This is probably the best starting point, even if not that great:
https://codesearch.isocpp.org/cgi-bin/cgi_ppsearch?q=signal&search=Search


On Sun, Jun 2, 2019 at 1:00 PM Niall Douglas <s_sourceforge_at_[hidden]>
wrote:

> >> If not, and particularly if a majority on SG12 agrees me with that
> >> signal() is almost useless and almost no newly written production code
> >> written in the past 20 years has used it, would SG12 prefer to see a
> >> proposed wholesale replacement for signal(), which we send to
> deprecation?
> >
> > Sounds plausible. Do we have any code search results about the use of
> signal()?
>
> Sigh. I knew somebody was going to ask that.
>
> It's a great question, but since Google Code Search shut down, I am
> unaware of any free of cost search engine which can case sensitively
> match "[^a-z0-9_:]signal\(", and which has a non-toy corpus.
>
> As an illustration of how impossible current search tooling is:
>
> Probably accurate enough 554K results
>
> https://github.com/search?q=extension%3Ac+extension%3Acpp+%22sigaction+sig%22
>
> Confounded by Qt 621k results
> https://github.com/search?q=extension%3Ac+extension%3Acpp+%22signal+sig%22
>
>
> I can't get the regex search on http://opensearch.krugle.org to work.
>
> https://searchcode.com/ no longer appears to match punctuation nor case.
>
> Chromium code search works well:
>
> https://cs.chromium.org/search/?q=%5B%5Ea-z0-9_:%5Dsignal%5C(+case:yes&type=cs
> shows that the only use of standard signal() is for a unit test on
> non-POSIX platforms. sigaction() is used throughout:
>
> https://cs.chromium.org/search/?q=%5B%5Ea-z0-9_:%5Dsigaction%5C(+case:yes&type=cs
> .
> But that's one, modern, codebase. Hardly representative.
>
>
> If anybody reading can help with giving a better answer to Ville's
> question, it would be very useful.
>
> Niall
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