$cmd="myCommand";
    # Timeout evaluation:
    eval {
      # Set action to be done when alarm occurs:
      local $SIG{ALRM} = sub { die "ALARM_COMMAND_TIMEOUT" };
      # Schedule alarm in $CMD_TIMEOUT seconds:
      alarm($CMD_TIMEOUT);

      ### execute the command that can block
      $Results = `$cmd`;
      if ($?) {# optional error handling}
      }
      wait;
      alarm(0);

      close(PIPE);
    };
    alarm(0);


##</code><code>##

perl -le'$SIG{ALRM}=sub {die "TIMEOUT"};
     eval{alarm 10;
          open PIPE, "while [ 1 ] ;do echo \"foo\";sleep 5;done|";
          while (<PIPE>){print}};
     print $@'