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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- This manual is for libffi, a portable foreign function interface library. Copyright (C) 2008-2019, 2021 Anthony Green and Red Hat, Inc. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --> <title>Memory Usage (libffi: the portable foreign function interface library)</title> <meta name="description" content="Memory Usage (libffi: the portable foreign function interface library)"> <meta name="keywords" content="Memory Usage (libffi: the portable foreign function interface library)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta name="viewport" content="width=device-width,initial-scale=1"> <link href="index.html" rel="start" title="Top"> <link href="Index.html" rel="index" title="Index"> <link href="index.html" rel="up" title="Top"> <link href="Missing-Features.html" rel="next" title="Missing Features"> <link href="Using-libffi.html" rel="prev" title="Using libffi"> <style type="text/css"> <!-- a.copiable-anchor {visibility: hidden; text-decoration: none; line-height: 0em} a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} span:hover a.copiable-anchor {visibility: visible} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <div class="chapter" id="Memory-Usage"> <div class="header"> <p> Next: <a href="Missing-Features.html" accesskey="n" rel="next">Missing Features</a>, Previous: <a href="Using-libffi.html" accesskey="p" rel="prev">Using libffi</a>, Up: <a href="index.html" accesskey="u" rel="up">libffi</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p> </div> <hr> <span id="Memory-Usage-1"></span><h2 class="chapter">3 Memory Usage</h2> <p>Note that memory allocated by <code>ffi_closure_alloc</code> and freed by <code>ffi_closure_free</code> does not come from the same general pool of memory that <code>malloc</code> and <code>free</code> use. To accomodate security settings, ‘<samp>libffi</samp>’ 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> <li> A anonymous mapping (i.e. not file-backed) </li><li> <code>memfd_create()</code>, if the kernel supports it. </li><li> A file created in the directory referenced by the environment variable <code>LIBFFI_TMPDIR</code>. </li><li> Likewise for the environment variable <code>TMPDIR</code>. </li><li> A file created in <code>/tmp</code>. </li><li> A file created in <code>/var/tmp</code>. </li><li> A file created in <code>/dev/shm</code>. </li><li> A file created in the user’s home directory (<code>$HOME</code>). </li><li> A file created in any directory listed in <code>/etc/mtab</code>. </li><li> A file created in any directory listed in <code>/proc/mounts</code>. </li></ul> <p>If security settings prohibit using any of these for closures, <code>ffi_closure_alloc</code> will fail. </p> </div> </body> </html>
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