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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; |
9 | ||
d33ed52d DY |
10 | /* for sysctl */ |
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 | ||
ca9eb49a JH |
31 | #ifndef HAVE_ARCH_COPY_SIGINFO |
32 | ||
33 | #include <linux/string.h> | |
34 | ||
35 | static inline void copy_siginfo(struct siginfo *to, struct siginfo *from) | |
36 | { | |
37 | if (from->si_code < 0) | |
38 | memcpy(to, from, sizeof(*to)); | |
39 | else | |
40 | /* _sigchld is currently the largest know union member */ | |
41 | memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld)); | |
42 | } | |
43 | ||
44 | #endif | |
45 | ||
1da177e4 LT |
46 | /* |
47 | * Define some primitives to manipulate sigset_t. | |
48 | */ | |
49 | ||
50 | #ifndef __HAVE_ARCH_SIG_BITOPS | |
51 | #include <linux/bitops.h> | |
52 | ||
53 | /* We don't use <linux/bitops.h> for these because there is no need to | |
54 | be atomic. */ | |
55 | static inline void sigaddset(sigset_t *set, int _sig) | |
56 | { | |
57 | unsigned long sig = _sig - 1; | |
58 | if (_NSIG_WORDS == 1) | |
59 | set->sig[0] |= 1UL << sig; | |
60 | else | |
61 | set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW); | |
62 | } | |
63 | ||
64 | static inline void sigdelset(sigset_t *set, int _sig) | |
65 | { | |
66 | unsigned long sig = _sig - 1; | |
67 | if (_NSIG_WORDS == 1) | |
68 | set->sig[0] &= ~(1UL << sig); | |
69 | else | |
70 | set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW)); | |
71 | } | |
72 | ||
73 | static inline int sigismember(sigset_t *set, int _sig) | |
74 | { | |
75 | unsigned long sig = _sig - 1; | |
76 | if (_NSIG_WORDS == 1) | |
77 | return 1 & (set->sig[0] >> sig); | |
78 | else | |
79 | return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW)); | |
80 | } | |
81 | ||
1da177e4 LT |
82 | #endif /* __HAVE_ARCH_SIG_BITOPS */ |
83 | ||
71fabd5e GA |
84 | static inline int sigisemptyset(sigset_t *set) |
85 | { | |
71fabd5e GA |
86 | switch (_NSIG_WORDS) { |
87 | case 4: | |
88 | return (set->sig[3] | set->sig[2] | | |
89 | set->sig[1] | set->sig[0]) == 0; | |
90 | case 2: | |
91 | return (set->sig[1] | set->sig[0]) == 0; | |
92 | case 1: | |
93 | return set->sig[0] == 0; | |
94 | default: | |
1c3bea0e | 95 | BUILD_BUG(); |
71fabd5e GA |
96 | return 0; |
97 | } | |
98 | } | |
99 | ||
c7be96af WL |
100 | static inline int sigequalsets(const sigset_t *set1, const sigset_t *set2) |
101 | { | |
102 | switch (_NSIG_WORDS) { | |
103 | case 4: | |
104 | return (set1->sig[3] == set2->sig[3]) && | |
105 | (set1->sig[2] == set2->sig[2]) && | |
106 | (set1->sig[1] == set2->sig[1]) && | |
107 | (set1->sig[0] == set2->sig[0]); | |
108 | case 2: | |
109 | return (set1->sig[1] == set2->sig[1]) && | |
110 | (set1->sig[0] == set2->sig[0]); | |
111 | case 1: | |
112 | return set1->sig[0] == set2->sig[0]; | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
1da177e4 LT |
117 | #define sigmask(sig) (1UL << ((sig) - 1)) |
118 | ||
119 | #ifndef __HAVE_ARCH_SIG_SETOPS | |
120 | #include <linux/string.h> | |
121 | ||
122 | #define _SIG_SET_BINOP(name, op) \ | |
123 | static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \ | |
124 | { \ | |
1da177e4 LT |
125 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \ |
126 | \ | |
127 | switch (_NSIG_WORDS) { \ | |
1c3bea0e | 128 | case 4: \ |
1da177e4 LT |
