Mark pipe as close-on-exec.

runtime/bin/process_macos.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_MACOS)
 
 #include "bin/process.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 704 matching lines @@
     if (kSignals[i] == signal) {
       found = true;
       break;
     }
   }
   if (!found) return -1;
   int fds[2];
   if (NO_RETRY_EXPECTED(pipe(fds)) != 0) {
     return -1;
   }
-  if (!FDUtils::SetNonBlocking(fds[0])) {
+  if (!FDUtils::SetCloseOnExec(fds[0]) ||
+      !FDUtils::SetCloseOnExec(fds[1]) ||
+      !FDUtils::SetNonBlocking(fds[0])) {
     VOID_TEMP_FAILURE_RETRY(close(fds[0]));
     VOID_TEMP_FAILURE_RETRY(close(fds[1]));
     return -1;
   }
   ThreadSignalBlocker blocker(kSignalsCount, kSignals);
   MutexLocker lock(signal_mutex);
   SignalInfo* handler = signal_handlers;
   bool listen = true;
   while (handler != NULL) {
     if (handler->signal() == signal) {
@@ skipping 53 matching lines @@
     bzero(&act, sizeof(act));
     act.sa_handler = SIG_DFL;
     VOID_NO_RETRY_EXPECTED(sigaction(signal, &act, NULL));
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)