[mirror_ubuntu-artful-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));
}

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 signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping);
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 /* _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
	66	static inline int sigfindinword(unsigned long word)
	67	{
	68	return ffz(~word);
	69	}
	70
	71	#endif /* __HAVE_ARCH_SIG_BITOPS */
	72
71fabd5e GA	73	static inline int sigisemptyset(sigset_t *set)
	74	{
	75	extern void _NSIG_WORDS_is_unsupported_size(void);
	76	switch (_NSIG_WORDS) {
	77	case 4:
	78	return (set->sig[3] \| set->sig[2] \|
	79	set->sig[1] \| set->sig[0]) == 0;
	80	case 2:
	81	return (set->sig[1] \| set->sig[0]) == 0;
	82	case 1:
	83	return set->sig[0] == 0;
	84	default:
	85	_NSIG_WORDS_is_unsupported_size();
	86	return 0;
	87	}
	88	}
	89
1da177e4 LT	90	#define sigmask(sig) (1UL << ((sig) - 1))
	91
	92	#ifndef __HAVE_ARCH_SIG_SETOPS
	93	#include <linux/string.h>
	94
	95	#define _SIG_SET_BINOP(name, op) \
	96	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	97	{ \
	98	extern void _NSIG_WORDS_is_unsupported_size(void); \
	99	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	100	\
	101	switch (_NSIG_WORDS) { \
	102	case 4: \
	103	a3 = a->sig[3]; a2 = a->sig[2]; \
	104	b3 = b->sig[3]; b2 = b->sig[2]; \
	105	r->sig[3] = op(a3, b3); \
	106	r->sig[2] = op(a2, b2); \
	107	case 2: \
	108	a1 = a->sig[1]; b1 = b->sig[1]; \
	109	r->sig[1] = op(a1, b1); \
	110	case 1: \
	111	a0 = a->sig[0]; b0 = b->sig[0]; \
	112	r->sig[0] = op(a0, b0); \
	113	break; \
	114	default: \
	115	_NSIG_WORDS_is_unsupported_size(); \
	116	} \
	117	}
	118
	119	#define _sig_or(x,y) ((x) \| (y))
	120	_SIG_SET_BINOP(sigorsets, _sig_or)
	121
	122	#define _sig_and(x,y) ((x) & (y))
	123	_SIG_SET_BINOP(sigandsets, _sig_and)
	124
702a5073 ON	125	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	126	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	127
	128	#undef _SIG_SET_BINOP
	129	#undef _sig_or
	130	#undef _sig_and
702a5073	131	#undef _sig_andn
1da177e4 LT	132
	133	#define _SIG_SET_OP(name, op) \
	134	static inline void name(sigset_t *set) \
	135	{ \
	136	extern void _NSIG_WORDS_is_unsupported_size(void); \
	137	\
	138	switch (_NSIG_WORDS) { \
	139	case 4: set->sig[3] = op(set->sig[3]); \
	140	set->sig[2] = op(set->sig[2]); \
	141	case 2: set->sig[1] = op(set->sig[1]); \
	142	case 1: set->sig[0] = op(set->sig[0]); \
	143	break; \
	144	default: \
	145	_NSIG_WORDS_is_unsupported_size(); \
	146	} \
	147	}
	148
	149	#define _sig_not(x) (~(x))
	150	_SIG_SET_OP(signotset, _sig_not)
	151
	152	#undef _SIG_SET_OP
	153	#undef _sig_not
	154
	155	static inline void sigemptyset(sigset_t *set)
	156	{
	157	switch (_NSIG_WORDS) {
	158	default:
	159	memset(set, 0, sizeof(sigset_t));
	160	break;
	161	case 2: set->sig[1] = 0;
	162	case 1: set->sig[0] = 0;
	163	break;
	164	}
	165	}
	166
	167	static inline void sigfillset(sigset_t *set)
	168	{
	169	switch (_NSIG_WORDS) {
	170	default:
	171	memset(set, -1, sizeof(sigset_t));
	172	break;
	173	case 2: set->sig[1] = -1;
	174	case 1: set->sig[0] = -1;
	175	break;
	176	}
	177	}
	178
	179	/* Some extensions for manipulating the low 32 signals in particular. */
	180
	181	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	182	{
	183	set->sig[0] \|= mask;
	184	}
	185
	186	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	187	{
	188	set->sig[0] &= ~mask;
	189	}
	190
	191	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	192	{
	193	return (set->sig[0] & mask) != 0;
	194	}
	195
196	static inline void siginitset(sigset_t *set, unsigned long mask)
