diff --git a/lib/child_process.js b/lib/child_process.js
index d17329e3811..b5b44bc379b 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -28,6 +28,7 @@ var assert = require('assert');
 var util = require('util');
 var constants; // if (!constants) constants = process.binding('constants');
 
+var errnoException = util._errnoException;
 var handleWraps = {};
 
 function handleWrapGetter(name, callback) {
@@ -969,21 +970,6 @@ ChildProcess.prototype.spawn = function(options) {
 };
 
 
-function errnoException(errorno, syscall, errmsg) {
-  // TODO make this more compatible with ErrnoException from src/node.cc
-  // Once all of Node is using this function the ErrnoException from
-  // src/node.cc should be removed.
-  var message = syscall + ' ' + errorno;
-  if (errmsg) {
-    message += ' - ' + errmsg;
-  }
-  var e = new Error(message);
-  e.errno = e.code = errorno;
-  e.syscall = syscall;
-  return e;
-}
-
-
 ChildProcess.prototype.kill = function(sig) {
   var signal;
 
diff --git a/lib/dgram.js b/lib/dgram.js
index 7dd2086d7a8..570cbbe8dd6 100644
--- a/lib/dgram.js
+++ b/lib/dgram.js
@@ -34,6 +34,7 @@ var cluster = null;
 var dns = null;
 var net = null;
 
+var errnoException = util._errnoException;
 
 // no-op callback
 function noop() {
@@ -434,11 +435,3 @@ Socket.prototype.unref = function() {
   if (this._handle)
     this._handle.unref();
 };
-
-// TODO share with net_uv and others
-function errnoException(errorno, syscall) {
-  var e = new Error(syscall + ' ' + errorno);
-  e.errno = e.code = errorno;
-  e.syscall = syscall;
-  return e;
-}
diff --git a/lib/dns.js b/lib/dns.js
index e9611a3a71a..baac2b48d9f 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -19,27 +19,12 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-var cares = process.binding('cares_wrap'),
-    net = require('net'),
-    isIp = net.isIP;
+var cares = process.binding('cares_wrap');
+var net = require('net');
+var util = require('util');
 
-
-function errnoException(errorno, syscall) {
-  // TODO make this more compatible with ErrnoException from src/node.cc
-  // Once all of Node is using this function the ErrnoException from
-  // src/node.cc should be removed.
-
-  // For backwards compatibility. libuv returns ENOENT on NXDOMAIN.
-  if (errorno == 'ENOENT') {
-    errorno = 'ENOTFOUND';
-  }
-
-  var e = new Error(syscall + ' ' + errorno);
-
-  e.errno = e.code = errorno;
-  e.syscall = syscall;
-  return e;
-}
+var errnoException = util._errnoException;
+var isIp = net.isIP;
 
 
 // c-ares invokes a callback either synchronously or asynchronously,
diff --git a/lib/fs.js b/lib/fs.js
index b6cc49036f3..01a3c4d5e98 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -55,6 +55,8 @@ var O_WRONLY = constants.O_WRONLY || 0;
 var isWindows = process.platform === 'win32';
 
 var DEBUG = process.env.NODE_DEBUG && /fs/.test(process.env.NODE_DEBUG);
+var errnoException = util._errnoException;
+
 
 function rethrow() {
   // Only enable in debug mode. A backtrace uses ~1000 bytes of heap space and
@@ -334,12 +336,6 @@ function stringToFlags(flag) {
     return flag;
   }
 
-  // O_EXCL is mandated by POSIX, Windows supports it too.
-  // Let's add a check anyway, just in case.
-  if (!O_EXCL && ~flag.indexOf('x')) {
-    throw errnoException('ENOSYS', 'fs.open(O_EXCL)');
-  }
-
   switch (flag) {
     case 'r' : return O_RDONLY;
     case 'rs' : return O_RDONLY | O_SYNC;
@@ -999,17 +995,6 @@ fs.appendFileSync = function(path, data, options) {
   fs.writeFileSync(path, data, options);
 };
 
