unix: set non-block mode in uv_{pipe,tcp,udp}_open

The contract specifies that the file descriptor should already be in
non-blocking mode before passing it to libuv.

However, node users don't really have an opportunity to do so, never
mind the fact that the call to uv_pipe_open() or uv_tcp_open() is an
implementation detail that most users won't be aware of.

Let's be nice and set the non-blocking flag explicitly.  It's a cheap
operation anyway.

Fixes: libuv#124

PR: libuv#134
Reviewed-by: Saúl Ibarra Corretgé <saghul@gmail.com>

docs/src/pipe.rst

@@ -38,8 +38,7 @@ API
 
     Open an existing file descriptor or HANDLE as a pipe.
 
-    .. note::
-        The user is responsible for setting the file descriptor in non-blocking mode.
+    .. versionchanged:: 1.2.1 the file descriptor is set to non-blocking mode.
 
 .. c:function:: int uv_pipe_bind(uv_pipe_t* handle, const char* name)
 

docs/src/tcp.rst

@@ -36,9 +36,7 @@ API
 
     Open an existing file descriptor or SOCKET as a TCP handle.
 
-    .. note::
-        The user is responsible for setting the file descriptor in
-        non-blocking mode.
+    .. versionchanged:: 1.2.1 the file descriptor is set to non-blocking mode.
 
 .. c:function:: int uv_tcp_nodelay(uv_tcp_t* handle, int enable)
 

docs/src/udp.rst

@@ -120,6 +120,8 @@ API
     In other words, other datagram-type sockets like raw sockets or netlink
     sockets can also be passed to this function.
 
+    .. versionchanged:: 1.2.1 the file descriptor is set to non-blocking mode.
+
 .. c:function:: int uv_udp_bind(uv_udp_t* handle, const struct sockaddr* addr, unsigned int flags)
 
     Bind the UDP handle to an IP address and port.

src/unix/pipe.c

@@ -125,9 +125,13 @@ void uv__pipe_close(uv_pipe_t* handle) {
 
 
 int uv_pipe_open(uv_pipe_t* handle, uv_file fd) {
-#if defined(__APPLE__)
   int err;
 
+  err = uv__nonblock(fd, 1);
+  if (err)
+    return err;
+
+#if defined(__APPLE__)
   err = uv__stream_try_select((uv_stream_t*) handle, &fd);
   if (err)
     return err;

src/unix/tcp.c

@@ -156,6 +156,12 @@ int uv__tcp_connect(uv_connect_t* req,
 
 
 int uv_tcp_open(uv_tcp_t* handle, uv_os_sock_t sock) {
+  int err;
+
+  err = uv__nonblock(sock, 1);
+  if (err)
+    return err;
+
   return uv__stream_open((uv_stream_t*)handle,
                          sock,
                          UV_STREAM_READABLE | UV_STREAM_WRITABLE);

src/unix/udp.c

@@ -565,6 +565,10 @@ int uv_udp_open(uv_udp_t* handle, uv_os_sock_t sock) {
   if (handle->io_watcher.fd != -1)
     return -EALREADY;  /* FIXME(bnoordhuis) Should be -EBUSY. */
 
+  err = uv__nonblock(sock, 1);
+  if (err)
+    return err;
+
   err = uv__set_reuse(sock);
   if (err)
     return err;

test/test-close-fd.c

@@ -54,7 +54,6 @@ TEST_IMPL(close_fd) {
   int fd[2];
 
   ASSERT(0 == pipe(fd));
-  ASSERT(0 == fcntl(fd[0], F_SETFL, O_NONBLOCK));
   ASSERT(0 == uv_pipe_init(uv_default_loop(), &pipe_handle, 0));
   ASSERT(0 == uv_pipe_open(&pipe_handle, fd[0]));
   fd[0] = -1;  /* uv_pipe_open() takes ownership of the file descriptor. */

test/test-spawn.c

@@ -1243,7 +1243,6 @@ TEST_IMPL(closed_fd_events) {
 
   /* create a pipe and share it with a child process */
   ASSERT(0 == pipe(fd));
-  ASSERT(0 == fcntl(fd[0], F_SETFL, O_NONBLOCK));
 
   /* spawn_helper4 blocks indefinitely. */
   init_process_options("spawn_helper4", exit_cb);