console5.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

	void main()
	{
          int i;
	  int fd;
	  int beep = (125 << 16) + 1591; /* This is the default beep. */


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

	  printf("w00w00!\n\n");

          for (i = 0; i <= 25; i++) { 
              if ((ioctl(fd, KDMKTONE, beep)) == ERROR) {
  	         perror("ioctl");
	         close(fd);
	         exit(ERROR);
	      }

              beep += 50;
              usleep(150000);
	  }

          /* Turn off the tone now. */
          if ((ioctl(fd, KDMKTONE, 0)) == ERROR) {
	     perror("ioctl");
	     close(fd);
	     exit(ERROR);
          }

	  close(fd);
	}