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 <[email protected]> 8 * 9 * (c) 2000 Crutcher Dunnavant <[email protected]> 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 #include <linux/types.h> 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 { 32 void (*handler)(int); 33 char *help_msg; 34 char *action_msg; 35 int enable_mask; 36 }; 37 38 #ifdef CONFIG_MAGIC_SYSRQ 39 40 /* Generic SysRq interface -- you may call it from any device driver, supplying 41 * ASCII code of the key, pointer to registers and kbd/tty structs (if they 42 * are available -- else NULL's). 43 */ 44 45 void handle_sysrq(int key); 46 void __handle_sysrq(int key, bool check_mask); 47 int register_sysrq_key(int key, struct sysrq_key_op *op); 48 int unregister_sysrq_key(int key, struct sysrq_key_op *op); 49 struct sysrq_key_op *__sysrq_get_key_op(int key); 50 51 int sysrq_toggle_support(int enable_mask); 52 53 #else 54 55 static inline void handle_sysrq(int key) 56 { 57 } 58 59 static inline void __handle_sysrq(int key, bool check_mask) 60 { 61 } 62 63 static inline int register_sysrq_key(int key, struct sysrq_key_op *op) 64 { 65 return -EINVAL; 66 } 67 68 static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op) 69 { 70 return -EINVAL; 71 } 72 73 #endif 74 75 #endif /* _LINUX_SYSRQ_H */ 76