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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SIGNAL_H
2#define _LINUX_SIGNAL_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <asm/signal.h>
5#include <asm/siginfo.h>
6
7#ifdef __KERNEL__
David Woodhouse7ab2feb2006-04-25 14:55:46 +01008#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
Stephen Rothwell1477fcc2011-05-20 11:11:53 +100010struct task_struct;
11
Dave Youngd33ed522010-03-10 15:23:59 -080012/* for sysctl */
13extern int print_fatal_signals;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 * Real Time signals may be queued.
16 */
17
18struct sigqueue {
19 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 int flags;
21 siginfo_t info;
22 struct user_struct *user;
23};
24
25/* flags values. */
26#define SIGQUEUE_PREALLOC 1
27
28struct 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. */
42static 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
51static 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
60static 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
69static inline int sigfindinword(unsigned long word)
70{
71 return ffz(~word);
72}
73
74#endif /* __HAVE_ARCH_SIG_BITOPS */
75
George Anzinger71fabd52006-01-08 01:02:48 -080076static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070093#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) \
99static 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
Oleg Nesterov702a5072011-04-27 22:01:27 +0200128#define _sig_andn(x,y) ((x) & ~(y))
129_SIG_SET_BINOP(sigandnsets, _sig_andn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131#undef _SIG_SET_BINOP
132#undef _sig_or
133#undef _sig_and
Oleg Nesterov702a5072011-04-27 22:01:27 +0200134#undef _sig_andn
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136#define _SIG_SET_OP(name, op) \
137static 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
158static 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
170static 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
184static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
185{
186 set->sig[0] |= mask;
187}
188
189static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
190{
191 set->sig[0] &= ~mask;
192}
193
194static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
195{
196 return (set->sig[0] & mask) != 0;
197}
198
199static 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
211static 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
225static inline void init_sigpending(struct sigpending *sig)
226{
227 sigemptyset(&sig->signal);
228 INIT_LIST_HEAD(&sig->list);
229}
230
Oleg Nesterov6a14c5c2006-03-28 16:11:18 -0800231extern void flush_sigqueue(struct sigpending *queue);
232
Jesper Juhle5bdd882005-05-01 08:59:13 -0700233/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
234static inline int valid_signal(unsigned long sig)
235{
236 return sig <= _NSIG ? 1 : 0;
237}
238
Oleg Nesterovb2b07e42011-05-18 15:08:03 +0200239struct timespec;
240struct pt_regs;
241
Davide Libenzifba2afa2007-05-10 22:23:13 -0700242extern int next_signal(struct sigpending *pending, sigset_t *mask);
Oleg Nesterov4a30deb2009-09-23 15:57:00 -0700243extern int do_send_sig_info(int sig, struct siginfo *info,
244 struct task_struct *p, bool group);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
246extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
Thomas Gleixner62ab4502009-04-04 21:01:06 +0000247extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
248 siginfo_t *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249extern long do_sigpending(void __user *, unsigned long);
Oleg Nesterov943df142011-04-27 21:44:14 +0200250extern int do_sigtimedwait(const sigset_t *, siginfo_t *,
251 const struct timespec *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252extern int sigprocmask(int, sigset_t *, sigset_t *);
Al Viro77097ae2012-04-27 13:58:59 -0400253extern void set_current_blocked(sigset_t *);
254extern void __set_current_blocked(const sigset_t *);
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +0200255extern int show_unhandled_signals;
Al Viro68f3f162012-05-21 21:42:32 -0400256extern int sigsuspend(sigset_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
Al Viroefee9842012-04-28 02:04:15 -0400259extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping);
Oleg Nesterovd12619b2008-02-08 04:19:12 -0800260extern void exit_signals(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Christoph Lameter298ec1e2006-12-06 20:32:47 -0800262extern struct kmem_cache *sighand_cachep;
263
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +0200264int unhandled_signal(struct task_struct *tsk, int sig);
265
Roland McGrath55c0d1f2007-05-09 02:33:37 -0700266/*
267 * In POSIX a signal is sent either to a specific thread (Linux task)
268 * or to the process as a whole (Linux thread group). How the signal
269 * is sent determines whether it's to one thread or the whole group,
270 * which determines which signal mask(s) are involved in blocking it
271 * from being delivered until later. When the signal is delivered,
272 * either it's caught or ignored by a user handler or it has a default
273 * effect that applies to the whole thread group (POSIX process).
