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/11.0/sys/kern/kern_time.c 303092 2016-07-20 15:02:37Z kib $");
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
90 static void itimer_start(void);
91 static int itimer_init(void *, int, int);
92 static void itimer_fini(void *, int);
93 static void itimer_enter(struct itimer *);
94 static void itimer_leave(struct itimer *);
95 static struct itimer *itimer_find(struct proc *, int);
96 static void itimers_alloc(struct proc *);
97 static void itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp);
98 static void itimers_event_hook_exit(void *arg, struct proc *p);
99 static int realtimer_create(struct itimer *);
100 static int realtimer_gettime(struct itimer *, struct itimerspec *);
101 static int realtimer_settime(struct itimer *, int,
102 struct itimerspec *, struct itimerspec *);
103 static int realtimer_delete(struct itimer *);
104 static void realtimer_clocktime(clockid_t, struct timespec *);
105 static void realtimer_expire(void *);
106
107 int register_posix_clock(int, struct kclock *);
108 void itimer_fire(struct itimer *it);
109 int itimespecfix(struct timespec *ts);
110
111 #define CLOCK_CALL(clock, call, arglist) \
112 ((*posix_clocks[clock].call) arglist)
113
114 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL);
115
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 resettodr();
172 mtx_unlock(&Giant);
173 return (0);
174 }
175
176 #ifndef _SYS_SYSPROTO_H_
177 struct clock_getcpuclockid2_args {
178 id_t id;
179 int which,
180 clockid_t *clock_id;
181 };
182 #endif
183 /* ARGSUSED */
184 int
185 sys_clock_getcpuclockid2(struct thread *td, struct clock_getcpuclockid2_args *uap)
186 {
187 clockid_t clk_id;
188 int error;
189
190 error = kern_clock_getcpuclockid2(td, uap->id, uap->which, &clk_id);
191 if (error == 0)
192 error = copyout(&clk_id, uap->clock_id, sizeof(clockid_t));
193 return (error);
194 }
195
196 int
197 kern_clock_getcpuclockid2(struct thread *td, id_t id, int which,
198 clockid_t *clk_id)
199 {
200 struct proc *p;
201 pid_t pid;
202 lwpid_t tid;
203 int error;
204
205 switch (which) {
206 case CPUCLOCK_WHICH_PID:
207 if (id != 0) {
208 error = pget(id, PGET_CANSEE | PGET_NOTID, &p);
209 if (error != 0)
210 return (error);
211 PROC_UNLOCK(p);
212 pid = id;
213 } else {
214 pid = td->td_proc->p_pid;
215 }
216 *clk_id = MAKE_PROCESS_CPUCLOCK(pid);
217 return (0);
218 case CPUCLOCK_WHICH_TID:
219 tid = id == 0 ? td->td_tid : id;
220 *clk_id = MAKE_THREAD_CPUCLOCK(tid);
221 return (0);
222 default:
223 return (EINVAL);
224 }
225 }
226
227 #ifndef _SYS_SYSPROTO_H_
228 struct clock_gettime_args {
229 clockid_t clock_id;
230 struct timespec *tp;
231 };
232 #endif
233 /* ARGSUSED */
234 int
235 sys_clock_gettime(struct thread *td, struct clock_gettime_args *uap)
236 {
237 struct timespec ats;
238 int error;
239
240 error = kern_clock_gettime(td, uap->clock_id, &ats);
241 if (error == 0)
242 error = copyout(&ats, uap->tp, sizeof(ats));
243
244 return (error);
245 }
246
247 static inline void
248 cputick2timespec(uint64_t runtime, struct timespec *ats)
249 {
250 runtime = cputick2usec(runtime);
251 ats->tv_sec = runtime / 1000000;
252 ats->tv_nsec = runtime % 1000000 * 1000;
253 }
254
255 static void
256 get_thread_cputime(struct thread *targettd, struct timespec *ats)
257 {
258 uint64_t runtime, curtime, switchtime;
259
260 if (targettd == NULL) { /* current thread */
261 critical_enter();
262 switchtime = PCPU_GET(switchtime);
263 curtime = cpu_ticks();
264 runtime = curthread->td_runtime;
265 critical_exit();
266 runtime += curtime - switchtime;
267 } else {
268 thread_lock(targettd);
269 runtime = targettd->td_runtime;
270 thread_unlock(targettd);
271 }
272 cputick2timespec(runtime, ats);
273 }
274
275 static void
276 get_process_cputime(struct proc *targetp, struct timespec *ats)
277 {
278 uint64_t runtime;
279 struct rusage ru;
280
281 PROC_STATLOCK(targetp);
282 rufetch(targetp, &ru);
283 runtime = targetp->p_rux.rux_runtime;
284 PROC_STATUNLOCK(targetp);
285 cputick2timespec(runtime, ats);
286 }
287
288 static int
289 get_cputime(struct thread *td, clockid_t clock_id, struct timespec *ats)
290 {
291 struct proc *p, *p2;
292 struct thread *td2;
293 lwpid_t tid;
294 pid_t pid;
295 int error;
296
297 p = td->td_proc;
298 if ((clock_id & CPUCLOCK_PROCESS_BIT) == 0) {
299 tid = clock_id & CPUCLOCK_ID_MASK;
300 td2 = tdfind(tid, p->p_pid);
301 if (td2 == NULL)
302 return (EINVAL);
303 get_thread_cputime(td2, ats);
304 PROC_UNLOCK(td2->td_proc);
305 } else {
306 pid = clock_id & CPUCLOCK_ID_MASK;
307 error = pget(pid, PGET_CANSEE, &p2);
308 if (error != 0)
309 return (EINVAL);
310 get_process_cputime(p2, ats);
311 PROC_UNLOCK(p2);
312 }
313 return (0);
314 }
315
316 int
317 kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
