[mirror_ubuntu-eoan-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(kernel_siginfo_t *to,
				const kernel_siginfo_t *from)
{
	memcpy(to, from, sizeof(*to));
}

static inline void clear_siginfo(kernel_siginfo_t *info)
{
	memset(info, 0, sizeof(*info));
}

#define SI_EXPANSION_SIZE (sizeof(struct siginfo) - sizeof(struct kernel_siginfo))

int copy_siginfo_to_user(siginfo_t __user *to, const kernel_siginfo_t *from);
int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from);

enum siginfo_layout {
	SIL_KILL,
	SIL_TIMER,
	SIL_POLL,
	SIL_FAULT,
	SIL_FAULT_MCEERR,
	SIL_FAULT_BNDERR,
	SIL_FAULT_PKUERR,
	SIL_CHLD,
	SIL_RT,
	SIL_SYS,
};

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);					\
		/* fall through */					\
	case 2:								\
		a1 = a->sig[1]; b1 = b->sig[1];				\
		r->sig[1] = op(a1, b1);					\
		/* fall through */					\
	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]);				\
		/* fall through */					\
	case 2:	set->sig[1] = op(set->sig[1]);				\
		/* fall through */					\
	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;
		/* fall through */
	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;
		/* fall through */
	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;
enum pid_type;

extern int next_signal(struct sigpending *pending, sigset_t *mask);
extern int do_send_sig_info(int sig, struct kernel_siginfo *info,
				struct task_struct *p, enum pid_type type);
extern int group_send_sig_info(int sig, struct kernel_siginfo *info,
			       struct task_struct *p, enum pid_type type);
extern int __group_send_sig_info(int, struct kernel_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 bool 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);

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, (__force __sighandler_t)2);
}

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

extern struct kmem_cache *sighand_cachep;

