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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SIGNAL_H
2#define _LINUX_SIGNAL_H
3
David Woodhouse7ab2feb2006-04-25 14:55:46 +01004#include <linux/list.h>
David Howells607ca462012-10-13 10:46:48 +01005#include <uapi/linux/signal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
Stephen Rothwell1477fcc2011-05-20 11:11:53 +10007struct task_struct;
8
Dave Youngd33ed522010-03-10 15:23:59 -08009/* for sysctl */
10extern int print_fatal_signals;
Linus Torvalds1da177e2005-04-16 15:20:36 -070011/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * Real Time signals may be queued.
13 */
14
15struct sigqueue {
16 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 int flags;
18 siginfo_t info;
19 struct user_struct *user;
20};
21
22/* flags values. */
23#define SIGQUEUE_PREALLOC 1
24
25struct 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. */
39static 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
48static 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
57static 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
66static inline int sigfindinword(unsigned long word)
67{
68 return ffz(~word);
69}
70
71#endif /* __HAVE_ARCH_SIG_BITOPS */
72
George Anzinger71fabd52006-01-08 01:02:48 -080073static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#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) \
96static 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
Oleg Nesterov702a5072011-04-27 22:01:27 +0200125#define _sig_andn(x,y) ((x) & ~(y))
126_SIG_SET_BINOP(sigandnsets, _sig_andn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128#undef _SIG_SET_BINOP
129#undef _sig_or
130#undef _sig_and
Oleg Nesterov702a5072011-04-27 22:01:27 +0200131#undef _sig_andn
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133#define _SIG_SET_OP(name, op) \
134static 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
155static 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
167static 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
181static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
182{
183 set->sig[0] |= mask;
184}
185
186static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
187{
188 set->sig[0] &= ~mask;
189}
190
191static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
192{
193 return (set->sig[0] & mask) != 0;
194}
195
196static 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
208static 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
222static inline void init_sigpending(struct sigpending *sig)
223{
224 sigemptyset(&sig->signal);
225 INIT_LIST_HEAD(&sig->list);
226}
227
Oleg Nesterov6a14c5c2006-03-28 16:11:18 -0800228extern void flush_sigqueue(struct sigpending *queue);
229
Jesper Juhle5bdd882005-05-01 08:59:13 -0700230/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
231static inline int valid_signal(unsigned long sig)
232{
233 return sig <= _NSIG ? 1 : 0;
234}
235
Oleg Nesterovb2b07e42011-05-18 15:08:03 +0200236struct timespec;
237struct pt_regs;
238
Davide Libenzifba2afa2007-05-10 22:23:13 -0700239extern int next_signal(struct sigpending *pending, sigset_t *mask);
Oleg Nesterov4a30deb2009-09-23 15:57:00 -0700240extern int do_send_sig_info(int sig, struct siginfo *info,
241 struct task_struct *p, bool group);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
243extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
Thomas Gleixner62ab4502009-04-04 21:01:06 +0000244extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
245 siginfo_t *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246extern long do_sigpending(void __user *, unsigned long);
Oleg Nesterov943df142011-04-27 21:44:14 +0200247extern int do_sigtimedwait(const sigset_t *, siginfo_t *,
248 const struct timespec *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249extern int sigprocmask(int, sigset_t *, sigset_t *);
Al Viro77097ae2012-04-27 13:58:59 -0400250extern void set_current_blocked(sigset_t *);
251extern void __set_current_blocked(const sigset_t *);
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +0200252extern int show_unhandled_signals;
Al Viro68f3f162012-05-21 21:42:32 -0400253extern int sigsuspend(sigset_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255extern 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 -0400256extern 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 -0800257extern void exit_signals(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Christoph Lameter298ec1e2006-12-06 20:32:47 -0800259extern struct kmem_cache *sighand_cachep;
260
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +0200261int unhandled_signal(struct task_struct *tsk, int sig);
262
Roland McGrath55c0d1f2007-05-09 02:33:37 -0700263/*
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
Roland McGrath55c0d1f2007-05-09 02:33:37 -0700378#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
Adrian Bunka1c9eea2008-02-06 01:36:44 -0800386void signals_init(void);
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388#endif /* _LINUX_SIGNAL_H */