1 #ifndef _LINUX_SIGNAL_H
2 #define _LINUX_SIGNAL_H
4 #include <linux/list.h>
6 #include <uapi/linux/signal.h>
11 extern int print_fatal_signals;
13 * Real Time signals may be queued.
17 struct list_head list;
20 struct user_struct *user;
24 #define SIGQUEUE_PREALLOC 1
27 struct list_head list;
31 #ifndef HAVE_ARCH_COPY_SIGINFO
33 #include <linux/string.h>
35 static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
37 if (from->si_code < 0)
38 memcpy(to, from, sizeof(*to));
40 /* _sigchld is currently the largest know union member */
41 memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
47 * Define some primitives to manipulate sigset_t.
50 #ifndef __HAVE_ARCH_SIG_BITOPS
51 #include <linux/bitops.h>
53 /* We don't use <linux/bitops.h> for these because there is no need to
55 static inline void sigaddset(sigset_t *set, int _sig)
57 unsigned long sig = _sig - 1;
59 set->sig[0] |= 1UL << sig;
61 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
64 static inline void sigdelset(sigset_t *set, int _sig)
66 unsigned long sig = _sig - 1;
68 set->sig[0] &= ~(1UL << sig);
70 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
73 static inline int sigismember(sigset_t *set, int _sig)
75 unsigned long sig = _sig - 1;
77 return 1 & (set->sig[0] >> sig);
79 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
82 #endif /* __HAVE_ARCH_SIG_BITOPS */
84 static inline int sigisemptyset(sigset_t *set)
86 switch (_NSIG_WORDS) {
88 return (set->sig[3] | set->sig[2] |
89 set->sig[1] | set->sig[0]) == 0;
91 return (set->sig[1] | set->sig[0]) == 0;
93 return set->sig[0] == 0;
100 static inline int sigequalsets(const sigset_t *set1, const sigset_t *set2)
102 switch (_NSIG_WORDS) {
104 return (set1->sig[3] == set2->sig[3]) &&
105 (set1->sig[2] == set2->sig[2]) &&
106 (set1->sig[1] == set2->sig[1]) &&
107 (set1->sig[0] == set2->sig[0]);
109 return (set1->sig[1] == set2->sig[1]) &&
110 (set1->sig[0] == set2->sig[0]);
112 return set1->sig[0] == set2->sig[0];
117 #define sigmask(sig) (1UL << ((sig) - 1))
119 #ifndef __HAVE_ARCH_SIG_SETOPS
120 #include <linux/string.h>
122 #define _SIG_SET_BINOP(name, op) \
123 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
125 unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
127 switch (_NSIG_WORDS) { \
129 a3 = a->sig[3]; a2 = a->sig[2]; \
130 b3 = b->sig[3]; b2 = b->sig[2]; \
131 r->sig[3] = op(a3, b3); \
132 r->sig[2] = op(a2, b2); \
134 a1 = a->sig[1]; b1 = b->sig[1]; \
135 r->sig[1] = op(a1, b1); \
137 a0 = a->sig[0]; b0 = b->sig[0]; \
138 r->sig[0] = op(a0, b0); \
145 #define _sig_or(x,y) ((x) | (y))
146 _SIG_SET_BINOP(sigorsets, _sig_or)
148 #define _sig_and(x,y) ((x) & (y))
149 _SIG_SET_BINOP(sigandsets, _sig_and)
151 #define _sig_andn(x,y) ((x) & ~(y))
152 _SIG_SET_BINOP(sigandnsets, _sig_andn)
154 #undef _SIG_SET_BINOP
159 #define _SIG_SET_OP(name, op) \
160 static inline void name(sigset_t *set) \
162 switch (_NSIG_WORDS) { \
163 case 4: set->sig[3] = op(set->sig[3]); \
164 set->sig[2] = op(set->sig[2]); \
165 case 2: set->sig[1] = op(set->sig[1]); \
166 case 1: set->sig[0] = op(set->sig[0]); \
173 #define _sig_not(x) (~(x))
174 _SIG_SET_OP(signotset, _sig_not)
179 static inline void sigemptyset(sigset_t *set)
181 switch (_NSIG_WORDS) {
183 memset(set, 0, sizeof(sigset_t));
185 case 2: set->sig[1] = 0;
186 case 1: set->sig[0] = 0;
191 static inline void sigfillset(sigset_t *set)
193 switch (_NSIG_WORDS) {
195 memset(set, -1, sizeof(sigset_t));
197 case 2: set->sig[1] = -1;
198 case 1: set->sig[0] = -1;
203 /* Some extensions for manipulating the low 32 signals in particular. */
205 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
