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TOMOYO Linux Cross Reference
Linux/include/linux/signal.h

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  1 #ifndef _LINUX_SIGNAL_H
  2 #define _LINUX_SIGNAL_H
  3 
  4 #include <asm/signal.h>
  5 #include <asm/siginfo.h>
  6 
  7 #ifdef __KERNEL__
  8 #include <linux/list.h>
  9 
 10 /*
 11  * Real Time signals may be queued.
 12  */
 13 
 14 struct sigqueue {
 15         struct list_head list;
 16         int flags;
 17         siginfo_t info;
 18         struct user_struct *user;
 19 };
 20 
 21 /* flags values. */
 22 #define SIGQUEUE_PREALLOC       1
 23 
 24 struct sigpending {
 25         struct list_head list;
 26         sigset_t signal;
 27 };
 28 
 29 /*
 30  * Define some primitives to manipulate sigset_t.
 31  */
 32 
 33 #ifndef __HAVE_ARCH_SIG_BITOPS
 34 #include <linux/bitops.h>
 35 
 36 /* We don't use <linux/bitops.h> for these because there is no need to
 37    be atomic.  */
 38 static inline void sigaddset(sigset_t *set, int _sig)
 39 {
 40         unsigned long sig = _sig - 1;
 41         if (_NSIG_WORDS == 1)
 42                 set->sig[0] |= 1UL << sig;
 43         else
 44                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
 45 }
 46 
 47 static inline void sigdelset(sigset_t *set, int _sig)
 48 {
 49         unsigned long sig = _sig - 1;
 50         if (_NSIG_WORDS == 1)
 51                 set->sig[0] &= ~(1UL << sig);
 52         else
 53                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
 54 }
 55 
 56 static inline int sigismember(sigset_t *set, int _sig)
 57 {
 58         unsigned long sig = _sig - 1;
 59         if (_NSIG_WORDS == 1)
 60                 return 1 & (set->sig[0] >> sig);
 61         else
 62                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
 63 }
 64 
 65 static inline int sigfindinword(unsigned long word)
 66 {
 67         return ffz(~word);
 68 }
 69 
 70 #endif /* __HAVE_ARCH_SIG_BITOPS */
 71 
 72 static inline int sigisemptyset(sigset_t *set)
 73 {
 74         extern void _NSIG_WORDS_is_unsupported_size(void);
 75         switch (_NSIG_WORDS) {
 76         case 4:
 77                 return (set->sig[3] | set->sig[2] |
 78                         set->sig[1] | set->sig[0]) == 0;
 79         case 2:
 80                 return (set->sig[1] | set->sig[0]) == 0;
 81         case 1:
 82                 return set->sig[0] == 0;
 83         default:
 84                 _NSIG_WORDS_is_unsupported_size();
 85                 return 0;
 86         }
 87 }
 88 
 89 #define sigmask(sig)    (1UL << ((sig) - 1))
 90 
 91 #ifndef __HAVE_ARCH_SIG_SETOPS
 92 #include <linux/string.h>
 93 
 94 #define _SIG_SET_BINOP(name, op)                                        \
 95 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
 96 {                                                                       \
 97         extern void _NSIG_WORDS_is_unsupported_size(void);              \
 98         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
 99                                                                         \
100         switch (_NSIG_WORDS) {                                          \
101             case 4:                                                     \
102                 a3 = a->sig[3]; a2 = a->sig[2];                         \
103                 b3 = b->sig[3]; b2 = b->sig[2];                         \
104                 r->sig[3] = op(a3, b3);                                 \
105                 r->sig[2] = op(a2, b2);                                 \
106             case 2:                                                     \
107                 a1 = a->sig[1]; b1 = b->sig[1];                         \
108                 r->sig[1] = op(a1, b1);                                 \
109             case 1:                                                     \
110                 a0 = a->sig[0]; b0 = b->sig[0];                         \
111                 r->sig[0] = op(a0, b0);                                 \
112                 break;                                                  \
113             default:                                                    \
114                 _NSIG_WORDS_is_unsupported_size();                      \
115         }                                                               \
116 }
117 
118 #define _sig_or(x,y)    ((x) | (y))
119 _SIG_SET_BINOP(sigorsets, _sig_or)
120 
121 #define _sig_and(x,y)   ((x) & (y))
122 _SIG_SET_BINOP(sigandsets, _sig_and)
123 
124 #define _sig_nand(x,y)  ((x) & ~(y))
125 _SIG_SET_BINOP(signandsets, _sig_nand)
126 
127 #undef _SIG_SET_BINOP
128 #undef _sig_or
129 #undef _sig_and
130 #undef _sig_nand
131 
132 #define _SIG_SET_OP(name, op)                                           \
133 static inline void name(sigset_t *set)                                  \
134 {                                                                       \
135         extern void _NSIG_WORDS_is_unsupported_size(void);              \
136                                                                         \
