[linux-block.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))

static inline void copy_siginfo_to_external(siginfo_t *to,
					    const kernel_siginfo_t *from)
{
	memcpy(to, from, sizeof(*from));
	memset(((char *)to) + sizeof(struct kernel_siginfo), 0,
		SI_EXPANSION_SIZE);
}

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);

#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;

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) > 0 && (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 unsafe_save_altstack(uss, sp, label) do { \
	stack_t __user *__uss = uss; \
	struct task_struct *t = current; \
	unsafe_put_user((void __user *)t->sas_ss_sp, &__uss->ss_sp, label); \
	unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
	unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
	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
fa4751f4 EB	27	static inline void copy_siginfo_to_external(siginfo_t *to,
	28	const kernel_siginfo_t *from)
	29	{
	30	memcpy(to, from, sizeof(*from));
	31	memset(((char *)to) + sizeof(struct kernel_siginfo), 0,
	32	SI_EXPANSION_SIZE);
	33	}
	34
ae7795bc EB	35	int copy_siginfo_to_user(siginfo_t __user to, const kernel_siginfo_t from);
ae7795bc EB	36	int copy_siginfo_from_user(kernel_siginfo_t to, const siginfo_t __user from);
b9253a43	37
cc731525 EB	38	enum siginfo_layout {
	39	SIL_KILL,
	40	SIL_TIMER,
	41	SIL_POLL,
	42	SIL_FAULT,
31931c93 EB	43	SIL_FAULT_MCEERR,
	44	SIL_FAULT_BNDERR,
	45	SIL_FAULT_PKUERR,
cc731525 EB	46	SIL_CHLD,
cc731525 EB	47	SIL_RT,
cc731525	48	SIL_SYS,
cc731525 EB	49	};
cc731525 EB	50
a3670058	51	enum siginfo_layout siginfo_layout(unsigned sig, int si_code);
cc731525	52
1da177e4 LT	53	/*
	54	* Define some primitives to manipulate sigset_t.
	55	*/
	56
	57	#ifndef __HAVE_ARCH_SIG_BITOPS
	58	#include <linux/bitops.h>
	59
	60	/* We don't use <linux/bitops.h> for these because there is no need to
	61	be atomic. */
	62	static inline void sigaddset(sigset_t *set, int _sig)
	63	{
	64	unsigned long sig = _sig - 1;
	65	if (_NSIG_WORDS == 1)
	66	set->sig[0] \|= 1UL << sig;
	67	else
	68	set->sig[sig / _NSIG_BPW] \|= 1UL << (sig % _NSIG_BPW);
	69	}
	70
	71	static inline void sigdelset(sigset_t *set, int _sig)
	72	{
	73	unsigned long sig = _sig - 1;
	74	if (_NSIG_WORDS == 1)
	75	set->sig[0] &= ~(1UL << sig);
	76	else
	77	set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
	78	}
	79
	80	static inline int sigismember(sigset_t *set, int _sig)
	81	{
	82	unsigned long sig = _sig - 1;
	83	if (_NSIG_WORDS == 1)
	84	return 1 & (set->sig[0] >> sig);
	85	else
	86	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
	87	}
	88
1da177e4 LT	89	#endif /* __HAVE_ARCH_SIG_BITOPS */
1da177e4 LT	90
71fabd5e GA	91	static inline int sigisemptyset(sigset_t *set)
71fabd5e GA	92	{
71fabd5e GA	93	switch (_NSIG_WORDS) {
	94	case 4:
	95	return (set->sig[3] \| set->sig[2] \|
	96	set->sig[1] \| set->sig[0]) == 0;
	97	case 2:
	98	return (set->sig[1] \| set->sig[0]) == 0;
	99	case 1:
	100	return set->sig[0] == 0;
	101	default:
1c3bea0e	102	BUILD_BUG();
71fabd5e GA	103	return 0;
	104	}
	105	}
	106
c7be96af WL	107	static inline int sigequalsets(const sigset_t set1, const sigset_t set2)
	108	{
	109	switch (_NSIG_WORDS) {
	110	case 4:
	111	return (set1->sig[3] == set2->sig[3]) &&
	112	(set1->sig[2] == set2->sig[2]) &&
	113	(set1->sig[1] == set2->sig[1]) &&
	114	(set1->sig[0] == set2->sig[0]);
	115	case 2:
	116	return (set1->sig[1] == set2->sig[1]) &&
	117	(set1->sig[0] == set2->sig[0]);
	118	case 1:
	119	return set1->sig[0] == set2->sig[0];
	120	}
	121	return 0;
	122	}
	123
1da177e4 LT	124	#define sigmask(sig) (1UL << ((sig) - 1))
