Mojo EDK: Introduce MojoQueryHandleSignalsState API

mojo/edk/system/signals_unittest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/edk/test/mojo_test_base.h"
+#include "mojo/public/c/system/buffer.h"
+#include "mojo/public/c/system/data_pipe.h"
+#include "mojo/public/c/system/functions.h"
+#include "mojo/public/c/system/message_pipe.h"
+#include "mojo/public/c/system/types.h"
+
+namespace mojo {
+namespace edk {
+namespace {
+
+using SignalsTest = test::MojoTestBase;
+
+TEST_F(SignalsTest, QueryInvalidArguments) {
+  MojoHandleSignalsState state = {0, 0};
+  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
+            MojoQueryHandleSignalsState(MOJO_HANDLE_INVALID, &state));
+
+  MojoHandle a, b;
+  CreateMessagePipe(&a, &b);
+  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
+            MojoQueryHandleSignalsState(a, nullptr));
+}
+
+TEST_F(SignalsTest, QueryMessagePipeSignals) {
+  MojoHandleSignalsState state = {0, 0};
+
+  MojoHandle a, b;
+  CreateMessagePipe(&a, &b);
+
+  EXPECT_EQ(MOJO_RESULT_OK, MojoQueryHandleSignalsState(a, &state));
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, state.satisfied_signals);
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE |
+                MOJO_HANDLE_SIGNAL_PEER_CLOSED,
+            state.satisfiable_signals);
+
+  EXPECT_EQ(MOJO_RESULT_OK, MojoQueryHandleSignalsState(b, &state));
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, state.satisfied_signals);
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE |
+                MOJO_HANDLE_SIGNAL_PEER_CLOSED,
+            state.satisfiable_signals);
+
+  WriteMessage(a, "ok");
+  EXPECT_EQ(MOJO_RESULT_OK, WaitForSignals(b, MOJO_HANDLE_SIGNAL_READABLE));
+
+  EXPECT_EQ(MOJO_RESULT_OK, MojoQueryHandleSignalsState(b, &state));
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE,
+            state.satisfied_signals);
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE |
+                MOJO_HANDLE_SIGNAL_PEER_CLOSED,
+            state.satisfiable_signals);
+
+  EXPECT_EQ("ok", ReadMessage(b));
+
+  EXPECT_EQ(MOJO_RESULT_OK, MojoQueryHandleSignalsState(b, &state));
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, state.satisfied_signals);
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE |
+                MOJO_HANDLE_SIGNAL_PEER_CLOSED,
+            state.satisfiable_signals);
+
+  EXPECT_EQ(MOJO_RESULT_OK, MojoClose(a));
+
+  EXPECT_EQ(MOJO_RESULT_OK, WaitForSignals(b, MOJO_HANDLE_SIGNAL_PEER_CLOSED));
+
+  EXPECT_EQ(MOJO_RESULT_OK, MojoQueryHandleSignalsState(b, &state));
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_PEER_CLOSED, state.satisfied_signals);
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_PEER_CLOSED, state.satisfiable_signals);
+}
+
+}  // namespace
+}  // namespace edk
+}  // namespace mojo