318 {
319 struct timeval sys, user;
320 struct proc *p;
321
322 p = td->td_proc;
323 switch (clock_id) {
324 case CLOCK_REALTIME: /* Default to precise. */
325 case CLOCK_REALTIME_PRECISE:
326 nanotime(ats);
327 break;
328 case CLOCK_REALTIME_FAST:
329 getnanotime(ats);
330 break;
331 case CLOCK_VIRTUAL:
332 PROC_LOCK(p);
333 PROC_STATLOCK(p);
334 calcru(p, &user, &sys);
335 PROC_STATUNLOCK(p);
336 PROC_UNLOCK(p);
337 TIMEVAL_TO_TIMESPEC(&user, ats);
338 break;
339 case CLOCK_PROF:
340 PROC_LOCK(p);
341 PROC_STATLOCK(p);
342 calcru(p, &user, &sys);
343 PROC_STATUNLOCK(p);
344 PROC_UNLOCK(p);
345 timevaladd(&user, &sys);
346 TIMEVAL_TO_TIMESPEC(&user, ats);
347 break;
348 case CLOCK_MONOTONIC: /* Default to precise. */
349 case CLOCK_MONOTONIC_PRECISE:
350 case CLOCK_UPTIME:
351 case CLOCK_UPTIME_PRECISE:
352 nanouptime(ats);
353 break;
354 case CLOCK_UPTIME_FAST:
355 case CLOCK_MONOTONIC_FAST:
356 getnanouptime(ats);
357 break;
358 case CLOCK_SECOND:
359 ats->tv_sec = time_second;
360 ats->tv_nsec = 0;
361 break;
362 case CLOCK_THREAD_CPUTIME_ID:
363 get_thread_cputime(NULL, ats);
364 break;
365 case CLOCK_PROCESS_CPUTIME_ID:
366 PROC_LOCK(p);
367 get_process_cputime(p, ats);
368 PROC_UNLOCK(p);
369 break;
370 default:
371 if ((int)clock_id >= 0)
372 return (EINVAL);
373 return (get_cputime(td, clock_id, ats));
374 }
375 return (0);
376 }
377
378 #ifndef _SYS_SYSPROTO_H_
379 struct clock_settime_args {
380 clockid_t clock_id;
381 const struct timespec *tp;
382 };
383 #endif
384 /* ARGSUSED */
385 int
386 sys_clock_settime(struct thread *td, struct clock_settime_args *uap)
387 {
388 struct timespec ats;
389 int error;
390
391 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0)
392 return (error);
393 return (kern_clock_settime(td, uap->clock_id, &ats));
394 }
395
396 int
397 kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats)
398 {
399 struct timeval atv;
400 int error;
401
402 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0)
403 return (error);
404 if (clock_id != CLOCK_REALTIME)
405 return (EINVAL);
406 if (ats->tv_nsec < 0 || ats->tv_nsec >= 1000000000 ||
407 ats->tv_sec < 0)
408 return (EINVAL);
409 /* XXX Don't convert nsec->usec and back */
410 TIMESPEC_TO_TIMEVAL(&atv, ats);
411 error = settime(td, &atv);
412 return (error);
413 }
414
415 #ifndef _SYS_SYSPROTO_H_
416 struct clock_getres_args {
417 clockid_t clock_id;
418 struct timespec *tp;
419 };
420 #endif
421 int
422 sys_clock_getres(struct thread *td, struct clock_getres_args *uap)
423 {
424 struct timespec ts;
425 int error;
426
427 if (uap->tp == NULL)
428 return (0);
429
430 error = kern_clock_getres(td, uap->clock_id, &ts);
431 if (error == 0)
432 error = copyout(&ts, uap->tp, sizeof(ts));
433 return (error);
434 }
435
436 int
437 kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
438 {
439
440 ts->tv_sec = 0;
441 switch (clock_id) {
442 case CLOCK_REALTIME:
443 case CLOCK_REALTIME_FAST:
444 case CLOCK_REALTIME_PRECISE:
445 case CLOCK_MONOTONIC:
446 case CLOCK_MONOTONIC_FAST:
447 case CLOCK_MONOTONIC_PRECISE:
448 case CLOCK_UPTIME:
449 case CLOCK_UPTIME_FAST:
450 case CLOCK_UPTIME_PRECISE:
451 /*
452 * Round up the result of the division cheaply by adding 1.
453 * Rounding up is especially important if rounding down
454 * would give 0. Perfect rounding is unimportant.
455 */
456 ts->tv_nsec = 1000000000 / tc_getfrequency() + 1;
457 break;
458 case CLOCK_VIRTUAL:
459 case CLOCK_PROF:
460 /* Accurately round up here because we can do so cheaply. */
461 ts->tv_nsec = howmany(1000000000, hz);
462 break;
463 case CLOCK_SECOND:
464 ts->tv_sec = 1;
465 ts->tv_nsec = 0;
466 break;
467 case CLOCK_THREAD_CPUTIME_ID:
468 case CLOCK_PROCESS_CPUTIME_ID:
469 cputime:
470 /* sync with cputick2usec */
471 ts->tv_nsec = 1000000 / cpu_tickrate();
472 if (ts->tv_nsec == 0)
473 ts->tv_nsec = 1000;
474 break;
475 default:
476 if ((int)clock_id < 0)
477 goto cputime;
478 return (EINVAL);
479 }
480 return (0);
481 }
482
483 static uint8_t nanowait[MAXCPU];
484
485 int
486 kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt)
487 {
488 struct timespec ts;
489 sbintime_t sbt, sbtt, prec, tmp;
490 time_t over;
491 int error;
492
493 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000)
494 return (EINVAL);
495 if (rqt->tv_sec < 0 || (rqt->tv_sec == 0 && rqt->tv_nsec == 0))
496 return (0);
497 ts = *rqt;
498 if (ts.tv_sec > INT32_MAX / 2) {
499 over = ts.tv_sec - INT32_MAX / 2;
500 ts.tv_sec -= over;
501 } else
502 over = 0;
503 tmp = tstosbt(ts);
504 prec = tmp;
505 prec >>= tc_precexp;
506 if (TIMESEL(&sbt, tmp))
507 sbt += tc_tick_sbt;
508 sbt += tmp;
509 error = tsleep_sbt(&nanowait[curcpu], PWAIT | PCATCH, "nanslp",
510 sbt, prec, C_ABSOLUTE);
511 if (error != EWOULDBLOCK) {
512 if (error == ERESTART)
513 error = EINTR;