129 | a3 = a->sig[3]; a2 = a->sig[2]; \ |
130 | b3 = b->sig[3]; b2 = b->sig[2]; \ | |
131 | r->sig[3] = op(a3, b3); \ | |
132 | r->sig[2] = op(a2, b2); \ | |
1c3bea0e | 133 | case 2: \ |
1da177e4 LT |
134 | a1 = a->sig[1]; b1 = b->sig[1]; \ |
135 | r->sig[1] = op(a1, b1); \ | |
1c3bea0e | 136 | case 1: \ |
1da177e4 LT |
137 | a0 = a->sig[0]; b0 = b->sig[0]; \ |
138 | r->sig[0] = op(a0, b0); \ | |
139 | break; \ | |
1c3bea0e ON |
140 | default: \ |
141 | BUILD_BUG(); \ | |
1da177e4 LT |
142 | } \ |
143 | } | |
144 | ||
145 | #define _sig_or(x,y) ((x) | (y)) | |
146 | _SIG_SET_BINOP(sigorsets, _sig_or) | |
147 | ||
148 | #define _sig_and(x,y) ((x) & (y)) | |
149 | _SIG_SET_BINOP(sigandsets, _sig_and) | |
150 | ||
702a5073 ON |
151 | #define _sig_andn(x,y) ((x) & ~(y)) |
152 | _SIG_SET_BINOP(sigandnsets, _sig_andn) | |
1da177e4 LT |
153 | |
154 | #undef _SIG_SET_BINOP | |
155 | #undef _sig_or | |
156 | #undef _sig_and | |
702a5073 | 157 | #undef _sig_andn |
1da177e4 LT |
158 | |
159 | #define _SIG_SET_OP(name, op) \ | |
160 | static inline void name(sigset_t *set) \ | |
161 | { \ | |
1da177e4 | 162 | switch (_NSIG_WORDS) { \ |
1c3bea0e ON |
163 | case 4: set->sig[3] = op(set->sig[3]); \ |
164 | set->sig[2] = op(set->sig[2]); \ | |
165 | case 2: set->sig[1] = op(set->sig[1]); \ | |
166 | case 1: set->sig[0] = op(set->sig[0]); \ | |
1da177e4 | 167 | break; \ |
1c3bea0e ON |
168 | default: \ |
169 | BUILD_BUG(); \ | |
1da177e4 LT |
170 | } \ |
171 | } | |
172 | ||
173 | #define _sig_not(x) (~(x)) | |
174 | _SIG_SET_OP(signotset, _sig_not) | |
175 | ||
176 | #undef _SIG_SET_OP | |
177 | #undef _sig_not | |
178 | ||
179 | static inline void sigemptyset(sigset_t *set) | |
180 | { | |
181 | switch (_NSIG_WORDS) { | |
182 | default: | |
183 | memset(set, 0, sizeof(sigset_t)); | |
184 | break; | |
185 | case 2: set->sig[1] = 0; | |
186 | case 1: set->sig[0] = 0; | |
187 | break; | |
188 | } | |
189 | } | |
190 | ||
191 | static inline void sigfillset(sigset_t *set) | |
192 | { | |
193 | switch (_NSIG_WORDS) { | |
194 | default: | |
195 | memset(set, -1, sizeof(sigset_t)); | |
196 | break; | |
197 | case 2: set->sig[1] = -1; | |
198 | case 1: set->sig[0] = -1; | |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
203 | /* Some extensions for manipulating the low 32 signals in particular. */ | |
204 | ||
205 | static inline void sigaddsetmask(sigset_t *set, unsigned long mask) | |
206 | { | |
207 | set->sig[0] |= mask; | |
208 | } | |
209 | ||
210 | static inline void sigdelsetmask(sigset_t *set, unsigned long mask) | |
211 | { | |
212 | set->sig[0] &= ~mask; | |
213 | } | |
214 | ||
215 | static inline int sigtestsetmask(sigset_t *set, unsigned long mask) | |
216 | { | |
217 | return (set->sig[0] & mask) != 0; | |
218 | } | |
219 | ||
220 | static inline void siginitset(sigset_t *set, unsigned long mask) | |
221 | { | |
222 | set->sig[0] = mask; | |
223 | switch (_NSIG_WORDS) { | |
224 | default: | |
225 | memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1)); | |
226 | break; | |
227 | case 2: set->sig[1] = 0; | |
228 | case 1: ; | |
229 | } | |
230 | } | |
231 | ||
232 | static inline void siginitsetinv(sigset_t *set, unsigned long mask) | |
233 | { | |
234 | set->sig[0] = ~mask; | |
235 | switch (_NSIG_WORDS) { | |
236 | default: | |
237 | memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1)); | |
238 | break; | |
