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Re: The number of ways I've independently discovered to make Perl segfault:

by dws (Chancellor)
on Sep 24, 2003 at 17:35 UTC ( #293947=note: print w/replies, xml ) Need Help??


in reply to The number of ways I've independently discovered to make Perl segfault:

I've discovered ways to make XS-based modules segfault, but not Perl proper. Since it'd be unfair to point the finger at Perl for some third-party's C problems, I have to vote zero.

  • Comment on Re: The number of ways I've independently discovered to make Perl segfault:

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Re: Re: The number of ways I've independently discovered to make Perl segfault:
by tilly (Archbishop) on Oct 05, 2003 at 17:19 UTC
    I've had particular success with segfaulting Perl 5.6.1. My latest was an overload which returned an undef as a string. Worked fine under 5.8.0...

    Another good place to look for segfaults is in the RE engine.

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[ambrus]: However, I also looked at the internals, and found two interesting things:
[marto]: stupid xpath question, I have a xpath copied from the browser, is the * wildcard supposed to work for IDs? e.g. '//*[@id="*"]/ div/div/header/p/a '?
[ambrus]: The main loop for unixish systems is in https://metacpan. org/source/ KARASIK/Prima-1. 49/unix/apc_app.c. It is a hand-rolled select loop, but also always spins at least once every 0.2 seconds for some reason.
[ambrus]: marto: no, not that way. if you just want to test for an existing id attribute, then write *[@id] , or you can match a regexp to the value of that attribute like *[@id=~/something/ ]
[marto]: ambrus, thanks I ended up going with '//*[starts- with(@id, "thread_")]...
[ambrus]: Sometimes it's easier to just match elements in ways other than xpath, like directly with perl code.

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