3078 lines
113 KiB
HTML
3078 lines
113 KiB
HTML
<html>
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<head>
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<meta http-equiv=Content-Type content="text/html; charset=gb2312">
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p
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pre
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tt
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p.1, li.1, div.1
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|
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|
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|
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|
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|
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|
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|
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|
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|
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{mso-style-name:ListTitle;
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{mso-style-name:FigureTitle;
|
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|
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{mso-style-name:表中文字小五;
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{mso-style-name:关键词;
|
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|
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|
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|
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|
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{mso-style-name:"关键词 Char";
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|
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{mso-style-name:文件名;
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|
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|
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{mso-style-name:"文件名 Char";
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|
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{mso-style-name:选项;
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span.Char5
|
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{mso-style-name:"选项 Char";
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{mso-style-name:命令行;
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span.Char6
|
||
{mso-style-name:"命令行 Char";
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{mso-style-name:函数名;
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|
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|
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|
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span.Char7
|
||
{mso-style-name:"函数名 Char";
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|
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|
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|
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{mso-style-name:寄存器名;
|
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|
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|
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|
||
{mso-style-name:"寄存器名 Char";
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mso-style-link:寄存器名;
|
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|
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{mso-style-name:变量名;
|
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|
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|
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|
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|
||
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|
||
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|
||
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|
||
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|
||
{mso-style-name:"变量名 Char";
|
||
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|
||
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|
||
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|
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{mso-style-name:图中文字小5号左;
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|
||
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|
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|
||
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|
||
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|
||
{mso-style-name:图中文字小5号靠左;
|
||
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|
||
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|
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|
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|
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|
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|
||
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|
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|
||
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|
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|
||
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|
||
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|
||
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|
||
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|