210 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
212 set->sig[0] &= ~mask;
215 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
217 return (set->sig[0] & mask) != 0;
220 static inline void siginitset(sigset_t *set, unsigned long mask)
223 switch (_NSIG_WORDS) {
225 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
227 case 2: set->sig[1] = 0;
232 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
235 switch (_NSIG_WORDS) {
237 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
239 case 2: set->sig[1] = -1;
244 #endif /* __HAVE_ARCH_SIG_SETOPS */
246 static inline void init_sigpending(struct sigpending *sig)
248 sigemptyset(&sig->signal);
249 INIT_LIST_HEAD(&sig->list);
252 extern void flush_sigqueue(struct sigpending *queue);
254 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
255 static inline int valid_signal(unsigned long sig)
257 return sig <= _NSIG ? 1 : 0;
263 extern int next_signal(struct sigpending *pending, sigset_t *mask);
264 extern int do_send_sig_info(int sig, struct siginfo *info,
265 struct task_struct *p, bool group);
266 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
267 extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
268 extern int do_sigtimedwait(const sigset_t *, siginfo_t *,
269 const struct timespec *);
270 extern int sigprocmask(int, sigset_t *, sigset_t *);
271 extern void set_current_blocked(sigset_t *);
272 extern void __set_current_blocked(const sigset_t *);
273 extern int show_unhandled_signals;
276 #ifndef __ARCH_HAS_IRIX_SIGACTION
277 __sighandler_t sa_handler;
278 unsigned long sa_flags;
280 unsigned int sa_flags;
281 __sighandler_t sa_handler;
283 #ifdef __ARCH_HAS_SA_RESTORER
284 __sigrestore_t sa_restorer;
286 sigset_t sa_mask; /* mask last for extensibility */
291 #ifdef __ARCH_HAS_KA_RESTORER
292 __sigrestore_t ka_restorer;
296 #ifdef CONFIG_OLD_SIGACTION
297 struct old_sigaction {
298 __sighandler_t sa_handler;
299 old_sigset_t sa_mask;
300 unsigned long sa_flags;
301 __sigrestore_t sa_restorer;
306 struct k_sigaction ka;
311 extern int get_signal(struct ksignal *ksig);
312 extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
313 extern void exit_signals(struct task_struct *tsk);
314 extern void kernel_sigaction(int, __sighandler_t);
316 #define SIG_KTHREAD ((__force __sighandler_t)2)
317 #define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3)
319 static inline void allow_signal(int sig)
322 * Kernel threads handle their own signals. Let the signal code
323 * know it'll be handled, so that they don't get converted to
324 * SIGKILL or just silently dropped.
326 kernel_sigaction(sig, SIG_KTHREAD);
329 static inline void allow_kernel_signal(int sig)
332 * Kernel threads handle their own signals. Let the signal code
333 * know signals sent by the kernel will be handled, so that they
334 * don't get silently dropped.
336 kernel_sigaction(sig, SIG_KTHREAD_KERNEL);
339 static inline void disallow_signal(int sig)
341 kernel_sigaction(sig, SIG_IGN);
344 extern struct kmem_cache *sighand_cachep;
346 int unhandled_signal(struct task_struct *tsk, int sig);
349 * In POSIX a signal is sent either to a specific thread (Linux task)
350 * or to the process as a whole (Linux thread group). How the signal
351 * is sent determines whether it's to one thread or the whole group,
352 * which determines which signal mask(s) are involved in blocking it
353 * from being delivered until later. When the signal is delivered,
354 * either it's caught or ignored by a user handler or it has a default
355 * effect that applies to the whole thread group (POSIX process).
