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
  15 struct pt_regs;
  16 struct tty_struct;
  17
  18 /* Possible values of bitmask for enabling sysrq functions */
  19 /* 0x0001 is reserved for enable everything */
  20 #define SYSRQ_ENABLE_LOG        0x0002
  21 #define SYSRQ_ENABLE_KEYBOARD   0x0004
  22 #define SYSRQ_ENABLE_DUMP       0x0008
  23 #define SYSRQ_ENABLE_SYNC       0x0010
  24 #define SYSRQ_ENABLE_REMOUNT    0x0020
  25 #define SYSRQ_ENABLE_SIGNAL     0x0040
  26 #define SYSRQ_ENABLE_BOOT       0x0080
  27 #define SYSRQ_ENABLE_RTNICE     0x0100
  28
  29 struct sysrq_key_op {
  30         void (*handler)(int, struct pt_regs *, struct tty_struct *);
  31         char *help_msg;
  32         char *action_msg;
  33         int enable_mask;
  34 };
  35
  36 #ifdef CONFIG_MAGIC_SYSRQ
  37
  38 /* Generic SysRq interface -- you may call it from any device driver, supplying
  39  * ASCII code of the key, pointer to registers and kbd/tty structs (if they
  40  * are available -- else NULL's).
  41  */
  42
  43 void handle_sysrq(int, struct pt_regs *, struct tty_struct *);
  44 void __handle_sysrq(int, struct pt_regs *, struct tty_struct *, int check_mask);
  45 int register_sysrq_key(int, struct sysrq_key_op *);
  46 int unregister_sysrq_key(int, struct sysrq_key_op *);
  47 struct sysrq_key_op *__sysrq_get_key_op(int key);
  48
  49 #else
  50
  51 static inline int __reterr(void)
  52 {
  53         return -EINVAL;
  54 }
  55
  56 #define register_sysrq_key(ig,nore) __reterr()
  57 #define unregister_sysrq_key(ig,nore) __reterr()
  58
  59 #endif