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 <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 #define CPUCLOCK_BIT 0x80000000
62 #define CPUCLOCK_PROCESS_BIT 0x40000000
63 #define CPUCLOCK_ID_MASK (~(CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT))
64 #define MAKE_THREAD_CPUCLOCK(tid) (CPUCLOCK_BIT|(tid))
65 #define MAKE_PROCESS_CPUCLOCK(pid) \
66 (CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT|(pid))
67
68 static struct kclock posix_clocks[MAX_CLOCKS];
69 static uma_zone_t itimer_zone = NULL;
70
71 /*
72 * Time of day and interval timer support.
73 *
74 * These routines provide the kernel entry points to get and set
75 * the time-of-day and per-process interval timers. Subroutines
76 * here provide support for adding and subtracting timeval structures
77 * and decrementing interval timers, optionally reloading the interval
78 * timers when they expire.
79 */
80
81 static int settime(struct thread *, struct timeval *);
82 static void timevalfix(struct timeval *);
83
84 static void itimer_start(void);
85 static int itimer_init(void *, int, int);
86 static void itimer_fini(void *, int);
87 static void itimer_enter(struct itimer *);
88 static void itimer_leave(struct itimer *);
89 static struct itimer *itimer_find(struct proc *, int);
90 static void itimers_alloc(struct proc *);
91 static void itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp);
92 static void itimers_event_hook_exit(void *arg, struct proc *p);
93 static int realtimer_create(struct itimer *);
94 static int realtimer_gettime(struct itimer *, struct itimerspec *);
95 static int realtimer_settime(struct itimer *, int,
96 struct itimerspec *, struct itimerspec *);
97 static int realtimer_delete(struct itimer *);
98 static void realtimer_clocktime(clockid_t, struct timespec *);
99 static void realtimer_expire(void *);
100
101 int register_posix_clock(int, struct kclock *);
102 void itimer_fire(struct itimer *it);
103 int itimespecfix(struct timespec *ts);
104
105 #define CLOCK_CALL(clock, call, arglist) \
106 ((*posix_clocks[clock].call) arglist)
107
108 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL);
109
110
111 static int
112 settime(struct thread *td, struct timeval *tv)
113 {
114 struct timeval delta, tv1, tv2;
115 static struct timeval maxtime, laststep;
116 struct timespec ts;
117 int s;
118
119 s = splclock();
120 microtime(&tv1);
121 delta = *tv;
122 timevalsub(&delta, &tv1);
123
124 /*
125 * If the system is secure, we do not allow the time to be
126 * set to a value earlier than 1 second less than the highest
127 * time we have yet seen. The worst a miscreant can do in
128 * this circumstance is "freeze" time. He couldn't go
129 * back to the past.
130 *
131 * We similarly do not allow the clock to be stepped more
132 * than one second, nor more than once per second. This allows
133 * a miscreant to make the clock march double-time, but no worse.
134 */
135 if (securelevel_gt(td->td_ucred, 1) != 0) {
136 if (delta.tv_sec < 0 || delta.tv_usec < 0) {
137 /*
138 * Update maxtime to latest time we've seen.
139 */
140 if (tv1.tv_sec > maxtime.tv_sec)
141 maxtime = tv1;
142 tv2 = *tv;
143 timevalsub(&tv2, &maxtime);
144 if (tv2.tv_sec < -1) {
145 tv->tv_sec = maxtime.tv_sec - 1;
146 printf("Time adjustment clamped to -1 second\n");
147 }
148 } else {
149 if (tv1.tv_sec == laststep.tv_sec) {
150 splx(s);
151 return (EPERM);
152 }
153 if (delta.tv_sec > 1) {
154 tv->tv_sec = tv1.tv_sec + 1;
155 printf("Time adjustment clamped to +1 second\n");
156 }
157 laststep = *tv;
158 }
159 }
160
161 ts.tv_sec = tv->tv_sec;
162 ts.tv_nsec = tv->tv_usec * 1000;
163 mtx_lock(&Giant);
164 tc_setclock(&ts);
165 resettodr();
166 mtx_unlock(&Giant);
167 return (0);
168 }
169
170 #ifndef _SYS_SYSPROTO_H_
171 struct clock_getcpuclockid2_args {
172 id_t id;
173 int which,
174 clockid_t *clock_id;
175 };
176 #endif
177 /* ARGSUSED */
178 int
179 sys_clock_getcpuclockid2(struct thread *td, struct clock_getcpuclockid2_args *uap)
180 {
181 clockid_t clk_id;
182 int error;
183
184 error = kern_clock_getcpuclockid2(td, uap->id, uap->which, &clk_id);
185 if (error == 0)
186 error = copyout(&clk_id, uap->clock_id, sizeof(clockid_t));
187 return (error);
188 }
189
190 int
191 kern_clock_getcpuclockid2(struct thread *td, id_t id, int which,
192 clockid_t *clk_id)
193 {
194 struct proc *p;
195 pid_t pid;
196 lwpid_t tid;
197 int error;
198
199 switch (which) {
200 case CPUCLOCK_WHICH_PID:
201 if (id != 0) {
202 error = pget(id, PGET_CANSEE | PGET_NOTID, &p);
203 if (error != 0)
204 return (error);
205 PROC_UNLOCK(p);
206 pid = id;
207 } else {
208 pid = td->td_proc->p_pid;
209 }
210 *clk_id = MAKE_PROCESS_CPUCLOCK(pid);
211 return (0);
212 case CPUCLOCK_WHICH_TID:
213 tid = id == 0 ? td->td_tid : id;
214 *clk_id = MAKE_THREAD_CPUCLOCK(tid);
215 return (0);
216 default:
217 return (EINVAL);
218 }
219 }
220
221 #ifndef _SYS_SYSPROTO_H_
222 struct clock_gettime_args {
223 clockid_t clock_id;
224 struct timespec *tp;
225 };
226 #endif
227 /* ARGSUSED */
228 int
229 sys_clock_gettime(struct thread *td, struct clock_gettime_args *uap)
230 {
231 struct timespec ats;