514 TIMESEL(&sbtt, tmp);
515 if (rmt != NULL) {
516 ts = sbttots(sbt - sbtt);
517 ts.tv_sec += over;
518 if (ts.tv_sec < 0)
519 timespecclear(&ts);
520 *rmt = ts;
521 }
522 if (sbtt >= sbt)
523 return (0);
524 return (error);
525 }
526 return (0);
527 }
528
529 #ifndef _SYS_SYSPROTO_H_
530 struct nanosleep_args {
531 struct timespec *rqtp;
532 struct timespec *rmtp;
533 };
534 #endif
535 /* ARGSUSED */
536 int
537 sys_nanosleep(struct thread *td, struct nanosleep_args *uap)
538 {
539 struct timespec rmt, rqt;
540 int error;
541
542 error = copyin(uap->rqtp, &rqt, sizeof(rqt));
543 if (error)
544 return (error);
545
546 if (uap->rmtp &&
547 !useracc((caddr_t)uap->rmtp, sizeof(rmt), VM_PROT_WRITE))
548 return (EFAULT);
549 error = kern_nanosleep(td, &rqt, &rmt);
550 if (error && uap->rmtp) {
551 int error2;
552
553 error2 = copyout(&rmt, uap->rmtp, sizeof(rmt));
554 if (error2)
555 error = error2;
556 }
557 return (error);
558 }
559
560 #ifndef _SYS_SYSPROTO_H_
561 struct gettimeofday_args {
562 struct timeval *tp;
563 struct timezone *tzp;
564 };
565 #endif
566 /* ARGSUSED */
567 int
568 sys_gettimeofday(struct thread *td, struct gettimeofday_args *uap)
569 {
570 struct timeval atv;
571 struct timezone rtz;
572 int error = 0;
573
574 if (uap->tp) {
575 microtime(&atv);
576 error = copyout(&atv, uap->tp, sizeof (atv));
577 }
578 if (error == 0 && uap->tzp != NULL) {
579 rtz.tz_minuteswest = tz_minuteswest;
580 rtz.tz_dsttime = tz_dsttime;
581 error = copyout(&rtz, uap->tzp, sizeof (rtz));
582 }
583 return (error);
584 }
585
586 #ifndef _SYS_SYSPROTO_H_
587 struct settimeofday_args {
588 struct timeval *tv;
589 struct timezone *tzp;
590 };
591 #endif
592 /* ARGSUSED */
593 int
594 sys_settimeofday(struct thread *td, struct settimeofday_args *uap)
595 {
596 struct timeval atv, *tvp;
597 struct timezone atz, *tzp;
598 int error;
599
600 if (uap->tv) {
601 error = copyin(uap->tv, &atv, sizeof(atv));
602 if (error)
603 return (error);
604 tvp = &atv;
605 } else
606 tvp = NULL;
607 if (uap->tzp) {
608 error = copyin(uap->tzp, &atz, sizeof(atz));
609 if (error)
610 return (error);
611 tzp = &atz;
612 } else
613 tzp = NULL;
614 return (kern_settimeofday(td, tvp, tzp));
615 }
616
617 int
618 kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp)
619 {
620 int error;
621
622 error = priv_check(td, PRIV_SETTIMEOFDAY);
623 if (error)
624 return (error);
625 /* Verify all parameters before changing time. */
626 if (tv) {
627 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000 ||
628 tv->tv_sec < 0)
629 return (EINVAL);
630 error = settime(td, tv);
631 }
632 if (tzp && error == 0) {
633 tz_minuteswest = tzp->tz_minuteswest;
634 tz_dsttime = tzp->tz_dsttime;
635 }
636 return (error);
637 }
638
639 /*
640 * Get value of an interval timer. The process virtual and profiling virtual
641 * time timers are kept in the p_stats area, since they can be swapped out.
642 * These are kept internally in the way they are specified externally: in
643 * time until they expire.
644 *
645 * The real time interval timer is kept in the process table slot for the
646 * process, and its value (it_value) is kept as an absolute time rather than
647 * as a delta, so that it is easy to keep periodic real-time signals from
648 * drifting.
649 *
650 * Virtual time timers are processed in the hardclock() routine of
651 * kern_clock.c. The real time timer is processed by a timeout routine,
652 * called from the softclock() routine. Since a callout may be delayed in
653 * real time due to interrupt processing in the system, it is possible for
654 * the real time timeout routine (realitexpire, given below), to be delayed
655 * in real time past when it is supposed to occur. It does not suffice,
656 * therefore, to reload the real timer .it_value from the real time timers
657 * .it_interval. Rather, we compute the next time in absolute time the timer
658 * should go off.
659 */
660 #ifndef _SYS_SYSPROTO_H_
661 struct getitimer_args {
662 u_int which;
663 struct itimerval *itv;
664 };
665 #endif
666 int
667 sys_getitimer(struct thread *td, struct getitimer_args *uap)
668 {
669 struct itimerval aitv;
670 int error;
671
672 error = kern_getitimer(td, uap->which, &aitv);
673 if (error != 0)
674 return (error);
675 return (copyout(&aitv, uap->itv, sizeof (struct itimerval)));
676 }
677
678 int
679 kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv)
680 {
681 struct proc *p = td->td_proc;
682 struct timeval ctv;
683
684 if (which > ITIMER_PROF)
685 return (EINVAL);
686
687 if (which == ITIMER_REAL) {
688 /*
689 * Convert from absolute to relative time in .it_value
690 * part of real time timer. If time for real time timer
691 * has passed return 0, else return difference between
692 * current time and time for the timer to go off.
