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pre
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span.3CharCharCharCharCharChar
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span.1Char
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p.13, li.13, div.13
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p.5Char20, li.5Char20, div.5Char20
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span.3CharChar5
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span.2Char
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{mso-style-name:"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
p.af7, li.af7, div.af7
{mso-style-name:<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
mso-style-link:"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Char";
margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
font-size:10.5pt;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.Char7
{mso-style-name:"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
p.af8, li.af8, div.af8
{mso-style-name:<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
mso-style-link:"<22>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD> Char";
margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
font-size:10.0pt;
font-family:"Times New Roman","serif";}
span.Char8
{mso-style-name:"<22>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD> Char";
mso-style-link:<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-family:"Times New Roman","serif";}
p.af9, li.af9, div.af9
{mso-style-name:<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
mso-style-link:"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Char";
margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
font-size:10.5pt;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.Char9
{mso-style-name:"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
p.58, li.58, div.58
{mso-style-name:ͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С5<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
margin:0cm;
margin-bottom:.0001pt;
font-size:9.0pt;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
p.59, li.59, div.59
{mso-style-name:ͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С5<EFBFBD>ſ<EFBFBD><EFBFBD><EFBFBD>;
margin:0cm;
margin-bottom:.0001pt;
layout-grid-mode:char;
font-size:9.0pt;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
p.926, li.926, div.926
{mso-style-name:"<22><>ʽ <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> + <20><><EFBFBD>\: 9\.26 <20><><EFBFBD><EFBFBD>";
margin:0cm;
margin-bottom:.0001pt;
layout-grid-mode:char;
font-size:10.0pt;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.5Char4
{mso-style-name:"<22><><EFBFBD><EFBFBD> 5 Char";
mso-style-link:"<22><><EFBFBD><EFBFBD> 5";
font-weight:bold;}
span.6Char0
{mso-style-name:"<22><><EFBFBD><EFBFBD> 6 Char";
mso-style-link:"<22><><EFBFBD><EFBFBD> 6";
font-family:"Arial","sans-serif";
font-weight:bold;}
span.7Char
{mso-style-name:"<22><><EFBFBD><EFBFBD> 7 Char";
mso-style-link:"<22><><EFBFBD><EFBFBD> 7";
font-weight:bold;}
span.8Char
{mso-style-name:"<22><><EFBFBD><EFBFBD> 8 Char";
mso-style-link:"<22><><EFBFBD><EFBFBD> 8";
font-family:"Arial","sans-serif";}
span.9Char
{mso-style-name:"<22><><EFBFBD><EFBFBD> 9 Char";
mso-style-link:"<22><><EFBFBD><EFBFBD> 9";
font-family:"Arial","sans-serif";}
span.Chara
{mso-style-name:"<22><>ע<EFBFBD>ı<EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD>ע<EFBFBD>ı<EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.Charb
{mso-style-name:"<22><>ע<EFBFBD><D7A2><EFBFBD><EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD>ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.Charc
{mso-style-name:"ҳü Char";
mso-style-link:ҳü;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.Chard
{mso-style-name:<><D2B3> Char";
mso-style-link:ҳ<EFBFBD><EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.Chare
{mso-style-name:"<22><><EFBFBD><EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.HTMLChar
{mso-style-name:"HTML Ԥ<><D4A4><EFBFBD>ʽ Char\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD> Char\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD>1 Char\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD>2 Char\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD>3 Char";
mso-style-link:"HTML Ԥ<><D4A4><EFBFBD>ʽ\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD>\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD>1\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD>2\,HTML Ԥ<>ȸ<EFBFBD>ʽ<EFBFBD><CABD>3";
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
span.Charf
{mso-style-name:"<22><>ע<EFBFBD><D7A2><EFBFBD><EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD>ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
font-weight:bold;}
span.Charf0
{mso-style-name:"<22><>ע<EFBFBD><D7A2><EFBFBD>ı<EFBFBD> Char";
mso-style-link:<EFBFBD><EFBFBD>ע<EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD>;
font-family:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;}
.MsoChpDefault
{font-size:10.0pt;}
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<div class=WordSection1 style='layout-grid:15.6pt'>
<p class=ab><a name="_Toc53320646"><span style='font-family:<3A><><EFBFBD><EFBFBD>'><EFBFBD><EFBFBD><EFBFBD><EFBFBD></span><span
lang=EN-US>12-13 linux/fs/open.c</span></a></p>
<div class=a align=center style='text-align:center'><span lang=EN-US>
<hr size=4 width="100%" align=center>
</span></div>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>2</span></u> <b><i>&nbsp;*&nbsp;
linux/fs/open.c</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>3</span></u> <b><i>&nbsp;*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>4</span></u> <b><i>&nbsp;*&nbsp;
(C) 1991&nbsp; Linus Torvalds</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>5</span></u> <b><i>&nbsp;*/</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>6</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>7</span></u>
#include &lt;string.h&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD>й<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>8</span></u>
#include &lt;errno.h&gt;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD>и<EFBFBD><EFBFBD>ֳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>9</span></u>
#include &lt;fcntl.h&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŷ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>10</span></u>
#include &lt;sys/types.h&gt;&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͡<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</span></u>
#include &lt;utime.h&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD>û<EFBFBD>ʱ<EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><span
lang=EN-US>utime()</span>ԭ<EFBFBD>͡<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>12</span></u>
