tty_ioctl.c

linux字符驱动源码

 <a name=L86 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L86">86</a>                 int flag;
 <a name=L87 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L87">87</a>                 int present[<a href="ident?v=0.97;i=NR_TASKS">NR_TASKS</a>];
 <a name=L88 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L88">88</a>                 struct <a href="ident?v=0.97;i=task_struct">task_struct</a> tasks[<a href="ident?v=0.97;i=NR_TASKS">NR_TASKS</a>];
 <a name=L89 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L89">89</a>         };
 <a name=L90 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L90">90</a>         struct tstruct *ts = (struct tstruct *)arg;
 <a name=L91 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L91">91</a>         struct <a href="ident?v=0.97;i=task_struct">task_struct</a> **p;
 <a name=L92 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L92">92</a>         char *c, *d;
 <a name=L93 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L93">93</a>         int i, n = 0;
 <a name=L94 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L94">94</a>         
 <a name=L95 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L95">95</a>         <a href="ident?v=0.97;i=verify_area">verify_area</a>((void *)arg, sizeof(struct tstruct));
 <a name=L96 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L96">96</a>                 
 <a name=L97 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L97">97</a>         for (p = &amp;<a href="ident?v=0.97;i=FIRST_TASK">FIRST_TASK</a> ; p &lt;= &amp;<a href="ident?v=0.97;i=LAST_TASK">LAST_TASK</a> ; p++, n++)
 <a name=L98 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L98">98</a>                 if (*p)
 <a name=L99 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L99">99</a>                 {
<a name=L100 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L100">100</a>                         c = (char *)(*p);
<a name=L101 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L101">101</a>                         d = (char *)(ts-&gt;tasks+n);
<a name=L102 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L102">102</a>                         for (i=0 ; i&lt;sizeof(struct <a href="ident?v=0.97;i=task_struct">task_struct</a>) ; i++)
<a name=L103 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L103">103</a>                                 <a href="ident?v=0.97;i=put_fs_byte">put_fs_byte</a>(*c++, d++);
<a name=L104 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L104">104</a>                         <a href="ident?v=0.97;i=put_fs_long">put_fs_long</a>(1, (unsigned long *)(ts-&gt;present+n));
<a name=L105 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L105">105</a>                 }
<a name=L106 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L106">106</a>                 else    
<a name=L107 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L107">107</a>                         <a href="ident?v=0.97;i=put_fs_long">put_fs_long</a>(0, (unsigned long *)(ts-&gt;present+n));
<a name=L108 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L108">108</a>         return(0);                      
<a name=L109 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L109">109</a> }
<a name=L110 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L110">110</a> 
<a name=L111 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L111">111</a> static int <a href="ident?v=0.97;i=get_termios">get_termios</a>(struct <a href="ident?v=0.97;i=tty_struct">tty_struct</a> * tty, struct <a href="ident?v=0.97;i=termios">termios</a> * <a href="ident?v=0.97;i=termios">termios</a>)
<a name=L112 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L112">112</a> {
<a name=L113 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L113">113</a>         int i;
<a name=L114 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L114">114</a> 
<a name=L115 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L115">115</a>         <a href="ident?v=0.97;i=verify_area">verify_area</a>(<a href="ident?v=0.97;i=termios">termios</a>, sizeof (*<a href="ident?v=0.97;i=termios">termios</a>));
<a name=L116 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L116">116</a>         for (i=0 ; i&lt; (sizeof (*<a href="ident?v=0.97;i=termios">termios</a>)) ; i++)
<a name=L117 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L117">117</a>                 <a href="ident?v=0.97;i=put_fs_byte">put_fs_byte</a>( ((char *)&amp;tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>)[i] , i+(char *)<a href="ident?v=0.97;i=termios">termios</a> );
<a name=L118 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L118">118</a>         return 0;
<a name=L119 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L119">119</a> }
<a name=L120 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L120">120</a> 
<a name=L121 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L121">121</a> static int <a href="ident?v=0.97;i=set_termios">set_termios</a>(struct <a href="ident?v=0.97;i=tty_struct">tty_struct</a> * tty, struct <a href="ident?v=0.97;i=termios">termios</a> * <a href="ident?v=0.97;i=termios">termios</a>,
<a name=L122 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L122">122</a>                         int channel)
<a name=L123 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L123">123</a> {
<a name=L124 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L124">124</a>         int i;
<a name=L125 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L125">125</a>         unsigned short old_cflag = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cflag;
<a name=L126 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L126">126</a> 