693 */
694 PROC_LOCK(p);
695 *aitv = p->p_realtimer;
696 PROC_UNLOCK(p);
697 if (timevalisset(&aitv->it_value)) {
698 microuptime(&ctv);
699 if (timevalcmp(&aitv->it_value, &ctv, <))
700 timevalclear(&aitv->it_value);
701 else
702 timevalsub(&aitv->it_value, &ctv);
703 }
704 } else {
705 PROC_ITIMLOCK(p);
706 *aitv = p->p_stats->p_timer[which];
707 PROC_ITIMUNLOCK(p);
708 }
709 #ifdef KTRACE
710 if (KTRPOINT(td, KTR_STRUCT))
711 ktritimerval(aitv);
712 #endif
713 return (0);
714 }
715
716 #ifndef _SYS_SYSPROTO_H_
717 struct setitimer_args {
718 u_int which;
719 struct itimerval *itv, *oitv;
720 };
721 #endif
722 int
723 sys_setitimer(struct thread *td, struct setitimer_args *uap)
724 {
725 struct itimerval aitv, oitv;
726 int error;
727
728 if (uap->itv == NULL) {
729 uap->itv = uap->oitv;
730 return (sys_getitimer(td, (struct getitimer_args *)uap));
731 }
732
733 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval))))
734 return (error);
735 error = kern_setitimer(td, uap->which, &aitv, &oitv);
736 if (error != 0 || uap->oitv == NULL)
737 return (error);
738 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval)));
739 }
740
741 int
742 kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv,
743 struct itimerval *oitv)
744 {
745 struct proc *p = td->td_proc;
746 struct timeval ctv;
747 sbintime_t sbt, pr;
748
749 if (aitv == NULL)
750 return (kern_getitimer(td, which, oitv));
751
752 if (which > ITIMER_PROF)
753 return (EINVAL);
754 #ifdef KTRACE
755 if (KTRPOINT(td, KTR_STRUCT))
756 ktritimerval(aitv);
757 #endif
758 if (itimerfix(&aitv->it_value) ||
759 aitv->it_value.tv_sec > INT32_MAX / 2)
760 return (EINVAL);
761 if (!timevalisset(&aitv->it_value))
762 timevalclear(&aitv->it_interval);
763 else if (itimerfix(&aitv->it_interval) ||
764 aitv->it_interval.tv_sec > INT32_MAX / 2)
765 return (EINVAL);
766
767 if (which == ITIMER_REAL) {
768 PROC_LOCK(p);
769 if (timevalisset(&p->p_realtimer.it_value))
770 callout_stop(&p->p_itcallout);
771 microuptime(&ctv);
772 if (timevalisset(&aitv->it_value)) {
773 pr = tvtosbt(aitv->it_value) >> tc_precexp;
774 timevaladd(&aitv->it_value, &ctv);
775 sbt = tvtosbt(aitv->it_value);
776 callout_reset_sbt(&p->p_itcallout, sbt, pr,
777 realitexpire, p, C_ABSOLUTE);
778 }
779 *oitv = p->p_realtimer;
780 p->p_realtimer = *aitv;
781 PROC_UNLOCK(p);
782 if (timevalisset(&oitv->it_value)) {
783 if (timevalcmp(&oitv->it_value, &ctv, <))
784 timevalclear(&oitv->it_value);
785 else
786 timevalsub(&oitv->it_value, &ctv);
787 }
788 } else {
789 if (aitv->it_interval.tv_sec == 0 &&
790 aitv->it_interval.tv_usec != 0 &&
791 aitv->it_interval.tv_usec < tick)
792 aitv->it_interval.tv_usec = tick;
793 if (aitv->it_value.tv_sec == 0 &&
794 aitv->it_value.tv_usec != 0 &&
795 aitv->it_value.tv_usec < tick)
796 aitv->it_value.tv_usec = tick;
797 PROC_ITIMLOCK(p);
798 *oitv = p->p_stats->p_timer[which];
799 p->p_stats->p_timer[which] = *aitv;
800 PROC_ITIMUNLOCK(p);
801 }
802 #ifdef KTRACE
803 if (KTRPOINT(td, KTR_STRUCT))
804 ktritimerval(oitv);
805 #endif
806 return (0);
807 }
808
809 /*
810 * Real interval timer expired:
811 * send process whose timer expired an alarm signal.
812 * If time is not set up to reload, then just return.
813 * Else compute next time timer should go off which is > current time.
814 * This is where delay in processing this timeout causes multiple
815 * SIGALRM calls to be compressed into one.
816 * tvtohz() always adds 1 to allow for the time until the next clock
817 * interrupt being strictly less than 1 clock tick, but we don't want
818 * that here since we want to appear to be in sync with the clock
819 * interrupt even when we're delayed.
820 */
821 void
822 realitexpire(void *arg)
823 {
824 struct proc *p;
825 struct timeval ctv;
826 sbintime_t isbt;
827
828 p = (struct proc *)arg;
829 kern_psignal(p, SIGALRM);
830 if (!timevalisset(&p->p_realtimer.it_interval)) {
831 timevalclear(&p->p_realtimer.it_value);
832 if (p->p_flag & P_WEXIT)
833 wakeup(&p->p_itcallout);
834 return;
835 }
836 isbt = tvtosbt(p->p_realtimer.it_interval);
837 if (isbt >= sbt_timethreshold)
838 getmicrouptime(&ctv);
839 else
840 microuptime(&ctv);
841 do {
842 timevaladd(&p->p_realtimer.it_value,
843 &p->p_realtimer.it_interval);
844 } while (timevalcmp(&p->p_realtimer.it_value, &ctv, <=));
845 callout_reset_sbt(&p->p_itcallout, tvtosbt(p->p_realtimer.it_value),
846 isbt >> tc_precexp, realitexpire, p, C_ABSOLUTE);
847 }
848
849 /*
850 * Check that a proposed value to load into the .it_value or
851 * .it_interval part of an interval timer is acceptable, and
852 * fix it to have at least minimal value (i.e. if it is less
853 * than the resolution of the clock, round it up.)
854 */
855 int
856 itimerfix(struct timeval *tv)
857 {
858
859 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000)
860 return (EINVAL);
861 if (tv->tv_sec == 0 && tv->tv_usec != 0 &&
862 tv->tv_usec < (u_int)tick / 16)
863 tv->tv_usec = (u_int)tick / 16;
864 return (0);
865 }
866
867 /*
868 * Decrement an interval timer by a specified number
869 * of microseconds, which must be less than a second,
870 * i.e. < 1000000. If the timer expires, then reload
871 * it. In this case, carry over (usec - old value) to
872 * reduce the value reloaded into the timer so that
873 * the timer does not drift. This routine assumes
874 * that it is called in a context where the timers
875 * on which it is operating cannot change in value.
876 */
877 int
878 itimerdecr(struct itimerval *itp, int usec)
879 {
880
881 if (itp->it_value.tv_usec < usec) {
882 if (itp->it_value.tv_sec == 0) {
883 /* expired, and already in next interval */
884 usec -= itp->it_value.tv_usec;
885 goto expire;
886 }
887 itp->it_value.tv_usec += 1000000;
888 itp->it_value.tv_sec--;
889 }
890 itp->it_value.tv_usec -= usec;
891 usec = 0;
892 if (timevalisset(&itp->it_value))
893 return (1);
894 /* expired, exactly at end of interval */
895 expire:
896 if (timevalisset(&itp->it_interval)) {
897 itp->it_value = itp->it_interval;
898 itp->it_value.tv_usec -= usec;
899 if (itp->it_value.tv_usec < 0) {
900 itp->it_value.tv_usec += 1000000;
901 itp->it_value.tv_sec--;
902 }
903 } else
904 itp->it_value.tv_usec = 0; /* sec is already 0 */
905 return (0);
906 }
907
908 /*
909 * Add and subtract routines for timevals.
