Add ptrace functions of job-control and signal

Note that a forked process automatically becomes ptraced state in this
commit.

arch/x86/kernel/include/signal.h

@@ -36,6 +36,12 @@ struct sigaction {
 	sigset_t sa_mask;
 };
 
+typedef void __sig_fn_t(int);
+typedef __sig_fn_t *__sig_handler_t;
+#define SIG_DFL (__sig_handler_t)0
+#define SIG_IGN (__sig_handler_t)1
+#define SIG_ERR (__sig_handler_t)-1
+
 #define SA_NOCLDSTOP    0x00000001U
 #define SA_NOCLDWAIT    0x00000002U
 #define SA_NODEFER      0x40000000U
@@ -71,16 +77,69 @@ typedef struct siginfo {
 	int si_errno;		/* If non-zero, an errno value associated with
 				   this signal, as defined in <errno.h>.  */
 	int si_code;		/* Signal code.  */
-#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_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 __SI_CODE(__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_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 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 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 SEGV_MAPERR     1  /* address not mapped to object */
+#define SEGV_ACCERR     2  /* invalid permissions for mapped object */
+
+#define BUS_ADRALN      1  /* invalid address alignment */
+#define BUS_ADRERR      2  /* non-existant physical address */
+#define BUS_OBJERR      3  /* object specific hardware error */
+/* hardware memory error consumed on a machine check: action required */
+#define BUS_MCEERR_AR   4
+/* hardware memory error detected in process but not consumed: action optional*/
+#define BUS_MCEERR_AO   5
+
+#define TRAP_BRKPT      1  /* process breakpoint */
+#define TRAP_TRACE      2  /* process trace trap */
+#define TRAP_BRANCH     3  /* process taken branch trap */
+#define TRAP_HWBKPT     4  /* hardware breakpoint/watchpoint */
+
+#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 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 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 */
 
 	union {
 		int _pad[__SI_PAD_SIZE];
@@ -186,4 +245,6 @@ struct signalfd_siginfo {
 #define SIGUNUSED       31
 #define SIGRTMIN        32
 
+#define PTRACE_EVENT_EXEC 4
+
 #endif /*__HEADER_X86_COMMON_SIGNAL_H*/