137         switch (_NSIG_WORDS) {                                          \
138             case 4: set->sig[3] = op(set->sig[3]);                      \
139                     set->sig[2] = op(set->sig[2]);                      \
140             case 2: set->sig[1] = op(set->sig[1]);                      \
141             case 1: set->sig[0] = op(set->sig[0]);                      \
142                     break;                                              \
143             default:                                                    \
144                 _NSIG_WORDS_is_unsupported_size();                      \
145         }                                                               \
146 }
147 
148 #define _sig_not(x)     (~(x))
149 _SIG_SET_OP(signotset, _sig_not)
150 
151 #undef _SIG_SET_OP
152 #undef _sig_not
153 
154 static inline void sigemptyset(sigset_t *set)
155 {
156         switch (_NSIG_WORDS) {
157         default:
158                 memset(set, 0, sizeof(sigset_t));
159                 break;
160         case 2: set->sig[1] = 0;
161         case 1: set->sig[0] = 0;
162                 break;
163         }
164 }
165 
166 static inline void sigfillset(sigset_t *set)
167 {
168         switch (_NSIG_WORDS) {
169         default:
170                 memset(set, -1, sizeof(sigset_t));
171                 break;
172         case 2: set->sig[1] = -1;
173         case 1: set->sig[0] = -1;
174                 break;
175         }
176 }
177 
178 /* Some extensions for manipulating the low 32 signals in particular.  */
179 
180 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
181 {
182         set->sig[0] |= mask;
183 }
184 
185 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
186 {
187         set->sig[0] &= ~mask;
188 }
189 
190 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
191 {
192         return (set->sig[0] & mask) != 0;
193 }
194 
195 static inline void siginitset(sigset_t *set, unsigned long mask)
196 {
197         set->sig[0] = mask;
198         switch (_NSIG_WORDS) {
199         default:
200                 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
201                 break;
202         case 2: set->sig[1] = 0;
203         case 1: ;
204         }
205 }
206 
207 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
208 {
209         set->sig[0] = ~mask;
210         switch (_NSIG_WORDS) {
211         default:
212                 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
213                 break;
214         case 2: set->sig[1] = -1;
215         case 1: ;
216         }
217 }
218 
219 #endif /* __HAVE_ARCH_SIG_SETOPS */
220 
221 static inline void init_sigpending(struct sigpending *sig)
222 {
223         sigemptyset(&sig->signal);
224         INIT_LIST_HEAD(&sig->list);
225 }
226 
227 extern void flush_sigqueue(struct sigpending *queue);
228 
229 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
230 static inline int valid_signal(unsigned long sig)
231 {
232         return sig <= _NSIG ? 1 : 0;
233 }
234 
235 extern int next_signal(struct sigpending *pending, sigset_t *mask);
236 extern int do_send_sig_info(int sig, struct siginfo *info,
237                                 struct task_struct *p, bool group);
238 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
239 extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
240 extern long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig,
241                                  siginfo_t *info);
242 extern long do_sigpending(void __user *, unsigned long);
243 extern int sigprocmask(int, sigset_t *, sigset_t *);
244 extern int show_unhandled_signals;
245 
246 struct pt_regs;
247 extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
248 extern void exit_signals(struct task_struct *tsk);
249 
250 extern struct kmem_cache *sighand_cachep;
251 
252 int unhandled_signal(struct task_struct *tsk, int sig);
253 
254 /*
255  * In POSIX a signal is sent either to a specific thread (Linux task)
256  * or to the process as a whole (Linux thread group).  How the signal
257  * is sent determines whether it's to one thread or the whole group,
258  * which determines which signal mask(s) are involved in blocking it
259  * from being delivered until later.  When the signal is delivered,
260  * either it's caught or ignored by a user handler or it has a default
261  * effect that applies to the whole thread group (POSIX process).
262  *
263  * The possible effects an unblocked signal set to SIG_DFL can have are:
264  *   ignore     - Nothing Happens
265  *   terminate  - kill the process, i.e. all threads in the group,
266  *                similar to exit_group.  The group leader (only) reports
267  *                WIFSIGNALED status to its parent.
268  *   coredump   - write a core dump file describing all threads using
269  *                the same mm and then kill all those threads
270  *   stop       - stop all the threads in the group, i.e. TASK_STOPPED state
271  *
272  * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
273  * Other signals when not blocked and set to SIG_DFL behaves as follows.
274  * The job control signals also have other special effects.
