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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SIGNAL_H
#define _LINUX_SIGNAL_H

#include <linux/bug.h>
#include <linux/signal_types.h>
#include <linux/string.h>

struct task_struct;

/* for sysctl */
extern int print_fatal_signals;

static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
{
	if (from->si_code < 0)
		memcpy(to, from, sizeof(*to));
	else
		/* _sigchld is currently the largest know union member */
		memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
}

int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);

enum siginfo_layout {
	SIL_KILL,
	SIL_TIMER,
	SIL_POLL,
	SIL_FAULT,
	SIL_CHLD,
	SIL_RT,
#ifdef __ARCH_SIGSYS
	SIL_SYS,
#endif
};

enum siginfo_layout siginfo_layout(unsigned sig, int si_code);

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

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

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

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

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

#endif /* __HAVE_ARCH_SIG_BITOPS */

static inline int sigisemptyset(sigset_t *set)
{
	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:
		BUILD_BUG();
		return 0;
	}
}

static inline int sigequalsets(const sigset_t *set1, const sigset_t *set2)
{
	switch (_NSIG_WORDS) {
	case 4:
		return	(set1->sig[3] == set2->sig[3]) &&
			(set1->sig[2] == set2->sig[2]) &&
			(set1->sig[1] == set2->sig[1]) &&
			(set1->sig[0] == set2->sig[0]);
	case 2:
		return	(set1->sig[1] == set2->sig[1]) &&
			(set1->sig[0] == set2->sig[0]);
	case 1:
		return	set1->sig[0] == set2->sig[0];
	}
	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) \
{									\
	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:							\
		BUILD_BUG();						\
	}								\
}

#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)					\
{									\
	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:							\
		BUILD_BUG();						\
	}								\
}

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

#undef _SIG_SET_OP
#undef _sig_not

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

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

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

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

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

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

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

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

#endif /* __HAVE_ARCH_SIG_SETOPS */

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

extern void flush_sigqueue(struct sigpending *queue);

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

struct timespec;
struct pt_regs;

extern int next_signal(struct sigpending *pending, sigset_t *mask);
extern int do_send_sig_info(int sig, struct siginfo *info,
				struct task_struct *p, bool group);
extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
extern int 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 get_signal(struct ksignal *ksig);
extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
extern void exit_signals(struct task_struct *tsk);
extern void kernel_sigaction(int, __sighandler_t);

#define SIG_KTHREAD ((__force __sighandler_t)2)
#define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3)

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

static inline void allow_kernel_signal(int sig)
{
	/*
	 * Kernel threads handle their own signals. Let the signal code
	 * know signals sent by the kernel will be handled, so that they
	 * don't get silently dropped.
	 */
	kernel_sigaction(sig, SIG_KTHREAD_KERNEL);
}

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

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) \
	((sig) < SIGRTMIN && (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_SPECIFIC_SICODES_MASK (\
	rt_sigmask(SIGILL)    |  rt_sigmask(SIGFPE)    | \
	rt_sigmask(SIGSEGV)   |  rt_sigmask(SIGBUS)    | \
	rt_sigmask(SIGTRAP)   |  rt_sigmask(SIGCHLD)   | \
	rt_sigmask(SIGPOLL)   |  rt_sigmask(SIGSYS)    | \
	SIGEMT_MASK                                    )

#define sig_kernel_only(sig)		siginmask(sig, SIG_KERNEL_ONLY_MASK)
#define sig_kernel_coredump(sig)	siginmask(sig, SIG_KERNEL_COREDUMP_MASK)
#define sig_kernel_ignore(sig)		siginmask(sig, SIG_KERNEL_IGNORE_MASK)
#define sig_kernel_stop(sig)		siginmask(sig, SIG_KERNEL_STOP_MASK)
#define sig_specific_sicodes(sig)	siginmask(sig, SIG_SPECIFIC_SICODES_MASK)

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

void signals_init(void);

