[mirror_ubuntu-zesty-kernel.git] / include / linux / signal.h

#ifndef _LINUX_SIGNAL_H
#define _LINUX_SIGNAL_H

#include <linux/list.h>
#include <uapi/linux/signal.h>

struct task_struct;

/* for sysctl */
extern int print_fatal_signals;
/*
 * Real Time signals may be queued.
 */

struct sigqueue {
	struct list_head list;
	int flags;
	siginfo_t info;
	struct user_struct *user;
};

/* flags values. */
#define SIGQUEUE_PREALLOC	1

struct sigpending {
	struct list_head list;
	sigset_t signal;
};

/*
 * Define some primitives to manipulate sigset_t.
 */

#ifndef __HAVE_ARCH_SIG_BITOPS
#include <linux/bitops.h>

/* We don't use <linux/bitops.h> for these because there is no need to
   be atomic.  */
static inline void sigaddset(sigset_t *set, int _sig)
{
	unsigned long sig = _sig - 1;
	if (_NSIG_WORDS == 1)
		set->sig[0] |= 1UL << sig;
	else
		set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
}

static inline void sigdelset(sigset_t *set, int _sig)
{
	unsigned long sig = _sig - 1;
	if (_NSIG_WORDS == 1)
		set->sig[0] &= ~(1UL << sig);
	else
		set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
}

static inline int sigismember(sigset_t *set, int _sig)
{
	unsigned long sig = _sig - 1;
	if (_NSIG_WORDS == 1)
		return 1 & (set->sig[0] >> sig);
	else
		return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
}

#endif /* __HAVE_ARCH_SIG_BITOPS */

static inline int sigisemptyset(sigset_t *set)
{
	extern void _NSIG_WORDS_is_unsupported_size(void);
	switch (_NSIG_WORDS) {
	case 4:
		return (set->sig[3] | set->sig[2] |
			set->sig[1] | set->sig[0]) == 0;
	case 2:
		return (set->sig[1] | set->sig[0]) == 0;
	case 1:
		return set->sig[0] == 0;
	default:
		_NSIG_WORDS_is_unsupported_size();
		return 0;
	}
}

#define sigmask(sig)	(1UL << ((sig) - 1))

#ifndef __HAVE_ARCH_SIG_SETOPS
#include <linux/string.h>

#define _SIG_SET_BINOP(name, op)					\
static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
{									\
	extern void _NSIG_WORDS_is_unsupported_size(void);		\
	unsigned long a0, a1, a2, a3, b0, b1, b2, b3;			\
									\
	switch (_NSIG_WORDS) {						\
	    case 4:							\
		a3 = a->sig[3]; a2 = a->sig[2];				\
		b3 = b->sig[3]; b2 = b->sig[2];				\
		r->sig[3] = op(a3, b3);					\
		r->sig[2] = op(a2, b2);					\
	    case 2:							\
		a1 = a->sig[1]; b1 = b->sig[1];				\
		r->sig[1] = op(a1, b1);					\
	    case 1:							\
		a0 = a->sig[0]; b0 = b->sig[0];				\
		r->sig[0] = op(a0, b0);					\
		break;							\
	    default:							\
		_NSIG_WORDS_is_unsupported_size();			\
	}								\
}

#define _sig_or(x,y)	((x) | (y))
_SIG_SET_BINOP(sigorsets, _sig_or)

#define _sig_and(x,y)	((x) & (y))
_SIG_SET_BINOP(sigandsets, _sig_and)

#define _sig_andn(x,y)	((x) & ~(y))
_SIG_SET_BINOP(sigandnsets, _sig_andn)

#undef _SIG_SET_BINOP
#undef _sig_or
#undef _sig_and
#undef _sig_andn

#define _SIG_SET_OP(name, op)						\
static inline void name(sigset_t *set)					\
{									\
	extern void _NSIG_WORDS_is_unsupported_size(void);		\
									\
	switch (_NSIG_WORDS) {						\
	    case 4: set->sig[3] = op(set->sig[3]);			\
		    set->sig[2] = op(set->sig[2]);			\
	    case 2: set->sig[1] = op(set->sig[1]);			\
	    case 1: set->sig[0] = op(set->sig[0]);			\
		    break;						\
	    default:							\
		_NSIG_WORDS_is_unsupported_size();			\
	}								\
}

