SIGUSR1 to xinit

[Mouse]

>>          if (ParentProcess > 1) {
>>              kill(ParentProcess, SIGUSR1);
>>          }

>> This means startup is slow (a timeout) if xinit happens to be pid 1.
>> On linux, this is the case when xinit is launched into a new PID
>> namespace.

I don't know to what extent anyone else agrees with me, but my stance
on this would be "don't do that, then".  "PID 1 is init" is so
ingrained in the UNIX way that I would even go so far as to call it a
bug for Linux to be handing out PID 1 to anything but init under any
circumstances.

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