sysrq.h 1.8 KB

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  1. /* -*- linux-c -*-
  2. *
  3. * $Id: sysrq.h,v 1.1.1.1 2007/06/12 07:27:16 eyryu Exp $
  4. *
  5. * Linux Magic System Request Key Hacks
  6. *
  7. * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  8. *
  9. * (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
  10. * overhauled to use key registration
  11. * based upon discusions in irc://irc.openprojects.net/#kernelnewbies
  12. */
  13. #ifndef _LINUX_SYSRQ_H
  14. #define _LINUX_SYSRQ_H
  15. struct pt_regs;
  16. struct tty_struct;
  17. /* Possible values of bitmask for enabling sysrq functions */
  18. /* 0x0001 is reserved for enable everything */
  19. #define SYSRQ_ENABLE_LOG 0x0002
  20. #define SYSRQ_ENABLE_KEYBOARD 0x0004
  21. #define SYSRQ_ENABLE_DUMP 0x0008
  22. #define SYSRQ_ENABLE_SYNC 0x0010
  23. #define SYSRQ_ENABLE_REMOUNT 0x0020
  24. #define SYSRQ_ENABLE_SIGNAL 0x0040
  25. #define SYSRQ_ENABLE_BOOT 0x0080
  26. #define SYSRQ_ENABLE_RTNICE 0x0100
  27. struct sysrq_key_op {
  28. void (*handler)(int, struct tty_struct *);
  29. char *help_msg;
  30. char *action_msg;
  31. int enable_mask;
  32. };
  33. #ifdef CONFIG_MAGIC_SYSRQ
  34. extern int sysrq_on(void);
  35. /*
  36. * Do not use this one directly:
  37. */
  38. extern int __sysrq_enabled;
  39. /* Generic SysRq interface -- you may call it from any device driver, supplying
  40. * ASCII code of the key, pointer to registers and kbd/tty structs (if they
  41. * are available -- else NULL's).
  42. */
  43. void handle_sysrq(int key, struct tty_struct *tty);
  44. void __handle_sysrq(int key, struct tty_struct *tty, int check_mask);
  45. int register_sysrq_key(int key, struct sysrq_key_op *op);
  46. int unregister_sysrq_key(int key, struct sysrq_key_op *op);
  47. struct sysrq_key_op *__sysrq_get_key_op(int key);
  48. #else
  49. static inline int sysrq_on(void)
  50. {
  51. return 0;
  52. }
  53. static inline int __reterr(void)
  54. {
  55. return -EINVAL;
  56. }
  57. static inline void handle_sysrq(int key, struct tty_struct *tty)
  58. {
  59. }
  60. #define register_sysrq_key(ig,nore) __reterr()
  61. #define unregister_sysrq_key(ig,nore) __reterr()
  62. #endif
  63. #endif /* _LINUX_SYSRQ_H */