Kyle Evans
ee9895e10d
The practical scenario that leads to this is porch(1) spawning some utility and sending it a SIGSTOP as a debugging aide. The user then attaches a debugger and walks through how some specific input is processed, then detaches to allow the script to continue. When ptrace is detached, the process resumes execution but the parent is never notified and may be stuck in wait(2) for it to continue or terminate. Other platforms seem to re-suspend the process after the debugger is detached, but neither behavior seems unreasonable. Just notifying the parent that the child has resumed is a relatively low-risk departure from our current behavior and had apparently been considered in the past, based on pre-existing comments. Move p_flag and p_xsig handling into childproc_continued(), as just sending the SIGCHLD here isn't really useful without P_CONTINUED set and the other caller already sets these up as well. Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D50917
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