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: releng/7.4/sys/kern/kern_time.c 190301 2009-03-23 00:00:50Z cperciva $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/limits.h>
38 #include <sys/clock.h>
39 #include <sys/lock.h>
40 #include <sys/mutex.h>
41 #include <sys/sysproto.h>
42 #include <sys/eventhandler.h>
43 #include <sys/resourcevar.h>
44 #include <sys/signalvar.h>
45 #include <sys/kernel.h>
46 #include <sys/syscallsubr.h>
47 #include <sys/sysctl.h>
48 #include <sys/sysent.h>
49 #include <sys/priv.h>
50 #include <sys/proc.h>
51 #include <sys/posix4.h>
52 #include <sys/time.h>
53 #include <sys/timers.h>
54 #include <sys/timetc.h>
55 #include <sys/vnode.h>
56
57 #include <vm/vm.h>
58 #include <vm/vm_extern.h>
59
60 #define MAX_CLOCKS (CLOCK_MONOTONIC+1)
61
62 static struct kclock posix_clocks[MAX_CLOCKS];
63 static uma_zone_t itimer_zone = NULL;
64
65 /*
66 * Time of day and interval timer support.
67 *
68 * These routines provide the kernel entry points to get and set
69 * the time-of-day and per-process interval timers. Subroutines
70 * here provide support for adding and subtracting timeval structures
71 * and decrementing interval timers, optionally reloading the interval
72 * timers when they expire.
73 */
74
75 static int settime(struct thread *, struct timeval *);
76 static void timevalfix(struct timeval *);
77 static void no_lease_updatetime(int);
78
79 static void itimer_start(void);
80 static int itimer_init(void *, int, int);
81 static void itimer_fini(void *, int);
82 static void itimer_enter(struct itimer *);
83 static void itimer_leave(struct itimer *);
84 static struct itimer *itimer_find(struct proc *, int);
85 static void itimers_alloc(struct proc *);
86 static void itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp);
87 static void itimers_event_hook_exit(void *arg, struct proc *p);
88 static int realtimer_create(struct itimer *);
89 static int realtimer_gettime(struct itimer *, struct itimerspec *);
90 static int realtimer_settime(struct itimer *, int,
91 struct itimerspec *, struct itimerspec *);
92 static int realtimer_delete(struct itimer *);
93 static void realtimer_clocktime(clockid_t, struct timespec *);
94 static void realtimer_expire(void *);
95 static int kern_timer_create(struct thread *, clockid_t,
96 struct sigevent *, int *, int);
97 static int kern_timer_delete(struct thread *, int);
98
99 int register_posix_clock(int, struct kclock *);
100 void itimer_fire(struct itimer *it);
101 int itimespecfix(struct timespec *ts);
102
103 #define CLOCK_CALL(clock, call, arglist) \
104 ((*posix_clocks[clock].call) arglist)
105
106 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL);
107
108
109 static void
110 no_lease_updatetime(deltat)
111 int deltat;
112 {
113 }
114
115 void (*lease_updatetime)(int) = no_lease_updatetime;
116
117 static int
118 settime(struct thread *td, struct timeval *tv)
119 {
120 struct timeval delta, tv1, tv2;
121 static struct timeval maxtime, laststep;
122 struct timespec ts;
123 int s;
124
125 s = splclock();
126 microtime(&tv1);
127 delta = *tv;
128 timevalsub(&delta, &tv1);
129
130 /*
131 * If the system is secure, we do not allow the time to be
132 * set to a value earlier than 1 second less than the highest
133 * time we have yet seen. The worst a miscreant can do in
134 * this circumstance is "freeze" time. He couldn't go
135 * back to the past.
136 *
137 * We similarly do not allow the clock to be stepped more
138 * than one second, nor more than once per second. This allows
139 * a miscreant to make the clock march double-time, but no worse.
140 */
141 if (securelevel_gt(td->td_ucred, 1) != 0) {
142 if (delta.tv_sec < 0 || delta.tv_usec < 0) {
143 /*
144 * Update maxtime to latest time we've seen.
145 */
146 if (tv1.tv_sec > maxtime.tv_sec)
147 maxtime = tv1;
148 tv2 = *tv;
149 timevalsub(&tv2, &maxtime);
150 if (tv2.tv_sec < -1) {
151 tv->tv_sec = maxtime.tv_sec - 1;
152 printf("Time adjustment clamped to -1 second\n");
153 }
154 } else {
155 if (tv1.tv_sec == laststep.tv_sec) {
156 splx(s);
157 return (EPERM);
158 }
159 if (delta.tv_sec > 1) {
160 tv->tv_sec = tv1.tv_sec + 1;
161 printf("Time adjustment clamped to +1 second\n");
162 }
163 laststep = *tv;
164 }
165 }
166
167 ts.tv_sec = tv->tv_sec;
168 ts.tv_nsec = tv->tv_usec * 1000;
169 mtx_lock(&Giant);
170 tc_setclock(&ts);
171 (void) splsoftclock();
172 lease_updatetime(delta.tv_sec);
173 splx(s);
174 resettodr();
175 mtx_unlock(&Giant);
176 return (0);
177 }
178
179 #ifndef _SYS_SYSPROTO_H_
180 struct clock_gettime_args {
181 clockid_t clock_id;
182 struct timespec *tp;
183 };
184 #endif
185 /* ARGSUSED */
186 int
187 clock_gettime(struct thread *td, struct clock_gettime_args *uap)
188 {
189 struct timespec ats;
190 int error;
191
192 error = kern_clock_gettime(td, uap->clock_id, &ats);
193 if (error == 0)
194 error = copyout(&ats, uap->tp, sizeof(ats));
195
196 return (error);
197 }
198
199 int
200 kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
201 {
202 struct timeval sys, user;
203 struct proc *p;
204 uint64_t runtime, curtime, switchtime;
205
206 p = td->td_proc;
207 switch (clock_id) {
208 case CLOCK_REALTIME: /* Default to precise. */
209 case CLOCK_REALTIME_PRECISE:
210 nanotime(ats);
211 break;
212 case CLOCK_REALTIME_FAST:
213 getnanotime(ats);
214 break;
215 case CLOCK_VIRTUAL:
216 PROC_LOCK(p);
217 PROC_SLOCK(p);
218 calcru(p, &user, &sys);
219 PROC_SUNLOCK(p);
220 PROC_UNLOCK(p);
221 TIMEVAL_TO_TIMESPEC(&user, ats);
222 break;
223 case CLOCK_PROF:
224 PROC_LOCK(p);
225 PROC_SLOCK(p);
226 calcru(p, &user, &sys);
227 PROC_SUNLOCK(p);
228 PROC_UNLOCK(p);
229 timevaladd(&user, &sys);
230 TIMEVAL_TO_TIMESPEC(&user, ats);
231 break;
232 case CLOCK_MONOTONIC: /* Default to precise. */
233 case CLOCK_MONOTONIC_PRECISE:
234 case CLOCK_UPTIME:
235 case CLOCK_UPTIME_PRECISE:
236 nanouptime(ats);
237 break;
238 case CLOCK_UPTIME_FAST:
239 case CLOCK_MONOTONIC_FAST:
240 getnanouptime(ats);
241 break;
242 case CLOCK_SECOND:
243 ats->tv_sec = time_second;
244 ats->tv_nsec = 0;
245 break;
246 case CLOCK_THREAD_CPUTIME_ID:
247 critical_enter();
248 switchtime = PCPU_GET(switchtime);
249 curtime = cpu_ticks();
250 runtime = td->td_runtime;
251 critical_exit();
252 runtime = cputick2usec(runtime + curtime - switchtime);
253 ats->tv_sec = runtime / 1000000;
254 ats->tv_nsec = runtime % 1000000 * 1000;
255 break;
256 default:
257 return (EINVAL);
258 }
259 return (0);
260 }
261
262 #ifndef _SYS_SYSPROTO_H_
263 struct clock_settime_args {
264 clockid_t clock_id;
265 const struct timespec *tp;
266 };
267 #endif
268 /* ARGSUSED */
269 int
270 clock_settime(struct thread *td, struct clock_settime_args *uap)
271 {
272 struct timespec ats;
273 int error;
274
275 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0)
276 return (error);
277 return (kern_clock_settime(td, uap->clock_id, &ats));
278 }
279
280 int
281 kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats)
282 {
283 struct timeval atv;
284 int error;
285
286 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0)
287 return (error);
288 if (clock_id != CLOCK_REALTIME)
289 return (EINVAL);
290 if (ats->tv_nsec < 0 || ats->tv_nsec >= 1000000000)
291 return (EINVAL);
292 /* XXX Don't convert nsec->usec and back */
293 TIMESPEC_TO_TIMEVAL(&atv, ats);
294 error = settime(td, &atv);
295 return (error);
296 }
297
298 #ifndef _SYS_SYSPROTO_H_
299 struct clock_getres_args {
300 clockid_t clock_id;
301 struct timespec *tp;
302 };
303 #endif
304 int
305 clock_getres(struct thread *td, struct clock_getres_args *uap)
306 {
307 struct timespec ts;
308 int error;
309
310 if (uap->tp == NULL)
311 return (0);
312
313 error = kern_clock_getres(td, uap->clock_id, &ts);
314 if (error == 0)
315 error = copyout(&ts, uap->tp, sizeof(ts));
316 return (error);
317 }
318
319 int
320 kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
321 {
322
323 ts->tv_sec = 0;
324 switch (clock_id) {
325 case CLOCK_REALTIME:
326 case CLOCK_REALTIME_FAST:
327 case CLOCK_REALTIME_PRECISE:
328 case CLOCK_MONOTONIC:
329 case CLOCK_MONOTONIC_FAST:
330 case CLOCK_MONOTONIC_PRECISE:
331 case CLOCK_UPTIME:
332 case CLOCK_UPTIME_FAST:
333 case CLOCK_UPTIME_PRECISE:
334 /*
335 * Round up the result of the division cheaply by adding 1.
336 * Rounding up is especially important if rounding down
337 * would give 0. Perfect rounding is unimportant.