#define _sig_not(x)	(~(x))
_SIG_SET_OP(signotset, _sig_not)

#undef _SIG_SET_OP
#undef _sig_not

static inline void sigemptyset(sigset_t *set)
{
	switch (_NSIG_WORDS) {
	default:
		memset(set, 0, sizeof(sigset_t));
		break;
	case 2: set->sig[1] = 0;
	case 1:	set->sig[0] = 0;
		break;
	}
}

static inline void sigfillset(sigset_t *set)
{
	switch (_NSIG_WORDS) {
	default:
		memset(set, -1, sizeof(sigset_t));
		break;
	case 2: set->sig[1] = -1;
	case 1:	set->sig[0] = -1;
		break;
	}
}

/* Some extensions for manipulating the low 32 signals in particular.  */

static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
{
	set->sig[0] |= mask;
}

static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
{
	set->sig[0] &= ~mask;
}

static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
{
	return (set->sig[0] & mask) != 0;
}

static inline void siginitset(sigset_t *set, unsigned long mask)
{
	set->sig[0] = mask;
	switch (_NSIG_WORDS) {
	default:
		memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
		break;
	case 2: set->sig[1] = 0;
	case 1: ;
	}
}

static inline void siginitsetinv(sigset_t *set, unsigned long mask)
{
	set->sig[0] = ~mask;
	switch (_NSIG_WORDS) {
	default:
		memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
		break;
	case 2: set->sig[1] = -1;
	case 1: ;
	}
}

#endif /* __HAVE_ARCH_SIG_SETOPS */

static inline void init_sigpending(struct sigpending *sig)
{
	sigemptyset(&sig->signal);
	INIT_LIST_HEAD(&sig->list);
}

extern void flush_sigqueue(struct sigpending *queue);

/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
static inline int valid_signal(unsigned long sig)
{
	return sig <= _NSIG ? 1 : 0;
}

struct timespec;
struct pt_regs;

extern int next_signal(struct sigpending *pending, sigset_t *mask);
extern int do_send_sig_info(int sig, struct siginfo *info,
				struct task_struct *p, bool group);
extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
extern int do_sigtimedwait(const sigset_t *, siginfo_t *,
				const struct timespec *);
extern int sigprocmask(int, sigset_t *, sigset_t *);
extern void set_current_blocked(sigset_t *);
extern void __set_current_blocked(const sigset_t *);
extern int show_unhandled_signals;
extern int sigsuspend(sigset_t *);

struct sigaction {
#ifndef __ARCH_HAS_IRIX_SIGACTION
	__sighandler_t	sa_handler;
	unsigned long	sa_flags;
#else
	unsigned int	sa_flags;
	__sighandler_t	sa_handler;
#endif
#ifdef __ARCH_HAS_SA_RESTORER
	__sigrestore_t sa_restorer;
#endif
	sigset_t	sa_mask;	/* mask last for extensibility */
};

struct k_sigaction {
	struct sigaction sa;
#ifdef __ARCH_HAS_KA_RESTORER
	__sigrestore_t ka_restorer;
#endif
};
 
#ifdef CONFIG_OLD_SIGACTION
struct old_sigaction {
	__sighandler_t sa_handler;
	old_sigset_t sa_mask;
	unsigned long sa_flags;
	__sigrestore_t sa_restorer;
};
#endif

struct ksignal {
	struct k_sigaction ka;
	siginfo_t info;
	int sig;
};

extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
extern void exit_signals(struct task_struct *tsk);
extern void kernel_sigaction(int, __sighandler_t);

static inline void allow_signal(int sig)
{
	/*
	 * Kernel threads handle their own signals. Let the signal code
	 * know it'll be handled, so that they don't get converted to
	 * SIGKILL or just silently dropped.
	 */
	kernel_sigaction(sig, (__force __sighandler_t)2);
}

