Jan, Roland, I have the question. Currently, if a tracer does ptrace(DETACH, tracee, SIGXXX) and then another/same tracer does ptrace(ATTACH, tracee) then SIGXXX will not be reported to the new tracer.
Why? Should utrace-ptrace be 100% compatible here? It is not trivial to implement, and I don't understand why it is important to keep this behaviour. But we have the test case which checks this: attach-into-signal. Could you explain what can be breaked if SIGXXX will be reported to the next tracer (assuming the 2nd ATTACH is fast enough) ? I do not think there is a "real life" application that does ATTACH + DETACH and relies on fact it must not see this sig. Oleg.
