PT_TRACE_ME
ATF_REQUIRE(ptrace(PT_TRACE_ME, 0, NULL, 0) == 0);
ATF_REQUIRE_ERRNO(EBUSY, ptrace(PT_TRACE_ME, 0, NULL, 0) == -1);
ptrace(PT_TRACE_ME, 0, 0, 0);
ptrace(PT_TRACE_ME, 0, 0, 0);
CHILD_REQUIRE(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
ptrace(PT_TRACE_ME, 0, 0, 0);
case PT_TRACE_ME:
case PT_TRACE_ME: