3202 lines
125 KiB
HTML
3202 lines
125 KiB
HTML
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|
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|
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|
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</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="_Toc53320627"><span style='font-family:黑体'>程序</span><span
|
||
lang=EN-US>10-6 linux/kernel/chr_drv/tty_ioctl.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/kernel/chr_drv/tty_ioctl.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 <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'>8</span></u>
|
||
#include <termios.h> // </span>终端输入输出函数头文件。主要定义控制异步通信口的终端接口。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</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>的数据等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</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'>12</span></u>
|
||
#include <linux/tty.h> // tty</span>头文件，定义有关<span
|
||
lang=EN-US>tty_io</span>、串行通信方面参数、常数。</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 <asm/io.h> // io</span>头文件。定义硬件端口输入<span
|
||
lang=EN-US>/</span>输出宏汇编语句。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</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'>16</span></u>
|
||
#include <asm/system.h> // </span>系统头文件。定义设置或修改描述符<span
|
||
lang=EN-US>/</span>中断门等的嵌入式汇编宏。</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> // </span>根据进程组号<span
|
||
lang=EN-US>pgrp</span>取得进程组所属的会话号。定义在<span lang=EN-US>kernel/exit.c</span>，<span
|
||
lang=EN-US>161</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u>
|
||
extern int <u><span style='color:blue'>session_of_pgrp</span></u>(int pgrp);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>向使用指定<span lang=EN-US>tty</span>终端的进程组中所有进程发送信号。定义在<span
|
||
lang=EN-US>chr_drv/tty_io.c</span>，<span lang=EN-US>246</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u>
|
||
extern int <u><span style='color:blue'>tty_signal</span></u>(int sig, struct <u><span
|
||
style='color:blue'>tty_struct</span></u> *tty);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这是波特率因子数组（或称为除数数组）。波特率与波特率因子的对应关系参见列表后说明。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>例如波特率是<span
|
||
lang=EN-US>2400bps</span>时，对应的因子是<span lang=EN-US>48</span>（<span lang=EN-US>0x30</span>）；<span
|
||
lang=EN-US>9600bps</span>的因子是<span lang=EN-US>12</span>（<span lang=EN-US>0x1c</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u>
|
||
static unsigned short <u><span style='color:blue'>quotient</span></u>[] = {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u>
|
||
0, 2304, 1536, 1047, 857,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u>
|
||
768, 576, 384, 192, 96,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u>
|
||
64, 48, 24, 12, 6, 3</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</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> //// </span>修改传输波特率。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>tty
|
||
- </span>终端对应的<span lang=EN-US>tty</span>数据结构。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在除数锁存标志<span
|
||
lang=EN-US>DLAB</span>置位情况下，通过端口<span lang=EN-US>0x3f8</span>和<span
|
||
lang=EN-US>0x3f9</span>向<span
|
||
lang=EN-US>UART</span>分别写入波特率因子低</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>字节和高字节。写完后再复位<span
|
||
lang=EN-US>DLAB</span>位。对于串口<span lang=EN-US>2</span>，这两个端口分别是<span lang=EN-US>0x2f8</span>和<span
|
||
lang=EN-US>0x2f9</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
static void <u><span style='color:blue'>change_speed</span></u>(struct <u><span
|
||
style='color:blue'>tty_struct</span></u> * tty)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u>
|
||
unsigned short port,quot;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>函数首先检查参数<span
|
||
lang=EN-US>tty </span>指定的终端是否是串行终端，若不是则退出。对于串口终端的<span lang=EN-US>tty</span>结</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>构，其读缓冲队列<span
|
||
lang=EN-US>data </span>字段存放着串行端口基址（<span lang=EN-US>0x3f8</span>或<span
|
||
lang=EN-US>0x2f8</span>），而一般控制台终端的</p>
|
||
|
||
<p class=a><span lang=EN-US> // tty</span>结构的<span
|
||
lang=EN-US>read_q.data</span>字段值为<span lang=EN-US>0</span>。然后从终端<span
|
||
lang=EN-US>termios</span>结构的控制模式标志集中取得已设</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>置的波特率索引号，并据此从波特率因子数组<span
|
||
lang=EN-US>quotient[]</span>中取得对应的波特率因子值<span lang=EN-US>quot</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // CBAUD</span>是控制模式标志集中波特率位屏蔽码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u>
|
||
if (!(port = tty->read_q->data))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
quot = <u><span style='color:blue'>quotient</span></u>[tty-><u><span
|
||
style='color:blue'>termios</span></u>.c_cflag & <u><span style='color:blue'>CBAUD</span></u>];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着把波特率因子<span
|
||
lang=EN-US>quot</span>写入串行端口对应<span lang=EN-US>UART</span>芯片的波特率因子锁存器中。在写之前我们</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>先要把线路控制寄存器<span
|
||
lang=EN-US> LCR </span>的除数锁存访问比特位<span lang=EN-US>DLAB</span>（位<span
|
||
lang=EN-US>7</span>）置<span lang=EN-US>1</span>。然后把<span lang=EN-US> 16</span>位的波特</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>率因子低高字节分别写入端口<span
|
||
lang=EN-US> 0x3f8</span>、<span
|
||
lang=EN-US>0x3f9 </span>（分别对应波特率因子低、高字节锁存器）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后再复位<span lang=EN-US>LCR</span>的<span
|
||
lang=EN-US>DLAB</span>标志位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
<u><span style='color:blue'>cli</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
<u><span style='color:blue'>outb_p</span></u>(0x80,port+3);
|
||
<b><i>/* set DLAB */</i></b> // </span>首先设置除数锁定标志<span lang=EN-US>DLAB</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u>
|
||
<u><span style='color:blue'>outb_p</span></u>(quot &
|
||
0xff,port); <b><i>/* LS of divisor */</i></b> // </span>输出因子低字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u>
|
||
<u><span style='color:blue'>outb_p</span></u>(quot >>
|
||
8,port+1); <b><i>/* MS of divisor */</i></b> // </span>输出因子高字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u>
|
||
<u><span style='color:blue'>outb</span></u>(0x03,port+3);
|
||
<b><i>/* reset DLAB */</i></b> // </span>复位<span
|
||
lang=EN-US>DLAB</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u>
|
||
<u><span style='color:blue'>sti</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>刷新<span lang=EN-US>tty</span>缓冲队列。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>queue
|
||
- </span>指定的缓冲队列指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>令缓冲队列的头指针等于尾指针，从而达到清空缓冲区的目的。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u>
|
||
static void <u><span style='color:blue'>flush</span></u>(struct <u><span
|
||
style='color:blue'>tty_queue</span></u> * queue)</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>
|
||
<u><span style='color:blue'>cli</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u>
|
||
queue-><u><span style='color:blue'>head</span></u> = queue->tail;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u>
|
||
<u><span style='color:blue'>sti</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>等待字符发送出去。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u>
|
||
static void <u><span style='color:blue'>wait_until_sent</span></u>(struct <u><span
|
||
style='color:blue'>tty_struct</span></u> * tty)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
<b><i>/* do nothing - not implemented */</i></b> /* </span>什么都没做<span
|
||
lang=EN-US> - </span>还未实现<span lang=EN-US> */</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> <u><span style='color:blue'>53</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>发送<span lang=EN-US>BREAK</span>控制符。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
static void <u><span style='color:blue'>send_break</span></u>(struct <u><span
|
||
style='color:blue'>tty_struct</span></u> * tty)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u>
|
||
<b><i>/* do nothing - not implemented */</i></b> /* </span>什么都没做<span
|
||
lang=EN-US> - </span>还未实现<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>取终端<span lang=EN-US>termios</span>结构信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>tty
|
||
- </span>指定终端的<span lang=EN-US>tty</span>结构指针；<span lang=EN-US>termios - </span>存放<span
|
||
lang=EN-US>termios</span>结构的用户缓冲区。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u>
|
||
static int <u><span style='color:blue'>get_termios</span></u>(struct <u><span
|
||
style='color:blue'>tty_struct</span></u> * tty, struct <u><span
|
||
style='color:blue'>termios</span></u> * <u><span style='color:blue'>termios</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先验证用户缓冲区指针所指内存区容量是否足够，如不够则分配内存。然后复制指定终端</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的<span lang=EN-US>termios</span>结构信息到用户缓冲区中。最后返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
<u><span style='color:blue'>verify_area</span></u>(<u><span style='color:blue'>termios</span></u>,
|
||
sizeof (*<u><span style='color:blue'>termios</span></u>));
|
||
// kernel/fork.c</span>，<span lang=EN-US>24</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
for (i=0 ; i< (sizeof (*<u><span style='color:blue'>termios</span></u>)) ;
|
||
i++)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u>
|
||
<u><span style='color:blue'>put_fs_byte</span></u>( ((char *)&tty-><u><span
|
||
style='color:blue'>termios</span></u>)[i] , i+(char *)<u><span
|
||
style='color:blue'>termios</span></u> );</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>设置终端<span
|
||
lang=EN-US>termios</span>结构信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>tty
|
||
- </span>指定终端的<span lang=EN-US>tty</span>结构指针；<span lang=EN-US>termios - </span>用户数据区<span
|
||
lang=EN-US>termios</span>结构指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u>
|
||
static int <u><span style='color:blue'>set_termios</span></u>(struct <u><span
|
||
style='color:blue'>tty_struct</span></u> * tty, struct <u><span
|
||
style='color:blue'>termios</span></u> * <u><span style='color:blue'>termios</span></u>,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u>
|
||
int channel)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u>
|
||
int i, retsig;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u>
|
||
<b><i>/* If we try to set the state of terminal and we're not in the</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u> <b><i> foreground,
|
||
send a SIGTTOU. If the signal is blocked or</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u> <b><i> ignored,
|
||
go ahead and perform the operation. POSIX 7.2) */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>如果试图设置终端的状态但此时终端不在前台，那么我们就需要发送</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
</span>一个<span lang=EN-US>SIGTTOU</span>信号。如果该信号被进程屏蔽或者忽略了，就直接执行</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
</span>本次操作。<span lang=EN-US> POSIX 7.2 */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前进程使用的<span
|
||
lang=EN-US>tty</span>终端的进程组号与进程的进程组号不同，即当前进程终端不在前台，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>表示当前进程试图修改不受控制的终端的<span
|
||
lang=EN-US>termios</span>结构。因此根据<span lang=EN-US>POSIX</span>标准的要求这里需</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>要发送<span lang=EN-US>SIGTTOU</span>信号让使用这个终端的进程先暂时停止执行，以让我们先修改<span
|
||
lang=EN-US>termios</span>结构。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果发送信号函数<span
|
||
lang=EN-US>tty_signal()</span>返回值是<span lang=EN-US>ERESTARTSYS</span>或<span
|
||
lang=EN-US>EINTR</span>，则等一会再执行本次操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u>
|
||
if ((<u><span style='color:blue'>current</span></u>->tty == channel)
|
||
&& (tty->pgrp != <u><span style='color:blue'>current</span></u>->pgrp))
|
||
{</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
retsig = <u><span
|
||
style='color:blue'>tty_signal</span></u>(<u><span style='color:blue'>SIGTTOU</span></u>,
|
||
tty); // chr_drv/tty_io.c</span>，<span lang=EN-US>246</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
if (retsig == -<u><span style='color:blue'>ERESTARTSYS</span></u> || retsig ==
|
||
-<u><span style='color:blue'>EINTR</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
return retsig;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着把用户数据区中<span
|
||
lang=EN-US>termios</span>结构信息复制到指定终端<span lang=EN-US>tty</span>结构的<span
|
||
lang=EN-US>termios</span>结构中。因为用</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>户有可能已修改了终端串行口传输波特率，所以这里再根据<span
|
||
lang=EN-US>termios</span>结构中的控制模式标志</p>
|
||
|
||
<p class=a><span lang=EN-US> // c_cflag</span>中的波特率信息修改串行<span
|
||
lang=EN-US>UART</span>芯片内的传输波特率。最后返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
for (i=0 ; i< (sizeof (*<u><span style='color:blue'>termios</span></u>)) ;
|
||
i++)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
((char *)&tty-><u><span style='color:blue'>termios</span></u>)[i]=<u><span
|
||
style='color:blue'>get_fs_byte</span></u>(i+(char *)<u><span style='color:blue'>termios</span></u>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
<u><span style='color:blue'>change_speed</span></u>(tty);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>读取<span lang=EN-US>termio</span>结构中的信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>tty
|
||
- </span>指定终端的<span lang=EN-US>tty</span>结构指针；<span lang=EN-US>termio - </span>保存<span
|
||
lang=EN-US>termio</span>结构信息的用户缓冲区。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
static int <u><span style='color:blue'>get_termio</span></u>(struct <u><span
|
||
style='color:blue'>tty_struct</span></u> * tty, struct <u><span
|
||
style='color:blue'>termio</span></u> * <u><span style='color:blue'>termio</span></u>)</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>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
struct <u><span style='color:blue'>termio</span></u> tmp_termio;</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> // </span>首先验证用户的缓冲区指针所指内存区容量是否足够，如不够则分配内存。然后将<span
|
||
lang=EN-US>termios</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>结构的信息复制到临时 <span
|
||
lang=EN-US>termio </span>结构中。这两个结构基本相同，但输入、输出、控制和本地</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>标志集数据类型不同。前者的是<span
|
||
lang=EN-US>long</span>，而后者的是<span lang=EN-US>short</span>。因此先复制到临时<span
|
||
lang=EN-US>termio</span>结构</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>中目的是为了进行数据类型转换。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
<u><span style='color:blue'>verify_area</span></u>(<u><span style='color:blue'>termio</span></u>,
|
||
sizeof (*<u><span style='color:blue'>termio</span></u>));</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u>
|
||
tmp_termio.c_iflag = tty-><u><span style='color:blue'>termios</span></u>.c_iflag;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
tmp_termio.c_oflag = tty-><u><span style='color:blue'>termios</span></u>.c_oflag;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
tmp_termio.c_cflag = tty-><u><span style='color:blue'>termios</span></u>.c_cflag;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