239 | case 2: set->sig[1] = -1; | |
240 | case 1: ; | |
241 | } | |
242 | } | |
243 | ||
244 | #endif /* __HAVE_ARCH_SIG_SETOPS */ | |
245 | ||
246 | static inline void init_sigpending(struct sigpending *sig) | |
247 | { | |
248 | sigemptyset(&sig->signal); | |
249 | INIT_LIST_HEAD(&sig->list); | |
250 | } | |
251 | ||
6a14c5c9 ON |
252 | extern void flush_sigqueue(struct sigpending *queue); |
253 | ||
e5bdd883 JJ |
254 | /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ |
255 | static inline int valid_signal(unsigned long sig) | |
256 | { | |
257 | return sig <= _NSIG ? 1 : 0; | |
258 | } | |
259 | ||
b2b07e4f ON |
260 | struct timespec; |
261 | struct pt_regs; | |
262 | ||
fba2afaa | 263 | extern int next_signal(struct sigpending *pending, sigset_t *mask); |
4a30debf ON |
264 | extern int do_send_sig_info(int sig, struct siginfo *info, |
265 | struct task_struct *p, bool group); | |
1da177e4 LT |
266 | extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p); |
267 | extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *); | |
943df148 ON |
268 | extern int do_sigtimedwait(const sigset_t *, siginfo_t *, |
269 | const struct timespec *); | |
1da177e4 | 270 | extern int sigprocmask(int, sigset_t *, sigset_t *); |
77097ae5 AV |
271 | extern void set_current_blocked(sigset_t *); |
272 | extern void __set_current_blocked(const sigset_t *); | |
abd4f750 | 273 | extern int show_unhandled_signals; |
1da177e4 | 274 | |
574c4866 | 275 | struct sigaction { |
2a148698 | 276 | #ifndef __ARCH_HAS_IRIX_SIGACTION |
574c4866 AV |
277 | __sighandler_t sa_handler; |
278 | unsigned long sa_flags; | |
279 | #else | |
2a148698 | 280 | unsigned int sa_flags; |
574c4866 AV |
281 | __sighandler_t sa_handler; |
282 | #endif | |
283 | #ifdef __ARCH_HAS_SA_RESTORER | |
284 | __sigrestore_t sa_restorer; | |
285 | #endif | |
286 | sigset_t sa_mask; /* mask last for extensibility */ | |
287 | }; | |
288 | ||
92a3ce4a AV |
289 | struct k_sigaction { |
290 | struct sigaction sa; | |
291 | #ifdef __ARCH_HAS_KA_RESTORER | |
292 | __sigrestore_t ka_restorer; | |
293 | #endif | |
294 | }; | |
495dfbf7 AV |
295 | |
296 | #ifdef CONFIG_OLD_SIGACTION | |
297 | struct old_sigaction { | |
298 | __sighandler_t sa_handler; | |
299 | old_sigset_t sa_mask; | |
300 | unsigned long sa_flags; | |
301 | __sigrestore_t sa_restorer; | |
302 | }; | |
303 | #endif | |
92a3ce4a | 304 | |
ca86b5dc AV |
305 | struct ksignal { |
306 | struct k_sigaction ka; | |
307 | siginfo_t info; | |
308 | int sig; | |
309 | }; | |
310 | ||
828b1f65 | 311 | extern int get_signal(struct ksignal *ksig); |
2ce5da17 | 312 | extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping); |
d12619b5 | 313 | extern void exit_signals(struct task_struct *tsk); |
b4e74264 ON |
314 | extern void kernel_sigaction(int, __sighandler_t); |
315 | ||
316 | static inline void allow_signal(int sig) | |
317 | { | |
318 | /* | |
319 | * Kernel threads handle their own signals. Let the signal code | |
320 | * know it'll be handled, so that they don't get converted to | |
321 | * SIGKILL or just silently dropped. | |
322 | */ | |
323 | kernel_sigaction(sig, (__force __sighandler_t)2); | |
324 | } | |
325 | ||
326 | static inline void disallow_signal(int sig) | |
327 | { | |
328 | kernel_sigaction(sig, SIG_IGN); | |
329 | } | |
1da177e4 | 330 | |
298ec1e2 CL |
331 | extern struct kmem_cache *sighand_cachep; |