338 */
339 ts->tv_nsec = 1000000000 / tc_getfrequency() + 1;
340 break;
341 case CLOCK_VIRTUAL:
342 case CLOCK_PROF:
343 /* Accurately round up here because we can do so cheaply. */
344 ts->tv_nsec = (1000000000 + hz - 1) / hz;
345 break;
346 case CLOCK_SECOND:
347 ts->tv_sec = 1;
348 ts->tv_nsec = 0;
349 break;
350 default:
351 return (EINVAL);
352 }
353 return (0);
354 }
355
356 static int nanowait;
357
358 int
359 kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt)
360 {
361 struct timespec ts, ts2, ts3;
362 struct timeval tv;
363 int error;
364
365 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000)
366 return (EINVAL);
367 if (rqt->tv_sec < 0 || (rqt->tv_sec == 0 && rqt->tv_nsec == 0))
368 return (0);
369 getnanouptime(&ts);
370 timespecadd(&ts, rqt);
371 TIMESPEC_TO_TIMEVAL(&tv, rqt);
372 for (;;) {
373 error = tsleep(&nanowait, PWAIT | PCATCH, "nanslp",
374 tvtohz(&tv));
375 getnanouptime(&ts2);
376 if (error != EWOULDBLOCK) {
377 if (error == ERESTART)
378 error = EINTR;
379 if (rmt != NULL) {
380 timespecsub(&ts, &ts2);
381 if (ts.tv_sec < 0)
382 timespecclear(&ts);
383 *rmt = ts;
384 }
385 return (error);
386 }
387 if (timespeccmp(&ts2, &ts, >=))
388 return (0);
389 ts3 = ts;
390 timespecsub(&ts3, &ts2);
391 TIMESPEC_TO_TIMEVAL(&tv, &ts3);
392 }
393 }
394
395 #ifndef _SYS_SYSPROTO_H_
396 struct nanosleep_args {
397 struct timespec *rqtp;
398 struct timespec *rmtp;
399 };
400 #endif
401 /* ARGSUSED */
402 int
403 nanosleep(struct thread *td, struct nanosleep_args *uap)
404 {
405 struct timespec rmt, rqt;
406 int error;
407
408 error = copyin(uap->rqtp, &rqt, sizeof(rqt));
409 if (error)
410 return (error);
411
412 if (uap->rmtp &&
413 !useracc((caddr_t)uap->rmtp, sizeof(rmt), VM_PROT_WRITE))
414 return (EFAULT);
415 error = kern_nanosleep(td, &rqt, &rmt);
416 if (error && uap->rmtp) {
417 int error2;
418
419 error2 = copyout(&rmt, uap->rmtp, sizeof(rmt));
420 if (error2)
421 error = error2;
422 }
423 return (error);
424 }
425
426 #ifndef _SYS_SYSPROTO_H_
427 struct gettimeofday_args {
428 struct timeval *tp;
429 struct timezone *tzp;
430 };
431 #endif
432 /* ARGSUSED */
433 int
434 gettimeofday(struct thread *td, struct gettimeofday_args *uap)
435 {
436 struct timeval atv;
437 struct timezone rtz;
438 int error = 0;
439
440 if (uap->tp) {
441 microtime(&atv);
442 error = copyout(&atv, uap->tp, sizeof (atv));
443 }
444 if (error == 0 && uap->tzp != NULL) {
445 rtz.tz_minuteswest = tz_minuteswest;
446 rtz.tz_dsttime = tz_dsttime;
447 error = copyout(&rtz, uap->tzp, sizeof (rtz));
448 }
449 return (error);
450 }
451
452 #ifndef _SYS_SYSPROTO_H_
453 struct settimeofday_args {
454 struct timeval *tv;
455 struct timezone *tzp;
456 };
457 #endif
458 /* ARGSUSED */
459 int
460 settimeofday(struct thread *td, struct settimeofday_args *uap)
461 {
462 struct timeval atv, *tvp;
463 struct timezone atz, *tzp;
464 int error;
465
466 if (uap->tv) {
467 error = copyin(uap->tv, &atv, sizeof(atv));
468 if (error)
469 return (error);
470 tvp = &atv;
471 } else
472 tvp = NULL;
473 if (uap->tzp) {
474 error = copyin(uap->tzp, &atz, sizeof(atz));
475 if (error)
476 return (error);
477 tzp = &atz;
478 } else
479 tzp = NULL;
480 return (kern_settimeofday(td, tvp, tzp));
481 }
482
483 int
484 kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp)
485 {
486 int error;
487
488 error = priv_check(td, PRIV_SETTIMEOFDAY);
489 if (error)
490 return (error);
491 /* Verify all parameters before changing time. */
492 if (tv) {
493 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000)
494 return (EINVAL);
495 error = settime(td, tv);
496 }
497 if (tzp && error == 0) {
498 tz_minuteswest = tzp->tz_minuteswest;
499 tz_dsttime = tzp->tz_dsttime;
500 }
501 return (error);
502 }
503
504 /*
505 * Get value of an interval timer. The process virtual and profiling virtual
506 * time timers are kept in the p_stats area, since they can be swapped out.
507 * These are kept internally in the way they are specified externally: in
508 * time until they expire.
509 *
510 * The real time interval timer is kept in the process table slot for the
511 * process, and its value (it_value) is kept as an absolute time rather than
512 * as a delta, so that it is easy to keep periodic real-time signals from
513 * drifting.
514 *
515 * Virtual time timers are processed in the hardclock() routine of
516 * kern_clock.c. The real time timer is processed by a timeout routine,
517 * called from the softclock() routine. Since a callout may be delayed in
518 * real time due to interrupt processing in the system, it is possible for
519 * the real time timeout routine (realitexpire, given below), to be delayed
520 * in real time past when it is supposed to occur. It does not suffice,
521 * therefore, to reload the real timer .it_value from the real time timers
522 * .it_interval. Rather, we compute the next time in absolute time the timer
523 * should go off.
524 */
525 #ifndef _SYS_SYSPROTO_H_
526 struct getitimer_args {
527 u_int which;
528 struct itimerval *itv;
529 };
530 #endif
531 int
532 getitimer(struct thread *td, struct getitimer_args *uap)
533 {
534 struct itimerval aitv;
535 int error;
536
537 error = kern_getitimer(td, uap->which, &aitv);
538 if (error != 0)
539 return (error);
540 return (copyout(&aitv, uap->itv, sizeof (struct itimerval)));
541 }
542
543 int
544 kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv)
545 {
546 struct proc *p = td->td_proc;
547 struct timeval ctv;
548
549 if (which > ITIMER_PROF)
550 return (EINVAL);
551
552 if (which == ITIMER_REAL) {
553 /*
554 * Convert from absolute to relative time in .it_value
555 * part of real time timer. If time for real time timer
556 * has passed return 0, else return difference between
557 * current time and time for the timer to go off.
