3 * $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
5 * Linux Magic System Request Key Hacks
7 * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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
14 #ifndef _LINUX_SYSRQ_H
15 #define _LINUX_SYSRQ_H
20 /* Possible values of bitmask for enabling sysrq functions */
21 /* 0x0001 is reserved for enable everything */
22 #define SYSRQ_ENABLE_LOG 0x0002
23 #define SYSRQ_ENABLE_KEYBOARD 0x0004
24 #define SYSRQ_ENABLE_DUMP 0x0008
25 #define SYSRQ_ENABLE_SYNC 0x0010
26 #define SYSRQ_ENABLE_REMOUNT 0x0020
27 #define SYSRQ_ENABLE_SIGNAL 0x0040
28 #define SYSRQ_ENABLE_BOOT 0x0080
29 #define SYSRQ_ENABLE_RTNICE 0x0100
32 void (*handler)(int, struct tty_struct *);
38 #ifdef CONFIG_MAGIC_SYSRQ
40 extern int sysrq_on(void);
43 * Do not use this one directly:
45 extern int __sysrq_enabled;
47 /* Generic SysRq interface -- you may call it from any device driver, supplying
48 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
49 * are available -- else NULL's).
52 void handle_sysrq(int key, struct tty_struct *tty);
53 void __handle_sysrq(int key, struct tty_struct *tty, int check_mask);
54 int register_sysrq_key(int key, struct sysrq_key_op *op);
55 int unregister_sysrq_key(int key, struct sysrq_key_op *op);
56 struct sysrq_key_op *__sysrq_get_key_op(int key);
60 static inline int sysrq_on(void)
64 static inline int __reterr(void)
68 static inline void handle_sysrq(int key, struct tty_struct *tty)
72 #define register_sysrq_key(ig,nore) __reterr()
73 #define unregister_sysrq_key(ig,nore) __reterr()
77 #endif /* _LINUX_SYSRQ_H */