232 int error;
233
234 error = kern_clock_gettime(td, uap->clock_id, &ats);
235 if (error == 0)
236 error = copyout(&ats, uap->tp, sizeof(ats));
237
238 return (error);
239 }
240
241 static inline void
242 cputick2timespec(uint64_t runtime, struct timespec *ats)
243 {
244 runtime = cputick2usec(runtime);
245 ats->tv_sec = runtime / 1000000;
246 ats->tv_nsec = runtime % 1000000 * 1000;
247 }
248
249 static void
250 get_thread_cputime(struct thread *targettd, struct timespec *ats)
251 {
252 uint64_t runtime, curtime, switchtime;
253
254 if (targettd == NULL) { /* current thread */
255 critical_enter();
256 switchtime = PCPU_GET(switchtime);
257 curtime = cpu_ticks();
258 runtime = curthread->td_runtime;
259 critical_exit();
260 runtime += curtime - switchtime;
261 } else {
262 thread_lock(targettd);
263 runtime = targettd->td_runtime;
264 thread_unlock(targettd);
265 }
266 cputick2timespec(runtime, ats);
267 }
268
269 static void
270 get_process_cputime(struct proc *targetp, struct timespec *ats)
271 {
272 uint64_t runtime;
273 struct rusage ru;
274
275 PROC_SLOCK(targetp);
276 rufetch(targetp, &ru);
277 runtime = targetp->p_rux.rux_runtime;
278 PROC_SUNLOCK(targetp);
279 cputick2timespec(runtime, ats);
280 }
281
282 static int
283 get_cputime(struct thread *td, clockid_t clock_id, struct timespec *ats)
284 {
285 struct proc *p, *p2;
286 struct thread *td2;
287 lwpid_t tid;
288 pid_t pid;
289 int error;
290
291 p = td->td_proc;
292 if ((clock_id & CPUCLOCK_PROCESS_BIT) == 0) {
293 tid = clock_id & CPUCLOCK_ID_MASK;
294 td2 = tdfind(tid, p->p_pid);
295 if (td2 == NULL)
296 return (EINVAL);
297 get_thread_cputime(td2, ats);
298 PROC_UNLOCK(td2->td_proc);
299 } else {
300 pid = clock_id & CPUCLOCK_ID_MASK;
301 error = pget(pid, PGET_CANSEE, &p2);
302 if (error != 0)
303 return (EINVAL);
304 get_process_cputime(p2, ats);
305 PROC_UNLOCK(p2);
306 }
307 return (0);
308 }
309
310 int
311 kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
312 {
313 struct timeval sys, user;
314 struct proc *p;
315
316 p = td->td_proc;
317 switch (clock_id) {
318 case CLOCK_REALTIME: /* Default to precise. */
319 case CLOCK_REALTIME_PRECISE:
320 nanotime(ats);
321 break;
322 case CLOCK_REALTIME_FAST:
323 getnanotime(ats);
324 break;
325 case CLOCK_VIRTUAL:
326 PROC_LOCK(p);
327 PROC_SLOCK(p);
328 calcru(p, &user, &sys);
329 PROC_SUNLOCK(p);
330 PROC_UNLOCK(p);
331 TIMEVAL_TO_TIMESPEC(&user, ats);
332 break;
333 case CLOCK_PROF:
334 PROC_LOCK(p);
335 PROC_SLOCK(p);
336 calcru(p, &user, &sys);
337 PROC_SUNLOCK(p);
338 PROC_UNLOCK(p);
339 timevaladd(&user, &sys);
340 TIMEVAL_TO_TIMESPEC(&user, ats);
341 break;
342 case CLOCK_MONOTONIC: /* Default to precise. */
343 case CLOCK_MONOTONIC_PRECISE:
344 case CLOCK_UPTIME:
345 case CLOCK_UPTIME_PRECISE:
346 nanouptime(ats);
347 break;
348 case CLOCK_UPTIME_FAST:
349 case CLOCK_MONOTONIC_FAST:
350 getnanouptime(ats);
351 break;
352 case CLOCK_SECOND:
353 ats->tv_sec = time_second;
354 ats->tv_nsec = 0;
355 break;
356 case CLOCK_THREAD_CPUTIME_ID:
357 get_thread_cputime(NULL, ats);
358 break;
359 case CLOCK_PROCESS_CPUTIME_ID:
360 PROC_LOCK(p);
361 get_process_cputime(p, ats);
362 PROC_UNLOCK(p);
363 break;
364 default:
365 if ((int)clock_id >= 0)
366 return (EINVAL);
367 return (get_cputime(td, clock_id, ats));
368 }
369 return (0);
370 }
371
372 #ifndef _SYS_SYSPROTO_H_
373 struct clock_settime_args {
374 clockid_t clock_id;
375 const struct timespec *tp;
376 };
377 #endif
378 /* ARGSUSED */
379 int
380 sys_clock_settime(struct thread *td, struct clock_settime_args *uap)
381 {
382 struct timespec ats;
383 int error;
384
385 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0)
386 return (error);
387 return (kern_clock_settime(td, uap->clock_id, &ats));
388 }
389
390 int
391 kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats)
392 {
393 struct timeval atv;
394 int error;
395
396 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0)
397 return (error);
398 if (clock_id != CLOCK_REALTIME)
399 return (EINVAL);
400 if (ats->tv_nsec < 0 || ats->tv_nsec >= 1000000000)
401 return (EINVAL);
402 /* XXX Don't convert nsec->usec and back */
403 TIMESPEC_TO_TIMEVAL(&atv, ats);
404 error = settime(td, &atv);
405 return (error);
406 }
407
408 #ifndef _SYS_SYSPROTO_H_
409 struct clock_getres_args {
410 clockid_t clock_id;
411 struct timespec *tp;
412 };
413 #endif
414 int
415 sys_clock_getres(struct thread *td, struct clock_getres_args *uap)
416 {
417 struct timespec ts;
418 int error;
419
420 if (uap->tp == NULL)
421 return (0);
422
423 error = kern_clock_getres(td, uap->clock_id, &ts);
424 if (error == 0)
425 error = copyout(&ts, uap->tp, sizeof(ts));
426 return (error);
427 }
428
429 int
430 kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
431 {
432
433 ts->tv_sec = 0;
434 switch (clock_id) {
435 case CLOCK_REALTIME:
436 case CLOCK_REALTIME_FAST:
437 case CLOCK_REALTIME_PRECISE:
438 case CLOCK_MONOTONIC:
439 case CLOCK_MONOTONIC_FAST:
440 case CLOCK_MONOTONIC_PRECISE:
441 case CLOCK_UPTIME:
442 case CLOCK_UPTIME_FAST:
443 case CLOCK_UPTIME_PRECISE:
444 /*
445 * Round up the result of the division cheaply by adding 1.
