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
19 struct pt_regs;
20 struct tty_struct;
21
22 /* Possible values of bitmask for enabling sysrq functions */
23 /* 0x0001 is reserved for enable everything */
24 #define SYSRQ_ENABLE_LOG 0x0002
25 #define SYSRQ_ENABLE_KEYBOARD 0x0004
26 #define SYSRQ_ENABLE_DUMP 0x0008
27 #define SYSRQ_ENABLE_SYNC 0x0010
28 #define SYSRQ_ENABLE_REMOUNT 0x0020
29 #define SYSRQ_ENABLE_SIGNAL 0x0040
30 #define SYSRQ_ENABLE_BOOT 0x0080
31 #define SYSRQ_ENABLE_RTNICE 0x0100
32
33 struct sysrq_key_op {
34 void (*handler)(int, struct tty_struct *);
35 char *help_msg;
36 char *action_msg;
37 int enable_mask;
38 };
39
40 #ifdef CONFIG_MAGIC_SYSRQ
41
42 extern int sysrq_on(void);
43
44 /*
45 * Do not use this one directly:
46 */
47 extern int __sysrq_enabled;
48
49 /* Generic SysRq interface -- you may call it from any device driver, supplying
50 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
51 * are available -- else NULL's).
52 */
53
54 void handle_sysrq(int key, struct tty_struct *tty);
55 void __handle_sysrq(int key, struct tty_struct *tty, int check_mask);
56 int register_sysrq_key(int key, struct sysrq_key_op *op);
57 int unregister_sysrq_key(int key, struct sysrq_key_op *op);
58 struct sysrq_key_op *__sysrq_get_key_op(int key);
59
60 #else
61
62 static inline int sysrq_on(void)
63 {
64 return 0;
65 }
66 static inline int __reterr(void)
67 {
68 return -EINVAL;
69 }
70 static inline void handle_sysrq(int key, struct tty_struct *tty)
71 {
72 }
73
74 #define register_sysrq_key(ig,nore) __reterr()
75 #define unregister_sysrq_key(ig,nore) __reterr()
76
77 #endif
78
79 #endif /* _LINUX_SYSRQ_H */
80
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