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3f07c014 IM |
1 | #ifndef _LINUX_SCHED_SIGNAL_H |
2 | #define _LINUX_SCHED_SIGNAL_H | |
3 | ||
b2d09103 | 4 | #include <linux/rculist.h> |
f361bf4a | 5 | #include <linux/signal.h> |
3f07c014 | 6 | #include <linux/sched.h> |
1e4bae64 | 7 | #include <linux/sched/jobctl.h> |
9164bb4a | 8 | #include <linux/sched/task.h> |
2a1f062a | 9 | #include <linux/cred.h> |
3f07c014 | 10 | |
c3edc401 IM |
11 | /* |
12 | * Types defining task->signal and task->sighand and APIs using them: | |
13 | */ | |
14 | ||
15 | struct sighand_struct { | |
16 | atomic_t count; | |
17 | struct k_sigaction action[_NSIG]; | |
18 | spinlock_t siglock; | |
19 | wait_queue_head_t signalfd_wqh; | |
20 | }; | |
21 | ||
8d88460e IM |
22 | /* |
23 | * Per-process accounting stats: | |
24 | */ | |
25 | struct pacct_struct { | |
26 | int ac_flag; | |
27 | long ac_exitcode; | |
28 | unsigned long ac_mem; | |
29 | u64 ac_utime, ac_stime; | |
30 | unsigned long ac_minflt, ac_majflt; | |
31 | }; | |
32 | ||
33 | struct cpu_itimer { | |
34 | u64 expires; | |
35 | u64 incr; | |
36 | }; | |
37 | ||
1050b27c IM |
38 | /* |
39 | * This is the atomic variant of task_cputime, which can be used for | |
40 | * storing and updating task_cputime statistics without locking. | |
41 | */ | |
42 | struct task_cputime_atomic { | |
43 | atomic64_t utime; | |
44 | atomic64_t stime; | |
45 | atomic64_t sum_exec_runtime; | |
46 | }; | |
47 | ||
48 | #define INIT_CPUTIME_ATOMIC \ | |
49 | (struct task_cputime_atomic) { \ | |
50 | .utime = ATOMIC64_INIT(0), \ | |
51 | .stime = ATOMIC64_INIT(0), \ | |
52 | .sum_exec_runtime = ATOMIC64_INIT(0), \ | |
53 | } | |
54 | /** | |
55 | * struct thread_group_cputimer - thread group interval timer counts | |
56 | * @cputime_atomic: atomic thread group interval timers. | |
57 | * @running: true when there are timers running and | |
58 | * @cputime_atomic receives updates. | |
59 | * @checking_timer: true when a thread in the group is in the | |
60 | * process of checking for thread group timers. | |
61 | * | |
62 | * This structure contains the version of task_cputime, above, that is | |
63 | * used for thread group CPU timer calculations. | |
64 | */ | |
65 | struct thread_group_cputimer { | |
66 | struct task_cputime_atomic cputime_atomic; | |
67 | bool running; | |
68 | bool checking_timer; | |
69 | }; | |
70 | ||
c3edc401 IM |
71 | /* |
72 | * NOTE! "signal_struct" does not have its own | |
73 | * locking, because a shared signal_struct always | |
74 | * implies a shared sighand_struct, so locking | |
75 | * sighand_struct is always a proper superset of | |
76 | * the locking of signal_struct. | |
77 | */ | |
78 | struct signal_struct { | |
79 | atomic_t sigcnt; | |
80 | atomic_t live; | |
81 | int nr_threads; | |
82 | struct list_head thread_head; | |
83 | ||
84 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
85 | ||
86 | /* current thread group signal load-balancing target: */ | |
87 | struct task_struct *curr_target; | |
88 | ||
89 | /* shared signal handling: */ | |
90 | struct sigpending shared_pending; | |
91 | ||
92 | /* thread group exit support */ | |
93 | int group_exit_code; | |
94 | /* overloaded: | |
95 | * - notify group_exit_task when ->count is equal to notify_count | |
96 | * - everyone except group_exit_task is stopped during signal delivery | |
97 | * of fatal signals, group_exit_task processes the signal. | |
98 | */ | |
99 | int notify_count; | |
100 | struct task_struct *group_exit_task; | |
101 | ||
102 | /* thread group stop support, overloads group_exit_code too */ | |
103 | int group_stop_count; | |
104 | unsigned int flags; /* see SIGNAL_* flags below */ | |
105 | ||
106 | /* | |
107 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
108 | * manager, to re-parent orphan (double-forking) child processes | |
109 | * to this process instead of 'init'. The service manager is | |
110 | * able to receive SIGCHLD signals and is able to investigate | |
111 | * the process until it calls wait(). All children of this | |
112 | * process will inherit a flag if they should look for a | |
113 | * child_subreaper process at exit. | |
114 | */ | |
115 | unsigned int is_child_subreaper:1; | |
116 | unsigned int has_child_subreaper:1; | |
117 | ||
118 | #ifdef CONFIG_POSIX_TIMERS | |
119 | ||
120 | /* POSIX.1b Interval Timers */ | |
121 | int posix_timer_id; | |
122 | struct list_head posix_timers; | |
123 | ||
124 | /* ITIMER_REAL timer for the process */ | |