558 */
559 PROC_LOCK(p);
560 *aitv = p->p_realtimer;
561 PROC_UNLOCK(p);
562 if (timevalisset(&aitv->it_value)) {
563 getmicrouptime(&ctv);
564 if (timevalcmp(&aitv->it_value, &ctv, <))
565 timevalclear(&aitv->it_value);
566 else
567 timevalsub(&aitv->it_value, &ctv);
568 }
569 } else {
570 PROC_SLOCK(p);
571 *aitv = p->p_stats->p_timer[which];
572 PROC_SUNLOCK(p);
573 }
574 return (0);
575 }
576
577 #ifndef _SYS_SYSPROTO_H_
578 struct setitimer_args {
579 u_int which;
580 struct itimerval *itv, *oitv;
581 };
582 #endif
583 int
584 setitimer(struct thread *td, struct setitimer_args *uap)
585 {
586 struct itimerval aitv, oitv;
587 int error;
588
589 if (uap->itv == NULL) {
590 uap->itv = uap->oitv;
591 return (getitimer(td, (struct getitimer_args *)uap));
592 }
593
594 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval))))
595 return (error);
596 error = kern_setitimer(td, uap->which, &aitv, &oitv);
597 if (error != 0 || uap->oitv == NULL)
598 return (error);
599 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval)));
600 }
601
602 int
603 kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv,
604 struct itimerval *oitv)
605 {
606 struct proc *p = td->td_proc;
607 struct timeval ctv;
608
609 if (aitv == NULL)
610 return (kern_getitimer(td, which, oitv));
611
612 if (which > ITIMER_PROF)
613 return (EINVAL);
614 if (itimerfix(&aitv->it_value))
615 return (EINVAL);
616 if (!timevalisset(&aitv->it_value))
617 timevalclear(&aitv->it_interval);
618 else if (itimerfix(&aitv->it_interval))
619 return (EINVAL);
620
621 if (which == ITIMER_REAL) {
622 PROC_LOCK(p);
623 if (timevalisset(&p->p_realtimer.it_value))
624 callout_stop(&p->p_itcallout);
625 getmicrouptime(&ctv);
626 if (timevalisset(&aitv->it_value)) {
627 callout_reset(&p->p_itcallout, tvtohz(&aitv->it_value),
628 realitexpire, p);
629 timevaladd(&aitv->it_value, &ctv);
630 }
631 *oitv = p->p_realtimer;
632 p->p_realtimer = *aitv;
633 PROC_UNLOCK(p);
634 if (timevalisset(&oitv->it_value)) {
635 if (timevalcmp(&oitv->it_value, &ctv, <))
636 timevalclear(&oitv->it_value);
637 else
638 timevalsub(&oitv->it_value, &ctv);
639 }
640 } else {
641 PROC_SLOCK(p);
642 *oitv = p->p_stats->p_timer[which];
643 p->p_stats->p_timer[which] = *aitv;
644 PROC_SUNLOCK(p);
645 }
646 return (0);
647 }
648
649 /*
650 * Real interval timer expired:
651 * send process whose timer expired an alarm signal.
652 * If time is not set up to reload, then just return.
653 * Else compute next time timer should go off which is > current time.
654 * This is where delay in processing this timeout causes multiple
655 * SIGALRM calls to be compressed into one.
656 * tvtohz() always adds 1 to allow for the time until the next clock
657 * interrupt being strictly less than 1 clock tick, but we don't want
658 * that here since we want to appear to be in sync with the clock
659 * interrupt even when we're delayed.
660 */
661 void
662 realitexpire(void *arg)
663 {
664 struct proc *p;
665 struct timeval ctv, ntv;
666
667 p = (struct proc *)arg;
668 PROC_LOCK(p);
669 psignal(p, SIGALRM);
670 if (!timevalisset(&p->p_realtimer.it_interval)) {
671 timevalclear(&p->p_realtimer.it_value);
672 if (p->p_flag & P_WEXIT)
673 wakeup(&p->p_itcallout);
674 PROC_UNLOCK(p);
675 return;
676 }
677 for (;;) {
678 timevaladd(&p->p_realtimer.it_value,
679 &p->p_realtimer.it_interval);
680 getmicrouptime(&ctv);
681 if (timevalcmp(&p->p_realtimer.it_value, &ctv, >)) {
682 ntv = p->p_realtimer.it_value;
683 timevalsub(&ntv, &ctv);
684 callout_reset(&p->p_itcallout, tvtohz(&ntv) - 1,
685 realitexpire, p);
686 PROC_UNLOCK(p);
687 return;
688 }
689 }
690 /*NOTREACHED*/
691 }
692
693 /*
694 * Check that a proposed value to load into the .it_value or
695 * .it_interval part of an interval timer is acceptable, and
696 * fix it to have at least minimal value (i.e. if it is less
697 * than the resolution of the clock, round it up.)
698 */
699 int
700 itimerfix(struct timeval *tv)
701 {
702
703 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000)
704 return (EINVAL);
705 if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick)
706 tv->tv_usec = tick;
707 return (0);
708 }
709
710 /*
711 * Decrement an interval timer by a specified number
712 * of microseconds, which must be less than a second,
713 * i.e. < 1000000. If the timer expires, then reload
714 * it. In this case, carry over (usec - old value) to
715 * reduce the value reloaded into the timer so that
716 * the timer does not drift. This routine assumes
717 * that it is called in a context where the timers
718 * on which it is operating cannot change in value.
719 */
720 int
721 itimerdecr(struct itimerval *itp, int usec)
722 {
723
724 if (itp->it_value.tv_usec < usec) {
725 if (itp->it_value.tv_sec == 0) {
726 /* expired, and already in next interval */
727 usec -= itp->it_value.tv_usec;
728 goto expire;
729 }
730 itp->it_value.tv_usec += 1000000;
731 itp->it_value.tv_sec--;
732 }
733 itp->it_value.tv_usec -= usec;
734 usec = 0;
735 if (timevalisset(&itp->it_value))
736 return (1);
737 /* expired, exactly at end of interval */
738 expire:
739 if (timevalisset(&itp->it_interval)) {
740 itp->it_value = itp->it_interval;
741 itp->it_value.tv_usec -= usec;
742 if (itp->it_value.tv_usec < 0) {
743 itp->it_value.tv_usec += 1000000;
744 itp->it_value.tv_sec--;
745 }
746 } else
747 itp->it_value.tv_usec = 0; /* sec is already 0 */
748 return (0);
749 }
750
751 /*
752 * Add and subtract routines for timevals.
753 * N.B.: subtract routine doesn't deal with
754 * results which are before the beginning,
755 * it just gets very confused in this case.
756 * Caveat emptor.
