vfork.patch

diff --git a/src/unix/process.c b/src/unix/process.c
index c5a4592..59e1006 100644
--- a/src/unix/process.c
+++ b/src/unix/process.c
@@ -156,9 +156,14 @@ static int uv__process_init_pipe(uv_pipe_t* handle, int fds[2], int flags) {
     return uv__make_pipe(fds, flags);
 }
 
+#ifndef HAVE_VFORK
+# define HAVE_VFORK 1
+#endif
 
 #ifndef SPAWN_WAIT_EXEC
-# define SPAWN_WAIT_EXEC 1
+# if !HAVE_VFORK
+#  define SPAWN_WAIT_EXEC 1
+# endif
 #endif
 
 int uv_spawn(uv_loop_t* loop, uv_process_t* process,
@@ -224,7 +229,11 @@ int uv_spawn(uv_loop_t* loop, uv_process_t* process,
     goto error;
 #endif
 
+#if HAVE_VFORK
+  pid = vfork();
+#else
   pid = fork();
+#endif
 
   if (pid == -1) {
 #if SPAWN_WAIT_EXEC