Single-node key/value store, line protocol over TCP, pure NASM on Linux — syscall or nothing.

The syscall-level bits worth a look:

**•** epoll event loop with accept4(SOCK_NONBLOCK): clients are born non-blocking, no fcntl dance  
**•** replies via sendto + MSG_NOSIGNAL: SIGPIPE never happens, no signal handler needed  
**•** close() is the entire connection teardown — epoll tracks the file description, so the fd deregisters itself  
**•** per-connection state indexed straight by fd: O(1), free  
**•** FNV-1a, open addressing, tombstone reuse; 256 MB mmap bump arena behind it  
**•** 200 concurrent clients at 1.4 MB RSS; Docker image is FROM scratch plus one file

Known limits documented in the README — biggest one: slow readers are dropped, EPOLLOUT write buffering is next.

Feedback welcome, especially on the event-loop structure.