tmp_termio.c_lflag = tty-><u><span style='color:blue'>termios</span></u>.c_lflag;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
tmp_termio.c_line = tty-><u><span style='color:blue'>termios</span></u>.c_line;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
for(i=0 ; i < <u><span style='color:blue'>NCC</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US>
|
||
tmp_termio.c_cc[i] = tty-><u><span style='color:blue'>termios</span></u>.c_cc[i];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后逐字节地把临时<span
|
||
lang=EN-US>termio</span>结构中的信息复制到用户<span lang=EN-US>termio</span>结构缓冲区中。并返回<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> for (i=0 ; i<
|
||
(sizeof (*<u><span style='color:blue'>termio</span></u>)) ; i++)</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'>put_fs_byte</span></u>( ((char *)&tmp_termio)[i]
|
||
, i+(char *)<u><span style='color:blue'>termio</span></u> );</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><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
|
||
lang=EN-US> <b><i> * This only works as the 386 is low-byt-first</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>下面<span
|
||
lang=EN-US>termio</span>设置函数仅适用于低字节在前的<span lang=EN-US>386 CPU</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>设置终端<span
|
||
lang=EN-US>termio</span>结构信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>tty
|
||
- </span>指定终端的<span lang=EN-US>tty</span>结构指针；<span lang=EN-US>termio - </span>用户数据区中<span
|
||
lang=EN-US>termio</span>结构。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>将用户缓冲区<span
|
||
lang=EN-US>termio</span>的信息复制到终端的<span lang=EN-US>termios</span>结构中。返回<span
|
||
lang=EN-US>0 </span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US> static int <u><span style='color:blue'>set_termio</span></u>(struct
|
||
<u><span style='color:blue'>tty_struct</span></u> * tty, struct <u><span
|
||
style='color:blue'>termio</span></u> * <u><span style='color:blue'>termio</span></u>,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US>
|
||
int channel)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US> int i, retsig;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>termio</span></u> tmp_termio;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>与<span lang=EN-US>set_termios()</span>一样，如果进程使用的终端的进程组号与进程的进程组号不同，即当前进</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程终端不在前台，表示当前进程试图修改不受控制的终端的<span
|
||
lang=EN-US>termios</span>结构。因此根据<span lang=EN-US>POSIX</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>标准的要求这里需要发送<span
|
||
lang=EN-US>SIGTTOU</span>信号让使用这个终端的进程先暂时停止执行，以让我们先</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>修改<span lang=EN-US>termios</span>结构。如果发送信号函数<span
|
||
lang=EN-US>tty_signal()</span>返回值是<span lang=EN-US>ERESTARTSYS</span>或<span
|
||
lang=EN-US>EINTR</span>，则等</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一会再执行本次操作。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US> if ((<u><span
|
||
style='color:blue'>current</span></u>->tty == channel) &&
|
||
(tty->pgrp != <u><span style='color:blue'>current</span></u>->pgrp)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US>
|
||
retsig = <u><span style='color:blue'>tty_signal</span></u>(<u><span
|
||
style='color:blue'>SIGTTOU</span></u>, tty);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US>
|
||
if (retsig == -<u><span style='color:blue'>ERESTARTSYS</span></u> || retsig ==
|
||
-<u><span style='color:blue'>EINTR</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US>
|
||
return retsig;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着复制用户数据区中<span
|
||
lang=EN-US>termio</span>结构信息到临时<span lang=EN-US>termio</span>结构中。然后再将<span
|
||
lang=EN-US>termio</span>结构的信息</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>复制到<span lang=EN-US>tty</span>的
|
||
<span lang=EN-US>termios </span>结构中。这样做的目的是为了对其中模式标志集的类型进行转换，即</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>从 <span lang=EN-US>termio</span>的短整数类型转换成<span
|
||
lang=EN-US>termios</span>的长整数类型。但两种结构的<span lang=EN-US>c_line</span>和<span
|
||
lang=EN-US>c_cc[]</span>字段</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>是完全相同的。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US> for (i=0 ; i<
|
||
(sizeof (*<u><span style='color:blue'>termio</span></u>)) ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US>
|
||
((char *)&tmp_termio)[i]=<u><span style='color:blue'>get_fs_byte</span></u>(i+(char
|
||
*)<u><span style='color:blue'>termio</span></u>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US> *(unsigned short
|
||
*)&tty-><u><span style='color:blue'>termios</span></u>.c_iflag =
|
||
tmp_termio.c_iflag;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US> *(unsigned short
|
||
*)&tty-><u><span style='color:blue'>termios</span></u>.c_oflag =
|
||
tmp_termio.c_oflag;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US> *(unsigned short
|
||
*)&tty-><u><span style='color:blue'>termios</span></u>.c_cflag = tmp_termio.c_cflag;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US> *(unsigned short
|
||