910 * N.B.: subtract routine doesn't deal with
911 * results which are before the beginning,
912 * it just gets very confused in this case.
913 * Caveat emptor.
914 */
915 void
916 timevaladd(struct timeval *t1, const struct timeval *t2)
917 {
918
919 t1->tv_sec += t2->tv_sec;
920 t1->tv_usec += t2->tv_usec;
921 timevalfix(t1);
922 }
923
924 void
925 timevalsub(struct timeval *t1, const struct timeval *t2)
926 {
927
928 t1->tv_sec -= t2->tv_sec;
929 t1->tv_usec -= t2->tv_usec;
930 timevalfix(t1);
931 }
932
933 static void
934 timevalfix(struct timeval *t1)
935 {
936
937 if (t1->tv_usec < 0) {
938 t1->tv_sec--;
939 t1->tv_usec += 1000000;
940 }
941 if (t1->tv_usec >= 1000000) {
942 t1->tv_sec++;
943 t1->tv_usec -= 1000000;
944 }
945 }
946
947 /*
948 * ratecheck(): simple time-based rate-limit checking.
949 */
950 int
951 ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
952 {
953 struct timeval tv, delta;
954 int rv = 0;
955
956 getmicrouptime(&tv); /* NB: 10ms precision */
957 delta = tv;
958 timevalsub(&delta, lasttime);
959
960 /*
961 * check for 0,0 is so that the message will be seen at least once,
962 * even if interval is huge.
963 */
964 if (timevalcmp(&delta, mininterval, >=) ||
965 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
966 *lasttime = tv;
967 rv = 1;
968 }
969
970 return (rv);
971 }
972
973 /*
974 * ppsratecheck(): packets (or events) per second limitation.
975 *
976 * Return 0 if the limit is to be enforced (e.g. the caller
977 * should drop a packet because of the rate limitation).
978 *
979 * maxpps of 0 always causes zero to be returned. maxpps of -1
980 * always causes 1 to be returned; this effectively defeats rate
981 * limiting.
982 *
983 * Note that we maintain the struct timeval for compatibility
984 * with other bsd systems. We reuse the storage and just monitor
985 * clock ticks for minimal overhead.
986 */
987 int
988 ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
989 {
990 int now;
991
992 /*
993 * Reset the last time and counter if this is the first call
994 * or more than a second has passed since the last update of
995 * lasttime.
996 */
997 now = ticks;
998 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) {
999 lasttime->tv_sec = now;
1000 *curpps = 1;
1001 return (maxpps != 0);
1002 } else {
1003 (*curpps)++; /* NB: ignore potential overflow */
1004 return (maxpps < 0 || *curpps <= maxpps);
1005 }
1006 }
1007
1008 static void
1009 itimer_start(void)
1010 {
1011 struct kclock rt_clock = {
1012 .timer_create = realtimer_create,
1013 .timer_delete = realtimer_delete,
1014 .timer_settime = realtimer_settime,
1015 .timer_gettime = realtimer_gettime,
1016 .event_hook = NULL
1017 };
1018
1019 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer),
1020 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0);
1021 register_posix_clock(CLOCK_REALTIME, &rt_clock);
1022 register_posix_clock(CLOCK_MONOTONIC, &rt_clock);
1023 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L);
1024 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX);
1025 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX);
1026 EVENTHANDLER_REGISTER(process_exit, itimers_event_hook_exit,
1027 (void *)ITIMER_EV_EXIT, EVENTHANDLER_PRI_ANY);
1028 EVENTHANDLER_REGISTER(process_exec, itimers_event_hook_exec,
1029 (void *)ITIMER_EV_EXEC, EVENTHANDLER_PRI_ANY);
1030 }
1031
1032 int
1033 register_posix_clock(int clockid, struct kclock *clk)
1034 {
1035 if ((unsigned)clockid >= MAX_CLOCKS) {
1036 printf("%s: invalid clockid\n", __func__);
1037 return (0);
1038 }
1039 posix_clocks[clockid] = *clk;
1040 return (1);
1041 }
1042
1043 static int
1044 itimer_init(void *mem, int size, int flags)
1045 {
1046 struct itimer *it;
1047
1048 it = (struct itimer *)mem;
1049 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF);
1050 return (0);
1051 }
1052
1053 static void
1054 itimer_fini(void *mem, int size)
1055 {
1056 struct itimer *it;
1057
1058 it = (struct itimer *)mem;
1059 mtx_destroy(&it->it_mtx);
1060 }
1061
1062 static void
1063 itimer_enter(struct itimer *it)
1064 {
1065
1066 mtx_assert(&it->it_mtx, MA_OWNED);
1067 it->it_usecount++;
1068 }
1069
1070 static void
1071 itimer_leave(struct itimer *it)
1072 {
1073
1074 mtx_assert(&it->it_mtx, MA_OWNED);
1075 KASSERT(it->it_usecount > 0, ("invalid it_usecount"));
1076
1077 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0)
1078 wakeup(it);
1079 }
1080
1081 #ifndef _SYS_SYSPROTO_H_
1082 struct ktimer_create_args {
1083 clockid_t clock_id;
1084 struct sigevent * evp;
1085 int * timerid;
1086 };
1087 #endif
1088 int
1089 sys_ktimer_create(struct thread *td, struct ktimer_create_args *uap)
1090 {
1091 struct sigevent *evp, ev;
1092 int id;
1093 int error;
1094
1095 if (uap->evp == NULL) {
1096 evp = NULL;
1097 } else {
1098 error = copyin(uap->evp, &ev, sizeof(ev));
1099 if (error != 0)
1100 return (error);
