Time
Concept
Clocks on Peios
The clocks Peios exposes to userspace — what each measures, how to read them, and the side-channel-precision policy that gates fine-grained timer access.
ConceptSetting Time
How wall-clock time, monotonic frequency, leap seconds, and NTP discipline are altered on Peios — the SeSystemtimePrivilege gate, the threat model, and why clock-setting authority is held narrowly.
ConceptPOSIX Timers
Per-process scheduled timers — create, arm, query, delete. Notification via signal or thread, integration with the real-time signal model.
Concepttimerfd and Interval Timers
File-descriptor-shaped timers that integrate with epoll, and the legacy interval-timer interface (setitimer, alarm).
referenceHardware Clocks, NTP, and PTP
Hardware clock sources, the kernel NTP discipline state machine, the RTC device, leap-second handling, and Precision Time Protocol support.