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|
||
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|
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|
||
{mso-style-name:"标题 6 Char";
|
||
mso-style-link:"标题 6";
|
||
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|
||
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|
||
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|
||
{mso-style-name:"标题 7 Char";
|
||
mso-style-link:"标题 7";
|
||
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|
||
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|
||
{mso-style-name:"标题 8 Char";
|
||
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|
||
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|
||
span.9Char
|
||
{mso-style-name:"标题 9 Char";
|
||
mso-style-link:"标题 9";
|
||
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|
||
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|
||
{mso-style-name:"脚注文本 Char";
|
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mso-style-link:脚注文本;
|
||
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|
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span.Charb
|
||
{mso-style-name:"批注文字 Char";
|
||
mso-style-link:批注文字;
|
||
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|
||
span.Charc
|
||
{mso-style-name:"页眉 Char";
|
||
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|
||
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|
||
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|
||
{mso-style-name:"页脚 Char";
|
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mso-style-link:页脚;
|
||
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|
||
span.Chare
|
||
{mso-style-name:"日期 Char";
|
||
mso-style-link:日期;
|
||
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|
||
span.HTMLChar
|
||
{mso-style-name:"HTML 预设格式 Char\,HTML 预先格式化 Char\,HTML 预先格式化1 Char\,HTML 预先格式化2 Char\,HTML 预先格式化3 Char";
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||
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|
||
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|
||
{mso-style-name:"批注主题 Char";
|
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|
||
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|
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|
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|
||
{mso-style-name:"批注框文本 Char";
|
||
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|
||
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|
||
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|
||
{font-size:10.0pt;}
|
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/* Page Definitions */
|
||
@page WordSection1
|
||
{size:595.3pt 841.9pt;
|
||
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|
||
layout-grid:15.6pt;}
|
||
div.WordSection1
|
||
{page:WordSection1;}
|
||
/* List Definitions */
|
||
ol
|
||
{margin-bottom:0cm;}
|
||
ul
|
||
{margin-bottom:0cm;}
|
||
-->
|
||
</style>
|
||
|
||
</head>
|
||
|
||
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
|
||
|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320646"><span style='font-family:黑体'>程序</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> <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>2</span></u> <b><i> *
|
||
linux/fs/open.c</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u> <b><i> *
|
||
(C) 1991 Linus Torvalds</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u>
|
||
#include <string.h> // </span>字符串头文件。主要定义了一些有关字符串操作的嵌入函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u>
|
||
#include <errno.h> // </span>错误号头文件。包含系统中各种出错号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u>
|
||
#include <fcntl.h> // </span>文件控制头文件。用于文件及其描述符操作控制常数符号定义。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u>
|
||
#include <sys/types.h> // </span>类型头文件。定义基本的系统和文件系统统计信息结构和类型。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</span></u>
|
||
#include <utime.h> // </span>用户时间头文件。定义访问和修改时间结构以及<span
|
||
lang=EN-US>utime()</span>原型。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>12</span></u>
|
||
#include <sys/stat.h> // </span>文件状态头文件。含有文件状态结构<span
|
||
lang=EN-US>stat{}</span>和符号常量等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u>
|
||
#include <linux/sched.h> // </span>调度程序头文件，定义任务结构<span lang=EN-US>task_struct</span>、任务<span
|
||
lang=EN-US>0</span>数据等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u>
|
||
#include <linux/tty.h> // tty</span>头文件，定义了有关<span
|
||
lang=EN-US>tty_io</span>，串行通信方面的参数、常数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u>
|
||
#include <linux/kernel.h> // </span>内核头文件。含有一些内核常用函数的原形定义。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u>
|
||
#include <asm/segment.h> // </span>段操作头文件。定义了有关段寄存器操作的嵌入式汇编函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>取文件系统信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>dev</span>是含有已安装文件系统的设备号。<span
|
||
lang=EN-US>ubuf</span>是一个<span lang=EN-US>ustat</span>结构缓冲区指针，用于存放</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>系统返回的文件系统信息。该系统调用用于返回已安装（<span
|
||
lang=EN-US>mounted</span>）文件系统的统计信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>成功时返回<span lang=EN-US>0</span>，并且<span
|
||