1101 evp = &ev;
1102 }
1103 error = kern_ktimer_create(td, uap->clock_id, evp, &id, -1);
1104 if (error == 0) {
1105 error = copyout(&id, uap->timerid, sizeof(int));
1106 if (error != 0)
1107 kern_ktimer_delete(td, id);
1108 }
1109 return (error);
1110 }
1111
1112 int
1113 kern_ktimer_create(struct thread *td, clockid_t clock_id, struct sigevent *evp,
1114 int *timerid, int preset_id)
1115 {
1116 struct proc *p = td->td_proc;
1117 struct itimer *it;
1118 int id;
1119 int error;
1120
1121 if (clock_id < 0 || clock_id >= MAX_CLOCKS)
1122 return (EINVAL);
1123
1124 if (posix_clocks[clock_id].timer_create == NULL)
1125 return (EINVAL);
1126
1127 if (evp != NULL) {
1128 if (evp->sigev_notify != SIGEV_NONE &&
1129 evp->sigev_notify != SIGEV_SIGNAL &&
1130 evp->sigev_notify != SIGEV_THREAD_ID)
1131 return (EINVAL);
1132 if ((evp->sigev_notify == SIGEV_SIGNAL ||
1133 evp->sigev_notify == SIGEV_THREAD_ID) &&
1134 !_SIG_VALID(evp->sigev_signo))
1135 return (EINVAL);
1136 }
1137
1138 if (p->p_itimers == NULL)
1139 itimers_alloc(p);
1140
1141 it = uma_zalloc(itimer_zone, M_WAITOK);
1142 it->it_flags = 0;
1143 it->it_usecount = 0;
1144 it->it_active = 0;
1145 timespecclear(&it->it_time.it_value);
1146 timespecclear(&it->it_time.it_interval);
1147 it->it_overrun = 0;
1148 it->it_overrun_last = 0;
1149 it->it_clockid = clock_id;
1150 it->it_timerid = -1;
1151 it->it_proc = p;
1152 ksiginfo_init(&it->it_ksi);
1153 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT;
1154 error = CLOCK_CALL(clock_id, timer_create, (it));
1155 if (error != 0)
1156 goto out;
1157
1158 PROC_LOCK(p);
1159 if (preset_id != -1) {
1160 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id"));
1161 id = preset_id;
1162 if (p->p_itimers->its_timers[id] != NULL) {
1163 PROC_UNLOCK(p);
1164 error = 0;
1165 goto out;
1166 }
1167 } else {
1168 /*
1169 * Find a free timer slot, skipping those reserved
1170 * for setitimer().
1171 */
1172 for (id = 3; id < TIMER_MAX; id++)
1173 if (p->p_itimers->its_timers[id] == NULL)
1174 break;
1175 if (id == TIMER_MAX) {
1176 PROC_UNLOCK(p);
1177 error = EAGAIN;
1178 goto out;
1179 }
1180 }
1181 it->it_timerid = id;
1182 p->p_itimers->its_timers[id] = it;
1183 if (evp != NULL)
1184 it->it_sigev = *evp;
1185 else {
1186 it->it_sigev.sigev_notify = SIGEV_SIGNAL;
1187 switch (clock_id) {
1188 default:
1189 case CLOCK_REALTIME:
1190 it->it_sigev.sigev_signo = SIGALRM;
1191 break;
1192 case CLOCK_VIRTUAL:
1193 it->it_sigev.sigev_signo = SIGVTALRM;
1194 break;
1195 case CLOCK_PROF:
1196 it->it_sigev.sigev_signo = SIGPROF;
1197 break;
1198 }
1199 it->it_sigev.sigev_value.sival_int = id;
1200 }
1201
1202 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1203 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1204 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo;
1205 it->it_ksi.ksi_code = SI_TIMER;
1206 it->it_ksi.ksi_value = it->it_sigev.sigev_value;
1207 it->it_ksi.ksi_timerid = id;
1208 }
1209 PROC_UNLOCK(p);
1210 *timerid = id;
1211 return (0);
1212
1213 out:
1214 ITIMER_LOCK(it);
1215 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1216 ITIMER_UNLOCK(it);
1217 uma_zfree(itimer_zone, it);
1218 return (error);
1219 }
1220
1221 #ifndef _SYS_SYSPROTO_H_
1222 struct ktimer_delete_args {
1223 int timerid;
1224 };
1225 #endif
1226 int
1227 sys_ktimer_delete(struct thread *td, struct ktimer_delete_args *uap)
1228 {
1229
1230 return (kern_ktimer_delete(td, uap->timerid));
1231 }
1232
1233 static struct itimer *
1234 itimer_find(struct proc *p, int timerid)
1235 {
1236 struct itimer *it;
1237
1238 PROC_LOCK_ASSERT(p, MA_OWNED);
1239 if ((p->p_itimers == NULL) ||
1240 (timerid < 0) || (timerid >= TIMER_MAX) ||
1241 (it = p->p_itimers->its_timers[timerid]) == NULL) {
1242 return (NULL);
1243 }
1244 ITIMER_LOCK(it);
1245 if ((it->it_flags & ITF_DELETING) != 0) {
1246 ITIMER_UNLOCK(it);
1247 it = NULL;
1248 }
1249 return (it);
1250 }
1251
1252 int
1253 kern_ktimer_delete(struct thread *td, int timerid)
1254 {
1255 struct proc *p = td->td_proc;
1256 struct itimer *it;
1257
1258 PROC_LOCK(p);
1259 it = itimer_find(p, timerid);
1260 if (it == NULL) {
1261 PROC_UNLOCK(p);
1262 return (EINVAL);
1263 }
1264 PROC_UNLOCK(p);
1265
1266 it->it_flags |= ITF_DELETING;
1267 while (it->it_usecount > 0) {
1268 it->it_flags |= ITF_WANTED;
1269 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0);
1270 }
1271 it->it_flags &= ~ITF_WANTED;
1272 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1273 ITIMER_UNLOCK(it);
1274
1275 PROC_LOCK(p);
1276 if (KSI_ONQ(&it->it_ksi))
1277 sigqueue_take(&it->it_ksi);
1278 p->p_itimers->its_timers[timerid] = NULL;
1279 PROC_UNLOCK(p);
1280 uma_zfree(itimer_zone, it);
1281 return (0);
1282 }
1283
1284 #ifndef _SYS_SYSPROTO_H_
1285 struct ktimer_settime_args {
1286 int timerid;
1287 int flags;
1288 const struct itimerspec * value;
1289 struct itimerspec * ovalue;
1290 };
