Day48 - Epoll Timerfd Idle Timeout¶
Summary¶
Implemented idle timeout handling using timerfd integrated with epoll.
Key Learnings¶
timerfd¶
- fd-based timer mechanism
- integrates naturally with epoll
- read() returns expiration count
Timeout Design¶
- global timer + per-client timestamp
- periodic scanning approach
- simple and effective
Client Management¶
- maintain separate client list
- do not rely on epoll for tracking
- careful handling when deleting nodes during traversal
Debugging¶
Added debug logs:
Confirmed:
- timeout behavior is correct
- activity resets idle timer
- multi-client case works
Issues Encountered¶
- confusion between epoll events and client tracking
- handling list traversal with deletion
- understanding timerfd expiration semantics
Outcome¶
A fully working:
- epoll-based multi-client TCP server
- with TX queue
- and idle timeout management
This resembles a simplified production-grade server design.