jpmschweitzerandClaude Fable 5
7b395c5a0a
The probe spawns a hand-built /tmp/checkfd binary that exists only on machines where the T-438-era investigation ran; everywhere else it failed the whole harness with a ProcessException. Absence is now an explicit skip line, and the helper path is a named constant in both the io and web-stub variants. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
34 lines
1.2 KiB
Dart
34 lines
1.2 KiB
Dart
/// FFI fd-inheritance probe for the testmode harness (T-438 web fence, D-100).
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///
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/// Desktop-only — [test_app.dart] selects [fd_check_stub.dart] on web so the
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/// `dart:ffi` / `package:ffi` / libc imports stay out of the wasm graph.
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library;
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import 'dart:convert';
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import 'dart:ffi' as ffi;
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import 'dart:io';
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import 'package:ffi/ffi.dart' as pkg_ffi;
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import 'src/pty/ffi/libc.dart' as libc;
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/// The hand-built helper binary the probe spawns. Not part of the repo — the
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/// harness skips this probe when it is absent.
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const fdCheckHelperPath = '/tmp/checkfd';
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/// Probe whether `Process.start` inherits socket fds (the macOS question the
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/// testmode harness answers). Returns a human-readable result line.
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Future<String> fdInheritanceCheck() async {
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final sv = pkg_ffi.calloc<ffi.Int32>(2);
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libc.socketpair(1, 1, 0, sv); // AF_UNIX, SOCK_STREAM
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final parent = sv[0];
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final child = sv[1];
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pkg_ffi.calloc.free(sv);
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final proc = await Process.start(fdCheckHelperPath, [], environment: {...Platform.environment, 'PTYC_SOCK_FD': '$child'});
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final stderr = await proc.stderr.transform(utf8.decoder).join();
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final exit = await proc.exitCode;
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libc.close(parent);
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libc.close(child);
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return 'exit=$exit stderr=${stderr.trim()}';
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}
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