1 #ifndef _LINUX_SIGNAL_H
2 #define _LINUX_SIGNAL_H
4 #include <linux/list.h>
5 #include <uapi/linux/signal.h>
10 extern int print_fatal_signals
;
12 * Real Time signals may be queued.
16 struct list_head list
;
19 struct user_struct
*user
;
23 #define SIGQUEUE_PREALLOC 1
26 struct list_head list
;
31 * Define some primitives to manipulate sigset_t.
34 #ifndef __HAVE_ARCH_SIG_BITOPS
35 #include <linux/bitops.h>
37 /* We don't use <linux/bitops.h> for these because there is no need to
39 static inline void sigaddset(sigset_t
*set
, int _sig
)
41 unsigned long sig
= _sig
- 1;
43 set
->sig
[0] |= 1UL << sig
;
45 set
->sig
[sig
/ _NSIG_BPW
] |= 1UL << (sig
% _NSIG_BPW
);
48 static inline void sigdelset(sigset_t
*set
, int _sig
)
50 unsigned long sig
= _sig
- 1;
52 set
->sig
[0] &= ~(1UL << sig
);
54 set
->sig
[sig
/ _NSIG_BPW
] &= ~(1UL << (sig
% _NSIG_BPW
));
57 static inline int sigismember(sigset_t
*set
, int _sig
)
59 unsigned long sig
= _sig
- 1;
61 return 1 & (set
->sig
[0] >> sig
);
63 return 1 & (set
->sig
[sig
/ _NSIG_BPW
] >> (sig
% _NSIG_BPW
));
66 #endif /* __HAVE_ARCH_SIG_BITOPS */
68 static inline int sigisemptyset(sigset_t
*set
)
70 extern void _NSIG_WORDS_is_unsupported_size(void);
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;
80 _NSIG_WORDS_is_unsupported_size();
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 extern void _NSIG_WORDS_is_unsupported_size(void); \
94 unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
96 switch (_NSIG_WORDS) { \
98 a3 = a->sig[3]; a2 = a->sig[2]; \
99 b3 = b->sig[3]; b2 = b->sig[2]; \
100 r->sig[3] = op(a3, b3); \
101 r->sig[2] = op(a2, b2); \
103 a1 = a->sig[1]; b1 = b->sig[1]; \
104 r->sig[1] = op(a1, b1); \
106 a0 = a->sig[0]; b0 = b->sig[0]; \
107 r->sig[0] = op(a0, b0); \
110 _NSIG_WORDS_is_unsupported_size(); \
114 #define _sig_or(x,y) ((x) | (y))
115 _SIG_SET_BINOP(sigorsets
, _sig_or
)
117 #define _sig_and(x,y) ((x) & (y))
118 _SIG_SET_BINOP(sigandsets
, _sig_and
)
120 #define _sig_andn(x,y) ((x) & ~(y))
121 _SIG_SET_BINOP(sigandnsets
, _sig_andn
)
123 #undef _SIG_SET_BINOP
128 #define _SIG_SET_OP(name, op) \
129 static inline void name(sigset_t *set) \
131 extern void _NSIG_WORDS_is_unsupported_size(void); \
133 switch (_NSIG_WORDS) { \
134 case 4: set->sig[3] = op(set->sig[3]); \
135 set->sig[2] = op(set->sig[2]); \
136 case 2: set->sig[1] = op(set->sig[1]); \
137 case 1: set->sig[0] = op(set->sig[0]); \
140 _NSIG_WORDS_is_unsupported_size(); \
144 #define _sig_not(x) (~(x))
145 _SIG_SET_OP(signotset
, _sig_not
)
150 static inline void sigemptyset(sigset_t
*set
)
152 switch (_NSIG_WORDS
) {
154 memset(set
, 0, sizeof(sigset_t
));
156 case 2: set
->sig
[1] = 0;
157 case 1: set
->sig
[0] = 0;
162 static inline void sigfillset(sigset_t
*set
)
164 switch (_NSIG_WORDS
) {
166 memset(set
, -1, sizeof(sigset_t
));
168 case 2: set
->sig
[1] = -1;
169 case 1: set
->sig
[0] = -1;
174 /* Some extensions for manipulating the low 32 signals in particular. */
176 static inline void sigaddsetmask(sigset_t
*set
, unsigned long mask
)
181 static inline void sigdelsetmask(sigset_t
*set
, unsigned long mask
)
183 set
->sig
[0] &= ~mask
;
186 static inline int sigtestsetmask(sigset_t
*set
, unsigned long mask
)
188 return (set
->sig
