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[apache] / docs / manual / dso.xml.ko

<?xml version="1.0" encoding="EUC-KR" ?>
<!DOCTYPE manualpage SYSTEM "./style/manualpage.dtd">
<?xml-stylesheet type="text/xsl" href="./style/manual.ko.xsl"?>
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<manualpage metafile="dso.xml.meta">

  <title>µ¿Àû°øÀ¯°´Ã¼ (DSO) Áö¿ø</title>

  <summary>
    <p>¾ÆÆÄÄ¡ À¥¼­¹ö´Â °ü¸®ÀÚ°¡ ¸ðµâµéÀ» ¼±ÅÃÇÏ¿© ¼­¹ö¿¡ Æ÷ÇÔÇÒ
    ±â´ÉÀ» °áÁ¤ÇÒ ¼ö ÀÖ´Â ¸ðµâÈ­µÈ ÇÁ·Î±×·¥ÀÌ´Ù. ¼­¹ö¸¦ ÄÄÆÄÇÒ¶§
    <code>httpd</code> ½ÇÇàÆÄÀÏ¿¡ Á¤ÀûÀ¸·Î ¸ðµâÀ» ÄÄÆÄÀÏÇÒ
    ¼ö ÀÖ´Ù. ¾Æ´Ï¸é ¸ðµâÀ» <code>httpd</code> ½ÇÇàÆÄÀÏ°ú
    ºÐ¸®ÇÏ¿© µ¿Àû°øÀ¯°´Ã¼(Dynamic Shared Objects, DSO)·Î ÄÄÆÄÀÏÇÒ
    ¼ö ÀÖ´Ù. DSO ¸ðµâÀº ¼­¹ö¸¦ ÄÄÆÄÀÏÇÒ¶§ ÄÄÆÄÀÏÇϰųª, Apache
    Extension Tool (<a href="programs/apxs.html">apxs</a>)À»
    »ç¿ëÇÏ¿© ³ªÁß¿¡ ÄÄÆÄÀÏÇÏ¿© Ãß°¡ÇÒ ¼ö ÀÖ´Ù.</p>

    <p>ÀÌ ¹®¼­´Â DSO ¸ðµâ »ç¿ë¹ý°ú ¹è°æ ÀÌ·ÐÀ» ¼³¸íÇÑ´Ù.</p>
  </summary>


<section id="implementation"><title>±¸Çö</title>

<related>
<modulelist>
<module>mod_so</module>
</modulelist>
<directivelist>
<directive module="mod_so">LoadModule</directive>
</directivelist>
</related>

    <p>¾ÆÆÄÄ¡ Çٽɿ¡ Á¤ÀûÀ¸·Î ÄÄÆÄÀÏÇؾßÇÒ
    <module>mod_so.c</module>¶ó´Â ¸ðµâÀº ¾ÆÆÄÄ¡ ¸ðµâÀ»
    ÀоîµéÀ̱âÀ§ÇÑ DSO¸¦ Áö¿øÇÑ´Ù.
    ÀÌ ¸ðµâÀº <module>core</module>¸¦ Á¦¿ÜÇÏ°í DSO°¡
    µÉ ¼ö ¾ø´Â À¯ÀÏÇÑ ¸ðµâÀÌ´Ù. ½ÇÁ¦·Î ´Ù¸¥ ¸ðµç ¾ÆÆÄÄ¡ ¸ðµâÀº
    <a href="install.html">¼³Ä¡ ¹®¼­</a>¿¡¼­ ¼³¸íÇÑ
    <code>configure</code>ÀÇ <code>--enable-<em>module</em>=shared</code>
    ¿É¼ÇÀ» »ç¿ëÇÏ¿© DSO·Î ÄÄÆÄÀÏÇÒ ¼ö ÀÖ´Ù. ¸ðµâÀ»
    <code>mod_foo.so</code>¿Í °°ÀÌ DSO·Î ÄÄÆÄÀÏÇÑÈÄ <code>httpd.conf</code>
    ÆÄÀÏ¿¡ <module>mod_so</module>ÀÇ
    <directive module="mod_so">LoadModule</directive> ¸í·É¾î¸¦
    »ç¿ëÇÏ¿© ¼­¹ö ½ÃÀ۽à ȤÀº Àç½ÃÀ۽à ±× ¸ðµâÀ» ÀоîµéÀÏ ¼ö
    ÀÖ´Ù.</p>