-function errnoException(errorno, syscall) {
-  // TODO make this more compatible with ErrnoException from src/node.cc
-  // Once all of Node is using this function the ErrnoException from
-  // src/node.cc should be removed.
-  var e = new Error(syscall + ' ' + errorno);
-  e.errno = e.code = errorno;
-  e.syscall = syscall;
-  return e;
-}
-
-
 function FSWatcher() {
   EventEmitter.call(this);
 
diff --git a/lib/net.js b/lib/net.js
index d30c002d49c..c970595b50a 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -25,7 +25,9 @@ var timers = require('timers');
 var util = require('util');
 var assert = require('assert');
 var cares = process.binding('cares_wrap');
+
 var cluster;
+var errnoException = util._errnoException;
 
 function noop() {}
 
@@ -940,19 +942,6 @@ function afterConnect(status, handle, req, readable, writable) {
 }
 
 
-function errnoException(errorno, syscall) {
-  // TODO make this more compatible with ErrnoException from src/node.cc
-  // Once all of Node is using this function the ErrnoException from
-  // src/node.cc should be removed.
-  var e = new Error(syscall + ' ' + errorno);
-  e.errno = e.code = errorno;
-  e.syscall = syscall;
-  return e;
-}
-
-
-
-
 function Server(/* [ options, ] listener */) {
   if (!(this instanceof Server)) return new Server(arguments[0], arguments[1]);
   events.EventEmitter.call(this);
diff --git a/lib/tty.js b/lib/tty.js
index 98d498a17c4..5d60ec6608c 100644
--- a/lib/tty.js
+++ b/lib/tty.js
@@ -26,6 +26,9 @@ var TTY = process.binding('tty_wrap').TTY;
 var isTTY = process.binding('tty_wrap').isTTY;
 var util = require('util');
 
+var errnoException = util._errnoException;
+
+
 exports.isatty = function(fd) {
   return isTTY(fd);
 };
@@ -123,12 +126,3 @@ WriteStream.prototype.clearScreenDown = function() {
 WriteStream.prototype.getWindowSize = function() {
   return [this.columns, this.rows];
 };
-
-
-// TODO share with net_uv and others
-function errnoException(errorno, syscall) {
-  var e = new Error(syscall + ' ' + errorno);
-  e.errno = e.code = errorno;
-  e.syscall = syscall;
-  return e;
-}
diff --git a/lib/util.js b/lib/util.js
index 4f9d06943e0..f02aa8f6a4d 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -601,3 +601,15 @@ exports.pump = exports.deprecate(function(readStream, writeStream, callback) {
     call(err);
   });
 }, 'util.pump(): Use readableStream.pipe() instead');
+
+
+var uv;
+exports._errnoException = function(err, syscall) {
+  if (typeof uv === 'undefined') uv = process.binding('uv');
+  var errname = uv.errname(err);
+  var e = new Error(syscall + ' ' + errname);
+  e.code = errname;
+  e.errno = errname;
+  e.syscall = syscall;
+  return e;
+};
diff --git a/src/node.js b/src/node.js
index 66c8cbbe54f..061cbf9c3c1 100644
--- a/src/node.js
+++ b/src/node.js
@@ -459,16 +459,6 @@
     if (process._print_eval) console.log(result);
   }
 
-  function errnoException(errorno, syscall) {
-    // TODO make this more compatible with ErrnoException from src/node.cc
-    // Once all of Node is using this function the ErrnoException from
-    // src/node.cc should be removed.
-    var e = new Error(syscall + ' ' + errorno);
-    e.errno = e.code = errorno;
-    e.syscall = syscall;
-    return e;
-  }
-
   function createWritableStdioStream(fd) {
     var stream;
     var tty_wrap = process.binding('tty_wrap');
@@ -651,6 +641,7 @@
       }
 
       if (r) {
+        var errnoException = NativeModule.require('util')._errnoException;
         throw errnoException(process._errno, 'kill');
       }
 
@@ -685,6 +676,7 @@
         var r = wrap.start(signum);
         if (r) {
           wrap.close();
+          var errnoException = NativeModule.require('util')._errnoException;
           throw errnoException(process._errno, 'uv_signal_start');
         }