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99 lines
4.0 KiB
HTML
99 lines
4.0 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>perror (The Red Hat newlib C Library)</title>
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<meta name="description" content="perror (The Red Hat newlib C Library)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Stdio.html#Stdio" rel="up" title="Stdio">
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<link href="putc.html#putc" rel="next" title="putc">
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</head>
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<body lang="en">
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<a name="perror"></a>
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<div class="header">
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<p>
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Next: <a href="putc.html#putc" accesskey="n" rel="next">putc</a>, Previous: <a href="open_005fmemstream.html#open_005fmemstream" accesskey="p" rel="prev">open_memstream</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="perror_002d_002d_002dprint-an-error-message-on-standard-error"></a>
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<h3 class="section">4.44 <code>perror</code>—print an error message on standard error</h3>
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<a name="index-perror"></a>
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<a name="index-_005fperror_005fr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdio.h>
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void perror(char *<var>prefix</var>);
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void _perror_r(struct _reent *<var>reent</var>, char *<var>prefix</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Use <code>perror</code> to print (on standard error) an error message
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corresponding to the current value of the global variable <code>errno</code>.
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Unless you use <code>NULL</code> as the value of the argument <var>prefix</var>, the
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error message will begin with the string at <var>prefix</var>, followed by a
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colon and a space (<code>: </code>). The remainder of the error message is one
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of the strings described for <code>strerror</code>.
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</p>
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<p>The alternate function <code>_perror_r</code> is a reentrant version. The
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extra argument <var>reent</var> is a pointer to a reentrancy structure.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>perror</code> returns no result.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>perror</code>, but the strings issued vary from one
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implementation to another.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
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<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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<br>
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</html>
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