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Re: Perl's Warn and Die Signals

by broquaint (Abbot)
on Feb 11, 2002 at 14:41 UTC ( #144640=note: print w/replies, xml ) Need Help??

in reply to Perl's Warn and Die Signals

I'd just like to note that although $SIG{__DIE__} may be given a standard perl function (be it in the form of an anonymous sub or reference to a named sub), it performs 'magic' on it's provided arguments e.g
$SIG{__DIE__} = sub { print "$0: $_\n" for @_ }; die("a", "bunch", "of", "arguments"); __END__ output - -: abunchofarguments at - line 2. abunchofarguments at - line 2.
So even though you are given greater control over the exit of your program, it's still not a good time to be performing complex operations with your die() handler.
For further info about the munging of $SIG{__DIE__}'s arguments see this node or check out pp_sys.c in the perl source.


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[karlgoethebier]: perldigious: perhaps a block if you are paranoid ;-)
[choroba]: but undef %hash and %hash = () both work, too, but the first one keeps the memory allocated, while the latter makes it available for other parts of the program.
[choroba]: iirc
[perldigious]: karlgoethebier: Well it is a pretty old and complicated (for me) bit of code I wrote (poorly by my current standards), so I'm expecting everything to break when I add the scoping and find out what else is undesireably scope changed. :-)
[perldigious]: Ah, thanks choroba, that sort of thing was precisely what I was wondering when I asked.
[perldigious]: I didn't want to tie up memory unecessarily basically, I wanted to "delete" it specifically to free it up, and wasn't sure I was even accomplishing that.

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