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

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

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

#endif /* _LINUX_SIGNAL_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_SIGNAL_H
	3	#define _LINUX_SIGNAL_H
	4
1c3bea0e	5	#include <linux/bug.h>
e6d930b4	6	#include <linux/signal_types.h>
7994200c	7	#include <linux/string.h>
1da177e4	8
1477fcc2 SR	9	struct task_struct;
1477fcc2 SR	10
d33ed52d DY	11	/* for sysctl */
d33ed52d DY	12	extern int print_fatal_signals;
1da177e4	13
ca9eb49a JH	14	static inline void copy_siginfo(struct siginfo to, struct siginfo from)
	15	{
	16	if (from->si_code < 0)
	17	memcpy(to, from, sizeof(*to));
	18	else
	19	/* _sigchld is currently the largest know union member */
	20	memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
	21	}
	22
b9253a43 CH	23	int copy_siginfo_to_user(struct siginfo __user to, const struct siginfo from);
b9253a43 CH	24
cc731525 EB	25	enum siginfo_layout {
	26	SIL_KILL,
	27	SIL_TIMER,
	28	SIL_POLL,
	29	SIL_FAULT,
	30	SIL_CHLD,
	31	SIL_RT,
	32	#ifdef __ARCH_SIGSYS
	33	SIL_SYS,
	34	#endif
	35	};
	36
9cbc4a39	37	enum siginfo_layout siginfo_layout(unsigned sig, int si_code);
cc731525	38
1da177e4 LT	39	/*
	40	* Define some primitives to manipulate sigset_t.
	41	*/
	42
	43	#ifndef __HAVE_ARCH_SIG_BITOPS
	44	#include <linux/bitops.h>
	45
	46	/* We don't use <linux/bitops.h> for these because there is no need to
	47	be atomic. */
	48	static inline void sigaddset(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 void sigdelset(sigset_t *set, int _sig)
	58	{
	59	unsigned long sig = _sig - 1;
	60	if (_NSIG_WORDS == 1)
	61	set->sig[0] &= ~(1UL << sig);
	62	else
	63	set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
	64	}
	65
	66	static inline int sigismember(sigset_t *set, int _sig)
	67	{
	68	unsigned long sig = _sig - 1;
	69	if (_NSIG_WORDS == 1)
	70	return 1 & (set->sig[0] >> sig);
	71	else
	72	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
	73	}
	74
1da177e4 LT	75	#endif /* __HAVE_ARCH_SIG_BITOPS */
1da177e4 LT	76
71fabd5e GA	77	static inline int sigisemptyset(sigset_t *set)
71fabd5e GA	78	{
71fabd5e GA	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:
1c3bea0e	88	BUILD_BUG();
71fabd5e GA	89	return 0;
	90	}
	91	}
	92
c7be96af WL	93	static inline int sigequalsets(const sigset_t set1, const sigset_t set2)
	94	{
	95	switch (_NSIG_WORDS) {
	96	case 4:
	97	return (set1->sig[3] == set2->sig[3]) &&
	98	(set1->sig[2] == set2->sig[2]) &&
	99	(set1->sig[1] == set2->sig[1]) &&
	100	(set1->sig[0] == set2->sig[0]);
	101	case 2:
	102	return (set1->sig[1] == set2->sig[1]) &&
	103	(set1->sig[0] == set2->sig[0]);
	104	case 1:
	105	return set1->sig[0] == set2->sig[0];
	106	}
	107	return 0;
	108	}
	109
1da177e4 LT	110	#define sigmask(sig) (1UL << ((sig) - 1))
	111
	112	#ifndef __HAVE_ARCH_SIG_SETOPS
	113	#include <linux/string.h>
	114
	115	#define _SIG_SET_BINOP(name, op) \
	116	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	117	{ \
1da177e4 LT	118	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	119	\
	120	switch (_NSIG_WORDS) { \
1c3bea0e	121	case 4: \
1da177e4 LT	122	a3 = a->sig[3]; a2 = a->sig[2]; \
	123	b3 = b->sig[3]; b2 = b->sig[2]; \
	124	r->sig[3] = op(a3, b3); \
	125	r->sig[2] = op(a2, b2); \
1c3bea0e	126	case 2: \
1da177e4 LT	127	a1 = a->sig[1]; b1 = b->sig[1]; \
1da177e4 LT	128	r->sig[1] = op(a1, b1); \
1c3bea0e	129	case 1: \
1da177e4 LT	130	a0 = a->sig[0]; b0 = b->sig[0]; \
	131	r->sig[0] = op(a0, b0); \
	132	break; \
1c3bea0e ON	133	default: \
1c3bea0e ON	134	BUILD_BUG(); \
1da177e4 LT	135	} \
	136	}
	137
	138	#define _sig_or(x,y) ((x) \| (y))
	139	_SIG_SET_BINOP(sigorsets, _sig_or)
