text: #ifndef _ASM_GENERIC_SIGINFO_H
  #define _ASM_GENERIC_SIGINFO_H
  
  #include <linux/compiler.h>
  #include <linux/types.h>
  
  typedef union sigval {
  	int sival_int;
  	void *sival_ptr;
  } sigval_t;
  
  /*
   * This is the size (including padding) of the part of the
   * struct siginfo that is before the union.
   */
  #ifndef __ARCH_SI_PREAMBLE_SIZE
  #define __ARCH_SI_PREAMBLE_SIZE	(3 * sizeof(int))
  #endif
  
  #define SI_MAX_SIZE	128
  #ifndef SI_PAD_SIZE
  #define SI_PAD_SIZE	((SI_MAX_SIZE - __ARCH_SI_PREAMBLE_SIZE) / sizeof(int))
  #endif
  
  #ifndef __ARCH_SI_UID_T
  #define __ARCH_SI_UID_T	uid_t
  #endif
  
  #ifndef __ARCH_SI_BAND_T
  #define __ARCH_SI_BAND_T int
  #endif
  
  #ifndef HAVE_ARCH_SIGINFO_T
  
  typedef struct siginfo {
  	int si_signo;
  	int si_errno;
  	int si_code;
  
  	union {
  		int _pad[SI_PAD_SIZE];
  
  		/* kill() */
  		struct {
  			pid_t _pid;		/* sender's pid */
  			__ARCH_SI_UID_T _uid;	/* sender's uid */
  		} _kill;
  
  		/* POSIX.1b timers */
  		struct {
  			timer_t _tid;		/* timer id */
  			int _overrun;		/* overrun count */
  			char _pad[sizeof( __ARCH_SI_UID_T) - sizeof(int)];
  			sigval_t _sigval;	/* same as below */
  			int _sys_private;       /* not to be passed to user */
  		} _timer;
  
  		/* POSIX.1b signals */
  		struct {
  			pid_t _pid;		/* sender's pid */
  			__ARCH_SI_UID_T _uid;	/* sender's uid */
  			sigval_t _sigval;
  		} _rt;
  
  		/* SIGCHLD */
  		struct {
  			pid_t _pid;		/* which child */
  			__ARCH_SI_UID_T _uid;	/* sender's uid */
  			int _status;		/* exit code */
  			clock_t _utime;
  			clock_t _stime;
  		} _sigchld;
  
  		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
  		struct {
  			void *_addr; /* faulting insn/memory ref. */
  #ifdef __ARCH_SI_TRAPNO
  			int _trapno;	/* TRAP # which caused the signal */
  #endif
  		} _sigfault;
  
  		/* SIGPOLL */
  		struct {
  			__ARCH_SI_BAND_T _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
  			int _fd;
  		} _sigpoll;
  	} _sifields;
  } siginfo_t;
  
  #endif
  
  /*
   * How these fields are to be accessed.
   */
  #define si_pid		_sifields._kill._pid
  #define si_uid		_sifields._kill._uid
  #define si_tid		_sifields._timer._tid
  #define si_overrun	_sifields._timer._overrun
  #define si_sys_private  _sifields._timer._sys_private
  #define si_status	_sifields._sigchld._status
  #define si_utime	_sifields._sigchld._utime
  #define si_stime	_sifields._sigchld._stime
  #define si_value	_sifields._rt._sigval
  #define si_int		_sifields._rt._sigval.sival_int
  #define si_ptr		_sifields._rt._sigval.sival_ptr
  #define si_addr		_sifields._sigfault._addr
  #ifdef __ARCH_SI_TRAPNO
  #define si_trapno	_sifields._sigfault._trapno
  #endif
  #define si_band		_sifields._sigpoll._band
  #define si_fd		_sifields._sigpoll._fd
  
  #ifdef __KERNEL__
  #define __SI_MASK	0xffff0000u
  #define __SI_KILL	(0 << 16)
  #define __SI_TIMER	(1 << 16)
  #define __SI_POLL	(2 << 16)
  #define __SI_FAULT	(3 << 16)
  #define __SI_CHLD	(4 << 16)
  #define __SI_RT		(5 << 16)
  #define __SI_CODE(T,N)	((T) | ((N) & 0xffff))
  #else
  #define __SI_KILL	0
  #define __SI_TIMER	0
  #define __SI_POLL	0
  #define __SI_FAULT	0
  #define __SI_CHLD	0
  #define __SI_RT		0
  #define __SI_CODE(T,N)	(N)
  #endif
  
  /*
   * si_code values
   * Digital reserves positive values for kernel-generated signals.
   */
  #define SI_USER		0		/* sent by kill, sigsend, raise */
  #define SI_KERNEL	0x80		/* sent by the kernel from somewhere */
  #define SI_QUEUE	-1		/* sent by sigqueue */
  #define SI_TIMER __SI_CODE(__SI_TIMER,-2) /* sent by timer expiration */
  #define SI_MESGQ	-3		/* sent by real time mesq state change */
  #define SI_ASYNCIO	-4		/* sent by AIO completion */
  #define SI_SIGIO	-5		/* sent by queued SIGIO */
  #define SI_TKILL	-6		/* sent by tkill system call */
  #define SI_DETHREAD	-7		/* sent by execve() killing subsidiary threads */
  
  #define SI_FROMUSER(siptr)	((siptr)->si_code <= 0)
  #define SI_FROMKERNEL(siptr)	((siptr)->si_code > 0)
  