*)&tty-><u><span style='color:blue'>termios</span></u>.c_lflag =
|
||
tmp_termio.c_lflag;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US> tty-><u><span
|
||
style='color:blue'>termios</span></u>.c_line = tmp_termio.c_line;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> for(i=0 ; i < <u><span
|
||
style='color:blue'>NCC</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US>
|
||
tty-><u><span style='color:blue'>termios</span></u>.c_cc[i] =
|
||
tmp_termio.c_cc[i];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后因为用户有可能已修改了终端串行口传输波特率，所以这里再根据<span
|
||
lang=EN-US>termios</span>结构中的控制</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>模式标志<span lang=EN-US>c_cflag</span>中的波特率信息修改串行<span
|
||
lang=EN-US>UART</span>芯片内的传输波特率，并返回<span lang=EN-US>0</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'>change_speed</span></u>(tty);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US> return 0;</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><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// tty</span>终端设备输入输出控制函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dev
|
||
- </span>设备号；<span lang=EN-US>cmd - ioctl</span>命令；<span lang=EN-US>arg - </span>操作参数指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数首先根据参数给出的设备号找出对应终端的<span
|
||
lang=EN-US>tty</span>结构，然后根据控制命令<span lang=EN-US>cmd</span>分别进行</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>处理。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>tty_ioctl</span></u>(int dev, int
|
||
cmd, int arg)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</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'>136</span></u><span
|
||
lang=EN-US>
|
||
int pgrp;</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><span lang=EN-US> // </span>首先根据设备号取得<span
|
||
lang=EN-US>tty</span>子设备号，从而取得终端的<span lang=EN-US>tty</span>结构。若主设备号是<span
|
||
lang=EN-US>5</span>（控制终端），</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则进程的<span lang=EN-US>tty</span>字段即是<span
|
||
lang=EN-US>tty</span>子设备号。此时如果进程的<span lang=EN-US>tty</span>子设备号是负数，表明该进程没有</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>控制终端，即不能发出该<span
|
||
lang=EN-US>ioctl</span>调用，于是显示出错信息并停机。如果主设备号不是<span lang=EN-US>5</span>而是<span
|
||
lang=EN-US>4</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>我们就可以从设备号中取出子设备号。子设备号可以是<span
|
||
lang=EN-US>0</span>（控制台终端）、<span lang=EN-US>1</span>（串口<span lang=EN-US>1</span>终端）、</p>
|
||
|
||
<p class=a><span lang=EN-US> // 2</span>（串口<span lang=EN-US>2</span>终端）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</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'>139</span></u><span
|
||
lang=EN-US>
|
||
dev=<u><span style='color:blue'>current</span></u>->tty;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US>
|
||
if (dev<0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"tty_ioctl: dev<0"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US> } else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US>
|
||
dev=<u><span style='color:blue'>MINOR</span></u>(dev);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后根据子设备号和<span
|
||
lang=EN-US>tty</span>表，我们可取得对应终端的<span lang=EN-US>tty</span>结构。于是让<span
|
||
lang=EN-US>tty</span>指向对应子设备</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号的<span lang=EN-US>tty</span>结构。然后再根据参数提供的<span
|
||
lang=EN-US>ioctl</span>命令<span lang=EN-US>cmd</span>进行分别处理。<span lang=EN-US>144</span>行后半部分用于</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>根据子设备号<span
|
||
lang=EN-US>dev</span>在<span lang=EN-US>tty_table[]</span>表中选择对应的<span
|
||
lang=EN-US>tty</span>结构。如果<span lang=EN-US>dev = 0</span>，表示正在使用</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>前台终端，因此直接使用终端号<span
|
||
lang=EN-US>fg_console </span>作为 <span lang=EN-US>tty_table[] </span>项索引取 <span
|
||
lang=EN-US>tty</span>结构。如果</p>
|
||
|
||
<p class=a><span lang=EN-US> // dev</span>大于<span lang=EN-US>0</span>，那么就要分两种情况考虑：①
|
||
<span lang=EN-US>dev </span>是虚拟终端号；② <span lang=EN-US>dev </span>是串行终端号或者</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>伪终端号。对于虚拟终端其<span
|
||
lang=EN-US>tty</span>结构在 <span lang=EN-US>tty_table[]</span>中索引项是 <span
|
||
lang=EN-US>dev-1</span>（<span lang=EN-US>0 -- 63</span>）。对于</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>其它类型终端，则它们的 <span
|
||
lang=EN-US>tty</span>结构索引项就是 <span lang=EN-US>dev</span>。例如，如果<span lang=EN-US>dev
|
||
= 64</span>，表示是一个串</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>行终端<span lang=EN-US>1</span>，则其<span
|
||
lang=EN-US>tty </span>结构就是 <span lang=EN-US>ttb_table[dev]</span>。 如果<span
|
||
lang=EN-US>dev = 1</span>，则对应终端的<span lang=EN-US>tty</span>结构是</p>
|
||
|
||
<p class=a><span lang=EN-US> // tty_table[0]</span>。参见<span
|
||
lang=EN-US>tty_io.c</span>程序第<span lang=EN-US>70 -- 73</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> tty = <u><span
|
||
style='color:blue'>tty_table</span></u> + (dev ? ((dev < 64)? dev-1:dev) : <u><span
|
||
style='color:blue'>fg_console</span></u>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US> switch (cmd) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>取相应终端<span lang=EN-US>termios</span>结构信息。此时参数<span
