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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
3f07c014 IM |
2 | #ifndef _LINUX_SCHED_SIGNAL_H |
3 | #define _LINUX_SCHED_SIGNAL_H | |
4 | ||
b2d09103 | 5 | #include <linux/rculist.h> |
f361bf4a | 6 | #include <linux/signal.h> |
3f07c014 | 7 | #include <linux/sched.h> |
1e4bae64 | 8 | #include <linux/sched/jobctl.h> |
9164bb4a | 9 | #include <linux/sched/task.h> |
2a1f062a | 10 | #include <linux/cred.h> |
d036bda7 | 11 | #include <linux/refcount.h> |
3f07c014 | 12 | |
c3edc401 IM |
13 | /* |
14 | * Types defining task->signal and task->sighand and APIs using them: | |
15 | */ | |
16 | ||
17 | struct sighand_struct { | |
d036bda7 | 18 | refcount_t count; |
c3edc401 IM |
19 | struct k_sigaction action[_NSIG]; |
20 | spinlock_t siglock; | |
21 | wait_queue_head_t signalfd_wqh; | |
22 | }; | |
23 | ||
8d88460e IM |
24 | /* |
25 | * Per-process accounting stats: | |
26 | */ | |
27 | struct pacct_struct { | |
28 | int ac_flag; | |
29 | long ac_exitcode; | |
30 | unsigned long ac_mem; | |
31 | u64 ac_utime, ac_stime; | |
32 | unsigned long ac_minflt, ac_majflt; | |
33 | }; | |
34 | ||
35 | struct cpu_itimer { | |
36 | u64 expires; | |
37 | u64 incr; | |
38 | }; | |
39 | ||
1050b27c IM |
40 | /* |
41 | * This is the atomic variant of task_cputime, which can be used for | |
42 | * storing and updating task_cputime statistics without locking. | |
43 | */ | |
44 | struct task_cputime_atomic { | |
45 | atomic64_t utime; | |
46 | atomic64_t stime; | |
47 | atomic64_t sum_exec_runtime; | |
48 | }; | |
49 | ||
50 | #define INIT_CPUTIME_ATOMIC \ | |
51 | (struct task_cputime_atomic) { \ | |
52 | .utime = ATOMIC64_INIT(0), \ | |
53 | .stime = ATOMIC64_INIT(0), \ | |
54 | .sum_exec_runtime = ATOMIC64_INIT(0), \ | |
55 | } | |
56 | /** | |
57 | * struct thread_group_cputimer - thread group interval timer counts | |
58 | * @cputime_atomic: atomic thread group interval timers. | |
59 | * @running: true when there are timers running and | |
60 | * @cputime_atomic receives updates. | |
61 | * @checking_timer: true when a thread in the group is in the | |
62 | * process of checking for thread group timers. | |
63 | * | |
64 | * This structure contains the version of task_cputime, above, that is | |
65 | * used for thread group CPU timer calculations. | |
66 | */ | |
67 | struct thread_group_cputimer { | |
68 | struct task_cputime_atomic cputime_atomic; | |
69 | bool running; | |
70 | bool checking_timer; | |
71 | }; | |
72 | ||
c3ad2c3b EB |
73 | struct multiprocess_signals { |
74 | sigset_t signal; | |
75 | struct hlist_node node; | |
76 | }; | |
77 | ||
c3edc401 IM |
78 | /* |
79 | * NOTE! "signal_struct" does not have its own | |
80 | * locking, because a shared signal_struct always | |
81 | * implies a shared sighand_struct, so locking | |
82 | * sighand_struct is always a proper superset of | |
83 | * the locking of signal_struct. | |
84 | */ | |
85 | struct signal_struct { | |
60d4de3f | 86 | refcount_t sigcnt; |
c3edc401 IM |
87 | atomic_t live; |
88 | int nr_threads; | |
89 | struct list_head thread_head; | |
90 | ||
91 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
92 | ||
93 | /* current thread group signal load-balancing target: */ | |
94 | struct task_struct *curr_target; | |
95 | ||
96 | /* shared signal handling: */ | |
97 | struct sigpending shared_pending; | |
98 | ||
c3ad2c3b EB |
99 | /* For collecting multiprocess signals during fork */ |
100 | struct hlist_head multiprocess; | |
101 | ||
c3edc401 IM |
102 | /* thread group exit support */ |
103 | int group_exit_code; | |
104 | /* overloaded: | |
105 | * - notify group_exit_task when ->count is equal to notify_count | |
106 | * - everyone except group_exit_task is stopped during signal delivery | |
