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 /* Enable/disable SYSRQ support by default (0==no, 1==yes). */ 21 #define SYSRQ_DEFAULT_ENABLE 1 22 23 /* Possible values of bitmask for enabling sysrq functions */ 24 /* 0x0001 is reserved for enable everything */ 25 #define SYSRQ_ENABLE_LOG 0x0002 26 #define SYSRQ_ENABLE_KEYBOARD 0x0004 27 #define SYSRQ_ENABLE_DUMP 0x0008 28 #define SYSRQ_ENABLE_SYNC 0x0010 29 #define SYSRQ_ENABLE_REMOUNT 0x0020 30 #define SYSRQ_ENABLE_SIGNAL 0x0040 31 #define SYSRQ_ENABLE_BOOT 0x0080 32 #define SYSRQ_ENABLE_RTNICE 0x0100 33 34 struct sysrq_key_op { 35 void (*handler)(int); 36 char *help_msg; 37 char *action_msg; 38 int enable_mask; 39 }; 40 41 #ifdef CONFIG_MAGIC_SYSRQ 42 43 /* Generic SysRq interface -- you may call it from any device driver, supplying 44 * ASCII code of the key, pointer to registers and kbd/tty structs (if they 45 * are available -- else NULL's). 46 */ 47 48 void handle_sysrq(int key); 49 void __handle_sysrq(int key, bool check_mask); 50 int register_sysrq_key(int key, struct sysrq_key_op *op); 51 int unregister_sysrq_key(int key, struct sysrq_key_op *op); 52 struct sysrq_key_op *__sysrq_get_key_op(int key); 53 54 int sysrq_toggle_support(int enable_mask); 55 56 #else 57 58 static inline void handle_sysrq(int key) 59 { 60 } 61 62 static inline void __handle_sysrq(int key, bool check_mask) 63 { 64 } 65 66 static inline int register_sysrq_key(int key, struct sysrq_key_op *op) 67 { 68 return -EINVAL; 69 } 70 71 static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op) 72 { 73 return -EINVAL; 74 } 75 76 #endif 77 78 #endif /* _LINUX_SYSRQ_H */ 79