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

#ifndef _LINUX_SIGNAL_H
#define _LINUX_SIGNAL_H

#include <asm/signal.h>
#include <asm/siginfo.h>

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

/* 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));
}

static inline int sigfindinword(unsigned long word)
{
	return ffz(~word);
}

#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;
}

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 long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
				 siginfo_t *info);
extern long do_sigpending(void __user *, unsigned long);
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(const sigset_t *);
extern int show_unhandled_signals;

struct pt_regs;
extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
extern void exit_signals(struct task_struct *tsk);

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);

#endif /* __KERNEL__ */

#endif /* _LINUX_SIGNAL_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SIGNAL_H
	2	#define _LINUX_SIGNAL_H
	3
1da177e4 LT	4	#include <asm/signal.h>
	5	#include <asm/siginfo.h>
	6
	7	#ifdef __KERNEL__
7ab2febd	8	#include <linux/list.h>
1da177e4	9
d33ed52d DY	10	/* for sysctl */
d33ed52d DY	11	extern int print_fatal_signals;
1da177e4 LT	12	/*
	13	* Real Time signals may be queued.
	14	*/
	15
	16	struct sigqueue {
	17	struct list_head list;
1da177e4 LT	18	int flags;
	19	siginfo_t info;
	20	struct user_struct *user;
	21	};
	22
	23	/* flags values. */
	24	#define SIGQUEUE_PREALLOC 1
	25
	26	struct sigpending {
	27	struct list_head list;
	28	sigset_t signal;
	29	};
	30
	31	/*
	32	* Define some primitives to manipulate sigset_t.
	33	*/
	34
	35	#ifndef __HAVE_ARCH_SIG_BITOPS
	36	#include <linux/bitops.h>
	37
	38	/* We don't use <linux/bitops.h> for these because there is no need to
	39	be atomic. */
	40	static inline void sigaddset(sigset_t *set, int _sig)
	41	{
	42	unsigned long sig = _sig - 1;
	43	if (_NSIG_WORDS == 1)
	44	set->sig[0] \|= 1UL << sig;
	45	else
	46	set->sig[sig / _NSIG_BPW] \|= 1UL << (sig % _NSIG_BPW);
	47	}
	48
	49	static inline void sigdelset(sigset_t *set, int _sig)
	50	{
	51	unsigned long sig = _sig - 1;
	52	if (_NSIG_WORDS == 1)
	53	set->sig[0] &= ~(1UL << sig);
	54	else
	55	set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
	56	}
	57
	58	static inline int sigismember(sigset_t *set, int _sig)
	59	{
	60	unsigned long sig = _sig - 1;
	61	if (_NSIG_WORDS == 1)
	62	return 1 & (set->sig[0] >> sig);
	63	else
	64	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
	65	}
	66
	67	static inline int sigfindinword(unsigned long word)
	68	{
	69	return ffz(~word);
	70	}
	71
	72	#endif /* __HAVE_ARCH_SIG_BITOPS */
	73
71fabd5e GA	74	static inline int sigisemptyset(sigset_t *set)
	75	{
	76	extern void _NSIG_WORDS_is_unsupported_size(void);
	77	switch (_NSIG_WORDS) {
	78	case 4:
	79	return (set->sig[3] \| set->sig[2] \|
	80	set->sig[1] \| set->sig[0]) == 0;
	81	case 2:
	82	return (set->sig[1] \| set->sig[0]) == 0;
	83	case 1:
	84	return set->sig[0] == 0;
	85	default:
	86	_NSIG_WORDS_is_unsupported_size();
	87	return 0;
	88	}
	89	}
	90
1da177e4 LT	91	#define sigmask(sig) (1UL << ((sig) - 1))
	92
	93	#ifndef __HAVE_ARCH_SIG_SETOPS
	94	#include <linux/string.h>
	95
	96	#define _SIG_SET_BINOP(name, op) \
	97	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	98	{ \
	99	extern void _NSIG_WORDS_is_unsupported_size(void); \
	100	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	101	\
	102	switch (_NSIG_WORDS) { \
	103	case 4: \
	104	a3 = a->sig[3]; a2 = a->sig[2]; \
	105	b3 = b->sig[3]; b2 = b->sig[2]; \
	106	r->sig[3] = op(a3, b3); \
	107	r->sig[2] = op(a2, b2); \
	108	case 2: \
	109	a1 = a->sig[1]; b1 = b->sig[1]; \
	110	r->sig[1] = op(a1, b1); \
	111	case 1: \
	112	a0 = a->sig[0]; b0 = b->sig[0]; \
	113	r->sig[0] = op(a0, b0); \
	114	break; \
	115	default: \
	116	_NSIG_WORDS_is_unsupported_size(); \
	117	} \
	118	}
	119
	120	#define _sig_or(x,y) ((x) \| (y))
	121	_SIG_SET_BINOP(sigorsets, _sig_or)
	122
	123	#define _sig_and(x,y) ((x) & (y))
	124	_SIG_SET_BINOP(sigandsets, _sig_and)
	125
702a5073 ON	126	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	127	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	128
	129	#undef _SIG_SET_BINOP
	130	#undef _sig_or
	131	#undef _sig_and
702a5073	132	#undef _sig_andn
1da177e4 LT	133
	134	#define _SIG_SET_OP(name, op) \
	135	static inline void name(sigset_t *set) \
	136	{ \