extern bool 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
ae7795bc EB	14	static inline void copy_siginfo(kernel_siginfo_t *to,
ae7795bc EB	15	const kernel_siginfo_t *from)
ca9eb49a	16	{
8c36fdf5	17	memcpy(to, from, sizeof(*to));
ca9eb49a JH	18	}
ca9eb49a JH	19
ae7795bc	20	static inline void clear_siginfo(kernel_siginfo_t *info)
8c5dbf2a EB	21	{
	22	memset(info, 0, sizeof(*info));
	23	}
	24
4ce5f9c9 EB	25	#define SI_EXPANSION_SIZE (sizeof(struct siginfo) - sizeof(struct kernel_siginfo))
4ce5f9c9 EB	26
ae7795bc EB	27	int copy_siginfo_to_user(siginfo_t __user to, const kernel_siginfo_t from);
ae7795bc EB	28	int copy_siginfo_from_user(kernel_siginfo_t to, const siginfo_t __user from);
b9253a43	29
cc731525 EB	30	enum siginfo_layout {
	31	SIL_KILL,
	32	SIL_TIMER,
	33	SIL_POLL,
	34	SIL_FAULT,
31931c93 EB	35	SIL_FAULT_MCEERR,
	36	SIL_FAULT_BNDERR,
	37	SIL_FAULT_PKUERR,
cc731525 EB	38	SIL_CHLD,
cc731525 EB	39	SIL_RT,
cc731525	40	SIL_SYS,
cc731525 EB	41	};
cc731525 EB	42
a3670058	43	enum siginfo_layout siginfo_layout(unsigned sig, int si_code);
cc731525	44
1da177e4 LT	45	/*
	46	* Define some primitives to manipulate sigset_t.
	47	*/
	48
	49	#ifndef __HAVE_ARCH_SIG_BITOPS
	50	#include <linux/bitops.h>
	51
	52	/* We don't use <linux/bitops.h> for these because there is no need to
	53	be atomic. */
	54	static inline void sigaddset(sigset_t *set, int _sig)
	55	{
	56	unsigned long sig = _sig - 1;
	57	if (_NSIG_WORDS == 1)
	58	set->sig[0] \|= 1UL << sig;
	59	else
	60	set->sig[sig / _NSIG_BPW] \|= 1UL << (sig % _NSIG_BPW);
	61	}
	62
	63	static inline void sigdelset(sigset_t *set, int _sig)
	64	{
	65	unsigned long sig = _sig - 1;
	66	if (_NSIG_WORDS == 1)
	67	set->sig[0] &= ~(1UL << sig);
	68	else
	69	set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
	70	}
	71
	72	static inline int sigismember(sigset_t *set, int _sig)
	73	{
	74	unsigned long sig = _sig - 1;
	75	if (_NSIG_WORDS == 1)
	76	return 1 & (set->sig[0] >> sig);
	77	else
	78	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
	79	}
	80
1da177e4 LT	81	#endif /* __HAVE_ARCH_SIG_BITOPS */
1da177e4 LT	82
71fabd5e GA	83	static inline int sigisemptyset(sigset_t *set)
71fabd5e GA	84	{
71fabd5e GA	85	switch (_NSIG_WORDS) {
	86	case 4:
	87	return (set->sig[3] \| set->sig[2] \|
	88	set->sig[1] \| set->sig[0]) == 0;
	89	case 2:
	90	return (set->sig[1] \| set->sig[0]) == 0;
	91	case 1:
	92	return set->sig[0] == 0;
	93	default:
1c3bea0e	94	BUILD_BUG();
71fabd5e GA	95	return 0;
	96	}
	97	}
	98
c7be96af WL	99	static inline int sigequalsets(const sigset_t set1, const sigset_t set2)
	100	{
	101	switch (_NSIG_WORDS) {
	102	case 4:
	103	return (set1->sig[3] == set2->sig[3]) &&
	104	(set1->sig[2] == set2->sig[2]) &&
	105	(set1->sig[1] == set2->sig[1]) &&
	106	(set1->sig[0] == set2->sig[0]);
	107	case 2:
	108	return (set1->sig[1] == set2->sig[1]) &&
	109	(set1->sig[0] == set2->sig[0]);
	110	case 1:
	111	return set1->sig[0] == set2->sig[0];
	112	}
	113	return 0;
	114	}
	115
1da177e4 LT	116	#define sigmask(sig) (1UL << ((sig) - 1))
	117
	118	#ifndef __HAVE_ARCH_SIG_SETOPS
	119	#include <linux/string.h>
	120
	121	#define _SIG_SET_BINOP(name, op) \
	122	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	123	{ \
1da177e4 LT	124	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	125	\
	126	switch (_NSIG_WORDS) { \
1c3bea0e	127	case 4: \
1da177e4 LT	128	a3 = a->sig[3]; a2 = a->sig[2]; \
	129	b3 = b->sig[3]; b2 = b->sig[2]; \
	130	r->sig[3] = op(a3, b3); \
	131	r->sig[2] = op(a2, b2); \
3819ddec	132	/* fall through */ \
1c3bea0e	133	case 2: \
1da177e4 LT	134	a1 = a->sig[1]; b1 = b->sig[1]; \
1da177e4 LT	135	r->sig[1] = op(a1, b1); \
3819ddec	136	/* fall through */ \
1c3bea0e	137	case 1: \
