Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
14struct sigqueue {
15 struct list_head list;
16 int flags;
17 siginfo_t info;
18 struct user_struct *user;
19};
20
21/* flags values. */
22#define SIGQUEUE_PREALLOC 1
23
24struct 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. */
38static 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
47static 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
56static 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
65static inline int sigfindinword(unsigned long word)
66{
67 return ffz(~word);
68}
69
70#endif /* __HAVE_ARCH_SIG_BITOPS */
71
72static 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) \
95static 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) \
133static 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
154static 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
166static 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
180static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
181{
182 set->sig[0] |= mask;
183}
184
185static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
186{
187 set->sig[0] &= ~mask;
188}
189
190static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
191{
192 return (set->sig[0] & mask) != 0;
193}
194
195static 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
207static 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
221static inline void init_sigpending(struct sigpending *sig)
222{
223 sigemptyset(&sig->signal);
224 INIT_LIST_HEAD(&sig->list);
225}
226
227extern void flush_sigqueue(struct sigpending *queue);
228
229/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
230static inline int valid_signal(unsigned long sig)
231{
232 return sig <= _NSIG ? 1 : 0;
233}
234
235extern int next_signal(struct sigpending *pending, sigset_t *mask);
236extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
237extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
238extern long do_sigpending(void __user *, unsigned long);
239extern int sigprocmask(int, sigset_t *, sigset_t *);
240extern int show_unhandled_signals;
241
242struct pt_regs;
243extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
244
245extern struct kmem_cache *sighand_cachep;
246
247int unhandled_signal(struct task_struct *tsk, int sig);
248
249/*
250 * In POSIX a signal is sent either to a specific thread (Linux task)
251 * or to the process as a whole (Linux thread group). How the signal
252 * is sent determines whether it's to one thread or the whole group,
253 * which determines which signal mask(s) are involved in blocking it
254 * from being delivered until later. When the signal is delivered,
255 * either it's caught or ignored by a user handler or it has a default
256 * effect that applies to the whole thread group (POSIX process).
257 *
258 * The possible effects an unblocked signal set to SIG_DFL can have are:
259 * ignore - Nothing Happens
260 * terminate - kill the process, i.e. all threads in the group,
261 * similar to exit_group. The group leader (only) reports
262 * WIFSIGNALED status to its parent.
263 * coredump - write a core dump file describing all threads using
264 * the same mm and then kill all those threads
265 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
266 *
267 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
268 * Other signals when not blocked and set to SIG_DFL behaves as follows.
269 * The job control signals also have other special effects.
270 *
271 * +--------------------+------------------+
272 * | POSIX signal | default action |
273 * +--------------------+------------------+
274 * | SIGHUP | terminate |
275 * | SIGINT | terminate |
276 * | SIGQUIT | coredump |
277 * | SIGILL | coredump |
278 * | SIGTRAP | coredump |
279 * | SIGABRT/SIGIOT | coredump |
280 * | SIGBUS | coredump |
281 * | SIGFPE | coredump |
282 * | SIGKILL | terminate(+) |
283 * | SIGUSR1 | terminate |
284 * | SIGSEGV | coredump |
285 * | SIGUSR2 | terminate |
286 * | SIGPIPE | terminate |
287 * | SIGALRM | terminate |
288 * | SIGTERM | terminate |
289 * | SIGCHLD | ignore |
290 * | SIGCONT | ignore(*) |
291 * | SIGSTOP | stop(*)(+) |
292 * | SIGTSTP | stop(*) |
293 * | SIGTTIN | stop(*) |
294 * | SIGTTOU | stop(*) |
295 * | SIGURG | ignore |
296 * | SIGXCPU | coredump |
297 * | SIGXFSZ | coredump |
298 * | SIGVTALRM | terminate |
299 * | SIGPROF | terminate |
300 * | SIGPOLL/SIGIO | terminate |
301 * | SIGSYS/SIGUNUSED | coredump |
302 * | SIGSTKFLT | terminate |
303 * | SIGWINCH | ignore |
304 * | SIGPWR | terminate |
305 * | SIGRTMIN-SIGRTMAX | terminate |
306 * +--------------------+------------------+
307 * | non-POSIX signal | default action |
308 * +--------------------+------------------+
309 * | SIGEMT | coredump |
310 * +--------------------+------------------+
311 *
312 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
313 * (*) Special job control effects:
314 * When SIGCONT is sent, it resumes the process (all threads in the group)
315 * from TASK_STOPPED state and also clears any pending/queued stop signals
316 * (any of those marked with "stop(*)"). This happens regardless of blocking,
317 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
318 * any pending/queued SIGCONT signals; this happens regardless of blocking,
319 * catching, or ignored the stop signal, though (except for SIGSTOP) the
320 * default action of stopping the process may happen later or never.
321 */
322
323#ifdef SIGEMT
324#define SIGEMT_MASK rt_sigmask(SIGEMT)
325#else
326#define SIGEMT_MASK 0
327#endif
328
329#if SIGRTMIN > BITS_PER_LONG
330#define rt_sigmask(sig) (1ULL << ((sig)-1))
331#else
332#define rt_sigmask(sig) sigmask(sig)
333#endif
334#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
335
336#define SIG_KERNEL_ONLY_MASK (\
337 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
338
339#define SIG_KERNEL_STOP_MASK (\
340 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
341 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
342
343#define SIG_KERNEL_COREDUMP_MASK (\
344 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
345 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
346 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
347 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
348 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
349 SIGEMT_MASK )
350
351#define SIG_KERNEL_IGNORE_MASK (\
352 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
353 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
354
355#define sig_kernel_only(sig) \
356 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
357#define sig_kernel_coredump(sig) \
358 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
359#define sig_kernel_ignore(sig) \
360 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
361#define sig_kernel_stop(sig) \
362 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
363
364#define sig_needs_tasklist(sig) ((sig) == SIGCONT)
365
366#define sig_user_defined(t, signr) \
367 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
368 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
369
370#define sig_fatal(t, signr) \
371 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
372 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
373
374#endif /* __KERNEL__ */
375
376#endif /* _LINUX_SIGNAL_H */