Add and use CheckedReadFD(), CheckedWriteFD(), and CheckedReadFDAtEOF()

util/test/multiprocess_exec_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/test/multiprocess_exec.h"
 
 #include <unistd.h>
 
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 #include "util/file/fd_io.h"
-#include "util/test/errors.h"
 #include "util/test/executable_path.h"
 
 namespace {
 
 using namespace crashpad;
 using namespace crashpad::test;
 
 class TestMultiprocessExec final : public MultiprocessExec {
  public:
   TestMultiprocessExec() : MultiprocessExec() {}
 
   ~TestMultiprocessExec() {}
 
  private:
   virtual void MultiprocessParent() override {
-    int write_fd = WritePipeFD();
     char c = 'z';
-    ssize_t rv = WriteFD(write_fd, &c, 1);
-    ASSERT_EQ(1, rv) << ErrnoMessage("write");
+    CheckedWriteFD(WritePipeFD(), &c, 1);
 
-    int read_fd = ReadPipeFD();
-    rv = ReadFD(read_fd, &c, 1);
-    ASSERT_EQ(1, rv) << ErrnoMessage("read");
+    CheckedReadFD(ReadPipeFD(), &c, 1);
     EXPECT_EQ('Z', c);
   }
 
   DISALLOW_COPY_AND_ASSIGN(TestMultiprocessExec);
 };
 
 TEST(MultiprocessExec, MultiprocessExec) {
   TestMultiprocessExec multiprocess_exec;
   base::FilePath test_executable = ExecutablePath();
   std::string child_test_executable =
       test_executable.value() + "_multiprocess_exec_test_child";
   multiprocess_exec.SetChildCommand(child_test_executable, NULL);
   multiprocess_exec.Run();
 }
 
 }  // namespace