lang=EN-US>ubuf</span>指向的<span lang=EN-US>ustate</span>结构被添入文件系统总空闲块数和空闲<span
|
||
lang=EN-US>i</span>节点数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // ustat</span>结构定义在<span
|
||
lang=EN-US>include/sys/types.h</span>中。</p>
|
||
|
||
<p class=a><span lang=EN-US> <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> <u><span style='color:blue'>21</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u>
|
||
return -<u><span style='color:blue'>ENOSYS</span></u>;
|
||
// </span>出错码：功能还未实现。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>设置文件访问和修改时间。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>filename</span>是文件名，<span
|
||
lang=EN-US>times</span>是访问和修改时间结构指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>times</span>指针不为<span
|
||
lang=EN-US>NULL</span>，则取<span lang=EN-US>utimbuf</span>结构中的时间信息来设置文件的访问和修改时间。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>times</span>指针是<span
|
||
lang=EN-US>NULL</span>，则取系统当前时间来设置指定文件的访问和修改时间域。</p>
|
||
|
||
<p class=a><span lang=EN-US> <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> <u><span style='color:blue'>26</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u>
|
||
long actime,modtime;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件的时间信息保存在其<span
|
||
lang=EN-US>i</span>节点钟。因此我们首先根据文件名取得对应<span lang=EN-US>i</span>节点。如果没有找</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>到，则返回出错码。如果提供的访问和修改时间结构指针<span
|
||
lang=EN-US>times</span>不为<span lang=EN-US>NULL</span>，则从结构中读取</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用户设置的时间值。否则就用系统当前时间来设置文件的访问和修改时间。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u>
|
||
if (!(inode=<u><span style='color:blue'>namei</span></u>(filename)))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u>
|
||
return -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
if (<u><span style='color:blue'>times</span></u>) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
actime = <u><span style='color:blue'>get_fs_long</span></u>((unsigned long *)
|
||
&<u><span style='color:blue'>times</span></u>->actime);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
modtime = <u><span style='color:blue'>get_fs_long</span></u>((unsigned long *)
|
||
&<u><span style='color:blue'>times</span></u>->modtime);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
} else</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u>
|
||
actime = modtime = <u><span style='color:blue'>CURRENT_TIME</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后修改<span lang=EN-US>i</span>节点中的访问时间字段和修改时间字段。再设置<span
|
||
lang=EN-US>i</span>节点已修改标志，放回该<span lang=EN-US>i</span>节</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>点，并返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u>
|
||
inode->i_atime = actime;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u>
|
||
inode->i_mtime = modtime;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u>
|
||
inode->i_dirt = 1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u>
|
||
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u> <b><i> *
|
||
XXX should we use the real or effective uid? BSD uses the real uid,</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u> <b><i> *
|
||
so as to make this call useful to setuid programs.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span></p>
|
||
|
||
<p class=a><span lang=EN-US> * XXX </span>我们该用真实用户<span
|
||
lang=EN-US>id</span>（<span lang=EN-US>ruid</span>）还是有效用户<span lang=EN-US>id</span>（<span
|
||
lang=EN-US>euid</span>）？<span lang=EN-US>BSD</span>系统使用了</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>真实用户<span
|
||
lang=EN-US>id</span>，以使该调用可以供<span lang=EN-US>setuid</span>程序使用。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>（注：<span
|
||
lang=EN-US>POSIX</span>标准建议使用真实用户<span lang=EN-US>ID</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>（注<span
|
||
lang=EN-US>1</span>：英文注释开始的 <span lang=EN-US>'XXX' </span>表示重要提示）。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>检查文件的访问权限。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>filename</span>是文件名，<span
|
||
lang=EN-US>mode</span>是检查的访问属性，它有<span lang=EN-US>3</span>个有效比特位组成：<span
|
||
lang=EN-US>R_OK(</span>值<span lang=EN-US>4)</span>、</p>
|
||
|
||
<p class=a><span lang=EN-US> // W_OK(2)</span>、<span
|
||
lang=EN-US>X_OK(1) </span>和<span lang=EN-US>F_OK(0) </span>组成，分别表示检测文件是否可读、可写、可执行和文件是</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否存在。如果访问允许的话，则返回<span
|
||
lang=EN-US>0</span>，否则返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <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> <u><span style='color:blue'>49</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
int res, i_mode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件的访问权限信息也同样保存在文件的<span
|
||
lang=EN-US>i</span>节点结构中，因此我们要先取得对应文件名的<span lang=EN-US>i</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>节点。检测的访问属性<span
|
||
lang=EN-US>mode</span>由低<span lang=EN-US>3</span>位组成，因此需要与上八进制<span lang=EN-US>0007</span>来清除所有高比特位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果文件名对应的<span
|
||
lang=EN-US>i</span>节点不存在，则返回没有许可权限出错码。若<span lang=EN-US>i</span>节点存在，则取<span
|
||
lang=EN-US>i</span>节点</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>钟文件属性码，并放回该<span