357 * The possible effects an unblocked signal set to SIG_DFL can have are:
358 * ignore - Nothing Happens
359 * terminate - kill the process, i.e. all threads in the group,
360 * similar to exit_group. The group leader (only) reports
361 * WIFSIGNALED status to its parent.
362 * coredump - write a core dump file describing all threads using
363 * the same mm and then kill all those threads
364 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
366 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
367 * Other signals when not blocked and set to SIG_DFL behaves as follows.
368 * The job control signals also have other special effects.
370 * +--------------------+------------------+
371 * | POSIX signal | default action |
372 * +--------------------+------------------+
373 * | SIGHUP | terminate |
374 * | SIGINT | terminate |
375 * | SIGQUIT | coredump |
376 * | SIGILL | coredump |
377 * | SIGTRAP | coredump |
378 * | SIGABRT/SIGIOT | coredump |
379 * | SIGBUS | coredump |
380 * | SIGFPE | coredump |
381 * | SIGKILL | terminate(+) |
382 * | SIGUSR1 | terminate |
383 * | SIGSEGV | coredump |
384 * | SIGUSR2 | terminate |
385 * | SIGPIPE | terminate |
386 * | SIGALRM | terminate |
387 * | SIGTERM | terminate |
388 * | SIGCHLD | ignore |
389 * | SIGCONT | ignore(*) |
390 * | SIGSTOP | stop(*)(+) |
391 * | SIGTSTP | stop(*) |
392 * | SIGTTIN | stop(*) |
393 * | SIGTTOU | stop(*) |
394 * | SIGURG | ignore |
395 * | SIGXCPU | coredump |
396 * | SIGXFSZ | coredump |
397 * | SIGVTALRM | terminate |
398 * | SIGPROF | terminate |
399 * | SIGPOLL/SIGIO | terminate |
400 * | SIGSYS/SIGUNUSED | coredump |
401 * | SIGSTKFLT | terminate |
402 * | SIGWINCH | ignore |
403 * | SIGPWR | terminate |
404 * | SIGRTMIN-SIGRTMAX | terminate |
405 * +--------------------+------------------+
406 * | non-POSIX signal | default action |
407 * +--------------------+------------------+
408 * | SIGEMT | coredump |
409 * +--------------------+------------------+
411 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
412 * (*) Special job control effects:
413 * When SIGCONT is sent, it resumes the process (all threads in the group)
414 * from TASK_STOPPED state and also clears any pending/queued stop signals
415 * (any of those marked with "stop(*)"). This happens regardless of blocking,
416 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
417 * any pending/queued SIGCONT signals; this happens regardless of blocking,
418 * catching, or ignored the stop signal, though (except for SIGSTOP) the
419 * default action of stopping the process may happen later or never.
423 #define SIGEMT_MASK rt_sigmask(SIGEMT)
425 #define SIGEMT_MASK 0
428 #if SIGRTMIN > BITS_PER_LONG
429 #define rt_sigmask(sig) (1ULL << ((sig)-1))
431 #define rt_sigmask(sig) sigmask(sig)
433 #define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
435 #define SIG_KERNEL_ONLY_MASK (\
436 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
438 #define SIG_KERNEL_STOP_MASK (\
439 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
440 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
442 #define SIG_KERNEL_COREDUMP_MASK (\
443 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
444 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
445 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
446 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
447 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
450 #define SIG_KERNEL_IGNORE_MASK (\
451 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
452 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
454 #define sig_kernel_only(sig) \
455 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
456 #define sig_kernel_coredump(sig) \
457 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
458 #define sig_kernel_ignore(sig) \
459 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
460 #define sig_kernel_stop(sig) \
461 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
463 #define sig_user_defined(t, signr) \
464 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
465 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
467 #define sig_fatal(t, signr) \
468 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
469 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
471 void signals_init(void);
473 int restore_altstack(const stack_t __user *);
474 int __save_altstack(stack_t __user *, unsigned long);
476 #define save_altstack_ex(uss, sp) do { \
477 stack_t __user *__uss = uss; \
478 struct task_struct *t = current; \
479 put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
480 put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
481 put_user_ex(t->sas_ss_size, &__uss->ss_size); \
484 #ifdef CONFIG_PROC_FS
486 extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);
489 #endif /* _LINUX_SIGNAL_H */