Always wait for child processes when forked, even if the process failed.

runtime/bin/process_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "bin/process.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 387 matching lines @@
     if (program_environment != NULL) {
       environ = program_environment;
     }
 
     TEMP_FAILURE_RETRY(
         execvp(path, const_cast<char* const*>(program_arguments)));
 
     ReportChildError(exec_control[1]);
   }
 
+  // Be sure to listen for exit-codes, now we have a child-process.
+  ExitCodeHandler::ProcessStarted();
+
   // The arguments and environment for the spawned process are not needed
   // any longer.
   delete[] program_arguments;
   delete[] program_environment;
 
   int event_fds[2];
   result = TEMP_FAILURE_RETRY(pipe(event_fds));
   if (result < 0) {
     SetChildOsErrorMessage(os_error_message);
     TEMP_FAILURE_RETRY(close(read_in[0]));
@@ skipping 66 matching lines @@
   FDUtils::SetNonBlocking(read_in[0]);
   *in = read_in[0];
   TEMP_FAILURE_RETRY(close(read_in[1]));
   FDUtils::SetNonBlocking(write_out[1]);
   *out = write_out[1];
   TEMP_FAILURE_RETRY(close(write_out[0]));
   FDUtils::SetNonBlocking(read_err[0]);
   *err = read_err[0];
   TEMP_FAILURE_RETRY(close(read_err[1]));
 
-  // Be sure to listen for exit-codes, now we have a child-process.
-  ExitCodeHandler::ProcessStarted();
-
   *id = pid;
   return 0;
 }
 
 
 class BufferList: public BufferListBase {
  public:
   bool Read(int fd, intptr_t available) {
     // Read all available bytes.
     while (available > 0) {
@@ skipping 120 matching lines @@
 
 
 intptr_t Process::CurrentProcessId() {
   return static_cast<intptr_t>(getpid());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)