console2.txt

linux/kd.h文件中介绍了ioctl函数能够使用的命令

Example:
	#include <stdio.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <signal.h>
	#include <sys/stat.h>
	#include <linux/kd.h>
	#include <sys/types.h>
	#include <sys/ioctl.h>

	#define ERROR -1

	int fd; /* File descriptor for console (/dev/tty/) */

	void sighandler(int signum);

	void main()
	{
	  int i;

          /* To be used as the fd in ioctl(). */
	  if ((fd = open("/dev/console", O_NOCTTY)) == ERROR) {
	     perror("open");
	     exit(ERROR);
	  }

	  signal(SIGINT,  sighandler);
	  signal(SIGTERM, sighandler);
	  signal(SIGQUIT, sighandler);
	  signal(SIGTSTP, sighandler);

	  printf("w00w00!\n\n");
	  printf("To exit hit Control-C.\n");

	  while (1) {
	     for (i = 0x01; i <= 0x04; i++) {
	         /* We do this because there is no LED for 0x03. */
        	 if (i == 0x03) continue; 

	         usleep(50000);

	         if ((ioctl(fd, KDSETLED, i)) == ERROR) {
	            perror("ioctl");
	            close(fd);
	            exit(ERROR);
	         }
	     }
	  }

	  close(fd);
	}

	void sighandler(int signum)
	{
	  /* Turn off all leds. No LED == 0x0. */
	  if ((ioctl(fd, KDSETLED, 0x0)) == ERROR) { 
	    perror("ioctl");
	    close(fd);
	    exit(ERROR);
	  }

	  printf("\nw00w00!\n");
	  close(fd);
	  exit(0);
	}