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<div id="preamble"><h1>ġ mod_unique_id</h1>
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<p><span> : </span><a href="../en/mod/mod_unique_id.html" hreflang="en" rel="alternate" title="English"> en </a> |
<a href="../fr/mod/mod_unique_id.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
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<div class="outofdate"> ֽ ƴմϴ.
ֱٿ ϼ.</div>
<table class="module"><tr><th><a href="module-dict.html#Description">:</a></th><td> û ĺڸ ȯ溯
Ѵ</td></tr>
<tr><th><a href="module-dict.html#Status">:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">:</a></th><td>unique_id_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">ҽ:</a></th><td>mod_unique_id.c</td></tr></table>
<h3></h3>
<p> Ư Ȳ "" û߿
ϵ ĺ(identifier) û Ѵ.
ĺڴ Ưϰ Ŭ ǻ͵
߿ ϴ. û ȯ溯
<code>UNIQUE_ID</code> Ѵ. ĺڴ
뵵 , Ѿ.</p>
</div>
<div id="quickview"><h3></h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#theory">̷</a></li>
</ul><h3 class="directives">þ</h3>
<p> þ ϴ.</p>
<ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="section">
<h2><a name="theory" id="theory">̷</a></h2>
<p> н ýۿ ġ ϴ
캸. Windows NT ʴ´.
н ġ ڽ , ڽ μ
ѹ û óѴ. ڽ ߿ û
óѴ. ⼭ ߿ ڽĵ ڷḦ
ʴ´ٴ ̴. ڽ httpd μ
Ѵ.</p>
<p> ǻͷ Ʈ Ѵٸ Ŭ(cluster)
θ. ǻʹ ġ ִ. ̵ θ
"" , ŬͿ ִ ǻ͵鰣 ž
û ֿ ĺڸ ִ.</p>
<p>ŬͿ ִ ǻʹ 䱸 ؾ Ѵ.
(ǻ Ѵ븸 ϴ ǻ ð NTP ؾ
Ѵ.)</p>
<ul>
<li>ǻ ð NTP ٸ Ʈ ð ݰ
ȭȴ.</li>
<li>ǻ ȣƮ ٸ.
ȣƮ ã ŬͿ ִ ǻ ٸ
IP ּҸ ´.</li>
</ul>
<p>ü pid (μ id) 32Ʈ ٰ
Ѵ. ü pid 32Ʈ ̻ Ѵٸ
ڵ带 ؾ Ѵ.</p>
<p>̷ Ͽ 츮 Ŭ ǻͿ
ִ httpd μ ٸ httpd μ
ִ. ǻ IP ּҿ httpd μ pidε
ִ. û ڸ
ð ȴ.</p>
<p>ð ϱ н ð(timestamp, ǥؽ÷
1970 1 1 ) 16Ʈ ī Ѵ.
н ð ʴ̰, īʹ ʵ 65536
Ѵ. <em>( ip_addr, pid, time_stamp, counter )</em>
httpd μ ʵ 65536 û
ִ. īʹ pid ϴ ذؾ
Ѵ.</p>
<p>httpd ڽ īʹ ( и 10 )
65536 ȴ. ( ý и ð
Ʈ ġʴ .)
ĺڸ 鶧 ϴ ð û
ð̴. īʹ ĺڸ 鶧 Ѵ (
ٽ Ѵ).</p>
<p>Ŀ μ ũҶ(fork) μ pid
Ҵϰ, pid ٽ ִ. (pid н
16Ʈ, ֱ ý 32Ʈ Ȯߴ.) ð
pid ִ. ð pid
ʴ´ٸ ϴ. , 츮 ý
ʵ μ 65536 ̻ ʴ´ٰ Ѵ.
( н 32768 ̻ μ pid
, ̰ Ͼ Ͱ ʴ.)</p>
<p>ð ݺȴٰ غ. , ý
ð谡 ð ŷ ư (Ȥ ð谡 ʹ ռ
ùٷ 缳 ̷ ð Ǵ) .
pid ð ִ. ī ʱȭ
ذϷ ȵǾ. 츮 ڷ
ī ʱȭϱ , ýۿ ̷
. (<em> </em>, seed ʿϱ
rand() , ð ּ ̱
ð seed .) Ϻ ذå .</p>
<p> ? ǻ ϳ û
ʴ ִ 500 (ý Ϲ ϴ
̻ ۾ ϹǷ
̴.) Ѵٰ . ÿ ŭ Ŭ̾Ʈ
óϴ° ڽ ȴ. 츮
ڽ û ʴ 500 ó ִٰ
Ѵ. pid ڽ 500 û ڽ
500 û īͰ ĥ ִ ī ۰
1000̴. (ʴ) ڽ īͰ ݺϿ
ϼ Ȯ 1.5%̴. ̰ ſ ̸,
̷ . ýۿ ̷
ٸ (ҽ Ͽ) ī 32Ʈ
.</p>
<p>ŸӶ ð谡 "ڷ " .
⼭ ϴ ð ǥؽ(UTC), ð
"" Ƿ . x86 н
ʿϴ. κ ð谡 UTC ϵ
ؾ Ѵ. NTP Ѵٸ
UTC ð ùٷ .</p>
<p>ȯ溯 <code>UNIQUE_ID</code> MIME base64 ڵ
112Ʈ (32Ʈ IP ּ, 32Ʈ pid, 32Ʈ
ð, 16Ʈ ī) ĺ <code>[A-Za-z0-9@-]</code>
ǥѴ. MIME base64 ĺ
<code>[A-Za-z0-9+/]</code> <code>+</code>
<code>/</code> URL Ư ǹ̷ ϹǷ ߴ.
Ʈ Ʈ ڵϱ ٸ Ʈ
ϴ Űİ . ڵ
ð, IP ּ, pid, ī ̴.
, α ڵ Ͽ мϸ
ȵ Ѵ. α ڵ <code>UNIQUE_ID</code>
ü ϰ, ٸ <code>UNIQUE_ID</code>
ִ.</p>
<p> <code>UNIQUE_ID</code> ͺ̽
浹 ʰ ڵ ֵ ߴ.
ο ڵ ù ð ϰų, ĺ
Ʈ ̸ ִ. ð ⺻ ϴ ̹Ƿ
ŬͿ ִ ǻͰ û ߴϰ
ڵ ϱ <em> (flag second)</em>
ϴ. û ϰ ο ڵ
ִ.</p>
<p>츮 Ͽ ð
ذå̶ ϴ´. Windows NT Ƽ
ý Ȯ ְ, 뵵 Ȯ
ִ. ̷ ʿѸŭ ĺڸ ֱ
ĺڴ ⺻ . ⺻
Ŭ ǻ͵ ̿ ʿ (ϰ
NTP ⸸ ʿϴ), httpd μ ̿ ŵ ʿ
(Ŀ οϴ pid Ϲ ̴). ſ Ư
Ȳ̶ ν ũ⸦
ؾ Ѵ. ( , Ʈ 32Ʈ IP ּ
ʿϰ ũ, ̸ ̴ Ȳ
ٸ.) </p>
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