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;
32 * Define some primitives to manipulate sigset_t.
35 #ifndef __HAVE_ARCH_SIG_BITOPS
36 #include <linux/bitops.h>
38 /* We don't use <linux/bitops.h> for these because there is no need to
40 static inline void sigaddset(sigset_t *set, int _sig)
42 unsigned long sig = _sig - 1;
44 set->sig[0] |= 1UL << sig;
46 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
49 static inline void sigdelset(sigset_t *set, int _sig)
51 unsigned long sig = _sig - 1;
53 set->sig[0] &= ~(1UL << sig);
55 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
58 static inline int sigismember(sigset_t *set, int _sig)
60 unsigned long sig = _sig - 1;
62 return 1 & (set->sig[0] >> sig);
64 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
67 #endif /* __HAVE_ARCH_SIG_BITOPS */
69 static inline int sigisemptyset(sigset_t *set)
71 switch (_NSIG_WORDS) {
73 return (set->sig[3] | set->sig[2] |
74 set->sig[1] | set->sig[0]) == 0;
76 return (set->sig[1] | set->sig[0]) == 0;
78 return set->sig[0] == 0;
85 #define sigmask(sig) (1UL << ((sig) - 1))
87 #ifndef __HAVE_ARCH_SIG_SETOPS
88 #include <linux/string.h>
90 #define _SIG_SET_BINOP(name, op) \
91 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
93 unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
95 switch (_NSIG_WORDS) { \
97 a3 = a->sig[3]; a2 = a->sig[2]; \
98 b3 = b->sig[3]; b2 = b->sig[2]; \
99 r->sig[3] = op(a3, b3); \
100 r->sig[2] = op(a2, b2); \
102 a1 = a->sig[1]; b1 = b->sig[1]; \
103 r->sig[1] = op(a1, b1); \
105 a0 = a->sig[0]; b0 = b->sig[0]; \
106 r->sig[0] = op(a0, b0); \
113 #define _sig_or(x,y) ((x) | (y))
114 _SIG_SET_BINOP(sigorsets, _sig_or)
116 #define _sig_and(x,y) ((x) & (y))
117 _SIG_SET_BINOP(sigandsets, _sig_and)
119 #define _sig_andn(x,y) ((x) & ~(y))
120 _SIG_SET_BINOP(sigandnsets, _sig_andn)
122 #undef _SIG_SET_BINOP
127 #define _SIG_SET_OP(name, op) \
128 static inline void name(sigset_t *set) \
130 switch (_NSIG_WORDS) { \
131 case 4: set->sig[3] = op(set->sig[3]); \
132 set->sig[2] = op(set->sig[2]); \
133 case 2: set->sig[1] = op(set->sig[1]); \
134 case 1: set->sig[0] = op(set->sig[0]); \
141 #define _sig_not(x) (~(x))
142 _SIG_SET_OP(signotset, _sig_not)
147 static inline void sigemptyset(sigset_t *set)
149 switch (_NSIG_WORDS) {
151 memset(set, 0, sizeof(sigset_t));
153 case 2: set->sig[1] = 0;
154 case 1: set->sig[0] = 0;
159 static inline void sigfillset(sigset_t *set)
161 switch (_NSIG_WORDS) {
163 memset(set, -1, sizeof(sigset_t));
165 case 2: set->sig[1] = -1;
166 case 1: set->sig[0] = -1;
171 /* Some extensions for manipulating the low 32 signals in particular. */
173 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
178 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
180 set->sig[0] &= ~mask;
183 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
185 return (set->sig[0] & mask) != 0;
188 static inline void siginitset(sigset_t *set, unsigned long mask)
191 switch (_NSIG_WORDS) {
193 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
195 case 2: set->sig[1] = 0;
200 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
203 switch (_NSIG_WORDS) {
205 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
207 case 2: set->sig[1] = -1;
212 #endif /* __HAVE_ARCH_SIG_SETOPS */
214 static inline void init_sigpending(struct sigpending *sig)
216 sigemptyset(&sig->signal);
217 INIT_LIST_HEAD(&sig->list);
220 extern void flush_sigqueue(struct sigpending *queue);
222 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
223 static inline int valid_signal(unsigned long sig)
225 return sig <= _NSIG ? 1 : 0;
231 extern int next_signal(struct sigpending *pending, sigset_t *mask);
232 extern int do_send_sig_info(int sig, struct siginfo *info,
233 struct task_struct *p, bool group);
234 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
235 extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
236 extern int do_sigtimedwait(const sigset_t *, siginfo_t *,
237 const struct timespec *);
238 extern int sigprocmask(int, sigset_t *, sigset_t *);
239 extern void set_current_blocked(sigset_t *);
240 extern void __set_current_blocked(const sigset_t *);
241 extern int show_unhandled_signals;
242 extern int sigsuspend(sigset_t *);
245 #ifndef __ARCH_HAS_IRIX_SIGACTION
246 __sighandler_t sa_handler;
247 unsigned long sa_flags;
249 unsigned int sa_flags;
250 __sighandler_t sa_handler;
252 #ifdef __ARCH_HAS_SA_RESTORER
253 __sigrestore_t sa_restorer;
255 sigset_t sa_mask; /* mask last for extensibility */
260 #ifdef __ARCH_HAS_KA_RESTORER
261 __sigrestore_t ka_restorer;
265 #ifdef CONFIG_OLD_SIGACTION
266 struct old_sigaction {
267 __sighandler_t sa_handler;
268 old_sigset_t sa_mask;
269 unsigned long sa_flags;
270 __sigrestore_t sa_restorer;
275 struct k_sigaction ka;
280 extern int get_signal(struct ksignal *ksig);
281 extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
282 extern void exit_signals(struct task_struct *tsk);
283 extern void kernel_sigaction(int, __sighandler_t);
285 static inline void allow_signal(int sig)
288 * Kernel threads handle their own signals. Let the signal code
289 * know it'll be handled, so that they don't get converted to
290 * SIGKILL or just silently dropped.