<a name=L127 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L127">127</a>         <b><i>/* If we try to set the state of terminal and we're not in the</i></b>
<a name=L128 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L128">128</a> <b><i>           foreground, send a SIGTTOU.  If the signal is blocked or</i></b>
<a name=L129 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L129">129</a> <b><i>           ignored, go ahead and perform the operation.  POSIX 7.2) */</i></b>
<a name=L130 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L130">130</a>         if ((<a href="ident?v=0.97;i=current">current</a>-&gt;tty == channel) &amp;&amp;
<a name=L131 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L131">131</a>              (tty-&gt;pgrp != <a href="ident?v=0.97;i=current">current</a>-&gt;pgrp)) {
<a name=L132 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L132">132</a>                 if (<a href="ident?v=0.97;i=is_orphaned_pgrp">is_orphaned_pgrp</a>(<a href="ident?v=0.97;i=current">current</a>-&gt;pgrp))
<a name=L133 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L133">133</a>                         return -<a href="ident?v=0.97;i=EIO">EIO</a>;
<a name=L134 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L134">134</a>                 if (!<a href="ident?v=0.97;i=is_ignored">is_ignored</a>(<a href="ident?v=0.97;i=SIGTTOU">SIGTTOU</a>))
<a name=L135 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L135">135</a>                         return <a href="ident?v=0.97;i=tty_signal">tty_signal</a>(<a href="ident?v=0.97;i=SIGTTOU">SIGTTOU</a>, tty);
<a name=L136 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L136">136</a>         }
<a name=L137 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L137">137</a>         for (i=0 ; i&lt; (sizeof (*<a href="ident?v=0.97;i=termios">termios</a>)) ; i++)
<a name=L138 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L138">138</a>                 ((char *)&amp;tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>)[i]=<a href="ident?v=0.97;i=get_fs_byte">get_fs_byte</a>(i+(char *)<a href="ident?v=0.97;i=termios">termios</a>);
<a name=L139 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L139">139</a>         if (<a href="ident?v=0.97;i=IS_A_SERIAL">IS_A_SERIAL</a>(channel) &amp;&amp; tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cflag != old_cflag)
<a name=L140 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L140">140</a>                 <a href="ident?v=0.97;i=change_speed">change_speed</a>(channel-64);
<a name=L141 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L141">141</a>         return 0;
<a name=L142 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L142">142</a> }
<a name=L143 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L143">143</a> 
<a name=L144 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L144">144</a> static int <a href="ident?v=0.97;i=get_termio">get_termio</a>(struct <a href="ident?v=0.97;i=tty_struct">tty_struct</a> * tty, struct <a href="ident?v=0.97;i=termio">termio</a> * <a href="ident?v=0.97;i=termio">termio</a>)
<a name=L145 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L145">145</a> {
<a name=L146 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L146">146</a>         int i;
<a name=L147 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L147">147</a>         struct <a href="ident?v=0.97;i=termio">termio</a> tmp_termio;
<a name=L148 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L148">148</a> 
<a name=L149 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L149">149</a>         <a href="ident?v=0.97;i=verify_area">verify_area</a>(<a href="ident?v=0.97;i=termio">termio</a>, sizeof (*<a href="ident?v=0.97;i=termio">termio</a>));
<a name=L150 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L150">150</a>         tmp_termio.c_iflag = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_iflag;
<a name=L151 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L151">151</a>         tmp_termio.c_oflag = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_oflag;
<a name=L152 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L152">152</a>         tmp_termio.c_cflag = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cflag;
<a name=L153 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L153">153</a>         tmp_termio.c_lflag = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_lflag;
<a name=L154 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L154">154</a>         tmp_termio.c_line = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_line;
<a name=L155 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L155">155</a>         for(i=0 ; i &lt; <a href="ident?v=0.97;i=NCC">NCC</a> ; i++)
<a name=L156 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L156">156</a>                 tmp_termio.c_cc[i] = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cc[i];
<a name=L157 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L157">157</a>         for (i=0 ; i&lt; (sizeof (*<a href="ident?v=0.97;i=termio">termio</a>)) ; i++)
<a name=L158 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L158">158</a>                 <a href="ident?v=0.97;i=put_fs_byte">put_fs_byte</a>( ((char *)&amp;tmp_termio)[i] , i+(char *)<a href="ident?v=0.97;i=termio">termio</a> );
<a name=L159 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L159">159</a>         return 0;
<a name=L160 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L160">160</a> }
<a name=L161 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L161">161</a> 
<a name=L162 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L162">162</a> <b><i>/*</i></b>
