contents/using-lttng/instrumenting/c-application/building-linking/using-lttng-ust-with-daemons.md

   1 ---
   2 id: using-lttng-ust-with-daemons
   3 ---
   4
   5 Some extra care is needed when using `liblttng-ust` with daemon
   6 applications that call `fork()`, `clone()` or BSD's `rfork()` without
   7 a following `exec()` family system call. The `liblttng-ust-fork`
   8 library must be preloaded for the application.
   9
  10 Example:
  11
  12 <pre class="term">
  13 <strong>LD_PRELOAD=liblttng-ust-fork.so</strong> ./app
  14 </pre>
  15
  16 Or, if you're using a tracepoint provider shared library:
  17
  18 <pre class="term">
  19 <strong>LD_PRELOAD="liblttng-ust-fork.so /path/to/tp.so"</strong> ./app
  20 </pre>