Line data Source code
1 : #ifndef _LINUX_SIGNAL_H
2 : #define _LINUX_SIGNAL_H
3 :
4 : #include <asm/signal.h>
5 : #include <asm/siginfo.h>
6 :
7 : #ifdef __KERNEL__
8 : #include <linux/list.h>
9 :
10 : /*
11 : * Real Time signals may be queued.
12 : */
13 :
14 : struct sigqueue {
15 : struct list_head list;
16 : int flags;
17 : siginfo_t info;
18 : struct user_struct *user;
19 : };
20 1 :
21 : /* flags values. */
22 : #define SIGQUEUE_PREALLOC 1
23 :
24 : struct sigpending {
25 : struct list_head list;
26 : sigset_t signal;
27 : };
28 :
29 : /*
30 : * Define some primitives to manipulate sigset_t.
31 : */
32 :
33 : #ifndef __HAVE_ARCH_SIG_BITOPS
34 : #include <linux/bitops.h>
35 :
36 : /* We don't use <linux/bitops.h> for these because there is no need to
37 : be atomic. */
38 : static inline void sigaddset(sigset_t *set, int _sig)
39 : {
40 : unsigned long sig = _sig - 1;
41 : if (_NSIG_WORDS == 1)
42 : set->sig[0] |= 1UL << sig;
43 : else
44 : set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
45 : }
46 :
47 : static inline void sigdelset(sigset_t *set, int _sig)
48 : {
49 : unsigned long sig = _sig - 1;
50 : if (_NSIG_WORDS == 1)
51 : set->sig[0] &= ~(1UL << sig);
52 : else
53 : set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
54 : }
55 :
56 : static inline int sigismember(sigset_t *set, int _sig)
57 : {
58 : unsigned long sig = _sig - 1;
59 : if (_NSIG_WORDS == 1)
60 : return 1 & (set->sig[0] >> sig);
61 : else
62 : return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
63 : }
64 :
65 : static inline int sigfindinword(unsigned long word)
66 : {
67 : return ffz(~word);
68 : }
69 :
70 : #endif /* __HAVE_ARCH_SIG_BITOPS */
71 :
72 : static inline int sigisemptyset(sigset_t *set)
73 : {
74 : extern void _NSIG_WORDS_is_unsupported_size(void);
75 : switch (_NSIG_WORDS) {
76 : case 4:
77 : return (set->sig[3] | set->sig[2] |
78 : set->sig[1] | set->sig[0]) == 0;
79 : case 2:
80 : return (set->sig[1] | set->sig[0]) == 0;
81 : case 1:
82 : return set->sig[0] == 0;
83 : default:
84 : _NSIG_WORDS_is_unsupported_size();
85 : return 0;
86 : }
87 : }
88 :
89 : #define sigmask(sig) (1UL << ((sig) - 1))
90 :
91 : #ifndef __HAVE_ARCH_SIG_SETOPS
92 : #include <linux/string.h>
93 :
94 : #define _SIG_SET_BINOP(name, op) \
95 : static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
96 : { \
97 : extern void _NSIG_WORDS_is_unsupported_size(void); \
98 : unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
99 : \
100 : switch (_NSIG_WORDS) { \
101 : case 4: \
102 : a3 = a->sig[3]; a2 = a->sig[2]; \
103 : b3 = b->sig[3]; b2 = b->sig[2]; \
104 : r->sig[3] = op(a3, b3); \
105 : r->sig[2] = op(a2, b2); \
106 : case 2: \
107 : a1 = a->sig[1]; b1 = b->sig[1]; \
108 : r->sig[1] = op(a1, b1); \
109 : case 1: \
110 : a0 = a->sig[0]; b0 = b->sig[0]; \
111 : r->sig[0] = op(a0, b0); \
112 : break; \
113 : default: \
114 : _NSIG_WORDS_is_unsupported_size(); \
115 : } \
116 : }
117 :
118 : #define _sig_or(x,y) ((x) | (y))
119 : _SIG_SET_BINOP(sigorsets, _sig_or)
120 :
121 : #define _sig_and(x,y) ((x) & (y))
122 : _SIG_SET_BINOP(sigandsets, _sig_and)
123 :
124 : #define _sig_nand(x,y) ((x) & ~(y))
125 : _SIG_SET_BINOP(signandsets, _sig_nand)
126 :
127 : #undef _SIG_SET_BINOP
128 : #undef _sig_or
129 : #undef _sig_and
130 : #undef _sig_nand
131 :
132 : #define _SIG_SET_OP(name, op) \
133 : static inline void name(sigset_t *set) \
134 : { \
135 : extern void _NSIG_WORDS_is_unsupported_size(void); \
136 : \
137 : switch (_NSIG_WORDS) { \
138 : case 4: set->sig[3] = op(set->sig[3]); \
139 : set->sig[2] = op(set->sig[2]); \
140 : case 2: set->sig[1] = op(set->sig[1]); \