    <p>¾ÆÆÄÄ¡ ¸ðµâ(ƯÈ÷ Á¦»ïÀÚ°¡ ¸¸µç ¸ðµâ)·Î »ç¿ëÇÒ DSO ÆÄÀÏÀ» ½±°Ô
    ¸¸µé±âÀ§ÇØ <a href="programs/apxs.html">apxs</a> (<em>APache
    eXtenSion</em>)¶ó´Â »õ·Î¿î Áö¿ø ÇÁ·Î±×·¥ÀÌ ÀÖ´Ù. ÀÌ ÇÁ·Î±×·¥Àº
    ¾ÆÆÄÄ¡ ¼Ò½º Æ®¸® <em>¹Û¿¡¼­</em> DSO·Î »ç¿ëÇÒ ¸ðµâÀ»
    ÄÄÆÄÀÏÇÒ¶§ »ç¿ëÇÑ´Ù. °³³äÀº ½±´Ù. ¾ÆÆÄÄ¡¸¦ ¼³Ä¡ÇÒ¶§
    <code>configure</code>¿Í <code>make install</code>ÀÌ
    ¾ÆÆÄÄ¡ C Çì´õÆÄÀÏÀ» ¼³Ä¡ÇÏ°í, DSO ÆÄÀÏÀ» ÄÄÆÄÀÏÇϱâÀ§ÇÑ
    Ç÷¡Æû ƯÀ¯ÀÇ ÄÄÆÄÀÏ·¯ ¿É¼Ç°ú ¸µÄ¿ ¿É¼ÇÀ» <code>apxs</code>
    ÇÁ·Î±×·¥¿¡ ±â·ÏÇÑ´Ù. ±×·¡¼­ <code>apxs</code>¸¦ »ç¿ëÇÏ´Â »ç¿ëÀÚ´Â
    ¾ÆÆÄÄ¡ ¹èÆ÷º» ¼Ò½º Æ®¸®¾øÀÌ, ¶Ç DSO Áö¿øÀ» À§ÇÑ Ç÷¡Æû ƯÀ¯ÀÇ
    ÄÄÆÄÀÏ·¯ ¿É¼Ç¿Í ¸µÄ¿ ¿É¼Ç¿¡ ½Å°æÀ» ¾²Áö¾Ê°í ÀÚ½ÅÀÇ ¾ÆÆÄÄ¡
    ¸ðµâ ¼Ò½º¸¦ ÄÄÆÄÀÏÇÒ ¼ö ÀÖ´Ù.</p>
</section>

<section id="usage"><title>»ç¿ë¹ý ¿ä¾à</title>

    <p>Apache 2.2ÀÇ DSO ±â´É¿¡ ´ëÇÑ Âª°í °£·«ÇÑ ¿ä¾àÀÌ´Ù:</p>

    <ol>
      <li>
        <em>¹èÆ÷º»¿¡ ÀÖ´Â</em> ¾ÆÆÄÄ¡ ¸ðµâÀ» ÄÄÆÄÀÏÇÏ°í ¼³Ä¡ÇÏ´Â
        °æ¿ì. ¿¹¸¦ µé¾î <code>mod_foo.c</code>¸¦ DSO
        <code>mod_foo.so</code>·Î:

<example>
$ ./configure --prefix=/path/to/install --enable-foo=shared<br />
$ make install
</example>
      </li>

