Linux练习（读取字符立即回显）

#include <stdio.h>

#include <termios.h>

int main()

{

        char s;

//        FILE *in;

//        FILE *out;

        struct termios initial_settings,new_settings;

//        in=fopen("/dev/tty","r");

//        out=fopen("/dev/tty","w");



        tcgetattr(fileno(stdin),&initial_settings);//保存原来的设置

        new_settings=initial_settings;　　　　//开始新终端控制设置

        new_settings.c_lflag &= ～ICANON;

        new_settings.c_lflag &= ～ECHO;

        new_settings.c_cc[VMIN] = 1;

        new_settings.c_cc[VTIME] = 0;

        if(tcsetattr(fileno(stdin),TCSANOW,&new_settings)!=0) //应用新的设置

                fprintf(stderr,"coutld not set attributes\n");



        do

        {

            s=fgetc(stdin);

            fprintf(stdout,"\nyou input %c\n",s);

        }while(s!='q');

        

        tcsetattr(fileno(stdin),TCSANOW,&initial_settings);//返回原来的设置

                

        return 0;

}