1 #ifndef _LINUX_SIGNAL_H
2 #define _LINUX_SIGNAL_H
4 #include <asm/signal.h>
5 #include <asm/siginfo.h>
8 #include <linux/list.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 static inline int sigfindinword(unsigned long word
)
72 #endif /* __HAVE_ARCH_SIG_BITOPS */
74 static inline int sigisemptyset(sigset_t
*set
)
76 extern void _NSIG_WORDS_is_unsupported_size(void);
77 switch (_NSIG_WORDS
) {
79 return (set
->sig
[3] | set
->sig
[2] |
80 set
->sig
[1] | set
->sig
[0]) == 0;
82 return (set
->sig
[1] | set
->sig
[0]) == 0;
84 return set
->sig
[0] == 0;
86 _NSIG_WORDS_is_unsupported_size();
91 #define sigmask(sig) (1UL << ((sig) - 1))
93 #ifndef __HAVE_ARCH_SIG_SETOPS
94 #include <linux/string.h>
96 #define _SIG_SET_BINOP(name, op) \
97 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
99 extern void _NSIG_WORDS_is_unsupported_size(void); \
100 unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
102 switch (_NSIG_WORDS) { \
104 a3 = a->sig[3]; a2 = a->sig[2]; \
105 b3 = b->sig[3]; b2 = b->sig[2]; \
106 r->sig[3] = op(a3, b3); \
107 r->sig[2] = op(a2, b2); \
109 a1 = a->sig[1]; b1 = b->sig[1]; \
110 r->sig[1] = op(a1, b1); \
112 a0 = a->sig[0]; b0 = b->sig[0]; \
113 r->sig[0] = op(a0, b0); \
116 _NSIG_WORDS_is_unsupported_size(); \
120 #define _sig_or(x,y) ((x) | (y))
121 _SIG_SET_BINOP(sigorsets
, _sig_or
)
123 #define _sig_and(x,y) ((x) & (y))
124 _SIG_SET_BINOP(sigandsets
, _sig_and
)
126 #define _sig_nand(x,y) ((x) & ~(y))
127 _SIG_SET_BINOP(signandsets
, _sig_nand
)
129 #undef _SIG_SET_BINOP
134 #define _SIG_SET_OP(name, op) \
135 static inline void name(sigset_t *set) \
137 extern void _NSIG_WORDS_is_unsupported_size(void); \
139 switch (_NSIG_WORDS) { \
140 case 4: set->sig[3] = op(set->sig[3]); \
141 set->sig[2] = op(set->sig[2]); \
142 case 2: set->sig[1] = op(set->sig[1]); \
143 case 1: set->sig[0] = op(set->sig[0]); \
146 _NSIG_WORDS_is_unsupported_size(); \
150 #define _sig_not(x) (~(x))
151 _SIG_SET_OP(signotset
, _sig_not
)
156 static inline void sigemptyset(sigset_t
*set
)
158 switch (_NSIG_WORDS
) {
160 memset(set
, 0, sizeof(sigset_t
));
162 case 2: set
->sig
[1] = 0;
163 case 1: set
->sig
[0] = 0;
168 static inline void sigfillset(sigset_t
*set
)
170 switch (_NSIG_WORDS
) {
172 memset(set
, -1, sizeof(sigset_t
));
174 case 2: set
->sig
[1] = -1;
175 case 1: set
->sig
[0] = -1;
180 /* Some extensions for manipulating the low 32 signals in particular. */
182 static inline void sigaddsetmask(sigset_t
*set
, unsigned long mask
)
187 static inline void sigdelsetmask(sigset_t
*set
, unsigned long mask
)
189 set
->sig
[0] &= ~mask
;
192 static inline int sigtestsetmask(sigset_t
*set
, unsigned long mask
)
194 return (set
->sig
[0] & mask
) != 0;
197 static inline void siginitset(sigset_t
*set
, unsigned long mask
)
200 switch (_NSIG_WORDS
) {
202 memset(&set
->sig
[1], 0, sizeof(long)*(_NSIG_WORDS
-1));
204 case 2: set
->sig
[1] = 0;
209 static inline void siginitsetinv(sigset_t
*set
, unsigned long mask
)
212 switch (_NSIG_WORDS
) {
214 memset(&set
->sig
[1], -1, sizeof(long)*(_NSIG_WORDS
-1));
216 case 2: set
->sig
[1] = -1;
221 #endif /* __HAVE_ARCH_SIG_SETOPS */
223 static inline void init_sigpending(struct sigpending
*sig
)
225 sigemptyset(&sig
->signal
);
226 INIT_LIST_HEAD(&sig
->list
);
229 extern void flush_sigqueue(struct sigpending
*queue
);
231 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
232 static inline int valid_signal(unsigned long sig
)
234 return sig
<= _NSIG
? 1 : 0;
237 extern int next_signal(struct sigpending
*pending
, sigset_t
*mask
);
238 extern int do_send_sig_info(int sig
, struct siginfo
*info
,
239 struct task_struct
*p
, bool group
);
240 extern int group_send_sig_info(int sig
, struct siginfo
*info
, struct task_struct
*p
);
241 extern int __group_send_sig_info(int, struct siginfo
*, struct task_struct
*);
242 extern long do_rt_tgsigqueueinfo(pid_t tgid
, pid_t pid
, int sig
,
244 extern long do_sigpending(void __user
*, unsigned long);
245 extern int sigprocmask(int, sigset_t
*, sigset_t
*);
246 extern int show_unhandled_signals
;
249 extern int get_signal_to_deliver(siginfo_t
*info
, struct k_sigaction
*return_ka
, struct pt_regs
*regs
, void *cookie
);
250 extern void exit_signals(struct task_struct
*tsk
);
252 extern struct kmem_cache
*sighand_cachep
;
254 int unhandled_signal(struct task_struct
*tsk
, int sig
);
257 * In POSIX a signal is sent either to a specific thread (Linux task)
258 * or to the process as a whole (Linux thread group). How the signal
259 * is sent determines whether it's to one thread or the whole group,
260 * which determines which signal mask(s) are involved in blocking it
261 * from being delivered until later. When the signal is delivered,
262 * either it's caught or ignored by a user handler or it has a default
263 * effect that applies to the whole thread group (POSIX process).
