FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_time.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)kern_time.c 8.1 (Berkeley) 6/10/93
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/12.0/sys/kern/kern_time.c 336914 2018-07-30 15:46:40Z asomers $");
36
37 #include "opt_ktrace.h"
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/limits.h>
42 #include <sys/clock.h>
43 #include <sys/lock.h>
44 #include <sys/mutex.h>
45 #include <sys/sysproto.h>
46 #include <sys/eventhandler.h>
47 #include <sys/resourcevar.h>
48 #include <sys/signalvar.h>
49 #include <sys/kernel.h>
50 #include <sys/sleepqueue.h>
51 #include <sys/syscallsubr.h>
52 #include <sys/sysctl.h>
53 #include <sys/sysent.h>
54 #include <sys/priv.h>
55 #include <sys/proc.h>
56 #include <sys/posix4.h>
57 #include <sys/time.h>
58 #include <sys/timers.h>
59 #include <sys/timetc.h>
60 #include <sys/vnode.h>
61 #ifdef KTRACE
62 #include <sys/ktrace.h>
63 #endif
64
65 #include <vm/vm.h>
66 #include <vm/vm_extern.h>
67
68 #define MAX_CLOCKS (CLOCK_MONOTONIC+1)
69 #define CPUCLOCK_BIT 0x80000000
70 #define CPUCLOCK_PROCESS_BIT 0x40000000
71 #define CPUCLOCK_ID_MASK (~(CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT))
72 #define MAKE_THREAD_CPUCLOCK(tid) (CPUCLOCK_BIT|(tid))
73 #define MAKE_PROCESS_CPUCLOCK(pid) \
74 (CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT|(pid))
75
76 static struct kclock posix_clocks[MAX_CLOCKS];
77 static uma_zone_t itimer_zone = NULL;
78
79 /*
80 * Time of day and interval timer support.
81 *
82 * These routines provide the kernel entry points to get and set
83 * the time-of-day and per-process interval timers. Subroutines
84 * here provide support for adding and subtracting timeval structures
85 * and decrementing interval timers, optionally reloading the interval
86 * timers when they expire.
87 */
88
89 static int settime(struct thread *, struct timeval *);
90 static void timevalfix(struct timeval *);
91 static int user_clock_nanosleep(struct thread *td, clockid_t clock_id,
92 int flags, const struct timespec *ua_rqtp,
93 struct timespec *ua_rmtp);
94
95 static void itimer_start(void);
96 static int itimer_init(void *, int, int);
97 static void itimer_fini(void *, int);
98 static void itimer_enter(struct itimer *);
99 static void itimer_leave(struct itimer *);
100 static struct itimer *itimer_find(struct proc *, int);
101 static void itimers_alloc(struct proc *);
102 static void itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp);
103 static void itimers_event_hook_exit(void *arg, struct proc *p);
104 static int realtimer_create(struct itimer *);
105 static int realtimer_gettime(struct itimer *, struct itimerspec *);
106 static int realtimer_settime(struct itimer *, int,
107 struct itimerspec *, struct itimerspec *);
108 static int realtimer_delete(struct itimer *);
109 static void realtimer_clocktime(clockid_t, struct timespec *);
110 static void realtimer_expire(void *);
111
112 int register_posix_clock(int, struct kclock *);
113 void itimer_fire(struct itimer *it);
114 int itimespecfix(struct timespec *ts);
115
116 #define CLOCK_CALL(clock, call, arglist) \
117 ((*posix_clocks[clock].call) arglist)
118
119 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL);
120
121
122 static int
123 settime(struct thread *td, struct timeval *tv)
124 {
125 struct timeval delta, tv1, tv2;
126 static struct timeval maxtime, laststep;
127 struct timespec ts;
128
129 microtime(&tv1);
130 delta = *tv;
131 timevalsub(&delta, &tv1);
132
133 /*
134 * If the system is secure, we do not allow the time to be
135 * set to a value earlier than 1 second less than the highest
136 * time we have yet seen. The worst a miscreant can do in
137 * this circumstance is "freeze" time. He couldn't go
138 * back to the past.
139 *
140 * We similarly do not allow the clock to be stepped more
141 * than one second, nor more than once per second. This allows
142 * a miscreant to make the clock march double-time, but no worse.
143 */
144 if (securelevel_gt(td->td_ucred, 1) != 0) {
145 if (delta.tv_sec < 0 || delta.tv_usec < 0) {
146 /*
147 * Update maxtime to latest time we've seen.
148 */
149 if (tv1.tv_sec > maxtime.tv_sec)
150 maxtime = tv1;
151 tv2 = *tv;
152 timevalsub(&tv2, &maxtime);
153 if (tv2.tv_sec < -1) {
154 tv->tv_sec = maxtime.tv_sec - 1;
155 printf("Time adjustment clamped to -1 second\n");
156 }
157 } else {
158 if (tv1.tv_sec == laststep.tv_sec)
159 return (EPERM);
160 if (delta.tv_sec > 1) {
161 tv->tv_sec = tv1.tv_sec + 1;
162 printf("Time adjustment clamped to +1 second\n");
163 }
164 laststep = *tv;
165 }
166 }
167
168 ts.tv_sec = tv->tv_sec;
169 ts.tv_nsec = tv->tv_usec * 1000;
170 tc_setclock(&ts);
171 resettodr();
172 return (0);
173 }
174
175 #ifndef _SYS_SYSPROTO_H_
176 struct clock_getcpuclockid2_args {
177 id_t id;
178 int which,
179 clockid_t *clock_id;
180 };
181 #endif
182 /* ARGSUSED */
183 int
184 sys_clock_getcpuclockid2(struct thread *td, struct clock_getcpuclockid2_args *uap)
185 {
186 clockid_t clk_id;
187 int error;
188
189 error = kern_clock_getcpuclockid2(td, uap->id, uap->which, &clk_id);
190 if (error == 0)
191 error = copyout(&clk_id, uap->clock_id, sizeof(clockid_t));
192 return (error);
193 }
194
195 int
196 kern_clock_getcpuclockid2(struct thread *td, id_t id, int which,
197 clockid_t *clk_id)
198 {
199 struct proc *p;
200 pid_t pid;
201 lwpid_t tid;
202 int error;
203
204 switch (which) {
205 case CPUCLOCK_WHICH_PID:
206 if (id != 0) {
207 error = pget(id, PGET_CANSEE | PGET_NOTID, &p);
208 if (error != 0)
209 return (error);
210 PROC_UNLOCK(p);
211 pid = id;
212 } else {
213 pid = td->td_proc->p_pid;
214 }
215 *clk_id = MAKE_PROCESS_CPUCLOCK(pid);
216 return (0);
217 case CPUCLOCK_WHICH_TID:
218 tid = id == 0 ? td->td_tid : id;
219 *clk_id = MAKE_THREAD_CPUCLOCK(tid);
220 return (0);
221 default:
222 return (EINVAL);