[0] & mask
) != 0;
191 static inline void siginitset(sigset_t
*set
, unsigned long mask
)
194 switch (_NSIG_WORDS
) {
196 memset(&set
->sig
[1], 0, sizeof(long)*(_NSIG_WORDS
-1));
198 case 2: set
->sig
[1] = 0;
203 static inline void siginitsetinv(sigset_t
*set
, unsigned long mask
)
206 switch (_NSIG_WORDS
) {
208 memset(&set
->sig
[1], -1, sizeof(long)*(_NSIG_WORDS
-1));
210 case 2: set
->sig
[1] = -1;
215 #endif /* __HAVE_ARCH_SIG_SETOPS */
217 static inline void init_sigpending(struct sigpending
*sig
)
219 sigemptyset(&sig
->signal
);
220 INIT_LIST_HEAD(&sig
->list
);
223 extern void flush_sigqueue(struct sigpending
*queue
);
225 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
226 static inline int valid_signal(unsigned long sig
)
228 return sig
<= _NSIG
? 1 : 0;
234 extern int next_signal(struct sigpending
*pending
, sigset_t
*mask
);
235 extern int do_send_sig_info(int sig
, struct siginfo
*info
,
236 struct task_struct
*p
, bool group
);
237 extern int group_send_sig_info(int sig
, struct siginfo
*info
, struct task_struct
*p
);
238 extern int __group_send_sig_info(int, struct siginfo
*, struct task_struct
*);
239 extern int do_sigtimedwait(const sigset_t
*, siginfo_t
*,
240 const struct timespec
*);
241 extern int sigprocmask(int, sigset_t
*, sigset_t
*);
242 extern void set_current_blocked(sigset_t
*);
243 extern void __set_current_blocked(const sigset_t
*);
244 extern int show_unhandled_signals
;
245 extern int sigsuspend(sigset_t
*);
248 #ifndef __ARCH_HAS_IRIX_SIGACTION
249 __sighandler_t sa_handler
;
250 unsigned long sa_flags
;
252 unsigned int sa_flags
;
253 __sighandler_t sa_handler
;
255 #ifdef __ARCH_HAS_SA_RESTORER
256 __sigrestore_t sa_restorer
;
258 sigset_t sa_mask
; /* mask last for extensibility */
263 #ifdef __ARCH_HAS_KA_RESTORER
264 __sigrestore_t ka_restorer
;
268 #ifdef CONFIG_OLD_SIGACTION
269 struct old_sigaction
{
270 __sighandler_t sa_handler
;
271 old_sigset_t sa_mask
;
272 unsigned long sa_flags
;
273 __sigrestore_t sa_restorer
;
278 struct k_sigaction ka
;
283 extern int get_signal(struct ksignal
*ksig
);
284 extern void signal_setup_done(int failed
, struct ksignal
*ksig
, int stepping
);
285 extern void exit_signals(struct task_struct
*tsk
);
286 extern void kernel_sigaction(int, __sighandler_t
);
288 static inline void allow_signal(int sig
)
291 * Kernel threads handle their own signals. Let the signal code
292 * know it'll be handled, so that they don't get converted to
293 * SIGKILL or just silently dropped.
295 kernel_sigaction(sig
, (__force __sighandler_t
)2);
298 static inline void disallow_signal(int sig
)
300 kernel_sigaction(sig
, SIG_IGN
);
303 extern struct kmem_cache
*sighand_cachep
;
305 int unhandled_signal(struct task_struct
*tsk
, int sig
);
308 * In POSIX a signal is sent either to a specific thread (Linux task)
309 * or to the process as a whole (Linux thread group). How the signal
310 * is sent determines whether it's to one thread or the whole group,
311 * which determines which signal mask(s) are involved in blocking it
312 * from being delivered until later. When the signal is delivered,
313 * either it's caught or ignored by a user handler or it has a default
314 * effect that applies to the whole thread group (POSIX process).
