PAL.C.T MINI SHELL
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<title>ü (DSO) - Apache HTTP Server Version 2.4</title>
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<p class="menu"><a href="./mod/"></a> | <a href="./mod/directives.html">þ</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="./glossary.html"></a> | <a href="./sitemap.html">Ʈ</a></p>
<p class="apache">Apache HTTP Server Version 2.4</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.4</a></div><div id="page-content"><div id="preamble"><h1>ü (DSO) </h1>
<div class="toplang">
<p><span> : </span><a href="./en/dso.html" hreflang="en" rel="alternate" title="English"> en </a> |
<a href="./fr/dso.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
<a href="./ja/dso.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="./ko/dso.html" title="Korean"> ko </a> |
<a href="./tr/dso.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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<div class="outofdate"> ֽ ƴմϴ.
ֱٿ ϼ.</div>
<p>ġ ڰ Ͽ
ִ ȭ α̴. Ҷ
<code>httpd</code> Ͽ
ִ. ƴϸ <code>httpd</code> ϰ
иϿ ü(Dynamic Shared Objects, DSO)
ִ. DSO Ҷ ϰų, Apache
Extension Tool (<a href="programs/apxs.html">apxs</a>)
Ͽ ߿ Ͽ ߰ ִ.</p>
<p> DSO ̷ Ѵ.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#implementation"></a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#usage"> </a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#background"></a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#advantages"></a></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="implementation" id="implementation"></a></h2>
<table class="related"><tr><th>õ </th><th>õ þ</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_so.html">mod_so</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/mod_so.html#loadmodule">LoadModule</a></code></li></ul></td></tr></table>
<p>ġ ٽɿ ؾ
<code class="module"><a href="./mod/mod_so.c.html">mod_so.c</a></code> ġ
о̱ DSO Ѵ.
<code class="module"><a href="./mod/core.html">core</a></code> ϰ DSO
̴. ٸ ġ
<a href="install.html">ġ </a>
<code>configure</code> <code>--enable-<em>module</em>=shared</code>
ɼ Ͽ DSO ִ.
<code>mod_foo.so</code> DSO <code>httpd.conf</code>
Ͽ <code class="module"><a href="./mod/mod_so.html">mod_so</a></code>
<code class="directive"><a href="./mod/mod_so.html#loadmodule">LoadModule</a></code> ɾ
Ͽ ۽ Ȥ ۽ о
ִ.</p>
<p>ġ (Ư ڰ ) DSO
<a href="programs/apxs.html">apxs</a> (<em>APache
eXtenSion</em>) ο α ִ. α
ġ ҽ Ʈ <em>ۿ</em> DSO
Ҷ Ѵ. . ġ ġҶ
<code>configure</code> <code>make install</code>
ġ C ġϰ, DSO ϱ
÷ Ư Ϸ ɼǰ Ŀ ɼ <code>apxs</code>
α Ѵ. <code>apxs</code> ϴ ڴ
ġ ҽ Ʈ, DSO ÷ Ư
Ϸ ɼǿ Ŀ ɼǿ Ű ʰ ڽ ġ
ҽ ִ.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="usage" id="usage"> </a></h2>
<p>Apache 2.2 DSO ɿ ª ̴:</p>
<ol>
<li>
<em> ִ</em> ġ ϰ ġϴ
. <code>mod_foo.c</code> DSO
<code>mod_foo.so</code>:
<div class="example"><p><code>
$ ./configure --prefix=/path/to/install --enable-foo=shared<br />
$ make install
</code></p></div>
</li>
<li>
<em>ڰ </em> ġ ϰ ġϴ
. <code>mod_foo.c</code> DSO
<code>mod_foo.so</code>:
<div class="example"><p><code>
$ ./configure --add-module=module_type:/path/to/3rdparty/mod_foo.c --enable-foo=shared<br />
$ make install
</code></p></div>
</li>
<li>
<em>߿ ϱ</em> ġ ϴ
:
<div class="example"><p><code>
$ ./configure --enable-so<br />
$ make install
</code></p></div>
</li>
<li>
<em>ڰ </em> ġ ϰ ġϴ
. <a href="programs/apxs.html">apxs</a> Ͽ
ġ ҽ Ʈ <em>ۿ</em> <code>mod_foo.c</code>
DSO <code>mod_foo.so</code>:
<div class="example"><p><code>
$ cd /path/to/3rdparty<br />
$ apxs -c mod_foo.c<br />
$ apxs -i -a -n foo mod_foo.la
</code></p></div>
</li>
</ol>
<p> ϴ ϵǸ, <code>httpd.conf</code>
<code class="directive"><a href="./mod/mod_so.html#loadmodule">LoadModule</a></code> þ
Ͽ ġ о̰ .</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="background" id="background"></a></h2>
<p> н <em>ü</em> (DSO)
ŷ/ε(dynamic linking/loading)̶ Ͽ, Ư
ڵ α
ּҰ о̴ ִ.</p>
<p> ΰ о ִ. ϳ α
Ҷ <code>ld.so</code> ý α ڵ
о̴ , ٸ ϳ α
<code>dlopen()/dlsym()</code> ýȣ н δ(loader)
ý ̽ Ͽ о̴ .</p>
<p>ù° DSO <em>̺귯(shared libraries)</em>
Ȥ <em>DSO ̺귯</em> θ,
<code>libfoo.so</code> <code>libfoo.so.1.2</code>
̸ . ̵ ý 丮( <code>/usr/lib</code>)
ְ, Ͻ Ŀ ɾ <code>-lfoo</code> ־
ϰ Ѵ. ̷ ̺귯 Ͽ
ǿ, α Ҷ Ŀ ɼ <code>-R</code>
, ȯ溯 <code>LD_LIBRARY_PATH</code>
Ȥ <code>/usr/lib</code> н δ
<code>libfoo.so</code> ã ִ. α
( ã(unresolved)) ɺ(symbol) DSO ãԵȴ.</p>
<p>DSO α ɺ ãʱ (DSO
밡 Ϲ ڵ ̺귯̹Ƿ) ã ⼭
. н δ ɺ ã⸦ ϹǷ α
DSO ɺ ã ʿ䰡 . ( <code>ld.so</code>
θ ڵ ƴ α ũǴ
ڵ Ϻδ.) ̺귯 ڵ带 о̴
Ȯϴ. ̺귯 ڵ尡 α ߺؼ
Ǵ <code>libc.so</code> ý ̺귯
ѹ DZ ũ ȴ.</p>
<p>ι° DSO <em>ü(shared objects)</em>
Ȥ <em>DSO </em>̶ θ, (Ģ ̸
<code>foo.so</code>) Ȯڴ Ӵ.