125 | struct hrtimer real_timer; | |
126 | ktime_t it_real_incr; | |
127 | ||
128 | /* | |
129 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
130 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
131 | * values are defined to 0 and 1 respectively | |
132 | */ | |
133 | struct cpu_itimer it[2]; | |
134 | ||
135 | /* | |
136 | * Thread group totals for process CPU timers. | |
137 | * See thread_group_cputimer(), et al, for details. | |
138 | */ | |
139 | struct thread_group_cputimer cputimer; | |
140 | ||
141 | /* Earliest-expiration cache. */ | |
142 | struct task_cputime cputime_expires; | |
143 | ||
144 | struct list_head cpu_timers[3]; | |
145 | ||
146 | #endif | |
147 | ||
148 | struct pid *leader_pid; | |
149 | ||
150 | #ifdef CONFIG_NO_HZ_FULL | |
151 | atomic_t tick_dep_mask; | |
152 | #endif | |
153 | ||
154 | struct pid *tty_old_pgrp; | |
155 | ||
156 | /* boolean value for session group leader */ | |
157 | int leader; | |
158 | ||
159 | struct tty_struct *tty; /* NULL if no tty */ | |
160 | ||
161 | #ifdef CONFIG_SCHED_AUTOGROUP | |
162 | struct autogroup *autogroup; | |
163 | #endif | |
164 | /* | |
165 | * Cumulative resource counters for dead threads in the group, | |
166 | * and for reaped dead child processes forked by this group. | |
167 | * Live threads maintain their own counters and add to these | |
168 | * in __exit_signal, except for the group leader. | |
169 | */ | |
170 | seqlock_t stats_lock; | |
171 | u64 utime, stime, cutime, cstime; | |
172 | u64 gtime; | |
173 | u64 cgtime; | |
174 | struct prev_cputime prev_cputime; | |
175 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; | |
176 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
177 | unsigned long inblock, oublock, cinblock, coublock; | |
178 | unsigned long maxrss, cmaxrss; | |
179 | struct task_io_accounting ioac; | |
180 | ||
181 | /* | |
182 | * Cumulative ns of schedule CPU time fo dead threads in the | |
183 | * group, not including a zombie group leader, (This only differs | |
184 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
185 | * other than jiffies.) | |
186 | */ | |
187 | unsigned long long sum_sched_runtime; | |
188 | ||
189 | /* | |
190 | * We don't bother to synchronize most readers of this at all, | |
191 | * because there is no reader checking a limit that actually needs | |
192 | * to get both rlim_cur and rlim_max atomically, and either one | |
193 | * alone is a single word that can safely be read normally. | |
194 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
195 | * protect this instead of the siglock, because they really | |
196 | * have no need to disable irqs. | |
197 | */ | |
198 | struct rlimit rlim[RLIM_NLIMITS]; | |
199 | ||
200 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
201 | struct pacct_struct pacct; /* per-process accounting information */ | |
202 | #endif | |
203 | #ifdef CONFIG_TASKSTATS | |
204 | struct taskstats *stats; | |
205 | #endif | |
206 | #ifdef CONFIG_AUDIT | |
207 | unsigned audit_tty; | |
208 | struct tty_audit_buf *tty_audit_buf; | |
209 | #endif | |
210 | ||
211 | /* | |
212 | * Thread is the potential origin of an oom condition; kill first on | |
213 | * oom | |
214 | */ | |
215 | bool oom_flag_origin; | |
216 | short oom_score_adj; /* OOM kill score adjustment */ | |
217 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
218 | * Only settable by CAP_SYS_RESOURCE. */ | |
219 | struct mm_struct *oom_mm; /* recorded mm when the thread group got | |
220 | * killed by the oom killer */ | |
221 | ||
222 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
223 | * credential calculations | |
224 | * (notably. ptrace) */ | |
3859a271 | 225 | } __randomize_layout; |
c3edc401 IM |
226 | |
227 | /* | |
228 | * Bits in flags field of signal_struct. | |
229 | */ | |
230 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
231 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ | |
232 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
233 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ | |
234 | /* | |
235 | * Pending notifications to parent. | |
236 | */ | |
237 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
238 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
239 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
240 | ||
241 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ | |
242 | ||
243 | #define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \ | |
244 | SIGNAL_STOP_CONTINUED) | |
245 | ||