275  *
276  *      +--------------------+------------------+
277  *      |  POSIX signal      |  default action  |
278  *      +--------------------+------------------+
279  *      |  SIGHUP            |  terminate       |
280  *      |  SIGINT            |  terminate       |
281  *      |  SIGQUIT           |  coredump        |
282  *      |  SIGILL            |  coredump        |
283  *      |  SIGTRAP           |  coredump        |
284  *      |  SIGABRT/SIGIOT    |  coredump        |
285  *      |  SIGBUS            |  coredump        |
286  *      |  SIGFPE            |  coredump        |
287  *      |  SIGKILL           |  terminate(+)    |
288  *      |  SIGUSR1           |  terminate       |
289  *      |  SIGSEGV           |  coredump        |
290  *      |  SIGUSR2           |  terminate       |
291  *      |  SIGPIPE           |  terminate       |
292  *      |  SIGALRM           |  terminate       |
293  *      |  SIGTERM           |  terminate       |
294  *      |  SIGCHLD           |  ignore          |
295  *      |  SIGCONT           |  ignore(*)       |
296  *      |  SIGSTOP           |  stop(*)(+)      |
297  *      |  SIGTSTP           |  stop(*)         |
298  *      |  SIGTTIN           |  stop(*)         |
299  *      |  SIGTTOU           |  stop(*)         |
300  *      |  SIGURG            |  ignore          |
301  *      |  SIGXCPU           |  coredump        |
302  *      |  SIGXFSZ           |  coredump        |
303  *      |  SIGVTALRM         |  terminate       |
304  *      |  SIGPROF           |  terminate       |
305  *      |  SIGPOLL/SIGIO     |  terminate       |
306  *      |  SIGSYS/SIGUNUSED  |  coredump        |
307  *      |  SIGSTKFLT         |  terminate       |
308  *      |  SIGWINCH          |  ignore          |
309  *      |  SIGPWR            |  terminate       |
310  *      |  SIGRTMIN-SIGRTMAX |  terminate       |
311  *      +--------------------+------------------+
312  *      |  non-POSIX signal  |  default action  |
313  *      +--------------------+------------------+
314  *      |  SIGEMT            |  coredump        |
315  *      +--------------------+------------------+
316  *
317  * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
318  * (*) Special job control effects:
319  * When SIGCONT is sent, it resumes the process (all threads in the group)
320  * from TASK_STOPPED state and also clears any pending/queued stop signals
321  * (any of those marked with "stop(*)").  This happens regardless of blocking,
322  * catching, or ignoring SIGCONT.  When any stop signal is sent, it clears
323  * any pending/queued SIGCONT signals; this happens regardless of blocking,
324  * catching, or ignored the stop signal, though (except for SIGSTOP) the
325  * default action of stopping the process may happen later or never.
326  */
327 
328 #ifdef SIGEMT
329 #define SIGEMT_MASK     rt_sigmask(SIGEMT)
330 #else
331 #define SIGEMT_MASK     0
332 #endif
333 
334 #if SIGRTMIN > BITS_PER_LONG
335 #define rt_sigmask(sig) (1ULL << ((sig)-1))
336 #else
337 #define rt_sigmask(sig) sigmask(sig)
338 #endif
339 #define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
340 
341 #define SIG_KERNEL_ONLY_MASK (\
342         rt_sigmask(SIGKILL)   |  rt_sigmask(SIGSTOP))
343 
344 #define SIG_KERNEL_STOP_MASK (\
345         rt_sigmask(SIGSTOP)   |  rt_sigmask(SIGTSTP)   | \
346         rt_sigmask(SIGTTIN)   |  rt_sigmask(SIGTTOU)   )
347 
348 #define SIG_KERNEL_COREDUMP_MASK (\
349         rt_sigmask(SIGQUIT)   |  rt_sigmask(SIGILL)    | \
350         rt_sigmask(SIGTRAP)   |  rt_sigmask(SIGABRT)   | \
351         rt_sigmask(SIGFPE)    |  rt_sigmask(SIGSEGV)   | \
352         rt_sigmask(SIGBUS)    |  rt_sigmask(SIGSYS)    | \
353         rt_sigmask(SIGXCPU)   |  rt_sigmask(SIGXFSZ)   | \
354         SIGEMT_MASK                                    )
355 
356 #define SIG_KERNEL_IGNORE_MASK (\
357         rt_sigmask(SIGCONT)   |  rt_sigmask(SIGCHLD)   | \
358         rt_sigmask(SIGWINCH)  |  rt_sigmask(SIGURG)    )
359 
360 #define sig_kernel_only(sig) \
361         (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
362 #define sig_kernel_coredump(sig) \
363         (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
364 #define sig_kernel_ignore(sig) \
365         (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
366 #define sig_kernel_stop(sig) \
367         (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
368 
369 #define sig_user_defined(t, signr) \
370         (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) &&  \
371          ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
372 
373 #define sig_fatal(t, signr) \
374         (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
375          (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
376 
377 void signals_init(void);
378 
379 #endif /* __KERNEL__ */
380 
381 #endif /* _LINUX_SIGNAL_H */
382 

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