	140
	141	#define _sig_and(x,y) ((x) & (y))
	142	_SIG_SET_BINOP(sigandsets, _sig_and)
	143
702a5073 ON	144	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	145	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	146
	147	#undef _SIG_SET_BINOP
	148	#undef _sig_or
	149	#undef _sig_and
702a5073	150	#undef _sig_andn
1da177e4 LT	151
	152	#define _SIG_SET_OP(name, op) \
	153	static inline void name(sigset_t *set) \
	154	{ \
1da177e4	155	switch (_NSIG_WORDS) { \
1c3bea0e ON	156	case 4: set->sig[3] = op(set->sig[3]); \
	157	set->sig[2] = op(set->sig[2]); \
	158	case 2: set->sig[1] = op(set->sig[1]); \
	159	case 1: set->sig[0] = op(set->sig[0]); \
1da177e4	160	break; \
1c3bea0e ON	161	default: \
1c3bea0e ON	162	BUILD_BUG(); \
1da177e4 LT	163	} \
	164	}
	165
	166	#define _sig_not(x) (~(x))
	167	_SIG_SET_OP(signotset, _sig_not)
	168
	169	#undef _SIG_SET_OP
	170	#undef _sig_not
	171
	172	static inline void sigemptyset(sigset_t *set)
	173	{
	174	switch (_NSIG_WORDS) {
	175	default:
	176	memset(set, 0, sizeof(sigset_t));
	177	break;
	178	case 2: set->sig[1] = 0;
	179	case 1: set->sig[0] = 0;
	180	break;
	181	}
	182	}
	183
	184	static inline void sigfillset(sigset_t *set)
	185	{
	186	switch (_NSIG_WORDS) {
	187	default:
	188	memset(set, -1, sizeof(sigset_t));
	189	break;
	190	case 2: set->sig[1] = -1;
	191	case 1: set->sig[0] = -1;
	192	break;
	193	}
	194	}
	195
	196	/* Some extensions for manipulating the low 32 signals in particular. */
	197
	198	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	199	{
	200	set->sig[0] \|= mask;
	201	}
	202
	203	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	204	{
	205	set->sig[0] &= ~mask;
	206	}
	207
	208	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	209	{
	210	return (set->sig[0] & mask) != 0;
	211	}
	212
	213	static inline void siginitset(sigset_t *set, unsigned long mask)
	214	{
	215	set->sig[0] = mask;
	216	switch (_NSIG_WORDS) {
	217	default:
	218	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
	219	break;
	220	case 2: set->sig[1] = 0;
	221	case 1: ;
	222	}
	223	}
	224
	225	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
	226	{
227	set->sig[0] = ~mask;
228	switch (_NSIG_WORDS) {
229	default:
230	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
231	break;
232	case 2: set->sig[1] = -1;
233	case 1: ;
234	}
235	}
236
237	#endif /* __HAVE_ARCH_SIG_SETOPS */
238
239	static inline void init_sigpending(struct sigpending *sig)
240	{
241	sigemptyset(&sig->signal);
242	INIT_LIST_HEAD(&sig->list);
243	}
244
6a14c5c9 ON	245	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	246
e5bdd883 JJ	247	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	248	static inline int valid_signal(unsigned long sig)
	249	{
	250	return sig <= _NSIG ? 1 : 0;
	251	}
	252
b2b07e4f ON	253	struct timespec;
	254	struct pt_regs;
	255
fba2afaa	256	extern int next_signal(struct sigpending pending, sigset_t mask);
4a30debf ON	257	extern int do_send_sig_info(int sig, struct siginfo *info,
4a30debf ON	258	struct task_struct *p, bool group);
1da177e4 LT	259	extern int group_send_sig_info(int sig, struct siginfo info, struct task_struct p);
1da177e4 LT	260	extern int __group_send_sig_info(int, struct siginfo , struct task_struct );
1da177e4	261	extern int sigprocmask(int, sigset_t , sigset_t );
77097ae5 AV	262	extern void set_current_blocked(sigset_t *);
77097ae5 AV	263	extern void __set_current_blocked(const sigset_t *);
abd4f750	264	extern int show_unhandled_signals;
1da177e4	265
828b1f65	266	extern int get_signal(struct ksignal *ksig);
2ce5da17	267	extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
d12619b5	268	extern void exit_signals(struct task_struct *tsk);