|
||
lang=EN-US>i</span>节点。另外，<span lang=EN-US>57</span>行上语句“<span lang=EN-US>iput(inode);</span>”最后放在<span
|
||
lang=EN-US>61</span>行之后。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u>
|
||
mode &= 0007;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
if (!(inode=<u><span style='color:blue'>namei</span></u>(filename)))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
return -<u><span style='color:blue'>EACCES</span></u>;
|
||
// </span>出错码：无访问权限。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u>
|
||
i_mode = res = inode->i_mode & 0777;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u>
|
||
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前进程用户是该文件的宿主，则取文件宿主属性。否则如果当前进程用户与该文件宿</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>主同属一组，则取文件组属性。否则，此时<span
|
||
lang=EN-US>res</span>最低<span lang=EN-US>3</span>比特是其他人访问该文件的许可属性。</p>
|
||
|
||
<p class=a><span lang=EN-US> // [[?? </span>这里应<span
|
||
lang=EN-US>res >>3 ??]</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
if (<u><span style='color:blue'>current</span></u>->uid == inode->i_uid)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u>
|
||
res >>= 6;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
else if (<u><span style='color:blue'>current</span></u>->gid ==
|
||
inode->i_gid)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
res >>= 6;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>此时<span lang=EN-US>res</span>的最低<span
|
||
lang=EN-US>3</span>比特是根据当前进程用户与文件的关系选择出来的访问属性位。现在我们</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>来判断这<span lang=EN-US>3</span>比特。如果文件属性具有参数所查询的属性位<span
|
||
lang=EN-US>mode</span>，则访问许可，返回<span lang=EN-US>0</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u>
|
||
if ((res & 0007 & mode) == mode)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
<b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u> <b><i> *
|
||
XXX we are doing this test last because we really should be</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u> <b><i> *
|
||
swapping the effective with the real user id (temporarily),</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> <b><i> *
|
||
and then calling suser() routine. If we do call the</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u> <b><i> *
|
||
suser() routine, it needs to be called last. </i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/*</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* XXX </span>我们最后才做下面的测试，因为我们实际上需要交换有效用户<span lang=EN-US>ID</span>和</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>真实用户<span lang=EN-US>ID</span>（临时地），然后才调用<span lang=EN-US>suser()</span>函数。如果我们确实要调用</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* suser()</span>函数，则需要最后才被调用。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前用户<span
|
||
lang=EN-US>ID</span>为<span lang=EN-US>0</span>（超级用户）并且屏蔽码执行位是<span lang=EN-US>0</span>或者文件可以被任何人执行、搜</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>索，则返回<span lang=EN-US>0</span>。否则返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u>
|
||
if ((!<u><span style='color:blue'>current</span></u>->uid) &&</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u>
|
||
(!(mode & 1) || (i_mode & 0111)))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u>
|
||
return -<u><span style='color:blue'>EACCES</span></u>;
|
||
// </span>出错码：无访问权限。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>改变当前工作目录系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>filename</span>是目录名。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>操作成功则返回<span
|
||
lang=EN-US>0</span>，否则返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <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> <u><span style='color:blue'>77</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>改变当前工作目录就是要求把进程任务结构的当前工作目录字段指向给定目录名的<span
|
||
lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>因此我们首先取目录名的<span
|
||
lang=EN-US>i</span>节点。如果目录名对应的<span lang=EN-US>i</span>节点不存在，则返回出错码。如果该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点不是一个目录<span
|
||
lang=EN-US>i</span>节点，则放回该<span lang=EN-US>i</span>节点，并返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
if (!(inode = <u><span style='color:blue'>namei</span></u>(filename)))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
return -<u><span style='color:blue'>ENOENT</span></u>;
|
||
// </span>出错码：文件或目录不存在。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
if (!<u><span style='color:blue'>S_ISDIR</span></u>(inode->i_mode)) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
return -<u><span style='color:blue'>ENOTDIR</span></u>;
|
||
// </span>出错码：不是目录名。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后释放进程原工作目录<span
|
||
lang=EN-US>i</span>节点，并使其指向新设置的工作目录<span lang=EN-US>i</span>节点。返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
<u><span style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->pwd);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
<u><span style='color:blue'>current</span></u>->pwd = inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
return (0);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>改变根目录系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>把指定的目录名设置成为当前进程的根目录<span
|
||