757 */
758 void
759 timevaladd(struct timeval *t1, const struct timeval *t2)
760 {
761
762 t1->tv_sec += t2->tv_sec;
763 t1->tv_usec += t2->tv_usec;
764 timevalfix(t1);
765 }
766
767 void
768 timevalsub(struct timeval *t1, const struct timeval *t2)
769 {
770
771 t1->tv_sec -= t2->tv_sec;
772 t1->tv_usec -= t2->tv_usec;
773 timevalfix(t1);
774 }
775
776 static void
777 timevalfix(struct timeval *t1)
778 {
779
780 if (t1->tv_usec < 0) {
781 t1->tv_sec--;
782 t1->tv_usec += 1000000;
783 }
784 if (t1->tv_usec >= 1000000) {
785 t1->tv_sec++;
786 t1->tv_usec -= 1000000;
787 }
788 }
789
790 /*
791 * ratecheck(): simple time-based rate-limit checking.
792 */
793 int
794 ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
795 {
796 struct timeval tv, delta;
797 int rv = 0;
798
799 getmicrouptime(&tv); /* NB: 10ms precision */
800 delta = tv;
801 timevalsub(&delta, lasttime);
802
803 /*
804 * check for 0,0 is so that the message will be seen at least once,
805 * even if interval is huge.
806 */
807 if (timevalcmp(&delta, mininterval, >=) ||
808 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
809 *lasttime = tv;
810 rv = 1;
811 }
812
813 return (rv);
814 }
815
816 /*
817 * ppsratecheck(): packets (or events) per second limitation.
818 *
819 * Return 0 if the limit is to be enforced (e.g. the caller
820 * should drop a packet because of the rate limitation).
821 *
822 * maxpps of 0 always causes zero to be returned. maxpps of -1
823 * always causes 1 to be returned; this effectively defeats rate
824 * limiting.
825 *
826 * Note that we maintain the struct timeval for compatibility
827 * with other bsd systems. We reuse the storage and just monitor
828 * clock ticks for minimal overhead.
829 */
830 int
831 ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
832 {
833 int now;
834
835 /*
836 * Reset the last time and counter if this is the first call
837 * or more than a second has passed since the last update of
838 * lasttime.
839 */
840 now = ticks;
841 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) {
842 lasttime->tv_sec = now;
843 *curpps = 1;
844 return (maxpps != 0);
845 } else {
846 (*curpps)++; /* NB: ignore potential overflow */
847 return (maxpps < 0 || *curpps < maxpps);
848 }
849 }
850
851 static void
852 itimer_start(void)
853 {
854 struct kclock rt_clock = {
855 .timer_create = realtimer_create,
856 .timer_delete = realtimer_delete,
857 .timer_settime = realtimer_settime,
858 .timer_gettime = realtimer_gettime,
859 .event_hook = NULL
860 };
861
862 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer),
863 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0);
864 register_posix_clock(CLOCK_REALTIME, &rt_clock);
865 register_posix_clock(CLOCK_MONOTONIC, &rt_clock);
866 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L);
867 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX);
868 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX);
869 EVENTHANDLER_REGISTER(process_exit, itimers_event_hook_exit,
870 (void *)ITIMER_EV_EXIT, EVENTHANDLER_PRI_ANY);
871 EVENTHANDLER_REGISTER(process_exec, itimers_event_hook_exec,
872 (void *)ITIMER_EV_EXEC, EVENTHANDLER_PRI_ANY);
873 }
874
875 int
876 register_posix_clock(int clockid, struct kclock *clk)
877 {
878 if ((unsigned)clockid >= MAX_CLOCKS) {
879 printf("%s: invalid clockid\n", __func__);
880 return (0);
881 }
882 posix_clocks[clockid] = *clk;
883 return (1);
884 }
885
886 static int
887 itimer_init(void *mem, int size, int flags)
888 {
889 struct itimer *it;
890
891 it = (struct itimer *)mem;
892 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF);
893 return (0);
894 }
895
896 static void
897 itimer_fini(void *mem, int size)
898 {
899 struct itimer *it;
900
901 it = (struct itimer *)mem;
902 mtx_destroy(&it->it_mtx);
903 }
904
905 static void
906 itimer_enter(struct itimer *it)
907 {
908
909 mtx_assert(&it->it_mtx, MA_OWNED);
910 it->it_usecount++;
911 }
912
913 static void
914 itimer_leave(struct itimer *it)
915 {
916
917 mtx_assert(&it->it_mtx, MA_OWNED);
918 KASSERT(it->it_usecount > 0, ("invalid it_usecount"));
919
920 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0)
921 wakeup(it);
922 }
923
924 #ifndef _SYS_SYSPROTO_H_
925 struct ktimer_create_args {
926 clockid_t clock_id;
927 struct sigevent * evp;
928 int * timerid;
929 };
930 #endif
931 int
932 ktimer_create(struct thread *td, struct ktimer_create_args *uap)
933 {
934 struct sigevent *evp1, ev;
935 int id;
936 int error;
937
938 if (uap->evp != NULL) {
939 error = copyin(uap->evp, &ev, sizeof(ev));
940 if (error != 0)
941 return (error);
942 evp1 = &ev;
943 } else
944 evp1 = NULL;
945
946 error = kern_timer_create(td, uap->clock_id, evp1, &id, -1);
947
948 if (error == 0) {
949 error = copyout(&id, uap->timerid, sizeof(int));
950 if (error != 0)
951 kern_timer_delete(td, id);
952 }
953 return (error);
954 }
955
956 static int
957 kern_timer_create(struct thread *td, clockid_t clock_id,
958 struct sigevent *evp, int *timerid, int preset_id)
959 {
960 struct proc *p = td->td_proc;
961 struct itimer *it;
962 int id;
963 int error;
964
965 if (clock_id < 0 || clock_id >= MAX_CLOCKS)
966 return (EINVAL);
967
968 if (posix_clocks[clock_id].timer_create == NULL)
969 return (EINVAL);
970
971 if (evp != NULL) {
972 if (evp->sigev_notify != SIGEV_NONE &&
973 evp->sigev_notify != SIGEV_SIGNAL &&
974 evp->sigev_notify != SIGEV_THREAD_ID)
975 return (EINVAL);
976 if ((evp->sigev_notify == SIGEV_SIGNAL ||
977 evp->sigev_notify == SIGEV_THREAD_ID) &&
978 !_SIG_VALID(evp->sigev_signo))
979 return (EINVAL);
980 }
981
982 if (p->p_itimers == NULL)
983 itimers_alloc(p);
984
985 it = uma_zalloc(itimer_zone, M_WAITOK);
986 it->it_flags = 0;
987 it->it_usecount = 0;
988 it->it_active = 0;
989 timespecclear(&it->it_time.it_value);
990 timespecclear(&it->it_time.it_interval);
991 it->it_overrun = 0;
992 it->it_overrun_last = 0;
993 it->it_clockid = clock_id;
994 it->it_timerid = -1;
995 it->it_proc = p;
996 ksiginfo_init(&it->it_ksi);
997 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT;
998 error = CLOCK_CALL(clock_id, timer_create, (it));
999 if (error != 0)
1000 goto out;
1001
1002 PROC_LOCK(p);
1003 if (preset_id != -1) {
1004 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id"));
1005 id = preset_id;
1006 if (p->p_itimers->its_timers[id] != NULL) {
1007 PROC_UNLOCK(p);
1008 error = 0;
1009 goto out;
1010 }
1011 } else {
1012 /*
1013 * Find a free timer slot, skipping those reserved
1014 * for setitimer().
