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      <h1 class="title">std/oserrors</h1>
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    <summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
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      <li><a class="reference" href="#OSErrorCode" title="OSErrorCode = distinct int32">OSErrorCode</a></li>

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      <ul class="simple nested-toc-section">$
  <li><a class="reference" href="#%24%2COSErrorCode" title="`$`(err: OSErrorCode): string">`$`(err: OSErrorCode): string</a></li>

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<ul class="simple nested-toc-section">==
  <li><a class="reference" href="#%3D%3D%2COSErrorCode%2COSErrorCode" title="`==`(err1, err2: OSErrorCode): bool">`==`(err1, err2: OSErrorCode): bool</a></li>

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<ul class="simple nested-toc-section">newOSError
  <li><a class="reference" href="#newOSError%2COSErrorCode%2Cstring" title="newOSError(errorCode: OSErrorCode; additionalInfo = &quot;&quot;): owned(ref OSError)">newOSError(errorCode: OSErrorCode; additionalInfo = &quot;&quot;): owned(ref OSError)</a></li>

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<ul class="simple nested-toc-section">osErrorMsg
  <li><a class="reference" href="#osErrorMsg%2COSErrorCode" title="osErrorMsg(errorCode: OSErrorCode): string">osErrorMsg(errorCode: OSErrorCode): string</a></li>

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<ul class="simple nested-toc-section">osLastError
  <li><a class="reference" href="#osLastError" title="osLastError(): OSErrorCode">osLastError(): OSErrorCode</a></li>

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<ul class="simple nested-toc-section">raiseOSError
  <li><a class="reference" href="#raiseOSError%2COSErrorCode%2Cstring" title="raiseOSError(errorCode: OSErrorCode; additionalInfo = &quot;&quot;)">raiseOSError(errorCode: OSErrorCode; additionalInfo = &quot;&quot;)</a></li>

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  <div class="nine columns" id="content">
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

    <div id="tocRoot"></div>
    
    <p class="module-desc">The <tt class="docutils literal"><span class="pre"><span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">oserrors</span></span></tt> module implements OS error reporting.</p>
    <div class="section" id="7">
  <h1><a class="toc-backref" href="#7">Types</a></h1>
  <dl class="item">
    <div id="OSErrorCode">
  <dt><pre><a href="oserrors.html#OSErrorCode"><span class="Identifier">OSErrorCode</span></a> <span class="Other">=</span> <span class="Keyword">distinct</span> <a href="system.html#int32"><span class="Identifier">int32</span></a></pre></dt>
  <dd>
    
    Specifies an OS Error Code.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L14" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L14" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

  </dl>
</div>
<div class="section" id="12">
  <h1><a class="toc-backref" href="#12">Procs</a></h1>
  <dl class="item">
    <div id="$-procs-all">
  <div id="$,OSErrorCode">
  <dt><pre><span class="Keyword">proc</span> <a href="#%24%2COSErrorCode"><span class="Identifier">`$`</span></a><span class="Other">(</span><span class="Identifier">err</span><span class="Other">:</span> <a href="oserrors.html#OSErrorCode"><span class="Identifier">OSErrorCode</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a> {.<span class="Identifier">borrow</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L28" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L28" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="==-procs-all">
  <div id="==,OSErrorCode,OSErrorCode">
  <dt><pre><span class="Keyword">proc</span> <a href="#%3D%3D%2COSErrorCode%2COSErrorCode"><span class="Identifier">`==`</span></a><span class="Other">(</span><span class="Identifier">err1</span><span class="Other">,</span> <span class="Identifier">err2</span><span class="Other">:</span> <a href="oserrors.html#OSErrorCode"><span class="Identifier">OSErrorCode</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#bool"><span class="Identifier">bool</span></a> {.<span class="Identifier">borrow</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L27" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L27" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="newOSError-procs-all">
  <div id="newOSError,OSErrorCode,string">
  <dt><pre><span class="Keyword">proc</span> <a href="#newOSError%2COSErrorCode%2Cstring"><span class="Identifier">newOSError</span></a><span class="Other">(</span><span class="Identifier">errorCode</span><span class="Other">:</span> <a href="oserrors.html#OSErrorCode"><span class="Identifier">OSErrorCode</span></a><span class="Other">;</span> <span class="Identifier">additionalInfo</span> <span class="Other">=</span> <span class="StringLit">&quot;&quot;</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">owned</span><span class="Other">(</span><span class="Keyword">ref</span> <a href="exceptions.html#OSError"><span class="Identifier">OSError</span></a><span class="Other">)</span> {.
    <span class="Identifier">noinline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    <p>Creates a new <a class="reference external" href="system.html#OSError">OSError exception</a>.</p>
<p>The <tt class="docutils literal"><span class="pre"><span class="Identifier">errorCode</span></span></tt> will determine the message, <a class="reference internal nimdoc" title="proc osErrorMsg(errorCode: OSErrorCode): string" href="#osErrorMsg,OSErrorCode">osErrorMsg proc</a> will be used to get this message.</p>
<p>The error code can be retrieved using the <a class="reference internal nimdoc" title="proc osLastError(): OSErrorCode" href="#osLastError">osLastError proc</a>.</p>
<p>If the error code is <tt class="docutils literal"><span class="pre"><span class="DecNumber">0</span></span></tt> or an error message could not be retrieved, the message <tt class="docutils literal"><span class="pre"><span class="Identifier">unknown</span> <span class="Identifier">OS</span> <span class="Identifier">error</span></span></tt> will be used.</p>
<p>See also:</p>
<ul class="simple"><li><a class="reference internal nimdoc" title="proc osErrorMsg(errorCode: OSErrorCode): string" href="#osErrorMsg,OSErrorCode">osErrorMsg proc</a></li>
<li><a class="reference internal nimdoc" title="proc osLastError(): OSErrorCode" href="#osLastError">osLastError proc</a></li>
</ul>

