[GitHub/mt8127/android_kernel_alcatel_ttab.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>

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));
}

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;
}

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 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(sigset_t *);
extern void __set_current_blocked(const sigset_t *);
extern int show_unhandled_signals;
extern int sigsuspend(sigset_t *);

extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
extern void block_sigmask(struct k_sigaction *ka, int signr);
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
1477fcc2 SR	10	struct task_struct;
1477fcc2 SR	11
d33ed52d DY	12	/* for sysctl */
d33ed52d DY	13	extern int print_fatal_signals;
1da177e4 LT	14	/*
	15	* Real Time signals may be queued.
	16	*/
	17
	18	struct sigqueue {
	19	struct list_head list;
1da177e4 LT	20	int flags;
	21	siginfo_t info;
	22	struct user_struct *user;
	23	};
	24
	25	/* flags values. */
	26	#define SIGQUEUE_PREALLOC 1
	27
	28	struct sigpending {
	29	struct list_head list;
	30	sigset_t signal;
	31	};
	32
	33	/*
	34	* Define some primitives to manipulate sigset_t.
	35	*/
	36
	37	#ifndef __HAVE_ARCH_SIG_BITOPS
	38	#include <linux/bitops.h>
	39
	40	/* We don't use <linux/bitops.h> for these because there is no need to
	41	be atomic. */
	42	static inline void sigaddset(sigset_t *set, int _sig)
	43	{
	44	unsigned long sig = _sig - 1;
	45	if (_NSIG_WORDS == 1)
	46	set->sig[0] \|= 1UL << sig;
	47	else
	48	set->sig[sig / _NSIG_BPW] \|= 1UL << (sig % _NSIG_BPW);
	49	}
	50
	51	static inline void sigdelset(sigset_t *set, int _sig)
	52	{
	53	unsigned long sig = _sig - 1;
	54	if (_NSIG_WORDS == 1)
	55	set->sig[0] &= ~(1UL << sig);
	56	else
	57	set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
	58	}
	59
	60	static inline int sigismember(sigset_t *set, int _sig)
	61	{
	62	unsigned long sig = _sig - 1;
	63	if (_NSIG_WORDS == 1)
	64	return 1 & (set->sig[0] >> sig);
	65	else
	66	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
	67	}
	68
	69	static inline int sigfindinword(unsigned long word)
	70	{
	71	return ffz(~word);
	72	}
	73
	74	#endif /* __HAVE_ARCH_SIG_BITOPS */
	75
71fabd5e GA	76	static inline int sigisemptyset(sigset_t *set)
	77	{
	78	extern void _NSIG_WORDS_is_unsupported_size(void);
	79	switch (_NSIG_WORDS) {
	80	case 4:
	81	return (set->sig[3] \| set->sig[2] \|
	82	set->sig[1] \| set->sig[0]) == 0;
	83	case 2:
	84	return (set->sig[1] \| set->sig[0]) == 0;
	85	case 1:
	86	return set->sig[0] == 0;
	87	default:
	88	_NSIG_WORDS_is_unsupported_size();
	89	return 0;
	90	}
	91	}
	92
1da177e4 LT	93	#define sigmask(sig) (1UL << ((sig) - 1))
	94
	95	#ifndef __HAVE_ARCH_SIG_SETOPS
	96	#include <linux/string.h>
	97
	98	#define _SIG_SET_BINOP(name, op) \
	99	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	100	{ \
	101	extern void _NSIG_WORDS_is_unsupported_size(void); \
	102	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	103	\
	104	switch (_NSIG_WORDS) { \
	105	case 4: \
	106	a3 = a->sig[3]; a2 = a->sig[2]; \
	107	b3 = b->sig[3]; b2 = b->sig[2]; \
	108	r->sig[3] = op(a3, b3); \
	109	r->sig[2] = op(a2, b2); \
	110	case 2: \
	111	a1 = a->sig[1]; b1 = b->sig[1]; \
	112	r->sig[1] = op(a1, b1); \
	113	case 1: \
	114	a0 = a->sig[0]; b0 = b->sig[0]; \
	115	r->sig[0] = op(a0, b0); \
	116	break; \
	117	default: \
	118	_NSIG_WORDS_is_unsupported_size(); \
	119	} \
	120	}
	121
	122	#define _sig_or(x,y) ((x) \| (y))
	123	_SIG_SET_BINOP(sigorsets, _sig_or)
	124
	125	#define _sig_and(x,y) ((x) & (y))
	126	_SIG_SET_BINOP(sigandsets, _sig_and)
	127
702a5073 ON	128	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	129	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	130
	131	#undef _SIG_SET_BINOP
	132	#undef _sig_or
	133	#undef _sig_and
702a5073	134	#undef _sig_andn
1da177e4 LT	135
	136	#define _SIG_SET_OP(name, op) \
	137	static inline void name(sigset_t *set) \
	138	{ \
	139	extern void _NSIG_WORDS_is_unsupported_size(void); \
	140	\
	141	switch (_NSIG_WORDS) { \
	142	case 4: set->sig[3] = op(set->sig[3]); \
	143	set->sig[2] = op(set->sig[2]); \
	144	case 2: set->sig[1] = op(set->sig[1]); \
