linux/include/linux/sysrq.h
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   1/* -*- linux-c -*-
   2 *
   3 *      $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj 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
  14#ifndef _LINUX_SYSRQ_H
  15#define _LINUX_SYSRQ_H
  16
  17#include <linux/errno.h>
  18#include <linux/types.h>
  19
  20/* Enable/disable SYSRQ support by default (0==no, 1==yes). */
  21#define SYSRQ_DEFAULT_ENABLE    1
  22
  23/* Possible values of bitmask for enabling sysrq functions */
  24/* 0x0001 is reserved for enable everything */
  25#define SYSRQ_ENABLE_LOG        0x0002
  26#define SYSRQ_ENABLE_KEYBOARD   0x0004
  27#define SYSRQ_ENABLE_DUMP       0x0008
  28#define SYSRQ_ENABLE_SYNC       0x0010
  29#define SYSRQ_ENABLE_REMOUNT    0x0020
  30#define SYSRQ_ENABLE_SIGNAL     0x0040
  31#define SYSRQ_ENABLE_BOOT       0x0080
  32#define SYSRQ_ENABLE_RTNICE     0x0100
  33
  34struct sysrq_key_op {
  35        void (*handler)(int);
  36        char *help_msg;
  37        char *action_msg;
  38        int enable_mask;
  39};
  40
  41#ifdef CONFIG_MAGIC_SYSRQ
  42
  43/* Generic SysRq interface -- you may call it from any device driver, supplying
  44 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
  45 * are available -- else NULL's).
  46 */
  47
  48void handle_sysrq(int key);
  49void __handle_sysrq(int key, bool check_mask);
  50int register_sysrq_key(int key, struct sysrq_key_op *op);
  51int unregister_sysrq_key(int key, struct sysrq_key_op *op);
  52struct sysrq_key_op *__sysrq_get_key_op(int key);
  53
  54int sysrq_toggle_support(int enable_mask);
  55
  56#else
  57
  58static inline void handle_sysrq(int key)
  59{
  60}
  61
  62static inline void __handle_sysrq(int key, bool check_mask)
  63{
  64}
  65
  66static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
  67{
  68        return -EINVAL;
  69}
  70
  71static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
  72{
  73        return -EINVAL;
  74}
  75
  76#endif
  77
  78#endif /* _LINUX_SYSRQ_H */
  79
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