stdout and stderr are blocking when referring to regular files

Fixes message tests.

Author: ry

doc/api/process.markdown

@@ -80,10 +80,20 @@ Example: the definition of `console.log`
       process.stdout.write(d + '\n');
     };
 
+`process.stderr` and `process.stdout` are unlike other streams in Node in
+that writes to them are usually blocking.  They are blocking in the case
+that they refer to regular files or TTY file descriptors. In the case they
+refer to pipes, they are non-blocking like other streams.
+
 
 ### process.stderr
 
-A writable stream to stderr. Writes on this stream are blocking.
+A writable stream to stderr.
+
+`process.stderr` and `process.stdout` are unlike other streams in Node in
+that writes to them are usually blocking.  They are blocking in the case
+that they refer to regular files or TTY file descriptors. In the case they
+refer to pipes, they are non-blocking like other streams.
 
 
 ### process.stdin

lib/fs.js

@@ -1337,3 +1337,64 @@ WriteStream.prototype.destroy = function(cb) {
 // There is no shutdown() for files.
 WriteStream.prototype.destroySoon = WriteStream.prototype.end;
 
+
+// SyncWriteStream is internal. DO NOT USE.
+// Temporary hack for process.stdout and process.stderr when piped to files.
+function SyncWriteStream(fd) {
+  this.fd = fd;
+  this.writable = true;
+  this.readable = false;
+};
+util.inherits(SyncWriteStream, Stream);
+
+
+// Export
+fs.SyncWriteStream = SyncWriteStream;
+
+
+SyncWriteStream.prototype.write = function(data, arg1, arg2) {
+  var encoding, cb;
+
+  // parse arguments
+  if (arg1) {
+    if (typeof arg1 === 'string') {
+      encoding = arg1;
+      cb = arg2;
+    } else if (typeof arg1 === 'function') {
+      cb = arg1;
+    } else {
+      throw new Error("bad arg");
+    }
+  }
+
+  // Change strings to buffers. SLOW
+  if (typeof data == 'string') {
+    data = new Buffer(data, encoding);
+  }
+
+  fs.writeSync(this.fd, data, 0, data.length);
+
+  if (cb) {
+    process.nextTick(cb);
+  }
+
+  return true;
+};
+
+
+SyncWriteStream.prototype.end = function(data, arg1, arg2) {
+  if (data) {
+    this.write(data, arg1, arg2);
+  }
+  this.destroy();
+};
+
+
+SyncWriteStream.prototype.destroy = function() {
+  fs.closeSync(this.fd);
+  this.fd = null;
+  this.emit('close');
+  return true;
+};
+
+SyncWriteStream.prototype.destroySoon = SyncWriteStream.prototype.destroy;

src/node.js

@@ -239,7 +239,7 @@
 
       case 'FILE':
         var fs = NativeModule.require('fs');
-        stream = new fs.WriteStream(null, { fd: fd });
+        stream = new fs.SyncWriteStream(fd);
         stream._type = 'fs';
         break;