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 struct pt_regs; 18 struct tty_struct; 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, struct tty_struct *); 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, struct tty_struct *); 46 void __handle_sysrq(int, struct tty_struct *, int check_mask); 47 int register_sysrq_key(int, struct sysrq_key_op *); 48 int unregister_sysrq_key(int, struct sysrq_key_op *); 49 struct sysrq_key_op *__sysrq_get_key_op(int key); 50 51 #else 52 53 static inline int __reterr(void) 54 { 55 return -EINVAL; 56 } 57 58 #define register_sysrq_key(ig,nore) __reterr() 59 #define unregister_sysrq_key(ig,nore) __reterr() 60 61 #endif 62 63 #endif /* _LINUX_SYSRQ_H */ 64