static inline void disallow_signal(int sig)
{
	kernel_sigaction(sig, SIG_IGN);
}

/*
 * Eventually that'll replace get_signal_to_deliver(); macro for now,
 * to avoid nastiness with include order.
 */
#define get_signal(ksig)					\
({								\
	struct ksignal *p = (ksig);				\
	p->sig = get_signal_to_deliver(&p->info, &p->ka,	\
					signal_pt_regs(), NULL);\
	p->sig > 0;						\
})

extern struct kmem_cache *sighand_cachep;

int unhandled_signal(struct task_struct *tsk, int sig);

/*
 * In POSIX a signal is sent either to a specific thread (Linux task)
 * or to the process as a whole (Linux thread group).  How the signal
 * is sent determines whether it's to one thread or the whole group,
 * which determines which signal mask(s) are involved in blocking it
 * from being delivered until later.  When the signal is delivered,
 * either it's caught or ignored by a user handler or it has a default
 * effect that applies to the whole thread group (POSIX process).
 *
 * The possible effects an unblocked signal set to SIG_DFL can have are:
 *   ignore	- Nothing Happens
 *   terminate	- kill the process, i.e. all threads in the group,
 * 		  similar to exit_group.  The group leader (only) reports
 *		  WIFSIGNALED status to its parent.
 *   coredump	- write a core dump file describing all threads using
 *		  the same mm and then kill all those threads
 *   stop 	- stop all the threads in the group, i.e. TASK_STOPPED state
 *
 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
 * Other signals when not blocked and set to SIG_DFL behaves as follows.
 * The job control signals also have other special effects.
 *
 *	+--------------------+------------------+
 *	|  POSIX signal      |  default action  |
 *	+--------------------+------------------+
 *	|  SIGHUP            |  terminate	|
 *	|  SIGINT            |	terminate	|
 *	|  SIGQUIT           |	coredump 	|
 *	|  SIGILL            |	coredump 	|
 *	|  SIGTRAP           |	coredump 	|
 *	|  SIGABRT/SIGIOT    |	coredump 	|
 *	|  SIGBUS            |	coredump 	|
 *	|  SIGFPE            |	coredump 	|
 *	|  SIGKILL           |	terminate(+)	|
 *	|  SIGUSR1           |	terminate	|
 *	|  SIGSEGV           |	coredump 	|
 *	|  SIGUSR2           |	terminate	|
 *	|  SIGPIPE           |	terminate	|
 *	|  SIGALRM           |	terminate	|
 *	|  SIGTERM           |	terminate	|
 *	|  SIGCHLD           |	ignore   	|
 *	|  SIGCONT           |	ignore(*)	|
 *	|  SIGSTOP           |	stop(*)(+)  	|
 *	|  SIGTSTP           |	stop(*)  	|
 *	|  SIGTTIN           |	stop(*)  	|
 *	|  SIGTTOU           |	stop(*)  	|
 *	|  SIGURG            |	ignore   	|
 *	|  SIGXCPU           |	coredump 	|
 *	|  SIGXFSZ           |	coredump 	|
 *	|  SIGVTALRM         |	terminate	|
 *	|  SIGPROF           |	terminate	|
 *	|  SIGPOLL/SIGIO     |	terminate	|
 *	|  SIGSYS/SIGUNUSED  |	coredump 	|
 *	|  SIGSTKFLT         |	terminate	|
 *	|  SIGWINCH          |	ignore   	|
 *	|  SIGPWR            |	terminate	|
 *	|  SIGRTMIN-SIGRTMAX |	terminate       |
 *	+--------------------+------------------+
 *	|  non-POSIX signal  |  default action  |
 *	+--------------------+------------------+
 *	|  SIGEMT            |  coredump	|
 *	+--------------------+------------------+
 *
 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
 * (*) Special job control effects:
 * When SIGCONT is sent, it resumes the process (all threads in the group)
 * from TASK_STOPPED state and also clears any pending/queued stop signals
 * (any of those marked with "stop(*)").  This happens regardless of blocking,
 * catching, or ignoring SIGCONT.  When any stop signal is sent, it clears
 * any pending/queued SIGCONT signals; this happens regardless of blocking,
 * catching, or ignored the stop signal, though (except for SIGSTOP) the
 * default action of stopping the process may happen later or never.
 */