1015 */
1016 for (id = 3; id < TIMER_MAX; id++)
1017 if (p->p_itimers->its_timers[id] == NULL)
1018 break;
1019 if (id == TIMER_MAX) {
1020 PROC_UNLOCK(p);
1021 error = EAGAIN;
1022 goto out;
1023 }
1024 }
1025 it->it_timerid = id;
1026 p->p_itimers->its_timers[id] = it;
1027 if (evp != NULL)
1028 it->it_sigev = *evp;
1029 else {
1030 it->it_sigev.sigev_notify = SIGEV_SIGNAL;
1031 switch (clock_id) {
1032 default:
1033 case CLOCK_REALTIME:
1034 it->it_sigev.sigev_signo = SIGALRM;
1035 break;
1036 case CLOCK_VIRTUAL:
1037 it->it_sigev.sigev_signo = SIGVTALRM;
1038 break;
1039 case CLOCK_PROF:
1040 it->it_sigev.sigev_signo = SIGPROF;
1041 break;
1042 }
1043 it->it_sigev.sigev_value.sival_int = id;
1044 }
1045
1046 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1047 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1048 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo;
1049 it->it_ksi.ksi_code = SI_TIMER;
1050 it->it_ksi.ksi_value = it->it_sigev.sigev_value;
1051 it->it_ksi.ksi_timerid = id;
1052 }
1053 PROC_UNLOCK(p);
1054 *timerid = id;
1055 return (0);
1056
1057 out:
1058 ITIMER_LOCK(it);
1059 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1060 ITIMER_UNLOCK(it);
1061 uma_zfree(itimer_zone, it);
1062 return (error);
1063 }
1064
1065 #ifndef _SYS_SYSPROTO_H_
1066 struct ktimer_delete_args {
1067 int timerid;
1068 };
1069 #endif
1070 int
1071 ktimer_delete(struct thread *td, struct ktimer_delete_args *uap)
1072 {
1073 return (kern_timer_delete(td, uap->timerid));
1074 }
1075
1076 static struct itimer *
1077 itimer_find(struct proc *p, int timerid)
1078 {
1079 struct itimer *it;
1080
1081 PROC_LOCK_ASSERT(p, MA_OWNED);
1082 if ((p->p_itimers == NULL) ||
1083 (timerid < 0) || (timerid >= TIMER_MAX) ||
1084 (it = p->p_itimers->its_timers[timerid]) == NULL) {
1085 return (NULL);
1086 }
1087 ITIMER_LOCK(it);
1088 if ((it->it_flags & ITF_DELETING) != 0) {
1089 ITIMER_UNLOCK(it);
1090 it = NULL;
1091 }
1092 return (it);
1093 }
1094
1095 static int
1096 kern_timer_delete(struct thread *td, int timerid)
1097 {
1098 struct proc *p = td->td_proc;
1099 struct itimer *it;
1100
1101 PROC_LOCK(p);
1102 it = itimer_find(p, timerid);
1103 if (it == NULL) {
1104 PROC_UNLOCK(p);
1105 return (EINVAL);
1106 }
1107 PROC_UNLOCK(p);
1108
1109 it->it_flags |= ITF_DELETING;
1110 while (it->it_usecount > 0) {
1111 it->it_flags |= ITF_WANTED;
1112 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0);
1113 }
1114 it->it_flags &= ~ITF_WANTED;
1115 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1116 ITIMER_UNLOCK(it);
1117
1118 PROC_LOCK(p);
1119 if (KSI_ONQ(&it->it_ksi))
1120 sigqueue_take(&it->it_ksi);
1121 p->p_itimers->its_timers[timerid] = NULL;
1122 PROC_UNLOCK(p);
1123 uma_zfree(itimer_zone, it);
1124 return (0);
1125 }
1126
1127 #ifndef _SYS_SYSPROTO_H_
1128 struct ktimer_settime_args {
1129 int timerid;
1130 int flags;
1131 const struct itimerspec * value;
1132 struct itimerspec * ovalue;
1133 };
1134 #endif
1135 int
1136 ktimer_settime(struct thread *td, struct ktimer_settime_args *uap)
1137 {
1138 struct proc *p = td->td_proc;
1139 struct itimer *it;
1140 struct itimerspec val, oval, *ovalp;
1141 int error;
1142
1143 error = copyin(uap->value, &val, sizeof(val));
1144 if (error != 0)
1145 return (error);
1146
1147 if (uap->ovalue != NULL)
1148 ovalp = &oval;
1149 else
1150 ovalp = NULL;
1151
1152 PROC_LOCK(p);
1153 if (uap->timerid < 3 ||
1154 (it = itimer_find(p, uap->timerid)) == NULL) {
1155 PROC_UNLOCK(p);
1156 error = EINVAL;
1157 } else {
1158 PROC_UNLOCK(p);
1159 itimer_enter(it);
1160 error = CLOCK_CALL(it->it_clockid, timer_settime,
1161 (it, uap->flags, &val, ovalp));