#include &lt;sys/stat.h&gt;&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ļ<EFBFBD>״̬ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>״̬<EFBFBD><span
lang=EN-US>stat{}</span><EFBFBD>ͷ<EFBFBD><EFBFBD>ų<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>13</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>14</span></u>
#include &lt;linux/sched.h&gt;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ȳ<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>task_struct</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD>ݵȡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u>
#include &lt;linux/tty.h&gt;&nbsp;&nbsp;&nbsp; // tty</span>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>й<EFBFBD><span
lang=EN-US>tty_io</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD>ŷ<EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u>
#include &lt;linux/kernel.h&gt; // </span><EFBFBD>ں<EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD>ں˳<EFBFBD><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD>ζ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u>
#include &lt;asm/segment.h&gt;&nbsp; // </span><EFBFBD>β<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>йضμĴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>19</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>ȡ<EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>dev</span><EFBFBD>Ǻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѱ<EFBFBD>װ<EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD><span
lang=EN-US>ubuf</span><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><span lang=EN-US>ustat</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ϵͳ<EFBFBD><EFBFBD><EFBFBD>ص<EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѱ<EFBFBD>װ<EFBFBD><EFBFBD><span
lang=EN-US>mounted</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD>ͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ɹ<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>ubuf</span>ָ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ustate</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD>ܿ<EFBFBD><EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϳ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // ustat</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>include/sys/types.h</span><EFBFBD>С<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>20</span></u> int
<u><span style='color:blue'>sys_ustat</span></u>(int dev, struct <u><span
style='color:blue'>ustat</span></u> * ubuf)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOSYS</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܻ<EFBFBD>δʵ<EFBFBD>֡<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>24</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>filename</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>times</span><EFBFBD>Ƿ<EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD><EFBFBD>ṹָ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>times</span>ָ<EFBFBD>벻Ϊ<span
lang=EN-US>NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<span lang=EN-US>utimbuf</span><EFBFBD><EFBFBD>е<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>times</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡϵͳ<EFBFBD><EFBFBD>ǰʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>25</span></u> int
<u><span style='color:blue'>sys_utime</span></u>(char * filename, struct <u><span
style='color:blue'>utimbuf</span></u> * <u><span style='color:blue'>times</span></u>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>26</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>28</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
long actime,modtime;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>29</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>ӡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ö<EFBFBD>Ӧ<span lang=EN-US>i</span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD><EFBFBD>ṹָ<EFBFBD><EFBFBD><span
lang=EN-US>times</span><EFBFBD><EFBFBD>Ϊ<span lang=EN-US>NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӽṹ<EFBFBD>ж<EFBFBD>ȡ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>ʱ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD>ǰʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>30</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(inode=<u><span style='color:blue'>namei</span></u>(filename)))</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>31</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>32</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (<u><span style='color:blue'>times</span></u>) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>33</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
actime = <u><span style='color:blue'>get_fs_long</span></u>((unsigned long *)
&amp;<u><span style='color:blue'>times</span></u>-&gt;actime);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>34</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
modtime = <u><span style='color:blue'>get_fs_long</span></u>((unsigned long *)
&amp;<u><span style='color:blue'>times</span></u>-&gt;modtime);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>35</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
} else</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>36</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
actime = modtime = <u><span style='color:blue'>CURRENT_TIME</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ȼ<EFBFBD><EFBFBD><EFBFBD>޸<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>еķ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>ֶκ<EFBFBD><EFBFBD>޸<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>ֶΡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD>Żظ<EFBFBD><span lang=EN-US>i</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>37</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
inode-&gt;i_atime = actime;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>38</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
inode-&gt;i_mtime = modtime;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>39</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
inode-&gt;i_dirt = 1;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>40</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>41</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return 0;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>42</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>43</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>44</span></u> <b><i>/*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>45</span></u> <b><i>&nbsp;*
XXX should we use the real or effective uid?&nbsp; BSD uses the real uid,</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>46</span></u> <b><i>&nbsp;*
