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

Check that stdin, stdout and stderr are valid file descriptors on
Windows. If not, reopen them with 'nul' file.

Refs: https://github.com/nodejs/node/pull/875
Fixes: https://github.com/nodejs/node/issues/11656
PR-URL: https://github.com/nodejs/node/pull/11863
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

src/node.cc

@@ -3995,6 +3995,19 @@ 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) {
+      // Ignore _close result. If it fails or not depends on used Windows
+      // version. We will just check _open result.
+      _close(fd);
+      if (fd != _open("nul", _O_RDWR))
+        ABORT();
+    }
+  }
+#endif  // _WIN32
 }
 
 

test/fixtures/spawn_closed_stdio.py

@@ -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)

test/parallel/test-stdio-closed.js

@@ -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;
 }