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src: ensure that fd 0-2 are valid on windows #11863

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src: ensure that fd 0-2 are valid on windows #11863

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15d4f8c
src: ensure that fd 0-2 are valid on windows
bzoz Mar 14, 2017
a73e803
fixup: cast in cpp, works on win2008, python things
bzoz Mar 16, 2017
db01a43
fixup: more changes
bzoz Mar 16, 2017
5d563cf
fixup: add comment about _close
bzoz Mar 20, 2017
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11 changes: 11 additions & 0 deletions src/node.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -4213,6 +4213,17 @@ inline void PlatformInit() {
} while (min + 1 < max);
}
#endif // __POSIX__
#ifdef _WIN32
for (int fd = 0; fd <= 2; ++fd) {
auto handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
if (handle == INVALID_HANDLE_VALUE ||
GetFileType(handle) == FILE_TYPE_UNKNOWN) {
_close(fd);
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_close() can't fail?

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It fails on Windows 2008 and 2012 but succeeds on Windows 10. IMHO the cleanest way is to just assert that _open returned proper fd.

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Is it known why it can fail on 2008/2012 and can that be worked around at all? I'm good with this as is but I'm curious :-)

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Win2008 and 2012 fail with errno EBADF. Win 10 happily closes the handle. But regardless of that, _open works as expected on all Win versions.

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@bzoz actually, having this explanation as a comment in the source seems like a good idea to me?

if (fd != _open("nul", _O_RDWR))
ABORT();
}
}
#endif // _WIN32
}


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8 changes: 8 additions & 0 deletions test/fixtures/spawn_closed_stdio.py
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@@ -0,0 +1,8 @@
import os
import sys
import subprocess
os.close(0)
os.close(1)
os.close(2)
exit_code = subprocess.call(sys.argv[1:], shell=False)
sys.exit(exit_code)
14 changes: 13 additions & 1 deletion test/parallel/test-stdio-closed.js
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Expand Up @@ -3,9 +3,21 @@ const common = require('../common');
const assert = require('assert');
const spawn = require('child_process').spawn;
const fs = require('fs');
const path = require('path');

if (common.isWindows) {
common.skip('platform not supported.');
if (process.argv[2] === 'child') {
process.stdin;
process.stdout;
process.stderr;
return;
}
const python = process.env.PYTHON || 'python';
const script = path.join(common.fixturesDir, 'spawn_closed_stdio.py');
const proc = spawn(python, [script, process.execPath, __filename, 'child']);
proc.on('exit', common.mustCall(function(exitCode) {
assert.strictEqual(exitCode, 0);
}));
return;
}

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