Add POSIX siginfo_t's si_code, this is for upcoming POSIX realtime signal

support in kernel.

Earlier patch reviewed by: jhb, deischen

sys/i386/include/trap.h

@@ -72,16 +72,6 @@
 #define	    ILL_ALIGN_FAULT	T_ALIGNFLT
 #define	    ILL_FPOP_FAULT	T_FPOPFLT	/* coprocessor operand fault */
 
-/* portable macros for SIGFPE/ARITHTRAP */
-#define FPE_INTOVF	1	/* integer overflow */
-#define FPE_INTDIV	2	/* integer divide by zero */
-#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	/* invalid floating point operation */
-#define FPE_FLTSUB	8	/* subscript out of range */
-
 /* old FreeBSD macros, deprecated */
 #define	FPE_INTOVF_TRAP	0x1	/* integer overflow */
 #define	FPE_INTDIV_TRAP	0x2	/* integer divide by zero */

sys/sys/signal.h

@@ -111,9 +111,9 @@
 #if __BSD_VISIBLE
 #define	SIGTHR		32	/* Thread interrupt. */
 #endif
-/*
- * XXX missing SIGRTMIN, SIGRTMAX.
- */
+
+#define	SIGRTMIN	65
+#define	SIGRTMAX	128
 
 #define	SIG_DFL		((__sighandler_t *)0)
 #define	SIG_IGN		((__sighandler_t *)1)
@@ -199,8 +199,69 @@ typedef	struct __siginfo {
 	void	*si_addr;		/* faulting instruction */
 	union sigval si_value;		/* signal value */
 	long	si_band;		/* band event for SIGPOLL */
-	int	__spare__[7];		/* gimme some slack */
+	union	{
+		struct {
+			int	_trapno;/* machine specific trap code */
+		} _fault;
+		int	__spare__[7];	/* gimme some slack */
+	} _reason;
 } siginfo_t;
+
+#define si_trapno	_reason._fault._trapno
+
+/** si_code **/
+/* codes for SIGILL */
+#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.		*/
+
+/* codes for SIGBUS */
+#define BUS_ADRALN	1	/* Invalid address alignment.		*/
+#define BUS_ADRERR	2	/* Nonexistent physical address.	*/
+#define BUS_OBJERR	3	/* Object-specific hardware error.	*/
+
+/* codes for SIGSEGV */
+#define SEGV_MAPERR	1	/* Address not mapped to object.	*/
+#define SEGV_ACCERR	2	/* Invalid permissions for mapped	*/
+				/* object.				*/
+
+/* codes for SIGFPE */
+#define FPE_INTOVF	1	/* Integer overflow.			*/
+#define FPE_INTDIV	2	/* Integer divide by zero.		*/
+#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	/* Invalid floating point operation.	*/
+#define FPE_FLTSUB	8	/* Subscript out of range.		*/
+
+/* codes for SIGTRAP */
+#define TRAP_BRKPT	1	/* Process breakpoint.			*/
+#define TRAP_TRACE	2	/* Process trace trap.			*/
+
+/* codes for SIGCHLD */
+#define CLD_EXITED	1	/* Child has exited			*/
+#define CLD_KILLED	2	/* Child has terminated abnormally but	*/
+				/* did not create a core file		*/
+#define CLD_DUMPED	3	/* Child has terminated abnormally and	*/
+				/* created a core file			*/
+#define CLD_TRAPPED	4	/* Traced child has trapped		*/
+#define CLD_STOPPED	5	/* Child has stopped			*/
+#define CLD_CONTINUED	6	/* Stopped child has continued		*/
+
+/* codes for SIGPOLL */
+#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	4	/* Device disconnected			*/
+
 #endif
 
 #if __POSIX_VISIBLE || __XSI_VISIBLE
@@ -244,11 +305,14 @@ struct sigaction {
 #endif
 
 #if __POSIX_VISIBLE || __XSI_VISIBLE
-#define	SI_USER		0x10001
-#define	SI_QUEUE	0x10002
-#define	SI_TIMER	0x10003
-#define	SI_ASYNCIO	0x10004
-#define	SI_MESGQ	0x10005
+#define	SI_USER		0x10001		/* Signal sent by kill(). */
+#define	SI_QUEUE	0x10002		/* Signal sent by the sigqueue(). */
+#define	SI_TIMER	0x10003		/* Signal generated by expiration of */
+					/* a timer set by timer_settime(). */
+#define	SI_ASYNCIO	0x10004		/* Signal generated by completion of */
+					/* an asynchronous I/O request.*/
+#define	SI_MESGQ	0x10005		/* Signal generated by arrival of a */
+					/* message on an empty message queue. */
 #endif
 #if __BSD_VISIBLE
 #define	SI_UNDEFINED	0