Root/
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 | struct task_struct; |
11 | |
12 | /* for sysctl */ |
13 | extern int print_fatal_signals; |
14 | /* |
15 | * Real Time signals may be queued. |
16 | */ |
17 | |
18 | struct sigqueue { |
19 | struct list_head list; |
20 | int flags; |
21 | siginfo_t info; |
22 | struct user_struct *user; |
23 | }; |
24 | |
25 | /* flags values. */ |
26 | #define SIGQUEUE_PREALLOC 1 |
27 | |
28 | struct sigpending { |
29 | struct list_head list; |
30 | sigset_t signal; |
31 | }; |
32 | |
33 | /* |
34 | * Define some primitives to manipulate sigset_t. |
35 | */ |
36 | |
37 | #ifndef __HAVE_ARCH_SIG_BITOPS |
38 | #include <linux/bitops.h> |
39 | |
40 | /* We don't use <linux/bitops.h> for these because there is no need to |
41 | be atomic. */ |
42 | static inline void sigaddset(sigset_t *set, int _sig) |
43 | { |
44 | unsigned long sig = _sig - 1; |
45 | if (_NSIG_WORDS == 1) |
46 | set->sig[0] |= 1UL << sig; |
47 | else |
48 | set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW); |
49 | } |
50 | |
51 | static inline void sigdelset(sigset_t *set, int _sig) |
52 | { |
53 | unsigned long sig = _sig - 1; |
54 | if (_NSIG_WORDS == 1) |
55 | set->sig[0] &= ~(1UL << sig); |
56 | else |
57 | set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW)); |
58 | } |
59 | |
60 | static inline int sigismember(sigset_t *set, int _sig) |
61 | { |
62 | unsigned long sig = _sig - 1; |
63 | if (_NSIG_WORDS == 1) |
64 | return 1 & (set->sig[0] >> sig); |
65 | else |
66 | return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW)); |
67 | } |
68 | |
69 | static inline int sigfindinword(unsigned long word) |
70 | { |
71 | return ffz(~word); |
72 | } |
73 | |
74 | #endif /* __HAVE_ARCH_SIG_BITOPS */ |
75 | |
76 | static inline int sigisemptyset(sigset_t *set) |
77 | { |
78 | extern void _NSIG_WORDS_is_unsupported_size(void); |
79 | switch (_NSIG_WORDS) { |
80 | case 4: |
81 | return (set->sig[3] | set->sig[2] | |
82 | set->sig[1] | set->sig[0]) == 0; |
83 | case 2: |
84 | return (set->sig[1] | set->sig[0]) == 0; |
85 | case 1: |
86 | return set->sig[0] == 0; |
87 | default: |
88 | _NSIG_WORDS_is_unsupported_size(); |
89 | return 0; |
90 | } |
91 | } |
92 | |
93 | #define sigmask(sig) (1UL << ((sig) - 1)) |
94 | |
95 | #ifndef __HAVE_ARCH_SIG_SETOPS |
96 | #include <linux/string.h> |
97 | |
98 | #define _SIG_SET_BINOP(name, op) \ |
99 | static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \ |
100 | { \ |
101 | extern void _NSIG_WORDS_is_unsupported_size(void); \ |
102 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \ |
103 | \ |
104 | switch (_NSIG_WORDS) { \ |
105 | case 4: \ |
106 | a3 = a->sig[3]; a2 = a->sig[2]; \ |
107 | b3 = b->sig[3]; b2 = b->sig[2]; \ |
108 | r->sig[3] = op(a3, b3); \ |
109 | r->sig[2] = op(a2, b2); \ |
110 | case 2: \ |
111 | a1 = a->sig[1]; b1 = b->sig[1]; \ |
112 | r->sig[1] = op(a1, b1); \ |
113 | case 1: \ |
114 | a0 = a->sig[0]; b0 = b->sig[0]; \ |
115 | r->sig[0] = op(a0, b0); \ |
116 | break; \ |
117 | default: \ |
118 | _NSIG_WORDS_is_unsupported_size(); \ |
119 | } \ |
120 | } |
121 | |
122 | #define _sig_or(x,y) ((x) | (y)) |
123 | _SIG_SET_BINOP(sigorsets, _sig_or) |
124 | |
125 | #define _sig_and(x,y) ((x) & (y)) |
126 | _SIG_SET_BINOP(sigandsets, _sig_and) |
127 | |
128 | #define _sig_andn(x,y) ((x) & ~(y)) |
129 | _SIG_SET_BINOP(sigandnsets, _sig_andn) |
130 | |
131 | #undef _SIG_SET_BINOP |
132 | #undef _sig_or |
133 | #undef _sig_and |
134 | #undef _sig_andn |
135 | |
136 | #define _SIG_SET_OP(name, op) \ |
137 | static inline void name(sigset_t *set) \ |
138 | { \ |
139 | extern void _NSIG_WORDS_is_unsupported_size(void); \ |
140 | \ |
141 | switch (_NSIG_WORDS) { \ |
142 | case 4: set->sig[3] = op(set->sig[3]); \ |
143 | set->sig[2] = op(set->sig[2]); \ |
144 | case 2: set->sig[1] = op(set->sig[1]); \ |
145 | case 1: set->sig[0] = op(set->sig[0]); \ |
146 | break; \ |
147 | default: \ |
148 | _NSIG_WORDS_is_unsupported_size(); \ |
149 | } \ |
150 | } |
151 | |
152 | #define _sig_not(x) (~(x)) |
153 | _SIG_SET_OP(signotset, _sig_not) |
154 | |
155 | #undef _SIG_SET_OP |
156 | #undef _sig_not |
157 | |
158 | static inline void sigemptyset(sigset_t *set) |
159 | { |
160 | switch (_NSIG_WORDS) { |
161 | default: |
162 | memset(set, 0, sizeof(sigset_t)); |
163 | break; |
164 | case 2: set->sig[1] = 0; |
