1.使用非阻塞方式获取标准输入

//首先&＃xff0c;我们先来看总的main函数框架
1 int main()
2 {
3 char c;
4 int i&＃61;0;
5
6 nonblock(NB_ENABLE);
7 while(!i)
8 {
9 usleep(1);
10 i&＃61;kbhit();
11 if (i!&＃61;0)
12 {
13 c&＃61;fgetc(stdin);
14 if (c&＃61;&＃61;&＃39;q&＃39;)
15 i&＃61;1;
16 else
17 i&＃61;0;
18 }
19
20 fprintf(stderr,"%d ",i);
21 }
22 printf("\n you hit %c. \n",c);
23 nonblock(NB_DISABLE);
24
25 return 0;
26 }

1 void nonblock(int state)
2 {
3 struct termios ttystate;
4
5 //get the terminal state
6 tcgetattr(STDIN_FILENO, &ttystate);
7
8 if (state&＃61;&＃61;NB_ENABLE)
9 {
10 //turn off canonical mode
11 ttystate.c_lflag &&＃61; ~ICANON;
12 //minimum of number input read.
13 ttystate.c_cc[VMIN] &＃61; 1;//有一个数据时就立刻返回
14 }
15 else if (state&＃61;&＃61;NB_DISABLE)
16 {
17 //turn on canonical mode
18 ttystate.c_lflag |&＃61; ICANON;
19 }
20 //set the terminal attributes.
21 tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
22
23 }

1 int kbhit()
2 {
3 struct timeval tv;
4 fd_set fds;
5 tv.tv_sec &＃61; 0;
6 tv.tv_usec &＃61; 0;
7 FD_ZERO(&fds);
8 FD_SET(STDIN_FILENO, &fds); //STDIN_FILENO is 0
9 select(STDIN_FILENO&＃43;1, &fds, NULL, NULL, &tv);
10 return FD_ISSET(STDIN_FILENO, &fds);
11 }

1 while(!kbhit())
2 {
3 //do certain operation..
4 }
5 //user hits enter.