107 | * of fatal signals, group_exit_task processes the signal. | |
108 | */ | |
109 | int notify_count; | |
110 | struct task_struct *group_exit_task; | |
111 | ||
112 | /* thread group stop support, overloads group_exit_code too */ | |
113 | int group_stop_count; | |
114 | unsigned int flags; /* see SIGNAL_* flags below */ | |
115 | ||
116 | /* | |
117 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
118 | * manager, to re-parent orphan (double-forking) child processes | |
119 | * to this process instead of 'init'. The service manager is | |
120 | * able to receive SIGCHLD signals and is able to investigate | |
121 | * the process until it calls wait(). All children of this | |
122 | * process will inherit a flag if they should look for a | |
123 | * child_subreaper process at exit. | |
124 | */ | |
125 | unsigned int is_child_subreaper:1; | |
126 | unsigned int has_child_subreaper:1; | |
127 | ||
128 | #ifdef CONFIG_POSIX_TIMERS | |
129 | ||
130 | /* POSIX.1b Interval Timers */ | |
131 | int posix_timer_id; | |
132 | struct list_head posix_timers; | |
133 | ||
134 | /* ITIMER_REAL timer for the process */ | |
135 | struct hrtimer real_timer; | |
136 | ktime_t it_real_incr; | |
137 | ||
138 | /* | |
139 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
140 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
141 | * values are defined to 0 and 1 respectively | |
142 | */ | |
143 | struct cpu_itimer it[2]; | |
144 | ||
145 | /* | |
146 | * Thread group totals for process CPU timers. | |
147 | * See thread_group_cputimer(), et al, for details. | |
148 | */ | |
149 | struct thread_group_cputimer cputimer; | |
150 | ||
151 | /* Earliest-expiration cache. */ | |
152 | struct task_cputime cputime_expires; | |
153 | ||
154 | struct list_head cpu_timers[3]; | |
155 | ||
156 | #endif | |
157 | ||
2c470475 | 158 | /* PID/PID hash table linkage. */ |
2c470475 | 159 | struct pid *pids[PIDTYPE_MAX]; |
c3edc401 IM |
160 | |
161 | #ifdef CONFIG_NO_HZ_FULL | |
162 | atomic_t tick_dep_mask; | |
163 | #endif | |
164 | ||
165 | struct pid *tty_old_pgrp; | |
166 | ||
167 | /* boolean value for session group leader */ | |
168 | int leader; | |
169 | ||
170 | struct tty_struct *tty; /* NULL if no tty */ | |
171 | ||
172 | #ifdef CONFIG_SCHED_AUTOGROUP | |
173 | struct autogroup *autogroup; | |
174 | #endif | |
175 | /* | |
176 | * Cumulative resource counters for dead threads in the group, | |
177 | * and for reaped dead child processes forked by this group. | |
178 | * Live threads maintain their own counters and add to these | |
179 | * in __exit_signal, except for the group leader. | |
180 | */ | |
181 | seqlock_t stats_lock; | |
182 | u64 utime, stime, cutime, cstime; | |
183 | u64 gtime; | |
184 | u64 cgtime; | |
185 | struct prev_cputime prev_cputime; | |
186 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; | |
187 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
188 | unsigned long inblock, oublock, cinblock, coublock; | |
189 | unsigned long maxrss, cmaxrss; | |
190 | struct task_io_accounting ioac; | |
191 | ||
192 | /* | |
193 | * Cumulative ns of schedule CPU time fo dead threads in the | |
194 | * group, not including a zombie group leader, (This only differs | |
195 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
196 | * other than jiffies.) | |
197 | */ | |
198 | unsigned long long sum_sched_runtime; | |
199 | ||
200 | /* | |
201 | * We don't bother to synchronize most readers of this at all, | |
202 | * because there is no reader checking a limit that actually needs | |
203 | * to get both rlim_cur and rlim_max atomically, and either one | |
204 | * alone is a single word that can safely be read normally. | |
205 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
206 | * protect this instead of the siglock, because they really | |
207 | * have no need to disable irqs. | |
208 | */ | |
209 | struct rlimit rlim[RLIM_NLIMITS]; | |
210 | ||
211 | #ifdef CONFIG_BSD_PROCESS_ACCT | |
212 | struct pacct_struct pacct; /* per-process accounting information */ | |
213 | #endif | |
214 | #ifdef CONFIG_TASKSTATS | |
215 | struct taskstats *stats; | |
216 | #endif | |
217 | #ifdef CONFIG_AUDIT | |
218 | unsigned audit_tty; | |
219 | struct tty_audit_buf *tty_audit_buf; | |
220 | #endif | |
221 | ||
222 | /* | |
223 | * Thread is the potential origin of an oom condition; kill first on | |
224 | * oom | |
225 | */ | |
226 | bool oom_flag_origin; | |
227 | short oom_score_adj; /* OOM kill score adjustment */ | |
228 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
229 | * Only settable by CAP_SYS_RESOURCE. */ | |
230 | struct mm_struct *oom_mm; /* recorded mm when the thread group got | |
231 | * killed by the oom killer */ | |
232 | ||
233 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
234 | * credential calculations | |
235 | * (notably. ptrace) */ | |
3859a271 | 236 | } __randomize_layout; |
c3edc401 IM |
237 | |
238 | /* | |
239 | * Bits in flags field of signal_struct. | |
240 | */ | |
241 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
242 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ | |
243 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
244 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ | |
245 | /* | |
246 | * Pending notifications to parent. | |
247 | */ | |
248 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
249 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
250 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
251 | ||
252 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ | |
253 | ||
254 | #define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \ | |
255 | SIGNAL_STOP_CONTINUED) | |
256 | ||
257 | static inline void signal_set_stop_flags(struct signal_struct *sig, | |
258 | unsigned int flags) | |
259 | { | |
260 | WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP)); | |
261 | sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags; | |
262 | } | |
263 | ||
264 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ | |
265 | static inline int signal_group_exit(const struct signal_struct *sig) | |
266 | { | |
267 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
268 | (sig->group_exit_task != NULL); | |
269 | } | |
270 | ||
271 | extern void flush_signals(struct task_struct *); | |
272 | extern void ignore_signals(struct task_struct *); | |
273 | extern void flush_signal_handlers(struct task_struct *, int force_default); | |
ae7795bc | 274 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, kernel_siginfo_t *info); |
c3edc401 | 275 | |
961366a0 | 276 | static inline int kernel_dequeue_signal(void) |
c3edc401 IM |
277 | { |
278 | struct task_struct *tsk = current; | |
ae7795bc | 279 | kernel_siginfo_t __info; |
c3edc401 IM |
280 | int ret; |
281 | ||
282 | spin_lock_irq(&tsk->sighand->siglock); | |
961366a0 | 283 | ret = dequeue_signal(tsk, &tsk->blocked, &__info); |
c3edc401 IM |
284 | spin_unlock_irq(&tsk->sighand->siglock); |
285 | ||
286 | return ret; | |
287 | } | |
288 | ||
289 | static inline void kernel_signal_stop(void) | |
290 | { | |
291 | spin_lock_irq(¤t->sighand->siglock); | |
292 | if (current->jobctl & JOBCTL_STOP_DEQUEUED) | |
b5bf9a90 | 293 | set_special_state(TASK_STOPPED); |
c3edc401 IM |
294 | spin_unlock_irq(¤t->sighand->siglock); |
295 | ||
296 | schedule(); | |
297 | } | |
f8ec6601 EB |
298 | #ifdef __ARCH_SI_TRAPNO |
299 | # define ___ARCH_SI_TRAPNO(_a1) , _a1 | |
300 | #else | |
301 | # define ___ARCH_SI_TRAPNO(_a1) | |
302 | #endif | |
303 | #ifdef __ia64__ | |
