][v3]: Enable multiple instances of devpts

[sukadev at us.ibm.com]

H. Peter Anvin [hpa at zytor.com] wrote:
> sukadev at us.ibm.com wrote:
>> 	2. To effectively use the multi-instance mode, applications/libraries
>> 	    should, open "/dev/pts/ptmx" instead of "/dev/ptmx" but obviously
>> 	    this would fail in the legacy mode.
>> 	
>
> NOT SO!
>
> /dev/ptmx is required by Unix98 (which is arguably obsolete, but still.)  
> Applications SHOULD NOT try to open /dev/pts/pmtx.  This should be 
> considered strictly an internal implementation detail.

Ah, ok.  Well, I will remove that para from the patch description.

If the -o newinstance is NOT followed by the bind mount, ptys won't
work and would be nice if we can print a useful message when opening
/dev/ptmx.

>
> Applications should use posix_openpt(), openpty() or forkpty(); libraries 
> should use /dev/ptmx.
>
> 	-hpa
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