246 | static inline void signal_set_stop_flags(struct signal_struct *sig, | |
247 | unsigned int flags) | |
248 | { | |
249 | WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP)); | |
250 | sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags; | |
251 | } | |
252 | ||
253 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ | |
254 | static inline int signal_group_exit(const struct signal_struct *sig) | |
255 | { | |
256 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
257 | (sig->group_exit_task != NULL); | |
258 | } | |
259 | ||
260 | extern void flush_signals(struct task_struct *); | |
261 | extern void ignore_signals(struct task_struct *); | |
262 | extern void flush_signal_handlers(struct task_struct *, int force_default); | |
263 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
264 | ||
265 | static inline int kernel_dequeue_signal(siginfo_t *info) | |
266 | { | |
267 | struct task_struct *tsk = current; | |
268 | siginfo_t __info; | |
269 | int ret; | |
270 | ||
271 | spin_lock_irq(&tsk->sighand->siglock); | |
272 | ret = dequeue_signal(tsk, &tsk->blocked, info ?: &__info); | |
273 | spin_unlock_irq(&tsk->sighand->siglock); | |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | static inline void kernel_signal_stop(void) | |
279 | { | |
280 | spin_lock_irq(¤t->sighand->siglock); | |
281 | if (current->jobctl & JOBCTL_STOP_DEQUEUED) | |
282 | __set_current_state(TASK_STOPPED); | |
283 | spin_unlock_irq(¤t->sighand->siglock); | |
284 | ||
285 | schedule(); | |
286 | } | |
287 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
288 | extern int force_sigsegv(int, struct task_struct *); | |
289 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
290 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); | |
291 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); | |
292 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, | |
293 | const struct cred *, u32); | |
294 | extern int kill_pgrp(struct pid *pid, int sig, int priv); | |
295 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3edc401 IM |
296 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
297 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); | |
298 | extern void force_sig(int, struct task_struct *); | |
299 | extern int send_sig(int, struct task_struct *, int); | |
300 | extern int zap_other_threads(struct task_struct *p); | |
301 | extern struct sigqueue *sigqueue_alloc(void); | |
302 | extern void sigqueue_free(struct sigqueue *); | |
303 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); | |
304 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); | |
305 | ||
2a1f062a IM |
306 | static inline int restart_syscall(void) |
307 | { | |
308 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
309 | return -ERESTARTNOINTR; | |
310 | } | |
311 | ||
312 | static inline int signal_pending(struct task_struct *p) | |
313 | { | |
314 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
315 | } | |
316 | ||
317 | static inline int __fatal_signal_pending(struct task_struct *p) | |
318 | { | |
319 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
320 | } | |
321 | ||
322 | static inline int fatal_signal_pending(struct task_struct *p) | |
323 | { | |
324 | return signal_pending(p) && __fatal_signal_pending(p); | |
325 | } | |
326 | ||
327 | static inline int signal_pending_state(long state, struct task_struct *p) | |
328 | { | |
329 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
330 | return 0; | |
331 | if (!signal_pending(p)) | |
332 | return 0; | |
333 | ||
334 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); | |
335 | } | |
336 | ||
337 | /* | |
338 | * Reevaluate whether the task has signals pending delivery. | |
339 | * Wake the task if so. | |
340 | * This is required every time the blocked sigset_t changes. | |
341 | * callers must hold sighand->siglock. | |
342 | */ | |
343 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
344 | extern void recalc_sigpending(void); | |
345 | ||
346 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); | |
347 | ||
348 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
349 | { | |
350 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
351 | } | |
352 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
353 | { | |
354 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
355 | } | |
356 | ||
c3edc401 IM |
357 | #ifdef TIF_RESTORE_SIGMASK |
358 | /* | |
359 | * Legacy restore_sigmask accessors. These are inefficient on | |
