I'd like to implement a SIGINT handler to save a file in the event that it receives an interrupt. Unfortunately, as soon as I override $SIG{INT}, my interrupt (ctrl-c) is delayed until the current operation is complete. I have a program that needs to be dormant until a given day of the week. I thought I'd just have the program sleep for a day and when it wakes up, check the date. It is running in Windows. Waiting a day for the signal to be processed is no good. Without the save feature: 
while (1) {
    # get the date
    if ((localtime)[6] eq 4) {
        # do processing
        ...
    } else {
        sleep 86400;
    }
}

[download]
After a ctrl-c is issued, the program immediately terminates. If I try to get some kind of shutdown hook implemented like below... 
my $interrupted = 0;
$SIG{INT} = sub { $interrupted = 1; &save_file; die; };
while (!$interrupted) {
    # get the date
    if ((localtime)[6] eq 4) {
        # do processing
        ...
    } else {
        sleep 86400;
    }
}

[download]
... the signal doesn't get acted upon until the sleep statement finishes. Or perhaps there is a better way to do this.

In reply to SIGINT Handler by nwboy74

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