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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SIGNAL_H
2#define _LINUX_SIGNAL_H
3
David Woodhouse7ab2feb2006-04-25 14:55:46 +01004#include <linux/list.h>
David Howells607ca462012-10-13 10:46:48 +01005#include <uapi/linux/signal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
Stephen Rothwell1477fcc2011-05-20 11:11:53 +10007struct task_struct;
8
Dave Youngd33ed522010-03-10 15:23:59 -08009/* for sysctl */
10extern int print_fatal_signals;
Linus Torvalds1da177e2005-04-16 15:20:36 -070011/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * Real Time signals may be queued.
13 */
14
15struct sigqueue {
16 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 int flags;
18 siginfo_t info;
19 struct user_struct *user;
20};
21
22/* flags values. */
23#define SIGQUEUE_PREALLOC 1
24
25struct sigpending {
26 struct list_head list;
27 sigset_t signal;
28};
29
30/*
31 * Define some primitives to manipulate sigset_t.
32 */
33
34#ifndef __HAVE_ARCH_SIG_BITOPS
35#include <linux/bitops.h>
36
37/* We don't use <linux/bitops.h> for these because there is no need to
38 be atomic. */
39static inline void sigaddset(sigset_t *set, int _sig)
40{
41 unsigned long sig = _sig - 1;
42 if (_NSIG_WORDS == 1)
43 set->sig[0] |= 1UL << sig;
44 else
45 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
46}
47
48static inline void sigdelset(sigset_t *set, int _sig)
49{
50 unsigned long sig = _sig - 1;
51 if (_NSIG_WORDS == 1)
52 set->sig[0] &= ~(1UL << sig);
53 else
54 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
55}
56
57static inline int sigismember(sigset_t *set, int _sig)
58{
59 unsigned long sig = _sig - 1;
60 if (_NSIG_WORDS == 1)
61 return 1 & (set->sig[0] >> sig);
62 else
63 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
64}
65
66static inline int sigfindinword(unsigned long word)
67{
68 return ffz(~word);
69}
70
71#endif /* __HAVE_ARCH_SIG_BITOPS */
72
George Anzinger71fabd52006-01-08 01:02:48 -080073static inline int sigisemptyset(sigset_t *set)
74{
75 extern void _NSIG_WORDS_is_unsupported_size(void);
76 switch (_NSIG_WORDS) {
77 case 4:
78 return (set->sig[3] | set->sig[2] |
79 set->sig[1] | set->sig[0]) == 0;
80 case 2:
81 return (set->sig[1] | set->sig[0]) == 0;
82 case 1:
83 return set->sig[0] == 0;
84 default:
85 _NSIG_WORDS_is_unsupported_size();
86 return 0;
87 }
88}
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#define sigmask(sig) (1UL << ((sig) - 1))
91
92#ifndef __HAVE_ARCH_SIG_SETOPS
93#include <linux/string.h>
94
95#define _SIG_SET_BINOP(name, op) \
96static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
97{ \
98 extern void _NSIG_WORDS_is_unsupported_size(void); \
99 unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
100 \
101 switch (_NSIG_WORDS) { \
102 case 4: \
103 a3 = a->sig[3]; a2 = a->sig[2]; \
104 b3 = b->sig[3]; b2 = b->sig[2]; \
105 r->sig[3] = op(a3, b3); \
106 r->sig[2] = op(a2, b2); \
107 case 2: \
108 a1 = a->sig[1]; b1 = b->sig[1]; \
109 r->sig[1] = op(a1, b1); \
110 case 1: \
111 a0 = a->sig[0]; b0 = b->sig[0]; \
112 r->sig[0] = op(a0, b0); \
113 break; \
114 default: \
115 _NSIG_WORDS_is_unsupported_size(); \
116 } \
117}
118
119#define _sig_or(x,y) ((x) | (y))
120_SIG_SET_BINOP(sigorsets, _sig_or)
121
122#define _sig_and(x,y) ((x) & (y))
123_SIG_SET_BINOP(sigandsets, _sig_and)
124
Oleg Nesterov702a5072011-04-27 22:01:27 +0200125#define _sig_andn(x,y) ((x) & ~(y))
126_SIG_SET_BINOP(sigandnsets, _sig_andn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128#undef _SIG_SET_BINOP
