console19.txt

来自「linux/kd.h文件中介绍了ioctl函数能够使用的命令」· 文本 代码 · 共 49 行

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

	#define ERROR -1

	void main()
	{
          int fd;
          struct vt_mode mode;

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

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

          if (ioctl(fd, VT_GETMODE, &mode) == ERROR) {
             perror("ioctl");
	     close(fd);
	     exit(ERROR);
          }

          printf("Modes of active VT:\n");

          if (mode.mode == VT_AUTO) printf("Automatic VT switching\n");
          else if (mode.mode == VT_PROCESS) 
	     printf("Process controls switching.\n");
	  else if (mode.mode == VT_ACKACQ) 
             printf("Acknowledgement of switches.\n");
          else printf("mode == %d\n", mode.mode);

          if (mode.waitv) printf("Will wait on writes if not active.\n");
          else printf("Will not wait on writes even when not active.\n");

          printf("Signal number to release on release request: %d\n",
                 mode.relsig);

          printf("Signal number to raise on acquisition: %d\n",
                 mode.acqsig);

          close(fd);
      }