	125
	126	#ifndef __HAVE_ARCH_SIG_SETOPS
	127	#include <linux/string.h>
	128
	129	#define _SIG_SET_BINOP(name, op) \
	130	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	131	{ \
1da177e4 LT	132	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	133	\
	134	switch (_NSIG_WORDS) { \
1c3bea0e	135	case 4: \
1da177e4 LT	136	a3 = a->sig[3]; a2 = a->sig[2]; \
	137	b3 = b->sig[3]; b2 = b->sig[2]; \
	138	r->sig[3] = op(a3, b3); \
	139	r->sig[2] = op(a2, b2); \
3819ddec	140	/* fall through */ \
1c3bea0e	141	case 2: \
1da177e4 LT	142	a1 = a->sig[1]; b1 = b->sig[1]; \
1da177e4 LT	143	r->sig[1] = op(a1, b1); \
3819ddec	144	/* fall through */ \
1c3bea0e	145	case 1: \
1da177e4 LT	146	a0 = a->sig[0]; b0 = b->sig[0]; \
	147	r->sig[0] = op(a0, b0); \
	148	break; \
1c3bea0e ON	149	default: \
1c3bea0e ON	150	BUILD_BUG(); \
1da177e4 LT	151	} \
	152	}
	153
	154	#define _sig_or(x,y) ((x) \| (y))
	155	_SIG_SET_BINOP(sigorsets, _sig_or)
	156
	157	#define _sig_and(x,y) ((x) & (y))
	158	_SIG_SET_BINOP(sigandsets, _sig_and)
	159
702a5073 ON	160	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	161	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	162
	163	#undef _SIG_SET_BINOP
	164	#undef _sig_or
	165	#undef _sig_and
702a5073	166	#undef _sig_andn
1da177e4 LT	167
	168	#define _SIG_SET_OP(name, op) \
	169	static inline void name(sigset_t *set) \
	170	{ \
1da177e4	171	switch (_NSIG_WORDS) { \
1c3bea0e ON	172	case 4: set->sig[3] = op(set->sig[3]); \
1c3bea0e ON	173	set->sig[2] = op(set->sig[2]); \
3819ddec	174	/* fall through */ \
1c3bea0e	175	case 2: set->sig[1] = op(set->sig[1]); \
3819ddec	176	/* fall through */ \
1c3bea0e	177	case 1: set->sig[0] = op(set->sig[0]); \
1da177e4	178	break; \
1c3bea0e ON	179	default: \
1c3bea0e ON	180	BUILD_BUG(); \
1da177e4 LT	181	} \
	182	}
	183
	184	#define _sig_not(x) (~(x))
	185	_SIG_SET_OP(signotset, _sig_not)
	186
	187	#undef _SIG_SET_OP
	188	#undef _sig_not
	189
	190	static inline void sigemptyset(sigset_t *set)
	191	{
	192	switch (_NSIG_WORDS) {
	193	default:
	194	memset(set, 0, sizeof(sigset_t));
	195	break;
	196	case 2: set->sig[1] = 0;
3819ddec	197	/* fall through */
1da177e4 LT	198	case 1: set->sig[0] = 0;
	199	break;
	200	}
	201	}
	202
	203	static inline void sigfillset(sigset_t *set)
	204	{
	205	switch (_NSIG_WORDS) {
	206	default:
	207	memset(set, -1, sizeof(sigset_t));
	208	break;
	209	case 2: set->sig[1] = -1;
3819ddec	210	/* fall through */
1da177e4 LT	211	case 1: set->sig[0] = -1;
	212	break;
	213	}
	214	}
	215
	216	/* Some extensions for manipulating the low 32 signals in particular. */
	217
	218	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	219	{
	220	set->sig[0] \|= mask;
	221	}
	222
	223	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	224	{
	225	set->sig[0] &= ~mask;
	226	}
	227
	228	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	229	{
	230	return (set->sig[0] & mask) != 0;
	231	}
	232
	233	static inline void siginitset(sigset_t *set, unsigned long mask)
	234	{
	235	set->sig[0] = mask;
	236	switch (_NSIG_WORDS) {
	237	default:
	238	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
	239	break;
	240	case 2: set->sig[1] = 0;
	241	case 1: ;
	242	}
	243	}
	244
	245	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
	246	{
	247	set->sig[0] = ~mask;
	248	switch (_NSIG_WORDS) {
	249	default:
	250	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
	251	break;
	252	case 2: set->sig[1] = -1;
	253	case 1: ;
	254	}
	255	}
	256
	257	#endif /* __HAVE_ARCH_SIG_SETOPS */
	258
	259	static inline void init_sigpending(struct sigpending *sig)
	260	{
	261	sigemptyset(&sig->signal);
	262	INIT_LIST_HEAD(&sig->list);
