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dependabot/npm_and_yarn/ip-address-10.2.0
windows95/docs/v86-patches.md
Felix Rieseberg b74e6c7b0a Fix guest TCP recv() stalling when v86 NE2000 TX ring wraps (#363) 
* Fix guest TCP recv() stalling under concurrent traffic

v86's fake_network stores TCPConnection routing fields (hsrc/hdest/
psrc/pdest) as zero-copy subarrays of the SYN frame, which is itself a
view into the NE2000 TX ring. Win95's driver uses a 12-slot ring; once
it wraps (any concurrent SMB/NBNS/ping while waiting for an upstream
reply), pump() emits segments with whatever IP now occupies that slot,
the guest RSTs them, and recv() blocks forever.

- libv86.js: copy the four address arrays at TCPConnection construction
  (matches felixrieseberg/v86@dd13099c on fake-network-copy-tcp-addrs,
  now merged into windows95-base)
- tools/probe-tcp.sh + net/tcp-trace.ts + tcp-relay.ts test stub +
  debug-harness WIN95_PROBE_RUN2: end-to-end regression harness
  (boot → ping -t → telnet → async write after ring wrap → assert ACK).
  All env-gated, no production-path change.
- docs/v86-patches.md: tracker for all fork patches + upstream PR state
- update-v86 SKILL.md: cross-link and new fork-branch entry

* Drop checked-in upstream PR description

Belongs on the GitHub PR, not in the repo.
2026-04-12 08:03:03 -07:00

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v86 patches carried by windows95

windows95 builds v86 from a fork branch rather than upstream master. Each fix lives on its own feature branch in felixrieseberg/v86, has an upstream PR against copy/v86, and is merged into the integration branch felixrieseberg/v86:windows95-base (which is what tools/update-v86.js builds from). When a PR is merged upstream, drop its row here, delete the feature branch, and rebase windows95-base.

Fix Branch Upstream PR windows95-base Why we need it
Node fs loader in Electron renderer electron-renderer-fs-loader copy/v86#1540 ✅ await import("node:fs/promises") fails in an Electron renderer; disk images don't load.
IDE shared Command Block registers ide-shared-registers copy/v86#1541 ✅ Win9x hangs at splash on disks >535 MiB because per-device register writes violate the ATA shared-register-file spec.
VMware absolute-pointer backdoor vmware-abspointer copy/v86#1542 ✅ Port 0x5658 GETVERSION + ABSPOINTER_* so VBMOUSE can track the host cursor 1:1 without pointer lock.
VMware text-clipboard backdoor vmware-clipboard — (stacked on #1542) ✅ Legacy backdoor commands 6–9 so W95TOOLS.EXE can sync CF_TEXT with the host.
Defer V86-mode VBE disable vga-defer-vbe-disable-v86 copy/v86#1543 ✅ Opening a windowed DOS box leaks vgabios's VBE-disable past Win9x's VDD and turns the screen to planar garbage.
fake_network: copy TCP addrs fake-network-copy-tcp-addrs — ✅ TCPConnection routing fields alias the NE2000 TX ring; concurrent guest traffic retargets async replies and the guest RSTs them.

Adding a fix

  1. Branch off origin/master in ../v86, commit, push to fork.
  2. Open the PR against copy/v86.
  3. git checkout windows95-base && git merge --no-ff <branch> && git push fork windows95-base
  4. node tools/update-v86.js in this repo to rebuild libv86.js / v86.wasm.
  5. Add a row above and a bullet in .claude/skills/update-v86/SKILL.md.