446 * Rounding up is especially important if rounding down
447 * would give 0. Perfect rounding is unimportant.
448 */
449 ts->tv_nsec = 1000000000 / tc_getfrequency() + 1;
450 break;
451 case CLOCK_VIRTUAL:
452 case CLOCK_PROF:
453 /* Accurately round up here because we can do so cheaply. */
454 ts->tv_nsec = (1000000000 + hz - 1) / hz;
455 break;
456 case CLOCK_SECOND:
457 ts->tv_sec = 1;
458 ts->tv_nsec = 0;
459 break;
460 case CLOCK_THREAD_CPUTIME_ID:
461 case CLOCK_PROCESS_CPUTIME_ID:
462 cputime:
463 /* sync with cputick2usec */
464 ts->tv_nsec = 1000000 / cpu_tickrate();
465 if (ts->tv_nsec == 0)
466 ts->tv_nsec = 1000;
467 break;
468 default:
469 if ((int)clock_id < 0)
470 goto cputime;
471 return (EINVAL);
472 }
473 return (0);
474 }
475
476 static int nanowait;
477
478 int
479 kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt)
480 {
481 struct timespec ts, ts2, ts3;
482 struct timeval tv;
483 int error;
484
485 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000)
486 return (EINVAL);
487 if (rqt->tv_sec < 0 || (rqt->tv_sec == 0 && rqt->tv_nsec == 0))
488 return (0);
489 getnanouptime(&ts);
490 timespecadd(&ts, rqt);
491 TIMESPEC_TO_TIMEVAL(&tv, rqt);
492 for (;;) {
493 error = tsleep(&nanowait, PWAIT | PCATCH, "nanslp",
494 tvtohz(&tv));
495 getnanouptime(&ts2);
496 if (error != EWOULDBLOCK) {
497 if (error == ERESTART)
498 error = EINTR;
499 if (rmt != NULL) {
500 timespecsub(&ts, &ts2);
501 if (ts.tv_sec < 0)
502 timespecclear(&ts);
503 *rmt = ts;
504 }
505 return (error);
506 }
507 if (timespeccmp(&ts2, &ts, >=))
508 return (0);
509 ts3 = ts;
510 timespecsub(&ts3, &ts2);
511 TIMESPEC_TO_TIMEVAL(&tv, &ts3);
512 }
513 }
514
515 #ifndef _SYS_SYSPROTO_H_
516 struct nanosleep_args {
517 struct timespec *rqtp;
518 struct timespec *rmtp;
519 };
520 #endif
521 /* ARGSUSED */
522 int
523 sys_nanosleep(struct thread *td, struct nanosleep_args *uap)
524 {
525 struct timespec rmt, rqt;
526 int error;
527
528 error = copyin(uap->rqtp, &rqt, sizeof(rqt));
529 if (error)
530 return (error);
531
532 if (uap->rmtp &&
533 !useracc((caddr_t)uap->rmtp, sizeof(rmt), VM_PROT_WRITE))
534 return (EFAULT);
535 error = kern_nanosleep(td, &rqt, &rmt);
536 if (error && uap->rmtp) {
537 int error2;
538
539 error2 = copyout(&rmt, uap->rmtp, sizeof(rmt));
540 if (error2)
541 error = error2;
542 }
543 return (error);
544 }
545
546 #ifndef _SYS_SYSPROTO_H_
547 struct gettimeofday_args {
548 struct timeval *tp;
549 struct timezone *tzp;
550 };
551 #endif
552 /* ARGSUSED */
553 int
554 sys_gettimeofday(struct thread *td, struct gettimeofday_args *uap)
555 {
556 struct timeval atv;
557 struct timezone rtz;
558 int error = 0;
559
560 if (uap->tp) {
561 microtime(&atv);
562 error = copyout(&atv, uap->tp, sizeof (atv));
563 }
564 if (error == 0 && uap->tzp != NULL) {
565 rtz.tz_minuteswest = tz_minuteswest;
566 rtz.tz_dsttime = tz_dsttime;
567 error = copyout(&rtz, uap->tzp, sizeof (rtz));
568 }
569 return (error);
570 }
571
572 #ifndef _SYS_SYSPROTO_H_
573 struct settimeofday_args {
574 struct timeval *tv;
575 struct timezone *tzp;
576 };
577 #endif
578 /* ARGSUSED */
579 int
580 sys_settimeofday(struct thread *td, struct settimeofday_args *uap)
581 {
582 struct timeval atv, *tvp;
583 struct timezone atz, *tzp;
584 int error;
585
586 if (uap->tv) {
587 error = copyin(uap->tv, &atv, sizeof(atv));
588 if (error)
589 return (error);
590 tvp = &atv;
591 } else
592 tvp = NULL;
593 if (uap->tzp) {
594 error = copyin(uap->tzp, &atz, sizeof(atz));
595 if (error)
596 return (error);
597 tzp = &atz;
598 } else
599 tzp = NULL;
600 return (kern_settimeofday(td, tvp, tzp));
601 }
602
603 int
604 kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp)
605 {
606 int error;
607
608 error = priv_check(td, PRIV_SETTIMEOFDAY);
609 if (error)
610 return (error);
611 /* Verify all parameters before changing time. */
612 if (tv) {
613 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000)
614 return (EINVAL);
615 error = settime(td, tv);
616 }
617 if (tzp && error == 0) {
618 tz_minuteswest = tzp->tz_minuteswest;
619 tz_dsttime = tzp->tz_dsttime;
620 }
621 return (error);
622 }
623
624 /*
625 * Get value of an interval timer. The process virtual and profiling virtual
626 * time timers are kept in the p_stats area, since they can be swapped out.
