chvt.c 792 B

123456789101112131415161718192021222324252627282930313233
  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * Mini chvt implementation for busybox
  4. *
  5. * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  6. *
  7. * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  8. */
  9. #include "libbb.h"
  10. /* From <linux/vt.h> */
  11. enum {
  12. VT_ACTIVATE = 0x5606, /* make vt active */
  13. VT_WAITACTIVE = 0x5607 /* wait for vt active */
  14. };
  15. int chvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  16. int chvt_main(int argc, char **argv)
  17. {
  18. int fd, num;
  19. if (argc != 2) {
  20. bb_show_usage();
  21. }
  22. fd = get_console_fd();
  23. num = xatou_range(argv[1], 1, 63);
  24. /* double cast suppresses "cast to ptr from int of different size" */
  25. xioctl(fd, VT_ACTIVATE, (void *)(ptrdiff_t)num);
  26. xioctl(fd, VT_WAITACTIVE, (void *)(ptrdiff_t)num);
  27. return EXIT_SUCCESS;
  28. }