<a name=L163 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L163">163</a> <b><i> * This only works as the 386 is low-byte-first</i></b>
<a name=L164 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L164">164</a> <b><i> */</i></b>
<a name=L165 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L165">165</a> static int <a href="ident?v=0.97;i=set_termio">set_termio</a>(struct <a href="ident?v=0.97;i=tty_struct">tty_struct</a> * tty, struct <a href="ident?v=0.97;i=termio">termio</a> * <a href="ident?v=0.97;i=termio">termio</a>,
<a name=L166 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L166">166</a>                         int channel)
<a name=L167 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L167">167</a> {
<a name=L168 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L168">168</a>         int i;
<a name=L169 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L169">169</a>         struct <a href="ident?v=0.97;i=termio">termio</a> tmp_termio;
<a name=L170 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L170">170</a>         unsigned short old_cflag = tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cflag;
<a name=L171 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L171">171</a> 
<a name=L172 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L172">172</a>         if ((<a href="ident?v=0.97;i=current">current</a>-&gt;tty == channel) &amp;&amp;
<a name=L173 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L173">173</a>             (tty-&gt;pgrp &gt; 0) &amp;&amp;
<a name=L174 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L174">174</a>             (tty-&gt;pgrp != <a href="ident?v=0.97;i=current">current</a>-&gt;pgrp)) {
<a name=L175 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L175">175</a>                 if (<a href="ident?v=0.97;i=is_orphaned_pgrp">is_orphaned_pgrp</a>(<a href="ident?v=0.97;i=current">current</a>-&gt;pgrp))
<a name=L176 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L176">176</a>                         return -<a href="ident?v=0.97;i=EIO">EIO</a>;
<a name=L177 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L177">177</a>                 if (!<a href="ident?v=0.97;i=is_ignored">is_ignored</a>(<a href="ident?v=0.97;i=SIGTTOU">SIGTTOU</a>))
<a name=L178 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L178">178</a>                         return <a href="ident?v=0.97;i=tty_signal">tty_signal</a>(<a href="ident?v=0.97;i=SIGTTOU">SIGTTOU</a>, tty);
<a name=L179 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L179">179</a>         }
<a name=L180 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L180">180</a>         for (i=0 ; i&lt; (sizeof (*<a href="ident?v=0.97;i=termio">termio</a>)) ; i++)
<a name=L181 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L181">181</a>                 ((char *)&amp;tmp_termio)[i]=<a href="ident?v=0.97;i=get_fs_byte">get_fs_byte</a>(i+(char *)<a href="ident?v=0.97;i=termio">termio</a>);
<a name=L182 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L182">182</a>         *(unsigned short *)&amp;tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_iflag = tmp_termio.c_iflag;
<a name=L183 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L183">183</a>         *(unsigned short *)&amp;tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_oflag = tmp_termio.c_oflag;
<a name=L184 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L184">184</a>         *(unsigned short *)&amp;tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cflag = tmp_termio.c_cflag;
<a name=L185 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L185">185</a>         *(unsigned short *)&amp;tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_lflag = tmp_termio.c_lflag;
<a name=L186 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L186">186</a>         tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_line = tmp_termio.c_line;
<a name=L187 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L187">187</a>         for(i=0 ; i &lt; <a href="ident?v=0.97;i=NCC">NCC</a> ; i++)
<a name=L188 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L188">188</a>                 tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cc[i] = tmp_termio.c_cc[i];
<a name=L189 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L189">189</a>         if (<a href="ident?v=0.97;i=IS_A_SERIAL">IS_A_SERIAL</a>(channel) &amp;&amp; tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cflag != old_cflag)
<a name=L190 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L190">190</a>                 <a href="ident?v=0.97;i=change_speed">change_speed</a>(channel-64);
<a name=L191 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L191">191</a>         return 0;
<a name=L192 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L192">192</a> }
<a name=L193 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L193">193</a> 
<a name=L194 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L194">194</a> static int <a href="ident?v=0.97;i=set_window_size">set_window_size</a>(struct <a href="ident?v=0.97;i=tty_struct">tty_struct</a> * tty, struct <a href="ident?v=0.97;i=winsize">winsize</a> * ws)
<a name=L195 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L195">195</a> {
<a name=L196 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L196">196</a>         int i,changed;
<a name=L197 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L197">197</a>         char c, * tmp;
<a name=L198 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L198">198</a> 
<a name=L199 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L199">199</a>         if (!ws)
<a name=L200 href="source/kernel/chr_drv/tty_ioctl.c?v=0.97#L200">200</a>                 return -<a href="ident?v=0.97;i=EINVAL">EINVAL</a>;