Thanks folks for the feedback, much appreciated. For the archives everything I'm using is stock Debian 10 (Buster): Perl 5.28.1 patched to hell and back, POSIX 1.84, Perl::Critic 1.132. It seemed to me also that Perl::Critic was having trouble divining the export intentions of the module so I'll stop worrying about this now. Thanks again. Oh, and yes. setsid() does actually work, has done in this application for five years and more, but I just thought I'd run it past Perl::Critic and now I almost wish I hadn't.