#ifdef SIGEMT
#define SIGEMT_MASK	rt_sigmask(SIGEMT)
#else
#define SIGEMT_MASK	0
#endif

#if SIGRTMIN > BITS_PER_LONG
#define rt_sigmask(sig)	(1ULL << ((sig)-1))
#else
#define rt_sigmask(sig)	sigmask(sig)
#endif
#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))

#define SIG_KERNEL_ONLY_MASK (\
	rt_sigmask(SIGKILL)   |  rt_sigmask(SIGSTOP))

#define SIG_KERNEL_STOP_MASK (\
	rt_sigmask(SIGSTOP)   |  rt_sigmask(SIGTSTP)   | \
	rt_sigmask(SIGTTIN)   |  rt_sigmask(SIGTTOU)   )

#define SIG_KERNEL_COREDUMP_MASK (\
        rt_sigmask(SIGQUIT)   |  rt_sigmask(SIGILL)    | \
	rt_sigmask(SIGTRAP)   |  rt_sigmask(SIGABRT)   | \
        rt_sigmask(SIGFPE)    |  rt_sigmask(SIGSEGV)   | \
	rt_sigmask(SIGBUS)    |  rt_sigmask(SIGSYS)    | \
        rt_sigmask(SIGXCPU)   |  rt_sigmask(SIGXFSZ)   | \
	SIGEMT_MASK				       )

#define SIG_KERNEL_IGNORE_MASK (\
        rt_sigmask(SIGCONT)   |  rt_sigmask(SIGCHLD)   | \
	rt_sigmask(SIGWINCH)  |  rt_sigmask(SIGURG)    )

#define sig_kernel_only(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
#define sig_kernel_coredump(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
#define sig_kernel_ignore(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
#define sig_kernel_stop(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))

#define sig_user_defined(t, signr) \
	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) &&	\
	 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))

#define sig_fatal(t, signr) \
	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
	 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)

void signals_init(void);

int restore_altstack(const stack_t __user *);
int __save_altstack(stack_t __user *, unsigned long);

#define save_altstack_ex(uss, sp) do { \
	stack_t __user *__uss = uss; \
	struct task_struct *t = current; \
	put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
	put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
	put_user_ex(t->sas_ss_size, &__uss->ss_size); \
} while (0);

#ifdef CONFIG_PROC_FS
struct seq_file;
extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);
#endif

