Extends Phase 0's chdir/errno/strerror with the syscalls that ffi/pty
needs to drive a forkpty'd child: waitpid (with WIFEXITED / WEXITSTATUS
/ WIFSIGNALED / WTERMSIG decoders), read, write, close, kill.
Status-word macros are reproduced from glibc bits/waitstatus.h using
the LuaJIT `bit` library. M.waitpid returns a structured (kind, value)
rather than the raw status word — callers don't have to know the
encoding:
"exit", N — normal exit, N is exit code
"signal", N — killed by signal N
"other", raw — stopped/continued (Phase 1 doesn't trace those)
nil, err — syscall failure
M.read / M.write / M.close / M.kill mirror their syscall return shape
with errno-string surfacing on failure. Read uses a shared 4 KiB
buffer for the common case; larger reads allocate a fresh buffer.
Smoke covers the chdir regression (still works), all four status
decoders against known status words, pipe round-trip for read/write/
close, EOF -> ("", 0), invalid-fd close -> false, kill(self, 0)
success, kill(bogus, 0) failure.
waitpid is not exercised by the smoke (needs a real child); that
arrives with ffi/pty.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Smallest Phase 0 module per CLAUDE.md §4 implementation order.
M.chdir(path) returns (true) or (false, errmsg) — errmsg via
strerror(__errno_location()[0]). Glibc errno is thread-local
behind __errno_location() rather than a plain global, hence the
indirect access.
Verified against PHASE0.md §7 expectation: a libc.chdir() persists
across subsequent io.popen() calls (popen's child inherits the
parent's wd), which is the property executor.lua relies on for `cd`
interception. Smoke:
libc.chdir("/tmp"); io.popen("pwd"):read("*l") --> /tmp
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- README, .gitignore, CLAUDE.md (project conventions)
- docs/PHASE0.md — full Phase 0 manifest (locked substrate)
- 10 root .lua modules + 4 ffi/ bindings, all stubs raising NotImplemented
with module-scoped responsibilities matching the manifest
- config.lua wired to current dirac/hossenfelder endpoints (qwen-coder-7b
snappy/32k + cloud via OpenRouter through hossenfelder)
File names match docs/PHASE0.md §4 exactly. Module bodies fill in across
later phases; the tree shape is locked.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
marfrit
claude-noether