On Thu, Oct 15, 2020 at 12:55 PM Thomas Munro <thomas.mu...@gmail.com> wrote: > On Thu, Oct 15, 2020 at 12:14 PM Tom Lane <t...@sss.pgh.pa.us> wrote: > > I did not try to test it, but there's code that purports to handle that > > in latch.c, ~ line 1150, and the behavior it's expecting mostly agrees > > with what I read in the macOS kevent man page. One thing I'd suggest > > is that EACCES probably needs to be treated as "postmaster already dead", > > too, in case the PID is now owned by another user ID. > > Good point. I'll push that change later today.
I tried to test this on my system but it seems like maybe FreeBSD can't really report EACCES for EVFILT_PROC. From the man page and a quick inspection of the source, you only have to be able to "see" the process, and if you can't I think you'll get ESRCH, so EACCES may be for other kinds of filters. I don't currently have any Apple gear to hand, but its man page uses the same language, but on the other hand I do see EACCES in filt_procattach() in the darwin-xnu sources on github so I guess you can reach this case and get an ugly ereport (hopefully followed swiftly by a proc_exit() from the next wait on one of the long lived WESs, or a FATAL if this was the creation of one of those). Fixed. Thanks!