223 }
224 }
225
226 #ifndef _SYS_SYSPROTO_H_
227 struct clock_gettime_args {
228 clockid_t clock_id;
229 struct timespec *tp;
230 };
231 #endif
232 /* ARGSUSED */
233 int
234 sys_clock_gettime(struct thread *td, struct clock_gettime_args *uap)
235 {
236 struct timespec ats;
237 int error;
238
239 error = kern_clock_gettime(td, uap->clock_id, &ats);
240 if (error == 0)
241 error = copyout(&ats, uap->tp, sizeof(ats));
242
243 return (error);
244 }
245
246 static inline void
247 cputick2timespec(uint64_t runtime, struct timespec *ats)
248 {
249 runtime = cputick2usec(runtime);
250 ats->tv_sec = runtime / 1000000;
251 ats->tv_nsec = runtime % 1000000 * 1000;
252 }
253
254 static void
255 get_thread_cputime(struct thread *targettd, struct timespec *ats)
256 {
257 uint64_t runtime, curtime, switchtime;
258
259 if (targettd == NULL) { /* current thread */
260 critical_enter();
261 switchtime = PCPU_GET(switchtime);
262 curtime = cpu_ticks();
263 runtime = curthread->td_runtime;
264 critical_exit();
265 runtime += curtime - switchtime;
266 } else {
267 thread_lock(targettd);
268 runtime = targettd->td_runtime;
269 thread_unlock(targettd);
270 }
271 cputick2timespec(runtime, ats);
272 }
273
274 static void
275 get_process_cputime(struct proc *targetp, struct timespec *ats)
276 {
277 uint64_t runtime;
278 struct rusage ru;
279
280 PROC_STATLOCK(targetp);
281 rufetch(targetp, &ru);
282 runtime = targetp->p_rux.rux_runtime;
283 if (curthread->td_proc == targetp)
284 runtime += cpu_ticks() - PCPU_GET(switchtime);
285 PROC_STATUNLOCK(targetp);
286 cputick2timespec(runtime, ats);
287 }
288
289 static int
290 get_cputime(struct thread *td, clockid_t clock_id, struct timespec *ats)
291 {
292 struct proc *p, *p2;
293 struct thread *td2;
294 lwpid_t tid;
295 pid_t pid;
296 int error;
297
298 p = td->td_proc;
299 if ((clock_id & CPUCLOCK_PROCESS_BIT) == 0) {
300 tid = clock_id & CPUCLOCK_ID_MASK;
301 td2 = tdfind(tid, p->p_pid);
302 if (td2 == NULL)
303 return (EINVAL);
304 get_thread_cputime(td2, ats);
305 PROC_UNLOCK(td2->td_proc);
306 } else {
307 pid = clock_id & CPUCLOCK_ID_MASK;
308 error = pget(pid, PGET_CANSEE, &p2);
309 if (error != 0)
310 return (EINVAL);
311 get_process_cputime(p2, ats);
312 PROC_UNLOCK(p2);
313 }
314 return (0);
315 }
316
317 int
318 kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
319 {
320 struct timeval sys, user;
321 struct proc *p;
322
323 p = td->td_proc;
324 switch (clock_id) {
325 case CLOCK_REALTIME: /* Default to precise. */
326 case CLOCK_REALTIME_PRECISE:
327 nanotime(ats);
328 break;
329 case CLOCK_REALTIME_FAST:
330 getnanotime(ats);
331 break;
332 case CLOCK_VIRTUAL:
333 PROC_LOCK(p);
334 PROC_STATLOCK(p);
335 calcru(p, &user, &sys);
336 PROC_STATUNLOCK(p);
337 PROC_UNLOCK(p);
338 TIMEVAL_TO_TIMESPEC(&user, ats);
339 break;
340 case CLOCK_PROF:
341 PROC_LOCK(p);
342 PROC_STATLOCK(p);
343 calcru(p, &user, &sys);
344 PROC_STATUNLOCK(p);
345 PROC_UNLOCK(p);
346 timevaladd(&user, &sys);
347 TIMEVAL_TO_TIMESPEC(&user, ats);
348 break;
349 case CLOCK_MONOTONIC: /* Default to precise. */
350 case CLOCK_MONOTONIC_PRECISE:
351 case CLOCK_UPTIME:
352 case CLOCK_UPTIME_PRECISE:
353 nanouptime(ats);
354 break;
355 case CLOCK_UPTIME_FAST:
356 case CLOCK_MONOTONIC_FAST:
357 getnanouptime(ats);
358 break;
359 case CLOCK_SECOND:
360 ats->tv_sec = time_second;
361 ats->tv_nsec = 0;
362 break;
363 case CLOCK_THREAD_CPUTIME_ID:
364 get_thread_cputime(NULL, ats);
365 break;
366 case CLOCK_PROCESS_CPUTIME_ID:
367 PROC_LOCK(p);
368 get_process_cputime(p, ats);
369 PROC_UNLOCK(p);
370 break;
371 default:
372 if ((int)clock_id >= 0)
373 return (EINVAL);
374 return (get_cputime(td, clock_id, ats));
375 }
376 return (0);
377 }
378
379 #ifndef _SYS_SYSPROTO_H_
380 struct clock_settime_args {
381 clockid_t clock_id;
382 const struct timespec *tp;
383 };
384 #endif
385 /* ARGSUSED */
386 int
387 sys_clock_settime(struct thread *td, struct clock_settime_args *uap)
388 {
389 struct timespec ats;
390 int error;
391
392 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0)
393 return (error);
394 return (kern_clock_settime(td, uap->clock_id, &ats));
395 }
396
397 static int allow_insane_settime = 0;
398 SYSCTL_INT(_debug, OID_AUTO, allow_insane_settime, CTLFLAG_RWTUN,
399 &allow_insane_settime, 0,
400 "do not perform possibly restrictive checks on settime(2) args");
401
402 int
403 kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats)
404 {
405 struct timeval atv;
406 int error;
407
408 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0)
409 return (error);
410 if (clock_id != CLOCK_REALTIME)
411 return (EINVAL);
412 if (ats->tv_nsec < 0 || ats->tv_nsec >= 1000000000 ||
413 ats->tv_sec < 0)
414 return (EINVAL);
415 if (!allow_insane_settime && ats->tv_sec > 8000ULL * 365 * 24 * 60 * 60)
416 return (EINVAL);
417 /* XXX Don't convert nsec->usec and back */
418 TIMESPEC_TO_TIMEVAL(&atv, ats);
419 error = settime(td, &atv);
420 return (error);
421 }
422
423 #ifndef _SYS_SYSPROTO_H_
424 struct clock_getres_args {
425 clockid_t clock_id;
426 struct timespec *tp;
427 };
428 #endif
429 int
430 sys_clock_getres(struct thread *td, struct clock_getres_args *uap)
431 {
432 struct timespec ts;
433 int error;
434
435 if (uap->tp == NULL)
436 return (0);
437
438 error = kern_clock_getres(td, uap->clock_id, &ts);
439 if (error == 0)
440 error = copyout(&ts, uap->tp, sizeof(ts));
441 return (error);
442 }
443
444 int
445 kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
446 {
447
448 ts->tv_sec = 0;
449 switch (clock_id) {
450 case CLOCK_REALTIME:
451 case CLOCK_REALTIME_FAST:
452 case CLOCK_REALTIME_PRECISE:
453 case CLOCK_MONOTONIC:
454 case CLOCK_MONOTONIC_FAST:
455 case CLOCK_MONOTONIC_PRECISE:
456 case CLOCK_UPTIME:
457 case CLOCK_UPTIME_FAST:
458 case CLOCK_UPTIME_PRECISE:
459 /*
460 * Round up the result of the division cheaply by adding 1.
461 * Rounding up is especially important if rounding down
462 * would give 0. Perfect rounding is unimportant.
463 */
464 ts->tv_nsec = 1000000000 / tc_getfrequency() + 1;
465 break;
466 case CLOCK_VIRTUAL:
467 case CLOCK_PROF:
468 /* Accurately round up here because we can do so cheaply. */
469 ts->tv_nsec = howmany(1000000000, hz);
470 break;
471 case CLOCK_SECOND:
472 ts->tv_sec = 1;
473 ts->tv_nsec = 0;
474 break;
475 case CLOCK_THREAD_CPUTIME_ID:
476 case CLOCK_PROCESS_CPUTIME_ID:
477 cputime:
478 /* sync with cputick2usec */
479 ts->tv_nsec = 1000000 / cpu_tickrate();
480 if (ts->tv_nsec == 0)
481 ts->tv_nsec = 1000;
482 break;
483 default:
484 if ((int)clock_id < 0)
485 goto cputime;
486 return (EINVAL);
487 }
488 return (0);
489 }
490
491 int
492 kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt)
493 {
494
495 return (kern_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME, rqt,
496 rmt));
497 }
498
499 static uint8_t nanowait[MAXCPU];
500
501 int
502 kern_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags,
503 const struct timespec *rqt, struct timespec *rmt)
504 {
505 struct timespec ts, now;
506 sbintime_t sbt, sbtt, prec, tmp;
507 time_t over;
508 int error;
509 bool is_abs_real;
510
511 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000)
512 return (EINVAL);
513 if ((flags & ~TIMER_ABSTIME) != 0)
514 return (EINVAL);
515 switch (clock_id) {
516 case CLOCK_REALTIME:
517 case CLOCK_REALTIME_PRECISE:
518 case CLOCK_REALTIME_FAST:
519 case CLOCK_SECOND:
520 is_abs_real = (flags & TIMER_ABSTIME) != 0;
521 break;
522 case CLOCK_MONOTONIC:
523 case CLOCK_MONOTONIC_PRECISE:
524 case CLOCK_MONOTONIC_FAST:
525 case CLOCK_UPTIME:
526 case CLOCK_UPTIME_PRECISE:
527 case CLOCK_UPTIME_FAST:
528 is_abs_real = false;
529 break;
530 case CLOCK_VIRTUAL:
531 case CLOCK_PROF:
532 case CLOCK_PROCESS_CPUTIME_ID:
533 return (ENOTSUP);
534 case CLOCK_THREAD_CPUTIME_ID:
535 default:
536 return (EINVAL);
537 }
538 do {
539 ts = *rqt;
540 if ((flags & TIMER_ABSTIME) != 0) {
541 if (is_abs_real)
542 td->td_rtcgen =
543 atomic_load_acq_int(&rtc_generation);
544 error = kern_clock_gettime(td, clock_id, &now);
545 KASSERT(error == 0, ("kern_clock_gettime: %d", error));
546 timespecsub(&ts, &now, &ts);
547 }
548 if (ts.tv_sec < 0 || (ts.tv_sec == 0 && ts.tv_nsec == 0)) {
549 error = EWOULDBLOCK;
550 break;
551 }
552 if (ts.tv_sec > INT32_MAX / 2) {
553 over = ts.tv_sec - INT32_MAX / 2;
554 ts.tv_sec -= over;
555 } else
556 over = 0;
557 tmp = tstosbt(ts);
558 prec = tmp;
559 prec >>= tc_precexp;
560 if (TIMESEL(&sbt, tmp))
561 sbt += tc_tick_sbt;
562 sbt += tmp;
563 error = tsleep_sbt(&nanowait[curcpu], PWAIT | PCATCH, "nanslp",
564 sbt, prec, C_ABSOLUTE);
565 } while (error == 0 && is_abs_real && td->td_rtcgen == 0);
566 td->td_rtcgen = 0;
567 if (error != EWOULDBLOCK) {
568 if (TIMESEL(&sbtt, tmp))
569 sbtt += tc_tick_sbt;
570 if (sbtt >= sbt)
571 return (0);
572 if (error == ERESTART)
573 error = EINTR;
574 if ((flags & TIMER_ABSTIME) == 0 && rmt != NULL) {
575 ts = sbttots(sbt - sbtt);
576 ts.tv_sec += over;
577 if (ts.tv_sec < 0)
578 timespecclear(&ts);
579 *rmt = ts;
580 }
581 return (error);
582 }
583 return (0);
584 }
585
586 #ifndef _SYS_SYSPROTO_H_
587 struct nanosleep_args {
588 struct timespec *rqtp;
589 struct timespec *rmtp;
590 };
591 #endif
592 /* ARGSUSED */
593 int
594 sys_nanosleep(struct thread *td, struct nanosleep_args *uap)
595 {
596
597 return (user_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME,
598 uap->rqtp, uap->rmtp));
599 }
600
601 #ifndef _SYS_SYSPROTO_H_
602 struct clock_nanosleep_args {
603 clockid_t clock_id;
604 int flags;
605 struct timespec *rqtp;
606 struct timespec *rmtp;
607 };
608 #endif
609 /* ARGSUSED */
610 int
611 sys_clock_nanosleep(struct thread *td, struct clock_nanosleep_args *uap)
612 {
613 int error;
614
615 error = user_clock_nanosleep(td, uap->clock_id, uap->flags, uap->rqtp,
616 uap->rmtp);
617 return (kern_posix_error(td, error));
618 }
619
620 static int
621 user_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags,
622 const struct timespec *ua_rqtp, struct timespec *ua_rmtp)
623 {
624 struct timespec rmt, rqt;
625 int error;
626
627 error = copyin(ua_rqtp, &rqt, sizeof(rqt));
628 if (error)
629 return (error);
630 if (ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0 &&
631 !useracc(ua_rmtp, sizeof(rmt), VM_PROT_WRITE))
632 return (EFAULT);
633 error = kern_clock_nanosleep(td, clock_id, flags, &rqt, &rmt);
634 if (error == EINTR && ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0) {
635 int error2;
636
637 error2 = copyout(&rmt, ua_rmtp, sizeof(rmt));
638 if (error2)
639 error = error2;
640 }
641 return (error);
642 }
643
644 #ifndef _SYS_SYSPROTO_H_
645 struct gettimeofday_args {
646 struct timeval *tp;
647 struct timezone *tzp;
648 };
649 #endif
650 /* ARGSUSED */
651 int
652 sys_gettimeofday(struct thread *td, struct gettimeofday_args *uap)
653 {
654 struct timeval atv;
655 struct timezone rtz;
656 int error = 0;
657
658 if (uap->tp) {
659 microtime(&atv);
660 error = copyout(&atv, uap->tp, sizeof (atv));
661 }
662 if (error == 0 && uap->tzp != NULL) {
663 rtz.tz_minuteswest = tz_minuteswest;
664 rtz.tz_dsttime = tz_dsttime;
665 error = copyout(&rtz, uap->tzp, sizeof (rtz));
666 }
667 return (error);
668 }
669
670 #ifndef _SYS_SYSPROTO_H_
671 struct settimeofday_args {
672 struct timeval *tv;
673 struct timezone *tzp;
674 };
675 #endif
676 /* ARGSUSED */
677 int
678 sys_settimeofday(struct thread *td, struct settimeofday_args *uap)
679 {
680 struct timeval atv, *tvp;
681 struct timezone atz, *tzp;
682 int error;
683
684 if (uap->tv) {
685 error = copyin(uap->tv, &atv, sizeof(atv));
686 if (error)
687 return (error);
688 tvp = &atv;
689 } else
690 tvp = NULL;
691 if (uap->tzp) {
692 error = copyin(uap->tzp, &atz, sizeof(atz));
693 if (error)
694 return (error);
695 tzp = &atz;
696 } else
697 tzp = NULL;
698 return (kern_settimeofday(td, tvp, tzp));
699 }
700
701 int
702 kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp)
703 {
704 int error;
705
706 error = priv_check(td, PRIV_SETTIMEOFDAY);
707 if (error)
708 return (error);
709 /* Verify all parameters before changing time. */
710 if (tv) {
711 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000 ||
712 tv->tv_sec < 0)
713 return (EINVAL);
714 error = settime(td, tv);
715 }
716 if (tzp && error == 0) {
717 tz_minuteswest = tzp->tz_minuteswest;
718 tz_dsttime = tzp->tz_dsttime;
719 }
720 return (error);
721 }
722
723 /*
724 * Get value of an interval timer. The process virtual and profiling virtual
725 * time timers are kept in the p_stats area, since they can be swapped out.
726 * These are kept internally in the way they are specified externally: in
727 * time until they expire.
728 *
729 * The real time interval timer is kept in the process table slot for the
730 * process, and its value (it_value) is kept as an absolute time rather than
731 * as a delta, so that it is easy to keep periodic real-time signals from
732 * drifting.
733 *
734 * Virtual time timers are processed in the hardclock() routine of
735 * kern_clock.c. The real time timer is processed by a timeout routine,
736 * called from the softclock() routine. Since a callout may be delayed in
737 * real time due to interrupt processing in the system, it is possible for
738 * the real time timeout routine (realitexpire, given below), to be delayed
739 * in real time past when it is supposed to occur. It does not suffice,
740 * therefore, to reload the real timer .it_value from the real time timers
741 * .it_interval. Rather, we compute the next time in absolute time the timer
742 * should go off.
743 */
744 #ifndef _SYS_SYSPROTO_H_
745 struct getitimer_args {
746 u_int which;
747 struct itimerval *itv;
748 };
749 #endif
750 int
751 sys_getitimer(struct thread *td, struct getitimer_args *uap)
752 {
753 struct itimerval aitv;
754 int error;
755
756 error = kern_getitimer(td, uap->which, &aitv);
757 if (error != 0)
758 return (error);
759 return (copyout(&aitv, uap->itv, sizeof (struct itimerval)));
760 }
761
762 int
763 kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv)
764 {
765 struct proc *p = td->td_proc;
766 struct timeval ctv;
767
768 if (which > ITIMER_PROF)
769 return (EINVAL);
770
771 if (which == ITIMER_REAL) {
772 /*
773 * Convert from absolute to relative time in .it_value
774 * part of real time timer. If time for real time timer
775 * has passed return 0, else return difference between
776 * current time and time for the timer to go off.
777 */
778 PROC_LOCK(p);
779 *aitv = p->p_realtimer;
780 PROC_UNLOCK(p);
781 if (timevalisset(&aitv->it_value)) {
782 microuptime(&ctv);
783 if (timevalcmp(&aitv->it_value, &ctv, <))
784 timevalclear(&aitv->it_value);
785 else
786 timevalsub(&aitv->it_value, &ctv);
787 }
788 } else {
789 PROC_ITIMLOCK(p);
790 *aitv = p->p_stats->p_timer[which];
791 PROC_ITIMUNLOCK(p);
792 }
793 #ifdef KTRACE
794 if (KTRPOINT(td, KTR_STRUCT))
795 ktritimerval(aitv);
796 #endif
797 return (0);
798 }
799
800 #ifndef _SYS_SYSPROTO_H_
801 struct setitimer_args {
802 u_int which;
803 struct itimerval *itv, *oitv;
804 };
805 #endif
806 int
807 sys_setitimer(struct thread *td, struct setitimer_args *uap)
808 {
809 struct itimerval aitv, oitv;
810 int error;
811
812 if (uap->itv == NULL) {
813 uap->itv = uap->oitv;
814 return (sys_getitimer(td, (struct getitimer_args *)uap));
815 }
816
817 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval))))
818 return (error);
819 error = kern_setitimer(td, uap->which, &aitv, &oitv);
820 if (error != 0 || uap->oitv == NULL)
821 return (error);
822 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval)));
823 }
824
825 int
826 kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv,
827 struct itimerval *oitv)
828 {
829 struct proc *p = td->td_proc;
830 struct timeval ctv;
831 sbintime_t sbt, pr;
832
833 if (aitv == NULL)
834 return (kern_getitimer(td, which, oitv));
835
836 if (which > ITIMER_PROF)
837 return (EINVAL);
838 #ifdef KTRACE
839 if (KTRPOINT(td, KTR_STRUCT))
840 ktritimerval(aitv);
841 #endif
842 if (itimerfix(&aitv->it_value) ||
843 aitv->it_value.tv_sec > INT32_MAX / 2)
844 return (EINVAL);
845 if (!timevalisset(&aitv->it_value))
846 timevalclear(&aitv->it_interval);
847 else if (itimerfix(&aitv->it_interval) ||
848 aitv->it_interval.tv_sec > INT32_MAX / 2)
849 return (EINVAL);
850
851 if (which == ITIMER_REAL) {
852 PROC_LOCK(p);
853 if (timevalisset(&p->p_realtimer.it_value))
854 callout_stop(&p->p_itcallout);
855 microuptime(&ctv);
856 if (timevalisset(&aitv->it_value)) {
857 pr = tvtosbt(aitv->it_value) >> tc_precexp;
858 timevaladd(&aitv->it_value, &ctv);
859 sbt = tvtosbt(aitv->it_value);
860 callout_reset_sbt(&p->p_itcallout, sbt, pr,
861 realitexpire, p, C_ABSOLUTE);
862 }
863 *oitv = p->p_realtimer;
864 p->p_realtimer = *aitv;
865 PROC_UNLOCK(p);
866 if (timevalisset(&oitv->it_value)) {
867 if (timevalcmp(&oitv->it_value, &ctv, <))
868 timevalclear(&oitv->it_value);
869 else
870 timevalsub(&oitv->it_value, &ctv);
871 }
872 } else {
873 if (aitv->it_interval.tv_sec == 0 &&
874 aitv->it_interval.tv_usec != 0 &&
875 aitv->it_interval.tv_usec < tick)
876 aitv->it_interval.tv_usec = tick;
877 if (aitv->it_value.tv_sec == 0 &&
878 aitv->it_value.tv_usec != 0 &&
879 aitv->it_value.tv_usec < tick)
880 aitv->it_value.tv_usec = tick;
881 PROC_ITIMLOCK(p);
882 *oitv = p->p_stats->p_timer[which];
883 p->p_stats->p_timer[which] = *aitv;
884 PROC_ITIMUNLOCK(p);
885 }
886 #ifdef KTRACE
887 if (KTRPOINT(td, KTR_STRUCT))
888 ktritimerval(oitv);
889 #endif
890 return (0);
891 }
892
893 /*
894 * Real interval timer expired:
895 * send process whose timer expired an alarm signal.