so as to make this call useful to setuid programs.</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>47</span></u> <b><i>&nbsp;*/</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /* </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * XXX </span><EFBFBD><EFBFBD><EFBFBD>Ǹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>û<EFBFBD><span
lang=EN-US>id</span><EFBFBD><EFBFBD><span lang=EN-US>ruid</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>û<EFBFBD><span lang=EN-US>id</span><EFBFBD><EFBFBD><span
lang=EN-US>euid</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>BSD</span>ϵͳʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span><EFBFBD><EFBFBD>ʵ<EFBFBD>û<EFBFBD><span
lang=EN-US>id</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>õ<EFBFBD><EFBFBD>ÿ<EFBFBD><EFBFBD>Թ<EFBFBD><span lang=EN-US>setuid</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span><EFBFBD><EFBFBD>ע<EFBFBD><EFBFBD><span
lang=EN-US>POSIX</span><EFBFBD><EFBFBD>׼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>û<EFBFBD><span lang=EN-US>ID</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span><EFBFBD><EFBFBD>ע<span
lang=EN-US>1</span><EFBFBD><EFBFBD>Ӣ<EFBFBD><EFBFBD>ע<EFBFBD>Ϳ<EFBFBD>ʼ<EFBFBD><EFBFBD> <span lang=EN-US>'XXX' </span><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD>ޡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>filename</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>mode</span><EFBFBD>Ǽ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>ɣ<EFBFBD><span
lang=EN-US>R_OK(</span>ֵ<span lang=EN-US>4)</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // W_OK(2)</span><EFBFBD><EFBFBD><span
lang=EN-US>X_OK(1) </span><EFBFBD><EFBFBD><span lang=EN-US>F_OK(0) </span><EFBFBD><EFBFBD>ɣ<EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>Ƿ<EFBFBD>ɶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>к<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>48</span></u> int
<u><span style='color:blue'>sys_access</span></u>(const char * filename,int
mode)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>49</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>50</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>51</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int res, i_mode;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>52</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ļ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϢҲͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ȡ<EFBFBD>ö<EFBFBD>Ӧ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>mode</span><EFBFBD>ɵ<EFBFBD><span lang=EN-US>3</span>λ<EFBFBD><EFBFBD>ɣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD>ϰ˽<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0007</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>и߱<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㲻<EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD>򷵻<EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD>޳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD>ȡ<span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Żظ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>57</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>iput(inode);</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>61</span><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>53</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mode &amp;= 0007;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>54</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(inode=<u><span style='color:blue'>namei</span></u>(filename)))</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>55</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>EACCES</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޷<EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD>ޡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
i_mode = res = inode-&gt;i_mode &amp; 0777;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>57</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD>Ǹ<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>򣬴<EFBFBD>ʱ<span
lang=EN-US>res</span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˷<EFBFBD><EFBFBD>ʸ<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // [[?? </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<span
lang=EN-US>res &gt;&gt;3 ??]</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>58</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (<u><span style='color:blue'>current</span></u>-&gt;uid == inode-&gt;i_uid)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>59</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
res &gt;&gt;= 6;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>60</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
else if (<u><span style='color:blue'>current</span></u>-&gt;gid ==
inode-&gt;i_gid)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>61</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
res &gt;&gt;= 6;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ʱ<span lang=EN-US>res</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǹ<EFBFBD><EFBFBD>ݵ<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>Ĺ<EFBFBD>ϵѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD>ء<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ծ<EFBFBD><EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<span
lang=EN-US>mode</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>62</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((res &amp; 0007 &amp; mode) == mode)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>63</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return 0;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>64</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<b><i>/*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>65</span></u> <b><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*
XXX we are doing this test last because we really should be</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>66</span></u> <b><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*
swapping the effective with the real user id (temporarily),</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>67</span></u> <b><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*
and then calling suser() routine.&nbsp; If we do call the</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>68</span></u> <b><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*
suser() routine, it needs to be called last. </i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>69</span></u> <b><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
/*</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
* XXX </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD><EFBFBD>ԣ<EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>û<EFBFBD><span lang=EN-US>ID</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