141 : case 1: set->sig[0] = op(set->sig[0]); \
142 : break; \
143 : default: \
144 : _NSIG_WORDS_is_unsupported_size(); \
145 : } \
146 : }
147 :
148 : #define _sig_not(x) (~(x))
149 : _SIG_SET_OP(signotset, _sig_not)
150 :
151 : #undef _SIG_SET_OP
152 : #undef _sig_not
153 :
154 : static inline void sigemptyset(sigset_t *set)
155 : {
156 : switch (_NSIG_WORDS) {
157 : default:
158 : memset(set, 0, sizeof(sigset_t));
159 : break;
160 : case 2: set->sig[1] = 0;
161 : case 1: set->sig[0] = 0;
162 : break;
163 : }
164 : }
165 :
166 : static inline void sigfillset(sigset_t *set)
167 : {
168 : switch (_NSIG_WORDS) {
169 : default:
170 : memset(set, -1, sizeof(sigset_t));
171 : break;
172 : case 2: set->sig[1] = -1;
173 : case 1: set->sig[0] = -1;
174 : break;
175 : }
176 : }
177 :
178 : /* Some extensions for manipulating the low 32 signals in particular. */
179 :
180 : static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
181 : {
182 : set->sig[0] |= mask;
183 : }
184 :
185 : static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
186 : {
187 : set->sig[0] &= ~mask;
188 : }
189 :
190 : static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
191 : {
192 : return (set->sig[0] & mask) != 0;
193 : }
194 :
195 : static inline void siginitset(sigset_t *set, unsigned long mask)
196 : {
197 : set->sig[0] = mask;
198 : switch (_NSIG_WORDS) {
199 : default:
200 : memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
201 : break;
202 : case 2: set->sig[1] = 0;
203 : case 1: ;
204 : }
205 : }
206 :
207 : static inline void siginitsetinv(sigset_t *set, unsigned long mask)
208 : {
209 : set->sig[0] = ~mask;
210 : switch (_NSIG_WORDS) {
211 : default:
212 : memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
213 : break;
214 : case 2: set->sig[1] = -1;
215 : case 1: ;
216 : }
217 : }
218 :
219 : #endif /* __HAVE_ARCH_SIG_SETOPS */
220 :
221 : static inline void init_sigpending(struct sigpending *sig)
222 : {
223 : sigemptyset(&sig->signal);
224 : INIT_LIST_HEAD(&sig->list);
225 : }
226 :
227 : extern void flush_sigqueue(struct sigpending *queue);
228 :
229 : /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
230 : static inline int valid_signal(unsigned long sig)
231 : {
232 : return sig <= _NSIG ? 1 : 0;
233 : }
234 :
235 : extern int next_signal(struct sigpending *pending, sigset_t *mask);
236 : extern int do_send_sig_info(int sig, struct siginfo *info,
237 : struct task_struct *p, bool group);
238 : extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
239 : extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
240 : extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
241 : siginfo_t *info);
242 : extern long do_sigpending(void __user *, unsigned long);
243 : extern int sigprocmask(int, sigset_t *, sigset_t *);
244 : extern int show_unhandled_signals;
245 :
246 : struct pt_regs;
247 : extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
248 : extern void exit_signals(struct task_struct *tsk);
249 :
250 : extern struct kmem_cache *sighand_cachep;
251 :
252 : int unhandled_signal(struct task_struct *tsk, int sig);
253 :
254 : /*
255 : * In POSIX a signal is sent either to a specific thread (Linux task)
256 : * or to the process as a whole (Linux thread group). How the signal
257 : * is sent determines whether it's to one thread or the whole group,
258 : * which determines which signal mask(s) are involved in blocking it
259 : * from being delivered until later. When the signal is delivered,
260 : * either it's caught or ignored by a user handler or it has a default
261 : * effect that applies to the whole thread group (POSIX process).