896 * If time is not set up to reload, then just return.
897 * Else compute next time timer should go off which is > current time.
898 * This is where delay in processing this timeout causes multiple
899 * SIGALRM calls to be compressed into one.
900 * tvtohz() always adds 1 to allow for the time until the next clock
901 * interrupt being strictly less than 1 clock tick, but we don't want
902 * that here since we want to appear to be in sync with the clock
903 * interrupt even when we're delayed.
904 */
905 void
906 realitexpire(void *arg)
907 {
908 struct proc *p;
909 struct timeval ctv;
910 sbintime_t isbt;
911
912 p = (struct proc *)arg;
913 kern_psignal(p, SIGALRM);
914 if (!timevalisset(&p->p_realtimer.it_interval)) {
915 timevalclear(&p->p_realtimer.it_value);
916 if (p->p_flag & P_WEXIT)
917 wakeup(&p->p_itcallout);
918 return;
919 }
920 isbt = tvtosbt(p->p_realtimer.it_interval);
921 if (isbt >= sbt_timethreshold)
922 getmicrouptime(&ctv);
923 else
924 microuptime(&ctv);
925 do {
926 timevaladd(&p->p_realtimer.it_value,
927 &p->p_realtimer.it_interval);
928 } while (timevalcmp(&p->p_realtimer.it_value, &ctv, <=));
929 callout_reset_sbt(&p->p_itcallout, tvtosbt(p->p_realtimer.it_value),
930 isbt >> tc_precexp, realitexpire, p, C_ABSOLUTE);
931 }
932
933 /*
934 * Check that a proposed value to load into the .it_value or
935 * .it_interval part of an interval timer is acceptable, and
936 * fix it to have at least minimal value (i.e. if it is less
937 * than the resolution of the clock, round it up.)
938 */
939 int
940 itimerfix(struct timeval *tv)
941 {
942
943 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000)
944 return (EINVAL);
945 if (tv->tv_sec == 0 && tv->tv_usec != 0 &&
946 tv->tv_usec < (u_int)tick / 16)
947 tv->tv_usec = (u_int)tick / 16;
948 return (0);
949 }
950
951 /*
952 * Decrement an interval timer by a specified number
953 * of microseconds, which must be less than a second,
954 * i.e. < 1000000. If the timer expires, then reload
955 * it. In this case, carry over (usec - old value) to
956 * reduce the value reloaded into the timer so that
957 * the timer does not drift. This routine assumes
958 * that it is called in a context where the timers
959 * on which it is operating cannot change in value.
960 */
961 int
962 itimerdecr(struct itimerval *itp, int usec)
963 {
964
965 if (itp->it_value.tv_usec < usec) {
966 if (itp->it_value.tv_sec == 0) {
967 /* expired, and already in next interval */
968 usec -= itp->it_value.tv_usec;
969 goto expire;
970 }
971 itp->it_value.tv_usec += 1000000;
972 itp->it_value.tv_sec--;
973 }
974 itp->it_value.tv_usec -= usec;
975 usec = 0;
976 if (timevalisset(&itp->it_value))
977 return (1);
978 /* expired, exactly at end of interval */
979 expire:
980 if (timevalisset(&itp->it_interval)) {
981 itp->it_value = itp->it_interval;
982 itp->it_value.tv_usec -= usec;
983 if (itp->it_value.tv_usec < 0) {
984 itp->it_value.tv_usec += 1000000;
985 itp->it_value.tv_sec--;
986 }
987 } else
988 itp->it_value.tv_usec = 0; /* sec is already 0 */
989 return (0);
990 }
991
992 /*
993 * Add and subtract routines for timevals.
994 * N.B.: subtract routine doesn't deal with
995 * results which are before the beginning,
996 * it just gets very confused in this case.
997 * Caveat emptor.
998 */
999 void
1000 timevaladd(struct timeval *t1, const struct timeval *t2)
1001 {
1002
1003 t1->tv_sec += t2->tv_sec;
1004 t1->tv_usec += t2->tv_usec;
1005 timevalfix(t1);
1006 }
1007
1008 void
1009 timevalsub(struct timeval *t1, const struct timeval *t2)
1010 {
1011
1012 t1->tv_sec -= t2->tv_sec;
1013 t1->tv_usec -= t2->tv_usec;
1014 timevalfix(t1);
1015 }
1016
1017 static void
1018 timevalfix(struct timeval *t1)
1019 {
1020
1021 if (t1->tv_usec < 0) {
1022 t1->tv_sec--;
1023 t1->tv_usec += 1000000;
1024 }
1025 if (t1->tv_usec >= 1000000) {
1026 t1->tv_sec++;
1027 t1->tv_usec -= 1000000;
1028 }
1029 }
1030
1031 /*
1032 * ratecheck(): simple time-based rate-limit checking.
1033 */
1034 int
1035 ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
1036 {
1037 struct timeval tv, delta;
1038 int rv = 0;
1039
1040 getmicrouptime(&tv); /* NB: 10ms precision */
1041 delta = tv;
1042 timevalsub(&delta, lasttime);
1043
1044 /*
1045 * check for 0,0 is so that the message will be seen at least once,
1046 * even if interval is huge.
1047 */
1048 if (timevalcmp(&delta, mininterval, >=) ||
1049 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
1050 *lasttime = tv;
1051 rv = 1;
1052 }
1053
1054 return (rv);
1055 }
1056
1057 /*
1058 * ppsratecheck(): packets (or events) per second limitation.
1059 *
1060 * Return 0 if the limit is to be enforced (e.g. the caller
1061 * should drop a packet because of the rate limitation).
1062 *
1063 * maxpps of 0 always causes zero to be returned. maxpps of -1
1064 * always causes 1 to be returned; this effectively defeats rate
1065 * limiting.
1066 *
1067 * Note that we maintain the struct timeval for compatibility
1068 * with other bsd systems. We reuse the storage and just monitor
1069 * clock ticks for minimal overhead.
1070 */
1071 int
1072 ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
1073 {
1074 int now;
1075
1076 /*
1077 * Reset the last time and counter if this is the first call
1078 * or more than a second has passed since the last update of
1079 * lasttime.