1da177e4 LT	138	a0 = a->sig[0]; b0 = b->sig[0]; \
	139	r->sig[0] = op(a0, b0); \
	140	break; \
1c3bea0e ON	141	default: \
1c3bea0e ON	142	BUILD_BUG(); \
1da177e4 LT	143	} \
	144	}
	145
	146	#define _sig_or(x,y) ((x) \| (y))
	147	_SIG_SET_BINOP(sigorsets, _sig_or)
	148
	149	#define _sig_and(x,y) ((x) & (y))
	150	_SIG_SET_BINOP(sigandsets, _sig_and)
	151
702a5073 ON	152	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	153	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	154
	155	#undef _SIG_SET_BINOP
	156	#undef _sig_or
	157	#undef _sig_and
702a5073	158	#undef _sig_andn
1da177e4 LT	159
	160	#define _SIG_SET_OP(name, op) \
	161	static inline void name(sigset_t *set) \
	162	{ \
1da177e4	163	switch (_NSIG_WORDS) { \
1c3bea0e ON	164	case 4: set->sig[3] = op(set->sig[3]); \
1c3bea0e ON	165	set->sig[2] = op(set->sig[2]); \
3819ddec	166	/* fall through */ \
1c3bea0e	167	case 2: set->sig[1] = op(set->sig[1]); \
3819ddec	168	/* fall through */ \
1c3bea0e	169	case 1: set->sig[0] = op(set->sig[0]); \
1da177e4	170	break; \
1c3bea0e ON	171	default: \
1c3bea0e ON	172	BUILD_BUG(); \
1da177e4 LT	173	} \
	174	}
	175
	176	#define _sig_not(x) (~(x))
	177	_SIG_SET_OP(signotset, _sig_not)
	178
	179	#undef _SIG_SET_OP
	180	#undef _sig_not
	181
	182	static inline void sigemptyset(sigset_t *set)
	183	{
	184	switch (_NSIG_WORDS) {
	185	default:
	186	memset(set, 0, sizeof(sigset_t));
	187	break;
	188	case 2: set->sig[1] = 0;
3819ddec	189	/* fall through */
1da177e4 LT	190	case 1: set->sig[0] = 0;
	191	break;
	192	}
	193	}
	194
	195	static inline void sigfillset(sigset_t *set)
	196	{
	197	switch (_NSIG_WORDS) {
	198	default:
	199	memset(set, -1, sizeof(sigset_t));
	200	break;
	201	case 2: set->sig[1] = -1;
3819ddec	202	/* fall through */
1da177e4 LT	203	case 1: set->sig[0] = -1;
	204	break;
	205	}
	206	}
	207
	208	/* Some extensions for manipulating the low 32 signals in particular. */
	209
	210	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	211	{
	212	set->sig[0] \|= mask;
	213	}
	214
	215	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	216	{
	217	set->sig[0] &= ~mask;
	218	}
	219
	220	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	221	{
	222	return (set->sig[0] & mask) != 0;
	223	}
	224
	225	static inline void siginitset(sigset_t *set, unsigned long mask)
	226	{
	227	set->sig[0] = mask;
	228	switch (_NSIG_WORDS) {
	229	default:
	230	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
	231	break;
	232	case 2: set->sig[1] = 0;
	233	case 1: ;
	234	}
	235	}
	236
	237	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
	238	{
	239	set->sig[0] = ~mask;
	240	switch (_NSIG_WORDS) {
	241	default:
	242	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
	243	break;
	244	case 2: set->sig[1] = -1;
	245	case 1: ;
	246	}
	247	}
	248
	249	#endif /* __HAVE_ARCH_SIG_SETOPS */
	250
	251	static inline void init_sigpending(struct sigpending *sig)
	252	{
	253	sigemptyset(&sig->signal);
	254	INIT_LIST_HEAD(&sig->list);
	255	}
	256
6a14c5c9 ON	257	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	258
e5bdd883 JJ	259	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	260	static inline int valid_signal(unsigned long sig)
	261	{
	262	return sig <= _NSIG ? 1 : 0;
	263	}
	264
b2b07e4f ON	265	struct timespec;
b2b07e4f ON	266	struct pt_regs;
01024980	267	enum pid_type;
b2b07e4f	268
fba2afaa	269	extern int next_signal(struct sigpending pending, sigset_t mask);
ae7795bc	270	extern int do_send_sig_info(int sig, struct kernel_siginfo *info,
40b3b025	271	struct task_struct *p, enum pid_type type);
ae7795bc	272	extern int group_send_sig_info(int sig, struct kernel_siginfo *info,
01024980	273	struct task_struct *p, enum pid_type type);
