[linux-2.6-block.git] / include / linux / signal.h

#ifndef _LINUX_SIGNAL_H
#define _LINUX_SIGNAL_H

#include <linux/list.h>
#include <linux/bug.h>
#include <uapi/linux/signal.h>

struct task_struct;

/* for sysctl */
extern int print_fatal_signals;
/*
 * Real Time signals may be queued.
 */

struct sigqueue {
	struct list_head list;
	int flags;
	siginfo_t info;
	struct user_struct *user;
};

/* flags values. */
#define SIGQUEUE_PREALLOC	1

struct sigpending {
	struct list_head list;
	sigset_t signal;
};

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

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

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

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

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

#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;
	}
}

#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 do_sigtimedwait(const sigset_t *, siginfo_t *,
				const struct timespec *);
extern int sigprocmask(int, sigset_t *, sigset_t *);
extern void set_current_blocked(sigset_t *);
extern void __set_current_blocked(const sigset_t *);
extern int show_unhandled_signals;
extern int sigsuspend(sigset_t *);

struct sigaction {
#ifndef __ARCH_HAS_IRIX_SIGACTION
	__sighandler_t	sa_handler;
	unsigned long	sa_flags;
#else
	unsigned int	sa_flags;
	__sighandler_t	sa_handler;
#endif
#ifdef __ARCH_HAS_SA_RESTORER
	__sigrestore_t sa_restorer;
#endif
	sigset_t	sa_mask;	/* mask last for extensibility */
};

struct k_sigaction {
	struct sigaction sa;
#ifdef __ARCH_HAS_KA_RESTORER
	__sigrestore_t ka_restorer;
#endif
};
 
#ifdef CONFIG_OLD_SIGACTION
struct old_sigaction {
	__sighandler_t sa_handler;
	old_sigset_t sa_mask;
	unsigned long sa_flags;
	__sigrestore_t sa_restorer;
};
#endif

struct ksignal {
	struct k_sigaction ka;
	siginfo_t info;
	int sig;
};

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);

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;

int unhandled_signal(struct task_struct *tsk, int sig);

/*
 * In POSIX a signal is sent either to a specific thread (Linux task)
 * or to the process as a whole (Linux thread group).  How the signal
 * is sent determines whether it's to one thread or the whole group,
 * which determines which signal mask(s) are involved in blocking it
 * from being delivered until later.  When the signal is delivered,
 * either it's caught or ignored by a user handler or it has a default
 * effect that applies to the whole thread group (POSIX process).
 *
 * The possible effects an unblocked signal set to SIG_DFL can have are:
 *   ignore	- Nothing Happens
 *   terminate	- kill the process, i.e. all threads in the group,
 * 		  similar to exit_group.  The group leader (only) reports
 *		  WIFSIGNALED status to its parent.
 *   coredump	- write a core dump file describing all threads using
 *		  the same mm and then kill all those threads
 *   stop 	- stop all the threads in the group, i.e. TASK_STOPPED state
 *
 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
 * Other signals when not blocked and set to SIG_DFL behaves as follows.
 * The job control signals also have other special effects.
 *
 *	+--------------------+------------------+
 *	|  POSIX signal      |  default action  |
 *	+--------------------+------------------+
 *	|  SIGHUP            |  terminate	|
 *	|  SIGINT            |	terminate	|
 *	|  SIGQUIT           |	coredump 	|
 *	|  SIGILL            |	coredump 	|
 *	|  SIGTRAP           |	coredump 	|
 *	|  SIGABRT/SIGIOT    |	coredump 	|
 *	|  SIGBUS            |	coredump 	|
 *	|  SIGFPE            |	coredump 	|
 *	|  SIGKILL           |	terminate(+)	|
 *	|  SIGUSR1           |	terminate	|
 *	|  SIGSEGV           |	coredump 	|
 *	|  SIGUSR2           |	terminate	|
 *	|  SIGPIPE           |	terminate	|
 *	|  SIGALRM           |	terminate	|
 *	|  SIGTERM           |	terminate	|
 *	|  SIGCHLD           |	ignore   	|
 *	|  SIGCONT           |	ignore(*)	|
 *	|  SIGSTOP           |	stop(*)(+)  	|
 *	|  SIGTSTP           |	stop(*)  	|
 *	|  SIGTTIN           |	stop(*)  	|
 *	|  SIGTTOU           |	stop(*)  	|
 *	|  SIGURG            |	ignore   	|
 *	|  SIGXCPU           |	coredump 	|
 *	|  SIGXFSZ           |	coredump 	|
 *	|  SIGVTALRM         |	terminate	|
 *	|  SIGPROF           |	terminate	|
 *	|  SIGPOLL/SIGIO     |	terminate	|
 *	|  SIGSYS/SIGUNUSED  |	coredump 	|
 *	|  SIGSTKFLT         |	terminate	|
 *	|  SIGWINCH          |	ignore   	|
 *	|  SIGPWR            |	terminate	|
 *	|  SIGRTMIN-SIGRTMAX |	terminate       |
 *	+--------------------+------------------+
 *	|  non-POSIX signal  |  default action  |
 *	+--------------------+------------------+
 *	|  SIGEMT            |  coredump	|
 *	+--------------------+------------------+
 *
 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
 * (*) Special job control effects:
 * When SIGCONT is sent, it resumes the process (all threads in the group)
 * from TASK_STOPPED state and also clears any pending/queued stop signals
 * (any of those marked with "stop(*)").  This happens regardless of blocking,
 * catching, or ignoring SIGCONT.  When any stop signal is sent, it clears
 * any pending/queued SIGCONT signals; this happens regardless of blocking,
 * catching, or ignored the stop signal, though (except for SIGSTOP) the
 * default action of stopping the process may happen later or never.
 */

#ifdef SIGEMT
#define SIGEMT_MASK	rt_sigmask(SIGEMT)
#else
#define SIGEMT_MASK	0
#endif

#if SIGRTMIN > BITS_PER_LONG
#define rt_sigmask(sig)	(1ULL << ((sig)-1))
#else
#define rt_sigmask(sig)	sigmask(sig)
#endif
#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))

#define SIG_KERNEL_ONLY_MASK (\
	rt_sigmask(SIGKILL)   |  rt_sigmask(SIGSTOP))

#define SIG_KERNEL_STOP_MASK (\
	rt_sigmask(SIGSTOP)   |  rt_sigmask(SIGTSTP)   | \
	rt_sigmask(SIGTTIN)   |  rt_sigmask(SIGTTOU)   )

#define SIG_KERNEL_COREDUMP_MASK (\
        rt_sigmask(SIGQUIT)   |  rt_sigmask(SIGILL)    | \
	rt_sigmask(SIGTRAP)   |  rt_sigmask(SIGABRT)   | \
        rt_sigmask(SIGFPE)    |  rt_sigmask(SIGSEGV)   | \
	rt_sigmask(SIGBUS)    |  rt_sigmask(SIGSYS)    | \
        rt_sigmask(SIGXCPU)   |  rt_sigmask(SIGXFSZ)   | \
	SIGEMT_MASK				       )

#define SIG_KERNEL_IGNORE_MASK (\
        rt_sigmask(SIGCONT)   |  rt_sigmask(SIGCHLD)   | \
	rt_sigmask(SIGWINCH)  |  rt_sigmask(SIGURG)    )

#define sig_kernel_only(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
#define sig_kernel_coredump(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
#define sig_kernel_ignore(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
#define sig_kernel_stop(sig) \
	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))

#define sig_user_defined(t, signr) \
	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) &&	\
	 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))

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

void signals_init(void);

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(sas_ss_flags(sp), &__uss->ss_flags); \
	put_user_ex(t->sas_ss_size, &__uss->ss_size); \
} 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
1da177e4 LT	1	#ifndef _LINUX_SIGNAL_H
	2	#define _LINUX_SIGNAL_H
	3
7ab2febd	4	#include <linux/list.h>
1c3bea0e	5	#include <linux/bug.h>
607ca46e	6	#include <uapi/linux/signal.h>
1da177e4	7
1477fcc2 SR	8	struct task_struct;
1477fcc2 SR	9
d33ed52d DY	10	/* for sysctl */
d33ed52d DY	11	extern int print_fatal_signals;
1da177e4 LT	12	/*
	13	* Real Time signals may be queued.
	14	*/
	15
	16	struct sigqueue {
	17	struct list_head list;
1da177e4 LT	18	int flags;
	19	siginfo_t info;
	20	struct user_struct *user;
	21	};
	22
	23	/* flags values. */
	24	#define SIGQUEUE_PREALLOC 1
	25
	26	struct sigpending {
	27	struct list_head list;
	28	sigset_t signal;
	29	};
	30
	31	/*
	32	* Define some primitives to manipulate sigset_t.
	33	*/
	34
	35	#ifndef __HAVE_ARCH_SIG_BITOPS
	36	#include <linux/bitops.h>
	37
	38	/* We don't use <linux/bitops.h> for these because there is no need to
	39	be atomic. */
	40	static inline void sigaddset(sigset_t *set, int _sig)
	41	{
	42	unsigned long sig = _sig - 1;
	43	if (_NSIG_WORDS == 1)
	44	set->sig[0] \|= 1UL << sig;
	45	else
	46	set->sig[sig / _NSIG_BPW] \|= 1UL << (sig % _NSIG_BPW);
	47	}
	48
	49	static inline void sigdelset(sigset_t *set, int _sig)
	50	{
	51	unsigned long sig = _sig - 1;
	52	if (_NSIG_WORDS == 1)
	53	set->sig[0] &= ~(1UL << sig);
	54	else
	55	set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
	56	}
	57
	58	static inline int sigismember(sigset_t *set, int _sig)
	59	{
	60	unsigned long sig = _sig - 1;
	61	if (_NSIG_WORDS == 1)
	62	return 1 & (set->sig[0] >> sig);
	63	else
	64	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
	65	}
	66
1da177e4 LT	67	#endif /* __HAVE_ARCH_SIG_BITOPS */
1da177e4 LT	68
71fabd5e GA	69	static inline int sigisemptyset(sigset_t *set)
71fabd5e GA	70	{
71fabd5e GA	71	switch (_NSIG_WORDS) {
	72	case 4:
	73	return (set->sig[3] \| set->sig[2] \|
	74	set->sig[1] \| set->sig[0]) == 0;
	75	case 2:
	76	return (set->sig[1] \| set->sig[0]) == 0;
	77	case 1:
	78	return set->sig[0] == 0;
	79	default:
1c3bea0e	80	BUILD_BUG();
71fabd5e GA	81	return 0;
	82	}
	83	}
	84
1da177e4 LT	85	#define sigmask(sig) (1UL << ((sig) - 1))
	86
	87	#ifndef __HAVE_ARCH_SIG_SETOPS
	88	#include <linux/string.h>
	89
	90	#define _SIG_SET_BINOP(name, op) \
	91	static inline void name(sigset_t r, const sigset_t a, const sigset_t *b) \
	92	{ \
1da177e4 LT	93	unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
	94	\
	95	switch (_NSIG_WORDS) { \
1c3bea0e	96	case 4: \
1da177e4 LT	97	a3 = a->sig[3]; a2 = a->sig[2]; \
	98	b3 = b->sig[3]; b2 = b->sig[2]; \
	99	r->sig[3] = op(a3, b3); \
	100	r->sig[2] = op(a2, b2); \
1c3bea0e	101	case 2: \
1da177e4 LT	102	a1 = a->sig[1]; b1 = b->sig[1]; \
1da177e4 LT	103	r->sig[1] = op(a1, b1); \
1c3bea0e	104	case 1: \
1da177e4 LT	105	a0 = a->sig[0]; b0 = b->sig[0]; \
	106	r->sig[0] = op(a0, b0); \
	107	break; \
1c3bea0e ON	108	default: \
1c3bea0e ON	109	BUILD_BUG(); \
1da177e4 LT	110	} \
	111	}
	112
	113	#define _sig_or(x,y) ((x) \| (y))
	114	_SIG_SET_BINOP(sigorsets, _sig_or)
	115
	116	#define _sig_and(x,y) ((x) & (y))
	117	_SIG_SET_BINOP(sigandsets, _sig_and)
	118
702a5073 ON	119	#define _sig_andn(x,y) ((x) & ~(y))
702a5073 ON	120	_SIG_SET_BINOP(sigandnsets, _sig_andn)
