📄 tty_io.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/chr_drv/tty_io.c</title><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>source navigation</i></b>] [<a href="diff/kernel/chr_drv/tty_io.c?v=0.97">diff markup</a>] [<a href="ident?v=0.97">identifier search</a>] [<a href="search?v=0.97">freetext search</a>] [<a href="find?v=0.97">file search</a>]</div><h1 align=center> <a href="http:/"> Oldlinux</a> <a href="http:blurb.html"> Cross Reference</a><br> <a href="source/?v=0.97">Linux</a>/<a href="source/kernel/?v=0.97">kernel</a>/<a href="source/kernel/chr_drv/?v=0.97">chr_drv</a>/<a href="source/kernel/chr_drv/tty_io.c?v=0.97">tty_io.c</a></h1><div align=center> <b>Version:</b> [<a href="source/kernel/chr_drv/tty_io.c?v=1.0">1.0</a>] [<a href="source/kernel/chr_drv/tty_io.c?v=0.99.11">0.99.11</a>] [<a href="source/kernel/chr_drv/tty_io.c?v=0.99">0.99</a>] [<a href="source/kernel/chr_drv/tty_io.c?v=0.98">0.98</a>] [<b><i>0.97</i></b>] [<a href="source/kernel/chr_drv/tty_io.c?v=0.96a">0.96a</a>] [<a href="source/kernel/chr_drv/tty_io.c?v=0.95">0.95</a>] [<a href="source/kernel/chr_drv/tty_io.c?v=0.12">0.12</a>] [<a href="source/kernel/chr_drv/tty_io.c">0.11</a>] [<a href="source/kernel/chr_drv/tty_io.c?v=0.01">0.01</a>] <br> <b>Architecture:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/kernel/chr_drv/tty_io.c?v=0.97#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/kernel/chr_drv/tty_io.c?v=0.97#L2">2</a> <b><i> * linux/kernel/tty_io.c</i></b> <a name=L3 href="source/kernel/chr_drv/tty_io.c?v=0.97#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/kernel/chr_drv/tty_io.c?v=0.97#L4">4</a> <b><i> * Copyright (C) 1991, 1992 Linus Torvalds</i></b> <a name=L5 href="source/kernel/chr_drv/tty_io.c?v=0.97#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/kernel/chr_drv/tty_io.c?v=0.97#L6">6</a> <a name=L7 href="source/kernel/chr_drv/tty_io.c?v=0.97#L7">7</a> <b><i>/*</i></b> <a name=L8 href="source/kernel/chr_drv/tty_io.c?v=0.97#L8">8</a> <b><i> * 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles</i></b> <a name=L9 href="source/kernel/chr_drv/tty_io.c?v=0.97#L9">9</a> <b><i> * or rs-channels. It also implements echoing, cooked mode etc.</i></b> <a name=L10 href="source/kernel/chr_drv/tty_io.c?v=0.97#L10">10</a> <b><i> *</i></b> <a name=L11 href="source/kernel/chr_drv/tty_io.c?v=0.97#L11">11</a> <b><i> * Kill-line thanks to John T Kohl, who also corrected VMIN = VTIME = 0.</i></b> <a name=L12 href="source/kernel/chr_drv/tty_io.c?v=0.97#L12">12</a> <b><i> */</i></b> <a name=L13 href="source/kernel/chr_drv/tty_io.c?v=0.97#L13">13</a> <a name=L14 href="source/kernel/chr_drv/tty_io.c?v=0.97#L14">14</a> #include <linux/types.h> <a name=L15 href="source/kernel/chr_drv/tty_io.c?v=0.97#L15">15</a> #include <linux/errno.h> <a name=L16 href="source/kernel/chr_drv/tty_io.c?v=0.97#L16">16</a> #include <linux/signal.h> <a name=L17 href="source/kernel/chr_drv/tty_io.c?v=0.97#L17">17</a> #include <linux/fcntl.h> <a name=L18 href="source/kernel/chr_drv/tty_io.c?v=0.97#L18">18</a> #include <linux/sched.h> <a name=L19 href="source/kernel/chr_drv/tty_io.c?v=0.97#L19">19</a> #include <linux/tty.h> <a name=L20 href="source/kernel/chr_drv/tty_io.c?v=0.97#L20">20</a> #include <linux/ctype.h> <a name=L21 href="source/kernel/chr_drv/tty_io.c?v=0.97#L21">21</a> <a