  #ifndef HAVE_ARCH_SI_CODES
  /*
   * SIGILL si_codes
   */
  #define ILL_ILLOPC	(__SI_FAULT|1)	/* illegal opcode */
  #define ILL_ILLOPN	(__SI_FAULT|2)	/* illegal operand */
  #define ILL_ILLADR	(__SI_FAULT|3)	/* illegal addressing mode */
  #define ILL_ILLTRP	(__SI_FAULT|4)	/* illegal trap */
  #define ILL_PRVOPC	(__SI_FAULT|5)	/* privileged opcode */
  #define ILL_PRVREG	(__SI_FAULT|6)	/* privileged register */
  #define ILL_COPROC	(__SI_FAULT|7)	/* coprocessor error */
  #define ILL_BADSTK	(__SI_FAULT|8)	/* internal stack error */
  #define NSIGILL		8
  
  /*
   * SIGFPE si_codes
   */
  #define FPE_INTDIV	(__SI_FAULT|1)	/* integer divide by zero */
  #define FPE_INTOVF	(__SI_FAULT|2)	/* integer overflow */
  #define FPE_FLTDIV	(__SI_FAULT|3)	/* floating point divide by zero */
  #define FPE_FLTOVF	(__SI_FAULT|4)	/* floating point overflow */
  #define FPE_FLTUND	(__SI_FAULT|5)	/* floating point underflow */
  #define FPE_FLTRES	(__SI_FAULT|6)	/* floating point inexact result */
  #define FPE_FLTINV	(__SI_FAULT|7)	/* floating point invalid operation */
  #define FPE_FLTSUB	(__SI_FAULT|8)	/* subscript out of range */
  #define NSIGFPE		8
  
  /*
   * SIGSEGV si_codes
   */
  #define SEGV_MAPERR	(__SI_FAULT|1)	/* address not mapped to object */
  #define SEGV_ACCERR	(__SI_FAULT|2)	/* invalid permissions for mapped object */
  #define NSIGSEGV	2
  
  /*
   * SIGBUS si_codes
   */
  #define BUS_ADRALN	(__SI_FAULT|1)	/* invalid address alignment */
  #define BUS_ADRERR	(__SI_FAULT|2)	/* non-existant physical address */
  #define BUS_OBJERR	(__SI_FAULT|3)	/* object specific hardware error */
  #define NSIGBUS		3
  
  /*
   * SIGTRAP si_codes
   */
  #define TRAP_BRKPT	(__SI_FAULT|1)	/* process breakpoint */
  #define TRAP_TRACE	(__SI_FAULT|2)	/* process trace trap */
  #define NSIGTRAP	2
  
  /*
   * SIGCHLD si_codes
   */
  #define CLD_EXITED	(__SI_CHLD|1)	/* child has exited */
  #define CLD_KILLED	(__SI_CHLD|2)	/* child was killed */
  #define CLD_DUMPED	(__SI_CHLD|3)	/* child terminated abnormally */
  #define CLD_TRAPPED	(__SI_CHLD|4)	/* traced child has trapped */
  #define CLD_STOPPED	(__SI_CHLD|5)	/* child has stopped */
  #define CLD_CONTINUED	(__SI_CHLD|6)	/* stopped child has continued */
  #define NSIGCHLD	6
  
  /*
   * SIGPOLL si_codes
   */
  #define POLL_IN		(__SI_POLL|1)	/* data input available */
  #define POLL_OUT	(__SI_POLL|2)	/* output buffers available */
  #define POLL_MSG	(__SI_POLL|3)	/* input message available */
  #define POLL_ERR	(__SI_POLL|4)	/* i/o error */
  #define POLL_PRI	(__SI_POLL|5)	/* high priority input available */
  #define POLL_HUP	(__SI_POLL|6)	/* device disconnected */
  #define NSIGPOLL	6
  
  #endif
  
  /*
   * sigevent definitions
   * 
   * It seems likely that SIGEV_THREAD will have to be handled from 
   * userspace, libpthread transmuting it to SIGEV_SIGNAL, which the
   * thread manager then catches and does the appropriate nonsense.
   * However, everything is written out here so as to not get lost.
   */
  #define SIGEV_SIGNAL	0	/* notify via signal */
  #define SIGEV_NONE	1	/* other notification: meaningless */
  #define SIGEV_THREAD	2	/* deliver via thread creation */
  #define SIGEV_THREAD_ID 4	/* deliver to thread */
  
  #define SIGEV_MAX_SIZE	64
  #ifndef SIGEV_PAD_SIZE
  #define SIGEV_PAD_SIZE	((SIGEV_MAX_SIZE/sizeof(int)) - 3)
  #endif
  
  #ifndef HAVE_ARCH_SIGEVENT_T
  
  typedef struct sigevent {
  	sigval_t sigev_value;
  	int sigev_signo;
  	int sigev_notify;
  	union {
  		int _pad[SIGEV_PAD_SIZE];
  		 int _tid;
  
  		struct {
  			void (*_function)(sigval_t);
  			void *_attribute;	/* really pthread_attr_t */
  		} _sigev_thread;
  	} _sigev_un;
  } sigevent_t;
  
  #endif
  
  #define sigev_notify_function	_sigev_un._sigev_thread._function
  #define sigev_notify_attributes	_sigev_un._sigev_thread._attribute
  #define sigev_notify_thread_id	 _sigev_un._tid
  
  #ifdef __KERNEL__
  
  struct siginfo;
  void do_schedule_next_timer(struct siginfo *info);
  
  #ifndef HAVE_ARCH_COPY_SIGINFO
  
  #include <linux/string.h>
  
  static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
  {
  	if (from->si_code < 0)
  		memcpy(to, from, sizeof(*to));
  	else
  		/* _sigchld is currently the largest know union member */
  		memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
  }
  
  #endif
  
  extern int copy_siginfo_to_user(struct siginfo __user *to, struct siginfo *from);
  
  #endif /* __KERNEL__ */
  
  #endif
  