systemd-logind.service, systemd-logind - Login manager
systemd-logind.service
/lib/systemd/systemd-logind
systemd-logind is a system service that manages user logins. It is responsible for:
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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.
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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.
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Providing polkit[1]-based access for users for operations such as system shutdown or sleep
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Implementing a shutdown/sleep inhibition logic for applications
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Handling of power/sleep hardware keys
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Multi-seat management
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Session switch management
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Device access management for users
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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 Inhibitor Lock Developer Documentation[2].
If you are interested in writing a display manager that makes use of logind, please have look at Writing Display Managers[3]. If you are interested in writing a desktop environment that makes use of logind, please have look at Writing Desktop Environments[4].
systemd(1), systemd-user-sessions.service(8), loginctl(1), logind.conf(5), pam_systemd(8), sd-login(3)
polkit
Inhibitor Lock Developer Documentation
Writing Display Managers
https://www.freedesktop.org/wiki/Software/systemd/writing-display-managers
Writing Desktop Environments
https://www.freedesktop.org/wiki/Software/systemd/writing-desktop-environments