1080 */
1081 now = ticks;
1082 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) {
1083 lasttime->tv_sec = now;
1084 *curpps = 1;
1085 return (maxpps != 0);
1086 } else {
1087 (*curpps)++; /* NB: ignore potential overflow */
1088 return (maxpps < 0 || *curpps <= maxpps);
1089 }
1090 }
1091
1092 static void
1093 itimer_start(void)
1094 {
1095 struct kclock rt_clock = {
1096 .timer_create = realtimer_create,
1097 .timer_delete = realtimer_delete,
1098 .timer_settime = realtimer_settime,
1099 .timer_gettime = realtimer_gettime,
1100 .event_hook = NULL
1101 };
1102
1103 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer),
1104 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0);
1105 register_posix_clock(CLOCK_REALTIME, &rt_clock);
1106 register_posix_clock(CLOCK_MONOTONIC, &rt_clock);
1107 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L);
1108 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX);
1109 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX);
1110 EVENTHANDLER_REGISTER(process_exit, itimers_event_hook_exit,
1111 (void *)ITIMER_EV_EXIT, EVENTHANDLER_PRI_ANY);
1112 EVENTHANDLER_REGISTER(process_exec, itimers_event_hook_exec,
1113 (void *)ITIMER_EV_EXEC, EVENTHANDLER_PRI_ANY);
1114 }
1115
1116 int
1117 register_posix_clock(int clockid, struct kclock *clk)
1118 {
1119 if ((unsigned)clockid >= MAX_CLOCKS) {
1120 printf("%s: invalid clockid\n", __func__);
1121 return (0);
1122 }
1123 posix_clocks[clockid] = *clk;
1124 return (1);
1125 }
1126
1127 static int
1128 itimer_init(void *mem, int size, int flags)
1129 {
1130 struct itimer *it;
1131
1132 it = (struct itimer *)mem;
1133 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF);
1134 return (0);
1135 }
1136
1137 static void
1138 itimer_fini(void *mem, int size)
1139 {
1140 struct itimer *it;
1141
1142 it = (struct itimer *)mem;
1143 mtx_destroy(&it->it_mtx);
1144 }
1145
1146 static void
1147 itimer_enter(struct itimer *it)
1148 {
1149
1150 mtx_assert(&it->it_mtx, MA_OWNED);
1151 it->it_usecount++;
1152 }
1153
1154 static void
1155 itimer_leave(struct itimer *it)
1156 {
1157
1158 mtx_assert(&it->it_mtx, MA_OWNED);
1159 KASSERT(it->it_usecount > 0, ("invalid it_usecount"));
1160
1161 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0)
1162 wakeup(it);
1163 }
1164
1165 #ifndef _SYS_SYSPROTO_H_
1166 struct ktimer_create_args {
1167 clockid_t clock_id;
1168 struct sigevent * evp;
1169 int * timerid;
1170 };
1171 #endif
1172 int
1173 sys_ktimer_create(struct thread *td, struct ktimer_create_args *uap)
1174 {
1175 struct sigevent *evp, ev;
1176 int id;
1177 int error;
1178
1179 if (uap->evp == NULL) {
1180 evp = NULL;
1181 } else {
1182 error = copyin(uap->evp, &ev, sizeof(ev));
1183 if (error != 0)
1184 return (error);
1185 evp = &ev;
1186 }
1187 error = kern_ktimer_create(td, uap->clock_id, evp, &id, -1);
1188 if (error == 0) {
1189 error = copyout(&id, uap->timerid, sizeof(int));
1190 if (error != 0)
1191 kern_ktimer_delete(td, id);
1192 }
1193 return (error);
1194 }
1195
1196 int
1197 kern_ktimer_create(struct thread *td, clockid_t clock_id, struct sigevent *evp,
1198 int *timerid, int preset_id)
1199 {
1200 struct proc *p = td->td_proc;
1201 struct itimer *it;
1202 int id;
1203 int error;
1204
1205 if (clock_id < 0 || clock_id >= MAX_CLOCKS)
1206 return (EINVAL);
1207
1208 if (posix_clocks[clock_id].timer_create == NULL)
1209 return (EINVAL);
1210
1211 if (evp != NULL) {
1212 if (evp->sigev_notify != SIGEV_NONE &&
1213 evp->sigev_notify != SIGEV_SIGNAL &&
1214 evp->sigev_notify != SIGEV_THREAD_ID)
1215 return (EINVAL);
1216 if ((evp->sigev_notify == SIGEV_SIGNAL ||
1217 evp->sigev_notify == SIGEV_THREAD_ID) &&
1218 !_SIG_VALID(evp->sigev_signo))
1219 return (EINVAL);
1220 }
1221
1222 if (p->p_itimers == NULL)
1223 itimers_alloc(p);
1224
1225 it = uma_zalloc(itimer_zone, M_WAITOK);
1226 it->it_flags = 0;
1227 it->it_usecount = 0;
1228 it->it_active = 0;
1229 timespecclear(&it->it_time.it_value);
1230 timespecclear(&it->it_time.it_interval);
1231 it->it_overrun = 0;
1232 it->it_overrun_last = 0;
1233 it->it_clockid = clock_id;
1234 it->it_timerid = -1;
1235 it->it_proc = p;
1236 ksiginfo_init(&it->it_ksi);
1237 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT;
1238 error = CLOCK_CALL(clock_id, timer_create, (it));
1239 if (error != 0)
1240 goto out;
1241
1242 PROC_LOCK(p);
1243 if (preset_id != -1) {
1244 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id"));
1245 id = preset_id;
1246 if (p->p_itimers->its_timers[id] != NULL) {
1247 PROC_UNLOCK(p);
1248 error = 0;
1249 goto out;
1250 }
1251 } else {
1252 /*
1253 * Find a free timer slot, skipping those reserved
1254 * for setitimer().