304 | # define ___ARCH_SI_IA64(_a1, _a2, _a3) , _a1, _a2, _a3 | |
305 | #else | |
306 | # define ___ARCH_SI_IA64(_a1, _a2, _a3) | |
307 | #endif | |
308 | ||
309 | int force_sig_fault(int sig, int code, void __user *addr | |
310 | ___ARCH_SI_TRAPNO(int trapno) | |
311 | ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr) | |
312 | , struct task_struct *t); | |
313 | int send_sig_fault(int sig, int code, void __user *addr | |
314 | ___ARCH_SI_TRAPNO(int trapno) | |
315 | ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr) | |
316 | , struct task_struct *t); | |
317 | ||
38246735 EB |
318 | int force_sig_mceerr(int code, void __user *, short, struct task_struct *); |
319 | int send_sig_mceerr(int code, void __user *, short, struct task_struct *); | |
320 | ||
321 | int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper); | |
322 | int force_sig_pkuerr(void __user *addr, u32 pkey); | |
323 | ||
f71dd7dc EB |
324 | int force_sig_ptrace_errno_trap(int errno, void __user *addr); |
325 | ||
ae7795bc | 326 | extern int send_sig_info(int, struct kernel_siginfo *, struct task_struct *); |
52cba1a2 | 327 | extern void force_sigsegv(int sig, struct task_struct *p); |
ae7795bc EB |
328 | extern int force_sig_info(int, struct kernel_siginfo *, struct task_struct *); |
329 | extern int __kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp); | |
330 | extern int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid); | |
331 | extern int kill_pid_info_as_cred(int, struct kernel_siginfo *, struct pid *, | |
6b4f3d01 | 332 | const struct cred *); |
c3edc401 IM |
333 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
334 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3edc401 IM |
335 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
336 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); | |
337 | extern void force_sig(int, struct task_struct *); | |
338 | extern int send_sig(int, struct task_struct *, int); | |
339 | extern int zap_other_threads(struct task_struct *p); | |
340 | extern struct sigqueue *sigqueue_alloc(void); | |
341 | extern void sigqueue_free(struct sigqueue *); | |
24122c7f | 342 | extern int send_sigqueue(struct sigqueue *, struct pid *, enum pid_type); |
c3edc401 IM |
343 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
344 | ||
2a1f062a IM |
345 | static inline int restart_syscall(void) |
346 | { | |
347 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
348 | return -ERESTARTNOINTR; | |
349 | } | |
350 | ||
351 | static inline int signal_pending(struct task_struct *p) | |
352 | { | |
353 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
354 | } | |
355 | ||
356 | static inline int __fatal_signal_pending(struct task_struct *p) | |
357 | { | |
358 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
359 | } | |
360 | ||
361 | static inline int fatal_signal_pending(struct task_struct *p) | |
362 | { | |
363 | return signal_pending(p) && __fatal_signal_pending(p); | |
364 | } | |
365 | ||
366 | static inline int signal_pending_state(long state, struct task_struct *p) | |
367 | { | |
368 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
369 | return 0; | |
370 | if (!signal_pending(p)) | |
371 | return 0; | |
372 | ||
373 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); | |
374 | } | |
375 | ||
376 | /* | |
377 | * Reevaluate whether the task has signals pending delivery. | |
378 | * Wake the task if so. | |
379 | * This is required every time the blocked sigset_t changes. | |
380 | * callers must hold sighand->siglock. | |
381 | */ | |
382 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
383 | extern void recalc_sigpending(void); | |
088fe47c | 384 | extern void calculate_sigpending(void); |
2a1f062a IM |
385 | |
386 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); | |
