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1da177e4 LT |
1 | #ifndef _LINUX_SIGNAL_H |
2 | #define _LINUX_SIGNAL_H | |
3 | ||
7ab2febd | 4 | #include <linux/list.h> |
607ca46e | 5 | #include <uapi/linux/signal.h> |
1da177e4 | 6 | |
1477fcc2 SR |
7 | struct task_struct; |
8 | ||
d33ed52d DY |
9 | /* for sysctl */ |
10 | extern int print_fatal_signals; | |
1da177e4 LT |
11 | /* |
12 | * Real Time signals may be queued. | |
13 | */ | |
14 | ||
15 | struct sigqueue { | |
16 | struct list_head list; | |
1da177e4 LT |
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 | ||
71fabd5e GA |
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 | ||
1da177e4 LT |
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 | ||
702a5073 ON |
125 | #define _sig_andn(x,y) ((x) & ~(y)) |
126 | _SIG_SET_BINOP(sigandnsets, _sig_andn) | |
1da177e4 LT |
127 | |
128 | #undef _SIG_SET_BINOP | |
129 | #undef _sig_or | |
130 | #undef _sig_and | |
702a5073 | 131 | #undef _sig_andn |
1da177e4 LT |
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 | ||
6a14c5c9 ON |
228 | extern void flush_sigqueue(struct sigpending *queue); |
229 | ||
e5bdd883 JJ |
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 | ||
b2b07e4f ON |
236 | struct timespec; |
237 | struct pt_regs; | |
238 | ||
fba2afaa | 239 | extern int next_signal(struct sigpending *pending, sigset_t *mask); |
4a30debf ON |
240 | extern int do_send_sig_info(int sig, struct siginfo *info, |
241 | struct task_struct *p, bool group); | |
1da177e4 LT |
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 *); | |
943df148 ON |
244 | extern int do_sigtimedwait(const sigset_t *, siginfo_t *, |
245 | const struct timespec *); | |
1da177e4 | 246 | extern int sigprocmask(int, sigset_t *, sigset_t *); |
77097ae5 AV |
247 | extern void set_current_blocked(sigset_t *); |
248 | extern void __set_current_blocked(const sigset_t *); | |
abd4f750 | 249 | extern int show_unhandled_signals; |
68f3f16d | 250 | extern int sigsuspend(sigset_t *); |
1da177e4 | 251 | |
574c4866 AV |
252 | struct sigaction { |
253 | #ifndef __ARCH_HAS_ODD_SIGACTION | |
254 | __sighandler_t sa_handler; | |
255 | unsigned long sa_flags; | |
256 | #else | |
257 | unsigned long 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 | ||
92a3ce4a AV |
266 | struct k_sigaction { |
267 | struct sigaction sa; | |
268 | #ifdef __ARCH_HAS_KA_RESTORER | |
269 | __sigrestore_t ka_restorer; | |
270 | #endif | |
271 | }; | |
272 | ||
1da177e4 | 273 | extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie); |
efee984c | 274 | extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping); |
d12619b5 | 275 | extern void exit_signals(struct task_struct *tsk); |
1da177e4 | 276 | |
298ec1e2 CL |
277 | extern struct kmem_cache *sighand_cachep; |
278 | ||
abd4f750 MAS |
279 | int unhandled_signal(struct task_struct *tsk, int sig); |
280 | ||
55c0d1f8 RM |
281 | /* |
282 | * In POSIX a signal is sent either to a specific thread (Linux task) | |
283 | * or to the process as a whole (Linux thread group). How the signal | |
284 | * is sent determines whether it's to one thread or the whole group, | |
285 | * which determines which signal mask(s) are involved in blocking it | |
286 | * from being delivered until later. When the signal is delivered, | |
287 | * either it's caught or ignored by a user handler or it has a default | |
288 | * effect that applies to the whole thread group (POSIX process). | |
289 | * | |
290 | * The possible effects an unblocked signal set to SIG_DFL can have are: | |
291 | * ignore - Nothing Happens | |
292 | * terminate - kill the process, i.e. all threads in the group, | |
293 | * similar to exit_group. The group leader (only) reports | |
294 | * WIFSIGNALED status to its parent. | |
295 | * coredump - write a core dump file describing all threads using | |
296 | * the same mm and then kill all those threads | |
297 | * stop - stop all the threads in the group, i.e. TASK_STOPPED state | |
298 | * | |
299 | * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. | |
300 | * Other signals when not blocked and set to SIG_DFL behaves as follows. | |
301 | * The job control signals also have other special effects. | |
302 | * | |
303 | * +--------------------+------------------+ | |
304 | * | POSIX signal | default action | | |
305 | * +--------------------+------------------+ | |
306 | * | SIGHUP | terminate | | |
307 | * | SIGINT | terminate | | |
