text: #ifndef _ASMx86_64_SIGNAL_H
  #define _ASMx86_64_SIGNAL_H
  
  #include <linux/types.h>
  
  /* Avoid too many header ordering problems.  */
  struct siginfo;
  
  #ifdef __KERNEL__
  /* Most things should be clean enough to redefine this at will, if care
     is taken to make libc match.  */
  
  #define _NSIG		64
  #define _NSIG_BPW	64
  #define _NSIG_WORDS	(_NSIG / _NSIG_BPW)
  
  typedef unsigned long old_sigset_t;		/* at least 32 bits */
  
  typedef struct {
  	unsigned long sig[_NSIG_WORDS];
  } sigset_t;
  
  #else
  /* Here we must cater to libcs that poke about in kernel headers.  */
  
  #define NSIG		32
  typedef unsigned long sigset_t;
  
  #endif /* __KERNEL__ */
  
  #define SIGHUP		 1
  #define SIGINT		 2
  #define SIGQUIT		 3
  #define SIGILL		 4
  #define SIGTRAP		 5
  #define SIGABRT		 6
  #define SIGIOT		 6
  #define SIGBUS		 7
  #define SIGFPE		 8
  #define SIGKILL		 9
  #define SIGUSR1		10
  #define SIGSEGV		11
  #define SIGUSR2		12
  #define SIGPIPE		13
  #define SIGALRM		14
  #define SIGTERM		15
  #define SIGSTKFLT	16
  #define SIGCHLD		17
  #define SIGCONT		18
  #define SIGSTOP		19
  #define SIGTSTP		20
  #define SIGTTIN		21
  #define SIGTTOU		22
  #define SIGURG		23
  #define SIGXCPU		24
  #define SIGXFSZ		25
  #define SIGVTALRM	26
  #define SIGPROF		27
  #define SIGWINCH	28
  #define SIGIO		29
  #define SIGPOLL		SIGIO
  /*
  #define SIGLOST		29
  */
  #define SIGPWR		30
  #define SIGSYS		31
  #define	SIGUNUSED	31
  
  /* These should not be considered constants from userland.  */
  #define SIGRTMIN	32
  #define SIGRTMAX	(_NSIG-1)
  
  /*
   * SA_FLAGS values:
   *
   * SA_ONSTACK indicates that a registered stack_t will be used.
   * SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
   * SA_RESTART flag to get restarting signals (which were the default long ago)
   * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
   * SA_RESETHAND clears the handler when the signal is delivered.
   * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
   * SA_NODEFER prevents the current signal from being masked in the handler.
   *
   * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
   * Unix names RESETHAND and NODEFER respectively.
   */
  #define SA_NOCLDSTOP	0x00000001
  #define SA_NOCLDWAIT	0x00000002 /* not supported yet */
  #define SA_SIGINFO	0x00000004
  #define SA_ONSTACK	0x08000000
  #define SA_RESTART	0x10000000
  #define SA_NODEFER	0x40000000
  #define SA_RESETHAND	0x80000000
  
  #define SA_NOMASK	SA_NODEFER
  #define SA_ONESHOT	SA_RESETHAND
  #define SA_INTERRUPT	0x20000000 /* dummy -- ignored */
  
  #define SA_RESTORER	0x04000000
  
  /*
   * sigaltstack controls
   */
  #define SS_ONSTACK	1
  #define SS_DISABLE	2
  
  #define MINSIGSTKSZ	2048
  #define SIGSTKSZ	8192
  
  #ifdef __KERNEL__
  
  /*
   * These values of sa_flags are used only by the kernel as part of the
   * irq handling routines.
   *
   * SA_INTERRUPT is also used by the irq handling routines.
   * SA_SHIRQ is for shared interrupt support on PCI and EISA.
   */
  #define SA_PROBE		SA_ONESHOT
  #define SA_SAMPLE_RANDOM	SA_RESTART
  #define SA_SHIRQ		0x04000000
  #endif
  
  #define SIG_BLOCK          0	/* for blocking signals */
  #define SIG_UNBLOCK        1	/* for unblocking signals */
  #define SIG_SETMASK        2	/* for setting the signal mask */
  
  /* Type of a signal handler.  */
  typedef void (*__sighandler_t)(int);
  
  #define SIG_DFL	((__sighandler_t)0)	/* default signal handling */
  #define SIG_IGN	((__sighandler_t)1)	/* ignore signal */
  #define SIG_ERR	((__sighandler_t)-1)	/* error return from signal */
  
  struct sigaction {
  	__sighandler_t sa_handler;
  	unsigned long sa_flags;
  	void (*sa_restorer)(void);
  	sigset_t sa_mask;		/* mask last for extensibility */
  };
  
  struct k_sigaction {
  	struct sigaction sa;
  };
  
  typedef struct sigaltstack {
  	void *ss_sp;
  	int ss_flags;
  	size_t ss_size;
  } stack_t;
  
  #ifdef __KERNEL__
  #include <asm/sigcontext.h>
  
  #undef __HAVE_ARCH_SIG_BITOPS
  #endif /* __KERNEL__ */
  
  #endif
  