387 | ||
388 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
389 | { | |
390 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
391 | } | |
392 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
393 | { | |
394 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
395 | } | |
396 | ||
924de3b8 EB |
397 | void task_join_group_stop(struct task_struct *task); |
398 | ||
c3edc401 IM |
399 | #ifdef TIF_RESTORE_SIGMASK |
400 | /* | |
401 | * Legacy restore_sigmask accessors. These are inefficient on | |
402 | * SMP architectures because they require atomic operations. | |
403 | */ | |
404 | ||
405 | /** | |
406 | * set_restore_sigmask() - make sure saved_sigmask processing gets done | |
407 | * | |
408 | * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code | |
409 | * will run before returning to user mode, to process the flag. For | |
410 | * all callers, TIF_SIGPENDING is already set or it's no harm to set | |
411 | * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the | |
412 | * arch code will notice on return to user mode, in case those bits | |
413 | * are scarce. We set TIF_SIGPENDING here to ensure that the arch | |
414 | * signal code always gets run when TIF_RESTORE_SIGMASK is set. | |
415 | */ | |
416 | static inline void set_restore_sigmask(void) | |
417 | { | |
418 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
419 | WARN_ON(!test_thread_flag(TIF_SIGPENDING)); | |
420 | } | |
fcfc2aa0 AV |
421 | |
422 | static inline void clear_tsk_restore_sigmask(struct task_struct *tsk) | |
423 | { | |
424 | clear_tsk_thread_flag(tsk, TIF_RESTORE_SIGMASK); | |
425 | } | |
426 | ||
c3edc401 IM |
427 | static inline void clear_restore_sigmask(void) |
428 | { | |
429 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
430 | } | |
fcfc2aa0 AV |
431 | static inline bool test_tsk_restore_sigmask(struct task_struct *tsk) |
432 | { | |
433 | return test_tsk_thread_flag(tsk, TIF_RESTORE_SIGMASK); | |
434 | } | |
c3edc401 IM |
435 | static inline bool test_restore_sigmask(void) |
436 | { | |
437 | return test_thread_flag(TIF_RESTORE_SIGMASK); | |
438 | } | |
439 | static inline bool test_and_clear_restore_sigmask(void) | |
440 | { | |
441 | return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); | |
442 | } | |
443 | ||
444 | #else /* TIF_RESTORE_SIGMASK */ | |
445 | ||
446 | /* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */ | |
447 | static inline void set_restore_sigmask(void) | |
448 | { | |
449 | current->restore_sigmask = true; | |
450 | WARN_ON(!test_thread_flag(TIF_SIGPENDING)); | |
451 | } | |
fcfc2aa0 AV |
452 | static inline void clear_tsk_restore_sigmask(struct task_struct *tsk) |
453 | { | |
454 | tsk->restore_sigmask = false; | |
455 | } | |
c3edc401 IM |
456 | static inline void clear_restore_sigmask(void) |
457 | { | |
458 | current->restore_sigmask = false; | |
459 | } | |
460 | static inline bool test_restore_sigmask(void) | |
461 | { | |
462 | return current->restore_sigmask; | |
463 | } | |
fcfc2aa0 AV |
464 | static inline bool test_tsk_restore_sigmask(struct task_struct *tsk) |
465 | { | |
466 | return tsk->restore_sigmask; | |
467 | } | |
c3edc401 IM |
468 | static inline bool test_and_clear_restore_sigmask(void) |
469 | { | |
470 | if (!current->restore_sigmask) | |
471 | return false; | |
472 | current->restore_sigmask = false; | |
473 | return true; | |
474 | } | |
475 | #endif | |
476 | ||
477 | static inline void restore_saved_sigmask(void) | |
478 | { | |
479 | if (test_and_clear_restore_sigmask()) | |
480 | __set_current_blocked(¤t->saved_sigmask); | |
481 | } | |
482 | ||
483 | static inline sigset_t *sigmask_to_save(void) | |
484 | { | |
485 | sigset_t *res = ¤t->blocked; | |
486 | if (unlikely(test_restore_sigmask())) | |
487 | res = ¤t->saved_sigmask; | |
