win: Use signed int as the integer representation of HANDLEs

test/win/win_child_process.cc

 // Copyright 2015 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,
@@ skipping 132 matching lines @@
 
 WinChildProcess::WinChildProcess() {
   std::string switch_value;
   CHECK(GetSwitch(kIsMultiprocessChild, &switch_value));
 
   // Set up the handles we inherited from the parent. These are inherited from
   // the parent and so are open and have the same value as in the parent. The
   // values are passed to the child on the command line.
   std::string left, right;
   CHECK(SplitString(switch_value, '|', &left, &right));
+
+  // left and right were formatted as 0x%x, so they need to be converted as
+  // unsigned ints.
   unsigned int write, read;
   CHECK(StringToNumber(left, &write));
   CHECK(StringToNumber(right, &read));
+
   pipe_write_.reset(IntToHandle(write));
   pipe_read_.reset(IntToHandle(read));
 
   // Notify the parent that it's OK to proceed. We only need to wait to get to
   // the process entry point, but this is the easiest place we can notify.
   char c = ' ';
   CheckedWriteFile(WritePipeHandle(), &c, sizeof(c));
 }
 
 // static
@@ skipping 64 matching lines @@
 void WinChildProcess::CloseReadPipe() {
   pipe_read_.reset();
 }
 
 void WinChildProcess::CloseWritePipe() {
   pipe_write_.reset();
 }
 
 }  // namespace test
 }  // namespace crashpad