      <li>
        <em>Á¦»ïÀÚ°¡ ¸¸µç</em> ¾ÆÆÄÄ¡ ¸ðµâÀ» ÄÄÆÄÀÏÇÏ°í ¼³Ä¡ÇÏ´Â
        °æ¿ì. ¿¹¸¦ µé¾î <code>mod_foo.c</code>¸¦ DSO
        <code>mod_foo.so</code>·Î:

<example>
$ ./configure --add-module=module_type:/path/to/3rdparty/mod_foo.c --enable-foo=shared<br />
$ make install
</example>
      </li>

      <li>
        °øÀ¯ ¸ðµâÀ» <em>³ªÁß¿¡ »ç¿ëÇϱâÀ§ÇØ</em> ¾ÆÆÄÄ¡¸¦ ±¸¼ºÇÏ´Â
        °æ¿ì:

<example>
$ ./configure --enable-so<br />
$ make install
</example>
      </li>

      <li>
        <em>Á¦»ïÀÚ°¡ ¸¸µç</em> ¾ÆÆÄÄ¡ ¸ðµâÀ» ÄÄÆÄÀÏÇÏ°í ¼³Ä¡ÇÏ´Â
        °æ¿ì. <a href="programs/apxs.html">apxs</a>¸¦ »ç¿ëÇÏ¿©
        ¾ÆÆÄÄ¡ ¼Ò½º Æ®¸® <em>¹Û¿¡¼­</em> <code>mod_foo.c</code>¸¦
        DSO <code>mod_foo.so</code>·Î:

<example>
$ cd /path/to/3rdparty<br />
$ apxs -c mod_foo.c<br />
$ apxs -i -a -n foo mod_foo.la
</example>
      </li>
    </ol>

    <p>¸ðµç °æ¿ì ÀÏ´Ü °øÀ¯ ¸ðµâÀÌ ÄÄÆÄÀϵǸé, <code>httpd.conf</code>¿¡
    <directive module="mod_so">LoadModule</directive> Áö½Ã¾î¸¦
    »ç¿ëÇÏ¿© ¾ÆÆÄÄ¡°¡ ±× ¸ðµâÀ» ÀоîµéÀÌ°Ô ¸¸µç´Ù.</p>
</section>

<section id="background"><title>¹è°æÁö½Ä</title>

    <p>Çö´ëÀûÀÎ À¯´Ð½º·ù¿¡´Â <em>µ¿Àû°øÀ¯°´Ã¼</em> (DSO)ÀÇ
    µ¿Àû ¸µÅ·/·Îµù(dynamic linking/loading)À̶ó°í ÇÏ¿©, Ưº°ÇÑ
    Çü½ÄÀÇ ½ÇÇàÄÚµå Á¶°¢À» ¸¸µé¾î ½ÇÇàÁßÀÎ ½ÇÇàÇÁ·Î±×·¥ÀÇ
    ÁÖ¼Ò°ø°£¿¡ ÀоîµéÀÌ´Â ¸ÚÁø ±â´ÉÀÌ ÀÖ´Ù.</p>

    <p>º¸Åë µÎ°¡Áö ¹æ¹ýÀ¸·Î ÀоîµéÀÏ ¼ö ÀÖ´Ù. Çϳª´Â ½ÇÇàÇÁ·Î±×·¥ÀÌ
    ½ÃÀÛÇÒ¶§ <code>ld.so</code>¶ó´Â ½Ã½ºÅÛ ÇÁ·Î±×·¥ÀÌ ÀÚµ¿À¸·Î
    ÀоîµéÀÌ´Â °æ¿ì°í, ´Ù¸¥ Çϳª´Â ½ÇÇàÁßÀÎ ÇÁ·Î±×·¥ÀÌ
    <code>dlopen()/dlsym()</code> ½Ã½ºÅÛÈ£Ãâ·Î À¯´Ð½º ·Î´õ(loader)ÀÇ
    ½Ã½ºÅÛ ÀÎÅÍÆäÀ̽ºÀ» »ç¿ëÇÏ¿© Á÷Á¢ ÀоîµéÀÌ´Â °æ¿ì´Ù.</p>

