src: update to latest libuv api

libuv gyp builds now require you to define the library disposition
(static or shared).

Also, libuv now supports vectored IO for file system reads and writes,
update to those function signatures

configure

@@ -560,6 +560,9 @@ def configure_libuv(o):
   # assume shared libuv if one of these is set?
   if options.shared_libuv_libpath:
     o['libraries'] += ['-L%s' % options.shared_libuv_libpath]
+  else:
+    o['variables']['uv_library'] = 'static_library'
+
   if options.shared_libuv_libname:
     o['libraries'] += ['-l%s' % options.shared_libuv_libname]
   elif options.shared_libuv:

src/node_file.cc

@@ -769,12 +769,14 @@ static void WriteBuffer(const FunctionCallbackInfo<Value>& args) {
 
   buf += off;
 
+  uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
+
   if (cb->IsFunction()) {
-    ASYNC_CALL(write, cb, fd, buf, len, pos)
+    ASYNC_CALL(write, cb, fd, &uvbuf, 1, pos)
     return;
   }
 
-  SYNC_CALL(write, NULL, fd, buf, len, pos)
+  SYNC_CALL(write, NULL, fd, &uvbuf, 1, pos)
   args.GetReturnValue().Set(SYNC_RESULT);
 }
 
@@ -818,8 +820,10 @@ static void WriteString(const FunctionCallbackInfo<Value>& args) {
   pos = GET_OFFSET(args[2]);
   cb = args[4];
 
+  uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
+
   if (!cb->IsFunction()) {
-    SYNC_CALL(write, NULL, fd, buf, len, pos)
+    SYNC_CALL(write, NULL, fd, &uvbuf, 1, pos)
     if (must_free)
       delete[] buf;
     return args.GetReturnValue().Set(SYNC_RESULT);
@@ -829,8 +833,8 @@ static void WriteString(const FunctionCallbackInfo<Value>& args) {
   int err = uv_fs_write(env->event_loop(),
                         &req_wrap->req_,
                         fd,
-                        buf,
+                        &uvbuf,
-                        len,
+                        1,
                         pos,
                         After);
   req_wrap->object()->Set(env->oncomplete_string(), cb);
@@ -896,12 +900,14 @@ static void Read(const FunctionCallbackInfo<Value>& args) {
 
   buf = buffer_data + off;
 
+  uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
+
   cb = args[5];
 
   if (cb->IsFunction()) {
-    ASYNC_CALL(read, cb, fd, buf, len, pos);
+    ASYNC_CALL(read, cb, fd, &uvbuf, 1, pos);
   } else {
-    SYNC_CALL(read, 0, fd, buf, len, pos)
+    SYNC_CALL(read, 0, fd, &uvbuf, 1, pos)
     args.GetReturnValue().Set(SYNC_RESULT);
   }
 }