141 lines
4.6 KiB
HTML
141 lines
4.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>dlerror</title>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="dlerror"></a> <a name="tag_03_110"></a><!-- dlerror -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_110_01"></a>NAME</h4>
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<blockquote>dlerror - get diagnostic information</blockquote>
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<h4><a name="tag_03_110_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/dlfcn.h.html">dlfcn.h</a>><br>
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<br>
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char *dlerror(void); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_110_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>dlerror</i>() function shall return a null-terminated character string (with no trailing <newline>) that describes
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the last error that occurred during dynamic linking processing. If no dynamic linking errors have occurred since the last
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invocation of <i>dlerror</i>(), <i>dlerror</i>() shall return NULL. Thus, invoking <i>dlerror</i>() a second time, immediately
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following a prior invocation, shall result in NULL being returned.</p>
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<p>The <i>dlerror</i>() function need not be reentrant. A function that is not required to be reentrant is not required to be
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thread-safe.</p>
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</blockquote>
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<h4><a name="tag_03_110_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, <i>dlerror</i>() shall return a null-terminated character string; otherwise, NULL shall be returned.</p>
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</blockquote>
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<h4><a name="tag_03_110_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_110_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>The following example prints out the last dynamic linking error:</p>
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<pre>
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<tt>...
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#include <dlfcn.h>
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<br>
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char *errstr;
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<br>
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errstr = dlerror();
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if (errstr != NULL)
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printf ("A dynamic linking error occurred: (%s)\n", errstr);
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...
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_110_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The messages returned by <i>dlerror</i>() may reside in a static buffer that is overwritten on each call to <i>dlerror</i>().
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Application code should not write to this buffer. Programs wishing to preserve an error message should make their own copies of
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that message. Depending on the application environment with respect to asynchronous execution events, such as signals or other
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asynchronous computation sharing the address space, conforming applications should use a critical section to retrieve the error
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pointer and buffer.</p>
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</blockquote>
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<h4><a name="tag_03_110_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_110_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_110_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="dlclose.html"><i>dlclose</i>()</a> , <a href="dlopen.html"><i>dlopen</i>()</a> , <a href=
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"dlsym.html"><i>dlsym</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/dlfcn.h.html"><i><dlfcn.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_110_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5.</p>
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</blockquote>
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<h4><a name="tag_03_110_12"></a>Issue 6</h4>
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<blockquote>
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<p>In the DESCRIPTION the note about reentrancy and thread-safety is added.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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