627 * These are kept internally in the way they are specified externally: in
628 * time until they expire.
629 *
630 * The real time interval timer is kept in the process table slot for the
631 * process, and its value (it_value) is kept as an absolute time rather than
632 * as a delta, so that it is easy to keep periodic real-time signals from
633 * drifting.
634 *
635 * Virtual time timers are processed in the hardclock() routine of
636 * kern_clock.c. The real time timer is processed by a timeout routine,
637 * called from the softclock() routine. Since a callout may be delayed in
638 * real time due to interrupt processing in the system, it is possible for
639 * the real time timeout routine (realitexpire, given below), to be delayed
640 * in real time past when it is supposed to occur. It does not suffice,
641 * therefore, to reload the real timer .it_value from the real time timers
642 * .it_interval. Rather, we compute the next time in absolute time the timer
643 * should go off.
644 */
645 #ifndef _SYS_SYSPROTO_H_
646 struct getitimer_args {
647 u_int which;
648 struct itimerval *itv;
649 };
650 #endif
651 int
652 sys_getitimer(struct thread *td, struct getitimer_args *uap)
653 {
654 struct itimerval aitv;
655 int error;
656
657 error = kern_getitimer(td, uap->which, &aitv);
658 if (error != 0)
659 return (error);
660 return (copyout(&aitv, uap->itv, sizeof (struct itimerval)));
661 }
662
663 int
664 kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv)
665 {
666 struct proc *p = td->td_proc;
667 struct timeval ctv;
668
669 if (which > ITIMER_PROF)
670 return (EINVAL);
671
672 if (which == ITIMER_REAL) {
673 /*
674 * Convert from absolute to relative time in .it_value
675 * part of real time timer. If time for real time timer
676 * has passed return 0, else return difference between
677 * current time and time for the timer to go off.
678 */
679 PROC_LOCK(p);
680 *aitv = p->p_realtimer;
681 PROC_UNLOCK(p);
682 if (timevalisset(&aitv->it_value)) {
683 getmicrouptime(&ctv);
684 if (timevalcmp(&aitv->it_value, &ctv, <))
685 timevalclear(&aitv->it_value);
686 else
687 timevalsub(&aitv->it_value, &ctv);
688 }
689 } else {
690 PROC_SLOCK(p);
691 *aitv = p->p_stats->p_timer[which];
692 PROC_SUNLOCK(p);
693 }
694 return (0);
695 }
696
697 #ifndef _SYS_SYSPROTO_H_
698 struct setitimer_args {
699 u_int which;
700 struct itimerval *itv, *oitv;
701 };
702 #endif
703 int
704 sys_setitimer(struct thread *td, struct setitimer_args *uap)
705 {
706 struct itimerval aitv, oitv;
707 int error;
708
709 if (uap->itv == NULL) {
710 uap->itv = uap->oitv;
711 return (sys_getitimer(td, (struct getitimer_args *)uap));
712 }
713
714 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval))))
715 return (error);
716 error = kern_setitimer(td, uap->which, &aitv, &oitv);
717 if (error != 0 || uap->oitv == NULL)
718 return (error);
719 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval)));
720 }
721
722 int
723 kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv,
724 struct itimerval *oitv)
725 {
726 struct proc *p = td->td_proc;
727 struct timeval ctv;
728
729 if (aitv == NULL)
730 return (kern_getitimer(td, which, oitv));
731
732 if (which > ITIMER_PROF)
733 return (EINVAL);
734 if (itimerfix(&aitv->it_value))
735 return (EINVAL);
736 if (!timevalisset(&aitv->it_value))
737 timevalclear(&aitv->it_interval);
738 else if (itimerfix(&aitv->it_interval))
739 return (EINVAL);
740
741 if (which == ITIMER_REAL) {
742 PROC_LOCK(p);
743 if (timevalisset(&p->p_realtimer.it_value))
744 callout_stop(&p->p_itcallout);
745 getmicrouptime(&ctv);
746 if (timevalisset(&aitv->it_value)) {
747 callout_reset(&p->p_itcallout, tvtohz(&aitv->it_value),
748 realitexpire, p);
749 timevaladd(&aitv->it_value, &ctv);
750 }
751 *oitv = p->p_realtimer;
752 p->p_realtimer = *aitv;
753 PROC_UNLOCK(p);
754 if (timevalisset(&oitv->it_value)) {
755 if (timevalcmp(&oitv->it_value, &ctv, <))
756 timevalclear(&oitv->it_value);
757 else
758 timevalsub(&oitv->it_value, &ctv);
759 }
760 } else {
761 PROC_SLOCK(p);
762 *oitv = p->p_stats->p_timer[which];
763 p->p_stats->p_timer[which] = *aitv;
764 PROC_SUNLOCK(p);
765 }
766 return (0);
767 }
768
769 /*
770 * Real interval timer expired:
771 * send process whose timer expired an alarm signal.
772 * If time is not set up to reload, then just return.
773 * Else compute next time timer should go off which is > current time.
774 * This is where delay in processing this timeout causes multiple
775 * SIGALRM calls to be compressed into one.
776 * tvtohz() always adds 1 to allow for the time until the next clock
777 * interrupt being strictly less than 1 clock tick, but we don't want
778 * that here since we want to appear to be in sync with the clock
779 * interrupt even when we're delayed.