ϵ α ü 丮 ġϰ α
ڵ ʴ´. α
<code>dlopen()</code> Ͽ DSO ּҰ
о鿩 Ѵ. ̶ α DSO ɺ
ã ʴ´. տ н δ ڵ ϰ
̹ о DSO ̺귯(Ư ϴ
<code>libc.so</code> ɺ) DSO ( ã)
ɺ ã´. DSO ġ ó α
ũȰͰ ɺ ˰Եȴ.</p>
<p>DSO API ̿ϱؼ α
<code>dlsym()</code> DSO Ư ɺ ãƼ,
ϱ ġ(dispatch) ǥ <em></em> Ѵ.
ٸ α Ǻ ãƾѴ.
̷ α Ϻθ α
ʿҶ о ʾƵ (
ʰ) ȴٴ ̴. ⺻ α Ȯϱ
ʿ κ о ִ.</p>
<p>̷ DSO ڿ , ּ
Ѱִ. α Ȯϱ DSO Ҷ DSO
α ɺ ã ̴. ? DSO α
ɺ " ã " (̺귯 ڽ ϴ α
ٴ) ̺귯 迡 ϸ, ÷
ʰ ǥȭ ʾұ ̴.
ɺ(global symbol) ͽƮ(export) ʱ
DSO . DSO Ͽ α ȮϷ
Ŀ ɺ ͽƮϵ ϴ ֵ
ذå̴.</p>
<p>̺귯 DSO Ģ ̱
ü ϴ ̺귯 Ѵ.
ݴ α α Ȯϱ ü
ʴ´.</p>
<p>1998 Ȯϱ DSO
Ʈ Ű (XS DynaLoader )
Perl 5, Netscape Server <em></em> 幰. ġ
̹ Ȯϱ ߰ ܺ
ġ ٽɱɿ ϱ ġ
̿ ٹ ߱ 1.3 뿭 շߴ.
ġ о̴µ DSO ϵ
.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="advantages" id="advantages"></a></h2>
<p>տ DSO ϸ ִ:</p>
<ul>
<li> μ Ͻ <code>configure</code>
ɼǴ <code>httpd.conf</code> <code class="directive"><a href="./mod/mod_so.html#loadmodule">LoadModule</a></code> Ͽ ߿
յǹǷ Ű ϴ. ѹ
ġ ġ ٸ (ǥ SSL , ּȭ
߰ [mod_perl, PHP3] <em></em>)
ִ.</li>
<li> ġĿ ڰ Ͽ
Ȯ ִ. ּ Ű ڴ ġ ٽ
Ű PHP3, mod_perl, mod_fastcgi <em></em>
߰ Ű ־ ū ̵̴.</li>
<li>DSO <code>apxs</code> ġ ҽ Ʈ ۿ
۾ϰ <code>apxs -i</code> <code>apachectl restart</code>
ɾ ġ
ݿ ־ ġ
ִ.</li>
</ul>
<p>DSO ִ:</p>
<ul>
<li>α ּҰ ڵ带 о̴
ʴ ü ֱ ÷ DSO
.</li>
<li>н δ ɺ ãƾϱ
20% ʾ.</li>
<li> ġڵ(position independent code, PIC)
ּ(absolute addressing)
ּ(relative addressing)
ʿϹǷ ÷ 5% ʴ.</li>
<li>DSO ٸ DSO ̺귯(<code>ld -lfoo</code>)
ũ ÷ ֱ ( ELF
÷ a.out ÷
ʴ´) DSO .
ٸ DSO Ϸ ϴ ġ ٽɰ ġ
ٽ ϴ C ̺귯(<code>libc</code>) ٸ
/ ̺귯, ġڵ带 ִ ̺귯
ī̺(<code>libfoo.a</code>) ɺ ִ.
ٸ ڵ带 Ϸ ġ ٽ װ ϴ,
<code>dlopen()</code> ڵ带 о鿩 Ѵ.</li>
</ul>
</div></div>
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<p><span> : </span><a href="./en/dso.html" hreflang="en" rel="alternate" title="English"> en </a> |
<a href="./fr/dso.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
<a href="./ja/dso.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="./ko/dso.html" title="Korean"> ko </a> |
<a href="./tr/dso.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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