console16.txt

linux/kd.h文件中介绍了ioctl函数能够使用的命令

Example:
	This will not work, sorry. But included as an example anyway. If
        anyone knows why this will not work, please let me know. I saw no
        indications as to why from following the signals in
        linux/kernel/exit.c, but it is possible I missed something.

	#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 fd;
          int signum = 2; /* Signal to accept keyboard input for. */
                          /* SIGINT == 2                          */

	  if ((fd = open("/dev/console", O_NOCTTY)) == ERROR) {
	     perror("open");
	     exit(ERROR);
	  }

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

          printf("Ignoring SIGINT (Ctrl-C) before call to ioctl().\n");
          signal(SIGINT, SIG_IGN);

          if (ioctl(fd, KDSIGACCEPT, signum) == ERROR) {
             perror("ioctl");
	     close(fd);
	     exit(ERROR);
          }

          printf("Signal is now being accepted. "
                 "Try aborting with Ctrl-C (this does not work). Hit enter.\n");
          
          getchar();
          printf("Well, you were supposed to abort rather than hit Enter.\n");

          close(fd);
      }