lang=EN-US>'/'</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果操作成功则返回<span
|
||
lang=EN-US>0</span>，否则返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <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> <u><span style='color:blue'>92</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该调用用于改变当前进程任务结构中的根目录字段<span
|
||
lang=EN-US>root</span>，让其指向参数给定目录名的<span lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果目录名对应的<span
|
||
lang=EN-US>i</span>节点不存在，则返回出错码。如果该<span lang=EN-US>i</span>节点不是目录<span
|
||
lang=EN-US>i</span>节点，则放回该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点，也返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
if (!(inode=<u><span style='color:blue'>namei</span></u>(filename)))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
return -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
if (!<u><span style='color:blue'>S_ISDIR</span></u>(inode->i_mode)) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
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> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后释放当前进程的根目录<span
|
||
lang=EN-US>i</span>节点，并重新设置为指定目录名的<span lang=EN-US>i</span>节点，返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->root);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->root = inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US> 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> //// </span>修改文件属性系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>filename</span>是文件名，<span
|
||
lang=EN-US>mode</span>是新的文件属性。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若操作成功则返回<span
|
||
lang=EN-US>0</span>，否则返回出错码。</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> 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> // </span>该调用为指定文件设置新的访问属性<span
|
||
lang=EN-US>mode</span>。文件的访问属性在文件名对应的<span lang=EN-US>i</span>节点中，因此</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>我们首先取文件名对应的<span
|
||
lang=EN-US>i</span>节点。如果<span lang=EN-US>i</span>节点不存在，则返回出错码（文件或目录不存在）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前进程的有效用户<span
|
||
lang=EN-US>id</span>与文件<span lang=EN-US>i</span>节点的用户<span lang=EN-US>id</span>不同，并且也不是超级用户，则放回该</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件<span lang=EN-US>i</span>节点，返回出错码（没有访问权限）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US> 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>
|
||
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> if ((<u><span
|
||
style='color:blue'>current</span></u>->euid != inode->i_uid) && !<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>
|
||
<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>
|
||
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> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则就重新设置该<span
|
||
lang=EN-US>i</span>节点的文件属性，并置该<span lang=EN-US>i</span>节点已修改标志。放回该<span
|
||
lang=EN-US>i</span>节点，返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US> inode->i_mode =
|
||
(mode & 07777) | (inode->i_mode & ~07777);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US> inode->i_dirt =
|
||
1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US> <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> 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> //// </span>修改文件宿主系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>filename</span>是文件名，<span
|
||
lang=EN-US>uid</span>是用户标识符<span lang=EN-US>(</span>用户<span lang=EN-US>ID)</span>，<span
|
||
lang=EN-US>gid</span>是组<span lang=EN-US>ID</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若操作成功则返回<span
|
||
lang=EN-US>0</span>，否则返回出错码。</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> 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> // </span>该调用用于设置文件<span
|
||
lang=EN-US>i</span>节点中的用户和组<span lang=EN-US>ID</span>，因此首先要取得给定文件名的<span
|
||
lang=EN-US>i</span>节点。如果文</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>件名的<span lang=EN-US>i</span>节点不存在，则返回出错码（文件或目录不存在）。如果当前进程不是超级用户，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则放回该<span lang=EN-US>i</span>节点，并返回出错码（没有访问权限）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US> 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>
|
||
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> 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>
|
||
<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>
|
||
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> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则我们就用参数提供的值来设置文件<span
|
||
lang=EN-US>i</span>节点的用户<span lang=EN-US>ID</span>和组<span lang=EN-US>ID</span>，并置<span
|
||
lang=EN-US>i</span>节点已经修改标志，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>放回该<span lang=EN-US>i</span>节点，返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US>
|
||
inode->i_uid=uid;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US>
|
||
inode->i_gid=gid;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> inode->i_dirt=1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US> <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> 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> //// </span>检查字符设备类型。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数仅用于下面文件打开系统调用<span
|
||