    <p>ù¹ø° °æ¿ì DSO¸¦ º¸Åë <em>°øÀ¯¶óÀ̺귯¸®(shared libraries)</em>
    ȤÀº <em>DSO ¶óÀ̺귯¸®</em>¶ó°í ºÎ¸£¸ç, ÆÄÀÏÀº
    <code>libfoo.so</code>³ª <code>libfoo.so.1.2</code> °°Àº
    À̸§À» °¡Áø´Ù. À̵éÀº ½Ã½ºÅÛ µð·ºÅ丮(º¸Åë <code>/usr/lib</code>)¿¡
    ÀÖ°í, ÄÄÆÄÀϽà ¸µÄ¿ ¸í·É¾î¿¡ <code>-lfoo</code>¸¦ ÁÖ¾î
    ½ÇÇàÆÄÀÏ°ú ¿¬°áÇÑ´Ù. ÀÌ·¸°Ô Á÷Á¢ ½áÁØ ¶óÀ̺귯¸®´Â ½ÇÇàÆÄÀÏ¿¡
    ÂüÁ¶µÇ¿©¼­, ÇÁ·Î±×·¥ÀÌ ½ÃÀÛÇÒ¶§ ¸µÄ¿ ¿É¼Ç <code>-R</code>·Î
    Á÷Á¢ ÁöÁ¤ÇÑ °æ·Î, ȯ°æº¯¼ö <code>LD_LIBRARY_PATH</code>·Î
    ÁöÁ¤ÇÑ °æ·Î ȤÀº <code>/usr/lib</code>¿¡¼­ À¯´Ð½º ·Î´õ°¡
    <code>libfoo.so</code>¸¦ ãÀ» ¼ö ÀÖ´Ù. ±×·¯¸é ½ÇÇàÇÁ·Î±×·¥ÀÇ
    (¾ÆÁ÷ ¸øãÀº(unresolved)) ½Éº¼(symbol)À» DSO¿¡¼­ ã°ÔµÈ´Ù.</p>

    <p>DSO´Â º¸Åë ½ÇÇàÇÁ·Î±×·¥ÀÇ ½Éº¼À» ãÁö¾Ê±â ¶§¹®¿¡ (DSO°¡
    Àç»ç¿ë°¡´ÉÇÑ ÀϹÝÀûÀÎ ÄÚµå ¶óÀ̺귯¸®À̹ǷÎ) ã±â´Â ¿©±â¼­
    ³¡³­´Ù. À¯´Ð½º ·Î´õ°¡ ½Éº¼ ã±â¸¦ ¿ÏÀüÈ÷ ´ã´çÇϹǷΠ½ÇÇàÇÁ·Î±×·¥ÀÌ
    Á÷Á¢ DSO¿¡¼­ ½Éº¼À» ãÀ» ÇÊ¿ä°¡ ¾ø´Ù. (»ç½Ç <code>ld.so</code>¸¦
    ºÎ¸£´Â ÄÚµå´Â Á¤ÀûÀÌ ¾Æ´Ñ ¸ðµç ½ÇÇàÇÁ·Î±×·¥¿¡ ¸µÅ©µÇ´Â ½ÇÇà½Ã
    ½ÃÀÛÄÚµåÀÇ ÀϺδÙ.) °øÅëµÈ ¶óÀ̺귯¸® Äڵ带 µ¿ÀûÀ¸·Î ÀоîµéÀÌ´Â
    ÀåÁ¡Àº ¸íÈ®ÇÏ´Ù. ¶óÀ̺귯¸® Äڵ尡 ¸ðµç ÇÁ·Î±×·¥¿¡ Áߺ¹Çؼ­
    ÀúÀåµÇ´Â ´ë½Å <code>libc.so</code>¿Í °°Àº ½Ã½ºÅÛ ¶óÀ̺귯¸®¿¡
    Çѹø¸¸ ÀúÀåµÇ±â ¶§¹®¿¡ µð½ºÅ© °ø°£ÀÌ Àý¾àµÈ´Ù.</p>

