•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@.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 polkit-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
•Session switch management
•Device access management for users
•Automatic spawning of text logins (gettys) on virtual console activation and user runtime directory managementUser 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 the logind D-Bus API Documentation for information about the APIs systemd-logind provides. For more information on the inhibition logic see the Inhibitor Lock Developer Documentation. systemd(1), systemd-user-sessions.service(8), loginctl(1), logind.conf(5), pam_systemd(8) sd-login(3)
- logind D-Bus API Documentation
- Inhibitor Lock Developer Documentation