Allow internal usage of SIGQUIT signal listening.

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 614 matching lines @@
 }
 
 
 intptr_t Process::CurrentProcessId() {
   return static_cast<intptr_t>(getpid());
 }
 
 
 static Mutex* signal_mutex = new Mutex();
 static SignalInfo* signal_handlers = NULL;
-static const int kSignalsCount = 6;
+static const int kSignalsCount = 7;
 static const int kSignals[kSignalsCount] = {
   SIGHUP,
   SIGINT,
   SIGTERM,
   SIGUSR1,
   SIGUSR2,
-  SIGWINCH
+  SIGWINCH,
+  SIGQUIT  // Allow VMService to listen on SIGQUIT.
 };
 
 
 SignalInfo::~SignalInfo() {
   VOID_TEMP_FAILURE_RETRY(close(fd_));
 }
 
 
 static void SignalHandler(int signal) {
   MutexLocker lock(signal_mutex);
@@ skipping 83 matching lines @@
     bzero(&act, sizeof(act));
     act.sa_handler = SIG_DFL;
     sigaction(signal, &act, NULL);
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)