Make M-x shell work in emacs.

build_tools/naclprocess.js

 /*
  * Copyright (c) 2014 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* jshint evil: true */
 /* globals PipeServer */
 
 'use strict';
@@ skipping 1138 matching lines @@
       return;
     }
 
     if (self.ttyWidth === null || self.ttyHeight === null) {
       console.log('tty size not set! Call onTerminalResize.');
       callback(-Errno.ENOEXEC);
       return;
     }
 
     var fg = document.createElement('object');
-    self.foregroundProcess = fg;
 
     var ppid;
     if (pid === -1) {
       // Create new process
       pid = self.pid;
       self.pid += 1;
       self.log("creating new process: " + pid);
 
       var pgid = parent ? self.processes[parent.pid].pgid : pid;
       ppid = parent ? parent.pid : NaClProcessManager.INIT_PID;
@@ skipping 126 matching lines @@
     // TODO(bradnelson): Consider dropping this method of passing in parameters.
     if (args.arg0 === undefined && args.arg1 === undefined && argv) {
       var argn = 0;
       argv.forEach(function (arg) {
         var argname = 'arg' + argn;
         addParam(argname, arg);
         argn = argn + 1;
       });
     }
 
-    self.pipeServer.addProcessPipes(fg.pid, params);
+    // Add in process pipes, and only make the foreground process if started
+    // by the current foreground process and not piped somewhere else.
+    var routesStdin = self.pipeServer.addProcessPipes(fg.pid, params);
+    if (!routesStdin &&
+        (self.foregroundProcess === null ||
+         self.foregroundProcess === parent)) {
+      self.foregroundProcess = fg;
+    }
 
     if (params[NaClProcessManager.ENV_SPAWN_MODE] ===
         NaClProcessManager.ENV_SPAWN_POPUP_VALUE) {
       var popup = new GraphicalPopup(
         fg,
         parseInt(params[NaClProcessManager.ENV_POPUP_WIDTH] ||
                  NaClProcessManager.POPUP_WIDTH_DEFAULT, 10),
         parseInt(params[NaClProcessManager.ENV_POPUP_HEIGHT] ||
                  NaClProcessManager.POPUP_HEIGHT_DEFAULT, 10),
         argv[0]
@@ skipping 167 matching lines @@
  */
 NaClProcessManager.prototype.sendStdinForeground = function (str) {
   if (!this.foregroundProcess) {
     throw new Error(NaClProcessManager.NO_FG_ERROR);
   }
 
   var message = {};
   message[NaClProcessManager.prefix] = str;
   this.foregroundProcess.postMessage(message);
 };