CVS commit: src/sys

["Christos Zoulas" <christos%netbsd.org@localhost>]

Module Name:    src
Committed By:   christos
Date:           Sun Apr  5 20:53:17 UTC 2020

Modified Files:
        src/sys/kern: kern_exec.c kern_fork.c kern_sig.c
        src/sys/sys: signalvar.h

Log Message:
- Untangle spawn_return by splitting it up to sub-functions.
- Merge the eventswitch parent notification code which was copied in two
  places (eventswitchchild)
- Fix bugs in the eventswitch parent notification code:
  1. p_slflags should be accessed holding both proc_lock and p->p_lock
  2. p->p_opptr can be NULL if the parent was PSL_CHTRACED and exited.

Fixes random crashes the posix_spawn_kill_spawner unit test which tried
to dereference a NULL pptr.


To generate a diff of this commit:
cvs rdiff -u -r1.493 -r1.494 src/sys/kern/kern_exec.c
cvs rdiff -u -r1.219 -r1.220 src/sys/kern/kern_fork.c
cvs rdiff -u -r1.385 -r1.386 src/sys/kern/kern_sig.c
cvs rdiff -u -r1.100 -r1.101 src/sys/sys/signalvar.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.