1162 itimer_leave(it);
1163 ITIMER_UNLOCK(it);
1164 }
1165 if (error == 0 && uap->ovalue != NULL)
1166 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp));
1167 return (error);
1168 }
1169
1170 #ifndef _SYS_SYSPROTO_H_
1171 struct ktimer_gettime_args {
1172 int timerid;
1173 struct itimerspec * value;
1174 };
1175 #endif
1176 int
1177 ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap)
1178 {
1179 struct proc *p = td->td_proc;
1180 struct itimer *it;
1181 struct itimerspec val;
1182 int error;
1183
1184 PROC_LOCK(p);
1185 if (uap->timerid < 3 ||
1186 (it = itimer_find(p, uap->timerid)) == NULL) {
1187 PROC_UNLOCK(p);
1188 error = EINVAL;
1189 } else {
1190 PROC_UNLOCK(p);
1191 itimer_enter(it);
1192 error = CLOCK_CALL(it->it_clockid, timer_gettime,
1193 (it, &val));
1194 itimer_leave(it);
1195 ITIMER_UNLOCK(it);
1196 }
1197 if (error == 0)
1198 error = copyout(&val, uap->value, sizeof(val));
1199 return (error);
1200 }
1201
1202 #ifndef _SYS_SYSPROTO_H_
1203 struct timer_getoverrun_args {
1204 int timerid;
1205 };
1206 #endif
1207 int
1208 ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap)
1209 {
1210 struct proc *p = td->td_proc;
1211 struct itimer *it;
1212 int error ;
1213
1214 PROC_LOCK(p);
1215 if (uap->timerid < 3 ||
1216 (it = itimer_find(p, uap->timerid)) == NULL) {
1217 PROC_UNLOCK(p);
1218 error = EINVAL;
1219 } else {
1220 td->td_retval[0] = it->it_overrun_last;
1221 ITIMER_UNLOCK(it);
1222 PROC_UNLOCK(p);
1223 error = 0;
1224 }
1225 return (error);
1226 }
1227
1228 static int
1229 realtimer_create(struct itimer *it)
1230 {
1231 callout_init_mtx(&it->it_callout, &it->it_mtx, 0);
1232 return (0);
1233 }
1234
1235 static int
1236 realtimer_delete(struct itimer *it)
1237 {
1238 mtx_assert(&it->it_mtx, MA_OWNED);
1239
1240 /*
1241 * clear timer's value and interval to tell realtimer_expire
1242 * to not rearm the timer.
1243 */
1244 timespecclear(&it->it_time.it_value);
1245 timespecclear(&it->it_time.it_interval);
1246 ITIMER_UNLOCK(it);
1247 callout_drain(&it->it_callout);
1248 ITIMER_LOCK(it);
1249 return (0);
1250 }
1251
1252 static int
1253 realtimer_gettime(struct itimer *it, struct itimerspec *ovalue)
1254 {
1255 struct timespec cts;
1256
1257 mtx_assert(&it->it_mtx, MA_OWNED);
1258
1259 realtimer_clocktime(it->it_clockid, &cts);
1260 *ovalue = it->it_time;
1261 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) {
1262 timespecsub(&ovalue->it_value, &cts);
1263 if (ovalue->it_value.tv_sec < 0 ||
1264 (ovalue->it_value.tv_sec == 0 &&
1265 ovalue->it_value.tv_nsec == 0)) {
1266 ovalue->it_value.tv_sec = 0;
1267 ovalue->it_value.tv_nsec = 1;
1268 }
1269 }
1270 return (0);
1271 }
1272
1273 static int
1274 realtimer_settime(struct itimer *it, int flags,
1275 struct itimerspec *value, struct itimerspec *ovalue)
1276 {
1277 struct timespec cts, ts;
1278 struct timeval tv;
1279 struct itimerspec val;
1280
1281 mtx_assert(&it->it_mtx, MA_OWNED);
1282
1283 val = *value;
1284 if (itimespecfix(&val.it_value))
1285 return (EINVAL);
1286
1287 if (timespecisset(&val.it_value)) {
1288 if (itimespecfix(&val.it_interval))
1289 return (EINVAL);
1290 } else {
1291 timespecclear(&val.it_interval);
1292 }
1293
1294 if (ovalue != NULL)
1295 realtimer_gettime(it, ovalue);
1296
1297 it->it_time = val;
1298 if (timespecisset(&val.it_value)) {
1299 realtimer_clocktime(it->it_clockid, &cts);
1300 ts = val.it_value;
1301 if ((flags & TIMER_ABSTIME) == 0) {
1302 /* Convert to absolute time. */
1303 timespecadd(&it->it_time.it_value, &cts);
1304 } else {
1305 timespecsub(&ts, &cts);
1306 /*
1307 * We don't care if ts is negative, tztohz will
1308 * fix it.