780 */
781 void
782 realitexpire(void *arg)
783 {
784 struct proc *p;
785 struct timeval ctv, ntv;
786
787 p = (struct proc *)arg;
788 kern_psignal(p, SIGALRM);
789 if (!timevalisset(&p->p_realtimer.it_interval)) {
790 timevalclear(&p->p_realtimer.it_value);
791 if (p->p_flag & P_WEXIT)
792 wakeup(&p->p_itcallout);
793 return;
794 }
795 for (;;) {
796 timevaladd(&p->p_realtimer.it_value,
797 &p->p_realtimer.it_interval);
798 getmicrouptime(&ctv);
799 if (timevalcmp(&p->p_realtimer.it_value, &ctv, >)) {
800 ntv = p->p_realtimer.it_value;
801 timevalsub(&ntv, &ctv);
802 callout_reset(&p->p_itcallout, tvtohz(&ntv) - 1,
803 realitexpire, p);
804 return;
805 }
806 }
807 /*NOTREACHED*/
808 }
809
810 /*
811 * Check that a proposed value to load into the .it_value or
812 * .it_interval part of an interval timer is acceptable, and
813 * fix it to have at least minimal value (i.e. if it is less
814 * than the resolution of the clock, round it up.)
815 */
816 int
817 itimerfix(struct timeval *tv)
818 {
819
820 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000)
821 return (EINVAL);
822 if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick)
823 tv->tv_usec = tick;
824 return (0);
825 }
826
827 /*
828 * Decrement an interval timer by a specified number
829 * of microseconds, which must be less than a second,
830 * i.e. < 1000000. If the timer expires, then reload
831 * it. In this case, carry over (usec - old value) to
832 * reduce the value reloaded into the timer so that
833 * the timer does not drift. This routine assumes
834 * that it is called in a context where the timers
835 * on which it is operating cannot change in value.
836 */
837 int
838 itimerdecr(struct itimerval *itp, int usec)
839 {
840
841 if (itp->it_value.tv_usec < usec) {
842 if (itp->it_value.tv_sec == 0) {
843 /* expired, and already in next interval */
844 usec -= itp->it_value.tv_usec;
845 goto expire;
846 }
847 itp->it_value.tv_usec += 1000000;
848 itp->it_value.tv_sec--;
849 }
850 itp->it_value.tv_usec -= usec;
851 usec = 0;
852 if (timevalisset(&itp->it_value))
853 return (1);
854 /* expired, exactly at end of interval */
855 expire:
856 if (timevalisset(&itp->it_interval)) {
857 itp->it_value = itp->it_interval;
858 itp->it_value.tv_usec -= usec;
859 if (itp->it_value.tv_usec < 0) {
860 itp->it_value.tv_usec += 1000000;
861 itp->it_value.tv_sec--;
862 }
863 } else
864 itp->it_value.tv_usec = 0; /* sec is already 0 */
865 return (0);
866 }
867
868 /*
869 * Add and subtract routines for timevals.
870 * N.B.: subtract routine doesn't deal with
871 * results which are before the beginning,
872 * it just gets very confused in this case.
873 * Caveat emptor.
874 */
875 void
876 timevaladd(struct timeval *t1, const struct timeval *t2)
877 {
878
879 t1->tv_sec += t2->tv_sec;
880 t1->tv_usec += t2->tv_usec;
881 timevalfix(t1);
882 }
883
884 void
885 timevalsub(struct timeval *t1, const struct timeval *t2)
886 {
887
888 t1->tv_sec -= t2->tv_sec;
889 t1->tv_usec -= t2->tv_usec;
890 timevalfix(t1);
891 }
892
893 static void
894 timevalfix(struct timeval *t1)
895 {
896
897 if (t1->tv_usec < 0) {
898 t1->tv_sec--;
899 t1->tv_usec += 1000000;
900 }
901 if (t1->tv_usec >= 1000000) {
902 t1->tv_sec++;
903 t1->tv_usec -= 1000000;
904 }
905 }
906
907 /*
908 * ratecheck(): simple time-based rate-limit checking.
909 */
910 int
911 ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
912 {
913 struct timeval tv, delta;
914 int rv = 0;
915
916 getmicrouptime(&tv); /* NB: 10ms precision */
917 delta = tv;
918 timevalsub(&delta, lasttime);
919
920 /*
921 * check for 0,0 is so that the message will be seen at least once,
922 * even if interval is huge.
923 */
924 if (timevalcmp(&delta, mininterval, >=) ||
925 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
926 *lasttime = tv;
927 rv = 1;
928 }
929
930 return (rv);
931 }
932
933 /*
934 * ppsratecheck(): packets (or events) per second limitation.
935 *
936 * Return 0 if the limit is to be enforced (e.g. the caller
937 * should drop a packet because of the rate limitation).
938 *
939 * maxpps of 0 always causes zero to be returned. maxpps of -1
940 * always causes 1 to be returned; this effectively defeats rate
941 * limiting.
942 *
943 * Note that we maintain the struct timeval for compatibility
944 * with other bsd systems. We reuse the storage and just monitor
945 * clock ticks for minimal overhead.
946 */
947 int
948 ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
949 {
950 int now;
951
952 /*
953 * Reset the last time and counter if this is the first call
954 * or more than a second has passed since the last update of
955 * lasttime.
