Command::detach can cause zombie processes

[carllerche]

Properly spawning a detached process requires double forking in order to avoid zombie processes:

http://www.linuxjedi.co.uk/2014/02/why-use-double-fork-to-daemonize.html

I did not see this happening in https://github.com/rust-lang/rust/blob/master/src/libnative/io/process.rs

cc @aturon @alexcrichton

[aturon]

I'd be glad to take a look at this.

Is this a blocking issue for skylight?

[carllerche]

Our requirements are pretty simple, so we are going to just bind http://man7.org/linux/man-pages/man3/daemon.3.html for now. Our parent process stays around for a while and could repeatedly spawn of daemons so zombies would be a pretty bad thing in our case.

[steveklabnik]

I wonder how this sorted out with the IO RFC.

[alexcrichton]

This was removed from Command (partly for the reasons stated here) and we should be able to add the option backwards-compatibly to Command. This issue specifically, however, I'm going to close as it's no longer relevant. I'm sure it will definitely come back up when re-adding the option, however!