165 | case 1: set->sig[0] = 0; |
166 | break; |
167 | } |
168 | } |
169 | |
170 | static inline void sigfillset(sigset_t *set) |
171 | { |
172 | switch (_NSIG_WORDS) { |
173 | default: |
174 | memset(set, -1, sizeof(sigset_t)); |
175 | break; |
176 | case 2: set->sig[1] = -1; |
177 | case 1: set->sig[0] = -1; |
178 | break; |
179 | } |
180 | } |
181 | |
182 | /* Some extensions for manipulating the low 32 signals in particular. */ |
183 | |
184 | static inline void sigaddsetmask(sigset_t *set, unsigned long mask) |
185 | { |
186 | set->sig[0] |= mask; |
187 | } |
188 | |
189 | static inline void sigdelsetmask(sigset_t *set, unsigned long mask) |
190 | { |
191 | set->sig[0] &= ~mask; |
192 | } |
193 | |
194 | static inline int sigtestsetmask(sigset_t *set, unsigned long mask) |
195 | { |
196 | return (set->sig[0] & mask) != 0; |
197 | } |
198 | |
199 | static inline void siginitset(sigset_t *set, unsigned long mask) |
200 | { |
201 | set->sig[0] = mask; |
202 | switch (_NSIG_WORDS) { |
203 | default: |
204 | memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1)); |
205 | break; |
206 | case 2: set->sig[1] = 0; |
207 | case 1: ; |
208 | } |
209 | } |
210 | |
211 | static inline void siginitsetinv(sigset_t *set, unsigned long mask) |
212 | { |
213 | set->sig[0] = ~mask; |
214 | switch (_NSIG_WORDS) { |
215 | default: |
216 | memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1)); |
217 | break; |
218 | case 2: set->sig[1] = -1; |
219 | case 1: ; |
220 | } |
221 | } |
222 | |
223 | #endif /* __HAVE_ARCH_SIG_SETOPS */ |
224 | |
225 | static inline void init_sigpending(struct sigpending *sig) |
226 | { |
227 | sigemptyset(&sig->signal); |
228 | INIT_LIST_HEAD(&sig->list); |
229 | } |
230 | |
231 | extern void flush_sigqueue(struct sigpending *queue); |
232 | |
233 | /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ |
234 | static inline int valid_signal(unsigned long sig) |
235 | { |
236 | return sig <= _NSIG ? 1 : 0; |
237 | } |
238 | |
239 | struct timespec; |
240 | struct pt_regs; |
241 | |
242 | extern int next_signal(struct sigpending *pending, sigset_t *mask); |
243 | extern int do_send_sig_info(int sig, struct siginfo *info, |
244 | struct task_struct *p, bool group); |
245 | extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p); |
246 | extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *); |
247 | extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, |
248 | siginfo_t *info); |
249 | extern long do_sigpending(void __user *, unsigned long); |
250 | extern int do_sigtimedwait(const sigset_t *, siginfo_t *, |
251 | const struct timespec *); |
252 | extern int sigprocmask(int, sigset_t *, sigset_t *); |
253 | extern void set_current_blocked(const sigset_t *); |
254 | extern int show_unhandled_signals; |
255 | |
256 | extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie); |
257 | extern void exit_signals(struct task_struct *tsk); |
258 | |
259 | extern struct kmem_cache *sighand_cachep; |
260 | |
261 | int unhandled_signal(struct task_struct *tsk, int sig); |
262 | |
263 | /* |
264 | * In POSIX a signal is sent either to a specific thread (Linux task) |
265 | * or to the process as a whole (Linux thread group). How the signal |
266 | * is sent determines whether it's to one thread or the whole group, |
267 | * which determines which signal mask(s) are involved in blocking it |
268 | * from being delivered until later. When the signal is delivered, |
269 | * either it's caught or ignored by a user handler or it has a default |
270 | * effect that applies to the whole thread group (POSIX process). |
271 | * |
272 | * The possible effects an unblocked signal set to SIG_DFL can have are: |
273 | * ignore - Nothing Happens |
274 | * terminate - kill the process, i.e. all threads in the group, |
275 | * similar to exit_group. The group leader (only) reports |
276 | * WIFSIGNALED status to its parent. |
277 | * coredump - write a core dump file describing all threads using |
278 | * the same mm and then kill all those threads |
279 | * stop - stop all the threads in the group, i.e. TASK_STOPPED state |
280 | * |
281 | * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. |
282 | * Other signals when not blocked and set to SIG_DFL behaves as follows. |
283 | * The job control signals also have other special effects. |
284 | * |
285 | * +--------------------+------------------+ |
