Set close-on-exec flag on pipe() and kqueue() file descriptors on MacOS

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 "bin/process.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <poll.h>
 #include <signal.h>
@@ skipping 106 matching lines @@
     if (initialized_) {
       return true;
     }
 
     // Allocate a pipe that the signal handler can write a byte to and
     // that the exit handler thread can poll.
     int result = TEMP_FAILURE_RETRY(pipe(sig_chld_fds_));
     if (result < 0) {
       return false;
     }
+    FDUtils::SetCloseOnExec(sig_chld_fds_[0]);
+    FDUtils::SetCloseOnExec(sig_chld_fds_[1]);
 
     // Start thread that polls the pipe and handles process exits when
     // data is received on the pipe.
     result = dart::Thread::Start(ExitCodeHandlerEntry, sig_chld_fds_[0]);
     if (result != 0) {
       FATAL1("Failed to start exit code handler worker thread %d", result);
     }
 
     // Mark write end non-blocking.
     FDUtils::SetNonBlocking(sig_chld_fds_[1]);
@@ skipping 336 matching lines @@
     SetChildOsErrorMessage(os_error_message);
     TEMP_FAILURE_RETRY(close(read_in[0]));
     TEMP_FAILURE_RETRY(close(read_in[1]));
     TEMP_FAILURE_RETRY(close(read_err[0]));
     TEMP_FAILURE_RETRY(close(read_err[1]));
     TEMP_FAILURE_RETRY(close(write_out[0]));
     TEMP_FAILURE_RETRY(close(write_out[1]));
     Log::PrintErr("Error pipe creation failed: %s\n", *os_error_message);
     return errno;
   }
+  FDUtils::SetCloseOnExec(event_fds[0]);
+  FDUtils::SetCloseOnExec(event_fds[1]);
 
   ProcessInfoList::AddProcess(pid, event_fds[1]);
   *exit_event = event_fds[0];
   FDUtils::SetNonBlocking(event_fds[0]);
 
   // Notify child process to start.
   char msg = '1';
   result = FDUtils::WriteToBlocking(read_in[1], &msg, sizeof(msg));
   if (result != sizeof(msg)) {
     perror("Failed sending notification message");
@@ skipping 56 matching lines @@
 
 
 void Process::TerminateExitCodeHandler() {
   ExitCodeHandler::TerminateExitCodeThread();
 }
 
 
 intptr_t Process::CurrentProcessId() {
   return static_cast<intptr_t>(getpid());
 }