956 */
957 now = ticks;
958 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) {
959 lasttime->tv_sec = now;
960 *curpps = 1;
961 return (maxpps != 0);
962 } else {
963 (*curpps)++; /* NB: ignore potential overflow */
964 return (maxpps < 0 || *curpps < maxpps);
965 }
966 }
967
968 static void
969 itimer_start(void)
970 {
971 struct kclock rt_clock = {
972 .timer_create = realtimer_create,
973 .timer_delete = realtimer_delete,
974 .timer_settime = realtimer_settime,
975 .timer_gettime = realtimer_gettime,
976 .event_hook = NULL
977 };
978
979 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer),
980 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0);
981 register_posix_clock(CLOCK_REALTIME, &rt_clock);
982 register_posix_clock(CLOCK_MONOTONIC, &rt_clock);
983 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L);
984 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX);
985 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX);
986 EVENTHANDLER_REGISTER(process_exit, itimers_event_hook_exit,
987 (void *)ITIMER_EV_EXIT, EVENTHANDLER_PRI_ANY);
988 EVENTHANDLER_REGISTER(process_exec, itimers_event_hook_exec,
989 (void *)ITIMER_EV_EXEC, EVENTHANDLER_PRI_ANY);
990 }
991
992 int
993 register_posix_clock(int clockid, struct kclock *clk)
994 {
995 if ((unsigned)clockid >= MAX_CLOCKS) {
996 printf("%s: invalid clockid\n", __func__);
997 return (0);
998 }
999 posix_clocks[clockid] = *clk;
1000 return (1);
1001 }
1002
1003 static int
1004 itimer_init(void *mem, int size, int flags)
1005 {
1006 struct itimer *it;
1007
1008 it = (struct itimer *)mem;
1009 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF);
1010 return (0);
1011 }
1012
1013 static void
1014 itimer_fini(void *mem, int size)
1015 {
1016 struct itimer *it;
1017
1018 it = (struct itimer *)mem;
1019 mtx_destroy(&it->it_mtx);
1020 }
1021
1022 static void
1023 itimer_enter(struct itimer *it)
1024 {
1025
1026 mtx_assert(&it->it_mtx, MA_OWNED);
1027 it->it_usecount++;
1028 }
1029
1030 static void
1031 itimer_leave(struct itimer *it)
1032 {
1033
1034 mtx_assert(&it->it_mtx, MA_OWNED);
1035 KASSERT(it->it_usecount > 0, ("invalid it_usecount"));
1036
1037 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0)
1038 wakeup(it);
1039 }
1040
1041 #ifndef _SYS_SYSPROTO_H_
1042 struct ktimer_create_args {
1043 clockid_t clock_id;
1044 struct sigevent * evp;
1045 int * timerid;
1046 };
1047 #endif
1048 int
1049 sys_ktimer_create(struct thread *td, struct ktimer_create_args *uap)
1050 {
1051 struct sigevent *evp, ev;
1052 int id;
1053 int error;
1054
1055 if (uap->evp == NULL) {
1056 evp = NULL;
1057 } else {
1058 error = copyin(uap->evp, &ev, sizeof(ev));
1059 if (error != 0)
1060 return (error);
1061 evp = &ev;
1062 }
1063 error = kern_ktimer_create(td, uap->clock_id, evp, &id, -1);
1064 if (error == 0) {
1065 error = copyout(&id, uap->timerid, sizeof(int));
1066 if (error != 0)
1067 kern_ktimer_delete(td, id);
1068 }
1069 return (error);
1070 }
1071
1072 int
1073 kern_ktimer_create(struct thread *td, clockid_t clock_id, struct sigevent *evp,
1074 int *timerid, int preset_id)
1075 {
1076 struct proc *p = td->td_proc;
1077 struct itimer *it;
1078 int id;
1079 int error;
1080
1081 if (clock_id < 0 || clock_id >= MAX_CLOCKS)
1082 return (EINVAL);
1083
1084 if (posix_clocks[clock_id].timer_create == NULL)
1085 return (EINVAL);
1086
1087 if (evp != NULL) {
1088 if (evp->sigev_notify != SIGEV_NONE &&
1089 evp->sigev_notify != SIGEV_SIGNAL &&
1090 evp->sigev_notify != SIGEV_THREAD_ID)
1091 return (EINVAL);
1092 if ((evp->sigev_notify == SIGEV_SIGNAL ||
1093 evp->sigev_notify == SIGEV_THREAD_ID) &&
1094 !_SIG_VALID(evp->sigev_signo))
1095 return (EINVAL);
1096 }
1097
1098 if (p->p_itimers == NULL)
1099 itimers_alloc(p);
1100
1101 it = uma_zalloc(itimer_zone, M_WAITOK);
1102 it->it_flags = 0;
1103 it->it_usecount = 0;
1104 it->it_active = 0;
1105 timespecclear(&it->it_time.it_value);
1106 timespecclear(&it->it_time.it_interval);
1107 it->it_overrun = 0;
1108 it->it_overrun_last = 0;
1109 it->it_clockid = clock_id;
1110 it->it_timerid = -1;
1111 it->it_proc = p;
1112 ksiginfo_init(&it->it_ksi);
1113 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT;
1114 error = CLOCK_CALL(clock_id, timer_create, (it));
1115 if (error != 0)
1116 goto out;
1117
1118 PROC_LOCK(p);
1119 if (preset_id != -1) {
1120 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id"));
1121 id = preset_id;
1122 if (p->p_itimers->its_timers[id] != NULL) {
1123 PROC_UNLOCK(p);
1124 error = 0;
1125 goto out;
1126 }
1127 } else {
1128 /*
1129 * Find a free timer slot, skipping those reserved
1130 * for setitimer().
