Commit | Line | Data |
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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 | ||
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 */ |
68 | ||
71fabd5e GA |
69 | static inline int sigisemptyset(sigset_t *set) |
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]; \ |
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: \ |
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)) |
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: \ |
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); |
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, |
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); |
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 *, |
237 | const struct timespec *); | |
1da177e4 | 238 | extern int sigprocmask(int, sigset_t *, sigset_t *); |
77097ae5 AV |
239 | extern void set_current_blocked(sigset_t *); |
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; |
301 | ||
abd4f750 MAS |
302 | int unhandled_signal(struct task_struct *tsk, int sig); |
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); |
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 */ |