	145	case 1: set->sig[0] = op(set->sig[0]); \
	146	break; \
	147	default: \
	148	_NSIG_WORDS_is_unsupported_size(); \
	149	} \
	150	}
	151
	152	#define _sig_not(x) (~(x))
	153	_SIG_SET_OP(signotset, _sig_not)
	154
	155	#undef _SIG_SET_OP
	156	#undef _sig_not
	157
	158	static inline void sigemptyset(sigset_t *set)
	159	{
	160	switch (_NSIG_WORDS) {
	161	default:
	162	memset(set, 0, sizeof(sigset_t));
	163	break;
	164	case 2: set->sig[1] = 0;
	165	case 1: set->sig[0] = 0;
	166	break;
	167	}
	168	}
	169
	170	static inline void sigfillset(sigset_t *set)
	171	{
	172	switch (_NSIG_WORDS) {
	173	default:
	174	memset(set, -1, sizeof(sigset_t));
	175	break;
	176	case 2: set->sig[1] = -1;
	177	case 1: set->sig[0] = -1;
	178	break;
	179	}
	180	}
	181
	182	/* Some extensions for manipulating the low 32 signals in particular. */
	183
	184	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	185	{
	186	set->sig[0] \|= mask;
	187	}
	188
	189	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	190	{
	191	set->sig[0] &= ~mask;
	192	}
	193
	194	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	195	{
	196	return (set->sig[0] & mask) != 0;
	197	}
	198
199	static inline void siginitset(sigset_t *set, unsigned long mask)
200	{
201	set->sig[0] = mask;
202	switch (_NSIG_WORDS) {
203	default:
204	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
205	break;
206	case 2: set->sig[1] = 0;
207	case 1: ;
208	}
209	}
210
211	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
212	{
213	set->sig[0] = ~mask;
214	switch (_NSIG_WORDS) {
215	default:
216	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
217	break;
218	case 2: set->sig[1] = -1;
219	case 1: ;
220	}
221	}
222
223	#endif /* __HAVE_ARCH_SIG_SETOPS */
224
225	static inline void init_sigpending(struct sigpending *sig)
226	{
227	sigemptyset(&sig->signal);
228	INIT_LIST_HEAD(&sig->list);
229	}
230
6a14c5c9 ON	231	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	232
e5bdd883 JJ	233	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	234	static inline int valid_signal(unsigned long sig)
	235	{
	236	return sig <= _NSIG ? 1 : 0;
	237	}
	238
b2b07e4f ON	239	struct timespec;
	240	struct pt_regs;
	241
fba2afaa	242	extern int next_signal(struct sigpending pending, sigset_t mask);
4a30debf ON	243	extern int do_send_sig_info(int sig, struct siginfo *info,
4a30debf ON	244	struct task_struct *p, bool group);
1da177e4 LT	245	extern int group_send_sig_info(int sig, struct siginfo info, struct task_struct p);
1da177e4 LT	246	extern int __group_send_sig_info(int, struct siginfo , struct task_struct );
62ab4505 TG	247	extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
62ab4505 TG	248	siginfo_t *info);
1da177e4	249	extern long do_sigpending(void __user *, unsigned long);
943df148 ON	250	extern int do_sigtimedwait(const sigset_t , siginfo_t ,
943df148 ON	251	const struct timespec *);
1da177e4	252	extern int sigprocmask(int, sigset_t , sigset_t );
77097ae5 AV	253	extern void set_current_blocked(sigset_t *);
77097ae5 AV	254	extern void __set_current_blocked(const sigset_t *);
abd4f750	255	extern int show_unhandled_signals;
68f3f16d	256	extern int sigsuspend(sigset_t *);
1da177e4	257
1da177e4	258	extern int get_signal_to_deliver(siginfo_t info, struct k_sigaction return_ka, struct pt_regs regs, void cookie);
5e6292c0	259	extern void block_sigmask(struct k_sigaction *ka, int signr);
d12619b5	260	extern void exit_signals(struct task_struct *tsk);
1da177e4	261
298ec1e2 CL	262	extern struct kmem_cache *sighand_cachep;
298ec1e2 CL	263
abd4f750 MAS	264	int unhandled_signal(struct task_struct *tsk, int sig);
abd4f750 MAS	265
55c0d1f8 RM	266	/*
	267	* In POSIX a signal is sent either to a specific thread (Linux task)
	268	* or to the process as a whole (Linux thread group). How the signal
	269	* is sent determines whether it's to one thread or the whole group,
	270	* which determines which signal mask(s) are involved in blocking it
	271	* from being delivered until later. When the signal is delivered,
	272	* either it's caught or ignored by a user handler or it has a default
	273	* effect that applies to the whole thread group (POSIX process).