1291 #endif
1292 int
1293 sys_ktimer_settime(struct thread *td, struct ktimer_settime_args *uap)
1294 {
1295 struct itimerspec val, oval, *ovalp;
1296 int error;
1297
1298 error = copyin(uap->value, &val, sizeof(val));
1299 if (error != 0)
1300 return (error);
1301 ovalp = uap->ovalue != NULL ? &oval : NULL;
1302 error = kern_ktimer_settime(td, uap->timerid, uap->flags, &val, ovalp);
1303 if (error == 0 && uap->ovalue != NULL)
1304 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp));
1305 return (error);
1306 }
1307
1308 int
1309 kern_ktimer_settime(struct thread *td, int timer_id, int flags,
1310 struct itimerspec *val, struct itimerspec *oval)
1311 {
1312 struct proc *p;
1313 struct itimer *it;
1314 int error;
1315
1316 p = td->td_proc;
1317 PROC_LOCK(p);
1318 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1319 PROC_UNLOCK(p);
1320 error = EINVAL;
1321 } else {
1322 PROC_UNLOCK(p);
1323 itimer_enter(it);
1324 error = CLOCK_CALL(it->it_clockid, timer_settime, (it,
1325 flags, val, oval));
1326 itimer_leave(it);
1327 ITIMER_UNLOCK(it);
1328 }
1329 return (error);
1330 }
1331
1332 #ifndef _SYS_SYSPROTO_H_
1333 struct ktimer_gettime_args {
1334 int timerid;
1335 struct itimerspec * value;
1336 };
1337 #endif
1338 int
1339 sys_ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap)
1340 {
1341 struct itimerspec val;
1342 int error;
1343
1344 error = kern_ktimer_gettime(td, uap->timerid, &val);
1345 if (error == 0)
1346 error = copyout(&val, uap->value, sizeof(val));
1347 return (error);
1348 }
1349
1350 int
1351 kern_ktimer_gettime(struct thread *td, int timer_id, struct itimerspec *val)
1352 {
1353 struct proc *p;
1354 struct itimer *it;
1355 int error;
1356
1357 p = td->td_proc;
1358 PROC_LOCK(p);
1359 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1360 PROC_UNLOCK(p);
1361 error = EINVAL;
1362 } else {
1363 PROC_UNLOCK(p);
1364 itimer_enter(it);
1365 error = CLOCK_CALL(it->it_clockid, timer_gettime, (it, val));
1366 itimer_leave(it);
1367 ITIMER_UNLOCK(it);
1368 }
1369 return (error);
1370 }
1371
1372 #ifndef _SYS_SYSPROTO_H_
1373 struct timer_getoverrun_args {
1374 int timerid;
1375 };
1376 #endif
1377 int
1378 sys_ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap)
1379 {
1380
1381 return (kern_ktimer_getoverrun(td, uap->timerid));
1382 }
1383
1384 int
1385 kern_ktimer_getoverrun(struct thread *td, int timer_id)
1386 {
1387 struct proc *p = td->td_proc;
1388 struct itimer *it;
1389 int error ;
1390
1391 PROC_LOCK(p);
1392 if (timer_id < 3 ||
1393 (it = itimer_find(p, timer_id)) == NULL) {
1394 PROC_UNLOCK(p);
1395 error = EINVAL;
1396 } else {
1397 td->td_retval[0] = it->it_overrun_last;
1398 ITIMER_UNLOCK(it);
1399 PROC_UNLOCK(p);
1400 error = 0;
1401 }
1402 return (error);
1403 }
1404
1405 static int
1406 realtimer_create(struct itimer *it)
1407 {
1408 callout_init_mtx(&it->it_callout, &it->it_mtx, 0);
1409 return (0);
1410 }
1411
1412 static int
1413 realtimer_delete(struct itimer *it)
1414 {
1415 mtx_assert(&it->it_mtx, MA_OWNED);
1416
1417 /*
1418 * clear timer's value and interval to tell realtimer_expire
1419 * to not rearm the timer.
1420 */
1421 timespecclear(&it->it_time.it_value);
1422 timespecclear(&it->it_time.it_interval);
1423 ITIMER_UNLOCK(it);
1424 callout_drain(&it->it_callout);
1425 ITIMER_LOCK(it);
1426 return (0);
1427 }
1428
1429 static int
1430 realtimer_gettime(struct itimer *it, struct itimerspec *ovalue)
1431 {
1432 struct timespec cts;
1433
1434 mtx_assert(&it->it_mtx, MA_OWNED);
1435
1436 realtimer_clocktime(it->it_clockid, &cts);
1437 *ovalue = it->it_time;
1438 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) {
1439 timespecsub(&ovalue->it_value, &cts);
1440 if (ovalue->it_value.tv_sec < 0 ||
1441 (ovalue->it_value.tv_sec == 0 &&
1442 ovalue->it_value.tv_nsec == 0)) {
1443 ovalue->it_value.tv_sec = 0;
1444 ovalue->it_value.tv_nsec = 1;
1445 }
1446 }
1447 return (0);
1448 }
1449
1450 static int
1451 realtimer_settime(struct itimer *it, int flags,
1452 struct itimerspec *value, struct itimerspec *ovalue)
1453 {
1454 struct timespec cts, ts;
1455 struct timeval tv;
1456 struct itimerspec val;
1457
1458 mtx_assert(&it->it_mtx, MA_OWNED);
1459
1460 val = *value;
1461 if (itimespecfix(&val.it_value))
1462 return (EINVAL);
1463
1464 if (timespecisset(&val.it_value)) {
1465 if (itimespecfix(&val.it_interval))
1466 return (EINVAL);
1467 } else {
1468 timespecclear(&val.it_interval);
1469 }
1470
1471 if (ovalue != NULL)
1472 realtimer_gettime(it, ovalue);
1473
1474 it->it_time = val;
1475 if (timespecisset(&val.it_value)) {
1476 realtimer_clocktime(it->it_clockid, &cts);
1477 ts = val.it_value;
1478 if ((flags & TIMER_ABSTIME) == 0) {
1479 /* Convert to absolute time. */
1480 timespecadd(&it->it_time.it_value, &cts);
1481 } else {
1482 timespecsub(&ts, &cts);
1483 /*
1484 * We don't care if ts is negative, tztohz will
1485 * fix it.