488 | return res; | |
489 | } | |
490 | ||
491 | static inline int kill_cad_pid(int sig, int priv) | |
492 | { | |
493 | return kill_pid(cad_pid, sig, priv); | |
494 | } | |
495 | ||
496 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ | |
ae7795bc EB |
497 | #define SEND_SIG_NOINFO ((struct kernel_siginfo *) 0) |
498 | #define SEND_SIG_PRIV ((struct kernel_siginfo *) 1) | |
c3edc401 IM |
499 | |
500 | /* | |
501 | * True if we are on the alternate signal stack. | |
502 | */ | |
503 | static inline int on_sig_stack(unsigned long sp) | |
504 | { | |
505 | /* | |
506 | * If the signal stack is SS_AUTODISARM then, by construction, we | |
507 | * can't be on the signal stack unless user code deliberately set | |
508 | * SS_AUTODISARM when we were already on it. | |
509 | * | |
510 | * This improves reliability: if user state gets corrupted such that | |
511 | * the stack pointer points very close to the end of the signal stack, | |
512 | * then this check will enable the signal to be handled anyway. | |
513 | */ | |
514 | if (current->sas_ss_flags & SS_AUTODISARM) | |
515 | return 0; | |
516 | ||
517 | #ifdef CONFIG_STACK_GROWSUP | |
518 | return sp >= current->sas_ss_sp && | |
519 | sp - current->sas_ss_sp < current->sas_ss_size; | |
520 | #else | |
521 | return sp > current->sas_ss_sp && | |
522 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
523 | #endif | |
524 | } | |
525 | ||
526 | static inline int sas_ss_flags(unsigned long sp) | |
527 | { | |
528 | if (!current->sas_ss_size) | |
529 | return SS_DISABLE; | |
530 | ||
531 | return on_sig_stack(sp) ? SS_ONSTACK : 0; | |
532 | } | |
533 | ||
534 | static inline void sas_ss_reset(struct task_struct *p) | |
535 | { | |
536 | p->sas_ss_sp = 0; | |
537 | p->sas_ss_size = 0; | |
538 | p->sas_ss_flags = SS_DISABLE; | |
539 | } | |
540 | ||
541 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) | |
542 | { | |
543 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
544 | #ifdef CONFIG_STACK_GROWSUP | |
545 | return current->sas_ss_sp; | |
546 | #else | |
547 | return current->sas_ss_sp + current->sas_ss_size; | |
548 | #endif | |
549 | return sp; | |
550 | } | |
551 | ||
552 | extern void __cleanup_sighand(struct sighand_struct *); | |
553 | extern void flush_itimer_signals(void); | |
554 | ||
555 | #define tasklist_empty() \ | |
556 | list_empty(&init_task.tasks) | |
557 | ||
558 | #define next_task(p) \ | |
559 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
560 | ||
561 | #define for_each_process(p) \ | |
562 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
563 | ||
564 | extern bool current_is_single_threaded(void); | |
565 | ||
566 | /* | |
567 | * Careful: do_each_thread/while_each_thread is a double loop so | |
568 | * 'break' will not work as expected - use goto instead. | |
569 | */ | |
570 | #define do_each_thread(g, t) \ | |
571 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
572 | ||
573 | #define while_each_thread(g, t) \ | |
574 | while ((t = next_thread(t)) != g) | |
575 | ||
576 | #define __for_each_thread(signal, t) \ | |
577 | list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) | |
578 | ||
579 | #define for_each_thread(p, t) \ | |
580 | __for_each_thread((p)->signal, t) | |
581 | ||
582 | /* Careful: this is a double loop, 'break' won't work as expected. */ | |
583 | #define for_each_process_thread(p, t) \ | |
584 | for_each_process(p) for_each_thread(p, t) | |
585 | ||
586 | typedef int (*proc_visitor)(struct task_struct *p, void *data); | |
587 | void walk_process_tree(struct task_struct *top, proc_visitor, void *); | |
588 | ||
1fb53567 EB |
589 | static inline |
590 | struct pid *task_pid_type(struct task_struct *task, enum pid_type type) | |
591 | { | |
2c470475 EB |
592 | struct pid *pid; |