1255 */
1256 for (id = 3; id < TIMER_MAX; id++)
1257 if (p->p_itimers->its_timers[id] == NULL)
1258 break;
1259 if (id == TIMER_MAX) {
1260 PROC_UNLOCK(p);
1261 error = EAGAIN;
1262 goto out;
1263 }
1264 }
1265 it->it_timerid = id;
1266 p->p_itimers->its_timers[id] = it;
1267 if (evp != NULL)
1268 it->it_sigev = *evp;
1269 else {
1270 it->it_sigev.sigev_notify = SIGEV_SIGNAL;
1271 switch (clock_id) {
1272 default:
1273 case CLOCK_REALTIME:
1274 it->it_sigev.sigev_signo = SIGALRM;
1275 break;
1276 case CLOCK_VIRTUAL:
1277 it->it_sigev.sigev_signo = SIGVTALRM;
1278 break;
1279 case CLOCK_PROF:
1280 it->it_sigev.sigev_signo = SIGPROF;
1281 break;
1282 }
1283 it->it_sigev.sigev_value.sival_int = id;
1284 }
1285
1286 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1287 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1288 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo;
1289 it->it_ksi.ksi_code = SI_TIMER;
1290 it->it_ksi.ksi_value = it->it_sigev.sigev_value;
1291 it->it_ksi.ksi_timerid = id;
1292 }
1293 PROC_UNLOCK(p);
1294 *timerid = id;
1295 return (0);
1296
1297 out:
1298 ITIMER_LOCK(it);
1299 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1300 ITIMER_UNLOCK(it);
1301 uma_zfree(itimer_zone, it);
1302 return (error);
1303 }
1304
1305 #ifndef _SYS_SYSPROTO_H_
1306 struct ktimer_delete_args {
1307 int timerid;
1308 };
1309 #endif
1310 int
1311 sys_ktimer_delete(struct thread *td, struct ktimer_delete_args *uap)
1312 {
1313
1314 return (kern_ktimer_delete(td, uap->timerid));
1315 }
1316
1317 static struct itimer *
1318 itimer_find(struct proc *p, int timerid)
1319 {
1320 struct itimer *it;
1321
1322 PROC_LOCK_ASSERT(p, MA_OWNED);
1323 if ((p->p_itimers == NULL) ||
1324 (timerid < 0) || (timerid >= TIMER_MAX) ||
1325 (it = p->p_itimers->its_timers[timerid]) == NULL) {
1326 return (NULL);
1327 }
1328 ITIMER_LOCK(it);
1329 if ((it->it_flags & ITF_DELETING) != 0) {
1330 ITIMER_UNLOCK(it);
1331 it = NULL;
1332 }
1333 return (it);
1334 }
1335
1336 int
1337 kern_ktimer_delete(struct thread *td, int timerid)
1338 {
1339 struct proc *p = td->td_proc;
1340 struct itimer *it;
1341
1342 PROC_LOCK(p);
1343 it = itimer_find(p, timerid);
1344 if (it == NULL) {
1345 PROC_UNLOCK(p);
1346 return (EINVAL);
1347 }
1348 PROC_UNLOCK(p);
1349
1350 it->it_flags |= ITF_DELETING;
1351 while (it->it_usecount > 0) {
1352 it->it_flags |= ITF_WANTED;
1353 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0);
1354 }
1355 it->it_flags &= ~ITF_WANTED;
1356 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1357 ITIMER_UNLOCK(it);
1358
1359 PROC_LOCK(p);
1360 if (KSI_ONQ(&it->it_ksi))
1361 sigqueue_take(&it->it_ksi);
1362 p->p_itimers->its_timers[timerid] = NULL;
1363 PROC_UNLOCK(p);
1364 uma_zfree(itimer_zone, it);
1365 return (0);
1366 }
1367
1368 #ifndef _SYS_SYSPROTO_H_
1369 struct ktimer_settime_args {
1370 int timerid;
1371 int flags;
1372 const struct itimerspec * value;
1373 struct itimerspec * ovalue;
1374 };
1375 #endif
1376 int
1377 sys_ktimer_settime(struct thread *td, struct ktimer_settime_args *uap)
1378 {
1379 struct itimerspec val, oval, *ovalp;
1380 int error;
1381
1382 error = copyin(uap->value, &val, sizeof(val));
1383 if (error != 0)
1384 return (error);
1385 ovalp = uap->ovalue != NULL ? &oval : NULL;
1386 error = kern_ktimer_settime(td, uap->timerid, uap->flags, &val, ovalp);
1387 if (error == 0 && uap->ovalue != NULL)
1388 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp));
1389 return (error);
1390 }
1391
1392 int
1393 kern_ktimer_settime(struct thread *td, int timer_id, int flags,
1394 struct itimerspec *val, struct itimerspec *oval)
1395 {
1396 struct proc *p;
1397 struct itimer *it;
1398 int error;
1399
1400 p = td->td_proc;
1401 PROC_LOCK(p);
1402 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1403 PROC_UNLOCK(p);
1404 error = EINVAL;
1405 } else {
1406 PROC_UNLOCK(p);
1407 itimer_enter(it);
1408 error = CLOCK_CALL(it->it_clockid, timer_settime, (it,
1409 flags, val, oval));
1410 itimer_leave(it);
1411 ITIMER_UNLOCK(it);
1412 }
1413 return (error);
1414 }
1415
1416 #ifndef _SYS_SYSPROTO_H_
1417 struct ktimer_gettime_args {
1418 int timerid;
1419 struct itimerspec * value;
1420 };
1421 #endif
1422 int
1423 sys_ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap)
1424 {
1425 struct itimerspec val;
1426 int error;
1427
1428 error = kern_ktimer_gettime(td, uap->timerid, &val);
1429 if (error == 0)
1430 error = copyout(&val, uap->value, sizeof(val));
1431 return (error);
1432 }
1433
1434 int
1435 kern_ktimer_gettime(struct thread *td, int timer_id, struct itimerspec *val)
1436 {
1437 struct proc *p;
1438 struct itimer *it;
1439 int error;
1440
1441 p = td->td_proc;
1442 PROC_LOCK(p);
1443 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1444 PROC_UNLOCK(p);
1445 error = EINVAL;
1446 } else {
1447 PROC_UNLOCK(p);
1448 itimer_enter(it);
1449 error = CLOCK_CALL(it->it_clockid, timer_gettime, (it, val));
1450 itimer_leave(it);
1451 ITIMER_UNLOCK(it);
1452 }
1453 return (error);
1454 }
1455
1456 #ifndef _SYS_SYSPROTO_H_
1457 struct timer_getoverrun_args {
1458 int timerid;
1459 };
1460 #endif
1461 int
1462 sys_ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap)
1463 {
1464
1465 return (kern_ktimer_getoverrun(td, uap->timerid));
1466 }
1467
1468 int
1469 kern_ktimer_getoverrun(struct thread *td, int timer_id)
1470 {
1471 struct proc *p = td->td_proc;
1472 struct itimer *it;
1473 int error ;
1474
1475 PROC_LOCK(p);
1476 if (timer_id < 3 ||
1477 (it = itimer_find(p, timer_id)) == NULL) {
1478 PROC_UNLOCK(p);
1479 error = EINVAL;
1480 } else {
1481 td->td_retval[0] = it->it_overrun_last;
1482 ITIMER_UNLOCK(it);
1483 PROC_UNLOCK(p);
1484 error = 0;
1485 }
1486 return (error);
1487 }
1488
1489 static int
1490 realtimer_create(struct itimer *it)
1491 {
1492 callout_init_mtx(&it->it_callout, &it->it_mtx, 0);
1493 return (0);
1494 }
1495
1496 static int
1497 realtimer_delete(struct itimer *it)
1498 {
1499 mtx_assert(&it->it_mtx, MA_OWNED);
1500
1501 /*
1502 * clear timer's value and interval to tell realtimer_expire
1503 * to not rearm the timer.
1504 */
1505 timespecclear(&it->it_time.it_value);
1506 timespecclear(&it->it_time.it_interval);
1507 ITIMER_UNLOCK(it);
1508 callout_drain(&it->it_callout);
1509 ITIMER_LOCK(it);
1510 return (0);
1511 }
1512
1513 static int
1514 realtimer_gettime(struct itimer *it, struct itimerspec *ovalue)
1515 {
1516 struct timespec cts;
1517
1518 mtx_assert(&it->it_mtx, MA_OWNED);
1519
1520 realtimer_clocktime(it->it_clockid, &cts);
1521 *ovalue = it->it_time;
1522 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) {
1523 timespecsub(&ovalue->it_value, &cts, &ovalue->it_value);
1524 if (ovalue->it_value.tv_sec < 0 ||
1525 (ovalue->it_value.tv_sec == 0 &&
1526 ovalue->it_value.tv_nsec == 0)) {
1527 ovalue->it_value.tv_sec = 0;
1528 ovalue->it_value.tv_nsec = 1;
1529 }
1530 }
1531 return (0);
1532 }
1533
1534 static int
1535 realtimer_settime(struct itimer *it, int flags,
1536 struct itimerspec *value, struct itimerspec *ovalue)
1537 {
1538 struct timespec cts, ts;
1539 struct timeval tv;
1540 struct itimerspec val;
1541
1542 mtx_assert(&it->it_mtx, MA_OWNED);
1543
1544 val = *value;
1545 if (itimespecfix(&val.it_value))
1546 return (EINVAL);
1547
1548 if (timespecisset(&val.it_value)) {
1549 if (itimespecfix(&val.it_interval))
1550 return (EINVAL);
1551 } else {
1552 timespecclear(&val.it_interval);
1553 }
1554
1555 if (ovalue != NULL)
1556 realtimer_gettime(it, ovalue);
1557
1558 it->it_time = val;
1559 if (timespecisset(&val.it_value)) {
1560 realtimer_clocktime(it->it_clockid, &cts);
1561 ts = val.it_value;
1562 if ((flags & TIMER_ABSTIME) == 0) {
1563 /* Convert to absolute time. */
1564 timespecadd(&it->it_time.it_value, &cts,
1565 &it->it_time.it_value);
1566 } else {
1567 timespecsub(&ts, &cts, &ts);
1568 /*
1569 * We don't care if ts is negative, tztohz will
1570 * fix it.
