systemd的登陆程序为systemd-logind.service,配置文件/etc/systemd/logind.conf
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
? 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
? 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 in logind via the pam_systemd(8) PAM module.