    <p>µÎ¹ø° °æ¿ì DSO¸¦ º¸Åë <em>°øÀ¯°´Ã¼(shared objects)</em>
    ȤÀº <em>DSO ÆÄÀÏ</em>À̶ó°í ºÎ¸£°í, (±ÔÄ¢»ó À̸§Àº
    <code>foo.so</code>ÀÌÁö¸¸) ÆÄÀÏÀÇ È®ÀåÀÚ´Â ÀÚÀ¯·Ó´Ù. ÀÌ
    ÆÄÀϵéÀº º¸Åë ÇÁ·Î±×·¥ ÀÚü µð·ºÅ丮¿¡ À§Ä¡ÇÏ°í ½ÇÇàÇÁ·Î±×·¥¿¡
    ÀÚµ¿À¸·Î ¿¬°áµÇÁö ¾Ê´Â´Ù. ´ë½Å ½ÇÇàÇÁ·Î±×·¥Àº ½ÇÇà½Ã
    <code>dlopen()</code>À» »ç¿ëÇÏ¿© DSO¸¦ ÁÖ¼Ò°ø°£¿¡
    Á÷Á¢ Àоîµé¿©¾ß ÇÑ´Ù. À̶§ ½ÇÇàÇÁ·Î±×·¥Àº DSO¿¡¼­ ½Éº¼À»
    ãÁö ¾Ê´Â´Ù. ´ë½Å ¾Õ¿¡¼­ º» À¯´Ð½º ·Î´õ´Â ÀÚµ¿À¸·Î ½ÇÇàÆÄÀÏ°ú
    ½ÇÇàÆÄÀÏÀÌ ÀÌ¹Ì ÀоîµéÀÎ DSO ¶óÀ̺귯¸®(ƯÈ÷ Ç×»ó Á¸ÀçÇÏ´Â
    <code>libc.so</code>ÀÇ ¸ðµç ½Éº¼)¿¡¼­ DSOÀÇ (¾ÆÁ÷ ¸øãÀº)
    ½Éº¼À» ã´Â´Ù. ±×·¡¼­ DSO´Â ¸¶Ä¡ óÀ½ºÎÅÍ ½ÇÇàÇÁ·Î±×·¥¿¡
    Á¤ÀûÀ¸·Î ¸µÅ©µÈ°Í°ú °°ÀÌ ½ÇÇàÆÄÀÏÀÇ ½Éº¼À» ¾Ë°ÔµÈ´Ù.</p>

    <p>DSOÀÇ API¸¦ ÀÌ¿ëÇϱâÀ§Çؼ­ ¸¶Áö¸·À¸·Î ½ÇÇàÇÁ·Î±×·¥Àº
    <code>dlsym()</code>À¸·Î DSO¿¡¼­ ƯÁ¤ ½Éº¼À» ã¾Æ¼­, ¾ÕÀ¸·Î
    »ç¿ëÇϱâÀ§ÇØ µð½ºÆÐÄ¡(dispatch) Ç¥ <em>µî</em>¿¡ ÀúÀåÇÑ´Ù.
    ´Ù¸¥ ¸»·Î ½ÇÇàÇÁ·Î±×·¥Àº »ç¿ëÇÒ ¸ðµç ½Çº¼À» Á÷Á¢ ã¾Æ¾ßÇÑ´Ù.
    ÀÌ·± ±¸Á¶ÀÇ ÀåÁ¡Àº ÇÁ·Î±×·¥ÀÇ ÀϺθ¦ ÇÁ·Î±×·¥ÀÌ
    ÇÊ¿äÇÒ¶§±îÁö ÀоîµéÀÌÁö ¾Ê¾Æµµ (±×·¡¼­ ¸Þ¸ð¸®¸¦ ³¶ºñÇÏÁö
    ¾Ê°Ô) µÈ´Ù´Â Á¡ÀÌ´Ù. ±âº» ÇÁ·Î±×·¥ÀÇ ±â´ÉÀ» È®ÀåÇϱâÀ§ÇØ
    ÇÊ¿äÇÑ °æ¿ì ÀÌ ºÎºÐÀ» µ¿ÀûÀ¸·Î ÀоîµéÀÏ ¼ö ÀÖ´Ù.</p>