360 | * SMP architectures because they require atomic operations. | |
361 | */ | |
362 | ||
363 | /** | |
364 | * set_restore_sigmask() - make sure saved_sigmask processing gets done | |
365 | * | |
366 | * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code | |
367 | * will run before returning to user mode, to process the flag. For | |
368 | * all callers, TIF_SIGPENDING is already set or it's no harm to set | |
369 | * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the | |
370 | * arch code will notice on return to user mode, in case those bits | |
371 | * are scarce. We set TIF_SIGPENDING here to ensure that the arch | |
372 | * signal code always gets run when TIF_RESTORE_SIGMASK is set. | |
373 | */ | |
374 | static inline void set_restore_sigmask(void) | |
375 | { | |
376 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
377 | WARN_ON(!test_thread_flag(TIF_SIGPENDING)); | |
378 | } | |
379 | static inline void clear_restore_sigmask(void) | |
380 | { | |
381 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
382 | } | |
383 | static inline bool test_restore_sigmask(void) | |
384 | { | |
385 | return test_thread_flag(TIF_RESTORE_SIGMASK); | |
386 | } | |
387 | static inline bool test_and_clear_restore_sigmask(void) | |
388 | { | |
389 | return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); | |
390 | } | |
391 | ||
392 | #else /* TIF_RESTORE_SIGMASK */ | |
393 | ||
394 | /* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */ | |
395 | static inline void set_restore_sigmask(void) | |
396 | { | |
397 | current->restore_sigmask = true; | |
398 | WARN_ON(!test_thread_flag(TIF_SIGPENDING)); | |
399 | } | |
400 | static inline void clear_restore_sigmask(void) | |
401 | { | |
402 | current->restore_sigmask = false; | |
403 | } | |
404 | static inline bool test_restore_sigmask(void) | |
405 | { | |
406 | return current->restore_sigmask; | |
407 | } | |
408 | static inline bool test_and_clear_restore_sigmask(void) | |
409 | { | |
410 | if (!current->restore_sigmask) | |
411 | return false; | |
412 | current->restore_sigmask = false; | |
413 | return true; | |
414 | } | |
415 | #endif | |
416 | ||
417 | static inline void restore_saved_sigmask(void) | |
418 | { | |
419 | if (test_and_clear_restore_sigmask()) | |
420 | __set_current_blocked(¤t->saved_sigmask); | |
421 | } | |
422 | ||
423 | static inline sigset_t *sigmask_to_save(void) | |
424 | { | |
425 | sigset_t *res = ¤t->blocked; | |
426 | if (unlikely(test_restore_sigmask())) | |
427 | res = ¤t->saved_sigmask; | |
428 | return res; | |
429 | } | |
430 | ||
431 | static inline int kill_cad_pid(int sig, int priv) | |
432 | { | |
433 | return kill_pid(cad_pid, sig, priv); | |
434 | } | |
435 | ||
436 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ | |
437 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
438 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
439 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
440 | ||
441 | /* | |
442 | * True if we are on the alternate signal stack. | |
443 | */ | |
444 | static inline int on_sig_stack(unsigned long sp) | |
445 | { | |
446 | /* | |
447 | * If the signal stack is SS_AUTODISARM then, by construction, we | |
448 | * can't be on the signal stack unless user code deliberately set | |
449 | * SS_AUTODISARM when we were already on it. | |
450 | * | |
451 | * This improves reliability: if user state gets corrupted such that | |
452 | * the stack pointer points very close to the end of the signal stack, | |
453 | * then this check will enable the signal to be handled anyway. | |
454 | */ | |
455 | if (current->sas_ss_flags & SS_AUTODISARM) | |
456 | return 0; | |
457 | ||
458 | #ifdef CONFIG_STACK_GROWSUP | |
459 | return sp >= current->sas_ss_sp && | |
460 | sp - current->sas_ss_sp < current->sas_ss_size; | |
461 | #else | |
462 | return sp > current->sas_ss_sp && | |
463 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
464 | #endif | |
465 | } | |
466 | ||
467 | static inline int sas_ss_flags(unsigned long sp) | |
468 | { | |
469 | if (!current->sas_ss_size) | |
470 | return SS_DISABLE; | |
471 | ||
472 | return on_sig_stack(sp) ? SS_ONSTACK : 0; | |
473 | } | |
474 | ||
475 | static inline void sas_ss_reset(struct task_struct *p) | |
476 | { | |
477 | p->sas_ss_sp = 0; | |
478 | p->sas_ss_size = 0; | |
479 | p->sas_ss_flags = SS_DISABLE; | |
480 | } | |
481 | ||
482 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) | |
483 | { | |
484 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