274 *
275 * The possible effects an unblocked signal set to SIG_DFL can have are:
276 * ignore - Nothing Happens
277 * terminate - kill the process, i.e. all threads in the group,
278 * similar to exit_group. The group leader (only) reports
279 * WIFSIGNALED status to its parent.
280 * coredump - write a core dump file describing all threads using
281 * the same mm and then kill all those threads
282 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
283 *
284 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
285 * Other signals when not blocked and set to SIG_DFL behaves as follows.
286 * The job control signals also have other special effects.
287 *
288 * +--------------------+------------------+
289 * | POSIX signal | default action |
290 * +--------------------+------------------+
291 * | SIGHUP | terminate |
292 * | SIGINT | terminate |
293 * | SIGQUIT | coredump |
294 * | SIGILL | coredump |
295 * | SIGTRAP | coredump |
296 * | SIGABRT/SIGIOT | coredump |
297 * | SIGBUS | coredump |
298 * | SIGFPE | coredump |
299 * | SIGKILL | terminate(+) |
300 * | SIGUSR1 | terminate |
301 * | SIGSEGV | coredump |
302 * | SIGUSR2 | terminate |
303 * | SIGPIPE | terminate |
304 * | SIGALRM | terminate |
305 * | SIGTERM | terminate |
306 * | SIGCHLD | ignore |
307 * | SIGCONT | ignore(*) |
308 * | SIGSTOP | stop(*)(+) |
309 * | SIGTSTP | stop(*) |
310 * | SIGTTIN | stop(*) |
311 * | SIGTTOU | stop(*) |
312 * | SIGURG | ignore |
313 * | SIGXCPU | coredump |
314 * | SIGXFSZ | coredump |
315 * | SIGVTALRM | terminate |
316 * | SIGPROF | terminate |
317 * | SIGPOLL/SIGIO | terminate |
318 * | SIGSYS/SIGUNUSED | coredump |
319 * | SIGSTKFLT | terminate |
320 * | SIGWINCH | ignore |
321 * | SIGPWR | terminate |
322 * | SIGRTMIN-SIGRTMAX | terminate |
323 * +--------------------+------------------+
324 * | non-POSIX signal | default action |
325 * +--------------------+------------------+
326 * | SIGEMT | coredump |
327 * +--------------------+------------------+
328 *
329 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
330 * (*) Special job control effects:
331 * When SIGCONT is sent, it resumes the process (all threads in the group)
332 * from TASK_STOPPED state and also clears any pending/queued stop signals
333 * (any of those marked with "stop(*)"). This happens regardless of blocking,
334 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
335 * any pending/queued SIGCONT signals; this happens regardless of blocking,
336 * catching, or ignored the stop signal, though (except for SIGSTOP) the
337 * default action of stopping the process may happen later or never.
338 */
339
340#ifdef SIGEMT
341#define SIGEMT_MASK rt_sigmask(SIGEMT)
342#else
343#define SIGEMT_MASK 0
344#endif
345
346#if SIGRTMIN > BITS_PER_LONG
347#define rt_sigmask(sig) (1ULL << ((sig)-1))
348#else
349#define rt_sigmask(sig) sigmask(sig)
350#endif
351#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
352
353#define SIG_KERNEL_ONLY_MASK (\
354 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
355
356#define SIG_KERNEL_STOP_MASK (\
357 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
358 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
359
360#define SIG_KERNEL_COREDUMP_MASK (\
361 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
362 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
363 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
364 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
365 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
366 SIGEMT_MASK )
367
368#define SIG_KERNEL_IGNORE_MASK (\
369 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
370 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
371
372#define sig_kernel_only(sig) \
373 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
374#define sig_kernel_coredump(sig) \
375 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
376#define sig_kernel_ignore(sig) \
377 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
378#define sig_kernel_stop(sig) \
379 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
380
Roland McGrath55c0d1f2007-05-09 02:33:37 -0700381#define sig_user_defined(t, signr) \
382 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
383 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
384
385#define sig_fatal(t, signr) \
386 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
387 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
388
Adrian Bunka1c9eea2008-02-06 01:36:44 -0800389void signals_init(void);
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391#endif /* __KERNEL__ */
392
393#endif /* _LINUX_SIGNAL_H */