signal.h

《嵌入式系统设计与实例开发实验教材二源码》Linux内核移植与编译实验

#ifndef _ASMAXP_SIGNAL_H
#define _ASMAXP_SIGNAL_H

#include <linux/types.h>

/* Avoid too many header ordering problems.  */
struct siginfo;

#ifdef __KERNEL__
/* Digital Unix defines 64 signals.  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__ */


/*
 * Linux/AXP has different signal numbers that Linux/i386: I'm trying
 * to make it OSF/1 binary compatible, at least for normal binaries.
 */
#define SIGHUP		 1
#define SIGINT		 2
#define SIGQUIT		 3
#define SIGILL		 4
#define SIGTRAP		 5
#define SIGABRT		 6
#define SIGEMT		 7
#define SIGFPE		 8
#define SIGKILL		 9
#define SIGBUS		10
#define SIGSEGV		11
#define SIGSYS		12
#define SIGPIPE		13
#define SIGALRM		14
#define SIGTERM		15
#define SIGURG		16
#define SIGSTOP		17
#define SIGTSTP		18
#define SIGCONT		19
#define SIGCHLD		20
#define SIGTTIN		21
#define SIGTTOU		22
#define SIGIO		23
#define SIGXCPU		24
#define SIGXFSZ		25
#define SIGVTALRM	26
#define SIGPROF		27
#define SIGWINCH	28
#define SIGINFO		29
#define SIGUSR1		30
#define SIGUSR2		31

#define SIGPOLL	SIGIO
#define SIGPWR	SIGINFO
#define SIGIOT	SIGABRT

/* 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_ONSTACK	0x00000001
#define SA_RESTART	0x00000002
#define SA_NOCLDSTOP	0x00000004
#define SA_NODEFER	0x00000008
#define SA_RESETHAND	0x00000010
#define SA_NOCLDWAIT	0x00000020 /* not supported yet */
#define SA_SIGINFO	0x00000040

#define SA_ONESHOT	SA_RESETHAND
#define SA_NOMASK	SA_NODEFER
#define SA_INTERRUPT	0x20000000 /* dummy -- ignored */

/* 
 * sigaltstack controls
 */
#define SS_ONSTACK	1
#define SS_DISABLE	2

#define MINSIGSTKSZ	4096
#define SIGSTKSZ	16384


#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		0x40000000
#endif

#define SIG_BLOCK          1	/* for blocking signals */
#define SIG_UNBLOCK        2	/* for unblocking signals */
#define SIG_SETMASK        3	/* 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 */

#ifdef __KERNEL__
struct osf_sigaction {
	__sighandler_t	sa_handler;
	old_sigset_t	sa_mask;
	int		sa_flags;
};

struct sigaction {
	__sighandler_t	sa_handler;
	unsigned long	sa_flags;
	sigset_t	sa_mask;	/* mask last for extensibility */
};

struct k_sigaction {
	struct sigaction sa;
	void (*ka_restorer)(void);
};
#else
/* Here we must cater to libcs that poke about in kernel headers.  */

struct sigaction {
	union {
	  __sighandler_t	_sa_handler;
	  void (*_sa_sigaction)(int, struct siginfo *, void *);
	} _u;
	sigset_t	sa_mask;
	int		sa_flags;
};

#define sa_handler	_u._sa_handler
#define sa_sigaction	_u._sa_sigaction

#endif /* __KERNEL__ */

typedef struct sigaltstack {
	void *ss_sp;
	int ss_flags;
	size_t ss_size;
} stack_t;

/* sigstack(2) is deprecated, and will be withdrawn in a future version
   of the X/Open CAE Specification.  Use sigaltstack instead.  It is only
   implemented here for OSF/1 compatibility.  */

struct sigstack {
	void *ss_sp;
	int ss_onstack;
};

#ifdef __KERNEL__
#include <asm/sigcontext.h>
#endif

#endif