guest_kill requires killpg(1000, ...) to fail with ESRCH, but getpid
returns the host process id. When Windows gives the test process id
1000, group 1000 is the caller's own, killpg succeeds as the test itself
requires for killpg(self, 0), and Require aborts with 0xc0000409. Use
self + 1000, which is never the caller's group.
ProsperoStore (PPSA99000) imports kill from libkernel and stops at it on
current main. Its crash reporter resets a crash signal to SIG_DFL and
sends it again with kill(getpid(), signal).
kill follows FreeBSD's kern_kill and killpg1 for the only guest process:
EINVAL for signals outside 0 to 128, signal 0 only checks the target,
and the caller's own pid, 0 and minus its pid deliver through raise.
Any other pid, and -1, which skips the caller, report ESRCH.
ionut27001