name=L22 href="source/kernel/chr_drv/tty_io.c?v=0.97#L22">22</a> #include <asm/io.h> <a name=L23 href="source/kernel/chr_drv/tty_io.c?v=0.97#L23">23</a> #include <asm/segment.h> <a name=L24 href="source/kernel/chr_drv/tty_io.c?v=0.97#L24">24</a> #include <asm/system.h> <a name=L25 href="source/kernel/chr_drv/tty_io.c?v=0.97#L25">25</a> <a name=L26 href="source/kernel/chr_drv/tty_io.c?v=0.97#L26">26</a> #include <sys/kd.h> <a name=L27 href="source/kernel/chr_drv/tty_io.c?v=0.97#L27">27</a> #include "<a href="source/kernel/chr_drv/vt_kern.h?v=0.97">vt_kern.h</a>" <a name=L28 href="source/kernel/chr_drv/tty_io.c?v=0.97#L28">28</a> <a name=L29 href="source/kernel/chr_drv/tty_io.c?v=0.97#L29">29</a> #define <a href="ident?v=0.97;i=QUEUES">QUEUES</a> (3*(<a href="ident?v=0.97;i=NR_CONSOLES">NR_CONSOLES</a>+<a href="ident?v=0.97;i=NR_SERIALS">NR_SERIALS</a>+2*<a href="ident?v=0.97;i=NR_PTYS">NR_PTYS</a>)) <a name=L30 href="source/kernel/chr_drv/tty_io.c?v=0.97#L30">30</a> static struct <a href="ident?v=0.97;i=tty_queue">tty_queue</a> * <a href="ident?v=0.97;i=tty_queues">tty_queues</a>; <a name=L31 href="source/kernel/chr_drv/tty_io.c?v=0.97#L31">31</a> struct <a href="ident?v=0.97;i=tty_struct">tty_struct</a> <a href="ident?v=0.97;i=tty_table">tty_table</a>[256]; <a name=L32 href="source/kernel/chr_drv/tty_io.c?v=0.97#L32">32</a> <a name=L33 href="source/kernel/chr_drv/tty_io.c?v=0.97#L33">33</a> #define <a href="ident?v=0.97;i=con_queues">con_queues</a> <a href="ident?v=0.97;i=tty_queues">tty_queues</a> <a name=L34 href="source/kernel/chr_drv/tty_io.c?v=0.97#L34">34</a> #define <a href="ident?v=0.97;i=rs_queues">rs_queues</a> ((3*<a href="ident?v=0.97;i=NR_CONSOLES">NR_CONSOLES</a>) + <a href="ident?v=0.97;i=tty_queues">tty_queues</a>) <a name=L35 href="source/kernel/chr_drv/tty_io.c?v=0.97#L35">35</a> #define <a href="ident?v=0.97;i=mpty_queues">mpty_queues</a> ((3*(<a href="ident?v=0.97;i=NR_CONSOLES">NR_CONSOLES</a>+<a href="ident?v=0.97;i=NR_SERIALS">NR_SERIALS</a>)) + <a href="ident?v=0.97;i=tty_queues">tty_queues</a>) <a name=L36 href="source/kernel/chr_drv/tty_io.c?v=0.97#L36">36</a> #define <a href="ident?v=0.97;i=spty_queues">spty_queues</a> ((3*(<a href="ident?v=0.97;i=NR_CONSOLES">NR_CONSOLES</a>+<a href="ident?v=0.97;i=NR_SERIALS">NR_SERIALS</a>+<a href="ident?v=0.97;i=NR_PTYS">NR_PTYS</a>)) + <a href="ident?v=0.97;i=tty_queues">tty_queues</a>) <a name=L37 href="source/kernel/chr_drv/tty_io.c?v=0.97#L37">37</a> <a name=L38 href="source/kernel/chr_drv/tty_io.c?v=0.97#L38">38</a> #define <a href="ident?v=0.97;i=con_table">con_table</a> <a href="ident?v=0.97;i=tty_table">tty_table</a> <a name=L39 href="source/kernel/chr_drv/tty_io.c?v=0.97#L39">39</a> #define <a href="ident?v=0.97;i=rs_table">rs_table</a> (64+<a href="ident?v=0.97;i=tty_table">tty_table</a>) <a name=L40 href="source/kernel/chr_drv/tty_io.c?v=0.97#L40">40</a> #define <a href="ident?v=0.97;i=mpty_table">mpty_table</a> (128+<a href="ident?v=0.97;i=tty_table">tty_table</a>) <a name=L41 href="source/kernel/chr_drv/tty_io.c?v=0.97#L41">41</a> #define <a href="ident?v=0.97;i=spty_table">spty_table</a> (192+<a href="ident?v=0.97;i=tty_table">tty_table</a>) <a name=L42 href="source/kernel/chr_drv/tty_io.c?v=0.97#L42">42</a> <a name=L43 href="source/kernel/chr_drv/tty_io.c?v=0.97#L43">43</a> <b><i>/*</i></b> <a name=L44 href="source/kernel/chr_drv/tty_io.c?v=0.97#L44">44</a> <b><i> * fg_console is the current virtual console,</i></b> <a name=L45 href="source/kernel/chr_drv/tty_io.c?v=0.97#L45">45</a> <b><i> * redirect is the pseudo-tty that console output</i></b> <a name=L46 href="source/kernel/chr_drv/tty_io.c?v=0.97#L46">46</a> <b><i> * is redirected to if asked by TIOCCONS.