1131 */
1132 for (id = 3; id < TIMER_MAX; id++)
1133 if (p->p_itimers->its_timers[id] == NULL)
1134 break;
1135 if (id == TIMER_MAX) {
1136 PROC_UNLOCK(p);
1137 error = EAGAIN;
1138 goto out;
1139 }
1140 }
1141 it->it_timerid = id;
1142 p->p_itimers->its_timers[id] = it;
1143 if (evp != NULL)
1144 it->it_sigev = *evp;
1145 else {
1146 it->it_sigev.sigev_notify = SIGEV_SIGNAL;
1147 switch (clock_id) {
1148 default:
1149 case CLOCK_REALTIME:
1150 it->it_sigev.sigev_signo = SIGALRM;
1151 break;
1152 case CLOCK_VIRTUAL:
1153 it->it_sigev.sigev_signo = SIGVTALRM;
1154 break;
1155 case CLOCK_PROF:
1156 it->it_sigev.sigev_signo = SIGPROF;
1157 break;
1158 }
1159 it->it_sigev.sigev_value.sival_int = id;
1160 }
1161
1162 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1163 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1164 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo;
1165 it->it_ksi.ksi_code = SI_TIMER;
1166 it->it_ksi.ksi_value = it->it_sigev.sigev_value;
1167 it->it_ksi.ksi_timerid = id;
1168 }
1169 PROC_UNLOCK(p);
1170 *timerid = id;
1171 return (0);
1172
1173 out:
1174 ITIMER_LOCK(it);
1175 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1176 ITIMER_UNLOCK(it);
1177 uma_zfree(itimer_zone, it);
1178 return (error);
1179 }
1180
1181 #ifndef _SYS_SYSPROTO_H_
1182 struct ktimer_delete_args {
1183 int timerid;
1184 };
1185 #endif
1186 int
1187 sys_ktimer_delete(struct thread *td, struct ktimer_delete_args *uap)
1188 {
1189
1190 return (kern_ktimer_delete(td, uap->timerid));
1191 }
1192
1193 static struct itimer *
1194 itimer_find(struct proc *p, int timerid)
1195 {
1196 struct itimer *it;
1197
1198 PROC_LOCK_ASSERT(p, MA_OWNED);
1199 if ((p->p_itimers == NULL) ||
1200 (timerid < 0) || (timerid >= TIMER_MAX) ||
1201 (it = p->p_itimers->its_timers[timerid]) == NULL) {
1202 return (NULL);
1203 }
1204 ITIMER_LOCK(it);
1205 if ((it->it_flags & ITF_DELETING) != 0) {
1206 ITIMER_UNLOCK(it);
1207 it = NULL;
1208 }
1209 return (it);
1210 }
1211
1212 int
1213 kern_ktimer_delete(struct thread *td, int timerid)
1214 {
1215 struct proc *p = td->td_proc;
1216 struct itimer *it;
1217
1218 PROC_LOCK(p);
1219 it = itimer_find(p, timerid);
1220 if (it == NULL) {
1221 PROC_UNLOCK(p);
1222 return (EINVAL);
1223 }
1224 PROC_UNLOCK(p);
1225
1226 it->it_flags |= ITF_DELETING;
1227 while (it->it_usecount > 0) {
1228 it->it_flags |= ITF_WANTED;
1229 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0);
1230 }
1231 it->it_flags &= ~ITF_WANTED;
1232 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1233 ITIMER_UNLOCK(it);
1234
1235 PROC_LOCK(p);
1236 if (KSI_ONQ(&it->it_ksi))
1237 sigqueue_take(&it->it_ksi);
1238 p->p_itimers->its_timers[timerid] = NULL;
1239 PROC_UNLOCK(p);
1240 uma_zfree(itimer_zone, it);
1241 return (0);
1242 }
1243
1244 #ifndef _SYS_SYSPROTO_H_
1245 struct ktimer_settime_args {
1246 int timerid;
1247 int flags;
1248 const struct itimerspec * value;
1249 struct itimerspec * ovalue;
1250 };
1251 #endif
1252 int
1253 sys_ktimer_settime(struct thread *td, struct ktimer_settime_args *uap)
1254 {
1255 struct itimerspec val, oval, *ovalp;
1256 int error;
1257
1258 error = copyin(uap->value, &val, sizeof(val));
1259 if (error != 0)
1260 return (error);
1261 ovalp = uap->ovalue != NULL ? &oval : NULL;
1262 error = kern_ktimer_settime(td, uap->timerid, uap->flags, &val, ovalp);
1263 if (error == 0 && uap->ovalue != NULL)
1264 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp));
1265 return (error);
1266 }
1267
1268 int
1269 kern_ktimer_settime(struct thread *td, int timer_id, int flags,
1270 struct itimerspec *val, struct itimerspec *oval)
1271 {
1272 struct proc *p;
1273 struct itimer *it;
1274 int error;
1275
1276 p = td->td_proc;
1277 PROC_LOCK(p);
1278 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1279 PROC_UNLOCK(p);
1280 error = EINVAL;
1281 } else {
1282 PROC_UNLOCK(p);
1283 itimer_enter(it);
1284 error = CLOCK_CALL(it->it_clockid, timer_settime, (it,
1285 flags, val, oval));
1286 itimer_leave(it);
1287 ITIMER_UNLOCK(it);
1288 }
1289 return (error);
1290 }
1291
1292 #ifndef _SYS_SYSPROTO_H_
1293 struct ktimer_gettime_args {
1294 int timerid;
1295 struct itimerspec * value;
1296 };
1297 #endif
1298 int
1299 sys_ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap)
1300 {
1301 struct itimerspec val;
1302 int error;
1303
1304 error = kern_ktimer_gettime(td, uap->timerid, &val);
1305 if (error == 0)
1306 error = copyout(&val, uap->value, sizeof(val));
1307 return (error);
1308 }
1309
1310 int
1311 kern_ktimer_gettime(struct thread *td, int timer_id, struct itimerspec *val)
1312 {
1313 struct proc *p;
1314 struct itimer *it;
1315 int error;
1316
1317 p = td->td_proc;
1318 PROC_LOCK(p);
1319 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1320 PROC_UNLOCK(p);
1321 error = EINVAL;
1322 } else {
1323 PROC_UNLOCK(p);
1324 itimer_enter(it);
1325 error = CLOCK_CALL(it->it_clockid, timer_gettime, (it, val));
1326 itimer_leave(it);
1327 ITIMER_UNLOCK(it);
1328 }
1329 return (error);
1330 }
1331
1332 #ifndef _SYS_SYSPROTO_H_
1333 struct timer_getoverrun_args {
1334 int timerid;
1335 };
1336 #endif
1337 int
1338 sys_ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap)
1339 {
1340
1341 return (kern_ktimer_getoverrun(td, uap->timerid));
1342 }
1343
1344 int
1345 kern_ktimer_getoverrun(struct thread *td, int timer_id)
1346 {
1347 struct proc *p = td->td_proc;
1348 struct itimer *it;
1349 int error ;
1350
1351 PROC_LOCK(p);
1352 if (timer_id < 3 ||
1353 (it = itimer_find(p, timer_id)) == NULL) {
1354 PROC_UNLOCK(p);
1355 error = EINVAL;
1356 } else {
1357 td->td_retval[0] = it->it_overrun_last;
1358 ITIMER_UNLOCK(it);
1359 PROC_UNLOCK(p);
1360 error = 0;
1361 }
1362 return (error);
1363 }
1364
1365 static int
1366 realtimer_create(struct itimer *it)
1367 {
1368 callout_init_mtx(&it->it_callout, &it->it_mtx, 0);
1369 return (0);
1370 }
1371
1372 static int
1373 realtimer_delete(struct itimer *it)
1374 {
1375 mtx_assert(&it->it_mtx, MA_OWNED);
1376
1377 /*
1378 * clear timer's value and interval to tell realtimer_expire
1379 * to not rearm the timer.