	137	extern void _NSIG_WORDS_is_unsupported_size(void); \
	138	\
	139	switch (_NSIG_WORDS) { \
	140	case 4: set->sig[3] = op(set->sig[3]); \
	141	set->sig[2] = op(set->sig[2]); \
	142	case 2: set->sig[1] = op(set->sig[1]); \
	143	case 1: set->sig[0] = op(set->sig[0]); \
	144	break; \
	145	default: \
	146	_NSIG_WORDS_is_unsupported_size(); \
	147	} \
	148	}
	149
	150	#define _sig_not(x) (~(x))
	151	_SIG_SET_OP(signotset, _sig_not)
	152
	153	#undef _SIG_SET_OP
	154	#undef _sig_not
	155
	156	static inline void sigemptyset(sigset_t *set)
	157	{
	158	switch (_NSIG_WORDS) {
	159	default:
	160	memset(set, 0, sizeof(sigset_t));
	161	break;
	162	case 2: set->sig[1] = 0;
	163	case 1: set->sig[0] = 0;
	164	break;
	165	}
	166	}
	167
	168	static inline void sigfillset(sigset_t *set)
	169	{
	170	switch (_NSIG_WORDS) {
	171	default:
	172	memset(set, -1, sizeof(sigset_t));
	173	break;
	174	case 2: set->sig[1] = -1;
	175	case 1: set->sig[0] = -1;
	176	break;
	177	}
	178	}
	179
	180	/* Some extensions for manipulating the low 32 signals in particular. */
	181
	182	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	183	{
	184	set->sig[0] \|= mask;
	185	}
	186
	187	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	188	{
	189	set->sig[0] &= ~mask;
	190	}
	191
	192	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	193	{
	194	return (set->sig[0] & mask) != 0;
	195	}
	196
197	static inline void siginitset(sigset_t *set, unsigned long mask)
198	{
199	set->sig[0] = mask;
200	switch (_NSIG_WORDS) {
201	default:
202	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
203	break;
204	case 2: set->sig[1] = 0;
205	case 1: ;
206	}
207	}
208
209	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
210	{
211	set->sig[0] = ~mask;
212	switch (_NSIG_WORDS) {
213	default:
214	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
215	break;
216	case 2: set->sig[1] = -1;
217	case 1: ;
218	}
219	}
220
221	#endif /* __HAVE_ARCH_SIG_SETOPS */
222
223	static inline void init_sigpending(struct sigpending *sig)
224	{
225	sigemptyset(&sig->signal);
226	INIT_LIST_HEAD(&sig->list);
227	}
228
6a14c5c9 ON	229	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	230
e5bdd883 JJ	231	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	232	static inline int valid_signal(unsigned long sig)
	233	{
	234	return sig <= _NSIG ? 1 : 0;
	235	}
	236
fba2afaa	237	extern int next_signal(struct sigpending pending, sigset_t mask);
4a30debf ON	238	extern int do_send_sig_info(int sig, struct siginfo *info,
4a30debf ON	239	struct task_struct *p, bool group);
1da177e4 LT	240	extern int group_send_sig_info(int sig, struct siginfo info, struct task_struct p);
1da177e4 LT	241	extern int __group_send_sig_info(int, struct siginfo , struct task_struct );
62ab4505 TG	242	extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
62ab4505 TG	243	siginfo_t *info);
1da177e4	244	extern long do_sigpending(void __user *, unsigned long);
943df148 ON	245	extern int do_sigtimedwait(const sigset_t , siginfo_t ,
943df148 ON	246	const struct timespec *);
1da177e4	247	extern int sigprocmask(int, sigset_t , sigset_t );
e6fa16ab	248	extern void set_current_blocked(const sigset_t *);
abd4f750	249	extern int show_unhandled_signals;
1da177e4	250
1da177e4 LT	251	struct pt_regs;
1da177e4 LT	252	extern int get_signal_to_deliver(siginfo_t info, struct k_sigaction return_ka, struct pt_regs regs, void cookie);
d12619b5	253	extern void exit_signals(struct task_struct *tsk);
1da177e4	254
298ec1e2 CL	255	extern struct kmem_cache *sighand_cachep;
298ec1e2 CL	256
abd4f750 MAS	257	int unhandled_signal(struct task_struct *tsk, int sig);
abd4f750 MAS	258
55c0d1f8 RM	259	/*
	260	* In POSIX a signal is sent either to a specific thread (Linux task)
	261	* or to the process as a whole (Linux thread group). How the signal
	262	* is sent determines whether it's to one thread or the whole group,
	263	* which determines which signal mask(s) are involved in blocking it
	264	* from being delivered until later. When the signal is delivered,
	265	* either it's caught or ignored by a user handler or it has a default
	266	* effect that applies to the whole thread group (POSIX process).
	267	*
	268	* The possible effects an unblocked signal set to SIG_DFL can have are:
	269	* ignore - Nothing Happens
	270	* terminate - kill the process, i.e. all threads in the group,
	271	* similar to exit_group. The group leader (only) reports
	272	* WIFSIGNALED status to its parent.