#endif /* _LINUX_SIGNAL_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SIGNAL_H
	2	#define _LINUX_SIGNAL_H
	3
7ab2febd	4	#include <linux/list.h>
607ca46e	5	#include <uapi/linux/signal.h>
1da177e4	6
1477fcc2 SR	7	struct task_struct;
1477fcc2 SR	8
d33ed52d DY	9	/* for sysctl */
d33ed52d DY	10	extern int print_fatal_signals;
1da177e4 LT	11	/*
	12	* Real Time signals may be queued.
	13	*/
	14
	15	struct sigqueue {
	16	struct list_head list;
1da177e4 LT	17	int flags;
	18	siginfo_t info;
	19	struct user_struct *user;
	20	};
	21
	22	/* flags values. */
	23	#define SIGQUEUE_PREALLOC 1
	24
	25	struct sigpending {
	26	struct list_head list;
	27	sigset_t signal;
	28	};
	29
	30	/*
	31	* Define some primitives to manipulate sigset_t.
	32	*/
	33
	34	#ifndef __HAVE_ARCH_SIG_BITOPS
	35	#include <linux/bitops.h>
	36
	37	/* We don't use <linux/bitops.h> for these because there is no need to
	38	be atomic. */
	39	static inline void sigaddset(sigset_t *set, int _sig)
	40	{
	41	unsigned long sig = _sig - 1;
	42	if (_NSIG_WORDS == 1)
	43	set->sig[0] \|= 1UL << sig;
	44	else
	45	set->sig[sig / _NSIG_BPW] \|= 1UL << (sig % _NSIG_BPW);
	46	}
	47
	48	static inline void sigdelset(sigset_t *set, int _sig)
	49	{
	50	unsigned long sig = _sig - 1;
	51	if (_NSIG_WORDS == 1)
	52	set->sig[0] &= ~(1UL << sig);
	53	else
	54	set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
	55	}
	56
	57	static inline int sigismember(sigset_t *set, int _sig)
	58	{
	59	unsigned long sig = _sig - 1;
	60	if (_NSIG_WORDS == 1)
	61	return 1 & (set->sig[0] >> sig);
	62	else
	63	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
	64	}
	65
1da177e4 LT	66	#endif /* __HAVE_ARCH_SIG_BITOPS */
1da177e4 LT	67
71fabd5e GA	68	static inline int sigisemptyset(sigset_t *set)
	69	{
	70	extern void _NSIG_WORDS_is_unsupported_size(void);
	71	switch (_NSIG_WORDS) {
	72	case 4:
	73	return (set->sig[3] \| set->sig[2] \|
	74	set->sig[1] \| set->sig[0]) == 0;
	75	case 2:
	76	return (set->sig[1] \| set->sig[0]) == 0;
	77	case 1:
	78	return set->sig[0] == 0;
	79	default:
	80	_NSIG_WORDS_is_unsupported_size();
	81	return 0;
	82	}
	83	}
	84
1da177e4 LT	85	#define sigmask(sig) (1UL << ((sig) - 1))
	86
	87	#ifndef __HAVE_ARCH_SIG_SETOPS
	88	#include <linux/string.h>
	89
	90	#define _SIG_SET_BINOP(name, op) \
	91	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	92	{ \
	93	extern void _NSIG_WORDS_is_unsupported_size(void); \
	94	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	95	\
	96	switch (_NSIG_WORDS) { \
	97	case 4: \
	98	a3 = a->sig[3]; a2 = a->sig[2]; \
	99	b3 = b->sig[3]; b2 = b->sig[2]; \
	100	r->sig[3] = op(a3, b3); \
	101	r->sig[2] = op(a2, b2); \
	102	case 2: \
	103	a1 = a->sig[1]; b1 = b->sig[1]; \
	104	r->sig[1] = op(a1, b1); \
	105	case 1: \
	106	a0 = a->sig[0]; b0 = b->sig[0]; \
	107	r->sig[0] = op(a0, b0); \
	108	break; \
	109	default: \
	110	_NSIG_WORDS_is_unsupported_size(); \
	111	} \
	112	}
	113
	114	#define _sig_or(x,y) ((x) \| (y))
	115	_SIG_SET_BINOP(sigorsets, _sig_or)
	116
	117	#define _sig_and(x,y) ((x) & (y))
	118	_SIG_SET_BINOP(sigandsets, _sig_and)
	119
702a5073 ON	120	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	121	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	122
	123	#undef _SIG_SET_BINOP
	124	#undef _sig_or
	125	#undef _sig_and
702a5073	126	#undef _sig_andn
1da177e4 LT	127
	128	#define _SIG_SET_OP(name, op) \
	129	static inline void name(sigset_t *set) \
	130	{ \
	131	extern void _NSIG_WORDS_is_unsupported_size(void); \
	132	\
	133	switch (_NSIG_WORDS) { \
	134	case 4: set->sig[3] = op(set->sig[3]); \
	135	set->sig[2] = op(set->sig[2]); \
	136	case 2: set->sig[1] = op(set->sig[1]); \
