Add TTY(RawFD) for non-STDIO tty's

Also add the necessary c functions to extract the FD/Handle from a pipe object. These aren't used anywhere, but will be helpful for #3823

base/stream.jl

@@ -169,6 +169,16 @@ type TTY <: AsyncStream
         false,Condition())
 end
 
+function TTY(fd::RawFD; readable::Bool = false)
+    handle = c_malloc(_sizeof_uv_tty)
+    uv_error("TTY",ccall(:uv_tty_init,Int32,(Ptr{Void},Ptr{Void},Int32,Int32),eventloop(),handle,fd.fd,readable) == -1)
+    ret = TTY(handle)
+    associate_julia_struct(handle,ret)
+    ret.status = StatusOpen
+    ret.line_buffered = false
+    ret
+end
+
 show(io::IO,stream::TTY) = print(io,"TTY(",uv_status_string(stream),", ",
     nb_available(stream.buffer)," bytes waiting)")
 

src/jl_uv.c

@@ -810,6 +810,23 @@ DLLEXPORT void *jl_uv_handle_data(uv_handle_t *handle)
     return handle->data;
 }
 
+#ifndef _OS_WINDOWS_
+#if defined(__APPLE__)
+int uv___stream_fd(uv_stream_t* handle);
+#define uv__stream_fd(handle) (uv___stream_fd((uv_stream_t*) (handle)))
+#else
+#define uv__stream_fd(handle) ((handle)->io_watcher.fd)
+#endif /* defined(__APPLE__) */
+DLLEXPORT int jl_uv_pipe_fd(uv_pipe_t *handle)
+{
+    return uv__stream_fd((uv_stream_t*)handle);
+}
+#else
+DLLEXPORT HANDLE jl_uv_pipe_handle(uv_pipe_t *handle)
+{
+    return uv_get_pipe_handle(handle);
+}
+#endif
 #ifdef __cplusplus
 }
 #endif