	273	* coredump - write a core dump file describing all threads using
	274	* the same mm and then kill all those threads
	275	* stop - stop all the threads in the group, i.e. TASK_STOPPED state
	276	*
	277	* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
	278	* Other signals when not blocked and set to SIG_DFL behaves as follows.
	279	* The job control signals also have other special effects.
	280	*
	281	* +--------------------+------------------+
	282	* \| POSIX signal \| default action \|
	283	* +--------------------+------------------+
	284	* \| SIGHUP \| terminate \|
	285	* \| SIGINT \| terminate \|
	286	* \| SIGQUIT \| coredump \|
	287	* \| SIGILL \| coredump \|
	288	* \| SIGTRAP \| coredump \|
	289	* \| SIGABRT/SIGIOT \| coredump \|
	290	* \| SIGBUS \| coredump \|
	291	* \| SIGFPE \| coredump \|
	292	* \| SIGKILL \| terminate(+) \|
	293	* \| SIGUSR1 \| terminate \|
	294	* \| SIGSEGV \| coredump \|
	295	* \| SIGUSR2 \| terminate \|
	296	* \| SIGPIPE \| terminate \|
	297	* \| SIGALRM \| terminate \|
	298	* \| SIGTERM \| terminate \|
	299	* \| SIGCHLD \| ignore \|
	300	* \| SIGCONT \| ignore(*) \|
	301	* \| SIGSTOP \| stop(*)(+) \|
	302	* \| SIGTSTP \| stop(*) \|
	303	* \| SIGTTIN \| stop(*) \|
	304	* \| SIGTTOU \| stop(*) \|
	305	* \| SIGURG \| ignore \|
	306	* \| SIGXCPU \| coredump \|
	307	* \| SIGXFSZ \| coredump \|
	308	* \| SIGVTALRM \| terminate \|
	309	* \| SIGPROF \| terminate \|
	310	* \| SIGPOLL/SIGIO \| terminate \|
	311	* \| SIGSYS/SIGUNUSED \| coredump \|
	312	* \| SIGSTKFLT \| terminate \|
	313	* \| SIGWINCH \| ignore \|
	314	* \| SIGPWR \| terminate \|
	315	* \| SIGRTMIN-SIGRTMAX \| terminate \|
	316	* +--------------------+------------------+
	317	* \| non-POSIX signal \| default action \|
	318	* +--------------------+------------------+
	319	* \| SIGEMT \| coredump \|
	320	* +--------------------+------------------+
	321	*
	322	* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
323	* (*) Special job control effects:
324	* When SIGCONT is sent, it resumes the process (all threads in the group)
325	* from TASK_STOPPED state and also clears any pending/queued stop signals
326	* (any of those marked with "stop(*)"). This happens regardless of blocking,
327	* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
328	* any pending/queued SIGCONT signals; this happens regardless of blocking,
329	* catching, or ignored the stop signal, though (except for SIGSTOP) the
330	* default action of stopping the process may happen later or never.
331	*/
332
333	#ifdef SIGEMT
334	#define SIGEMT_MASK rt_sigmask(SIGEMT)
335	#else
336	#define SIGEMT_MASK 0
337	#endif
338
339	#if SIGRTMIN > BITS_PER_LONG
340	#define rt_sigmask(sig) (1ULL << ((sig)-1))
341	#else
342	#define rt_sigmask(sig) sigmask(sig)
343	#endif
344	#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
345
346	#define SIG_KERNEL_ONLY_MASK (\
347	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
348
349	#define SIG_KERNEL_STOP_MASK (\
350	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
351	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
352
353	#define SIG_KERNEL_COREDUMP_MASK (\
354	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
355	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
356	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
357	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
358	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
359	SIGEMT_MASK )
360
361	#define SIG_KERNEL_IGNORE_MASK (\
362	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
363	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
364
365	#define sig_kernel_only(sig) \
366	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
367	#define sig_kernel_coredump(sig) \
368	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
369	#define sig_kernel_ignore(sig) \
370	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
371	#define sig_kernel_stop(sig) \
372	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
373
55c0d1f8 RM	374	#define sig_user_defined(t, signr) \
	375	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
	376	((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
	377
	378	#define sig_fatal(t, signr) \
	379	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	380	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	381
a1c9eea9 AB	382	void signals_init(void);
a1c9eea9 AB	383
1da177e4 LT	384	#endif /* __KERNEL__ */
	385
	386	#endif /* _LINUX_SIGNAL_H */