1309 */
1310 }
1311 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1312 callout_reset(&it->it_callout, tvtohz(&tv),
1313 realtimer_expire, it);
1314 } else {
1315 callout_stop(&it->it_callout);
1316 }
1317
1318 return (0);
1319 }
1320
1321 static void
1322 realtimer_clocktime(clockid_t id, struct timespec *ts)
1323 {
1324 if (id == CLOCK_REALTIME)
1325 getnanotime(ts);
1326 else /* CLOCK_MONOTONIC */
1327 getnanouptime(ts);
1328 }
1329
1330 int
1331 itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi)
1332 {
1333 struct itimer *it;
1334
1335 PROC_LOCK_ASSERT(p, MA_OWNED);
1336 it = itimer_find(p, timerid);
1337 if (it != NULL) {
1338 ksi->ksi_overrun = it->it_overrun;
1339 it->it_overrun_last = it->it_overrun;
1340 it->it_overrun = 0;
1341 ITIMER_UNLOCK(it);
1342 return (0);
1343 }
1344 return (EINVAL);
1345 }
1346
1347 int
1348 itimespecfix(struct timespec *ts)
1349 {
1350
1351 if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
1352 return (EINVAL);
1353 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000)
1354 ts->tv_nsec = tick * 1000;
1355 return (0);
1356 }
1357
1358 /* Timeout callback for realtime timer */
1359 static void
1360 realtimer_expire(void *arg)
1361 {
1362 struct timespec cts, ts;
1363 struct timeval tv;
1364 struct itimer *it;
1365 struct proc *p;
1366
1367 it = (struct itimer *)arg;
1368 p = it->it_proc;
1369
1370 realtimer_clocktime(it->it_clockid, &cts);
1371 /* Only fire if time is reached. */
1372 if (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1373 if (timespecisset(&it->it_time.it_interval)) {
1374 timespecadd(&it->it_time.it_value,
1375 &it->it_time.it_interval);
1376 while (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1377 if (it->it_overrun < INT_MAX)
1378 it->it_overrun++;
1379 else
1380 it->it_ksi.ksi_errno = ERANGE;
1381 timespecadd(&it->it_time.it_value,
1382 &it->it_time.it_interval);
1383 }
1384 } else {
1385 /* single shot timer ? */
1386 timespecclear(&it->it_time.it_value);
1387 }
1388 if (timespecisset(&it->it_time.it_value)) {
1389 ts = it->it_time.it_value;
1390 timespecsub(&ts, &cts);
1391 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1392 callout_reset(&it->it_callout, tvtohz(&tv),
1393 realtimer_expire, it);
1394 }
1395 itimer_enter(it);
1396 ITIMER_UNLOCK(it);
1397 itimer_fire(it);
1398 ITIMER_LOCK(it);
1399 itimer_leave(it);
1400 } else if (timespecisset(&it->it_time.it_value)) {
1401 ts = it->it_time.it_value;
1402 timespecsub(&ts, &cts);
1403 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1404 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire,
1405 it);
1406 }
1407 }
1408
1409 void
1410 itimer_fire(struct itimer *it)
1411 {
1412 struct proc *p = it->it_proc;
1413 int ret;
1414
1415 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1416 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1417 PROC_LOCK(p);
1418 if (!KSI_ONQ(&it->it_ksi)) {
1419 it->it_ksi.ksi_errno = 0;
1420 ret = psignal_event(p, &it->it_sigev, &it->it_ksi);
1421 if (__predict_false(ret != 0)) {
1422 it->it_overrun++;
1423 /*
1424 * Broken userland code, thread went
1425 * away, disarm the timer.
1426 */
1427 if (ret == ESRCH) {
1428 ITIMER_LOCK(it);
1429 timespecclear(&it->it_time.it_value);
1430 timespecclear(&it->it_time.it_interval);
1431 callout_stop(&it->it_callout);
1432 ITIMER_UNLOCK(it);
1433 }
1434 }
1435 } else {
1436 if (it->it_overrun < INT_MAX)
1437 it->it_overrun++;
1438 else
1439 it->it_ksi.ksi_errno = ERANGE;
1440 }
1441 PROC_UNLOCK(p);
1442 }
1443 }
1444
1445 static void
1446 itimers_alloc(struct proc *p)
1447 {
1448 struct itimers *its;
1449 int i;
1450
1451 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO);
1452 LIST_INIT(&its->its_virtual);
1453 LIST_INIT(&its->its_prof);
1454 TAILQ_INIT(&its->its_worklist);
1455 for (i = 0; i < TIMER_MAX; i++)
1456 its->its_timers[i] = NULL;
1457 PROC_LOCK(p);
1458 if (p->p_itimers == NULL) {
1459 p->p_itimers = its;
1460 PROC_UNLOCK(p);
1461 }
1462 else {
1463 PROC_UNLOCK(p);
1464 free(its, M_SUBPROC);
1465 }
1466 }
1467
1468 static void
1469 itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp __unused)
1470 {
1471 itimers_event_hook_exit(arg, p);
1472 }
1473
1474 /* Clean up timers when some process events are being triggered. */
1475 static void
1476 itimers_event_hook_exit(void *arg, struct proc *p)
1477 {
1478 struct itimers *its;
1479 struct itimer *it;
1480 int event = (int)(intptr_t)arg;
1481 int i;
1482
1483 if (p->p_itimers != NULL) {
1484 its = p->p_itimers;
1485 for (i = 0; i < MAX_CLOCKS; ++i) {
1486 if (posix_clocks[i].event_hook != NULL)
1487 CLOCK_CALL(i, event_hook, (p, i, event));
1488 }
1489 /*
1490 * According to susv3, XSI interval timers should be inherited
1491 * by new image.
1492 */
1493 if (event == ITIMER_EV_EXEC)
1494 i = 3;
1495 else if (event == ITIMER_EV_EXIT)
1496 i = 0;
1497 else
1498 panic("unhandled event");
1499 for (; i < TIMER_MAX; ++i) {
1500 if ((it = its->its_timers[i]) != NULL)
1501 kern_timer_delete(curthread, i);
1502 }
1503 if (its->its_timers[0] == NULL &&
1504 its->its_timers[1] == NULL &&
1505 its->its_timers[2] == NULL) {
1506 free(its, M_SUBPROC);
1507 p->p_itimers = NULL;
1508 }
1509 }
1510 }
Cache object: 259ff0252ebdabe9768c2112543fe34f
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