129#undef _sig_or
130#undef _sig_and
Oleg Nesterov702a5072011-04-27 22:01:27 +0200131#undef _sig_andn
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133#define _SIG_SET_OP(name, op) \
134static inline void name(sigset_t *set) \
135{ \
136 extern void _NSIG_WORDS_is_unsupported_size(void); \
137 \
138 switch (_NSIG_WORDS) { \
139 case 4: set->sig[3] = op(set->sig[3]); \
140 set->sig[2] = op(set->sig[2]); \
141 case 2: set->sig[1] = op(set->sig[1]); \
142 case 1: set->sig[0] = op(set->sig[0]); \
143 break; \
144 default: \
145 _NSIG_WORDS_is_unsupported_size(); \
146 } \
147}
148
149#define _sig_not(x) (~(x))
150_SIG_SET_OP(signotset, _sig_not)
151
152#undef _SIG_SET_OP
153#undef _sig_not
154
155static inline void sigemptyset(sigset_t *set)
156{
157 switch (_NSIG_WORDS) {
158 default:
159 memset(set, 0, sizeof(sigset_t));
160 break;
161 case 2: set->sig[1] = 0;
162 case 1: set->sig[0] = 0;
163 break;
164 }
165}
166
167static inline void sigfillset(sigset_t *set)
168{
169 switch (_NSIG_WORDS) {
170 default:
171 memset(set, -1, sizeof(sigset_t));
172 break;
173 case 2: set->sig[1] = -1;
174 case 1: set->sig[0] = -1;
175 break;
176 }
177}
178
179/* Some extensions for manipulating the low 32 signals in particular. */
180
181static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
182{
183 set->sig[0] |= mask;
184}
185
186static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
187{
188 set->sig[0] &= ~mask;
189}
190
191static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
192{
193 return (set->sig[0] & mask) != 0;
194}
195
196static inline void siginitset(sigset_t *set, unsigned long mask)
197{
198 set->sig[0] = mask;
199 switch (_NSIG_WORDS) {
200 default:
201 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
202 break;
203 case 2: set->sig[1] = 0;
204 case 1: ;
205 }
206}
207
208static inline void siginitsetinv(sigset_t *set, unsigned long mask)
209{
210 set->sig[0] = ~mask;
211 switch (_NSIG_WORDS) {
212 default:
213 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
214 break;
215 case 2: set->sig[1] = -1;
216 case 1: ;
217 }
218}
219
220#endif /* __HAVE_ARCH_SIG_SETOPS */
221
222static inline void init_sigpending(struct sigpending *sig)
223{
224 sigemptyset(&sig->signal);
225 INIT_LIST_HEAD(&sig->list);
226}
227
Oleg Nesterov6a14c5c2006-03-28 16:11:18 -0800228extern void flush_sigqueue(struct sigpending *queue);
229
Jesper Juhle5bdd882005-05-01 08:59:13 -0700230/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
231static inline int valid_signal(unsigned long sig)
232{
233 return sig <= _NSIG ? 1 : 0;
234}
235
Oleg Nesterovb2b07e42011-05-18 15:08:03 +0200236struct timespec;
237struct pt_regs;
238
Davide Libenzifba2afa2007-05-10 22:23:13 -0700239extern int next_signal(struct sigpending *pending, sigset_t *mask);
Oleg Nesterov4a30deb2009-09-23 15:57:00 -0700240extern int do_send_sig_info(int sig, struct siginfo *info,
241 struct task_struct *p, bool group);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
243extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
Oleg Nesterov943df142011-04-27 21:44:14 +0200244extern int do_sigtimedwait(const sigset_t *, siginfo_t *,
245 const struct timespec *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246extern int sigprocmask(int, sigset_t *, sigset_t *);
Al Viro77097ae2012-04-27 13:58:59 -0400247extern void set_current_blocked(sigset_t *);
248extern void __set_current_blocked(const sigset_t *);
