rdev.c 1.1 KB

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * rdev - print device node associated with a filesystem
  4. *
  5. * Copyright (c) 2008 Nuovation System Designs, LLC
  6. * Grant Erickson <gerickson@nuovations.com>
  7. *
  8. * Licensed under GPLv2, see file LICENSE in this source tree.
  9. */
  10. //config:config RDEV
  11. //config: bool "rdev (2.1 kb)"
  12. //config: default y
  13. //config: help
  14. //config: Print the device node associated with the filesystem mounted at '/'.
  15. //applet:IF_RDEV(APPLET_NOEXEC(rdev, rdev, BB_DIR_USR_SBIN, BB_SUID_DROP, rdev))
  16. //kbuild:lib-$(CONFIG_RDEV) += rdev.o
  17. //usage:#define rdev_trivial_usage
  18. //usage: ""
  19. //usage:#define rdev_full_usage "\n\n"
  20. //usage: "Print the device node associated with the filesystem mounted at '/'"
  21. //usage:
  22. //usage:#define rdev_example_usage
  23. //usage: "$ rdev\n"
  24. //usage: "/dev/mtdblock9 /\n"
  25. #include "libbb.h"
  26. int rdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  27. int rdev_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  28. {
  29. const char *root_device = find_block_device("/");
  30. if (root_device) {
  31. printf("%s /\n", root_device);
  32. return EXIT_SUCCESS;
  33. }
  34. return EXIT_FAILURE;
  35. }