|
||
lang=EN-US>arg</span>是用户缓冲区指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCGETS</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US> return
|
||
<u><span style='color:blue'>get_termios</span></u>(tty,(struct <u><span
|
||
style='color:blue'>termios</span></u> *) arg);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在设置<span lang=EN-US>termios</span>结构信息之前，需要先等待输出队列中所有数据处理完毕，并且刷新（清空）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入队列。再接着执行下面设置终端<span
|
||
lang=EN-US>termios</span>结构的操作。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCSETSF</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>flush</span></u>(tty->read_q); <b><i>/*
|
||
fallthrough */</i></b> /* </span>接着继续执行<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在设置终端<span lang=EN-US>termios</span>的信息之前，需要先等待输出队列中所有数据处理完（耗尽）。对于修改</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数会影响输出的情况，就需要使用这种形式。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCSETSW</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wait_until_sent</span></u>(tty); <b><i>/*
|
||
fallthrough */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置相应终端<span
|
||
lang=EN-US>termios</span>结构信息。此时参数<span lang=EN-US>arg</span>是保存<span
|
||
lang=EN-US>termios</span>结构的用户缓冲区指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US> case
|
||
<u><span style='color:blue'>TCSETS</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US>
|
||
return <u><span style='color:blue'>set_termios</span></u>(tty,(struct <u><span
|
||
style='color:blue'>termios</span></u> *) arg, dev);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>取相应终端<span lang=EN-US>termio</span>结构中的信息。此时参数<span
|
||
lang=EN-US>arg</span>是用户缓冲区指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCGETA</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US>
|
||
return <u><span style='color:blue'>get_termio</span></u>(tty,(struct <u><span
|
||
style='color:blue'>termio</span></u> *) arg);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在设置<span lang=EN-US>termio
|
||
</span>结构信息之前，需要先等待输出队列中所有数据处理完毕，并且刷新（清空）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入队列。再接着执行下面设置终端<span
|
||
lang=EN-US>termio </span>结构的操作。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCSETAF</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>flush</span></u>(tty->read_q); <b><i>/*
|
||
fallthrough */</i></b> /* </span>接着继续执行<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在设置终端<span lang=EN-US>termios</span>的信息之前，需要先等待输出队列中所有数据处理完（耗尽）。对于修改</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数会影响输出的情况，就需要使用这种形式。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCSETAW</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wait_until_sent</span></u>(tty); <b><i>/*
|
||
fallthrough */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置相应终端<span
|
||
lang=EN-US>termio</span>结构信息。此时参数<span lang=EN-US>arg</span>是保存<span
|
||
lang=EN-US>termio</span>结构的用户缓冲区指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCSETA</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US>
|
||
return <u><span style='color:blue'>set_termio</span></u>(tty,(struct <u><span
|
||
style='color:blue'>termio</span></u> *) arg, dev);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果参数<span lang=EN-US>arg</span>值是<span
|
||
lang=EN-US>0</span>，则等待输出队列处理完毕（空），并发送一个<span lang=EN-US>break</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCSBRK</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US>
|
||
if (!arg) {</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'>wait_until_sent</span></u>(tty);</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'>send_break</span></u>(tty);</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>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>开始<span lang=EN-US>/</span>停止流控制。如果参数<span
|
||
lang=EN-US>arg</span>是<span lang=EN-US>TCOOFF</span>（<span lang=EN-US>Terminal
|
||
Control Output OFF</span>），则挂起输出；</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果是 <span lang=EN-US>TCOON</span>，则恢复挂起的输出。在挂起或恢复输出同时需要把写队列中的字符输出，以</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>加快用户交互响应速度。如果<span
|
||
lang=EN-US>arg</span>是<span lang=EN-US>TCIOFF</span>（<span lang=EN-US>Terminal
|
||
Control Input ON</span>），则挂起输入；</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果是<span lang=EN-US>TCION</span>，则重新开启挂起的输入。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCXONC</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US>
|
||
switch (arg) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCOOFF</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US>
|
||
tty->stopped = 1; // </span>停止终端输出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US>
|
||
tty-><u><span style='color:blue'>write</span></u>(tty);
|
||
// </span>写缓冲队列输出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCOON</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US>
|
||
tty->stopped = 0; // </span>恢复终端输出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US>