1da177e4 LT	121
	122	#undef _SIG_SET_BINOP
	123	#undef _sig_or
	124	#undef _sig_and
702a5073	125	#undef _sig_andn
1da177e4 LT	126
	127	#define _SIG_SET_OP(name, op) \
	128	static inline void name(sigset_t *set) \
	129	{ \
1da177e4	130	switch (_NSIG_WORDS) { \
1c3bea0e ON	131	case 4: set->sig[3] = op(set->sig[3]); \
	132	set->sig[2] = op(set->sig[2]); \
	133	case 2: set->sig[1] = op(set->sig[1]); \
	134	case 1: set->sig[0] = op(set->sig[0]); \
1da177e4	135	break; \
1c3bea0e ON	136	default: \
1c3bea0e ON	137	BUILD_BUG(); \
1da177e4 LT	138	} \
	139	}
	140
	141	#define _sig_not(x) (~(x))
	142	_SIG_SET_OP(signotset, _sig_not)
	143
	144	#undef _SIG_SET_OP
	145	#undef _sig_not
	146
	147	static inline void sigemptyset(sigset_t *set)
	148	{
	149	switch (_NSIG_WORDS) {
	150	default:
	151	memset(set, 0, sizeof(sigset_t));
	152	break;
	153	case 2: set->sig[1] = 0;
	154	case 1: set->sig[0] = 0;
	155	break;
	156	}
	157	}
	158
	159	static inline void sigfillset(sigset_t *set)
	160	{
	161	switch (_NSIG_WORDS) {
	162	default:
	163	memset(set, -1, sizeof(sigset_t));
	164	break;
	165	case 2: set->sig[1] = -1;
	166	case 1: set->sig[0] = -1;
	167	break;
	168	}
	169	}
	170
	171	/* Some extensions for manipulating the low 32 signals in particular. */
	172
	173	static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
	174	{
	175	set->sig[0] \|= mask;
	176	}
	177
	178	static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
	179	{
	180	set->sig[0] &= ~mask;
	181	}
	182
	183	static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
	184	{
	185	return (set->sig[0] & mask) != 0;
	186	}
	187
	188	static inline void siginitset(sigset_t *set, unsigned long mask)
	189	{
	190	set->sig[0] = mask;
	191	switch (_NSIG_WORDS) {
	192	default:
	193	memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
	194	break;
	195	case 2: set->sig[1] = 0;
	196	case 1: ;
	197	}
	198	}
	199
	200	static inline void siginitsetinv(sigset_t *set, unsigned long mask)
	201	{
202	set->sig[0] = ~mask;
203	switch (_NSIG_WORDS) {
204	default:
205	memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
206	break;
207	case 2: set->sig[1] = -1;
208	case 1: ;
209	}
210	}
211
212	#endif /* __HAVE_ARCH_SIG_SETOPS */
213
214	static inline void init_sigpending(struct sigpending *sig)
215	{
216	sigemptyset(&sig->signal);
217	INIT_LIST_HEAD(&sig->list);
218	}
219
6a14c5c9 ON	220	extern void flush_sigqueue(struct sigpending *queue);
6a14c5c9 ON	221
e5bdd883 JJ	222	/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
	223	static inline int valid_signal(unsigned long sig)
	224	{
	225	return sig <= _NSIG ? 1 : 0;
	226	}
	227
b2b07e4f ON	228	struct timespec;
	229	struct pt_regs;
	230
fba2afaa	231	extern int next_signal(struct sigpending pending, sigset_t mask);
4a30debf ON	232	extern int do_send_sig_info(int sig, struct siginfo *info,
4a30debf ON	233	struct task_struct *p, bool group);
1da177e4 LT	234	extern int group_send_sig_info(int sig, struct siginfo info, struct task_struct p);
1da177e4 LT	235	extern int __group_send_sig_info(int, struct siginfo , struct task_struct );
943df148 ON	236	extern int do_sigtimedwait(const sigset_t , siginfo_t ,
943df148 ON	237	const struct timespec *);
1da177e4	238	extern int sigprocmask(int, sigset_t , sigset_t );
77097ae5 AV	239	extern void set_current_blocked(sigset_t *);
77097ae5 AV	240	extern void __set_current_blocked(const sigset_t *);
abd4f750	241	extern int show_unhandled_signals;
