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Neil
04ae62202a
The relay asset from #17920 only rewrote the forkpty `default:` call site, which sits in the `#else` arm of PtyFork's `#if defined(__APPLE__)`. macOS takes `pty_posix_spawn`, so the asset had never patched anything a Mac executes -- and `applyNodePtyMasterCloexecPatch` returned 'fixed' for any non-Linux host without running the script at all, which is what publishes a tree to the shared native-deps cache. Stock `pty_posix_spawn` opens up to three throwaway ptys to push the real master off fds 0-2 and never closes them: the cleanup loop is `for (; count > 0; count--)`, but the first `posix_openpt()` in a running process already returns >= 2, so it breaks with `count == 0` and the body never runs -- and where it does run it closes `low_fds[count]`, never `low_fds[0]`. One orphaned /dev/ptmx fd per terminal, for the life of the relay. Ports the `low_fds` fix and the Apple-branch `pty_cloexec(master)` call from the app's `config/patches/node-pty@1.1.0.patch`, byte-identical, and runs the gate on darwin. macOS needs a different build layout than Linux: it has no `build/` at all, so the fallback moved aside is `prebuilds/darwin-<arch>` -- which is also what makes node-pty's install script fall through from "prebuild found" to node-gyp -- and the compile writes a `build/Release` the loader checks first. Verification is per-platform too: Linux's leak is inheritance (/proc), macOS's is self-held (lsof). Also corrects the asset's claim that "macOS re-opens the tty through uv_tty_init's cloexec dup". Measured false: FD_CLOEXEC is not set on the master. What protects it is POSIX_SPAWN_CLOEXEC_DEFAULT, one option away from gone since uid/gid drops libuv back to fork()/exec() -- so the master is now marked there too. Measured on darwin-arm64, one PTY per open/close cycle in a relay-shaped dir running the relay's own commands: before cycle:ptmx 1:1 2:2 3:3 ... 10:10 (10 after a settle) after cycle:ptmx 1:0 2:0 3:0 ... 10:0 (0 after a settle) Linux re-verified in docker node:22: inherited before, isolated after, `already-patched` on the second run. Refs #17915 Refs #8362