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1da177e4 LT |
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 | ||
89bbc03c TP |
14 | #ifndef _LINUX_SYSRQ_H |
15 | #define _LINUX_SYSRQ_H | |
1da177e4 LT |
16 | |
17 | struct pt_regs; | |
18 | struct tty_struct; | |
19 | ||
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 | |
30 | ||
31 | struct sysrq_key_op { | |
7d12e780 | 32 | void (*handler)(int, struct tty_struct *); |
1da177e4 LT |
33 | char *help_msg; |
34 | char *action_msg; | |
35 | int enable_mask; | |
36 | }; | |
37 | ||
38 | #ifdef CONFIG_MAGIC_SYSRQ | |
39 | ||
5d6f647f IM |
40 | extern int sysrq_on(void); |
41 | ||
42 | /* | |
43 | * Do not use this one directly: | |
44 | */ | |
45 | extern int __sysrq_enabled; | |
46 | ||
1da177e4 LT |
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). | |
50 | */ | |
51 | ||
5d6f647f IM |
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); | |
1da177e4 LT |
56 | struct sysrq_key_op *__sysrq_get_key_op(int key); |
57 | ||
58 | #else | |
59 | ||
5d6f647f IM |
60 | static inline int sysrq_on(void) |
61 | { | |
62 | return 0; | |
63 | } | |
1da177e4 LT |
64 | static inline int __reterr(void) |
65 | { | |
66 | return -EINVAL; | |
67 | } | |
5d6f647f IM |
68 | static inline void handle_sysrq(int key, struct tty_struct *tty) |
69 | { | |
70 | } | |
1da177e4 LT |
71 | |
72 | #define register_sysrq_key(ig,nore) __reterr() | |
73 | #define unregister_sysrq_key(ig,nore) __reterr() | |
74 | ||
75 | #endif | |
89bbc03c TP |
76 | |
77 | #endif /* _LINUX_SYSRQ_H */ |