	274	*
	275	* The possible effects an unblocked signal set to SIG_DFL can have are:
	276	* ignore - Nothing Happens
	277	* terminate - kill the process, i.e. all threads in the group,
	278	* similar to exit_group. The group leader (only) reports
	279	* WIFSIGNALED status to its parent.
	280	* coredump - write a core dump file describing all threads using
	281	* the same mm and then kill all those threads
	282	* stop - stop all the threads in the group, i.e. TASK_STOPPED state
	283	*
	284	* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
	285	* Other signals when not blocked and set to SIG_DFL behaves as follows.
	286	* The job control signals also have other special effects.
	287	*
	288	* +--------------------+------------------+
	289	* \| POSIX signal \| default action \|
	290	* +--------------------+------------------+
	291	* \| SIGHUP \| terminate \|
	292	* \| SIGINT \| terminate \|
	293	* \| SIGQUIT \| coredump \|
	294	* \| SIGILL \| coredump \|
	295	* \| SIGTRAP \| coredump \|
	296	* \| SIGABRT/SIGIOT \| coredump \|
	297	* \| SIGBUS \| coredump \|
	298	* \| SIGFPE \| coredump \|
	299	* \| SIGKILL \| terminate(+) \|
	300	* \| SIGUSR1 \| terminate \|
	301	* \| SIGSEGV \| coredump \|
	302	* \| SIGUSR2 \| terminate \|
	303	* \| SIGPIPE \| terminate \|
	304	* \| SIGALRM \| terminate \|
	305	* \| SIGTERM \| terminate \|
	306	* \| SIGCHLD \| ignore \|
	307	* \| SIGCONT \| ignore(*) \|
	308	* \| SIGSTOP \| stop(*)(+) \|
	309	* \| SIGTSTP \| stop(*) \|
	310	* \| SIGTTIN \| stop(*) \|
	311	* \| SIGTTOU \| stop(*) \|
	312	* \| SIGURG \| ignore \|
	313	* \| SIGXCPU \| coredump \|
	314	* \| SIGXFSZ \| coredump \|
	315	* \| SIGVTALRM \| terminate \|
	316	* \| SIGPROF \| terminate \|
	317	* \| SIGPOLL/SIGIO \| terminate \|
	318	* \| SIGSYS/SIGUNUSED \| coredump \|
	319	* \| SIGSTKFLT \| terminate \|
	320	* \| SIGWINCH \| ignore \|
	321	* \| SIGPWR \| terminate \|
	322	* \| SIGRTMIN-SIGRTMAX \| terminate \|
	323	* +--------------------+------------------+
	324	* \| non-POSIX signal \| default action \|
	325	* +--------------------+------------------+
	326	* \| SIGEMT \| coredump \|
	327	* +--------------------+------------------+
	328	*
	329	* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
330	* (*) Special job control effects:
331	* When SIGCONT is sent, it resumes the process (all threads in the group)
332	* from TASK_STOPPED state and also clears any pending/queued stop signals
333	* (any of those marked with "stop(*)"). This happens regardless of blocking,
334	* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
335	* any pending/queued SIGCONT signals; this happens regardless of blocking,
336	* catching, or ignored the stop signal, though (except for SIGSTOP) the
337	* default action of stopping the process may happen later or never.
338	*/
339
340	#ifdef SIGEMT
341	#define SIGEMT_MASK rt_sigmask(SIGEMT)
342	#else
343	#define SIGEMT_MASK 0
344	#endif
345
346	#if SIGRTMIN > BITS_PER_LONG
347	#define rt_sigmask(sig) (1ULL << ((sig)-1))
348	#else
349	#define rt_sigmask(sig) sigmask(sig)
350	#endif
351	#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
352
353	#define SIG_KERNEL_ONLY_MASK (\
354	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
355
356	#define SIG_KERNEL_STOP_MASK (\
357	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
358	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
359
360	#define SIG_KERNEL_COREDUMP_MASK (\
361	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
362	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
363	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
364	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
365	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
366	SIGEMT_MASK )
367
368	#define SIG_KERNEL_IGNORE_MASK (\
369	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
370	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
371
372	#define sig_kernel_only(sig) \
373	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
374	#define sig_kernel_coredump(sig) \
375	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
376	#define sig_kernel_ignore(sig) \
377	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
378	#define sig_kernel_stop(sig) \
379	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
380
55c0d1f8 RM	381	#define sig_user_defined(t, signr) \
	382	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
	383	((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
	384
	385	#define sig_fatal(t, signr) \
	386	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	387	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	388
a1c9eea9 AB	389	void signals_init(void);
a1c9eea9 AB	390
1da177e4 LT	391	#endif /* __KERNEL__ */
	392
	393	#endif /* _LINUX_SIGNAL_H */