lang=EN-US>sys_open()</span>，用于检查若打开的文件是<span lang=EN-US>tty</span>终端字符设</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>备时，需要对当前进程的设置和对<span
|
||
lang=EN-US>tty</span>表的设置。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回<span lang=EN-US>0</span>检测处理成功，返回<span
|
||
lang=EN-US>-1</span>表示失败，对应字符设备不能打开。</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> 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> int min;
|
||
//
|
||
</span>子设备号。</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> // </span>只处理主设备号是<span
|
||
lang=EN-US>4</span>（<span lang=EN-US>/dev/ttyxx</span>文件）或<span lang=EN-US>5</span>（<span
|
||
lang=EN-US>/dev/tty</span>文件）的情况。<span lang=EN-US>/dev/tty</span>的子设备</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号是<span lang=EN-US>0</span>。如果一个进程有控制终端，则它是进程控制终端设备的同义名。即<span
|
||
lang=EN-US>/dev/tty</span>设备是</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一个虚拟设备，它对应到进程实际使用的<span
|
||
lang=EN-US>/dev/ttyxx</span>设备之一。对于一个进程来说，若其有</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>控制终端，那么它的任务结构中的<span
|
||
lang=EN-US>tty</span>字段将是<span lang=EN-US>4</span>号设备的某一个子设备号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果打开操作的文件是 <span
|
||
lang=EN-US>/dev/tty</span>（即<span lang=EN-US>MAJOR(dev) = 5</span>），那么我们令<span
|
||
lang=EN-US>min = </span>进程任务结构</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>中的<span lang=EN-US>tty</span>字段，即取<span
|
||
lang=EN-US>4</span>号设备的子设备号。否则如果打开的是某个<span lang=EN-US>4</span>号设备，则直接取其子</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设备号。如果得到的<span
|
||
lang=EN-US> 4</span>号设备子设备号小于<span lang=EN-US>0</span>，那么说明进程没有控制终端，或者设备号错</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>误，则返回<span lang=EN-US>
|
||
-1</span>，表示由于进程没有控制终端，或者不能打开这个设备。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> 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>
|
||
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>
|
||
min = <u><span style='color:blue'>current</span></u>->tty;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US>
|
||
else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US>
|
||
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>
|
||
if (min < 0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US>
|
||
return -1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>主伪终端设备文件只能被进程独占使用。如果子设备号表明是一个主伪终端，并且该打开文件</p>
|
||
|
||
<p class=a><span lang=EN-US> // i </span>节点引用计数大于<span
|
||
lang=EN-US> 1</span>，则说明该设备已被其他进程使用。因此不能再打开该字符设备文件，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>于是返回<span lang=EN-US>
|
||
-1</span>。否则，我们让<span lang=EN-US>tty</span>结构指针<span lang=EN-US>tty</span>指向<span
|
||
lang=EN-US>tty</span>表中对应结构项。若打开文件操作标</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>志<span lang=EN-US>flag</span>中不含无需控制终端标志<span
|
||
lang=EN-US>O_NOCTTY</span>，并且进程是进程组首领，并且当前进程没有控制</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>终端，并且<span lang=EN-US>tty</span>结构中<span
|
||
lang=EN-US>session</span>字端为<span lang=EN-US>0</span>（表示该终端还不是任何进程组的控制终端），那么</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>就允许为进程设置这个终端设备 <span
|
||
lang=EN-US>min </span>为其控制终端。于是设置进程任务结构终端设备号字段</p>
|
||
|
||
<p class=a><span lang=EN-US> // tty</span>值等于<span
|
||
lang=EN-US>min</span>，并且设置对应<span lang=EN-US>tty</span>结构的会话号<span lang=EN-US>session</span>和进程组号<span
|
||
lang=EN-US>pgrp</span>分别等于进程的会</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>话号和进程组号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US>
|
||
if ((<u><span style='color:blue'>IS_A_PTY_MASTER</span></u>(min)) &&
|
||
(inode->i_count>1))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US>
|
||
return -1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US>
|
||
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>
|
||
if (!(flag & <u><span style='color:blue'>O_NOCTTY</span></u>) &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->leader &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->tty<0 &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US>
|
||
tty->session==0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->tty = min;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US>
|
||
tty->session= <u><span style='color:blue'>current</span></u>->session;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US>
|
||
tty->pgrp = <u><span style='color:blue'>current</span></u>->pgrp;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果打开文件操作标志<span
|
||
lang=EN-US>flag</span>中含有<span lang=EN-US>O_NONBLOCK</span>（非阻塞）标志，则我们需要对该字符终端</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设备进行相关设置，设置为满足读操作需要读取的最少字符数为<span
|
||
lang=EN-US>0</span>，设置超时定时值为<span lang=EN-US>0</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并把终端设备设置成非规范模式。非阻塞方式只能工作于非规范模式。在此模式下当<span
|
||
lang=EN-US>VMIN</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>和<span lang=EN-US>VTIME</span>均设置为<span
|
||
lang=EN-US>0</span>时，辅助队列中有多少支付进程就读取多少字符，并立刻返回。参见</p>
|
||
|
||
<p class=a><span lang=EN-US> // include/termios.h</span>文件后的说明。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US>
|
||
if (flag & <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>
|
||
<u><span style='color:blue'>TTY_TABLE</span></u>(min)-><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>
|
||
