bool

   ServerProcess::isAlreadyRunning()

   {

   #ifndef __linux__

      WarningLog(<<"can't check if process already running on this platform (not implemented yet)");

      return false;

   #else

      if(mPidFile.size() == )

      {

         // if no PID file specified, we do not make any check

         return false;

      }

      pid_t running_pid;

      std::ifstream _pid(mPidFile.c_str(), std::ios_base::in);

      if(!_pid.good())

      {

         // if the file doesn't exist or can't be opened, just ignore

         return false;

      }

      _pid >> running_pid;

      _pid.close();

      StackLog(<< mPidFile << " contains PID " << running_pid);

      Data ourProc = Data("/proc/self/exe");

      Data otherProc = Data("/proc/") + Data(running_pid) + Data("/exe");

      char our_exe[], other_exe[];

      int buf_size;

      buf_size = readlink(ourProc.c_str(), our_exe, );

      if(buf_size <  || buf_size == )

      {

         // if readlink fails, just ignore

         return false;

      }

      our_exe[buf_size] = ;

      buf_size = readlink(otherProc.c_str(), other_exe, );

      if(buf_size <  || buf_size == )

      {

         // if readlink fails, just ignore

         return false;

      }

      other_exe[buf_size] = ;

      if(strcmp(our_exe, other_exe) == )

      {

         ErrLog(<<"already running PID: " << running_pid);

         return true;

      }

      return false;

   #endif

   }