With --[bg-]daemon and Type=forking, systemd will only consider the
daemon to have fully started up once the original process exits, and
will wait until then to start units depending on the Emacs service. To
get the same functionality with --fg-daemon, use Type=notify instead of
Type=simple and explicitly send a readiness notification to systemd at
the point where the forked process would in --bg-daemon mode notify its
parent process and cause it to exit. Similarly, notify systemd at the
beginning of the shutdown process as well. (Both of these calls are
successful no-ops if emacs was not started by systemd.)
* etc/emacs.service: Update Type.
* src/emacs.c (daemon-initialized) [HAVE_LIBSYSTEMD]:
* src/emacs.c (kill-emacs) [HAVE_LIBSYSTEMD]: Call sd_notify().
This is intended for modern init systems such as systemd,
which manage many of the traditional aspects of daemon behavior
themselves. (Bug#2677)
* src/emacs.c (daemon_type): New integer.
(usage, standard_args): Add --old-daemon and --new-daemon.
(main): Handle --old-daemon and --new-daemon arguments.
Restrict all the forking and complicated daemon stuff to old-daemon.
(Fdaemon_initialized): Handle new-style daemon.
* src/lisp.h (IS_DAEMON, DAEMON_RUNNING) [!WINDOWNT]:
Replace daemon_pipe with daemon_type.
* doc/emacs/cmdargs.texi (Initial Options):
* doc/emacs/glossary.texi (Glossary):
* doc/emacs/misc.texi (Emacs Server):
* doc/lispref/display.texi (Window Systems):
* doc/lispref/os.texi (Startup Summary): Related doc updates.
* etc/NEWS: Mention this.
* etc/emacs.service: Use Type=simple and --new-daemon.