	263	}
	264
6a14c5c9 ON	265	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	266
e5bdd883 JJ	267	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	268	static inline int valid_signal(unsigned long sig)
	269	{
	270	return sig <= _NSIG ? 1 : 0;
	271	}
	272
b2b07e4f ON	273	struct timespec;
b2b07e4f ON	274	struct pt_regs;
01024980	275	enum pid_type;
b2b07e4f	276
fba2afaa	277	extern int next_signal(struct sigpending pending, sigset_t mask);
ae7795bc	278	extern int do_send_sig_info(int sig, struct kernel_siginfo *info,
40b3b025	279	struct task_struct *p, enum pid_type type);
ae7795bc	280	extern int group_send_sig_info(int sig, struct kernel_siginfo *info,
01024980	281	struct task_struct *p, enum pid_type type);
ae7795bc	282	extern int __group_send_sig_info(int, struct kernel_siginfo , struct task_struct );
1da177e4	283	extern int sigprocmask(int, sigset_t , sigset_t );
77097ae5 AV	284	extern void set_current_blocked(sigset_t *);
77097ae5 AV	285	extern void __set_current_blocked(const sigset_t *);
abd4f750	286	extern int show_unhandled_signals;
1da177e4	287
20ab7218	288	extern bool get_signal(struct ksignal *ksig);
2ce5da17	289	extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
d12619b5	290	extern void exit_signals(struct task_struct *tsk);
b4e74264 ON	291	extern void kernel_sigaction(int, __sighandler_t);
b4e74264 ON	292
33da8e7c EB	293	#define SIG_KTHREAD ((__force __sighandler_t)2)
	294	#define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3)
	295
b4e74264 ON	296	static inline void allow_signal(int sig)
	297	{
	298	/*
	299	* Kernel threads handle their own signals. Let the signal code
	300	* know it'll be handled, so that they don't get converted to
	301	* SIGKILL or just silently dropped.
	302	*/
33da8e7c EB	303	kernel_sigaction(sig, SIG_KTHREAD);
	304	}
	305
	306	static inline void allow_kernel_signal(int sig)
	307	{
	308	/*
	309	* Kernel threads handle their own signals. Let the signal code
	310	* know signals sent by the kernel will be handled, so that they
	311	* don't get silently dropped.
	312	*/
	313	kernel_sigaction(sig, SIG_KTHREAD_KERNEL);
b4e74264 ON	314	}
	315
	316	static inline void disallow_signal(int sig)
	317	{
	318	kernel_sigaction(sig, SIG_IGN);
	319	}
1da177e4	320
298ec1e2 CL	321	extern struct kmem_cache *sighand_cachep;
298ec1e2 CL	322
67a48a24	323	extern bool unhandled_signal(struct task_struct *tsk, int sig);
abd4f750	324
55c0d1f8 RM	325	/*
	326	* In POSIX a signal is sent either to a specific thread (Linux task)
	327	* or to the process as a whole (Linux thread group). How the signal
	328	* is sent determines whether it's to one thread or the whole group,
	329	* which determines which signal mask(s) are involved in blocking it
	330	* from being delivered until later. When the signal is delivered,
	331	* either it's caught or ignored by a user handler or it has a default
	332	* effect that applies to the whole thread group (POSIX process).
	333	*
	334	* The possible effects an unblocked signal set to SIG_DFL can have are:
	335	* ignore - Nothing Happens
	336	* terminate - kill the process, i.e. all threads in the group,
	337	* similar to exit_group. The group leader (only) reports
	338	* WIFSIGNALED status to its parent.
	339	* coredump - write a core dump file describing all threads using
	340	* the same mm and then kill all those threads
	341	* stop - stop all the threads in the group, i.e. TASK_STOPPED state
	342	*
	343	* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
	344	* Other signals when not blocked and set to SIG_DFL behaves as follows.
	345	* The job control signals also have other special effects.
