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Mark Hindley b96818a0fd Update changelog. 3 years ago
cb Prep 241.1: Add missing documentation for the sd-journal.h API. 4 years ago
debian Update changelog. 3 years ago
docs CODING_STYLE: fix grammar mistake 4 years ago
factory/etc/pam.d Change systemd occurences in factory/etc/pam.d to elogind. 6 years ago
man man: clarify that sd_journal_seek_head() seeks *before* the first entry 4 years ago
po Prep v242.2: Remove superfluous empty coment line in po files 4 years ago
shell-completion zsh completion: Prevent functions from clobbering each other, &c. 4 years ago
src Prep 241.2: Fix test-path-util for musl-libc based systems (#133) 4 years ago
tools Prep 241: Fix meson configure 4 years ago
.dir-locals.el Prep v234: Update root build files to upstream. 6 years ago
.gitattributes git: indicate that tabs are never OK in the systemd tree 9 years ago
.gitignore Prep 240: Move files around like upstream did. 4 years ago
.mailmap NEWS: update for final v241 4 years ago
.travis.yml .travis.yml: Identify as docker image 4 years ago
LICENSE.GPL2 relicense to LGPLv2.1 (with exceptions) 11 years ago
LICENSE.LGPL2.1 licence: remove references to old FSF address 10 years ago
Makefile Prep 241: Fixed upstream migration after tools got fixed for root files (1/8) 4 years ago
NEWS kernel-install: rename $BOOT_DIR[_ABS] to $ENTRY_DIR[_ABS] 4 years ago
README Prep 241.1: Re-add sd_is_mq(), but make it a stub 4 years ago
TODO journal: drop _packed_ attribute in a few places 4 years ago
configure Prep v235: Update root files to upstream commit 896bbe7 6 years ago Version 241.3 Release 4 years ago
meson_options.txt Prep 241.3: Enable dev-kvm-mode and grou-render-mode options 4 years ago


Elogind User, Seat and Session Manager


Elogind is the systemd project's "logind", extracted out to be a
standalone daemon. It integrates with PAM to know the set of users
that are logged in to a system and whether they are logged in
graphically, on the console, or remotely. Elogind exposes this
information via the standard org.freedesktop.login1 D-Bus interface,
as well as through the file system using systemd's standard
/run/systemd layout. Elogind also provides "libelogind", which is a
subset of the facilities offered by "libsystemd". There is a
"libelogind.pc" pkg-config file as well.

All of the credit for elogind should go to the systemd developers.
For more on systemd, see
All of the blame should go to Andy Wingo, who extracted elogind
from systemd.
All complaints should go to Sven Eden, who is maintaining elogind.


Elogind was branched from systemd version 219, and preserves the git
history of the systemd project. The version of elogind is the
upstream systemd version, followed by the patchlevel of elogind. For
example version 219.12 is the twelfth elogind release, which aims to
provide a subset of the interfaces of systemd 219.

To contribute to elogind, fork the current source code from github:
Send a pull request for the changes you like.

If you do not have a github account, the elogind wiki page at
lists further possibilities to contact the maintainers.

To chat about elogind:
#elogind on freenode

Finally, bug reports:

Why bother?

Elogind has been developed for use in GuixSD, the OS distribution of
GNU Guix. See for more on Guix. GuixSD uses a
specific init manager (GNU Shepherd), for reasons that are not relevant
here, but still aims to eventually be a full-featured distribution that
can run GNOME and other desktop environments. However, to run GNOME
these days means that you need to have support for the login1 D-Bus
interface, which is currently only provided by systemd. That is the
origin of this project: to take the excellent logind functionality
from systemd and provide it as a standalone package.

You're welcome to use elogind for whatever purpose you like --
as-is, or as a jumping-off point for other things -- but please don't
use it as part of some anti-systemd vendetta. We are appreciative of
the systemd developers logind effort and think that everyone deserves
to run it if they like. Not matter what kind of PID1 they use.

Differences relative to systemd

The pkg-config file is called libelogind, not libsystemd or

The headers are in <elogind/...>, so like <elogind/sd-login.h> instead
of <systemd/sd-login.h>.
To make it easier for projects to add support for elogind, there is a
subfolder "systemd" in the elogind include directory. So if pkg-config
is used to get the cflags, including <systemd/sd-login.h> will still

Libelogind just implements login-related functionality. It also
provides the sd-bus API.

