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 #include <linux/config.h>
15
16 struct pt_regs;
17 struct tty_struct;
18
19 struct sysrq_key_op {
20 void (*handler)(int, struct pt_regs *, struct tty_struct *);
21 char *help_msg;
22 char *action_msg;
23 };
24
25 #ifdef CONFIG_MAGIC_SYSRQ
26
27 /* Generic SysRq interface -- you may call it from any device driver, supplying
28 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
29 * are available -- else NULL's).
30 */
31
32 void handle_sysrq(int, struct pt_regs *, struct tty_struct *);
33 void __handle_sysrq(int, struct pt_regs *, struct tty_struct *);
34 int register_sysrq_key(int, struct sysrq_key_op *);
35 int unregister_sysrq_key(int, struct sysrq_key_op *);
36 struct sysrq_key_op *__sysrq_get_key_op(int key);
37
38 #else
39
40 static inline int __reterr(void)
41 {
42 return -EINVAL;
43 }
44
45 #define register_sysrq_key(ig,nore) __reterr()
46 #define unregister_sysrq_key(ig,nore) __reterr()
47
48 #endif
49
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