1571 */
1572 }
1573 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1574 callout_reset(&it->it_callout, tvtohz(&tv),
1575 realtimer_expire, it);
1576 } else {
1577 callout_stop(&it->it_callout);
1578 }
1579
1580 return (0);
1581 }
1582
1583 static void
1584 realtimer_clocktime(clockid_t id, struct timespec *ts)
1585 {
1586 if (id == CLOCK_REALTIME)
1587 getnanotime(ts);
1588 else /* CLOCK_MONOTONIC */
1589 getnanouptime(ts);
1590 }
1591
1592 int
1593 itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi)
1594 {
1595 struct itimer *it;
1596
1597 PROC_LOCK_ASSERT(p, MA_OWNED);
1598 it = itimer_find(p, timerid);
1599 if (it != NULL) {
1600 ksi->ksi_overrun = it->it_overrun;
1601 it->it_overrun_last = it->it_overrun;
1602 it->it_overrun = 0;
1603 ITIMER_UNLOCK(it);
1604 return (0);
1605 }
1606 return (EINVAL);
1607 }
1608
1609 int
1610 itimespecfix(struct timespec *ts)
1611 {
1612
1613 if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
1614 return (EINVAL);
1615 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000)
1616 ts->tv_nsec = tick * 1000;
1617 return (0);
1618 }
1619
1620 /* Timeout callback for realtime timer */
1621 static void
1622 realtimer_expire(void *arg)
1623 {
1624 struct timespec cts, ts;
1625 struct timeval tv;
1626 struct itimer *it;
1627
1628 it = (struct itimer *)arg;
1629
1630 realtimer_clocktime(it->it_clockid, &cts);
1631 /* Only fire if time is reached. */
1632 if (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1633 if (timespecisset(&it->it_time.it_interval)) {
1634 timespecadd(&it->it_time.it_value,
1635 &it->it_time.it_interval,
1636 &it->it_time.it_value);
1637 while (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1638 if (it->it_overrun < INT_MAX)
1639 it->it_overrun++;
1640 else
1641 it->it_ksi.ksi_errno = ERANGE;
1642 timespecadd(&it->it_time.it_value,
1643 &it->it_time.it_interval,
1644 &it->it_time.it_value);
1645 }
1646 } else {
1647 /* single shot timer ? */
1648 timespecclear(&it->it_time.it_value);
1649 }
1650 if (timespecisset(&it->it_time.it_value)) {
1651 timespecsub(&it->it_time.it_value, &cts, &ts);
1652 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1653 callout_reset(&it->it_callout, tvtohz(&tv),
1654 realtimer_expire, it);
1655 }
1656 itimer_enter(it);
1657 ITIMER_UNLOCK(it);
1658 itimer_fire(it);
1659 ITIMER_LOCK(it);
1660 itimer_leave(it);
1661 } else if (timespecisset(&it->it_time.it_value)) {
1662 ts = it->it_time.it_value;
1663 timespecsub(&ts, &cts, &ts);
1664 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1665 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire,
1666 it);
1667 }
1668 }
1669
1670 void
1671 itimer_fire(struct itimer *it)
1672 {
1673 struct proc *p = it->it_proc;
1674 struct thread *td;
1675
1676 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1677 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1678 if (sigev_findtd(p, &it->it_sigev, &td) != 0) {
1679 ITIMER_LOCK(it);
1680 timespecclear(&it->it_time.it_value);
1681 timespecclear(&it->it_time.it_interval);
1682 callout_stop(&it->it_callout);
1683 ITIMER_UNLOCK(it);
1684 return;
1685 }
1686 if (!KSI_ONQ(&it->it_ksi)) {
1687 it->it_ksi.ksi_errno = 0;
1688 ksiginfo_set_sigev(&it->it_ksi, &it->it_sigev);
1689 tdsendsignal(p, td, it->it_ksi.ksi_signo, &it->it_ksi);
1690 } else {
1691 if (it->it_overrun < INT_MAX)
1692 it->it_overrun++;
1693 else
1694 it->it_ksi.ksi_errno = ERANGE;
1695 }
1696 PROC_UNLOCK(p);
1697 }
1698 }
1699
1700 static void
1701 itimers_alloc(struct proc *p)
1702 {
1703 struct itimers *its;
1704 int i;
1705
1706 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO);
1707 LIST_INIT(&its->its_virtual);
1708 LIST_INIT(&its->its_prof);
1709 TAILQ_INIT(&its->its_worklist);
1710 for (i = 0; i < TIMER_MAX; i++)
1711 its->its_timers[i] = NULL;
1712 PROC_LOCK(p);
1713 if (p->p_itimers == NULL) {
1714 p->p_itimers = its;
1715 PROC_UNLOCK(p);
1716 }
1717 else {
1718 PROC_UNLOCK(p);
1719 free(its, M_SUBPROC);
1720 }
1721 }
1722
1723 static void
1724 itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp __unused)
1725 {
1726 itimers_event_hook_exit(arg, p);
1727 }
1728
1729 /* Clean up timers when some process events are being triggered. */
1730 static void
1731 itimers_event_hook_exit(void *arg, struct proc *p)
1732 {
1733 struct itimers *its;
1734 struct itimer *it;
1735 int event = (int)(intptr_t)arg;
1736 int i;
1737
1738 if (p->p_itimers != NULL) {
1739 its = p->p_itimers;
1740 for (i = 0; i < MAX_CLOCKS; ++i) {
1741 if (posix_clocks[i].event_hook != NULL)
1742 CLOCK_CALL(i, event_hook, (p, i, event));
1743 }
1744 /*
1745 * According to susv3, XSI interval timers should be inherited
1746 * by new image.
1747 */
1748 if (event == ITIMER_EV_EXEC)
1749 i = 3;
1750 else if (event == ITIMER_EV_EXIT)
1751 i = 0;
1752 else
1753 panic("unhandled event");
1754 for (; i < TIMER_MAX; ++i) {
1755 if ((it = its->its_timers[i]) != NULL)
1756 kern_ktimer_delete(curthread, i);
1757 }
1758 if (its->its_timers[0] == NULL &&
1759 its->its_timers[1] == NULL &&
1760 its->its_timers[2] == NULL) {
1761 free(its, M_SUBPROC);
1762 p->p_itimers = NULL;
1763 }
1764 }
1765 }
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