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- /* -*- linux-c -*-
- *
- * $Id: sysrq.h,v 1.1.1.1 2007/06/12 07:27:16 eyryu Exp $
- *
- * Linux Magic System Request Key Hacks
- *
- * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
- *
- * (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
- * overhauled to use key registration
- * based upon discusions in irc://irc.openprojects.net/#kernelnewbies
- */
- #ifndef _LINUX_SYSRQ_H
- #define _LINUX_SYSRQ_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_KEYBOARD 0x0004
- #define SYSRQ_ENABLE_DUMP 0x0008
- #define SYSRQ_ENABLE_SYNC 0x0010
- #define SYSRQ_ENABLE_REMOUNT 0x0020
- #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;
- };
- #ifdef CONFIG_MAGIC_SYSRQ
- 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);
- #else
- 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
- #endif /* _LINUX_SYSRQ_H */
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