|
||
tty-><u><span style='color:blue'>write</span></u>(tty);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果参数<span lang=EN-US>arg</span>是<span
|
||
lang=EN-US>TCIOFF</span>，表示要求终端停止输入，于是我们往终端写队列中放入<span lang=EN-US>STOP</span>字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当终端收到该字符时就会暂停输入。如果参数是<span
|
||
lang=EN-US>TCION</span>，表示要发送一个<span lang=EN-US>START</span>字符，让终</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>端恢复传输。</p>
|
||
|
||
<p class=a><span lang=EN-US> // STOP_CHAR(tty)</span>定义为 <span
|
||
lang=EN-US>((tty)-><u><span style='color:blue'>termios</span></u>.c_cc[<u><span
|
||
style='color:blue'>VSTOP</span></u>])</span>，即取终端<span lang=EN-US>termios</span>结构控制字符数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>组对应项值。若内核定义了<span
|
||
lang=EN-US>_POSIX_VDISABLE</span>（<span lang=EN-US>\0</span>），那么当某一项值等于<span
|
||
lang=EN-US>_POSIX_VDISABLE</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的值时，表示禁止使用相应的特殊字符。因此这里直接判断该值是否为<span
|
||
lang=EN-US>0 </span>来确定要不要把停</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>止控制字符放入终端写队列中。以下同。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCIOFF</span></u>:</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'>STOP_CHAR</span></u>(tty))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US>
|
||
<u><span
|
||
style='color:blue'>PUTCH</span></u>(<u><span style='color:blue'>STOP_CHAR</span></u>(tty),tty->write_q);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCION</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>START_CHAR</span></u>(tty))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>PUTCH</span></u>(<u><span style='color:blue'>START_CHAR</span></u>(tty),tty->write_q);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>刷新已写输出但还没有发送、或已收但还没有读的数据。如果参数<span
|
||
lang=EN-US>arg</span>是<span lang=EN-US>0</span>，则刷新（清空）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入队列；如果是<span
|
||
lang=EN-US>1</span>，则刷新输出队列；如果是<span lang=EN-US>2</span>，则刷新输入和输出队列。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TCFLSH</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US>
|
||
if (arg==0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>flush</span></u>(tty->read_q);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US>
|
||
else if (arg==1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>flush</span></u>(tty->write_q);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US>
|
||
else if
|
||
(arg==2) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>flush</span></u>(tty->read_q);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>flush</span></u>(tty->write_q);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
|
||
lang=EN-US>
|
||
} else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>197</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'>198</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置终端串行线路专用模式。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCEXCL</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b> /* </span>未实现<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>复位终端串行线路专用模式。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCNXCL</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置<span lang=EN-US>tty</span>为控制终端。（<span
|
||
lang=EN-US>TIOCNOTTY - </span>不要控制终端）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCSCTTY</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* set controlling
|
||
term NI */</i></b> /* </span>未实现<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>读取终端进程组号（即读取前台进程组号）。 首先验证用户缓冲区长度，然后复制终端<span
|
||
lang=EN-US>tty</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的<span lang=EN-US>pgrp</span>字段到用户缓冲区。此时参数<span
|
||
lang=EN-US>arg</span>是用户缓冲区指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCGPGRP</span></u>:
|
||
// </span>实现库函数<span lang=EN-US>tcgetpgrp()</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>verify_area</span></u>((void *) arg,4);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>put_fs_long</span></u>(tty->pgrp,(unsigned long
|
||
*) arg);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置终端进程组号<span
|
||
lang=EN-US>pgrp</span>（即设置前台进程组号）。 此时参数<span lang=EN-US>arg </span>是用户缓冲区中进程组号</p>
|
||
|
||
<p class=a><span lang=EN-US> // pgrp </span>的指针。执行该命令的前提条件是进程必须有控制终端。
|
||
如果当前进程没有控制终端，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>或者<span lang=EN-US>dev
|
||
</span>不是其控制终端，或者控制终端现在的确是正在处理的终端<span lang=EN-US>dev</span>，但进程的会话号</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>与该终端<span lang=EN-US>dev</span>的会话号不同，则返回无终端错误信息。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCSPGRP</span></u>:
|
||
// </span>实现库函数<span lang=EN-US>tcsetpgrp()</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US>
|
||
if ((<u><span style='color:blue'>current</span></u>->tty < 0) ||</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US>
|
||
