On many platforms sleep will exit on any signal, including SIGINT. You need to place it in a loop. For example:
use warnings;
use strict;

$SIG{'INT'}=sub {print "Clive Darke rules!\n";};

while (1) {
    sleep 10000;
}

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In reply to Re^2: INT signal kills process run with expect, when $SIG{'INT'} is set by cdarke
in thread INT signal kills process run with expect, when $SIG{'INT'} is set by ISAI student

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