    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L61" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L61" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="osErrorMsg-procs-all">
  <div id="osErrorMsg,OSErrorCode">
  <dt><pre><span class="Keyword">proc</span> <a href="#osErrorMsg%2COSErrorCode"><span class="Identifier">osErrorMsg</span></a><span class="Other">(</span><span class="Identifier">errorCode</span><span class="Other">:</span> <a href="oserrors.html#OSErrorCode"><span class="Identifier">OSErrorCode</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    <p>Converts an OS error code into a human readable string.</p>
<p>The error code can be retrieved using the <a class="reference internal nimdoc" title="proc osLastError(): OSErrorCode" href="#osLastError">osLastError proc</a>.</p>
<p>If conversion fails, or <tt class="docutils literal"><span class="pre"><span class="Identifier">errorCode</span></span></tt> is <tt class="docutils literal"><span class="pre"><span class="DecNumber">0</span></span></tt> then <tt class="docutils literal"><span class="pre"><span class="StringLit">&quot;&quot;</span></span></tt> will be returned.</p>
<p>See also:</p>
<ul class="simple"><li><a class="reference internal nimdoc" title="proc raiseOSError(errorCode: OSErrorCode; additionalInfo = &quot;&quot;)" href="#raiseOSError,OSErrorCode,string">raiseOSError proc</a></li>
<li><a class="reference internal nimdoc" title="proc osLastError(): OSErrorCode" href="#osLastError">osLastError proc</a></li>
</ul>

<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">when</span> <span class="Identifier">defined</span><span class="Punctuation">(</span><span class="Identifier">linux</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
  <span class="Identifier">assert</span> <span class="Identifier">osErrorMsg</span><span class="Punctuation">(</span><span class="Identifier">OSErrorCode</span><span class="Punctuation">(</span><span class="DecNumber">0</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="StringLit">&quot;&quot;</span>
  <span class="Identifier">assert</span> <span class="Identifier">osErrorMsg</span><span class="Punctuation">(</span><span class="Identifier">OSErrorCode</span><span class="Punctuation">(</span><span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="StringLit">&quot;Operation not permitted&quot;</span>
  <span class="Identifier">assert</span> <span class="Identifier">osErrorMsg</span><span class="Punctuation">(</span><span class="Identifier">OSErrorCode</span><span class="Punctuation">(</span><span class="DecNumber">2</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="StringLit">&quot;No such file or directory&quot;</span></pre>
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L30" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L30" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="osLastError-procs-all">
  <div id="osLastError">
  <dt><pre><span class="Keyword">proc</span> <a href="#osLastError"><span class="Identifier">osLastError</span></a><span class="Other">(</span><span class="Other">)</span><span class="Other">:</span> <a href="oserrors.html#OSErrorCode"><span class="Identifier">OSErrorCode</span></a> {.<span class="Identifier">sideEffect</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    <p>Retrieves the last operating system error code.</p>
<p>This procedure is useful in the event when an OS call fails. In that case this procedure will return the error code describing the reason why the OS call failed. The <tt class="docutils literal"><span class="pre"><span class="Identifier">OSErrorMsg</span></span></tt> procedure can then be used to convert this code into a string.</p>
<div class="admonition admonition-warning"><span class="admonition-warning-text"><b>Warning:</b></span>
The behaviour of this procedure varies between Windows and POSIX systems. On Windows some OS calls can reset the error code to <tt class="docutils literal"><span class="pre"><span class="DecNumber">0</span></span></tt> causing this procedure to return <tt class="docutils literal"><span class="pre"><span class="DecNumber">0</span></span></tt>. It is therefore advised to call this procedure immediately after an OS call fails. On POSIX systems this is not a problem.</div>
<p>See also:</p>
<ul class="simple"><li><a class="reference internal nimdoc" title="proc osErrorMsg(errorCode: OSErrorCode): string" href="#osErrorMsg,OSErrorCode">osErrorMsg proc</a></li>
<li><a class="reference internal nimdoc" title="proc raiseOSError(errorCode: OSErrorCode; additionalInfo = &quot;&quot;)" href="#raiseOSError,OSErrorCode,string">raiseOSError proc</a></li>
</ul>

    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L95" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L95" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="raiseOSError-procs-all">
  <div id="raiseOSError,OSErrorCode,string">
  <dt><pre><span class="Keyword">proc</span> <a href="#raiseOSError%2COSErrorCode%2Cstring"><span class="Identifier">raiseOSError</span></a><span class="Other">(</span><span class="Identifier">errorCode</span><span class="Other">:</span> <a href="oserrors.html#OSErrorCode"><span class="Identifier">OSErrorCode</span></a><span class="Other">;</span> <span class="Identifier">additionalInfo</span> <span class="Other">=</span> <span class="StringLit">&quot;&quot;</span><span class="Other">)</span> {.<span class="Identifier">noinline</span><span class="Other">,</span>
    <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    <p>Raises an <a class="reference external" href="system.html#OSError">OSError exception</a>.</p>
<p>Read the description of the <a class="reference internal nimdoc" title="proc newOSError(errorCode: OSErrorCode; additionalInfo = &quot;&quot;): owned(ref OSError)" href="#newOSError,OSErrorCode,string">newOSError proc</a> to learn how the exception object is created.</p>

    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/oserrors.nim#L87" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/oserrors.nim#L87" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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