1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <unistd.h>
 4
 5 #define TTY_PATH            "/dev/tty"
 6 #define STTY_US             "stty raw -echo -F "
 7 #define STTY_DEF            "stty -raw echo -F "
 8
 9 #define UNUSED_PARAMTER(X)    (void)(X)
10
11 static char get_char( void )
12 {
13     fd_set rfds;
14     struct timeval tv;
15     char input_char = 0;
16
17     FD_ZERO(&rfds);
18     FD_SET(0, &rfds);
19
20     /**
21      * Set wait time
22      */
23     //tv.tv_sec = 0;　　　　//seconds
24     //tv.tv_usec = 500;　　//microseconds
25
26     /*Check for keyboard input.*/
27     if (select(1, &rfds, NULL, NULL, &tv) > 0)
28         input_char = getchar();
29
30     return input_char;
31 }
32
33 char nonblocking_input( void )
34 {
35     char input_char;
36
37     system(STTY_US TTY_PATH)；     //Prohibit echoing，ignoring carriage returns
38
39     usleep(100);
40     input_char = get_char();
41
42     system(STTY_DEF TTY_PATH);    //Turn on echo and don't ignore carriage return
43
44     return input_char;
45 }
46
47 int main(int argc, char **argv)
48 {
49     UNUSED_PARAMTER(argc);
50     UNUSED_PARAMTER(argv);
51
52     char input_char;
53
54     input_char = nonblocking_input();
55
56 　　 printf("\n\tYour input is %c!\n", input_char);
57 　　 printf("\nApplication finish.\n\n");
58
59 　　 return 0;
60 }    

 1 #include <stdio.h>
 2 #include <fcntl.h>
 3 #include <termios.h>
 4 #include <unistd.h>
 5
 6 #define UNUSED_PARAMTER(X)    (void)(X)
 7
 8 char nonblocking_input(void)
 9 {
10     char input_ch;
11     struct termios newt, oldt;
12
13     int tty = open("/dev/tty", O_RDONLY);    //Open control terminal
14
15     tcgetattr(tty, &oldt);            //Get terminal properties
16     newt = oldt;
17
18     //Set characters are not buffered(~ICANON) and do not echo(~ECHO).
19     //You can also choose only one of them.
20     newt.c_lflag &= ~( ICANON | ECHO );
21     tcsetattr(tty, TCSANOW, &newt);
22
23     read(tty, &input_ch, 1);
24     tcsetattr(tty, TCSANOW, &oldt);        //Restore terminal properties
25
26     return input_ch;
27 }
28
29 int main(int argc, char **argv)
30 {
31     UNUSED_PARAMTER(argc);
32     UNUSED_PARAMTER(argv);
33
34     char input_char;
35
36     input_char = nonblocking_input();
37
38     printf("\n\tYour input is %c!\n", input_char);
39     printf("\nApplication finish.\n\n");
40
41     return 0;
42 }