* </span><EFBFBD><EFBFBD>ʵ<EFBFBD>û<EFBFBD><span lang=EN-US>ID</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>أ<EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD>ŵ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>suser()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȷʵҪ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
* suser()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD>ű<EFBFBD><EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*/</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD>û<EFBFBD><span
lang=EN-US>ID</span>Ϊ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>κ<EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>С<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>70</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((!<u><span style='color:blue'>current</span></u>-&gt;uid) &amp;&amp;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>71</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(!(mode &amp; 1) || (i_mode &amp; 0111)))</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>72</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return 0;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>73</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>EACCES</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޷<EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD>ޡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>74</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>75</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD>ı䵱ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>filename</span><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>76</span></u> int
<u><span style='color:blue'>sys_chdir</span></u>(const char * filename)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>77</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>78</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>79</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ı䵱ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ѽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD>ֶ<EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㡣</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡĿ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㲻<EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // i</span><EFBFBD>ڵ㲻<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Ŀ¼<span
lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD>Żظ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>80</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(inode = <u><span style='color:blue'>namei</span></u>(filename)))</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>81</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOENT</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>82</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!<u><span style='color:blue'>S_ISDIR</span></u>(inode-&gt;i_mode)) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>83</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>84</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOTDIR</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>85</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ȼ<EFBFBD><EFBFBD><EFBFBD>ͷŽ<EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<span
lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õĹ<EFBFBD><EFBFBD><EFBFBD>Ŀ¼<span lang=EN-US>i</span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>86</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>-&gt;pwd);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>87</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>current</span></u>-&gt;pwd = inode;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>88</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return (0);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>89</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>90</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD>ı<EFBFBD><EFBFBD>Ŀ¼ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ó<EFBFBD>Ϊ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>̵ĸ<EFBFBD>Ŀ¼<span
lang=EN-US>'/'</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>91</span></u> int
<u><span style='color:blue'>sys_chroot</span></u>(const char * filename)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>92</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>93</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>94</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڸı䵱ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еĸ<EFBFBD>Ŀ¼<EFBFBD>ֶ<EFBFBD><span
lang=EN-US>root</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㡣</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㲻<EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㲻<EFBFBD><EFBFBD>Ŀ¼<span
lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD>Żظ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // i</span><EFBFBD>ڵ㣬Ҳ<EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>95</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(inode=<u><span style='color:blue'>namei</span></u>(filename)))</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>96</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>97</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!<u><span style='color:blue'>S_ISDIR</span></u>(inode-&gt;i_mode)) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>98</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>99</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOTDIR</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ȼ<EFBFBD><EFBFBD><EFBFBD>ͷŵ<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>̵ĸ<EFBFBD>Ŀ¼<span
lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>-&gt;root);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>current</span></u>-&gt;root = inode;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return (0);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD>޸<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>filename</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>mode</span><EFBFBD><EFBFBD><EFBFBD>µ<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
lang=EN-US> int <u><span style='color:blue'>sys_chmod</span></u>(const char *
filename,int mode)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
lang=EN-US> {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>m_inode</span></u> * inode;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>µķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>mode</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㲻<EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>̵<EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>û<EFBFBD><span
