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1 | #ifndef _LINUX_SIGNAL_H |
2 | #define _LINUX_SIGNAL_H |
3 | |
4 | #include <linux/list.h> |
5 | #include <uapi/linux/signal.h> |
6 | |
7 | struct task_struct; |
8 | |
9 | /* for sysctl */ |
10 | extern int print_fatal_signals; |
11 | /* |
12 | * Real Time signals may be queued. |
13 | */ |
14 | |
15 | struct sigqueue { |
16 | struct list_head list; |
17 | int flags; |
18 | siginfo_t info; |
19 | struct user_struct *user; |
20 | }; |
21 | |
22 | /* flags values. */ |
23 | #define SIGQUEUE_PREALLOC 1 |
24 | |
25 | struct 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. */ |
39 | static 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 | |
48 | static 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 | |
57 | static 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 | |
66 | static inline int sigfindinword(unsigned long word) |
67 | { |
68 | return ffz(~word); |
69 | } |
70 | |
71 | #endif /* __HAVE_ARCH_SIG_BITOPS */ |
72 | |
73 | static 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 | |
90 | #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) \ |
96 | static 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 | |
125 | #define _sig_andn(x,y) ((x) & ~(y)) |
126 | _SIG_SET_BINOP(sigandnsets, _sig_andn) |
127 | |
128 | #undef _SIG_SET_BINOP |
129 | #undef _sig_or |
130 | #undef _sig_and |
131 | #undef _sig_andn |
132 | |
133 | #define _SIG_SET_OP(name, op) \ |
134 | static 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 | |
155 | static 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 | |
167 | static 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 | |
181 | static inline void sigaddsetmask(sigset_t *set, unsigned long mask) |
182 | { |
183 | set->sig[0] |= mask; |
184 | } |
185 | |
186 | static inline void sigdelsetmask(sigset_t *set, unsigned long mask) |
187 | { |
188 | set->sig[0] &= ~mask; |
189 | } |
190 | |
191 | static inline int sigtestsetmask(sigset_t *set, unsigned long mask) |
192 | { |
193 | return (set->sig[0] & mask) != 0; |
194 | } |
195 | |
196 | static 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 | |
208 | static 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 | |
222 | static inline void init_sigpending(struct sigpending *sig) |
223 | { |
224 | sigemptyset(&sig->signal); |
225 | INIT_LIST_HEAD(&sig->list); |
226 | } |
227 | |
228 | extern void flush_sigqueue(struct sigpending *queue); |
229 | |
230 | /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ |
231 | static inline int valid_signal(unsigned long sig) |
232 | { |
233 | return sig <= _NSIG ? 1 : 0; |
234 | } |
235 | |
236 | struct timespec; |
237 | struct pt_regs; |
238 | |
239 | extern int next_signal(struct sigpending *pending, sigset_t *mask); |
240 | extern int do_send_sig_info(int sig, struct siginfo *info, |
241 | struct task_struct *p, bool group); |
242 | extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p); |
243 | extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *); |
244 | extern int do_sigtimedwait(const sigset_t *, siginfo_t *, |
245 | const struct timespec *); |
246 | extern int sigprocmask(int, sigset_t *, sigset_t *); |
247 | extern void set_current_blocked(sigset_t *); |
248 | extern void __set_current_blocked(const sigset_t *); |
249 | extern int show_unhandled_signals; |
250 | extern int sigsuspend(sigset_t *); |
251 | |
252 | struct sigaction { |
253 | #ifndef __ARCH_HAS_IRIX_SIGACTION |
254 | __sighandler_t sa_handler; |
255 | unsigned long sa_flags; |
256 | #else |
257 | unsigned int sa_flags; |
258 | __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 | |
266 | struct k_sigaction { |
267 | struct sigaction sa; |
268 | #ifdef __ARCH_HAS_KA_RESTORER |
269 | __sigrestore_t ka_restorer; |
270 | #endif |
271 | }; |
272 | |
273 | #ifdef CONFIG_OLD_SIGACTION |
274 | struct 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 |
281 | |
282 | struct ksignal { |
283 | struct k_sigaction ka; |
284 | siginfo_t info; |
285 | int sig; |
286 | }; |
287 | |
288 | extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie); |
289 | extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping); |
290 | extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping); |
291 | extern void exit_signals(struct task_struct *tsk); |
292 | |
293 | /* |
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 | |
305 | extern struct kmem_cache *sighand_cachep; |
306 | |
307 | int unhandled_signal(struct task_struct *tsk, int sig); |
308 | |
309 | /* |
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 | |
424 | #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 | |
432 | void signals_init(void); |
433 | |
434 | int restore_altstack(const stack_t __user *); |
435 | int __save_altstack(stack_t __user *, unsigned long); |
436 | |
437 | #endif /* _LINUX_SIGNAL_H */ |
438 |
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