68f3f16d	242	extern int sigsuspend(sigset_t *);
1da177e4	243
574c4866	244	struct sigaction {
2a148698	245	#ifndef __ARCH_HAS_IRIX_SIGACTION
574c4866 AV	246	__sighandler_t sa_handler;
	247	unsigned long sa_flags;
	248	#else
2a148698	249	unsigned int sa_flags;
574c4866 AV	250	__sighandler_t sa_handler;
	251	#endif
	252	#ifdef __ARCH_HAS_SA_RESTORER
	253	__sigrestore_t sa_restorer;
	254	#endif
	255	sigset_t sa_mask; /* mask last for extensibility */
	256	};
	257
92a3ce4a AV	258	struct k_sigaction {
	259	struct sigaction sa;
	260	#ifdef __ARCH_HAS_KA_RESTORER
	261	__sigrestore_t ka_restorer;
	262	#endif
	263	};
495dfbf7 AV	264
	265	#ifdef CONFIG_OLD_SIGACTION
	266	struct old_sigaction {
	267	__sighandler_t sa_handler;
	268	old_sigset_t sa_mask;
	269	unsigned long sa_flags;
	270	__sigrestore_t sa_restorer;
	271	};
	272	#endif
92a3ce4a	273
ca86b5dc AV	274	struct ksignal {
	275	struct k_sigaction ka;
	276	siginfo_t info;
	277	int sig;
	278	};
	279
828b1f65	280	extern int 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
abd4f750 MAS	302	int unhandled_signal(struct task_struct *tsk, int sig);
abd4f750 MAS	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
389	#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
390
391	#define SIG_KERNEL_ONLY_MASK (\
392	rt_sigmask(SIGKILL) \| rt_sigmask(SIGSTOP))
393
394	#define SIG_KERNEL_STOP_MASK (\
395	rt_sigmask(SIGSTOP) \| rt_sigmask(SIGTSTP) \| \
396	rt_sigmask(SIGTTIN) \| rt_sigmask(SIGTTOU) )
397
398	#define SIG_KERNEL_COREDUMP_MASK (\
399	rt_sigmask(SIGQUIT) \| rt_sigmask(SIGILL) \| \
400	rt_sigmask(SIGTRAP) \| rt_sigmask(SIGABRT) \| \
401	rt_sigmask(SIGFPE) \| rt_sigmask(SIGSEGV) \| \
402	rt_sigmask(SIGBUS) \| rt_sigmask(SIGSYS) \| \
403	rt_sigmask(SIGXCPU) \| rt_sigmask(SIGXFSZ) \| \
404	SIGEMT_MASK )
405
406	#define SIG_KERNEL_IGNORE_MASK (\
407	rt_sigmask(SIGCONT) \| rt_sigmask(SIGCHLD) \| \
408	rt_sigmask(SIGWINCH) \| rt_sigmask(SIGURG) )
409
410	#define sig_kernel_only(sig) \
411	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
412	#define sig_kernel_coredump(sig) \
413	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
414	#define sig_kernel_ignore(sig) \
415	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
416	#define sig_kernel_stop(sig) \
417	(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
418
55c0d1f8 RM	419	#define sig_user_defined(t, signr) \
	420	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
	421	((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
	422
	423	#define sig_fatal(t, signr) \
	424	(!siginmask(signr, SIG_KERNEL_IGNORE_MASK\|SIG_KERNEL_STOP_MASK) && \
	425	(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
	426
a1c9eea9 AB	427	void signals_init(void);
a1c9eea9 AB	428
5c49574f	429	int restore_altstack(const stack_t __user *);
c40702c4	430	int __save_altstack(stack_t __user *, unsigned long);
5c49574f	431
bd1c149a AV	432	#define save_altstack_ex(uss, sp) do { \
	433	stack_t __user *__uss = uss; \
	434	struct task_struct *t = current; \
	435	put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
	436	put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
	437	put_user_ex(t->sas_ss_size, &__uss->ss_size); \
	438	} while (0);
	439
34db8aaf DH	440	#ifdef CONFIG_PROC_FS
	441	struct seq_file;
	442	extern void render_sigset_t(struct seq_file , const char , sigset_t *);
	443	#endif
	444
1da177e4	445	#endif /* _LINUX_SIGNAL_H */