    <p>ÀÌ·± DSO ±¸Á¶°¡ ÀÚ¿¬½º·´°Ô º¸ÀÌÁö¸¸, ÃÖ¼ÒÇÑ ¾î·Á¿î Á¡ÀÌ
    ÇÑ°¡ÁöÀÖ´Ù. ÇÁ·Î±×·¥À» È®ÀåÇϱâÀ§ÇØ DSO¸¦ »ç¿ëÇÒ¶§ DSO°¡
    ½ÇÇàÇÁ·Î±×·¥ÀÇ ½Éº¼À» ã´Â ÀÏÀÌ´Ù. ¿Ö? DSO°¡ ½ÇÇàÇÁ·Î±×·¥ÀÇ
    ½Éº¼À» "¿ªÀ¸·Î ã´Â °Í"Àº (¶óÀ̺귯¸®´Â ÀÚ½ÅÀ» »ç¿ëÇÏ´Â ÇÁ·Î±×·¥¿¡
    ´ëÇØ ¸ð¸¥´Ù´Â) ¶óÀ̺귯¸® ¼³°è¿¡ ¹ÝÇϸç, ¸ðµç Ç÷¡Æû¿¡¼­
    Áö¿øµÇÁö¾Ê°í Ç¥ÁØÈ­µÇÁöµµ ¾Ê¾Ò±â ¶§¹®ÀÌ´Ù. ½ÇÁ¦·Î ½ÇÇàÆÄÀÏÀÇ
    Àü¿ª½Éº¼(global symbol)Àº º¸Åë ÀͽºÆ÷Æ®(export)µÇÁö ¾Ê±â¶§¹®¿¡
    DSO°¡ »ç¿ëÇÒ ¼ö ¾ø´Ù. DSO¸¦ »ç¿ëÇÏ¿© ½ÇÇàÁß ÇÁ·Î±×·¥À» È®ÀåÇÏ·Á¸é
    ¸µÄ¿¿¡°Ô ¸ðµç Àü¿ª½Éº¼À» ÀͽºÆ÷Æ®Çϵµ·Ï °­Á¦ÇÏ´Â °ÍÀÌ ÁÖµÈ
    ÇØ°áÃ¥ÀÌ´Ù.</p>

    <p>°øÀ¯¶óÀ̺귯¸®´Â DSO ¹æ½ÄÀÇ ¼³°è¿øÄ¢´ë·Î ÀüÇüÀûÀ̱⶧¹®¿¡
    ¿î¿µÃ¼Á¦°¡ Á¦°øÇÏ´Â °ÅÀÇ ¸ðµç Á¾·ùÀÇ ¶óÀ̺귯¸®°¡ »ç¿ëÇÑ´Ù.
    ¹Ý´ë·Î ¸¹Àº ÇÁ·Î±×·¥Àº ÇÁ·Î±×·¥À» È®ÀåÇϱâÀ§ÇØ °øÀ¯°´Ã¼¸¦
    »ç¿ëÇÏÁö ¾Ê´Â´Ù.</p>

