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 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