code:ttystty - ikarishinjieva/unixV6-code-analyze-chs GitHub Wiki

8571 /* Common code for gtty and stty functions on typewriters.

8572  * If v is non-zero then gtty is being done and information

8573  * is passed back therein;

8574  * if it is zero stty is being done and the input inform-

8575  * ation is in the u_arg array.

8576  */

8577 ttystty(atp, av)

8578 int *atp, *av;

8579 {

8580     register *tp, *v;

8581     tp = atp;

8582     if(v = av) {

8583          *v++ = tp->t_speeds;

8584          v->lobyte = tp->t_erase;

8585          v->hibyte = tp->t_kill;

8586          v[1] = tp->t_flags;

8587          return(1);

gtty调用的部分

• 向v中 传入 tty 参数
• 返回1

8588     }

8589     wflushtty(tp);

8590     v = u.u_arg;

8591     tp->t_speeds = *v++;

8592     tp->t_erase = v->lobyte;

8593     tp->t_kill = v->hibyte;

8594     tp->t_flags = v[1];

8595     return(0);

stty调用的部分

• "清空" tp 的队列
• 从v中 设置 tty 参数
• 返回0

8596 }

8597 /* ------------------------- */

8598

8599

• code:klsgtty