    <p>1998³â ½ÇÇàÁß ½ÇÁ¦·Î ±â´ÉÀ» È®ÀåÇϱâÀ§ÇØ DSO ±¸Á¶¸¦ »ç¿ëÇÑ
    ¼ÒÇÁÆ®¿þ¾î ÆÐÅ°Áö´Â (XS ±¸Á¶¿Í DynaLoader ¸ðµâÀ» »ç¿ëÇÑ)
    Perl 5, Netscape Server <em>µî</em>À¸·Î µå¹°¾ú´Ù. ¾ÆÆÄÄ¡´Â
    ÀÌ¹Ì ±â´ÉÀ» È®ÀåÇϱâÀ§ÇØ ¸ðµâ °³³äÀ» »ç¿ëÇß°í ¿ÜºÎ ¸ðµâÀ»
    ¾ÆÆÄÄ¡ Çٽɱâ´É¿¡ ¿¬°áÇϱâÀ§ÇØ ³»ºÎÀûÀ¸·Î µð½ºÆÐÄ¡¸ñ·ÏÀ»
    ÀÌ¿ëÇÑ Á¢±Ù¹æ¹ýÀ» »ç¿ëÇ߱⶧¹®¿¡ 1.3 ¹öÀüºÎÅÍ ÀÌ ´ë¿­¿¡ ÇÕ·ùÇß´Ù.
    ±×·¡¼­ ¾ÆÆÄÄ¡´Â ½ÇÇàÁß ¸ðµâÀ» ÀоîµéÀ̴µ¥ DSO¸¦ »ç¿ëÇϵµ·Ï
    ¿î¸íÁö¿öÁ³´Ù.</p>
</section>

<section id="advantages"><title>Àå´ÜÁ¡</title>

    <p>¾Õ¿¡¼­ ¸»ÇÑ DSO¸¦ »ç¿ëÇÏ¸é ´ÙÀ½°ú °°Àº ÀåÁ¡ÀÌ ÀÖ´Ù:</p>

    <ul>
      <li>½ÇÁ¦ ¼­¹ö ÇÁ·Î¼¼½º°¡ ÄÄÆÄÀϽà <code>configure</code>
      ¿É¼Ç´ë½Å <code>httpd.conf</code>ÀÇ <directive
      module="mod_so">LoadModule</directive>À» »ç¿ëÇÏ¿© ½ÇÇàÁß¿¡
      °áÇյǹǷΠ¼­¹ö ÆÐÅ°Áö ½ÇÇàÀÌ ´õ À¯¿¬ÇÏ´Ù. ¿¹¸¦ µé¾î ÇѹøÀÇ
      ¾ÆÆÄÄ¡ ¼³Ä¡¸¸À¸·Î ´Ù¸¥ ¼­¹ö(Ç¥ÁØ ¹öÀü°ú SSL ¹öÀü, ÃÖ¼ÒÈ­
      ¹öÀü°ú ±â´ÉÃß°¡ ¹öÀü [mod_perl, PHP3] <em>µî</em>)¸¦ ½ÇÇàÇÒ
      ¼ö ÀÖ´Ù.</li>

      <li>¼­¹ö´Â ¼³Ä¡ÈÄ¿¡µµ Á¦»ïÀÚ°¡ ¸¸µç ¸ðµâÀ» »ç¿ëÇÏ¿© ½±°Ô
      È®ÀåÇÒ ¼ö ÀÖ´Ù. ÃÖ¼ÒÇÑ ±â¾÷ÀÇ ÆÐÅ°Áö Á¦ÀÛÀÚ´Â ¾ÆÆÄÄ¡ ÇÙ½É
      ÆÐÅ°Áö¿Í º°µµ·Î PHP3, mod_perl, mod_fastcgi <em>µî</em>À»
      Ãß°¡ ÆÐÅ°Áö·Î ¸¸µé ¼ö À־ Å« À̵æÀÌ´Ù.</li>

      <li>DSO¿Í <code>apxs</code>¸¦ °¡Áö°í ¾ÆÆÄÄ¡ ¼Ò½º Æ®¸® ¹Û¿¡¼­
      ÀÛ¾÷ÇÏ°í <code>apxs -i</code>¿Í <code>apachectl restart</code>
      ¸í·É¾î¸¸À¸·Î ÇöÀç °³¹ßÇÑ ¸ðµâÀÇ »õ ¹öÀüÀ» ½ÇÇàÁßÀÎ ¾ÆÆÄÄ¡
      ¼­¹ö¿¡ ¹Ý¿µÇÒ ¼ö À־ ´õ ½±°Ô ¾ÆÆÄÄ¡ ¸ðµâÀ» °³¹ßÇÒ ¼ö
      ÀÖ´Ù.</li>
    </ul>