b4e74264 ON	269	extern void kernel_sigaction(int, __sighandler_t);
b4e74264 ON	270
6bd82415 EB	271	#define SIG_KTHREAD ((__force __sighandler_t)2)
	272	#define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3)
	273
b4e74264 ON	274	static inline void allow_signal(int sig)
	275	{
	276	/*
	277	* Kernel threads handle their own signals. Let the signal code
	278	* know it'll be handled, so that they don't get converted to
	279	* SIGKILL or just silently dropped.
	280	*/
6bd82415 EB	281	kernel_sigaction(sig, SIG_KTHREAD);
	282	}
	283
	284	static inline void allow_kernel_signal(int sig)
	285	{
	286	/*
	287	* Kernel threads handle their own signals. Let the signal code
	288	* know signals sent by the kernel will be handled, so that they
	289	* don't get silently dropped.
	290	*/
	291	kernel_sigaction(sig, SIG_KTHREAD_KERNEL);
b4e74264 ON	292	}
	293
	294	static inline void disallow_signal(int sig)
	295	{
	296	kernel_sigaction(sig, SIG_IGN);
	297	}
1da177e4	298
298ec1e2 CL	299	extern struct kmem_cache *sighand_cachep;
298ec1e2 CL	300
abd4f750 MAS	301	int unhandled_signal(struct task_struct *tsk, int sig);
abd4f750 MAS	302
55c0d1f8 RM	303	/*
	304	* In POSIX a signal is sent either to a specific thread (Linux task)
	305	* or to the process as a whole (Linux thread group). How the signal
	306	* is sent determines whether it's to one thread or the whole group,
	307	* which determines which signal mask(s) are involved in blocking it
	308	* from being delivered until later. When the signal is delivered,
	309	* either it's caught or ignored by a user handler or it has a default
	310	* effect that applies to the whole thread group (POSIX process).
	311	*
	312	* The possible effects an unblocked signal set to SIG_DFL can have are:
	313	* ignore - Nothing Happens
	314	* terminate - kill the process, i.e. all threads in the group,
	315	* similar to exit_group. The group leader (only) reports
	316	* WIFSIGNALED status to its parent.
	317	* coredump - write a core dump file describing all threads using
	318	* the same mm and then kill all those threads
	319	* stop - stop all the threads in the group, i.e. TASK_STOPPED state
	320	*
	321	* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
	322	* Other signals when not blocked and set to SIG_DFL behaves as follows.
	323	* The job control signals also have other special effects.
	324	*
	325	* +--------------------+------------------+
	326	* \| POSIX signal \| default action \|
	327	* +--------------------+------------------+
	328	* \| SIGHUP \| terminate \|
	329	* \| SIGINT \| terminate \|
	330	* \| SIGQUIT \| coredump \|
	331	* \| SIGILL \| coredump \|
	332	* \| SIGTRAP \| coredump \|
	333	* \| SIGABRT/SIGIOT \| coredump \|
	334	* \| SIGBUS \| coredump \|
	335	* \| SIGFPE \| coredump \|
	336	* \| SIGKILL \| terminate(+) \|
	337	* \| SIGUSR1 \| terminate \|
	338	* \| SIGSEGV \| coredump \|
	339	* \| SIGUSR2 \| terminate \|
	340	* \| SIGPIPE \| terminate \|
	341	* \| SIGALRM \| terminate \|
	342	* \| SIGTERM \| terminate \|
	343	* \| SIGCHLD \| ignore \|
	344	* \| SIGCONT \| ignore(*) \|
	345	* \| SIGSTOP \| stop(*)(+) \|
	346	* \| SIGTSTP \| stop(*) \|
	347	* \| SIGTTIN \| stop(*) \|
	348	* \| SIGTTOU \| stop(*) \|
	349	* \| SIGURG \| ignore \|
	350	* \| SIGXCPU \| coredump \|
	351	* \| SIGXFSZ \| coredump \|
	352	* \| SIGVTALRM \| terminate \|
	353	* \| SIGPROF \| terminate \|
	354	* \| SIGPOLL/SIGIO \| terminate \|
	355	* \| SIGSYS/SIGUNUSED \| coredump \|
	356	* \| SIGSTKFLT \| terminate \|
	357	* \| SIGWINCH \| ignore \|
	358	* \| SIGPWR \| terminate \|
	359	* \| SIGRTMIN-SIGRTMAX \| terminate \|
	360	* +--------------------+------------------+
