node: do not crash on IPC stdin

When started with IPC pipe on fd=0 child process should not crash when
referencing or using `process.stdin`.

fix joyent/node#8669

PR-URL: https://github.com/node-forward/node/pull/45
Reviewed-By: Ben Noorhduis <info@bnoordhuis.nl>

src/node.js

@@ -582,11 +582,24 @@
         case 'PIPE':
         case 'TCP':
           var net = NativeModule.require('net');
-          stdin = new net.Socket({
-            fd: fd,
-            readable: true,
-            writable: false
-          });
+
+          // It could be that process has been started with an IPC channel
+          // sitting on fd=0, in such case the pipe for this fd is already
+          // present and creating a new one will lead to the assertion failure
+          // in libuv.
+          if (process._channel && process._channel.fd === fd) {
+            stdin = new net.Socket({
+              handle: process._channel,
+              readable: true,
+              writable: false
+            });
+          } else {
+            stdin = new net.Socket({
+              fd: fd,
+              readable: true,
+              writable: false
+            });
+          }
           break;
 
         default:

test/simple/test-child-process-stdin-ipc.js

@@ -0,0 +1,44 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+
+var spawn = require('child_process').spawn;
+
+if (process.argv[2] === 'child') {
+  // Just reference stdin, it should start it
+  process.stdin;
+  return;
+}
+
+var proc = spawn(process.execPath, [__filename, 'child'], {
+  stdio: ['ipc', 'inherit', 'inherit']
+});
+
+var childCode = -1;
+proc.on('exit', function(code) {
+  childCode = code;
+});
+
+process.on('exit', function() {
+  assert.equal(childCode, 0);
+});