265 * The possible effects an unblocked signal set to SIG_DFL can have are:
266 * ignore - Nothing Happens
267 * terminate - kill the process, i.e. all threads in the group,
268 * similar to exit_group. The group leader (only) reports
269 * WIFSIGNALED status to its parent.
270 * coredump - write a core dump file describing all threads using
271 * the same mm and then kill all those threads
272 * stop - stop all the threads in the group, i.e. TASK_STOPPED state
274 * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
275 * Other signals when not blocked and set to SIG_DFL behaves as follows.
276 * The job control signals also have other special effects.
278 * +--------------------+------------------+
279 * | POSIX signal | default action |
280 * +--------------------+------------------+
281 * | SIGHUP | terminate |
282 * | SIGINT | terminate |
283 * | SIGQUIT | coredump |
284 * | SIGILL | coredump |
285 * | SIGTRAP | coredump |
286 * | SIGABRT/SIGIOT | coredump |
287 * | SIGBUS | coredump |
288 * | SIGFPE | coredump |
289 * | SIGKILL | terminate(+) |
290 * | SIGUSR1 | terminate |
291 * | SIGSEGV | coredump |
292 * | SIGUSR2 | terminate |
293 * | SIGPIPE | terminate |
294 * | SIGALRM | terminate |
295 * | SIGTERM | terminate |
296 * | SIGCHLD | ignore |
297 * | SIGCONT | ignore(*) |
298 * | SIGSTOP | stop(*)(+) |
299 * | SIGTSTP | stop(*) |
300 * | SIGTTIN | stop(*) |
301 * | SIGTTOU | stop(*) |
302 * | SIGURG | ignore |
303 * | SIGXCPU | coredump |
304 * | SIGXFSZ | coredump |
305 * | SIGVTALRM | terminate |
306 * | SIGPROF | terminate |
307 * | SIGPOLL/SIGIO | terminate |
308 * | SIGSYS/SIGUNUSED | coredump |
309 * | SIGSTKFLT | terminate |
310 * | SIGWINCH | ignore |
311 * | SIGPWR | terminate |
312 * | SIGRTMIN-SIGRTMAX | terminate |
313 * +--------------------+------------------+
314 * | non-POSIX signal | default action |
315 * +--------------------+------------------+
316 * | SIGEMT | coredump |
317 * +--------------------+------------------+
319 * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
320 * (*) Special job control effects:
321 * When SIGCONT is sent, it resumes the process (all threads in the group)
322 * from TASK_STOPPED state and also clears any pending/queued stop signals
323 * (any of those marked with "stop(*)"). This happens regardless of blocking,
324 * catching, or ignoring SIGCONT. When any stop signal is sent, it clears
325 * any pending/queued SIGCONT signals; this happens regardless of blocking,
326 * catching, or ignored the stop signal, though (except for SIGSTOP) the
327 * default action of stopping the process may happen later or never.
331 #define SIGEMT_MASK rt_sigmask(SIGEMT)
333 #define SIGEMT_MASK 0
336 #if SIGRTMIN > BITS_PER_LONG
337 #define rt_sigmask(sig) (1ULL << ((sig)-1))
339 #define rt_sigmask(sig) sigmask(sig)
341 #define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
343 #define SIG_KERNEL_ONLY_MASK (\
344 rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
346 #define SIG_KERNEL_STOP_MASK (\
347 rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
348 rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
350 #define SIG_KERNEL_COREDUMP_MASK (\
351 rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
352 rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
353 rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
354 rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
355 rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
358 #define SIG_KERNEL_IGNORE_MASK (\
359 rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
360 rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
362 #define sig_kernel_only(sig) \
363 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
364 #define sig_kernel_coredump(sig) \
365 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
366 #define sig_kernel_ignore(sig) \
367 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
368 #define sig_kernel_stop(sig) \
369 (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
371 #define sig_user_defined(t, signr) \
372 (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
373 ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
375 #define sig_fatal(t, signr) \
376 (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
377 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
379 void signals_init(void);
381 #endif /* __KERNEL__ */
383 #endif /* _LINUX_SIGNAL_H */
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