Follow the FreeBSD approach of not routing signals to the parent that is
a became tracer after calling PT_TRACE_ME by the vfork(2)ed child (before
exec(3)/exit(3)).
Now if a child calls raise(3), the signal is processed directly to this
child.
Add new ATF ptrace(2) tests:
- traceme_vfork_raise1 (SIGKILL)
- traceme_vfork_raise2 (SIGSTOP) // temporarily disabled
- traceme_vfork_raise3 (SIGABRT)
- traceme_vfork_raise4 (SIGHUP)
- traceme_vfork_raise5 (SIGCONT)
The FreeBSD implementation introduces P_PPTRACE for this special case.
Right know keep opencoding check of this case in the kernel. It might be
refactored in future.
The Linux kernel does not follow this approach and causes dead locking of
the processes (parent and child).
Defer handling SIGSTOP into future.
This is an intermediate step towards correct handling of fork(2) and
vfork(2) in the context of ptrace(2).
All new tests pass.
There are no regressions in existing ATF ptrace(2) tests.
Sponsored by <The NetBSD Foundation>
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