emacs --daemon doesn't successfully start the server

Question

I am attempting to set up a systemd daemon for emacs in NixOS. When I added a systemd unit, I noticed that it was continually restarting over and over again.

I discovered that this was because when I ran emacs --daemon, it would show all the initialization and then return, but when I ran ps -e | grep emacs, nothing would show up, so I assume that it forked a background process that somehow failed. The output from emacs --daemon is below.

How can I either get emacs --daemon to not fail after forking, or at least figure out how to debug the forked process?

Warning: due to a long standing Gtk+ bug
http://bugzilla.gnome.org/show_bug.cgi?id=85715
Emacs might crash when run in daemon mode and the X11 connection is unexpectedly lost.
Using an Emacs configured with --with-x-toolkit=lucid does not have this problem.
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