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