provide a way for kill(p) to kill the whole process group

[stevengj]

Currently, kill(p) signals only a single process. However, spawn(detach(...)) creates a new process group, and killing the parent process does not necessarily kill the child processes.

I raninto this problem in IJulia, because on MacOS p = spawn(detach(ipython notebook)) spawns a bash script that in turn spawns the actual python server, and doing kill(p) only kills the parent bash process and not the underlying python server, which is then orphaned.

(In fact, I would have thought that the default of kill should have been to kill the whole process group.)

I don't see anything in libuv to provide this. I guess you would have to call getpgrp on the process id to get the group id to kill?

[stevengj]

Hmm, it seems like (a) the process group includes Julia itself (i.e. on Unix there isn't one process group created per spawn — uv_spawn only calls setsid() before detaching a process) and (b) even killing Julia's process group doesn't kill ipython ... maybe ipython is doing something a bit odd?

So maybe there's not much we can do here, since the creation of process groups is under libuv's control?

[tkelman]

feature freeze is soon and no one has started working on this, moving to 1.0

[stevengj]

Not sure that this is even possible/desirable (see my comment above), so closing this unless the feature can be better defined.

[vtjnash]

Seems like you might be able to give it (juypter) a Pipe for it's STDIN, so that it will get a SIGPIPE when the parent (julia) died?