lang=EN-US>id</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><span lang=EN-US>id</span><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD>dz<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Żظ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ļ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><EFBFBD><EFBFBD><EFBFBD>루û<EFBFBD>з<EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD>ޣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!(inode=<u><span
style='color:blue'>namei</span></u>(filename)))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if ((<u><span
style='color:blue'>current</span></u>-&gt;euid != inode-&gt;i_uid) &amp;&amp; !<u><span
style='color:blue'>suser</span></u>()) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>EACCES</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ø<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ø<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD>Żظ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_mode =
(mode &amp; 07777) | (inode-&gt;i_mode &amp; ~07777);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_dirt =
1;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return 0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD>޸<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>filename</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>uid</span><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD>ʶ<EFBFBD><EFBFBD><span lang=EN-US>(</span><EFBFBD>û<EFBFBD><span lang=EN-US>ID)</span><EFBFBD><EFBFBD><span
lang=EN-US>gid</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ID</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
lang=EN-US> int <u><span style='color:blue'>sys_chown</span></u>(const char *
filename,int uid,int gid)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
lang=EN-US> {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
lang=EN-US> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;struct <u><span
style='color:blue'>m_inode</span></u> * inode;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>е<EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ID</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫȡ<EFBFBD>ø<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㲻<EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>̲<EFBFBD><EFBFBD>dz<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>Żظ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><EFBFBD><EFBFBD><EFBFBD>루û<EFBFBD>з<EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD>ޣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!(inode=<u><span
style='color:blue'>namei</span></u>(filename)))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!<u><span
style='color:blue'>suser</span></u>()) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>EACCES</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǿ<EFBFBD><EFBFBD>ò<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><span lang=EN-US>ID</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ID</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>Ѿ<EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>Żظ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
inode-&gt;i_uid=uid;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
inode-&gt;i_gid=gid;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_dirt=1;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return 0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͡<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>sys_open()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򿪵<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>tty</span><EFBFBD>ն<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>Ե<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>̵<EFBFBD><EFBFBD><EFBFBD><EFBFBD>úͶ<EFBFBD><span
lang=EN-US>tty</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>-1</span><EFBFBD><EFBFBD>ʾʧ<EFBFBD>ܣ<EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܴ򿪡<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
lang=EN-US> static int <u><span style='color:blue'>check_char_dev</span></u>(struct
<u><span style='color:blue'>m_inode</span></u> * inode, int dev, int flag)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
lang=EN-US> {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>tty_struct</span></u> *tty;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int min;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//
</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>4</span><EFBFBD><EFBFBD><span lang=EN-US>/dev/ttyxx</span><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>5</span><EFBFBD><EFBFBD><span
lang=EN-US>/dev/tty</span><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>/dev/tty</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD>նˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǽ<EFBFBD><EFBFBD>̿<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ն<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>/dev/tty</span><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD>ʹ<EFBFBD>õ<EFBFBD><span
lang=EN-US>/dev/ttyxx</span><EFBFBD>豸֮һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>նˣ<EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><span
lang=EN-US>tty</span><EFBFBD>ֶν<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>4</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ijһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򿪲<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD> <span
lang=EN-US>/dev/tty</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>MAJOR(dev) = 5</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>min = </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>е<EFBFBD><span lang=EN-US>tty</span><EFBFBD>ֶΣ<EFBFBD><EFBFBD><EFBFBD>ȡ<span
lang=EN-US>4</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򿪵<EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><span lang=EN-US>4</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>š<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US> 4</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD>նˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŵ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD><span lang=EN-US>
-1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD>ڽ<EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD>նˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>߲<EFBFBD><EFBFBD>ܴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (<u><span
style='color:blue'>MAJOR</span></u>(dev) == 4 || <u><span style='color:blue'>MAJOR</span></u>(dev)
== 5) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (<u><span style='color:blue'>MAJOR</span></u>(dev) == 5)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
min = <u><span style='color:blue'>current</span></u>-&gt;tty;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
