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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 | ||
14 | #include <linux/config.h> | |
15 | ||
16 | struct pt_regs; | |
17 | struct tty_struct; | |
18 | ||
19 | /* Possible values of bitmask for enabling sysrq functions */ | |
20 | /* 0x0001 is reserved for enable everything */ | |
21 | #define SYSRQ_ENABLE_LOG 0x0002 | |
22 | #define SYSRQ_ENABLE_KEYBOARD 0x0004 | |
23 | #define SYSRQ_ENABLE_DUMP 0x0008 | |
24 | #define SYSRQ_ENABLE_SYNC 0x0010 | |
25 | #define SYSRQ_ENABLE_REMOUNT 0x0020 | |
26 | #define SYSRQ_ENABLE_SIGNAL 0x0040 | |
27 | #define SYSRQ_ENABLE_BOOT 0x0080 | |
28 | #define SYSRQ_ENABLE_RTNICE 0x0100 | |
29 | ||
30 | struct sysrq_key_op { | |
31 | void (*handler)(int, struct pt_regs *, struct tty_struct *); | |
32 | char *help_msg; | |
33 | char *action_msg; | |
34 | int enable_mask; | |
35 | }; | |
36 | ||
37 | #ifdef CONFIG_MAGIC_SYSRQ | |
38 | ||
39 | /* Generic SysRq interface -- you may call it from any device driver, supplying | |
40 | * ASCII code of the key, pointer to registers and kbd/tty structs (if they | |
41 | * are available -- else NULL's). | |
42 | */ | |
43 | ||
44 | void handle_sysrq(int, struct pt_regs *, struct tty_struct *); | |
45 | void __handle_sysrq(int, struct pt_regs *, struct tty_struct *, int check_mask); | |
46 | int register_sysrq_key(int, struct sysrq_key_op *); | |
47 | int unregister_sysrq_key(int, struct sysrq_key_op *); | |
48 | struct sysrq_key_op *__sysrq_get_key_op(int key); | |
49 | ||
50 | #else | |
51 | ||
52 | static inline int __reterr(void) | |
53 | { | |
54 | return -EINVAL; | |
55 | } | |
56 | ||
57 | #define register_sysrq_key(ig,nore) __reterr() | |
58 | #define unregister_sysrq_key(ig,nore) __reterr() | |
59 | ||
60 | #endif |