<u><span style='color:blue'>TTY_TABLE</span></u>(min)-><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>
|
||
<u><span style='color:blue'>TTY_TABLE</span></u>(min)-><u><span
|
||
style='color:blue'>termios</span></u>.c_lflag &= ~ICANON;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US> 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> //// </span>打开（或创建）文件系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>filename</span>是文件名，<span
|
||
lang=EN-US>flag</span>是打开文件标志，它可取值：<span lang=EN-US>O_RDONLY</span>（只读）、<span
|
||
lang=EN-US>O_WRONLY</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>（只写）或<span lang=EN-US>O_RDWR</span>（读写），以及<span
|
||
lang=EN-US>O_CREAT</span>（创建）、<span lang=EN-US>O_EXCL</span>（被创建文件必须不存在）、</p>
|
||
|
||
<p class=a><span lang=EN-US> // O_APPEND</span>（在文件尾添加数据）等其他一些标志的组合，如果本调用创建了一个新文件，则</p>
|
||
|
||
<p class=a><span lang=EN-US> // mode</span>就用于指定文件的许可属性。这些属性有<span
|
||
lang=EN-US>S_IRWXU</span>（文件宿主具有读、写和执行权限）、</p>
|
||
|
||
<p class=a><span lang=EN-US> // S_IRUSR</span>（用户具有读文件权限）、<span
|
||
lang=EN-US>S_IRWXG</span>（组成员具有读、写和执行权限）等等。对于新</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>创建的文件，这些属性只应用于将来对文件的访问，创建了只读文件的打开调用也将返回一</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>个可读写的文件句柄。如果调用操作成功，则返回文件句柄<span
|
||
lang=EN-US>(</span>文件描述符<span lang=EN-US>)</span>，否则返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参见<span lang=EN-US>sys/stat.h</span>、<span
|
||
lang=EN-US>fcntl.h</span>。</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> 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> 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> 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> // </span>首先对参数进行处理。将用户设置的文件模式和进程模式屏蔽码相与，产生许可的文件模式。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>为了为打开文件建立一个文件句柄，需要搜索进程结构中文件结构指针数组，以查找一个空</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>闲项。空闲项的索引号<span
|
||
lang=EN-US>fd</span>即是句柄值。若已经没有空闲项，则返回出错码（参数无效）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US> mode &= 0777
|
||
& ~current-><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> for(fd=0 ; fd<<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>
|
||
if (!<u><span style='color:blue'>current</span></u>->filp[fd])
|
||
// </span>找到空闲项。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US> if (fd>=<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>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后我们设置当前进程的执行时关闭文件句柄（<span
|
||
lang=EN-US>close_on_exec</span>）位图，复位对应的比特位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // close_on_exec </span>是一个进程所有文件句柄的位图标志。每个比特位代表一个打开着的文件描</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>述符，用于确定在调用系统调用 <span
|
||
lang=EN-US>execve()</span>时需要关闭的文件句柄。当程序使用 <span lang=EN-US>fork()</span>函数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>创建了一个子进程时，通常会在该子进程中调用<span
|
||
lang=EN-US>execve()</span>函数加载执行另一个新程序。此时</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>子进程中开始执行新程序。若一个文件句柄在<span
|
||
lang=EN-US>close_on_exec</span>中的对应比特位被置位，那么</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在执行<span lang=EN-US>execve()</span>时该对应文件句柄将被关闭，否则该文件句柄将始终处于打开状态。当打开</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一个文件时，默认情况下文件句柄在子进程中也处于打开状态。因此这里要复位对应比特位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后为打开文件在文件表中寻找一个空闲结构项。我们令<span
|
||
lang=EN-US>f</span>指向文件表数组开始处。搜索空</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>闲文件结构项（引用计数为<span
|
||
lang=EN-US>0</span>的项），若已经没有空闲文件表结构项，则返回出错码。另外，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>184</span>行上的指针赋值
|
||
<span lang=EN-US>"0+file_table " </span>等同于 <span lang=EN-US>"file_table"
|
||
</span>和 <span lang=EN-US>"&file_table[0]"</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>不过这样写可能更能明了一些。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->close_on_exec &= ~(1<<fd);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US> 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> for (i=0 ; i<<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>
|
||
if (!f->f_count) break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US> if (i>=<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>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>此时我们让进程对应文件句柄<span
|
||
lang=EN-US>fd</span>的文件结构指针指向搜索到的文件结构，并令文件引用计数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>递增<span lang=EN-US>1</span>。然后调用函数<span
|
||
lang=EN-US>open_namei()</span>执行打开操作，若返回值小于<span lang=EN-US>0</span>，则说明出错，于是释放</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>刚申请到的文件结构，返回出错码<span
|
||
lang=EN-US>i</span>。若文件打开操作成功，则<span lang=EN-US>inode</span>是已打开文件的<span
|
||
lang=EN-US>i</span>节点</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US> (<u><span
|
||
style='color:blue'>current</span></u>->filp[fd]=f)->f_count++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US> if ((i=<u><span
|
||
style='color:blue'>open_namei</span></u>(filename,flag,mode,&inode))<0)
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->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>
|
||
f->f_count=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US>
|
||
return i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>根据已打开文件<span
|
||