else</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
min = <u><span style='color:blue'>MINOR</span></u>(dev);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (min &lt; 0)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -1;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>α<EFBFBD>ն<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ֻ<EFBFBD>ܱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>̶<EFBFBD>ռʹ<EFBFBD>á<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ű<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>α<EFBFBD>նˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҹô<EFBFBD><EFBFBD>ļ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // i </span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US> 1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>á<EFBFBD><EFBFBD><EFBFBD>˲<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٴ򿪸<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>
-1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>tty</span><EFBFBD>ṹָ<EFBFBD><EFBFBD><span lang=EN-US>tty</span>ָ<EFBFBD><EFBFBD><span
lang=EN-US>tty</span><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>־<span lang=EN-US>flag</span><EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ն˱<EFBFBD>־<span
lang=EN-US>O_NOCTTY</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҵ<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>նˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>tty</span><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>session</span><EFBFBD>ֶ<EFBFBD>Ϊ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD>ն˻<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>κν<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>նˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ն<EFBFBD><EFBFBD><span
lang=EN-US>min </span>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>նˡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ý<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ն<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // tty</span>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>min</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ö<EFBFBD>Ӧ<span lang=EN-US>tty</span><EFBFBD><EFBFBD>ĻỰ<EFBFBD><EFBFBD><span lang=EN-US>session</span><EFBFBD>ͽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>pgrp</span><EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD>ڽ<EFBFBD><EFBFBD>̵Ļ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>źͽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((<u><span style='color:blue'>IS_A_PTY_MASTER</span></u>(min)) &amp;&amp;
(inode-&gt;i_count&gt;1))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -1;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
tty = <u><span style='color:blue'>TTY_TABLE</span></u>(min);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(flag &amp; <u><span style='color:blue'>O_NOCTTY</span></u>) &amp;&amp;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>current</span></u>-&gt;leader &amp;&amp;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>current</span></u>-&gt;tty&lt;0 &amp;&amp;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
tty-&gt;session==0) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>current</span></u>-&gt;tty = min;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
tty-&gt;session= <u><span style='color:blue'>current</span></u>-&gt;session;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
tty-&gt;pgrp = <u><span style='color:blue'>current</span></u>-&gt;pgrp;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־<span
lang=EN-US>flag</span><EFBFBD>к<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>O_NONBLOCK</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>Ը<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD>ն<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ó<EFBFBD>ʱ<EFBFBD><EFBFBD>ʱֵΪ<span lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ն<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>óɷǹ淶ģʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽֻ<EFBFBD>ܹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڷǹ淶ģʽ<EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>ģʽ<EFBFBD>µ<EFBFBD><span
lang=EN-US>VMIN</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>VTIME</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>0</span>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̾Ͷ<EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̷<EFBFBD><EFBFBD>ء<EFBFBD><EFBFBD>μ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // include/termios.h</span><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (flag &amp; <u><span style='color:blue'>O_NONBLOCK</span></u>) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>TTY_TABLE</span></u>(min)-&gt;<u><span
style='color:blue'>termios</span></u>.c_cc[<u><span style='color:blue'>VMIN</span></u>]
=0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>TTY_TABLE</span></u>(min)-&gt;<u><span
style='color:blue'>termios</span></u>.c_cc[<u><span style='color:blue'>VTIME</span></u>]
=0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>TTY_TABLE</span></u>(min)-&gt;<u><span
style='color:blue'>termios</span></u>.c_lflag &amp;= ~ICANON;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return 0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD>򿪣<EFBFBD><EFBFBD>򴴽<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>filename</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>flag</span><EFBFBD>Ǵ<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡֵ<EFBFBD><EFBFBD><span lang=EN-US>O_RDONLY</span><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>O_WRONLY</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ֻд<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>O_RDWR</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><span
lang=EN-US>O_CREAT</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>O_EXCL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // O_APPEND</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>β<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD><EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // mode</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>S_IRWXU</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD>Ȩ<EFBFBD>ޣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // S_IRUSR</span><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>ļ<EFBFBD>Ȩ<EFBFBD>ޣ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>S_IRWXG</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD>Ȩ<EFBFBD>ޣ<EFBFBD><EFBFBD>ȵȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻӦ<EFBFBD><EFBFBD><EFBFBD>ڽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD>ʣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>Ĵ򿪵<EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ɶ<EFBFBD>д<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ò<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>(</span><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>)</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>μ<EFBFBD><span lang=EN-US>sys/stat.h</span><EFBFBD><EFBFBD><span
