stream: retry write on EPROTOTYPE on OS X

At least on OS X 10.10 "Yosemite", an EPROTOTYPE can occur
when trying to write to a socket that is shutting down.
By retrying the write after EPROTOTYPE, we correctly get EPIPE.

src/unix/stream.c

@@ -809,7 +809,17 @@ static void uv__write(uv_stream_t* stream) {
     do {
       n = sendmsg(uv__stream_fd(stream), &msg, 0);
     }
+#if defined(__APPLE__)
+    /*
+     * Due to a possible kernel bug at least in OS X 10.10 "Yosemite",
+     * EPROTOTYPE can be returned while trying to write to a socket that is
+     * shutting down. If we retry the write, we should get the expected EPIPE
+     * instead.
+     */
+    while (n == -1 && (errno == EINTR || errno == EPROTOTYPE));
+#else
     while (n == -1 && errno == EINTR);
+#endif
   } else {
     do {
       if (iovcnt == 1) {
@@ -818,7 +828,17 @@ static void uv__write(uv_stream_t* stream) {
         n = writev(uv__stream_fd(stream), iov, iovcnt);
       }
     }
+#if defined(__APPLE__)
+    /*
+     * Due to a possible kernel bug at least in OS X 10.10 "Yosemite",
+     * EPROTOTYPE can be returned while trying to write to a socket that is
+     * shutting down. If we retry the write, we should get the expected EPIPE
+     * instead.
+     */
+    while (n == -1 && (errno == EINTR || errno == EPROTOTYPE));
+#else
     while (n == -1 && errno == EINTR);
+#endif
   }
 
   if (n < 0) {