262 : *
263 : * The possible effects an unblocked signal set to SIG_DFL can have are:
264 : * ignore - Nothing Happens
265 : * terminate - kill the process, i.e. all threads in the group,
266 : * similar to exit_group. The group leader (only) reports
267 : * WIFSIGNALED status to its parent.
268 : * coredump - write a core dump file describing all threads using
269 : * the same mm and then kill all those threads
270 : * stop - stop all the threads in the group, i.e. TASK_STOPPED state
271 : *
272 : * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
273 : * Other signals when not blocked and set to SIG_DFL behaves as follows.
274 : * The job control signals also have other special effects.
275 : *
276 : * +--------------------+------------------+
277 : * | POSIX signal | default action |
278 : * +--------------------+------------------+
279 : * | SIGHUP | terminate |
280 : * | SIGINT | terminate |
281 : * | SIGQUIT | coredump |
282 : * | SIGILL | coredump |
283 : * | SIGTRAP | coredump |
284 : * | SIGABRT/SIGIOT | coredump |
285 : * | SIGBUS | coredump |
286 : * | SIGFPE | coredump |
287 : * | SIGKILL | terminate(+) |
288 : * | SIGUSR1 | terminate |
289 : * | SIGSEGV | coredump |
290 : * | SIGUSR2 | terminate |
291 : * | SIGPIPE | terminate |
292 : * | SIGALRM | terminate |
293 : * | SIGTERM | terminate |
294 : * | SIGCHLD | ignore |
295 : * | SIGCONT | ignore(*) |
296 : * | SIGSTOP | stop(*)(+) |
297 : * | SIGTSTP | stop(*) |
298 : * | SIGTTIN | stop(*) |
299 : * | SIGTTOU | stop(*) |
300 : * | SIGURG | ignore |
301 : * | SIGXCPU | coredump |
302 : * | SIGXFSZ | coredump |
303 : * | SIGVTALRM | terminate |
304 : * | SIGPROF | terminate |
305 : * | SIGPOLL/SIGIO | terminate |
306 : * | SIGSYS/SIGUNUSED | coredump |
307 : * | SIGSTKFLT | terminate |
308 : * | SIGWINCH | ignore |
309 : * | SIGPWR | terminate |
310 : * | SIGRTMIN-SIGRTMAX | terminate |
311 : * +--------------------+------------------+
312 : * | non-POSIX signal | default action |
313 : * +--------------------+------------------+
314 : * | SIGEMT | coredump |
315 : * +--------------------+------------------+
316 : *
317 : * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
318 : * (*) Special job control effects:
319 : * When SIGCONT is sent, it resumes the process (all threads in the group)
320 : * from TASK_STOPPED state and also clears any pending/queued stop signals
321 : * (any of those marked with "stop(*)"). This happens regardless of blocking,
322 : * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
323 : * any pending/queued SIGCONT signals; this happens regardless of blocking,
324 : * catching, or ignored the stop signal, though (except for SIGSTOP) the
325 : * default action of stopping the process may happen later or never.
326 : */
327 :
328 : #ifdef SIGEMT
329 : #define SIGEMT_MASK rt_sigmask(SIGEMT)
330 : #else
331 : #define SIGEMT_MASK 0
332 : #endif
333 :
334 : #if SIGRTMIN > BITS_PER_LONG
335 : #define rt_sigmask(sig) (1ULL << ((sig)-1))
336 : #else
337 : #define rt_sigmask(sig) sigmask(sig)
338 : #endif
339 : #define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
340 :
341 : #define SIG_KERNEL_ONLY_MASK (\
342 : rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
343 :
344 : #define SIG_KERNEL_STOP_MASK (\
345 : rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
346 : rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
347 :
348 : #define SIG_KERNEL_COREDUMP_MASK (\
349 : rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
350 : rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
351 : rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
352 : rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
353 : rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
354 : SIGEMT_MASK )
355 :
356 : #define SIG_KERNEL_IGNORE_MASK (\
357 : rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
358 : rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
359 :
360 : #define sig_kernel_only(sig) \
361 : (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
362 : #define sig_kernel_coredump(sig) \
363 : (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
364 : #define sig_kernel_ignore(sig) \
365 : (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
366 : #define sig_kernel_stop(sig) \
367 : (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
368 :
369 : #define sig_user_defined(t, signr) \
370 : (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
371 : ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
372 :
373 : #define sig_fatal(t, signr) \
374 : (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
375 : (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
376 :
377 : void signals_init(void);
378 1 :
379 : #endif /* __KERNEL__ */
380 :
381 : #endif /* _LINUX_SIGNAL_H */
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