No need to press ENTER to read input key value under Linux

Linux common input functions scanf and fgets are usually blocked:

1, if the user does not enter, the program will block waiting for the user input input, and require the user to enter the key to complete reading keyboard input.

2, the user input information, will be displayed on the screen.

The following code implements:

1, the user does not enter, then after the set time, the program will continue to run

2, the user input information will not be displayed on the screen

3, the program can not wait for carriage return, direct response to keyboard input

The code is as follows:

#include <stdio.h> #include<stdlib.h>#include<unistd.h>#defineTty_path "/dev/tty"#defineStty_us "STTY raw-echo-f"#defineStty_def "Stty-raw echo-f"#defineUnused_paramter (x) (void) (x)Static CharGet_char (void) {Fd_set RfDs; structTimeval TV; CharInput_char =0; Fd_zero (&RFDS); Fd_set (0, &RFDS); /** * Set wait time*///tv.tv_sec=0; Seconds//tv.tv_usec= -; Microseconds/*Check for keyboard input.*/    if(Select(1, &rfds, NULL, NULL, &AMP;TV) >0) Input_char=GetChar (); returnInput_char;} CharNonblocking_input (void ){    CharInput_char;    System (Stty_us Tty_path); Usleep (1xx); Input_char=Get_char ();    System (Stty_def Tty_path); returnInput_char;} intMainintargcChar**argv)    {Unused_paramter (ARGC);    Unused_paramter (argv); CharInput_char; Input_char=Nonblocking_input ();

printf ("\n\tyour input is%c!\n", Input_char);
printf ("\napplication finish.\n\n");

Return0;

}

No need to press ENTER to read input key value under Linux