lang=EN-US>fcntl.h</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
lang=EN-US> int <u><span style='color:blue'>sys_open</span></u>(const char *
filename,int flag,int mode)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
lang=EN-US> {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>m_inode</span></u> * inode;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>file</span></u> * f;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int i,fd;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ȶԲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD><EFBFBD>ļ<EFBFBD>ģʽ<EFBFBD>ͽ<EFBFBD><EFBFBD><EFBFBD>ģʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɵ<EFBFBD><EFBFBD>ļ<EFBFBD>ģʽ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ϊ<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̽ṹ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ṹָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Բ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>fd</span><EFBFBD><EFBFBD><EFBFBD>Ǿ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD>û<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mode &amp;= 0777
&amp; ~current-&gt;<u><span style='color:blue'>umask</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for(fd=0 ; fd&lt;<u><span
style='color:blue'>NR_OPEN</span></u> ; fd++)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!<u><span style='color:blue'>current</span></u>-&gt;filp[fd])&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD>ҵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (fd&gt;=<u><span
style='color:blue'>NR_OPEN</span></u>)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>̵<EFBFBD>ִ<EFBFBD><EFBFBD>ʱ<EFBFBD>ر<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>close_on_exec</span><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>Ӧ<EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // close_on_exec </span><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD>־<EFBFBD><EFBFBD>ÿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <span
lang=EN-US>execve()</span>ʱ<EFBFBD><EFBFBD>Ҫ<EFBFBD>رյ<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> <span lang=EN-US>fork()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ӽ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڸ<EFBFBD><EFBFBD>ӽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>execve()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>³<EFBFBD><EFBFBD>򡣴<EFBFBD>ʱ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ӽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>п<EFBFBD>ʼִ<EFBFBD><EFBFBD><EFBFBD>³<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>close_on_exec</span><EFBFBD>еĶ<EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><span lang=EN-US>execve()</span>ʱ<EFBFBD>ö<EFBFBD>Ӧ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>رգ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD>մ<EFBFBD><EFBFBD>ڴ<EFBFBD>״̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>һ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ʱ<EFBFBD><EFBFBD>Ĭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>״̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ȼ<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѱ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>нṹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>f</span>ָ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD>û<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>184</span><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD>ָ<EFBFBD>븳ֵ
<span lang=EN-US>&quot;0+file_table &quot; </span><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD> <span lang=EN-US>&quot;file_table&quot;
</span><EFBFBD><EFBFBD> <span lang=EN-US>&quot;&amp;file_table[0]&quot;</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD>ܸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>current</span></u>-&gt;close_on_exec &amp;= ~(1&lt;&lt;fd);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; f=0+<u><span
style='color:blue'>file_table</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for (i=0 ; i&lt;<u><span
style='color:blue'>NR_FILE</span></u> ; i++,f++)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!f-&gt;f_count) break;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (i&gt;=<u><span
style='color:blue'>NR_FILE</span></u>)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ý<EFBFBD><EFBFBD>̶<EFBFBD>Ӧ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>fd</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ṹָ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>open_namei()</span>ִ<EFBFBD>д򿪲<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵС<EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>򿪲<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>inode</span><EFBFBD><EFBFBD><EFBFBD>Ѵ<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ָ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (<u><span
style='color:blue'>current</span></u>-&gt;filp[fd]=f)-&gt;f_count++;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if ((i=<u><span
style='color:blue'>open_namei</span></u>(filename,flag,mode,&amp;inode))&lt;0)
{</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>current</span></u>-&gt;filp[fd]=<u><span
style='color:blue'>NULL</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
f-&gt;f_count=0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return i;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѵ<EFBFBD><EFBFBD>ļ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶΣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD><EFBFBD><EFBFBD>֪<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͡<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD>͵<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>һЩ<EFBFBD>ر<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>򿪵<EFBFBD><F2BFAAB5><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><C3B4><EFBFBD>Ǿ<EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><span
lang=EN-US>check_char_dev()</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>鵱ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD>ܴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // check_char_dev()</span><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>ݾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>򿪱<EFBFBD>־Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>նˡ<EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ʹ<EFBFBD>ø<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>;<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