485 | #ifdef CONFIG_STACK_GROWSUP | |
486 | return current->sas_ss_sp; | |
487 | #else | |
488 | return current->sas_ss_sp + current->sas_ss_size; | |
489 | #endif | |
490 | return sp; | |
491 | } | |
492 | ||
493 | extern void __cleanup_sighand(struct sighand_struct *); | |
494 | extern void flush_itimer_signals(void); | |
495 | ||
496 | #define tasklist_empty() \ | |
497 | list_empty(&init_task.tasks) | |
498 | ||
499 | #define next_task(p) \ | |
500 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
501 | ||
502 | #define for_each_process(p) \ | |
503 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
504 | ||
505 | extern bool current_is_single_threaded(void); | |
506 | ||
507 | /* | |
508 | * Careful: do_each_thread/while_each_thread is a double loop so | |
509 | * 'break' will not work as expected - use goto instead. | |
510 | */ | |
511 | #define do_each_thread(g, t) \ | |
512 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
513 | ||
514 | #define while_each_thread(g, t) \ | |
515 | while ((t = next_thread(t)) != g) | |
516 | ||
517 | #define __for_each_thread(signal, t) \ | |
518 | list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) | |
519 | ||
520 | #define for_each_thread(p, t) \ | |
521 | __for_each_thread((p)->signal, t) | |
522 | ||
523 | /* Careful: this is a double loop, 'break' won't work as expected. */ | |
524 | #define for_each_process_thread(p, t) \ | |
525 | for_each_process(p) for_each_thread(p, t) | |
526 | ||
527 | typedef int (*proc_visitor)(struct task_struct *p, void *data); | |
528 | void walk_process_tree(struct task_struct *top, proc_visitor, void *); | |
529 | ||
530 | static inline int get_nr_threads(struct task_struct *tsk) | |
531 | { | |
532 | return tsk->signal->nr_threads; | |
533 | } | |
534 | ||
535 | static inline bool thread_group_leader(struct task_struct *p) | |
536 | { | |
537 | return p->exit_signal >= 0; | |
538 | } | |
539 | ||
540 | /* Do to the insanities of de_thread it is possible for a process | |
541 | * to have the pid of the thread group leader without actually being | |
542 | * the thread group leader. For iteration through the pids in proc | |
543 | * all we care about is that we have a task with the appropriate | |
544 | * pid, we don't actually care if we have the right task. | |
545 | */ | |
546 | static inline bool has_group_leader_pid(struct task_struct *p) | |
547 | { | |
548 | return task_pid(p) == p->signal->leader_pid; | |
549 | } | |
550 | ||
551 | static inline | |
552 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
553 | { | |
554 | return p1->signal == p2->signal; | |
555 | } | |
556 | ||
557 | static inline struct task_struct *next_thread(const struct task_struct *p) | |
558 | { | |
559 | return list_entry_rcu(p->thread_group.next, | |
560 | struct task_struct, thread_group); | |
561 | } | |
562 | ||
563 | static inline int thread_group_empty(struct task_struct *p) | |
564 | { | |
565 | return list_empty(&p->thread_group); | |
566 | } | |
567 | ||
568 | #define delay_group_leader(p) \ | |
569 | (thread_group_leader(p) && !thread_group_empty(p)) | |
570 | ||
571 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, | |
572 | unsigned long *flags); | |
573 | ||
574 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, | |
575 | unsigned long *flags) | |
576 | { | |
577 | struct sighand_struct *ret; | |
578 | ||
579 | ret = __lock_task_sighand(tsk, flags); | |
580 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
581 | return ret; | |
582 | } | |
583 | ||
584 | static inline void unlock_task_sighand(struct task_struct *tsk, | |
585 | unsigned long *flags) | |
586 | { | |
587 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
588 | } | |
589 | ||
590 | static inline unsigned long task_rlimit(const struct task_struct *tsk, | |
591 | unsigned int limit) | |
592 | { | |
593 | return READ_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
594 | } | |
595 | ||
596 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
597 | unsigned int limit) | |
598 | { | |
599 | return READ_ONCE(tsk->signal->rlim[limit].rlim_max); | |
600 | } | |
601 | ||
602 | static inline unsigned long rlimit(unsigned int limit) | |
603 | { | |
604 | return task_rlimit(current, limit); | |
605 | } | |
606 | ||
607 | static inline unsigned long rlimit_max(unsigned int limit) | |
608 | { | |
609 | return task_rlimit_max(current, limit); | |
610 | } | |
611 | ||
3f07c014 | 612 | #endif /* _LINUX_SCHED_SIGNAL_H */ |