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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.
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as Tflush
- --name NAME (default derived from the transport: socket basename, tcp-IP-PORT,
spawned command, fdN) mounts at /mnt/9p/<name>; --mount still overrides.
ensureMountpoint walks down and creates missing components, shadowing the
deepest unwritable ancestor. NINE_MOUNT is the only exported variable.
- The inode number reported to the kernel is the 9P qid.path for every node,
root included; a server handing qid.path 1 to a file (Pardes /self) no
longer collides with the root.
- FUSE_INTERRUPT for the request in flight becomes Tflush; a blocked read
returns EINTR when the server answers the flush, chunked transfers return
short counts, other requests arriving meanwhile are stashed and served
next. Servers ignoring Tflush still block until they answer.
- 9ns-test now covers nine/bridge/fuse; new adv_bridge_interrupt suite (28);
9ns-itest grows to 88 checks.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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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 <[email protected]>
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