Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* -*- linux-c -*- |
| 2 | * |
||
| 3 | * $Id: sysrq.h,v 1.1 2004-01-28 15:26:47 giacomo 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 | |||
| 34 | /* |
||
| 35 | * Nonlocking version of handle sysrq, used by sysrq handlers that need to |
||
| 36 | * call sysrq handlers |
||
| 37 | */ |
||
| 38 | |||
| 39 | void __handle_sysrq_nolock(int, struct pt_regs *, struct tty_struct *); |
||
| 40 | |||
| 41 | /* |
||
| 42 | * Sysrq registration manipulation functions |
||
| 43 | */ |
||
| 44 | |||
| 45 | void __sysrq_lock_table (void); |
||
| 46 | void __sysrq_unlock_table (void); |
||
| 47 | struct sysrq_key_op *__sysrq_get_key_op (int key); |
||
| 48 | void __sysrq_put_key_op (int key, struct sysrq_key_op *op_p); |
||
| 49 | |||
| 50 | extern __inline__ int |
||
| 51 | __sysrq_swap_key_ops_nolock(int key, struct sysrq_key_op *insert_op_p, |
||
| 52 | struct sysrq_key_op *remove_op_p) |
||
| 53 | { |
||
| 54 | int retval; |
||
| 55 | if (__sysrq_get_key_op(key) == remove_op_p) { |
||
| 56 | __sysrq_put_key_op(key, insert_op_p); |
||
| 57 | retval = 0; |
||
| 58 | } else { |
||
| 59 | retval = -1; |
||
| 60 | } |
||
| 61 | return retval; |
||
| 62 | } |
||
| 63 | |||
| 64 | extern __inline__ int |
||
| 65 | __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p, |
||
| 66 | struct sysrq_key_op *remove_op_p) { |
||
| 67 | int retval; |
||
| 68 | __sysrq_lock_table(); |
||
| 69 | retval = __sysrq_swap_key_ops_nolock(key, insert_op_p, remove_op_p); |
||
| 70 | __sysrq_unlock_table(); |
||
| 71 | return retval; |
||
| 72 | } |
||
| 73 | |||
| 74 | static inline int register_sysrq_key(int key, struct sysrq_key_op *op_p) |
||
| 75 | { |
||
| 76 | return __sysrq_swap_key_ops(key, op_p, NULL); |
||
| 77 | } |
||
| 78 | |||
| 79 | static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op_p) |
||
| 80 | { |
||
| 81 | return __sysrq_swap_key_ops(key, NULL, op_p); |
||
| 82 | } |
||
| 83 | |||
| 84 | #else |
||
| 85 | |||
| 86 | static inline int __reterr(void) |
||
| 87 | { |
||
| 88 | return -EINVAL; |
||
| 89 | } |
||
| 90 | |||
| 91 | #define register_sysrq_key(ig,nore) __reterr() |
||
| 92 | #define unregister_sysrq_key(ig,nore) __reterr() |
||
| 93 | |||
| 94 | #endif |