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
;
244 #ifndef __ARCH_HAS_IRIX_SIGACTION
245 __sighandler_t sa_handler
;
246 unsigned long sa_flags
;
248 unsigned int sa_flags
;
249 __sighandler_t sa_handler
;
251 #ifdef __ARCH_HAS_SA_RESTORER
252 __sigrestore_t sa_restorer
;
254 sigset_t sa_mask
; /* mask last for extensibility */
259 #ifdef __ARCH_HAS_KA_RESTORER
260 __sigrestore_t ka_restorer
;
264 #ifdef CONFIG_OLD_SIGACTION
265 struct old_sigaction
{
266 __sighandler_t sa_handler
;
267 old_sigset_t sa_mask
;
268 unsigned long sa_flags
;
269 __sigrestore_t sa_restorer
;
274 struct k_sigaction ka
;
279 extern int get_signal(struct ksignal
*ksig
);
280 extern void signal_setup_done(int failed
, struct ksignal
*ksig
, int stepping
);
281 extern void exit_signals(struct task_struct
*tsk
);
282 extern void kernel_sigaction(int, __sighandler_t
);
284 static inline void allow_signal(int sig
)
287 * Kernel threads handle their own signals. Let the signal code
288 * know it'll be handled, so that they don't get converted to
289 * SIGKILL or just silently dropped.
291 kernel_sigaction(sig
, (__force __sighandler_t
)2);
294 static inline void disallow_signal(int sig
)
296 kernel_sigaction(sig
, SIG_IGN
);
299 extern struct kmem_cache
*sighand_cachep
;
301 int unhandled_signal(struct task_struct
*tsk
, int sig
);
304 * In POSIX a signal is sent either to a specific thread (Linux task)
305 * or to the process as a whole (Linux thread group). How the signal
306 * is sent determines whether it's to one thread or the whole group,
307 * which determines which signal mask(s) are involved in blocking it
308 * from being delivered until later. When the signal is delivered,
309 * either it's caught or ignored by a user handler or it has a default
310 * effect that applies to the whole thread group (POSIX process).
312 * The possible effects an unblocked signal set to SIG_DFL can have are:
313 * ignore - Nothing Happens
314 * terminate - kill the process, i.e. all threads in the group,
315 * similar to exit_group. The group leader (only) reports
316 * WIFSIGNALED status to its parent.
317 * coredump - write a core dump file describing all threads using
318 * the same mm and then kill all those threads
319 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
321 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
322 * Other signals when not blocked and set to SIG_DFL behaves as follows.
323 * The job control signals also have other special effects.
325 * +--------------------+------------------+
326 * | POSIX signal | default action |
327 * +--------------------+------------------+
328 * | SIGHUP | terminate |
329 * | SIGINT | terminate |
330 * | SIGQUIT | coredump |
331 * | SIGILL | coredump |
332 * | SIGTRAP | coredump |
333 * | SIGABRT/SIGIOT | coredump |
334 * | SIGBUS | coredump |
335 * | SIGFPE | coredump |
336 * | SIGKILL | terminate(+) |
337 * | SIGUSR1 | terminate |
338 * | SIGSEGV | coredump |
339 * | SIGUSR2 | terminate |
340 * | SIGPIPE | terminate |
341 * | SIGALRM | terminate |
342 * | SIGTERM | terminate |
343 * | SIGCHLD | ignore |
344 * | SIGCONT | ignore(*) |
345 * | SIGSTOP | stop(*)(+) |
346 * | SIGTSTP | stop(*) |
347 * | SIGTTIN | stop(*) |
348 * | SIGTTOU | stop(*) |
349 * | SIGURG | ignore |
350 * | SIGXCPU | coredump |
351 * | SIGXFSZ | coredump |
352 * | SIGVTALRM | terminate |
353 * | SIGPROF | terminate |
354 * | SIGPOLL/SIGIO | terminate |
355 * | SIGSYS/SIGUNUSED | coredump |
356 * | SIGSTKFLT | terminate |
357 * | SIGWINCH | ignore |
358 * | SIGPWR | terminate |
359 * | SIGRTMIN-SIGRTMAX | terminate |
360 * +--------------------+------------------+
361 * | non-POSIX signal | default action |
362 * +--------------------+------------------+
363 * | SIGEMT | coredump |
364 * +--------------------+------------------+
366 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
367 * (*) Special job control effects:
368 * When SIGCONT is sent, it resumes the process (all threads in the group)
369 * from TASK_STOPPED state and also clears any pending/queued stop signals
370 * (any of those marked with "stop(*)"). This happens regardless of blocking,
371 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
372 * any pending/queued SIGCONT signals; this happens regardless of blocking,
373 * catching, or ignored the stop signal, though (except for SIGSTOP) the
374 * default action of stopping the process may happen later or never.
378 #define SIGEMT_MASK rt_sigmask(SIGEMT)
380 #define SIGEMT_MASK 0
383 #if SIGRTMIN > BITS_PER_LONG
384 #define rt_sigmask(sig) (1ULL << ((sig)-1))
386 #define rt_sigmask(sig) sigmask(sig)
388 #define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
390 #define SIG_KERNEL_ONLY_MASK (\
391 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
393 #define SIG_KERNEL_STOP_MASK (\
394 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
395 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
397 #define SIG_KERNEL_COREDUMP_MASK (\
398 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
399 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
400 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
401 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
402 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
405 #define SIG_KERNEL_IGNORE_MASK (\
406 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
407 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
409 #define sig_kernel_only(sig) \
410 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
411 #define sig_kernel_coredump(sig) \
412 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
413 #define sig_kernel_ignore(sig) \
414 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
415 #define sig_kernel_stop(sig) \
416 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
418 #define sig_user_defined(t, signr) \
419 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
420 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
422 #define sig_fatal(t, signr) \
423 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
424 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
426 void signals_init(void);
428 int restore_altstack(const stack_t __user
*);
429 int __save_altstack(stack_t __user
*, unsigned long);
431 #define save_altstack_ex(uss, sp) do { \
432 stack_t __user *__uss = uss; \
433 struct task_struct *t = current; \
434 put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
435 put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
436 put_user_ex(t->sas_ss_size, &__uss->ss_size); \
439 #ifdef CONFIG_PROC_FS
441 extern void render_sigset_t(struct seq_file
*, const char *, sigset_t
*);
444 #endif /* _LINUX_SIGNAL_H */