118 lines
7 KiB
HTML
118 lines
7 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Error Reporting (Guile Reference Manual)</title>
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<meta name="description" content="Error Reporting (Guile Reference Manual)">
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<meta name="keywords" content="Error Reporting (Guile Reference Manual)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content=".texi2any-real">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Control-Mechanisms.html" rel="up" title="Control Mechanisms">
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<link href="Dynamic-Wind.html" rel="next" title="Dynamic Wind">
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<link href="Exceptions.html" rel="prev" title="Exceptions">
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<style type="text/css">
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a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
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strong.def-name {font-family: monospace; font-weight: bold; font-size: larger}
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</style>
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Error-Reporting">
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<div class="nav-panel">
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<p>
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Next: <a href="Dynamic-Wind.html" accesskey="n" rel="next">Dynamic Wind</a>, Previous: <a href="Exceptions.html" accesskey="p" rel="prev">Exceptions</a>, Up: <a href="Control-Mechanisms.html" accesskey="u" rel="up">Controlling the Flow of Program Execution</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsection" id="Procedures-for-Signaling-Errors"><span>6.11.9 Procedures for Signaling Errors<a class="copiable-link" href="#Procedures-for-Signaling-Errors"> ¶</a></span></h4>
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<p>Guile provides a set of convenience procedures for signaling error
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conditions that are implemented on top of the exception primitives just
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described.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-error-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">error</strong> <var class="def-var-arguments">msg arg …</var><a class="copiable-link" href="#index-error-1"> ¶</a></span></dt>
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<dd><p>Raise an error with key <code class="code">misc-error</code> and a message constructed by
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displaying <var class="var">msg</var> and writing <var class="var">arg</var> <small class="enddots">...</small>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-scm_002derror"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">scm-error</strong> <var class="def-var-arguments">key subr message args data</var><a class="copiable-link" href="#index-scm_002derror"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005ferror_005fscm"><span class="category-def">C Function: </span><span><strong class="def-name">scm_error_scm</strong> <var class="def-var-arguments">(key, subr, message, args, data)</var><a class="copiable-link" href="#index-scm_005ferror_005fscm"> ¶</a></span></dt>
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<dd><p>Raise an error with key <var class="var">key</var>. <var class="var">subr</var> can be a string
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naming the procedure associated with the error, or <code class="code">#f</code>.
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<var class="var">message</var> is the error message string, possibly containing
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<code class="code">~S</code> and <code class="code">~A</code> escapes. When an error is reported,
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these are replaced by formatting the corresponding members of
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<var class="var">args</var>: <code class="code">~A</code> (was <code class="code">%s</code> in older versions of
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Guile) formats using <code class="code">display</code> and <code class="code">~S</code> (was
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<code class="code">%S</code>) formats using <code class="code">write</code>. <var class="var">data</var> is a list or
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<code class="code">#f</code> depending on <var class="var">key</var>: if <var class="var">key</var> is
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<code class="code">system-error</code> then it should be a list containing the
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Unix <code class="code">errno</code> value; If <var class="var">key</var> is <code class="code">signal</code> then it
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should be a list containing the Unix signal number; If
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<var class="var">key</var> is <code class="code">out-of-range</code>, <code class="code">wrong-type-arg</code>,
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or <code class="code">keyword-argument-error</code>,
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it is a list containing the bad value; otherwise
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it will usually be <code class="code">#f</code>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-strerror"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">strerror</strong> <var class="def-var-arguments">err</var><a class="copiable-link" href="#index-strerror"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fstrerror"><span class="category-def">C Function: </span><span><strong class="def-name">scm_strerror</strong> <var class="def-var-arguments">(err)</var><a class="copiable-link" href="#index-scm_005fstrerror"> ¶</a></span></dt>
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<dd><p>Return the Unix error message corresponding to <var class="var">err</var>, an integer
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<code class="code">errno</code> value.
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</p>
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<p>When <code class="code">setlocale</code> has been called (see <a class="pxref" href="Locales.html">Locales</a>), the message
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is in the language and charset of <code class="code">LC_MESSAGES</code>. (This is done
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by the C library.)
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-false_002dif_002dexception"><span class="category-def">syntax: </span><span><strong class="def-name">false-if-exception</strong> <var class="def-var-arguments">expr</var><a class="copiable-link" href="#index-false_002dif_002dexception"> ¶</a></span></dt>
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<dd><p>Returns the result of evaluating its argument; however
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if an exception occurs then <code class="code">#f</code> is returned instead.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Dynamic-Wind.html">Dynamic Wind</a>, Previous: <a href="Exceptions.html">Exceptions</a>, Up: <a href="Control-Mechanisms.html">Controlling the Flow of Program Execution</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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