ae7795bc	274	extern int __group_send_sig_info(int, struct kernel_siginfo , struct task_struct );
1da177e4	275	extern int sigprocmask(int, sigset_t , sigset_t );
77097ae5 AV	276	extern void set_current_blocked(sigset_t *);
77097ae5 AV	277	extern void __set_current_blocked(const sigset_t *);
abd4f750	278	extern int show_unhandled_signals;
1da177e4	279
20ab7218	280	extern bool get_signal(struct ksignal *ksig);
2ce5da17	281	extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
d12619b5	282	extern void exit_signals(struct task_struct *tsk);
b4e74264 ON	283	extern void kernel_sigaction(int, __sighandler_t);
	284
	285	static inline void allow_signal(int sig)
	286	{
	287	/*
	288	* Kernel threads handle their own signals. Let the signal code
	289	* know it'll be handled, so that they don't get converted to
	290	* SIGKILL or just silently dropped.
	291	*/
	292	kernel_sigaction(sig, (__force __sighandler_t)2);
	293	}
	294
	295	static inline void disallow_signal(int sig)
	296	{
	297	kernel_sigaction(sig, SIG_IGN);
	298	}
1da177e4	299
298ec1e2 CL	300	extern struct kmem_cache *sighand_cachep;
298ec1e2 CL	301
67a48a24	302	extern bool unhandled_signal(struct task_struct *tsk, int sig);
abd4f750	303
55c0d1f8 RM	304	/*
	305	* In POSIX a signal is sent either to a specific thread (Linux task)
	306	* or to the process as a whole (Linux thread group). How the signal
	307	* is sent determines whether it's to one thread or the whole group,
	308	* which determines which signal mask(s) are involved in blocking it
	309	* from being delivered until later. When the signal is delivered,
	310	* either it's caught or ignored by a user handler or it has a default
	311	* effect that applies to the whole thread group (POSIX process).
	312	*
	313	* The possible effects an unblocked signal set to SIG_DFL can have are:
	314	* ignore - Nothing Happens
	315	* terminate - kill the process, i.e. all threads in the group,
	316	* similar to exit_group. The group leader (only) reports
	317	* WIFSIGNALED status to its parent.
	318	* coredump - write a core dump file describing all threads using
	319	* the same mm and then kill all those threads
	320	* stop - stop all the threads in the group, i.e. TASK_STOPPED state
	321	*
	322	* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
	323	* Other signals when not blocked and set to SIG_DFL behaves as follows.
	324	* The job control signals also have other special effects.
	325	*
	326	* +--------------------+------------------+
	327	* \| POSIX signal \| default action \|
	328	* +--------------------+------------------+
	329	* \| SIGHUP \| terminate \|
	330	* \| SIGINT \| terminate \|
	331	* \| SIGQUIT \| coredump \|
	332	* \| SIGILL \| coredump \|
	333	* \| SIGTRAP \| coredump \|
	334	* \| SIGABRT/SIGIOT \| coredump \|
	335	* \| SIGBUS \| coredump \|
	336	* \| SIGFPE \| coredump \|
	337	* \| SIGKILL \| terminate(+) \|
	338	* \| SIGUSR1 \| terminate \|
	339	* \| SIGSEGV \| coredump \|
	340	* \| SIGUSR2 \| terminate \|
	341	* \| SIGPIPE \| terminate \|
	342	* \| SIGALRM \| terminate \|
	343	* \| SIGTERM \| terminate \|
	344	* \| SIGCHLD \| ignore \|
	345	* \| SIGCONT \| ignore(*) \|
	346	* \| SIGSTOP \| stop(*)(+) \|
	347	* \| SIGTSTP \| stop(*) \|
	348	* \| SIGTTIN \| stop(*) \|
	349	* \| SIGTTOU \| stop(*) \|
	350	* \| SIGURG \| ignore \|
	351	* \| SIGXCPU \| coredump \|
	352	* \| SIGXFSZ \| coredump \|
	353	* \| SIGVTALRM \| terminate \|
	354	* \| SIGPROF \| terminate \|
	355	* \| SIGPOLL/SIGIO \| terminate \|
	356	* \| SIGSYS/SIGUNUSED \| coredump \|
	357	* \| SIGSTKFLT \| terminate \|
	358	* \| SIGWINCH \| ignore \|
	359	* \| SIGPWR \| terminate \|
	360	* \| SIGRTMIN-SIGRTMAX \| terminate \|
	361	* +--------------------+------------------+