332 | ||
abd4f750 MAS |
333 | int unhandled_signal(struct task_struct *tsk, int sig); |
334 | ||
55c0d1f8 RM |
335 | /* |
336 | * In POSIX a signal is sent either to a specific thread (Linux task) | |
337 | * or to the process as a whole (Linux thread group). How the signal | |
338 | * is sent determines whether it's to one thread or the whole group, | |
339 | * which determines which signal mask(s) are involved in blocking it | |
340 | * from being delivered until later. When the signal is delivered, | |
341 | * either it's caught or ignored by a user handler or it has a default | |
342 | * effect that applies to the whole thread group (POSIX process). | |
343 | * | |
344 | * The possible effects an unblocked signal set to SIG_DFL can have are: | |
345 | * ignore - Nothing Happens | |
346 | * terminate - kill the process, i.e. all threads in the group, | |
347 | * similar to exit_group. The group leader (only) reports | |
348 | * WIFSIGNALED status to its parent. | |
349 | * coredump - write a core dump file describing all threads using | |
350 | * the same mm and then kill all those threads | |
351 | * stop - stop all the threads in the group, i.e. TASK_STOPPED state | |
352 | * | |
353 | * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. | |
354 | * Other signals when not blocked and set to SIG_DFL behaves as follows. | |
355 | * The job control signals also have other special effects. | |
356 | * | |
357 | * +--------------------+------------------+ | |
358 | * | POSIX signal | default action | | |
359 | * +--------------------+------------------+ | |
360 | * | SIGHUP | terminate | | |
361 | * | SIGINT | terminate | | |
362 | * | SIGQUIT | coredump | | |
363 | * | SIGILL | coredump | | |
364 | * | SIGTRAP | coredump | | |
365 | * | SIGABRT/SIGIOT | coredump | | |
366 | * | SIGBUS | coredump | | |
367 | * | SIGFPE | coredump | | |
368 | * | SIGKILL | terminate(+) | | |
369 | * | SIGUSR1 | terminate | | |
370 | * | SIGSEGV | coredump | | |
371 | * | SIGUSR2 | terminate | | |
372 | * | SIGPIPE | terminate | | |
373 | * | SIGALRM | terminate | | |
374 | * | SIGTERM | terminate | | |
375 | * | SIGCHLD | ignore | | |
376 | * | SIGCONT | ignore(*) | | |
377 | * | SIGSTOP | stop(*)(+) | | |
378 | * | SIGTSTP | stop(*) | | |
379 | * | SIGTTIN | stop(*) | | |
380 | * | SIGTTOU | stop(*) | | |
381 | * | SIGURG | ignore | | |
382 | * | SIGXCPU | coredump | | |
383 | * | SIGXFSZ | coredump | | |
384 | * | SIGVTALRM | terminate | | |
385 | * | SIGPROF | terminate | | |
386 | * | SIGPOLL/SIGIO | terminate | | |
387 | * | SIGSYS/SIGUNUSED | coredump | | |
388 | * | SIGSTKFLT | terminate | | |
389 | * | SIGWINCH | ignore | | |
390 | * | SIGPWR | terminate | | |
391 | * | SIGRTMIN-SIGRTMAX | terminate | | |
392 | * +--------------------+------------------+ | |
393 | * | non-POSIX signal | default action | | |
394 | * +--------------------+------------------+ | |
395 | * | SIGEMT | coredump | | |
396 | * +--------------------+------------------+ | |
397 | * | |
398 | * (+) For SIGKILL and SIGSTOP the action is "always", not just "default". | |
399 | * (*) Special job control effects: | |
400 | * When SIGCONT is sent, it resumes the process (all threads in the group) | |
401 | * from TASK_STOPPED state and also clears any pending/queued stop signals | |
402 | * (any of those marked with "stop(*)"). This happens regardless of blocking, | |