	137	case 1: set->sig[0] = op(set->sig[0]); \
	138	break; \
	139	default: \
	140	_NSIG_WORDS_is_unsupported_size(); \
	141	} \
	142	}
	143
	144	#define _sig_not(x) (~(x))
	145	_SIG_SET_OP(signotset, _sig_not)
	146
	147	#undef _SIG_SET_OP
	148	#undef _sig_not
	149
	150	static inline void sigemptyset(sigset_t *set)
	151	{
	152	switch (_NSIG_WORDS) {
	153	default:
	154	memset(set, 0, sizeof(sigset_t));
	155	break;
	156	case 2: set->sig[1] = 0;
	157	case 1: set->sig[0] = 0;
	158	break;
	159	}
	160	}
	161
	162	static inline void sigfillset(sigset_t *set)
	163	{
	164	switch (_NSIG_WORDS) {
	165	default:
	166	memset(set, -1, sizeof(sigset_t));
	167	break;
	168	case 2: set->sig[1] = -1;
	169	case 1: set->sig[0] = -1;
	170	break;
	171	}
	172	}
	173
	174	/* Some extensions for manipulating the low 32 signals in particular. */
	175
	176	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	177	{
	178	set->sig[0] \|= mask;
	179	}
	180
	181	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	182	{
	183	set->sig[0] &= ~mask;
	184	}
	185
	186	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	187	{
	188	return (set->sig[0] & mask) != 0;
	189	}
	190
191	static inline void siginitset(sigset_t *set, unsigned long mask)
192	{
193	set->sig[0] = mask;
194	switch (_NSIG_WORDS) {
195	default:
196	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
197	break;
198	case 2: set->sig[1] = 0;
199	case 1: ;
200	}
201	}
202
203	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
204	{
205	set->sig[0] = ~mask;
206	switch (_NSIG_WORDS) {
207	default:
208	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
209	break;
210	case 2: set->sig[1] = -1;
211	case 1: ;
212	}
213	}
214
215	#endif /* __HAVE_ARCH_SIG_SETOPS */
216
217	static inline void init_sigpending(struct sigpending *sig)
218	{
219	sigemptyset(&sig->signal);
220	INIT_LIST_HEAD(&sig->list);
221	}
222
6a14c5c9 ON	223	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	224
e5bdd883 JJ	225	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	226	static inline int valid_signal(unsigned long sig)
	227	{
	228	return sig <= _NSIG ? 1 : 0;
	229	}
	230
b2b07e4f ON	231	struct timespec;
	232	struct pt_regs;
	233
fba2afaa	234	extern int next_signal(struct sigpending pending, sigset_t mask);
4a30debf ON	235	extern int do_send_sig_info(int sig, struct siginfo *info,
4a30debf ON	236	struct task_struct *p, bool group);
1da177e4 LT	237	extern int group_send_sig_info(int sig, struct siginfo info, struct task_struct p);
1da177e4 LT	238	extern int __group_send_sig_info(int, struct siginfo , struct task_struct );
943df148 ON	239	extern int do_sigtimedwait(const sigset_t , siginfo_t ,
943df148 ON	240	const struct timespec *);
1da177e4	241	extern int sigprocmask(int, sigset_t , sigset_t );
77097ae5 AV	242	extern void set_current_blocked(sigset_t *);
77097ae5 AV	243	extern void __set_current_blocked(const sigset_t *);
abd4f750	244	extern int show_unhandled_signals;
68f3f16d	245	extern int sigsuspend(sigset_t *);
1da177e4	246
574c4866	247	struct sigaction {
2a148698	248	#ifndef __ARCH_HAS_IRIX_SIGACTION
574c4866 AV	249	__sighandler_t sa_handler;
	250	unsigned long sa_flags;
	251	#else
2a148698	252	unsigned int sa_flags;
574c4866 AV	253	__sighandler_t sa_handler;
	254	#endif
	255	#ifdef __ARCH_HAS_SA_RESTORER
	256	__sigrestore_t sa_restorer;
	257	#endif
	258	sigset_t sa_mask; /* mask last for extensibility */
	259	};
	260
92a3ce4a AV	261	struct k_sigaction {
	262	struct sigaction sa;
	263	#ifdef __ARCH_HAS_KA_RESTORER
	264	__sigrestore_t ka_restorer;
	265	#endif
	266	};
495dfbf7 AV	267
	268	#ifdef CONFIG_OLD_SIGACTION
	269	struct old_sigaction {
	270	__sighandler_t sa_handler;
	271	old_sigset_t sa_mask;
