Linux sandbox: add test to ensure that pread64 can be forwarded.

sandbox/linux/tests/scoped_temporary_file_unittest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.

[jln (very slow on Chromium), 2014/06/26 02:21:21]

This file is new.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sandbox/linux/tests/scoped_temporary_file.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "base/files/scoped_file.h"
+#include "base/logging.h"
+#include "base/posix/eintr_wrapper.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace sandbox {
+
+namespace {
+
+bool FullWrite(int fd, const char* buffer, size_t count) {
+  while (count > 0) {
+    const ssize_t transfered = HANDLE_EINTR(write(fd, buffer, count));
+    if (transfered <= 0 || static_cast<size_t>(transfered) > count) {
+      return false;
+    }
+    count -= transfered;
+    buffer += transfered;
+  }
+  return true;
+}
+
+bool FullRead(int fd, char* buffer, size_t count) {
+  while (count > 0) {
+    const ssize_t transfered  = HANDLE_EINTR(read(fd, buffer, count));
+    if (transfered <= 0 || static_cast<size_t>(transfered) > count) {
+      return false;
+    }
+    count -= transfered;
+    buffer += transfered;
+  }
+  return true;
+}
+
+TEST(ScopedTemporaryFile, Basics) {
+  std::string temp_file_name;
+  {
+    ScopedTemporaryFile temp_file_1;
+    const char kTestString[] = "This is a test";
+    ASSERT_LE(0, temp_file_1.fd());
+
+    temp_file_name = temp_file_1.full_file_name();
+    base::ScopedFD temp_file_2(open(temp_file_1.full_file_name(), O_RDONLY));
+    ASSERT_TRUE(temp_file_2.is_valid());
+
+    ASSERT_TRUE(FullWrite(temp_file_1.fd(), kTestString, sizeof(kTestString)));
+
+    char test_string_read[sizeof(kTestString)] = {0};
+    ASSERT_TRUE(FullRead(
+        temp_file_2.get(), test_string_read, sizeof(test_string_read)));
+    ASSERT_EQ(0, memcmp(kTestString, test_string_read, sizeof(kTestString)));
+  }
+
+  errno = 0;
+  struct stat buf;
+  ASSERT_EQ(-1, stat(temp_file_name.c_str(), &buf));
+  ASSERT_EQ(ENOENT, errno);
+}
+
+}  // namespace
+
+}  // namespace sandbox