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  <p class="right" id="os-0"><span id="index-0"></span><strong>object</strong></p>
<section id="os">
<h1><code class="docutils literal notranslate"><span class="pre">os</span></code><a class="headerlink" href="#os" title="Link to this heading"></a></h1>
<p>Portable operating-system access predicates.</p>
<div class="line-block">
<div class="line"><strong>Availability:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">logtalk_load(os(loader))</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Author:</strong> Paulo Moura</div>
<div class="line"><strong>Version:</strong> 1:101:2</div>
<div class="line"><strong>Date:</strong> 2024-12-01</div>
</div>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static,</span> <span class="pre">context_switching_calls</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Implements:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">public</span></code> <a class="reference internal" href="osp_0.html#osp-0"><span class="std std-ref">osp</span></a></div>
</div>
<div class="line"><strong>Uses:</strong></div>
<div class="line-block">
<div class="line"><a class="reference internal" href="list_0.html#list-0"><span class="std std-ref">list</span></a></div>
</div>
<div class="line"><strong>Aliases:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">osp</span></code> <code class="docutils literal notranslate"><span class="pre">absolute_file_name/2</span></code> as <code class="docutils literal notranslate"><span class="pre">expand_path/2</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Remarks:</strong></div>
</div>
<blockquote>
<div><ul class="simple">
<li><p>File path expansion: To ensure portability, all file paths are expanded before being handed to the backend Prolog system.</p></li>
<li><p>Exception terms: Currently, there is no standardization of the exception terms thrown by the different backend Prolog systems.</p></li>
<li><p>B-Prolog portability: The <code class="docutils literal notranslate"><span class="pre">wall_time/1</span></code> predicate is not supported.</p></li>
<li><p>CxProlog portability: The <code class="docutils literal notranslate"><span class="pre">date_time/7</span></code> predicate returns zeros for all arguments.</p></li>
<li><p>JIProlog portability: The <code class="docutils literal notranslate"><span class="pre">file_permission/2</span></code> and <code class="docutils literal notranslate"><span class="pre">command_line_arguments/1</span></code> predicates are not supported.</p></li>
<li><p>Quintus Prolog: The <code class="docutils literal notranslate"><span class="pre">pid/1</span></code> and <code class="docutils literal notranslate"><span class="pre">shell/2</span></code> predicates are not supported.</p></li>
<li><p>XSB portability: The <code class="docutils literal notranslate"><span class="pre">command_line_arguments/1</span></code> predicate is not supported.</p></li>
</ul>
</div></blockquote>
<div class="line-block">
<div class="line"><strong>Inherited public predicates:</strong></div>
<div class="line-block">
<div class="line"> <a class="reference internal" href="osp_0.html#osp-0-absolute-file-name-2"><span class="std std-ref">absolute_file_name/2</span></a>  <a class="reference internal" href="osp_0.html#osp-0-change-directory-1"><span class="std std-ref">change_directory/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-command-line-arguments-1"><span class="std std-ref">command_line_arguments/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-copy-file-2"><span class="std std-ref">copy_file/2</span></a>  <a class="reference internal" href="osp_0.html#osp-0-cpu-time-1"><span class="std std-ref">cpu_time/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-date-time-7"><span class="std std-ref">date_time/7</span></a>  <a class="reference internal" href="osp_0.html#osp-0-decompose-file-name-3"><span class="std std-ref">decompose_file_name/3</span></a>  <a class="reference internal" href="osp_0.html#osp-0-decompose-file-name-4"><span class="std std-ref">decompose_file_name/4</span></a>  <a class="reference internal" href="osp_0.html#osp-0-delete-directory-1"><span class="std std-ref">delete_directory/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-delete-directory-and-contents-1"><span class="std std-ref">delete_directory_and_contents/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-delete-directory-contents-1"><span class="std std-ref">delete_directory_contents/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-delete-file-1"><span class="std std-ref">delete_file/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-directory-exists-1"><span class="std std-ref">directory_exists/1</span></a>  <a class="reference internal" href="osp_0.html#osp-0-directory-files-2"><span class="std std-ref">directory_files/2</span></a>  <a class="reference internal" href="osp_0.html#osp-0-directory-files-3"><span class="std std-ref">directory_files/3</span></a>  <a 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