✏ EDIT: siginfo_t.h

#ifndef __siginfo_t_defined
#define __siginfo_t_defined 1

#include <bits/wordsize.h>
#include <bits/types.h>
#include <bits/types/__sigval_t.h>

#define __SI_MAX_SIZE	128
#if __WORDSIZE == 64
# define __SI_PAD_SIZE	((__SI_MAX_SIZE / sizeof (int)) - 4)
#else
# define __SI_PAD_SIZE	((__SI_MAX_SIZE / sizeof (int)) - 3)
#endif

/* Some fields of siginfo_t have architecture-specific variations.  */
#include <bits/siginfo-arch.h>
#ifndef __SI_ALIGNMENT
# define __SI_ALIGNMENT		/* nothing */
#endif
#ifndef __SI_BAND_TYPE
# define __SI_BAND_TYPE		long int
#endif
#ifndef __SI_CLOCK_T
# define __SI_CLOCK_T		__clock_t
#endif
#ifndef __SI_ERRNO_THEN_CODE
# define __SI_ERRNO_THEN_CODE	1
#endif
#ifndef __SI_HAVE_SIGSYS
# define __SI_HAVE_SIGSYS	1
#endif
#ifndef __SI_SIGFAULT_ADDL
# define __SI_SIGFAULT_ADDL	/* nothing */
#endif

typedef struct
  {
    int si_signo;		/* Signal number.  */
#if __SI_ERRNO_THEN_CODE
    int si_errno;		/* If non-zero, an errno value associated with
				   this signal, as defined in <errno.h>.  */
    int si_code;		/* Signal code.  */
#else
    int si_code;
    int si_errno;
#endif
#if __WORDSIZE == 64
    int __pad0;			/* Explicit padding.  */
#endif

union
      {
	int _pad[__SI_PAD_SIZE];

/* kill().  */
	struct
	  {
	    __pid_t si_pid;	/* Sending process ID.  */
	    __uid_t si_uid;	/* Real user ID of sending process.  */
	  } _kill;

/* POSIX.1b timers.  */
	struct
	  {
	    int si_tid;		/* Timer ID.  */
	    int si_overrun;	/* Overrun count.  */
	    __sigval_t si_sigval;	/* Signal value.  */
	  } _timer;

/* POSIX.1b signals.  */
	struct
	  {
	    __pid_t si_pid;	/* Sending process ID.  */
	    __uid_t si_uid;	/* Real user ID of sending process.  */
	    __sigval_t si_sigval;	/* Signal value.  */
	  } _rt;

/* SIGCHLD.  */
	struct
	  {
	    __pid_t si_pid;	/* Which child.	 */
	    __uid_t si_uid;	/* Real user ID of sending process.  */
	    int si_status;	/* Exit value or signal.  */
	    __SI_CLOCK_T si_utime;
	    __SI_CLOCK_T si_stime;
	  } _sigchld;

/* SIGILL, SIGFPE, SIGSEGV, SIGBUS.  */
	struct
	  {
	    void *si_addr;	    /* Faulting insn/memory ref.  */
	    __SI_SIGFAULT_ADDL
	    short int si_addr_lsb;  /* Valid LSB of the reported address.  */
	    union
	      {
		/* used when si_code=SEGV_BNDERR */
		struct
		  {
		    void *_lower;
		    void *_upper;
		  } _addr_bnd;
		/* used when si_code=SEGV_PKUERR */
		__uint32_t _pkey;
	      } _bounds;
	  } _sigfault;

/* SIGPOLL.  */
	struct
	  {
	    long int si_band;	/* Band event for SIGPOLL.  */
	    int si_fd;
	  } _sigpoll;

/* SIGSYS.  */
#if __SI_HAVE_SIGSYS
	struct
	  {
	    void *_call_addr;	/* Calling user insn.  */
	    int _syscall;	/* Triggering system call number.  */
	    unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
	  } _sigsys;
#endif
      } _sifields;
  } siginfo_t __SI_ALIGNMENT;

/* X/Open requires some more fields with fixed names.  */
#define si_pid		_sifields._kill.si_pid
#define si_uid		_sifields._kill.si_uid
#define si_timerid	_sifields._timer.si_tid
#define si_overrun	_sifields._timer.si_overrun
#define si_status	_sifields._sigchld.si_status
#define si_utime	_sifields._sigchld.si_utime
#define si_stime	_sifields._sigchld.si_stime
#define si_value	_sifields._rt.si_sigval
#define si_int		_sifields._rt.si_sigval.sival_int
#define si_ptr		_sifields._rt.si_sigval.sival_ptr
#define si_addr		_sifields._sigfault.si_addr
#define si_addr_lsb	_sifields._sigfault.si_addr_lsb
#define si_lower	_sifields._sigfault._bounds._addr_bnd._lower
#define si_upper	_sifields._sigfault._bounds._addr_bnd._upper
#define si_pkey		_sifields._sigfault._bounds._pkey
#define si_band		_sifields._sigpoll.si_band
#define si_fd		_sifields._sigpoll.si_fd
#if __SI_HAVE_SIGSYS
# define si_call_addr	_sifields._sigsys._call_addr
# define si_syscall	_sifields._sigsys._syscall
# define si_arch	_sifields._sigsys._arch
#endif

#endif

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