Add a "native_support" service.

services/native_support/process_impl_unittest.cc

+// Copyright 2015 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 <string.h>
+
+#include <memory>
+#include <vector>
+
+#include "base/message_loop/message_loop.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/public/cpp/bindings/type_converter.h"
+#include "mojo/public/cpp/system/macros.h"
+#include "mojo/services/files/public/cpp/output_stream_file.h"
+#include "mojo/services/files/public/interfaces/file.mojom.h"
+#include "mojo/services/files/public/interfaces/types.mojom.h"
+#include "services/native_support/process_test_base.h"
+
+namespace native_support {
+namespace {
+
+using ProcessImplTest = ProcessTestBase;
+
+// This also (slightly) tests |Wait()|, since we want to have some evidence that
+// we ran the specified binary (/bin/true versus /bin/false).
+TEST_F(ProcessImplTest, Spawn) {
+  mojo::files::Error error;
+
+  {
+    ProcessControllerPtr process_controller;
+    error = mojo::files::ERROR_INTERNAL;
+    process()->Spawn("/bin/true", mojo::Array<mojo::String>(),
+                     mojo::Array<mojo::String>(), nullptr, nullptr, nullptr,
+                     GetProxy(&process_controller), Capture(&error));
+    ASSERT_TRUE(process().WaitForIncomingResponse());
+    EXPECT_EQ(mojo::files::ERROR_OK, error);
+
+    error = mojo::files::ERROR_INTERNAL;
+    int32_t exit_status = 42;
+    process_controller->Wait(Capture(&error, &exit_status));
+    ASSERT_TRUE(process_controller.WaitForIncomingResponse());
+    EXPECT_EQ(mojo::files::ERROR_OK, error);
+    EXPECT_EQ(0, exit_status);
+  }
+
+  {
+    ProcessControllerPtr process_controller;
+    error = mojo::files::ERROR_INTERNAL;
+    process()->Spawn("/bin/false", mojo::Array<mojo::String>(),
+                     mojo::Array<mojo::String>(), nullptr, nullptr, nullptr,
+                     GetProxy(&process_controller), Capture(&error));
+    ASSERT_TRUE(process().WaitForIncomingResponse());
+    EXPECT_EQ(mojo::files::ERROR_OK, error);
+
+    error = mojo::files::ERROR_INTERNAL;
+    int32_t exit_status = 0;
+    process_controller->Wait(Capture(&error, &exit_status));
+    ASSERT_TRUE(process_controller.WaitForIncomingResponse());
+    EXPECT_EQ(mojo::files::ERROR_OK, error);
+    EXPECT_NE(exit_status, 0);
+  }
+}
+
+void QuitMessageLoop() {
+  base::MessageLoop::current()->QuitWhenIdle();
+}
+
+void RunMessageLoop() {
+  base::MessageLoop::current()->Run();
+}
+
+class CaptureOutputFile : public files_impl::OutputStreamFile::Client {
+ public:
+  explicit CaptureOutputFile(mojo::InterfaceRequest<mojo::files::File> request)
+      : impl_(files_impl::OutputStreamFile::Create(this, request.Pass())) {}
+  ~CaptureOutputFile() override {}
+
+  const std::string& output() const { return output_; }
+  bool is_closed() const { return is_closed_; }
+
+ private:
+  // |files_impl::OutputStreamFile::Client|:
+  void OnDataReceived(const void* bytes, size_t num_bytes) override {
+    output_.append(static_cast<const char*>(bytes), num_bytes);
+    QuitMessageLoop();
+  }
+  void OnClosed() override {
+    is_closed_ = true;
+    QuitMessageLoop();
+  }
+
+  std::string output_;
+  bool is_closed_ = false;
+  std::unique_ptr<files_impl::OutputStreamFile> impl_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(CaptureOutputFile);
+};
+
+// Spawn a native binary and redirect its stdout to a Mojo "file" that captures
+// it.
+TEST_F(ProcessImplTest, SpawnRedirectStdout) {
+  static const char kOutput[] = "hello mojo!";
+
+  mojo::files::FilePtr file;
+  CaptureOutputFile file_impl(GetProxy(&file));
+
+  mojo::Array<mojo::String> argv;
+  argv.push_back("/bin/echo");
+  argv.push_back(kOutput);
+  ProcessControllerPtr process_controller;
+  mojo::files::Error error = mojo::files::ERROR_INTERNAL;
+  process()->Spawn("/bin/echo", argv.Pass(), mojo::Array<mojo::String>(),
+                   nullptr, file.Pass(), nullptr, GetProxy(&process_controller),
+                   Capture(&error));
+  ASSERT_TRUE(process().WaitForIncomingResponse());
+  EXPECT_EQ(mojo::files::ERROR_OK, error);
+
+  // Since |file|'s impl is on our thread, we have to spin our message loop.
+  RunMessageLoop();
+  // /bin/echo adds a newline (alas, POSIX /bin/echo doesn't specify "-n").
+  EXPECT_EQ(std::string(kOutput) + "\n", file_impl.output());
+
+  error = mojo::files::ERROR_INTERNAL;
+  int32_t exit_status = 0;
+  process_controller->Wait(Capture(&error, &exit_status));
+  ASSERT_TRUE(process_controller.WaitForIncomingResponse());
+  EXPECT_EQ(mojo::files::ERROR_OK, error);
+  EXPECT_EQ(0, exit_status);
+
+  // TODO(vtl): Currently, |file| won't be closed until the process controller
+  // is closed, even if the child has been waited on and all output read.
+  // Possibly this should be changed, but we currently can't since the I/O
+  // thread doesn't have facilities for informing us that an FD will never be
+  // readable.
+  EXPECT_FALSE(file_impl.is_closed());
+  process_controller.reset();
+  RunMessageLoop();
+  EXPECT_TRUE(file_impl.is_closed());
+}
+
+}  // namespace
+}  // namespace native_support