dlclose.html
来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 110 行
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>dlclose</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_003_118"> </a>NAME</h4><blockquote>dlclose - close a dlopen() object</blockquote><h4><a name = "tag_000_003_119"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="dlfcn.h.html">dlfcn.h</a>>int dlclose(void <i>*handle</i>);</code></pre></blockquote><h4><a name = "tag_000_003_120"> </a>DESCRIPTION</h4><blockquote><i>dlclose()</i>is used to inform the system that the object referenced by a<i>handle</i>returned from a previous<i><a href="dlopen.html">dlopen()</a></i>invocation is no longer needed by the application. <p>The use of<i>dlclose()</i>reflects a statement of intent on the part of the process, but does not create any requirement upon the implementation, such as removal of the code or symbols referenced by<i>handle</i>.Once an object has been closed using<i>dlclose()</i>an application should assume thatits symbols are no longer available to<i><a href="dlsym.html">dlsym()</a></i>.All objects loaded automatically as a result of invoking<i><a href="dlopen.html">dlopen()</a></i>on the referenced object are also closed.<p>Although a<i>dlclose()</i>operation is not required to remove structures from an address space, neitheris an implementation prohibited from doing so. The only restriction on such aremoval is that no object will be removed to which references have beenrelocated, until or unless all such references are removed. For instance,an object that had been loaded with a<i><a href="dlopen.html">dlopen()</a></i>operation specifying the RTLD_GLOBALflag might provide a target for dynamic relocations performed in theprocessing of other objects - in such environments, an application may assumethat no relocation, once made, will be undone or remade unless the objectrequiring the relocation has itself been removed.</blockquote><h4><a name = "tag_000_003_121"> </a>RETURN VALUE</h4><blockquote>If the referenced object was successfully closed,<i>dlclose()</i>returns 0. If the object could not be closed, or if<i>handle</i>does not refer to an open object, <i>dlclose()</i>returns a non-zero value. More detailed diagnostic information will beavailable through<i><a href="dlerror.html">dlerror()</a></i>.</blockquote><h4><a name = "tag_000_003_122"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_003_123"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_003_124"> </a>APPLICATION USAGE</h4><blockquote>A portable application will employ a<i>handle</i>returned from a <i><a href="dlopen.html">dlopen()</a></i>invocation only within a given scope bracketed by the<i><a href="dlopen.html">dlopen()</a></i>and<i>dlclose()</i>operations. Implementations are free to use reference counting or othertechniques such that multiple calls to <i><a href="dlopen.html">dlopen()</a></i>referencing the same object may return the same object for<i>handle</i>.Implementations are also free to re-use a<i>handle</i>.For these reasons, the value of a<i>handle</i>must be treated as an opaque object by the application, used only in callsto <i><a href="dlsym.html">dlsym()</a></i>and<i>dlclose()</i>.</blockquote><h4><a name = "tag_000_003_125"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_003_126"> </a>SEE ALSO</h4><blockquote><i><a href="dlerror.html">dlerror()</a></i>,<i><a href="dlopen.html">dlopen()</a></i>,<i><a href="dlsym.html">dlsym()</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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