	362	* \| non-POSIX signal \| default action \|
	363	* +--------------------+------------------+
	364	* \| SIGEMT \| coredump \|
	365	* +--------------------+------------------+
	366	*
	367	* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
368	* (*) Special job control effects:
369	* When SIGCONT is sent, it resumes the process (all threads in the group)
370	* from TASK_STOPPED state and also clears any pending/queued stop signals
371	* (any of those marked with "stop(*)"). This happens regardless of blocking,
372	* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
373	* any pending/queued SIGCONT signals; this happens regardless of blocking,
374	* catching, or ignored the stop signal, though (except for SIGSTOP) the
375	* default action of stopping the process may happen later or never.
376	*/
377
378	#ifdef SIGEMT
379	#define SIGEMT_MASK rt_sigmask(SIGEMT)
380	#else
381	#define SIGEMT_MASK 0
382	#endif
383
384	#if SIGRTMIN > BITS_PER_LONG
385	#define rt_sigmask(sig) (1ULL << ((sig)-1))
386	#else
387	#define rt_sigmask(sig) sigmask(sig)
388	#endif
5c8ccefd ON	389
	390	#define siginmask(sig, mask) \
	391	((sig) < SIGRTMIN && (rt_sigmask(sig) & (mask)))
55c0d1f8 RM	392
	393	#define SIG_KERNEL_ONLY_MASK (\
	394	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
	395
	396	#define SIG_KERNEL_STOP_MASK (\
	397	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
	398	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
	399
	400	#define SIG_KERNEL_COREDUMP_MASK (\
	401	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
	402	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
	403	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
	404	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
	405	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
	406	SIGEMT_MASK )
	407
	408	#define SIG_KERNEL_IGNORE_MASK (\
	409	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
	410	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
	411
d08477aa EB	412	#define SIG_SPECIFIC_SICODES_MASK (\
	413	rt_sigmask(SIGILL) \| rt_sigmask(SIGFPE) \| \
	414	rt_sigmask(SIGSEGV) \| rt_sigmask(SIGBUS) \| \
	415	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGCHLD) \| \
	416	rt_sigmask(SIGPOLL) \| rt_sigmask(SIGSYS) \| \
	417	SIGEMT_MASK )
	418
5c8ccefd ON	419	#define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK)
	420	#define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK)
	421	#define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK)
	422	#define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK)
d08477aa	423	#define sig_specific_sicodes(sig) siginmask(sig, SIG_SPECIFIC_SICODES_MASK)
55c0d1f8	424
55c0d1f8 RM	425	#define sig_fatal(t, signr) \
	426	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	427	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	428
a1c9eea9 AB	429	void signals_init(void);
a1c9eea9 AB	430
5c49574f	431	int restore_altstack(const stack_t __user *);
c40702c4	432	int __save_altstack(stack_t __user *, unsigned long);
5c49574f	433
bd1c149a AV	434	#define save_altstack_ex(uss, sp) do { \
	435	stack_t __user *__uss = uss; \
	436	struct task_struct *t = current; \
	437	put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
2a742138	438	put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
bd1c149a	439	put_user_ex(t->sas_ss_size, &__uss->ss_size); \
2a742138 SS	440	if (t->sas_ss_flags & SS_AUTODISARM) \
2a742138 SS	441	sas_ss_reset(t); \
bd1c149a AV	442	} while (0);
bd1c149a AV	443
34db8aaf DH	444	#ifdef CONFIG_PROC_FS
	445	struct seq_file;
	446	extern void render_sigset_t(struct seq_file , const char , sigset_t *);
	447	#endif
	448
1da177e4	449	#endif /* _LINUX_SIGNAL_H */