(<u><span style='color:blue'>current</span></u>->tty != dev) ||</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>212</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'>213</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>ENOTTY</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后我们就从用户缓冲区中取得欲设置的进程组号，并对该组号的有效性进行验证。如果组</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号<span lang=EN-US>pgrp</span>小于<span
|
||
lang=EN-US>0</span>，则返回无效组号错误信息；如果<span lang=EN-US> pgrp</span>的会话号与当前进程的不同，则返回</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>许可错误信息。否则我们可以设中终端的进程组号为<span
|
||
lang=EN-US>prgp</span>。此时<span lang=EN-US>prgp</span>成为前台进程组。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
|
||
lang=EN-US>
|
||
pgrp=<u><span style='color:blue'>get_fs_long</span></u>((unsigned long *) arg);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
|
||
lang=EN-US>
|
||
if (pgrp < 0)</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'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>session_of_pgrp</span></u>(pgrp) != <u><span
|
||
style='color:blue'>current</span></u>->session)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EPERM</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
|
||
lang=EN-US>
|
||
tty->pgrp =
|
||
pgrp;
|
||
</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
|
||
lang=EN-US>
|
||
return
|
||
0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回输出队列中还未送出的字符数。首先验证用户缓冲区长度，然后复制队列中字符数给用户。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>此时参数<span lang=EN-US>arg</span>是用户缓冲区指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCOUTQ</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>verify_area</span></u>((void *) arg,4);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>put_fs_long</span></u>(<u><span style='color:blue'>CHARS</span></u>(tty->write_q),(unsigned
|
||
long *) arg);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回输入队列中还未读取的字符数。首先验证用户缓冲区长度，然后复制队列中字符数给用户。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>此时参数<span lang=EN-US>arg</span>是用户缓冲区指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCINQ</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>verify_area</span></u>((void *) arg,4);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>put_fs_long</span></u>(<u><span style='color:blue'>CHARS</span></u>(tty->secondary),</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US>
|
||
(unsigned long *) arg);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>模拟终端输入操作。该命令以一个指向字符的指针作为参数，并假设该字符是在终端上键入的。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用户必须在该控制终端上具有超级用户权限或具有读许可权限。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US> case
|
||
<u><span style='color:blue'>TIOCSTI</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b> /* </span>未实现<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>读取终端设备窗口大小信息（参见<span
|
||
lang=EN-US>termios.h</span>中的<span lang=EN-US>winsize</span>结构）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCGWINSZ</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置终端设备窗口大小信息（参见<span
|
||
lang=EN-US>winsize</span>结构）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCSWINSZ</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回<span lang=EN-US>MODEM</span>状态控制引线的当前状态比特位标志集（参见<span
|
||
lang=EN-US>termios.h</span>中<span lang=EN-US>185 -- 196</span>行）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>236</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCMGET</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>237</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not
|
||
implemented */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置单个<span lang=EN-US>modem</span>状态控制引线的状态（<span
|
||
lang=EN-US>true</span>或<span lang=EN-US>false</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCMBIS</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>239</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>复位单个<span lang=EN-US>MODEM</span>状态控制引线的状态。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>240</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCMBIC</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
|
||
lang=EN-US> return
|
||
-<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置<span lang=EN-US>MODEM</span>状态引线的状态。如果某一比特位置位，则<span
|
||
lang=EN-US>modem</span>对应的状态引线将置为有效。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCMSET</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>读取软件载波检测标志（<span
|
||
lang=EN-US>1 - </span>开启；<span lang=EN-US>0 - </span>关闭）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCGSOFTCAR</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设置软件载波检测标志（<span
|
||
lang=EN-US>1 - </span>开启；<span lang=EN-US>0 - </span>关闭）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TIOCSSOFTCAR</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>; <b><i>/* not implemented
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
|
||
lang=EN-US> default:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>249</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'>250</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>252</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>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|