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<title>Memory Usage (libffi: the portable foreign function interface library)</title>

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<h2 class="chapter" id="Memory-Usage-1"><span>3 Memory Usage<a class="copiable-link" href="#Memory-Usage-1"> &para;</a></span></h2>

<p>Note that memory allocated by <code class="code">ffi_closure_alloc</code> and freed by
<code class="code">ffi_closure_free</code> does not come from the same general pool of
memory that <code class="code">malloc</code> and <code class="code">free</code> use.  To accomodate security
settings, <code class="code">libffi</code> may aquire memory, for example, by mapping
temporary files into multiple places in the address space (once to
write out the closure, a second to execute it).  The search follows
this list, using the first that works:
</p>
<ul class="itemize mark-bullet">
<li>A anonymous mapping (i.e. not file-backed)

</li><li><code class="code">memfd_create()</code>, if the kernel supports it.

</li><li>A file created in the directory referenced by the environment variable
<code class="code">LIBFFI_TMPDIR</code>.

</li><li>Likewise for the environment variable <code class="code">TMPDIR</code>.

</li><li>A file created in <code class="code">/tmp</code>.

</li><li>A file created in <code class="code">/var/tmp</code>.

</li><li>A file created in <code class="code">/dev/shm</code>.

</li><li>A file created in the user&rsquo;s home directory (<code class="code">$HOME</code>).

</li><li>A file created in any directory listed in <code class="code">/etc/mtab</code>.

</li><li>A file created in any directory listed in <code class="code">/proc/mounts</code>.

</li></ul>

<p>If security settings prohibit using any of these for closures,
<code class="code">ffi_closure_alloc</code> will fail.
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