MachMultiprocess test: the child process must wait for the parent to finish

util/test/multiprocess.h

 // 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,
@@ skipping 98 matching lines @@
   //! \brief Returns the child process’ process ID.
   //!
   //! This method may only be called by the parent process.
   pid_t ChildPID() const;
 
   //! \brief Returns the read pipe’s file descriptor.
   //!
   //! This method may be called by either the parent or the child process.
   //! Anything written to the write pipe in the partner process will appear
   //! on the this file descriptor in this process.
+  //!
+  //! It is an error to call this after CloseReadPipe() has been called.
+  //!
+  //! \return The read pipe’s file descriptor.
   int ReadPipeFD() const;
 
   //! \brief Returns the write pipe’s file descriptor.
   //!
   //! This method may be called by either the parent or the child process.
   //! Anything written to this file descriptor in this process will appear on
   //! the read pipe in the partner process.
+  //!
+  //! It is an error to call this after CloseWritePipe() has been called.
+  //!
+  //! \return The write pipe’s file descriptor.
   int WritePipeFD() const;
 
+  //! \brief Closes the read pipe.
+  //!
+  //! This method may be called by either the parent or the child process. An
+  //! attempt to write to the write pipe in the partner process will fail with
+  //! `EPIPE` or `SIGPIPE`. ReadPipeFD() must not be called after this.
+  void CloseReadPipe();
+
+  //! \brief Closes the write pipe.
+  //!
+  //! This method may be called by either the parent or the child process. An
+  //! attempt to read from the read pipe in the partner process will indicate
+  //! end-of-file. WritePipeFD() must not be called after this.
+  void CloseWritePipe();
+
  private:
   //! \brief Runs the parent side of the test.
   //!
   //! This method establishes the parent’s environment and calls
   //! MultiprocessParent().
   void RunParent();
 
   //! \brief Runs the child side of the test.
   //!
   //! This method establishes the child’s environment, calls
@@ skipping 25 matching lines @@
   int code_;
   TerminationReason reason_;
 
   DISALLOW_COPY_AND_ASSIGN(Multiprocess);
 };
 
 }  // namespace test
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_TEST_MULTIPROCESS_H_