	346	*
	347	* +--------------------+------------------+
	348	* \| POSIX signal \| default action \|
	349	* +--------------------+------------------+
	350	* \| SIGHUP \| terminate \|
	351	* \| SIGINT \| terminate \|
	352	* \| SIGQUIT \| coredump \|
	353	* \| SIGILL \| coredump \|
	354	* \| SIGTRAP \| coredump \|
	355	* \| SIGABRT/SIGIOT \| coredump \|
	356	* \| SIGBUS \| coredump \|
	357	* \| SIGFPE \| coredump \|
	358	* \| SIGKILL \| terminate(+) \|
	359	* \| SIGUSR1 \| terminate \|
	360	* \| SIGSEGV \| coredump \|
	361	* \| SIGUSR2 \| terminate \|
	362	* \| SIGPIPE \| terminate \|
	363	* \| SIGALRM \| terminate \|
	364	* \| SIGTERM \| terminate \|
	365	* \| SIGCHLD \| ignore \|
	366	* \| SIGCONT \| ignore(*) \|
	367	* \| SIGSTOP \| stop(*)(+) \|
	368	* \| SIGTSTP \| stop(*) \|
	369	* \| SIGTTIN \| stop(*) \|
	370	* \| SIGTTOU \| stop(*) \|
	371	* \| SIGURG \| ignore \|
	372	* \| SIGXCPU \| coredump \|
	373	* \| SIGXFSZ \| coredump \|
	374	* \| SIGVTALRM \| terminate \|
	375	* \| SIGPROF \| terminate \|
	376	* \| SIGPOLL/SIGIO \| terminate \|
	377	* \| SIGSYS/SIGUNUSED \| coredump \|
	378	* \| SIGSTKFLT \| terminate \|
	379	* \| SIGWINCH \| ignore \|
	380	* \| SIGPWR \| terminate \|
	381	* \| SIGRTMIN-SIGRTMAX \| terminate \|
	382	* +--------------------+------------------+
	383	* \| non-POSIX signal \| default action \|
	384	* +--------------------+------------------+
	385	* \| SIGEMT \| coredump \|
	386	* +--------------------+------------------+
	387	*
	388	* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
389	* (*) Special job control effects:
390	* When SIGCONT is sent, it resumes the process (all threads in the group)
391	* from TASK_STOPPED state and also clears any pending/queued stop signals
392	* (any of those marked with "stop(*)"). This happens regardless of blocking,
393	* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
394	* any pending/queued SIGCONT signals; this happens regardless of blocking,
395	* catching, or ignored the stop signal, though (except for SIGSTOP) the
396	* default action of stopping the process may happen later or never.
397	*/
398
399	#ifdef SIGEMT
400	#define SIGEMT_MASK rt_sigmask(SIGEMT)
401	#else
402	#define SIGEMT_MASK 0
403	#endif
404
405	#if SIGRTMIN > BITS_PER_LONG
406	#define rt_sigmask(sig) (1ULL << ((sig)-1))
407	#else
408	#define rt_sigmask(sig) sigmask(sig)
409	#endif
5c8ccefd ON	410
5c8ccefd ON	411	#define siginmask(sig, mask) \
ee17e5d6	412	((sig) > 0 && (sig) < SIGRTMIN && (rt_sigmask(sig) & (mask)))
55c0d1f8 RM	413
	414	#define SIG_KERNEL_ONLY_MASK (\
	415	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
	416
	417	#define SIG_KERNEL_STOP_MASK (\
	418	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
	419	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
	420
	421	#define SIG_KERNEL_COREDUMP_MASK (\
	422	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
	423	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
	424	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
	425	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
	426	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
	427	SIGEMT_MASK )
	428
	429	#define SIG_KERNEL_IGNORE_MASK (\
	430	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
	431	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
	432
d08477aa EB	433	#define SIG_SPECIFIC_SICODES_MASK (\
	434	rt_sigmask(SIGILL) \| rt_sigmask(SIGFPE) \| \
	435	rt_sigmask(SIGSEGV) \| rt_sigmask(SIGBUS) \| \
	436	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGCHLD) \| \
	437	rt_sigmask(SIGPOLL) \| rt_sigmask(SIGSYS) \| \
	438	SIGEMT_MASK )
	439
5c8ccefd ON	440	#define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK)
	441	#define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK)
	442	#define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK)
	443	#define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK)
d08477aa	444	#define sig_specific_sicodes(sig) siginmask(sig, SIG_SPECIFIC_SICODES_MASK)
55c0d1f8	445
55c0d1f8 RM	446	#define sig_fatal(t, signr) \
	447	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	448	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	449
a1c9eea9 AB	450	void signals_init(void);
a1c9eea9 AB	451
5c49574f	452	int restore_altstack(const stack_t __user *);
c40702c4	453	int __save_altstack(stack_t __user *, unsigned long);
5c49574f	454
119cd59f	455	#define unsafe_save_altstack(uss, sp, label) do { \
bd1c149a AV	456	stack_t __user *__uss = uss; \
bd1c149a AV	457	struct task_struct *t = current; \
119cd59f AV	458	unsafe_put_user((void __user *)t->sas_ss_sp, &__uss->ss_sp, label); \
	459	unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
	460	unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
2a742138 SS	461	if (t->sas_ss_flags & SS_AUTODISARM) \
2a742138 SS	462	sas_ss_reset(t); \
bd1c149a AV	463	} while (0);
bd1c149a AV	464
34db8aaf DH	465	#ifdef CONFIG_PROC_FS
	466	struct seq_file;
	467	extern void render_sigset_t(struct seq_file , const char , sigset_t *);
	468	#endif
	469
1da177e4	470	#endif /* _LINUX_SIGNAL_H */