593 | if (type == PIDTYPE_PID) | |
594 | pid = task_pid(task); | |
595 | else | |
596 | pid = task->signal->pids[type]; | |
597 | return pid; | |
1fb53567 EB |
598 | } |
599 | ||
7a36094d EB |
600 | static inline struct pid *task_tgid(struct task_struct *task) |
601 | { | |
6883f81a | 602 | return task->signal->pids[PIDTYPE_TGID]; |
7a36094d EB |
603 | } |
604 | ||
2c470475 EB |
605 | /* |
606 | * Without tasklist or RCU lock it is not safe to dereference | |
607 | * the result of task_pgrp/task_session even if task == current, | |
608 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
609 | */ | |
610 | static inline struct pid *task_pgrp(struct task_struct *task) | |
611 | { | |
612 | return task->signal->pids[PIDTYPE_PGID]; | |
613 | } | |
614 | ||
615 | static inline struct pid *task_session(struct task_struct *task) | |
616 | { | |
617 | return task->signal->pids[PIDTYPE_SID]; | |
618 | } | |
619 | ||
c3edc401 IM |
620 | static inline int get_nr_threads(struct task_struct *tsk) |
621 | { | |
622 | return tsk->signal->nr_threads; | |
623 | } | |
624 | ||
625 | static inline bool thread_group_leader(struct task_struct *p) | |
626 | { | |
627 | return p->exit_signal >= 0; | |
628 | } | |
629 | ||
630 | /* Do to the insanities of de_thread it is possible for a process | |
631 | * to have the pid of the thread group leader without actually being | |
632 | * the thread group leader. For iteration through the pids in proc | |
633 | * all we care about is that we have a task with the appropriate | |
634 | * pid, we don't actually care if we have the right task. | |
635 | */ | |
636 | static inline bool has_group_leader_pid(struct task_struct *p) | |
637 | { | |
6883f81a | 638 | return task_pid(p) == task_tgid(p); |
c3edc401 IM |
639 | } |
640 | ||
641 | static inline | |
642 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
643 | { | |
644 | return p1->signal == p2->signal; | |
645 | } | |
646 | ||
647 | static inline struct task_struct *next_thread(const struct task_struct *p) | |
648 | { | |
649 | return list_entry_rcu(p->thread_group.next, | |
650 | struct task_struct, thread_group); | |
651 | } | |
652 | ||
653 | static inline int thread_group_empty(struct task_struct *p) | |
654 | { | |
655 | return list_empty(&p->thread_group); | |
656 | } | |
657 | ||
658 | #define delay_group_leader(p) \ | |
659 | (thread_group_leader(p) && !thread_group_empty(p)) | |
660 | ||
661 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, | |
662 | unsigned long *flags); | |
663 | ||
664 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, | |
665 | unsigned long *flags) | |
666 | { | |
667 | struct sighand_struct *ret; | |
668 | ||
669 | ret = __lock_task_sighand(tsk, flags); | |
670 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
671 | return ret; | |
672 | } | |
673 | ||
674 | static inline void unlock_task_sighand(struct task_struct *tsk, | |
675 | unsigned long *flags) | |
676 | { | |
677 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
678 | } | |
679 | ||
680 | static inline unsigned long task_rlimit(const struct task_struct *tsk, | |
681 | unsigned int limit) | |
682 | { | |
683 | return READ_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
684 | } | |
685 | ||
686 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
687 | unsigned int limit) | |
688 | { | |
689 | return READ_ONCE(tsk->signal->rlim[limit].rlim_max); | |
690 | } | |
691 | ||
692 | static inline unsigned long rlimit(unsigned int limit) | |
693 | { | |
694 | return task_rlimit(current, limit); | |
695 | } | |
696 | ||
697 | static inline unsigned long rlimit_max(unsigned int limit) | |
698 | { | |
699 | return task_rlimit_max(current, limit); | |
700 | } | |
701 | ||
3f07c014 | 702 | #endif /* _LINUX_SCHED_SIGNAL_H */ |