include/linux/sysrq.h

   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 <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 /* Possible values of bitmask for enabling sysrq functions */
  20 /* 0x0001 is reserved for enable everything */
  21 #define SYSRQ_ENABLE_LOG        0x0002
  22 #define SYSRQ_ENABLE_KEYBOARD   0x0004
  23 #define SYSRQ_ENABLE_DUMP       0x0008
  24 #define SYSRQ_ENABLE_SYNC       0x0010
  25 #define SYSRQ_ENABLE_REMOUNT    0x0020
  26 #define SYSRQ_ENABLE_SIGNAL     0x0040
  27 #define SYSRQ_ENABLE_BOOT       0x0080
  28 #define SYSRQ_ENABLE_RTNICE     0x0100
  29
  30 struct sysrq_key_op {
  31         void (*handler)(int, struct pt_regs *, struct tty_struct *);
  32         char *help_msg;
  33         char *action_msg;
  34         int enable_mask;
  35 };
  36
  37 #ifdef CONFIG_MAGIC_SYSRQ
  38
  39 /* Generic SysRq interface -- you may call it from any device driver, supplying
  40  * ASCII code of the key, pointer to registers and kbd/tty structs (if they
  41  * are available -- else NULL's).
  42  */
  43
  44 void handle_sysrq(int, struct pt_regs *, struct tty_struct *);
  45 void __handle_sysrq(int, struct pt_regs *, struct tty_struct *, int check_mask);
  46 int register_sysrq_key(int, struct sysrq_key_op *);
  47 int unregister_sysrq_key(int, struct sysrq_key_op *);
  48 struct sysrq_key_op *__sysrq_get_key_op(int key);
  49
  50 #else
  51
  52 static inline int __reterr(void)
  53 {
  54         return -EINVAL;
  55 }
  56
  57 #define register_sysrq_key(ig,nore) __reterr()
  58 #define unregister_sysrq_key(ig,nore) __reterr()
  59
  60 #endif