197	{
198	set->sig[0] = mask;
199	switch (_NSIG_WORDS) {
200	default:
201	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
202	break;
203	case 2: set->sig[1] = 0;
204	case 1: ;
205	}
206	}
207
208	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
209	{
210	set->sig[0] = ~mask;
211	switch (_NSIG_WORDS) {
212	default:
213	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
214	break;
215	case 2: set->sig[1] = -1;
216	case 1: ;
217	}
218	}
219
220	#endif /* __HAVE_ARCH_SIG_SETOPS */
221
222	static inline void init_sigpending(struct sigpending *sig)
223	{
224	sigemptyset(&sig->signal);
225	INIT_LIST_HEAD(&sig->list);
226	}
227
6a14c5c9 ON	228	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	229
e5bdd883 JJ	230	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	231	static inline int valid_signal(unsigned long sig)
	232	{
	233	return sig <= _NSIG ? 1 : 0;
	234	}
	235
b2b07e4f ON	236	struct timespec;
	237	struct pt_regs;
	238
fba2afaa	239	extern int next_signal(struct sigpending pending, sigset_t mask);
4a30debf ON	240	extern int do_send_sig_info(int sig, struct siginfo *info,
4a30debf ON	241	struct task_struct *p, bool group);
1da177e4 LT	242	extern int group_send_sig_info(int sig, struct siginfo info, struct task_struct p);
1da177e4 LT	243	extern int __group_send_sig_info(int, struct siginfo , struct task_struct );
62ab4505 TG	244	extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
62ab4505 TG	245	siginfo_t *info);
1da177e4	246	extern long do_sigpending(void __user *, unsigned long);
943df148 ON	247	extern int do_sigtimedwait(const sigset_t , siginfo_t ,
943df148 ON	248	const struct timespec *);
1da177e4	249	extern int sigprocmask(int, sigset_t , sigset_t );
77097ae5 AV	250	extern void set_current_blocked(sigset_t *);
77097ae5 AV	251	extern void __set_current_blocked(const sigset_t *);
abd4f750	252	extern int show_unhandled_signals;
68f3f16d	253	extern int sigsuspend(sigset_t *);
1da177e4	254
1da177e4	255	extern int get_signal_to_deliver(siginfo_t info, struct k_sigaction return_ka, struct pt_regs regs, void cookie);
efee984c	256	extern void signal_delivered(int sig, siginfo_t info, struct k_sigaction ka, struct pt_regs *regs, int stepping);
d12619b5	257	extern void exit_signals(struct task_struct *tsk);
1da177e4	258
298ec1e2 CL	259	extern struct kmem_cache *sighand_cachep;
298ec1e2 CL	260
abd4f750 MAS	261	int unhandled_signal(struct task_struct *tsk, int sig);
abd4f750 MAS	262
55c0d1f8 RM	263	/*
	264	* In POSIX a signal is sent either to a specific thread (Linux task)
	265	* or to the process as a whole (Linux thread group). How the signal
	266	* is sent determines whether it's to one thread or the whole group,
	267	* which determines which signal mask(s) are involved in blocking it
	268	* from being delivered until later. When the signal is delivered,
	269	* either it's caught or ignored by a user handler or it has a default
	270	* effect that applies to the whole thread group (POSIX process).
	271	*
	272	* The possible effects an unblocked signal set to SIG_DFL can have are:
	273	* ignore - Nothing Happens
	274	* terminate - kill the process, i.e. all threads in the group,
	275	* similar to exit_group. The group leader (only) reports
	276	* WIFSIGNALED status to its parent.
	277	* coredump - write a core dump file describing all threads using
	278	* the same mm and then kill all those threads
	279	* stop - stop all the threads in the group, i.e. TASK_STOPPED state
	280	*
	281	* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
	282	* Other signals when not blocked and set to SIG_DFL behaves as follows.
