post registry + 9ns --mntgen: the /srv translation

2026-09-21T17:13:43Z

cloud9.post: servers post their socket under a name in $XDG_RUNTIME_DIR/9p (post/unpost, posted, dial, Watch) and serve.Runner.listenPosted posts a server by name, unposting on stop. Names are budget-checked against the 108-byte socket path; a claim binds+listens at a private temp path and takes the name with atomic renames under flock (RENAME_NOREPLACE for free names, RENAME_EXCHANGE grab-verify-commit for stale ones): the registry path is never unlinked by a claim, live names refuse with AlreadyPosted, foreign files with NotSocket, and unpost removes only the caller's inode-matched entry. Watch surfaces inotify overflow and a replaced registry dir. 9ns --mntgen [--mount DIR] -- PROGRAM: one FUSE mount at /mnt/9p whose synthetic root lists the posted registry (no connection made); a walk into an unmounted name dials it and runs the existing bridge dispatch in a per-server worker thread, routed by mount index in the node id's top bits (ordinals never reused, cap 4096); a dead server answers EIO on its subtree and is re-dialed on the next walk. The dial watches stop_fd through Tversion (connectWatched). All existing 9ns forms are unchanged. 9proc's unix listener no longer blind-unlinks its path: a foreign non-socket is refused (Occupied), a live server is refused (AlreadyListening), only a refused socket is cleared, and stop() unlinks only the listener's own inode-matched socket. Hardened by adversarial review (GLM 5.3 x2 + DeepSeek V4.1 Flash, all high-thinking): double-bind races on one name (0 in 180k rounds), foreign-file TOCTOU deletions (0 in 4M flips), a 255-byte-name listing panic, inotify queue overflow silently dropped, listenPosted silently overwriting, dial-time Tversion hangs wedging the dispatcher, --debug silently ignored in mntgen, and xattr/statx probes answering EPERM on the synthetic root (broke `ls -l /mnt/9p`). Tests: root 80/80, 9ns 47/47, 9proc 60/60, integration 88/88 + mntgen 37/37, adversarial 213/0, freestanding riscv32 gate green.

Rename programs: 9player -> 9ns, introspect -> 9proc, app -> web (9web)

2026-09-20T02:28:22Z

Directories, binaries, build options (-D9ns, -D9proc), step names, module name (9proc), thread and fs names, env var NINEPLAYER_MOUNT -> NINE_MOUNT, docs and test scripts. Browser assets move to web/static. Co-Authored-By: Claude Fable 5.1

cloud9.git/9ns/build.zig, branch main

post registry + 9ns --mntgen: the /srv translation

Rename programs: 9player -> 9ns, introspect -> 9proc, app -> web (9web)