lang=EN-US>i</span>节点的属性字段，我们可以知道文件的类型。对于不同类型的文件，我们</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>需要作一些特别处理。 如果打开的是字符设备文件，那么我们就要调用<span
|
||
lang=EN-US>check_char_dev()</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>函数来检查当前进程是否能打开这个字符设备文件。如果允许（函数返回<span
|
||
lang=EN-US>0</span>），那么在</p>
|
||
|
||
<p class=a><span lang=EN-US> // check_char_dev()</span>中会根据具体文件打开标志为进程设置控制终端。
|
||
如果不允许打开</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>使用该字符设备文件，那么我们只能释放上面申请的文件项和句柄资源，返回出错码。</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> /* ttys</span>有些特殊（<span
|
||
lang=EN-US>ttyxx</span>的主设备号<span lang=EN-US>==4</span>，<span lang=EN-US>tty</span>的主设备号<span
|
||
lang=EN-US>==5</span>）<span lang=EN-US>*/</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>S_ISCHR</span></u>(inode->i_mode))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>check_char_dev</span></u>(inode,inode->i_zone[0],flag))
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US>
|
||
<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>
|
||
<u><span style='color:blue'>current</span></u>->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>
|
||
f->f_count=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> return
|
||
-<u><span style='color:blue'>EAGAIN</span></u>;
|
||
// </span>出错号：资源暂时不可用。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果打开的是块设备文件，则检查盘片是否更换过。若更换过则需要让高速缓冲区中该设备</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的所有缓冲块失效。</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> /* </span>同样对于块设备文件：需要检查盘片是否被更换<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>S_ISBLK</span></u>(inode->i_mode))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>check_disk_change</span></u>(inode->i_zone[0]);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在我们初始化打开文件的文件结构。设置文件结构属性和标志，置句柄引用计数为<span
|
||
lang=EN-US>1</span>，并</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置<span lang=EN-US>i</span>节点字段为打开文件的<span
|
||
lang=EN-US>i</span>节点，初始化文件读写指针为<span lang=EN-US>0</span>。最后返回文件句柄号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US> f->f_mode =
|
||
inode->i_mode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US> f->f_flags =
|
||
flag;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US> f->f_count = 1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US> f->f_inode =
|
||
inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US> f->f_pos = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US> 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> //// </span>创建文件系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>pathname</span>是路径名，<span
|
||
lang=EN-US>mode</span>与上面的<span lang=EN-US>sys_open()</span>函数相同。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>成功则返回文件句柄，否则返回出错码。</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> 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> // </span>关闭文件系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>fd</span>是文件句柄。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>成功则返回<span lang=EN-US>0</span>，否则返回出错码。</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> { </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
|
||
lang=EN-US> 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> // </span>首先检查参数有效性。若给出的文件句柄值大于程序同时能打开的文件数<span
|
||
lang=EN-US>NR_OPEN</span>，则返回</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>出错码（参数无效）。然后复位进程的执行时关闭文件句柄位图对应位。若该文件句柄对应</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的文件结构指针是<span
|
||
lang=EN-US>NULL</span>，则返回出错码。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
|
||
lang=EN-US> if (fd >= <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>
|
||
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> <u><span
|
||
style='color:blue'>current</span></u>->close_on_exec &= ~(1<<fd);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
|
||
lang=EN-US> if (!(filp = <u><span
|
||
style='color:blue'>current</span></u>->filp[fd]))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
|
||
lang=EN-US> return
|
||
-<u><span style='color:blue'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在置该文件句柄的文件结构指针为<span
|
||
lang=EN-US>NULL</span>。若在关闭文件之前，对应文件结构中的句柄引用</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>计数已经为<span lang=EN-US>0</span>，则说明内核出错，停机。否则将对应文件结构的引用计数减<span
|
||
lang=EN-US>1</span>。此时如果它还</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>不为<span lang=EN-US>0</span>，则说明有其他进程正在使用该文件，于是返回<span
|
||
lang=EN-US>0</span>（成功）。如果引用计数已等于<span lang=EN-US>0</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>说明该文件已经没有进程引用，该文件结构已变为空闲。则释放该文件<span
|
||
lang=EN-US>i</span>节点，返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->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> if
|
||
(filp->f_count == 0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"Close: file count is
|
||
0"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US> if
|
||
(--filp->f_count)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US>
|
||
return (0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>iput</span></u>(filp->f_inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
|
||
lang=EN-US> 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> </span></p>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|