[linux-block.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>

/*
 * 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_nand(x,y)	((x) & ~(y))
_SIG_SET_BINOP(signandsets, _sig_nand)

#undef _SIG_SET_BINOP
#undef _sig_or
#undef _sig_and
#undef _sig_nand

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