sleep sleeps integer seconds and returns the integer number of seconds actually slept.
#!/usr/bin/perl
use strict;
use warnings;
my $total_sleep_time = 0;
BEGIN {
*CORE::GLOBAL::sleep = sub(@)
{
$total_sleep_time += CORE::sleep($_[0]);
}
}
print "\$]=$] \$^V=$^V\n";
sleep(2);
sleep(1);
sleep(1.3);
print "total sleep is $total_sleep_time\n";
$ time -p ./sleep.pl
$]=5.024001 $^V=v5.24.1
total sleep is 4
real 4.00
user 0.00
sys 0.00
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