316 * The possible effects an unblocked signal set to SIG_DFL can have are:
317 * ignore - Nothing Happens
318 * terminate - kill the process, i.e. all threads in the group,
319 * similar to exit_group. The group leader (only) reports
320 * WIFSIGNALED status to its parent.
321 * coredump - write a core dump file describing all threads using
322 * the same mm and then kill all those threads
323 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
325 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
326 * Other signals when not blocked and set to SIG_DFL behaves as follows.
327 * The job control signals also have other special effects.
329 * +--------------------+------------------+
330 * | POSIX signal | default action |
331 * +--------------------+------------------+
332 * | SIGHUP | terminate |
333 * | SIGINT | terminate |
334 * | SIGQUIT | coredump |
335 * | SIGILL | coredump |
336 * | SIGTRAP | coredump |
337 * | SIGABRT/SIGIOT | coredump |
338 * | SIGBUS | coredump |
339 * | SIGFPE | coredump |
340 * | SIGKILL | terminate(+) |
341 * | SIGUSR1 | terminate |
342 * | SIGSEGV | coredump |
343 * | SIGUSR2 | terminate |
344 * | SIGPIPE | terminate |
345 * | SIGALRM | terminate |
346 * | SIGTERM | terminate |
347 * | SIGCHLD | ignore |
348 * | SIGCONT | ignore(*) |
349 * | SIGSTOP | stop(*)(+) |
350 * | SIGTSTP | stop(*) |
351 * | SIGTTIN | stop(*) |
352 * | SIGTTOU | stop(*) |
353 * | SIGURG | ignore |
354 * | SIGXCPU | coredump |
355 * | SIGXFSZ | coredump |
356 * | SIGVTALRM | terminate |
357 * | SIGPROF | terminate |
358 * | SIGPOLL/SIGIO | terminate |
359 * | SIGSYS/SIGUNUSED | coredump |
360 * | SIGSTKFLT | terminate |
361 * | SIGWINCH | ignore |
362 * | SIGPWR | terminate |
363 * | SIGRTMIN-SIGRTMAX | terminate |
364 * +--------------------+------------------+
365 * | non-POSIX signal | default action |
366 * +--------------------+------------------+
367 * | SIGEMT | coredump |
368 * +--------------------+------------------+
370 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
371 * (*) Special job control effects:
372 * When SIGCONT is sent, it resumes the process (all threads in the group)
373 * from TASK_STOPPED state and also clears any pending/queued stop signals
374 * (any of those marked with "stop(*)"). This happens regardless of blocking,
375 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
376 * any pending/queued SIGCONT signals; this happens regardless of blocking,
377 * catching, or ignored the stop signal, though (except for SIGSTOP) the
378 * default action of stopping the process may happen later or never.
382 #define SIGEMT_MASK rt_sigmask(SIGEMT)
384 #define SIGEMT_MASK 0
387 #if SIGRTMIN > BITS_PER_LONG
388 #define rt_sigmask(sig) (1ULL << ((sig)-1))
390 #define rt_sigmask(sig) sigmask(sig)
392 #define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
394 #define SIG_KERNEL_ONLY_MASK (\
395 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
397 #define SIG_KERNEL_STOP_MASK (\
398 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
399 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
401 #define SIG_KERNEL_COREDUMP_MASK (\
402 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
403 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
404 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
405 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
406 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
409 #define SIG_KERNEL_IGNORE_MASK (\
410 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
411 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
413 #define sig_kernel_only(sig) \
414 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
415 #define sig_kernel_coredump(sig) \
416 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
417 #define sig_kernel_ignore(sig) \
418 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
419 #define sig_kernel_stop(sig) \
420 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
422 #define sig_user_defined(t, signr) \
423 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
424 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
426 #define sig_fatal(t, signr) \
427 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
428 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
430 void signals_init(void);
432 int restore_altstack(const stack_t __user
*);
433 int __save_altstack(stack_t __user
*, unsigned long);
435 #define save_altstack_ex(uss, sp) do { \
436 stack_t __user *__uss = uss; \
437 struct task_struct *t = current; \
438 put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
439 put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
440 put_user_ex(t->sas_ss_size, &__uss->ss_size); \
443 #ifdef CONFIG_PROC_FS
445 extern void render_sigset_t(struct seq_file
*, const char *, sigset_t
*);
448 #endif /* _LINUX_SIGNAL_H */