systemd-logind(8)
systemd-logind.service, systemd-logind – Login manager
Synopsis
systemd-logind.service
/lib/systemd/systemd-logind
Description
systemd-logind is a system service that manages user logins. It is responsible for:
- • Keeping track of users and sessions, their processes and their idle state. This is implemented by allocating a systemd slice unit for each user below user.slice, and a scope unit below it for each concurrent session of a user. Also, a per-user service manager is started as system service instance of user [at] .service for each logged in user.
- • Generating and managing session IDs. If auditing is available and an audit session ID is already set for a session, then this ID is reused as the session ID. Otherwise, an independent session counter is used.
- • Providing m[blue]
polkitm[][1]-based access for users for operations such as system shutdown or sleep
- • Implementing a shutdown/sleep inhibition logic for applications
- • Handling of power/sleep hardware keys
- • Multi-seat management
- • Session switch management
- • Device access management for users
- • Automatic spawning of text logins (gettys) on virtual console activation and user runtime directory management
User sessions are registered with logind via the pam_systemd(8) PAM module.
See logind.conf(5) for information about the configuration of this service.
See sd-login(3) for information about the basic concepts of logind such as users, sessions and seats.
See org.freedesktop.login1(5) and org.freedesktop.LogControl1(5) for information about the D-Bus APIs systemd-logind provides.
For more information on the inhibition logic see the m[blue]Inhibitor Lock Developer Documentationm[][2].
If you are interested in writing a display manager that makes use of logind, please have look at m[blue]Writing Display Managersm[][3]. If you are interested in writing a desktop environment that makes use of logind, please have look at m[blue]Writing Desktop Environmentsm[][4].
See Also
systemd(1), systemd-user-sessions.service(8), loginctl(1), logind.conf(5), pam_systemd(8), sd-login(3)
Notes
- 1.
- polkit
- https://www.freedesktop.org/wiki/Software/polkit
- 2.
- Inhibitor Lock Developer Documentation
- https://www.freedesktop.org/wiki/Software/systemd/inhibit
- 3.
- Writing Display Managers
- https://www.freedesktop.org/wiki/Software/systemd/writing-display-managers
- 4.
- Writing Desktop Environments
- https://www.freedesktop.org/wiki/Software/systemd/writing-desktop-environments