1486 */
1487 }
1488 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1489 callout_reset(&it->it_callout, tvtohz(&tv),
1490 realtimer_expire, it);
1491 } else {
1492 callout_stop(&it->it_callout);
1493 }
1494
1495 return (0);
1496 }
1497
1498 static void
1499 realtimer_clocktime(clockid_t id, struct timespec *ts)
1500 {
1501 if (id == CLOCK_REALTIME)
1502 getnanotime(ts);
1503 else /* CLOCK_MONOTONIC */
1504 getnanouptime(ts);
1505 }
1506
1507 int
1508 itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi)
1509 {
1510 struct itimer *it;
1511
1512 PROC_LOCK_ASSERT(p, MA_OWNED);
1513 it = itimer_find(p, timerid);
1514 if (it != NULL) {
1515 ksi->ksi_overrun = it->it_overrun;
1516 it->it_overrun_last = it->it_overrun;
1517 it->it_overrun = 0;
1518 ITIMER_UNLOCK(it);
1519 return (0);
1520 }
1521 return (EINVAL);
1522 }
1523
1524 int
1525 itimespecfix(struct timespec *ts)
1526 {
1527
1528 if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
1529 return (EINVAL);
1530 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000)
1531 ts->tv_nsec = tick * 1000;
1532 return (0);
1533 }
1534
1535 /* Timeout callback for realtime timer */
1536 static void
1537 realtimer_expire(void *arg)
1538 {
1539 struct timespec cts, ts;
1540 struct timeval tv;
1541 struct itimer *it;
1542
1543 it = (struct itimer *)arg;
1544
1545 realtimer_clocktime(it->it_clockid, &cts);
1546 /* Only fire if time is reached. */
1547 if (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1548 if (timespecisset(&it->it_time.it_interval)) {
1549 timespecadd(&it->it_time.it_value,
1550 &it->it_time.it_interval);
1551 while (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1552 if (it->it_overrun < INT_MAX)
1553 it->it_overrun++;
1554 else
1555 it->it_ksi.ksi_errno = ERANGE;
1556 timespecadd(&it->it_time.it_value,
1557 &it->it_time.it_interval);
1558 }
1559 } else {
1560 /* single shot timer ? */
1561 timespecclear(&it->it_time.it_value);
1562 }
1563 if (timespecisset(&it->it_time.it_value)) {
1564 ts = it->it_time.it_value;
1565 timespecsub(&ts, &cts);
1566 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1567 callout_reset(&it->it_callout, tvtohz(&tv),
1568 realtimer_expire, it);
1569 }
1570 itimer_enter(it);
1571 ITIMER_UNLOCK(it);
1572 itimer_fire(it);
1573 ITIMER_LOCK(it);
1574 itimer_leave(it);
1575 } else if (timespecisset(&it->it_time.it_value)) {
1576 ts = it->it_time.it_value;
1577 timespecsub(&ts, &cts);
1578 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1579 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire,
1580 it);
1581 }
1582 }
1583
1584 void
1585 itimer_fire(struct itimer *it)
1586 {
1587 struct proc *p = it->it_proc;
1588 struct thread *td;
1589
1590 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1591 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1592 if (sigev_findtd(p, &it->it_sigev, &td) != 0) {
1593 ITIMER_LOCK(it);
1594 timespecclear(&it->it_time.it_value);
1595 timespecclear(&it->it_time.it_interval);
1596 callout_stop(&it->it_callout);
1597 ITIMER_UNLOCK(it);
1598 return;
1599 }
1600 if (!KSI_ONQ(&it->it_ksi)) {
1601 it->it_ksi.ksi_errno = 0;
1602 ksiginfo_set_sigev(&it->it_ksi, &it->it_sigev);
1603 tdsendsignal(p, td, it->it_ksi.ksi_signo, &it->it_ksi);
1604 } else {
1605 if (it->it_overrun < INT_MAX)
1606 it->it_overrun++;
1607 else
1608 it->it_ksi.ksi_errno = ERANGE;
1609 }
1610 PROC_UNLOCK(p);
1611 }
1612 }
1613
1614 static void
1615 itimers_alloc(struct proc *p)
1616 {
1617 struct itimers *its;
1618 int i;
1619
1620 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO);
1621 LIST_INIT(&its->its_virtual);
1622 LIST_INIT(&its->its_prof);
1623 TAILQ_INIT(&its->its_worklist);
1624 for (i = 0; i < TIMER_MAX; i++)
1625 its->its_timers[i] = NULL;
1626 PROC_LOCK(p);
1627 if (p->p_itimers == NULL) {
1628 p->p_itimers = its;
1629 PROC_UNLOCK(p);
1630 }
1631 else {
1632 PROC_UNLOCK(p);
1633 free(its, M_SUBPROC);
1634 }
1635 }
1636
1637 static void
1638 itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp __unused)
1639 {
1640 itimers_event_hook_exit(arg, p);
1641 }
1642
1643 /* Clean up timers when some process events are being triggered. */
1644 static void
1645 itimers_event_hook_exit(void *arg, struct proc *p)
1646 {
1647 struct itimers *its;
1648 struct itimer *it;
1649 int event = (int)(intptr_t)arg;
1650 int i;
1651
1652 if (p->p_itimers != NULL) {
1653 its = p->p_itimers;
1654 for (i = 0; i < MAX_CLOCKS; ++i) {
1655 if (posix_clocks[i].event_hook != NULL)
1656 CLOCK_CALL(i, event_hook, (p, i, event));
1657 }
1658 /*
1659 * According to susv3, XSI interval timers should be inherited
1660 * by new image.
1661 */
1662 if (event == ITIMER_EV_EXEC)
1663 i = 3;
1664 else if (event == ITIMER_EV_EXIT)
1665 i = 0;
1666 else
1667 panic("unhandled event");
1668 for (; i < TIMER_MAX; ++i) {
1669 if ((it = its->its_timers[i]) != NULL)
1670 kern_ktimer_delete(curthread, i);
1671 }
1672 if (its->its_timers[0] == NULL &&
1673 its->its_timers[1] == NULL &&
1674 its->its_timers[2] == NULL) {
1675 free(its, M_SUBPROC);
1676 p->p_itimers = NULL;
1677 }
1678 }
1679 }
Cache object: 11127030c8204d882c6f34f4b7261437
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