286 | * | POSIX signal | default action | |
287 | * +--------------------+------------------+ |
288 | * | SIGHUP | terminate | |
289 | * | SIGINT | terminate | |
290 | * | SIGQUIT | coredump | |
291 | * | SIGILL | coredump | |
292 | * | SIGTRAP | coredump | |
293 | * | SIGABRT/SIGIOT | coredump | |
294 | * | SIGBUS | coredump | |
295 | * | SIGFPE | coredump | |
296 | * | SIGKILL | terminate(+) | |
297 | * | SIGUSR1 | terminate | |
298 | * | SIGSEGV | coredump | |
299 | * | SIGUSR2 | terminate | |
300 | * | SIGPIPE | terminate | |
301 | * | SIGALRM | terminate | |
302 | * | SIGTERM | terminate | |
303 | * | SIGCHLD | ignore | |
304 | * | SIGCONT | ignore(*) | |
305 | * | SIGSTOP | stop(*)(+) | |
306 | * | SIGTSTP | stop(*) | |
307 | * | SIGTTIN | stop(*) | |
308 | * | SIGTTOU | stop(*) | |
309 | * | SIGURG | ignore | |
310 | * | SIGXCPU | coredump | |
311 | * | SIGXFSZ | coredump | |
312 | * | SIGVTALRM | terminate | |
313 | * | SIGPROF | terminate | |
314 | * | SIGPOLL/SIGIO | terminate | |
315 | * | SIGSYS/SIGUNUSED | coredump | |
316 | * | SIGSTKFLT | terminate | |
317 | * | SIGWINCH | ignore | |
318 | * | SIGPWR | terminate | |
319 | * | SIGRTMIN-SIGRTMAX | terminate | |
320 | * +--------------------+------------------+ |
321 | * | non-POSIX signal | default action | |
322 | * +--------------------+------------------+ |
323 | * | SIGEMT | coredump | |
324 | * +--------------------+------------------+ |
325 | * |
326 | * (+) For SIGKILL and SIGSTOP the action is "always", not just "default". |
327 | * (*) Special job control effects: |
328 | * When SIGCONT is sent, it resumes the process (all threads in the group) |
329 | * from TASK_STOPPED state and also clears any pending/queued stop signals |
330 | * (any of those marked with "stop(*)"). This happens regardless of blocking, |
331 | * catching, or ignoring SIGCONT. When any stop signal is sent, it clears |
332 | * any pending/queued SIGCONT signals; this happens regardless of blocking, |
333 | * catching, or ignored the stop signal, though (except for SIGSTOP) the |
334 | * default action of stopping the process may happen later or never. |
335 | */ |
336 | |
337 | #ifdef SIGEMT |
338 | #define SIGEMT_MASK rt_sigmask(SIGEMT) |
339 | #else |
340 | #define SIGEMT_MASK 0 |
341 | #endif |
342 | |
343 | #if SIGRTMIN > BITS_PER_LONG |
344 | #define rt_sigmask(sig) (1ULL << ((sig)-1)) |
345 | #else |
346 | #define rt_sigmask(sig) sigmask(sig) |
347 | #endif |
348 | #define siginmask(sig, mask) (rt_sigmask(sig) & (mask)) |
349 | |
350 | #define SIG_KERNEL_ONLY_MASK (\ |
351 | rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) |
352 | |
353 | #define SIG_KERNEL_STOP_MASK (\ |
354 | rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \ |
355 | rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) ) |
356 | |
357 | #define SIG_KERNEL_COREDUMP_MASK (\ |
358 | rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \ |
359 | rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \ |
360 | rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \ |
361 | rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \ |
362 | rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \ |
363 | SIGEMT_MASK ) |
364 | |
365 | #define SIG_KERNEL_IGNORE_MASK (\ |
366 | rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ |
367 | rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) |
368 | |
369 | #define sig_kernel_only(sig) \ |
370 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK)) |
371 | #define sig_kernel_coredump(sig) \ |
372 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK)) |
373 | #define sig_kernel_ignore(sig) \ |
374 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK)) |
375 | #define sig_kernel_stop(sig) \ |
376 | (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK)) |
377 | |
378 | #define sig_user_defined(t, signr) \ |
379 | (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \ |
380 | ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN)) |
381 | |
382 | #define sig_fatal(t, signr) \ |
383 | (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \ |
384 | (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL) |
385 | |
386 | void signals_init(void); |
387 | |
388 | #endif /* __KERNEL__ */ |
389 | |
390 | #endif /* _LINUX_SIGNAL_H */ |
391 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9