Unlike systemd, whose logind arranges to manage resources for user
sessions via RPC calls to systemd, in elogind there is no systemd so
there is no global cgroup-based resource management. This has a few

* Elogind does not create "slices" for users. Elogind will not
record that users are associated with slices.

* The /run/systemd/slices directory will always be empty.

* Elogind does not have the concept of a "scope", internally, as
it's the same as a session. Any API that refers to scopes will
always return an error code.

On the other hand, elogind does use a similar strategy to systemd in
that it places processes in a private cgroup for organizational
purposes, without installing any controllers (see This
allows elogind to map arbitrary processes to sessions, even if the
process does the usual double-fork to be reparented to PID 1.

Elogind does not manage virtual terminals.

Elogind does monitor power button and the lid switch, like systemd,
but instead of doing RPC to systemd to suspend, poweroff, or restart
the machine, elogind just does this directly. For suspend, hibernate,
and hybrid-sleep, elogind uses the same code as systemd-sleep.
Instead of using a separate sleep.conf file to configure the sleep
behavior, this is included in the [Sleep] section of
/etc/elogind/login.conf. See the example login.conf for more. For
shutdown, reboot, and kexec, elogind shells out to "halt", "reboot",
and "kexec" binaries.

The loginctl command has the poweroff, reboot, sleep, hibernate, and
hybrid-sleep commands from systemd, as well as the --ignore-inhibitors

The PAM module is called, not

Elogind and the running cgroup controller
While 'configure' runs, it will detect which controller is in place.
If no controller is in place, configure will determine, that elogind
should be its own controller, which will be a very limited one.

This approach should generally work, but if you just have no cgroup
controller in place, yet, or if you are currently switching to
another one, this approach will fail.

In this case you can do one of the two following things:

1) Boot your system with the target init system and cgroup
controller, before configuring and building elogind, or
2) Use the --with-cgroup-controller=name option.

Example: If you plan to use openrc, but openrc has not yet booted
the machine, you can use
to let elogind know that openrc will be the controller
in charge.

However, if you set the controller at configure time to something
different than what is in place, elogind will not start until that
controller is actively used as the primary controller.

ABI compatibility with libsystemd

Basically all symbols are included. But any API calls that require to
call systemd, or need internal knowledge of systemd, are simple stubs.
They are there to provide ABI compatibility, but will not work.

One exception is sd_is_mq() that is found in sd-daemon.h. This is the
only place using POSIX message queues, which would add further
dependencies. As those would be completely unused in the rest of
elogind, this function is also a stub, always returning 0.


LGPLv2.1+ for all code
- except src/basic/MurmurHash2.c which is Public Domain
- except src/basic/siphash24.c which is CC0 Public Domain


glibc >= 2.16
libmount >= 2.27.1 (from util-linux)
(util-linux < 2.29 *must* be built with --enable-libmount-force-mountinfo,
and later versions without --enable-libmount-support-mtab.)
libseccomp >= 2.3.1 (optional)
libblkid >= 2.24 (from util-linux) (optional)
PAM >= 1.1.2 (optional)
libacl (optional)
libselinux (optional)
libpython (optional)
gperf >= 3.1
docbook-xsl (optional, required for documentation)
xsltproc (optional, required for documentation)
python-lxml (optional, required to build the indices)
python, meson, ninja
gcc, awk, sed, grep, m4, and similar tools

During runtime, you need the following additional dependencies:

util-linux >= v2.27.1 required
dbus >= 1.9.14 (strictly speaking optional, but recommended)
NOTE: If using dbus < 1.9.18, you should override the default
policy directory (--with-dbuspolicydir=/etc/dbus-1/system.d).
PolicyKit (optional)

To build in directory build/:
meson build/ && ninja -C build

Any configuration options can be specified as -Darg=value... arguments
to meson. After the build directory is initially configured, the configuration
can be changed with:
meson configure -Darg=value... build/
'meson configure' without any arguments will print out available options and
their current values.

Useful commands:
ninja -v some/target
ninja test
sudo ninja install
DESTDIR=... ninja install

A tarball can be created with:
git archive --format=tar --prefix=elogind-238/ v238 | xz > elogind-238.tar.xz