systemd-logind.service, systemd-logind — Login manager
systemd-logind is a system
service that manages user logins. It is responsible
Keeping track of users and sessions, their processes and their idle state
Creating control groups for user processes
Providing PolicyKit-based access for users to 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 management
User sessions are registered in logind via the pam_systemd(8) PAM module.
See logind.conf(5) for information about the configuration of this service.
See Multi-Seat on Linux for an introduction into basic concepts of logind such as users, sessions and seats.
logind D-Bus API Documentation for information about
For more information on the inhibition logic see the Inhibitor Lock Developer Documentation.