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +0200249extern int show_unhandled_signals;
Al Viro68f3f162012-05-21 21:42:32 -0400250extern int sigsuspend(sigset_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Al Viro574c4862012-11-25 22:24:19 -0500252struct sigaction {
David Howells2a148692013-03-19 14:00:53 +0000253#ifndef __ARCH_HAS_IRIX_SIGACTION
Al Viro574c4862012-11-25 22:24:19 -0500254 __sighandler_t sa_handler;
255 unsigned long sa_flags;
256#else
David Howells2a148692013-03-19 14:00:53 +0000257 unsigned int sa_flags;
Al Viro574c4862012-11-25 22:24:19 -0500258 __sighandler_t sa_handler;
259#endif
260#ifdef __ARCH_HAS_SA_RESTORER
261 __sigrestore_t sa_restorer;
262#endif
263 sigset_t sa_mask; /* mask last for extensibility */
264};
265
Al Viro92a3ce42012-11-25 21:20:05 -0500266struct k_sigaction {
267 struct sigaction sa;
268#ifdef __ARCH_HAS_KA_RESTORER
269 __sigrestore_t ka_restorer;
270#endif
271};
Al Viro495dfbf2012-12-25 19:09:45 -0500272
273#ifdef CONFIG_OLD_SIGACTION
274struct old_sigaction {
275 __sighandler_t sa_handler;
276 old_sigset_t sa_mask;
277 unsigned long sa_flags;
278 __sigrestore_t sa_restorer;
279};
280#endif
Al Viro92a3ce42012-11-25 21:20:05 -0500281
Al Viroca86b5d2012-11-07 15:09:38 -0500282struct ksignal {
283 struct k_sigaction ka;
284 siginfo_t info;
285 int sig;
286};
287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
Al Viro2ce5da12012-11-07 15:11:25 -0500289extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
Al Viroefee9842012-04-28 02:04:15 -0400290extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping);
Oleg Nesterovd12619b2008-02-08 04:19:12 -0800291extern void exit_signals(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Al Viroca86b5d2012-11-07 15:09:38 -0500293/*
294 * Eventually that'll replace get_signal_to_deliver(); macro for now,
295 * to avoid nastiness with include order.
296 */
297#define get_signal(ksig) \
298({ \
299 struct ksignal *p = (ksig); \
300 p->sig = get_signal_to_deliver(&p->info, &p->ka, \
301 signal_pt_regs(), NULL);\
302 p->sig > 0; \
303})
304
Christoph Lameter298ec1e2006-12-06 20:32:47 -0800305extern struct kmem_cache *sighand_cachep;
306
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +0200307int unhandled_signal(struct task_struct *tsk, int sig);
308
Roland McGrath55c0d1f2007-05-09 02:33:37 -0700309/*
310 * In POSIX a signal is sent either to a specific thread (Linux task)
311 * or to the process as a whole (Linux thread group). How the signal
312 * is sent determines whether it's to one thread or the whole group,
313 * which determines which signal mask(s) are involved in blocking it
314 * from being delivered until later. When the signal is delivered,
315 * either it's caught or ignored by a user handler or it has a default
316 * effect that applies to the whole thread group (POSIX process).
317 *
318 * The possible effects an unblocked signal set to SIG_DFL can have are:
319 * ignore - Nothing Happens
320 * terminate - kill the process, i.e. all threads in the group,
321 * similar to exit_group. The group leader (only) reports
322 * WIFSIGNALED status to its parent.
323 * coredump - write a core dump file describing all threads using
324 * the same mm and then kill all those threads
325 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
326 *
327 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
328 * Other signals when not blocked and set to SIG_DFL behaves as follows.
329 * The job control signals also have other special effects.