	272	unsigned long sa_flags;
	273	__sigrestore_t sa_restorer;
	274	};
	275	#endif
92a3ce4a	276
ca86b5dc AV	277	struct ksignal {
	278	struct k_sigaction ka;
	279	siginfo_t info;
	280	int sig;
	281	};
	282
1da177e4	283	extern int get_signal_to_deliver(siginfo_t info, struct k_sigaction return_ka, struct pt_regs regs, void cookie);
2ce5da17	284	extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
d12619b5	285	extern void exit_signals(struct task_struct *tsk);
b4e74264 ON	286	extern void kernel_sigaction(int, __sighandler_t);
	287
	288	static inline void allow_signal(int sig)
	289	{
	290	/*
	291	* Kernel threads handle their own signals. Let the signal code
	292	* know it'll be handled, so that they don't get converted to
	293	* SIGKILL or just silently dropped.
	294	*/
	295	kernel_sigaction(sig, (__force __sighandler_t)2);
	296	}
	297
	298	static inline void disallow_signal(int sig)
	299	{
	300	kernel_sigaction(sig, SIG_IGN);
	301	}
1da177e4	302
ca86b5dc AV	303	/*
	304	* Eventually that'll replace get_signal_to_deliver(); macro for now,
	305	* to avoid nastiness with include order.
	306	*/
	307	#define get_signal(ksig) \
	308	({ \
	309	struct ksignal *p = (ksig); \
	310	p->sig = get_signal_to_deliver(&p->info, &p->ka, \
	311	signal_pt_regs(), NULL);\
	312	p->sig > 0; \
	313	})
	314
298ec1e2 CL	315	extern struct kmem_cache *sighand_cachep;
298ec1e2 CL	316
abd4f750 MAS	317	int unhandled_signal(struct task_struct *tsk, int sig);
abd4f750 MAS	318
55c0d1f8 RM	319	/*
	320	* In POSIX a signal is sent either to a specific thread (Linux task)
	321	* or to the process as a whole (Linux thread group). How the signal
	322	* is sent determines whether it's to one thread or the whole group,
	323	* which determines which signal mask(s) are involved in blocking it
	324	* from being delivered until later. When the signal is delivered,
	325	* either it's caught or ignored by a user handler or it has a default
	326	* effect that applies to the whole thread group (POSIX process).
	327	*
	328	* The possible effects an unblocked signal set to SIG_DFL can have are:
	329	* ignore - Nothing Happens
	330	* terminate - kill the process, i.e. all threads in the group,
	331	* similar to exit_group. The group leader (only) reports
	332	* WIFSIGNALED status to its parent.
	333	* coredump - write a core dump file describing all threads using
	334	* the same mm and then kill all those threads
	335	* stop - stop all the threads in the group, i.e. TASK_STOPPED state
	336	*
	337	* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
	338	* Other signals when not blocked and set to SIG_DFL behaves as follows.
	339	* The job control signals also have other special effects.
	340	*
	341	* +--------------------+------------------+
	342	* \| POSIX signal \| default action \|
	343	* +--------------------+------------------+
	344	* \| SIGHUP \| terminate \|
	345	* \| SIGINT \| terminate \|
	346	* \| SIGQUIT \| coredump \|
	347	* \| SIGILL \| coredump \|
	348	* \| SIGTRAP \| coredump \|
	349	* \| SIGABRT/SIGIOT \| coredump \|
	350	* \| SIGBUS \| coredump \|
	351	* \| SIGFPE \| coredump \|
	352	* \| SIGKILL \| terminate(+) \|
	353	* \| SIGUSR1 \| terminate \|
	354	* \| SIGSEGV \| coredump \|
	355	* \| SIGUSR2 \| terminate \|
	356	* \| SIGPIPE \| terminate \|
	357	* \| SIGALRM \| terminate \|
	358	* \| SIGTERM \| terminate \|
	359	* \| SIGCHLD \| ignore \|
	360	* \| SIGCONT \| ignore(*) \|
	361	* \| SIGSTOP \| stop(*)(+) \|
	362	* \| SIGTSTP \| stop(*) \|
	363	* \| SIGTTIN \| stop(*) \|
	364	* \| SIGTTOU \| stop(*) \|
	365	* \| SIGURG \| ignore \|
	366	* \| SIGXCPU \| coredump \|
	367	* \| SIGXFSZ \| coredump \|
	368	* \| SIGVTALRM \| terminate \|
