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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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