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Date: Thu, 28 May 2015 15:23:27 +0530
From: Sayantan Datta <>
To: john-dev <>
Subject: Re: Signal handling within john formats.

On Wed, May 27, 2015 at 1:01 PM, Sayantan Datta <> wrote:

> Hi all,
> I'd like to use signal handling functions - alarm() and sigaction() within
> a format. Howver using them disrupts status checking, even if I restore to
> the previous signal handler after I'm done using signals.
> The sequence of function calls within the format is as follows:
> sigaction(SIGALARM, &set_signal, &old_signal);
> alarm(x);
> .
> .
> .
> alarm(0);
> sigaction(SIGALARM, &old_signal, NULL);
> But the above sequence fails to restore normal JtR signal handling. So,
> what's missing?
> Regards,
> Sayantan

Turns out restoring previous signal handler is not enough; alarm() function
interferes with setitimer() function. So, set setitimer() must also be
saved before using alarm() and then restored after calling alarm().


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