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/* -*- linux-c -*-
* $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
* Linux Magic System Request Key Hacks
* (c) 1997 Martin Mares <>
* (c) 2000 Crutcher Dunnavant <>
* overhauled to use key registration
* based upon discusions in irc://
#ifndef _LINUX_SYSRQ_H
#define _LINUX_SYSRQ_H
#include <linux/errno.h>
struct pt_regs;
struct tty_struct;
/* Possible values of bitmask for enabling sysrq functions */
/* 0x0001 is reserved for enable everything */
#define SYSRQ_ENABLE_LOG 0x0002
#define SYSRQ_ENABLE_DUMP 0x0008
#define SYSRQ_ENABLE_SYNC 0x0010
#define SYSRQ_ENABLE_SIGNAL 0x0040
#define SYSRQ_ENABLE_BOOT 0x0080
#define SYSRQ_ENABLE_RTNICE 0x0100
struct sysrq_key_op {
void (*handler)(int, struct tty_struct *);
char *help_msg;
char *action_msg;
int enable_mask;
extern int sysrq_on(void);
* Do not use this one directly:
extern int __sysrq_enabled;
/* Generic SysRq interface -- you may call it from any device driver, supplying
* ASCII code of the key, pointer to registers and kbd/tty structs (if they
* are available -- else NULL's).
void handle_sysrq(int key, struct tty_struct *tty);
void __handle_sysrq(int key, struct tty_struct *tty, int check_mask);
int register_sysrq_key(int key, struct sysrq_key_op *op);
int unregister_sysrq_key(int key, struct sysrq_key_op *op);
struct sysrq_key_op *__sysrq_get_key_op(int key);
static inline int sysrq_on(void)
return 0;
static inline int __reterr(void)
return -EINVAL;
static inline void handle_sysrq(int key, struct tty_struct *tty)
#define register_sysrq_key(ig,nore) __reterr()
#define unregister_sysrq_key(ig,nore) __reterr()
#endif /* _LINUX_SYSRQ_H */