FreeBSD/src de567a4 (r351211)tests/sys/kern pdeathsig.c

sys.kern.pdeathsig.signal_delivered_ptrace: fix startup.

Inform D that C executed procctl(PROC_PDEATHSIG_CTL).  Otherwise D
might allow B to exit before C is set up to receive a signal on the
parent exit.  In this case, C waits forever for the signal and test
hangs.

PR:     237657
Reported and tested by: lwhsu
Sponsored by:   The FreeBSD Foundation
MFC after:      1 week
DeltaFile
+9-0tests/sys/kern/pdeathsig.c
+9-01 files

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