include/linux/signal.h - third_party/kernel - Git at Google

 /* 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_TRAPNO,
 	SIL_FAULT_MCEERR,
 	SIL_FAULT_BNDERR,
 	SIL_FAULT_PKUERR,
 	SIL_FAULT_PERF_EVENT,
 	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);					\
 		fallthrough;						\
 	case 2:								\
 		a1 = a->sig[1]; b1 = b->sig[1];				\
 		r->sig[1] = op(a1, b1);					\
 		fallthrough;						\
 	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]);				\
 		fallthrough;						\
 	case 2:	set->sig[1] = op(set->sig[1]);				\
 		fallthrough;						\
 	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;
 		fallthrough;
 	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;
 		fallthrough;
 	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;
 		break;
 	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;
 		break;
 	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); \
 } while (0);

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

 #ifndef arch_untagged_si_addr
 /*
  * Given a fault address and a signal and si_code which correspond to the
  * _sigfault union member, returns the address that must appear in si_addr if
  * the signal handler does not have SA_EXPOSE_TAGBITS enabled in sa_flags.
  */
 static inline void __user *arch_untagged_si_addr(void __user *addr,
 						 unsigned long sig,
 						 unsigned long si_code)
 {
 	return addr;
 }
 #endif

 #endif /* _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_TRAPNO,
	SIL_FAULT_MCEERR,
	SIL_FAULT_BNDERR,
	SIL_FAULT_PKUERR,
	SIL_FAULT_PERF_EVENT,
	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); \
	fallthrough; \
	case 2: \
	a1 = a->sig[1]; b1 = b->sig[1]; \
	r->sig[1] = op(a1, b1); \
	fallthrough; \
	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]); \
	fallthrough; \
	case 2: set->sig[1] = op(set->sig[1]); \
	fallthrough; \
	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;
	fallthrough;
	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;
	fallthrough;
	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;
	break;
	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;
	break;
	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); \
	} while (0);

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

	#ifndef arch_untagged_si_addr
	/*
	* Given a fault address and a signal and si_code which correspond to the
	* _sigfault union member, returns the address that must appear in si_addr if
	* the signal handler does not have SA_EXPOSE_TAGBITS enabled in sa_flags.
	*/
	static inline void __user arch_untagged_si_addr(void __user addr,
	unsigned long sig,
	unsigned long si_code)
	{
	return addr;
	}
	#endif

	#endif /* _LINUX_SIGNAL_H */