403 | * catching, or ignoring SIGCONT. When any stop signal is sent, it clears | |
404 | * any pending/queued SIGCONT signals; this happens regardless of blocking, | |
405 | * catching, or ignored the stop signal, though (except for SIGSTOP) the | |
406 | * default action of stopping the process may happen later or never. | |
407 | */ | |
408 | ||
409 | #ifdef SIGEMT | |
410 | #define SIGEMT_MASK rt_sigmask(SIGEMT) | |
411 | #else | |
412 | #define SIGEMT_MASK 0 | |
413 | #endif | |
414 | ||
415 | #if SIGRTMIN > BITS_PER_LONG | |
416 | #define rt_sigmask(sig) (1ULL << ((sig)-1)) | |
417 | #else | |
418 | #define rt_sigmask(sig) sigmask(sig) | |
419 | #endif | |
5c8ccefd ON |
420 | |
421 | #define siginmask(sig, mask) \ | |
422 | ((sig) < SIGRTMIN && (rt_sigmask(sig) & (mask))) | |
55c0d1f8 RM |
423 | |
424 | #define SIG_KERNEL_ONLY_MASK (\ | |
425 | rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) | |
426 | ||
427 | #define SIG_KERNEL_STOP_MASK (\ | |
428 | rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \ | |
429 | rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) ) | |
430 | ||
431 | #define SIG_KERNEL_COREDUMP_MASK (\ | |
432 | rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \ | |
433 | rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \ | |
434 | rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \ | |
435 | rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \ | |
436 | rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \ | |
437 | SIGEMT_MASK ) | |
438 | ||
439 | #define SIG_KERNEL_IGNORE_MASK (\ | |
440 | rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ | |
441 | rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) | |
442 | ||
5c8ccefd ON |
443 | #define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK) |
444 | #define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK) | |
445 | #define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK) | |
446 | #define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK) | |
55c0d1f8 | 447 | |
55c0d1f8 RM |
448 | #define sig_user_defined(t, signr) \ |
449 | (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \ | |
450 | ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN)) | |
451 | ||
452 | #define sig_fatal(t, signr) \ | |
453 | (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \ | |
454 | (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL) | |
455 | ||
a1c9eea9 AB |
456 | void signals_init(void); |
457 | ||
5c49574f | 458 | int restore_altstack(const stack_t __user *); |
c40702c4 | 459 | int __save_altstack(stack_t __user *, unsigned long); |
5c49574f | 460 | |
bd1c149a AV |
461 | #define save_altstack_ex(uss, sp) do { \ |
462 | stack_t __user *__uss = uss; \ | |
463 | struct task_struct *t = current; \ | |
464 | put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \ | |
2a742138 | 465 | put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \ |
bd1c149a | 466 | put_user_ex(t->sas_ss_size, &__uss->ss_size); \ |
2a742138 SS |
467 | if (t->sas_ss_flags & SS_AUTODISARM) \ |
468 | sas_ss_reset(t); \ | |
bd1c149a AV |
469 | } while (0); |
470 | ||
34db8aaf DH |
471 | #ifdef CONFIG_PROC_FS |
472 | struct seq_file; | |
473 | extern void render_sigset_t(struct seq_file *, const char *, sigset_t *); | |
474 | #endif | |
475 | ||
1da177e4 | 476 | #endif /* _LINUX_SIGNAL_H */ |