	369	* \| SIGPROF \| terminate \|
	370	* \| SIGPOLL/SIGIO \| terminate \|
	371	* \| SIGSYS/SIGUNUSED \| coredump \|
	372	* \| SIGSTKFLT \| terminate \|
	373	* \| SIGWINCH \| ignore \|
	374	* \| SIGPWR \| terminate \|
	375	* \| SIGRTMIN-SIGRTMAX \| terminate \|
	376	* +--------------------+------------------+
	377	* \| non-POSIX signal \| default action \|
	378	* +--------------------+------------------+
	379	* \| SIGEMT \| coredump \|
	380	* +--------------------+------------------+
	381	*
	382	* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
383	* (*) Special job control effects:
384	* When SIGCONT is sent, it resumes the process (all threads in the group)
385	* from TASK_STOPPED state and also clears any pending/queued stop signals
386	* (any of those marked with "stop(*)"). This happens regardless of blocking,
387	* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
388	* any pending/queued SIGCONT signals; this happens regardless of blocking,
389	* catching, or ignored the stop signal, though (except for SIGSTOP) the
390	* default action of stopping the process may happen later or never.
391	*/
392
393	#ifdef SIGEMT
394	#define SIGEMT_MASK rt_sigmask(SIGEMT)
395	#else
396	#define SIGEMT_MASK 0
397	#endif
398
399	#if SIGRTMIN > BITS_PER_LONG
400	#define rt_sigmask(sig) (1ULL << ((sig)-1))
401	#else
402	#define rt_sigmask(sig) sigmask(sig)
403	#endif
404	#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
405
406	#define SIG_KERNEL_ONLY_MASK (\
407	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
408
409	#define SIG_KERNEL_STOP_MASK (\
410	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
411	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
412
413	#define SIG_KERNEL_COREDUMP_MASK (\
414	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
415	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
416	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
417	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
418	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
419	SIGEMT_MASK )
420
421	#define SIG_KERNEL_IGNORE_MASK (\
422	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
423	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
424
425	#define sig_kernel_only(sig) \
426	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
427	#define sig_kernel_coredump(sig) \
428	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
429	#define sig_kernel_ignore(sig) \
430	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
431	#define sig_kernel_stop(sig) \
432	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
433
55c0d1f8 RM	434	#define sig_user_defined(t, signr) \
	435	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
	436	((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
	437
	438	#define sig_fatal(t, signr) \
	439	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	440	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	441
a1c9eea9 AB	442	void signals_init(void);
a1c9eea9 AB	443
5c49574f	444	int restore_altstack(const stack_t __user *);
c40702c4	445	int __save_altstack(stack_t __user *, unsigned long);
5c49574f	446
bd1c149a AV	447	#define save_altstack_ex(uss, sp) do { \
	448	stack_t __user *__uss = uss; \
	449	struct task_struct *t = current; \
	450	put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
	451	put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
	452	put_user_ex(t->sas_ss_size, &__uss->ss_size); \
	453	} while (0);
	454
34db8aaf DH	455	#ifdef CONFIG_PROC_FS
	456	struct seq_file;
	457	extern void render_sigset_t(struct seq_file , const char , sigset_t *);
	458	#endif
	459
1da177e4	460	#endif /* _LINUX_SIGNAL_H */