Keyboard detection under Linux

In other words, it's just a keyboard test that's good trouble. I still know too little ...

#include  <stdio.h> #include  <stdlib.h> #include  <unistd.h> #include  < errno.h> #include  <fcntl.h> #include  <stdio.h> #include  <termios.h> #include  <unistd.h> #include  <string.h> #define  key_esc 27void init_keyboard (); void  close_keyboard (); Int kbhit (); Int readch (); /*  correlation function Declaration  */static struct  termios initial_settings, new_settings;static int peek_character = -1;          /*  a function to test if a key is pressed  *//*  detects keyboard keys  */int  kbhit () {    char ch;    int nread;     if  ( peek_character != -1 )          return (1);     new_settings.c_cc[vmin] = 0;    tcsetattr (  0, tcsanow, &new_settings )     nread = read ( 0, &ch, 1 );     new_settings.c_cc[vmin] = 1;    tcsetattr ( 0,  tcsanow, &new_settings );    if  ( nread == 1 )     {        peek_character = ch;         return (1);     }    return (0) ;} The/*  is used to receive the pressed key and peek_character = -1 the recovery status  */int readch () {    char  ch;    if  ( peek_character != -1 )     {         ch = peek_character;         peek_character = -1;        return (CH);     }     read ( 0, &ch, 1 );     return (ch);} /*  Configuration terminal function  */void init_keyboard () {    tcgetattr ( 0, &initial_ settings );     new_settings = initial_settings;    new_ settings.c_lflag &= ~icanon;    new_settings.c_lflag &= ~echo;     new_settings.c_lflag &= ~isig;    new_settings.c_cc[ vmin] = 1;    new_settings.c_cc[vtime] = 0;     Tcsetattr ( 0, TCSANOW, &new_settings );} Void close_keyboard () {    tcsetattr ( 0, tcsanow, &initial_settings  );} Int main (int argc, char const *argv[]) {    int ch =  0;    init_keyboard ();     printf (  "you can put esc to quit!\n"  );     while   ( ch != 27 )     {         if  ( kbhit ()  )         {     &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;CH&NBSP;=&NBSP;READCH ();             if  ( ch != 27 )                  printf (  "you put %c !  only put esc can quit! \n ", ch );         }    }    close_keyboard ();     return  0;}

Reference:

1. http://blog.163.com/liang_w_yan/blog/static/210657088201332444016981/

Keyboard detection under Linux