308 | * | SIGQUIT | coredump | | |
309 | * | SIGILL | coredump | | |
310 | * | SIGTRAP | coredump | | |
311 | * | SIGABRT/SIGIOT | coredump | | |
312 | * | SIGBUS | coredump | | |
313 | * | SIGFPE | coredump | | |
314 | * | SIGKILL | terminate(+) | | |
315 | * | SIGUSR1 | terminate | | |
316 | * | SIGSEGV | coredump | | |
317 | * | SIGUSR2 | terminate | | |
318 | * | SIGPIPE | terminate | | |
319 | * | SIGALRM | terminate | | |
320 | * | SIGTERM | terminate | | |
321 | * | SIGCHLD | ignore | | |
322 | * | SIGCONT | ignore(*) | | |
323 | * | SIGSTOP | stop(*)(+) | | |
324 | * | SIGTSTP | stop(*) | | |
325 | * | SIGTTIN | stop(*) | | |
326 | * | SIGTTOU | stop(*) | | |
327 | * | SIGURG | ignore | | |
328 | * | SIGXCPU | coredump | | |
329 | * | SIGXFSZ | coredump | | |
330 | * | SIGVTALRM | terminate | | |
331 | * | SIGPROF | terminate | | |
332 | * | SIGPOLL/SIGIO | terminate | | |
333 | * | SIGSYS/SIGUNUSED | coredump | | |
334 | * | SIGSTKFLT | terminate | | |
335 | * | SIGWINCH | ignore | | |
336 | * | SIGPWR | terminate | | |
337 | * | SIGRTMIN-SIGRTMAX | terminate | | |
338 | * +--------------------+------------------+ | |
339 | * | non-POSIX signal | default action | | |
340 | * +--------------------+------------------+ | |
341 | * | SIGEMT | coredump | | |
342 | * +--------------------+------------------+ | |
343 | * | |
344 | * (+) For SIGKILL and SIGSTOP the action is "always", not just "default". | |
345 | * (*) Special job control effects: | |
346 | * When SIGCONT is sent, it resumes the process (all threads in the group) | |
347 | * from TASK_STOPPED state and also clears any pending/queued stop signals | |
348 | * (any of those marked with "stop(*)"). This happens regardless of blocking, | |
349 | * catching, or ignoring SIGCONT. When any stop signal is sent, it clears | |
350 | * any pending/queued SIGCONT signals; this happens regardless of blocking, | |
351 | * catching, or ignored the stop signal, though (except for SIGSTOP) the | |
352 | * default action of stopping the process may happen later or never. | |
353 | */ | |
354 | ||
355 | #ifdef SIGEMT | |
356 | #define SIGEMT_MASK rt_sigmask(SIGEMT) | |
357 | #else | |
358 | #define SIGEMT_MASK 0 | |
359 | #endif | |
360 | ||
361 | #if SIGRTMIN > BITS_PER_LONG | |
362 | #define rt_sigmask(sig) (1ULL << ((sig)-1)) | |
363 | #else | |
364 | #define rt_sigmask(sig) sigmask(sig) | |
365 | #endif | |
366 | #define siginmask(sig, mask) (rt_sigmask(sig) & (mask)) | |
367 | ||
368 | #define SIG_KERNEL_ONLY_MASK (\ | |
369 | rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) | |
370 | ||
371 | #define SIG_KERNEL_STOP_MASK (\ | |
372 | rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \ | |
373 | rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) ) | |
374 | ||
375 | #define SIG_KERNEL_COREDUMP_MASK (\ | |
376 | rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \ | |
377 | rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \ | |
378 | rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \ | |
379 | rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \ | |
380 | rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \ | |
381 | SIGEMT_MASK ) | |
382 | ||
383 | #define SIG_KERNEL_IGNORE_MASK (\ | |
384 | rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ | |
385 | rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) | |
386 | ||
387 | #define sig_kernel_only(sig) \ | |
388 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK)) | |
389 | #define sig_kernel_coredump(sig) \ | |
390 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK)) | |
391 | #define sig_kernel_ignore(sig) \ | |
392 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK)) | |
393 | #define sig_kernel_stop(sig) \ | |
394 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK)) | |
395 | ||
55c0d1f8 RM |
396 | #define sig_user_defined(t, signr) \ |
397 | (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \ | |
398 | ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN)) | |
399 | ||
400 | #define sig_fatal(t, signr) \ | |
401 | (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \ | |
402 | (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL) | |
403 | ||
a1c9eea9 AB |
404 | void signals_init(void); |
405 | ||
5c49574f | 406 | int restore_altstack(const stack_t __user *); |
c40702c4 | 407 | int __save_altstack(stack_t __user *, unsigned long); |
5c49574f | 408 | |
1da177e4 | 409 | #endif /* _LINUX_SIGNAL_H */ |