source: GPL/include/asm/signal.h@ 18

#ifndef _ASMi386_SIGNAL_H
#define _ASMi386_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       32
#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 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 */

#ifdef __KERNEL__
struct old_sigaction {
        __sighandler_t sa_handler;
        old_sigset_t sa_mask;
        unsigned long sa_flags;
        void (*sa_restorer)(void);
};

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;
};
#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;
        unsigned long sa_flags;
        void (*sa_restorer)(void);
};

#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;

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

#define __HAVE_ARCH_SIG_BITOPS

#endif /* __KERNEL__ */

#endif