signal.h

Go to the documentation of this file.

#ifndef _ASM_X86_SIGNAL_H
#define _ASM_X86_SIGNAL_H

#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/time.h>
#include <linux/compiler.h>

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

#ifdef __KERNEL__
#include <linux/linkage.h>

/* Most things should be clean enough to redefine this at will, if care
   is taken to make libc match.  */

#define _NSIG       64

#ifdef __i386__
# define _NSIG_BPW  32
#else
# define _NSIG_BPW  64
#endif

#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;

#ifndef CONFIG_COMPAT
typedef sigset_t compat_sigset_t;
#endif

#else
/* Here we must cater to libcs that poke about in kernel headers.  */

#define NSIG        32
typedef unsigned long sigset_t;

#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

#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

/*
 * SA_FLAGS values:
 *
 * SA_ONSTACK indicates that a registered stack_t will be used.
 * 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    0x00000001u
#define SA_NOCLDWAIT    0x00000002u
#define SA_SIGINFO  0x00000004u
#define SA_ONSTACK  0x08000000u
#define SA_RESTART  0x10000000u
#define SA_NODEFER  0x40000000u
#define SA_RESETHAND    0x80000000u

#define SA_NOMASK   SA_NODEFER
#define SA_ONESHOT  SA_RESETHAND

#define SA_RESTORER 0x04000000

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

#define MINSIGSTKSZ 2048
#define SIGSTKSZ    8192

#include <asm-generic/signal-defs.h>

#ifndef __ASSEMBLY__

# ifdef __KERNEL__
extern void do_notify_resume(struct pt_regs *, void *, __u32);
# endif /* __KERNEL__ */

#ifdef __i386__
# ifdef __KERNEL__
struct old_sigaction {
    __sighandler_t sa_handler;
    old_sigset_t sa_mask;
    unsigned long sa_flags;
    __sigrestore_t sa_restorer;
};

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

struct k_sigaction {
    struct sigaction sa;
};

# else /* __KERNEL__ */
/* 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__ */
#else /* __i386__ */

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

struct k_sigaction {
    struct sigaction sa;
};

#endif /* !__i386__ */

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

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

#ifdef __i386__

#define __HAVE_ARCH_SIG_BITOPS

#define sigaddset(set,sig)          \
    (__builtin_constant_p(sig)      \
     ? __const_sigaddset((set), (sig))  \
     : __gen_sigaddset((set), (sig)))

static inline void __gen_sigaddset(sigset_t *set, int _sig)
{
    asm("btsl %1,%0" : "+m"(*set) : "Ir"(_sig - 1) : "cc");
}

static inline void __const_sigaddset(sigset_t *set, int _sig)
{
    unsigned long sig = _sig - 1;
    set->sig[sig / _NSIG_BPW] |= 1 << (sig % _NSIG_BPW);
}

#define sigdelset(set, sig)         \
    (__builtin_constant_p(sig)      \
     ? __const_sigdelset((set), (sig))  \
     : __gen_sigdelset((set), (sig)))


static inline void __gen_sigdelset(sigset_t *set, int _sig)
{
    asm("btrl %1,%0" : "+m"(*set) : "Ir"(_sig - 1) : "cc");
}

static inline void __const_sigdelset(sigset_t *set, int _sig)
{
    unsigned long sig = _sig - 1;
    set->sig[sig / _NSIG_BPW] &= ~(1 << (sig % _NSIG_BPW));
}

static inline int __const_sigismember(sigset_t *set, int _sig)
{
    unsigned long sig = _sig - 1;
    return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
}

static inline int __gen_sigismember(sigset_t *set, int _sig)
{
    int ret;
    asm("btl %2,%1\n\tsbbl %0,%0"
        : "=r"(ret) : "m"(*set), "Ir"(_sig-1) : "cc");
    return ret;
}

#define sigismember(set, sig)           \
    (__builtin_constant_p(sig)      \
     ? __const_sigismember((set), (sig))    \
     : __gen_sigismember((set), (sig)))

static inline int sigfindinword(unsigned long word)
{
    asm("bsfl %1,%0" : "=r"(word) : "rm"(word) : "cc");
    return word;
}

struct pt_regs;

#else /* __i386__ */

#undef __HAVE_ARCH_SIG_BITOPS

#endif /* !__i386__ */

#define ptrace_signal_deliver(regs, cookie) do { } while (0)

#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_SIGNAL_H */