Re^2: How to use alarm?

It's because that example is using die (vs. print) and the way die needs \n to avoid printing $! (which will affect the comparison against that die message later in that example).

The OPs problem is just buffering. Either

$| = 1;
$SIG{ALRM} = sub {print "checking"};
[download]

$SIG{ALRM} = sub {print "checking\n"};
[download]

fixes his problem.

Comment on Re^2: How to use alarm? Select or Download Code

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Re^3: How to use alarm? by Fletch (Bishop) on Jul 26, 2008 at 03:06 UTC
A last argument to die ending in something other than `\n` prints the file and line where the die was called, not $!.</pedant> The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l]
Re^4: How to use alarm? by bart (Canon) on Jul 27, 2008 at 08:05 UTC
I wouldn't call that pedantry: thinking the die message includes the value of $! by default is a serious misunderstanding of die, in disagreement of the "best practice" to include $! in the error message yourself.	[reply]
Re^4: How to use alarm? by friedo (Prior) on Jul 26, 2008 at 03:26 UTC
<pedant>You forgot to open your pedant tag.</pedant>	[reply]
Re^5: How to use alarm? by blazar (Canon) on Jul 26, 2008 at 08:13 UTC
I personally believe that you should know that the reason why is that Fletch is so pedant that he opened it when you were still wearing diapers, you pedantry-n00b! ;)`</humour>` `--` If you can't understand the incipit, then please check the IPB Campaign.	[reply] [d/l] [select]
Re^6: How to use alarm? by Anonymous Monk on Jul 26, 2008 at 10:02 UTC
Re^4: How to use alarm? by broomduster (Priest) on Jul 26, 2008 at 09:51 UTC
<mea_culpa> Indeed. Shoulda re-read the doc before punching 'create'. </mea_culpa> Long week.	[reply]