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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1340#note_423164138">discussion</a>:
</p>
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<p dir="auto"><a href="https://gitlab.com/simo5" data-user="2918402" data-reference-type="user" data-container="body" data-placement="top" class="gfm gfm-project_member js-user-link" title="Simo Sorce">@simo5</a> I don't get what you are asking for (i.e., code example for what). If you are looking for the code that "uses" those traces, then there shouldn't be any difference: you can use your favorite tracing tool that supports USDT e.g. systemtap. The GNOME documentation for that is:</p>
<blockquote dir="auto">
<p>GLib ships with a file libglib-2.0.so.<em>.stp which defines a set of probe points, which you can hook into with custom SystemTap scripts. See the files libglib-2.0.so.</em>.stp, libgobject-2.0.so.<em>.stp and libgio-2.0.so.</em>.stp which are in your shared SystemTap scripts directory.</p>
</blockquote>
<p dir="auto">If you are looking for the code that "defines" those "traces" everything is linked from the above NSS comment.</p>
<p dir="auto">In short, pre-processing <code>.d</code> files (rather than post-processing the resulting ELF binary with Perl... script) allows the USDT to be defined in a declarative way (and thus prevents misuses) and serves documentation.</p>
<p dir="auto">The same pattern is also used in sssd, which you must be familiar with:
<a href="https://github.com/SSSD/sssd/blob/master/src/systemtap/sssd_probes.d" rel="nofollow noreferrer noopener" target="_blank">https://github.com/SSSD/sssd/blob/master/src/systemtap/sssd_probes.d</a></p>
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