	361	* \| non-POSIX signal \| default action \|
	362	* +--------------------+------------------+
	363	* \| SIGEMT \| coredump \|
	364	* +--------------------+------------------+
	365	*
	366	* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
367	* (*) Special job control effects:
368	* When SIGCONT is sent, it resumes the process (all threads in the group)
369	* from TASK_STOPPED state and also clears any pending/queued stop signals
370	* (any of those marked with "stop(*)"). This happens regardless of blocking,
371	* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
372	* any pending/queued SIGCONT signals; this happens regardless of blocking,
373	* catching, or ignored the stop signal, though (except for SIGSTOP) the
374	* default action of stopping the process may happen later or never.
375	*/
376
377	#ifdef SIGEMT
378	#define SIGEMT_MASK rt_sigmask(SIGEMT)
379	#else
380	#define SIGEMT_MASK 0
381	#endif
382
383	#if SIGRTMIN > BITS_PER_LONG
384	#define rt_sigmask(sig) (1ULL << ((sig)-1))
385	#else
386	#define rt_sigmask(sig) sigmask(sig)
387	#endif
5c8ccefd ON	388
	389	#define siginmask(sig, mask) \
	390	((sig) < SIGRTMIN && (rt_sigmask(sig) & (mask)))
55c0d1f8 RM	391
	392	#define SIG_KERNEL_ONLY_MASK (\
	393	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
	394
	395	#define SIG_KERNEL_STOP_MASK (\
	396	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
	397	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
	398
	399	#define SIG_KERNEL_COREDUMP_MASK (\
	400	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
	401	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
	402	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
	403	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
	404	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
	405	SIGEMT_MASK )
	406
	407	#define SIG_KERNEL_IGNORE_MASK (\
	408	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
	409	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
	410
d08477aa EB	411	#define SIG_SPECIFIC_SICODES_MASK (\
	412	rt_sigmask(SIGILL) \| rt_sigmask(SIGFPE) \| \
	413	rt_sigmask(SIGSEGV) \| rt_sigmask(SIGBUS) \| \
	414	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGCHLD) \| \
	415	rt_sigmask(SIGPOLL) \| rt_sigmask(SIGSYS) \| \
	416	SIGEMT_MASK )
	417
5c8ccefd ON	418	#define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK)
	419	#define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK)
	420	#define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK)
	421	#define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK)
d08477aa	422	#define sig_specific_sicodes(sig) siginmask(sig, SIG_SPECIFIC_SICODES_MASK)
55c0d1f8	423
55c0d1f8 RM	424	#define sig_fatal(t, signr) \
	425	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	426	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	427
a1c9eea9 AB	428	void signals_init(void);
a1c9eea9 AB	429
5c49574f	430	int restore_altstack(const stack_t __user *);
c40702c4	431	int __save_altstack(stack_t __user *, unsigned long);
5c49574f	432
bd1c149a AV	433	#define save_altstack_ex(uss, sp) do { \
	434	stack_t __user *__uss = uss; \
	435	struct task_struct *t = current; \
	436	put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
2a742138	437	put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
bd1c149a	438	put_user_ex(t->sas_ss_size, &__uss->ss_size); \
2a742138 SS	439	if (t->sas_ss_flags & SS_AUTODISARM) \
2a742138 SS	440	sas_ss_reset(t); \
bd1c149a AV	441	} while (0);
bd1c149a AV	442
34db8aaf DH	443	#ifdef CONFIG_PROC_FS
	444	struct seq_file;
	445	extern void render_sigset_t(struct seq_file , const char , sigset_t *);
	446	#endif
	447
1da177e4	448	#endif /* _LINUX_SIGNAL_H */