lang=EN-US> <b><i>/* ttys are somewhat special (ttyxx major==4, tty major==5)
*/</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /* ttys</span><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>ttyxx</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>==4</span><EFBFBD><EFBFBD><span lang=EN-US>tty</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>==5</span><EFBFBD><EFBFBD><span lang=EN-US>*/</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (<u><span
style='color:blue'>S_ISCHR</span></u>(inode-&gt;i_mode))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (<u><span style='color:blue'>check_char_dev</span></u>(inode,inode-&gt;i_zone[0],flag))
{</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>current</span></u>-&gt;filp[fd]=<u><span
style='color:blue'>NULL</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
f-&gt;f_count=0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return
-<u><span style='color:blue'>EAGAIN</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ţ<EFBFBD><EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򿪵<EFBFBD><EFBFBD>ǿ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƭ<EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>ø<EFBFBD><EFBFBD>ٻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>и<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʧЧ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
lang=EN-US> <b><i>/* Likewise with block-devices: check for floppy_change */</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /* </span>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڿ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƭ<EFBFBD>Ƿ񱻸<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US> */</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (<u><span
style='color:blue'>S_ISBLK</span></u>(inode-&gt;i_mode))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>check_disk_change</span></u>(inode-&gt;i_zone[0]);</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>dz<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ժͱ<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD>þ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>ֶ<EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>дָ<EFBFBD><EFBFBD>Ϊ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>󷵻<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; f-&gt;f_mode =
inode-&gt;i_mode;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; f-&gt;f_flags =
flag;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; f-&gt;f_count = 1;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; f-&gt;f_inode =
inode;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; f-&gt;f_pos = 0;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return (fd);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>213</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>pathname</span><EFBFBD><EFBFBD>·<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>mode</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>sys_open()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
lang=EN-US> int <u><span style='color:blue'>sys_creat</span></u>(const char *
pathname, int mode)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
lang=EN-US> {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return <u><span
style='color:blue'>sys_open</span></u>(pathname, <u><span style='color:blue'>O_CREAT</span></u>
| <u><span style='color:blue'>O_TRUNC</span></u>, mode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ر<EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>fd</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
lang=EN-US> int <u><span style='color:blue'>sys_close</span></u>(unsigned int
fd)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
lang=EN-US> {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></p>
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>file</span></u> * filp;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ԡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>ڳ<EFBFBD><EFBFBD><EFBFBD>ͬʱ<EFBFBD>ܴ򿪵<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>NR_OPEN</span><EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD>̵<EFBFBD>ִ<EFBFBD><EFBFBD>ʱ<EFBFBD>ر<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD>Ӧλ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ṹָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>NULL</span><EFBFBD><EFBFBD><EFBFBD>򷵻س<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (fd &gt;= <u><span
style='color:blue'>NR_OPEN</span></u>)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>current</span></u>-&gt;close_on_exec &amp;= ~(1&lt;&lt;fd);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!(filp = <u><span
style='color:blue'>current</span></u>-&gt;filp[fd]))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
lang=EN-US> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return
-<u><span style='color:blue'>EINVAL</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ø<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>ṹָ<EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڹر<EFBFBD><EFBFBD>ļ<EFBFBD>֮ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>еľ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD>Ϊ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD>ں˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򽫶<EFBFBD>Ӧ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>Ϊ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>ø<EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѵ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>Ѿ<EFBFBD>û<EFBFBD>н<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>ѱ<EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>С<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷŸ<EFBFBD><EFBFBD>ļ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>current</span></u>-&gt;filp[fd] = <u><span style='color:
blue'>NULL</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if
(filp-&gt;f_count == 0)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>panic</span></u>(<i>&quot;Close: file count is
0&quot;</i>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if
(--filp-&gt;f_count)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return (0);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>iput</span></u>(filp-&gt;f_inode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return (0);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>236</span></u><span
lang=EN-US> </span></p>
<div class=a align=center style='text-align:center'><span lang=EN-US>
<hr size=4 width="100%" align=center>
</span></div>
<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>
</div>
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