</i></b> <a name=L47 href="source/kernel/chr_drv/tty_io.c?v=0.97#L47">47</a> <b><i> */</i></b> <a name=L48 href="source/kernel/chr_drv/tty_io.c?v=0.97#L48">48</a> int <a href="ident?v=0.97;i=fg_console">fg_console</a> = 0; <a name=L49 href="source/kernel/chr_drv/tty_io.c?v=0.97#L49">49</a> struct <a href="ident?v=0.97;i=tty_struct">tty_struct</a> * <a href="ident?v=0.97;i=redirect">redirect</a> = <a href="ident?v=0.97;i=NULL">NULL</a>; <a name=L50 href="source/kernel/chr_drv/tty_io.c?v=0.97#L50">50</a> <a name=L51 href="source/kernel/chr_drv/tty_io.c?v=0.97#L51">51</a> <b><i>/*</i></b> <a name=L52 href="source/kernel/chr_drv/tty_io.c?v=0.97#L52">52</a> <b><i> * these are the tables used by the machine code handlers.</i></b> <a name=L53 href="source/kernel/chr_drv/tty_io.c?v=0.97#L53">53</a> <b><i> * you can implement virtual consoles.</i></b> <a name=L54 href="source/kernel/chr_drv/tty_io.c?v=0.97#L54">54</a> <b><i> */</i></b> <a name=L55 href="source/kernel/chr_drv/tty_io.c?v=0.97#L55">55</a> struct <a href="ident?v=0.97;i=tty_queue">tty_queue</a> * <a href="ident?v=0.97;i=table_list">table_list</a>[] = { <a href="ident?v=0.97;i=NULL">NULL</a>, <a href="ident?v=0.97;i=NULL">NULL</a> }; <a name=L56 href="source/kernel/chr_drv/tty_io.c?v=0.97#L56">56</a> <a name=L57 href="source/kernel/chr_drv/tty_io.c?v=0.97#L57">57</a> void inline <a href="ident?v=0.97;i=put_tty_queue">put_tty_queue</a>(char c, struct <a href="ident?v=0.97;i=tty_queue">tty_queue</a> * queue) <a name=L58 href="source/kernel/chr_drv/tty_io.c?v=0.97#L58">58</a> { <a name=L59 href="source/kernel/chr_drv/tty_io.c?v=0.97#L59">59</a> int <a href="ident?v=0.97;i=head">head</a>; <a name=L60 href="source/kernel/chr_drv/tty_io.c?v=0.97#L60">60</a> unsigned long flags; <a name=L61 href="source/kernel/chr_drv/tty_io.c?v=0.97#L61">61</a> <a name=L62 href="source/kernel/chr_drv/tty_io.c?v=0.97#L62">62</a> __asm__ __volatile__(<i>"pushfl ; popl %0 ; cli"</i>:<i>"=r"</i> (flags)); <a name=L63 href="source/kernel/chr_drv/tty_io.c?v=0.97#L63">63</a> <a href="ident?v=0.97;i=head">head</a> = (queue-><a href="ident?v=0.97;i=head">head</a> + 1) & (<a href="ident?v=0.97;i=TTY_BUF_SIZE">TTY_BUF_SIZE</a>-1); <a name=L64 href="source/kernel/chr_drv/tty_io.c?v=0.97#L64">64</a> if (<a href="ident?v=0.97;i=head">head</a> != queue->tail) { <a name=L65 href="source/kernel/chr_drv/tty_io.c?v=0.97#L65">65</a> queue-><a href="ident?v=0.97;i=buf">buf</a>[queue-><a href="ident?v=0.97;i=head">head</a>] = c; <a name=L66 href="source/kernel/chr_drv/tty_io.c?v=0.97#L66">66</a> queue-><a href="ident?v=0.97;i=head">head</a> = <a href="ident?v=0.97;i=head">head</a>; <a name=L67 href="source/kernel/chr_drv/tty_io.c?v=0.97#L67">67</a> } <a name=L68 href="source/kernel/chr_drv/tty_io.c?v=0.97#L68">68</a> __asm__ __volatile__(<i>"pushl %0 ; popfl"</i>::<i>"r"</i> (flags));⌨️ 快捷键说明
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