292 kernel_sigaction(sig, (__force __sighandler_t)2);
295 static inline void disallow_signal(int sig)
297 kernel_sigaction(sig, SIG_IGN);
300 extern struct kmem_cache *sighand_cachep;
302 int unhandled_signal(struct task_struct *tsk, int sig);
305 * In POSIX a signal is sent either to a specific thread (Linux task)
306 * or to the process as a whole (Linux thread group). How the signal
307 * is sent determines whether it's to one thread or the whole group,
308 * which determines which signal mask(s) are involved in blocking it
309 * from being delivered until later. When the signal is delivered,
310 * either it's caught or ignored by a user handler or it has a default
311 * effect that applies to the whole thread group (POSIX process).
313 * The possible effects an unblocked signal set to SIG_DFL can have are:
314 * ignore - Nothing Happens
315 * terminate - kill the process, i.e. all threads in the group,
316 * similar to exit_group. The group leader (only) reports
317 * WIFSIGNALED status to its parent.
318 * coredump - write a core dump file describing all threads using
319 * the same mm and then kill all those threads
320 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
322 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
323 * Other signals when not blocked and set to SIG_DFL behaves as follows.
324 * The job control signals also have other special effects.
326 * +--------------------+------------------+
327 * | POSIX signal | default action |
328 * +--------------------+------------------+
329 * | SIGHUP | terminate |
330 * | SIGINT | terminate |
331 * | SIGQUIT | coredump |
332 * | SIGILL | coredump |
333 * | SIGTRAP | coredump |
334 * | SIGABRT/SIGIOT | coredump |
335 * | SIGBUS | coredump |
336 * | SIGFPE | coredump |
337 * | SIGKILL | terminate(+) |
338 * | SIGUSR1 | terminate |
339 * | SIGSEGV | coredump |
340 * | SIGUSR2 | terminate |
341 * | SIGPIPE | terminate |
342 * | SIGALRM | terminate |
343 * | SIGTERM | terminate |
344 * | SIGCHLD | ignore |
345 * | SIGCONT | ignore(*) |
346 * | SIGSTOP | stop(*)(+) |
347 * | SIGTSTP | stop(*) |
348 * | SIGTTIN | stop(*) |
349 * | SIGTTOU | stop(*) |
350 * | SIGURG | ignore |
351 * | SIGXCPU | coredump |
352 * | SIGXFSZ | coredump |
353 * | SIGVTALRM | terminate |
354 * | SIGPROF | terminate |
355 * | SIGPOLL/SIGIO | terminate |
356 * | SIGSYS/SIGUNUSED | coredump |
357 * | SIGSTKFLT | terminate |
358 * | SIGWINCH | ignore |
359 * | SIGPWR | terminate |
360 * | SIGRTMIN-SIGRTMAX | terminate |
361 * +--------------------+------------------+
362 * | non-POSIX signal | default action |
363 * +--------------------+------------------+
364 * | SIGEMT | coredump |
365 * +--------------------+------------------+
367 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
368 * (*) Special job control effects:
369 * When SIGCONT is sent, it resumes the process (all threads in the group)
370 * from TASK_STOPPED state and also clears any pending/queued stop signals
371 * (any of those marked with "stop(*)"). This happens regardless of blocking,
372 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
373 * any pending/queued SIGCONT signals; this happens regardless of blocking,
374 * catching, or ignored the stop signal, though (except for SIGSTOP) the
375 * default action of stopping the process may happen later or never.
379 #define SIGEMT_MASK rt_sigmask(SIGEMT)
381 #define SIGEMT_MASK 0
384 #if SIGRTMIN > BITS_PER_LONG
385 #define rt_sigmask(sig) (1ULL << ((sig)-1))
387 #define rt_sigmask(sig) sigmask(sig)
389 #define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
391 #define SIG_KERNEL_ONLY_MASK (\
392 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
394 #define SIG_KERNEL_STOP_MASK (\
395 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
396 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
398 #define SIG_KERNEL_COREDUMP_MASK (\
399 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
400 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
401 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
402 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
403 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
406 #define SIG_KERNEL_IGNORE_MASK (\
407 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
408 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
410 #define sig_kernel_only(sig) \
411 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
412 #define sig_kernel_coredump(sig) \
413 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
414 #define sig_kernel_ignore(sig) \
415 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
416 #define sig_kernel_stop(sig) \
417 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
419 #define sig_user_defined(t, signr) \
420 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
421 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
423 #define sig_fatal(t, signr) \
424 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
425 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
427 void signals_init(void);
429 int restore_altstack(const stack_t __user *);
430 int __save_altstack(stack_t __user *, unsigned long);
432 #define save_altstack_ex(uss, sp) do { \
433 stack_t __user *__uss = uss; \
434 struct task_struct *t = current; \
435 put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
436 put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
437 put_user_ex(t->sas_ss_size, &__uss->ss_size); \
440 #ifdef CONFIG_PROC_FS
442 extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);
445 #endif /* _LINUX_SIGNAL_H */