	283	* The job control signals also have other special effects.
	284	*
	285	* +--------------------+------------------+
	286	* \| POSIX signal \| default action \|
	287	* +--------------------+------------------+
	288	* \| SIGHUP \| terminate \|
	289	* \| SIGINT \| terminate \|
	290	* \| SIGQUIT \| coredump \|
	291	* \| SIGILL \| coredump \|
	292	* \| SIGTRAP \| coredump \|
	293	* \| SIGABRT/SIGIOT \| coredump \|
	294	* \| SIGBUS \| coredump \|
	295	* \| SIGFPE \| coredump \|
	296	* \| SIGKILL \| terminate(+) \|
	297	* \| SIGUSR1 \| terminate \|
	298	* \| SIGSEGV \| coredump \|
	299	* \| SIGUSR2 \| terminate \|
	300	* \| SIGPIPE \| terminate \|
	301	* \| SIGALRM \| terminate \|
	302	* \| SIGTERM \| terminate \|
	303	* \| SIGCHLD \| ignore \|
	304	* \| SIGCONT \| ignore(*) \|
	305	* \| SIGSTOP \| stop(*)(+) \|
	306	* \| SIGTSTP \| stop(*) \|
	307	* \| SIGTTIN \| stop(*) \|
	308	* \| SIGTTOU \| stop(*) \|
	309	* \| SIGURG \| ignore \|
	310	* \| SIGXCPU \| coredump \|
	311	* \| SIGXFSZ \| coredump \|
	312	* \| SIGVTALRM \| terminate \|
	313	* \| SIGPROF \| terminate \|
	314	* \| SIGPOLL/SIGIO \| terminate \|
	315	* \| SIGSYS/SIGUNUSED \| coredump \|
	316	* \| SIGSTKFLT \| terminate \|
	317	* \| SIGWINCH \| ignore \|
	318	* \| SIGPWR \| terminate \|
	319	* \| SIGRTMIN-SIGRTMAX \| terminate \|
	320	* +--------------------+------------------+
	321	* \| non-POSIX signal \| default action \|
	322	* +--------------------+------------------+
	323	* \| SIGEMT \| coredump \|
	324	* +--------------------+------------------+
	325	*
	326	* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
327	* (*) Special job control effects:
328	* When SIGCONT is sent, it resumes the process (all threads in the group)
329	* from TASK_STOPPED state and also clears any pending/queued stop signals
330	* (any of those marked with "stop(*)"). This happens regardless of blocking,
331	* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
332	* any pending/queued SIGCONT signals; this happens regardless of blocking,
333	* catching, or ignored the stop signal, though (except for SIGSTOP) the
334	* default action of stopping the process may happen later or never.
335	*/
336
337	#ifdef SIGEMT
338	#define SIGEMT_MASK rt_sigmask(SIGEMT)
339	#else
340	#define SIGEMT_MASK 0
341	#endif
342
343	#if SIGRTMIN > BITS_PER_LONG
344	#define rt_sigmask(sig) (1ULL << ((sig)-1))
345	#else
346	#define rt_sigmask(sig) sigmask(sig)
347	#endif
348	#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
349
350	#define SIG_KERNEL_ONLY_MASK (\
351	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
352
353	#define SIG_KERNEL_STOP_MASK (\
354	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
355	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
356
357	#define SIG_KERNEL_COREDUMP_MASK (\
358	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
359	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
360	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
361	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
362	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
363	SIGEMT_MASK )
364
365	#define SIG_KERNEL_IGNORE_MASK (\
366	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
367	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
368
369	#define sig_kernel_only(sig) \
370	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
371	#define sig_kernel_coredump(sig) \
372	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
373	#define sig_kernel_ignore(sig) \
374	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
375	#define sig_kernel_stop(sig) \
376	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
377
55c0d1f8 RM	378	#define sig_user_defined(t, signr) \
	379	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
	380	((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
	381
	382	#define sig_fatal(t, signr) \
	383	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	384	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	385
a1c9eea9 AB	386	void signals_init(void);
a1c9eea9 AB	387
1da177e4	388	#endif /* _LINUX_SIGNAL_H */