    <p>DSO´Â ´ÙÀ½°ú °°Àº ´ÜÁ¡ÀÌ ÀÖ´Ù:</p>

    <ul>
      <li>ÇÁ·Î±×·¥ÀÇ ÁÖ¼Ò°ø°£¿¡ Äڵ带 µ¿ÀûÀ¸·Î ÀоîµéÀÌ´Â ±â´ÉÀ»
      Áö¿øÇÏÁö¾Ê´Â ¿î¿µÃ¼Á¦°¡ Àֱ⠶§¹®¿¡ ¸ðµç Ç÷¡Æû¿¡¼­ DSO¸¦
      »ç¿ëÇÒ ¼ö ¾ø´Ù.</li>

      <li>À¯´Ð½º ·Î´õ°¡ ½Éº¼À» ã¾Æ¾ßÇϱ⠶§¹®¿¡ ¼­¹ö ½ÃÀÛÀÌ
      ¾à 20% Á¤µµ ´Ê¾îÁø´Ù.</li>

      <li>¼­¹ö´Â À§Ä¡µ¶¸³ÄÚµå(position independent code, PIC)
      ¶§¹®¿¡ Àý´ëÁÖ¼ÒÁöÁ¤(absolute addressing)º¸´Ù ´À¸°
      »ó´ëÁÖ¼ÒÁöÁ¤(relative addressing)ÀÇ º¹ÀâÇÑ ¾î¼Àºí·¯ ±â¹ýÀÌ
      ÇÊ¿äÇϹǷΠ¾î¶² Ç÷¡Æû¿¡¼­ ½ÇÇà½Ã ¾à 5% Á¤µµ ´Ê´Ù.</li>

      <li>DSO ¸ðµâÀ» ´Ù¸¥ DSO±â¹Ý ¶óÀ̺귯¸®(<code>ld -lfoo</code>)¿¡
      ¸µÅ©ÇÒ ¼ö ¾ø´Â Ç÷¡ÆûÀÌ Àֱ⶧¹®¿¡ (¿¹¸¦ µé¾î ELF±â¹Ý
      Ç÷¡ÆûÀº Áö¿øÇÏÁö¸¸ a.out±â¹Ý Ç÷¡ÆûÀº º¸Åë ÀÌ ±â´ÉÀ»
      Áö¿øÇÏÁö ¾Ê´Â´Ù) ¸ðµç Á¾·ùÀÇ ¸ðµâ¿¡ DSO¸¦ »ç¿ëÇÒ ¼ö ¾ø´Ù.
      ´Ù¸¥ ¸»·Î DSO ÆÄÀÏ·Î ÄÄÆÄÀÏÇÏ´Â ¸ðµâÀº ¾ÆÆÄÄ¡ Çٽɰú ¾ÆÆÄÄ¡
      ÇÙ½ÉÀÌ »ç¿ëÇÏ´Â C ¶óÀ̺귯¸®(<code>libc</code>)¿Í ´Ù¸¥
      µ¿Àû/Á¤Àû ¶óÀ̺귯¸®, À§Ä¡µ¶¸³Äڵ带 ´ã°í ÀÖ´Â Á¤Àû ¶óÀ̺귯¸®
      ¾ÆÄ«À̺ê(<code>libfoo.a</code>)ÀÇ ½Éº¼¸¸À» »ç¿ëÇÒ ¼ö ÀÖ´Ù.
      ´Ù¸¥ Äڵ带 »ç¿ëÇÏ·Á¸é ¾ÆÆÄÄ¡ ÇÙ½ÉÀÌ ±×°ÍÀ» ÂüÁ¶ÇÏ´øÁö,
      <code>dlopen()</code>À¸·Î Á÷Á¢ Äڵ带 Àоîµé¿©¾ß ÇÑ´Ù.</li>
    </ul>

</section>

</manualpage>