Help for this page

Select Code to Download


  1. or download this
    $ perl -e'alarm 1;printf "Num: %d\tTime left: %f\n", select undef, und
+ef, undef, 3.0'
Alarm clock
$
  2. or download this
    $ time perl -e'alarm 5;printf "Num: %d\tTime left: %f\n", select undef
+, undef, undef, 3.0'
Num: 0    Time left: 0.000000
$
  3. or download this
    $ perl -e'$SIG{ALRM}=sub {};alarm 1;printf "Num: %d\tTime left: %f\n",
+ select undef, undef, undef, 3.0'
Num: -1    Time left: 2.000000
$
  4. or download this
    $ perl -e'printf "OS: %s\tNum: %d\tTime left: %f\n", $^O, select undef, undef, undef, 1.5'