From 07dda6914ac1354b53da50d1b43cf439102c1bcc Mon Sep 17 00:00:00 2001
From: johannst <johannst@users.noreply.github.com>
Date: Sat, 9 Nov 2024 10:42:31 +0000
Subject: deploy: 3d599bcbf6771def1076c3e9561bc748956dfc94

---
 trace_profile/ltrace.html | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'trace_profile/ltrace.html')

diff --git a/trace_profile/ltrace.html b/trace_profile/ltrace.html
index ff424d0..d055b19 100644
--- a/trace_profile/ltrace.html
+++ b/trace_profile/ltrace.html
@@ -162,10 +162,24 @@
   -o &lt;file&gt; ... log output into &lt;file&gt;
   -l &lt;filter&gt; . show who calls into lib matched by &lt;filter&gt;
   -C .......... demangle
+  -x &lt;filter&gt; . which symbol table entry points to trace
+                (can be of form sym_pattern@lib_pattern)
 </code></pre>
 <h1 id="example"><a class="header" href="#example">Example</a></h1>
 <p>List which program/libs call into <code>libstdc++</code>:</p>
 <pre><code class="language-bash">ltrace -l '*libstdc++*' -C -o ltrace.log ./main
+</code></pre>
+<p>Trace symbols from <code>dlopen(3)</code>ed libraries.</p>
+<pre><code class="language-bash"># Assume libfoo.so would be dynamically loaded via dlopen.
+ltrace -x '@libfoo.so'
+
+# Trace all dlopened symbols.
+ltrace -x '*'
+# Trace all symbols from dlopened libraries which name match the
+# pattern "liby*".
+ltrace -x '@liby*'
+# Trace symbol "foo" from all dlopened libraries matching the pattern.
+ltrace -x 'foo@liby*'
 </code></pre>
 
                     </main>
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