330 *
331 * +--------------------+------------------+
332 * | POSIX signal | default action |
333 * +--------------------+------------------+
334 * | SIGHUP | terminate |
335 * | SIGINT | terminate |
336 * | SIGQUIT | coredump |
337 * | SIGILL | coredump |
338 * | SIGTRAP | coredump |
339 * | SIGABRT/SIGIOT | coredump |
340 * | SIGBUS | coredump |
341 * | SIGFPE | coredump |
342 * | SIGKILL | terminate(+) |
343 * | SIGUSR1 | terminate |
344 * | SIGSEGV | coredump |
345 * | SIGUSR2 | terminate |
346 * | SIGPIPE | terminate |
347 * | SIGALRM | terminate |
348 * | SIGTERM | terminate |
349 * | SIGCHLD | ignore |
350 * | SIGCONT | ignore(*) |
351 * | SIGSTOP | stop(*)(+) |
352 * | SIGTSTP | stop(*) |
353 * | SIGTTIN | stop(*) |
354 * | SIGTTOU | stop(*) |
355 * | SIGURG | ignore |
356 * | SIGXCPU | coredump |
357 * | SIGXFSZ | coredump |
358 * | SIGVTALRM | terminate |
359 * | SIGPROF | terminate |
360 * | SIGPOLL/SIGIO | terminate |
361 * | SIGSYS/SIGUNUSED | coredump |
362 * | SIGSTKFLT | terminate |
363 * | SIGWINCH | ignore |
364 * | SIGPWR | terminate |
365 * | SIGRTMIN-SIGRTMAX | terminate |
366 * +--------------------+------------------+
367 * | non-POSIX signal | default action |
368 * +--------------------+------------------+
369 * | SIGEMT | coredump |
370 * +--------------------+------------------+
371 *
372 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
373 * (*) Special job control effects:
374 * When SIGCONT is sent, it resumes the process (all threads in the group)
375 * from TASK_STOPPED state and also clears any pending/queued stop signals
376 * (any of those marked with "stop(*)"). This happens regardless of blocking,
377 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
378 * any pending/queued SIGCONT signals; this happens regardless of blocking,
379 * catching, or ignored the stop signal, though (except for SIGSTOP) the
380 * default action of stopping the process may happen later or never.
381 */
382
383#ifdef SIGEMT
384#define SIGEMT_MASK rt_sigmask(SIGEMT)
385#else
386#define SIGEMT_MASK 0
387#endif
388
389#if SIGRTMIN > BITS_PER_LONG
390#define rt_sigmask(sig) (1ULL << ((sig)-1))
391#else
392#define rt_sigmask(sig) sigmask(sig)
393#endif
394#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
395
396#define SIG_KERNEL_ONLY_MASK (\
397 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
398
399#define SIG_KERNEL_STOP_MASK (\
400 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
401 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
402
403#define SIG_KERNEL_COREDUMP_MASK (\
404 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
405 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
406 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
407 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
408 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
409 SIGEMT_MASK )
410
411#define SIG_KERNEL_IGNORE_MASK (\
412 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
413 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
414
415#define sig_kernel_only(sig) \
416 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
417#define sig_kernel_coredump(sig) \
418 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
419#define sig_kernel_ignore(sig) \
420 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
421#define sig_kernel_stop(sig) \
422 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
423
Roland McGrath55c0d1f2007-05-09 02:33:37 -0700424#define sig_user_defined(t, signr) \
425 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
426 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
427
428#define sig_fatal(t, signr) \
429 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
430 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
431
Adrian Bunka1c9eea2008-02-06 01:36:44 -0800432void signals_init(void);
433
Al Viro5c495742012-11-18 15:29:16 -0500434int restore_altstack(const stack_t __user *);
Al Viroc40702c2012-11-20 14:24:26 -0500435int __save_altstack(stack_t __user *, unsigned long);
Al Viro5c495742012-11-18 15:29:16 -0500436
Al Virobd1c149a2013-09-01 20:35:01 +0100437#define save_altstack_ex(uss, sp) do { \
438 stack_t __user *__uss = uss; \
439 struct task_struct *t = current; \
440 put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
441 put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
442 put_user_ex(t->sas_ss_size, &__uss->ss_size); \
443} while (0);
444
David Howells34db8aa2013-04-12 02:29:19 +0100445#ifdef CONFIG_PROC_FS
446struct seq_file;
447extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);
448#endif
449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450#endif /* _LINUX_SIGNAL_H */