source: GPL/trunk/include/asm/siginfo.h

#ifndef _I386_SIGINFO_H
#define _I386_SIGINFO_H

#include <linux/types.h>

/* XXX: This structure was copied from the Alpha; is there an iBCS version?  */

typedef union sigval {
        int sival_int;
        void *sival_ptr;
} sigval_t;

#define SI_MAX_SIZE     128
#define SI_PAD_SIZE     ((SI_MAX_SIZE/sizeof(int)) - 3)

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 */
                        uid_t _uid;             /* sender's uid */
                } _kill;

                /* POSIX.1b timers */
                struct {
                        unsigned int _timer1;
                        unsigned int _timer2;
                } _timer;

                /* POSIX.1b signals */
                struct {
                        pid_t _pid;             /* sender's pid */
                        uid_t _uid;             /* sender's uid */
                        sigval_t _sigval;
                } _rt;

                /* SIGCHLD */
                struct {
                        pid_t _pid;             /* which child */
                        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. */
                } _sigfault;

                /* SIGPOLL */
                struct {
                        int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
                        int _fd;
                } _sigpoll;
        } _sifields;
} siginfo_t;

/*
 * How these fields are to be accessed.
 */
#define si_pid          _sifields._kill._pid
#define si_uid          _sifields._kill._uid
#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
#define si_band         _sifields._sigpoll._band
#define si_fd           _sifields._sigpoll._fd

/*
 * 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        -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_FROMUSER(siptr)      ((siptr)->si_code <= 0)
#define SI_FROMKERNEL(siptr)    ((siptr)->si_code > 0)

/*
 * SIGILL si_codes
 */
#define ILL_ILLOPC      1       /* illegal opcode */
#define ILL_ILLOPN      2       /* illegal operand */
#define ILL_ILLADR      3       /* illegal addressing mode */
#define ILL_ILLTRP      4       /* illegal trap */
#define ILL_PRVOPC      5       /* privileged opcode */
#define ILL_PRVREG      6       /* privileged register */
#define ILL_COPROC      7       /* coprocessor error */
#define ILL_BADSTK      8       /* internal stack error */
#define NSIGILL         8

/*
 * SIGFPE si_codes
 */
#define FPE_INTDIV      1       /* integer divide by zero */
#define FPE_INTOVF      2       /* integer overflow */
#define FPE_FLTDIV      3       /* floating point divide by zero */
#define FPE_FLTOVF      4       /* floating point overflow */
#define FPE_FLTUND      5       /* floating point underflow */
#define FPE_FLTRES      6       /* floating point inexact result */
#define FPE_FLTINV      7       /* floating point invalid operation */
#define FPE_FLTSUB      8       /* subscript out of range */
#define NSIGFPE         8

/*
 * SIGSEGV si_codes
 */
#define SEGV_MAPERR     1       /* address not mapped to object */
#define SEGV_ACCERR     2       /* invalid permissions for mapped object */
#define NSIGSEGV        2

/*
 * SIGBUS si_codes
 */
#define BUS_ADRALN      1       /* invalid address alignment */
#define BUS_ADRERR      2       /* non-existant physical address */
#define BUS_OBJERR      3       /* object specific hardware error */
#define NSIGBUS         3

/*
 * SIGTRAP si_codes
 */
#define TRAP_BRKPT      1       /* process breakpoint */
#define TRAP_TRACE      2       /* process trace trap */
#define NSIGTRAP        2

/*
 * SIGCHLD si_codes
 */
#define CLD_EXITED      1       /* child has exited */
#define CLD_KILLED      2       /* child was killed */
#define CLD_DUMPED      3       /* child terminated abnormally */
#define CLD_TRAPPED     4       /* traced child has trapped */
#define CLD_STOPPED     5       /* child has stopped */
#define CLD_CONTINUED   6       /* stopped child has continued */
#define NSIGCHLD

/*
 * SIGPOLL si_codes
 */
#define POLL_IN         1       /* data input available */
#define POLL_OUT        2       /* output buffers available */
#define POLL_MSG        3       /* input message available */
#define POLL_ERR        4       /* i/o error */
#define POLL_PRI        5       /* high priority input available */
#define POLL_HUP        6       /* device disconnected */
#define NSIGPOLL        6

/*
 * 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_MAX_SIZE  64
#define SIGEV_PAD_SIZE  ((SIGEV_MAX_SIZE/sizeof(int)) - 3)

typedef struct sigevent {
        sigval_t sigev_value;
        int sigev_signo;
        int sigev_notify;
        union {
                int _pad[SIGEV_PAD_SIZE];

                struct {
                        void (*_function)(sigval_t);
                        void *_attribute;       /* really pthread_attr_t */
                } _sigev_thread;
        } _sigev_un;
} sigevent_t;

#define sigev_notify_function   _sigev_un._sigev_thread._function
#define sigev_notify_attributes _sigev_un._sigev_thread._attribute

#endif