1380 */
1381 timespecclear(&it->it_time.it_value);
1382 timespecclear(&it->it_time.it_interval);
1383 ITIMER_UNLOCK(it);
1384 callout_drain(&it->it_callout);
1385 ITIMER_LOCK(it);
1386 return (0);
1387 }
1388
1389 static int
1390 realtimer_gettime(struct itimer *it, struct itimerspec *ovalue)
1391 {
1392 struct timespec cts;
1393
1394 mtx_assert(&it->it_mtx, MA_OWNED);
1395
1396 realtimer_clocktime(it->it_clockid, &cts);
1397 *ovalue = it->it_time;
1398 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) {
1399 timespecsub(&ovalue->it_value, &cts);
1400 if (ovalue->it_value.tv_sec < 0 ||
1401 (ovalue->it_value.tv_sec == 0 &&
1402 ovalue->it_value.tv_nsec == 0)) {
1403 ovalue->it_value.tv_sec = 0;
1404 ovalue->it_value.tv_nsec = 1;
1405 }
1406 }
1407 return (0);
1408 }
1409
1410 static int
1411 realtimer_settime(struct itimer *it, int flags,
1412 struct itimerspec *value, struct itimerspec *ovalue)
1413 {
1414 struct timespec cts, ts;
1415 struct timeval tv;
1416 struct itimerspec val;
1417
1418 mtx_assert(&it->it_mtx, MA_OWNED);
1419
1420 val = *value;
1421 if (itimespecfix(&val.it_value))
1422 return (EINVAL);
1423
1424 if (timespecisset(&val.it_value)) {
1425 if (itimespecfix(&val.it_interval))
1426 return (EINVAL);
1427 } else {
1428 timespecclear(&val.it_interval);
1429 }
1430
1431 if (ovalue != NULL)
1432 realtimer_gettime(it, ovalue);
1433
1434 it->it_time = val;
1435 if (timespecisset(&val.it_value)) {
1436 realtimer_clocktime(it->it_clockid, &cts);
1437 ts = val.it_value;
1438 if ((flags & TIMER_ABSTIME) == 0) {
1439 /* Convert to absolute time. */
1440 timespecadd(&it->it_time.it_value, &cts);
1441 } else {
1442 timespecsub(&ts, &cts);
1443 /*
1444 * We don't care if ts is negative, tztohz will
1445 * fix it.
1446 */
1447 }
1448 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1449 callout_reset(&it->it_callout, tvtohz(&tv),
1450 realtimer_expire, it);
1451 } else {
1452 callout_stop(&it->it_callout);
1453 }
1454
1455 return (0);
1456 }
1457
1458 static void
1459 realtimer_clocktime(clockid_t id, struct timespec *ts)
1460 {
1461 if (id == CLOCK_REALTIME)
1462 getnanotime(ts);
1463 else /* CLOCK_MONOTONIC */
1464 getnanouptime(ts);
1465 }
1466
1467 int
1468 itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi)
1469 {
1470 struct itimer *it;
1471
1472 PROC_LOCK_ASSERT(p, MA_OWNED);
1473 it = itimer_find(p, timerid);
1474 if (it != NULL) {
1475 ksi->ksi_overrun = it->it_overrun;
1476 it->it_overrun_last = it->it_overrun;
1477 it->it_overrun = 0;
1478 ITIMER_UNLOCK(it);
1479 return (0);
1480 }
1481 return (EINVAL);
1482 }
1483
1484 int
1485 itimespecfix(struct timespec *ts)
1486 {
1487
1488 if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
1489 return (EINVAL);
1490 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000)
1491 ts->tv_nsec = tick * 1000;
1492 return (0);
1493 }
1494
1495 /* Timeout callback for realtime timer */
1496 static void
1497 realtimer_expire(void *arg)
1498 {
1499 struct timespec cts, ts;
1500 struct timeval tv;
1501 struct itimer *it;
1502
1503 it = (struct itimer *)arg;
1504
1505 realtimer_clocktime(it->it_clockid, &cts);
1506 /* Only fire if time is reached. */
1507 if (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1508 if (timespecisset(&it->it_time.it_interval)) {
1509 timespecadd(&it->it_time.it_value,
1510 &it->it_time.it_interval);
1511 while (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1512 if (it->it_overrun < INT_MAX)
1513 it->it_overrun++;
1514 else
1515 it->it_ksi.ksi_errno = ERANGE;
1516 timespecadd(&it->it_time.it_value,
1517 &it->it_time.it_interval);
1518 }
1519 } else {
1520 /* single shot timer ? */
1521 timespecclear(&it->it_time.it_value);
1522 }
1523 if (timespecisset(&it->it_time.it_value)) {
1524 ts = it->it_time.it_value;
1525 timespecsub(&ts, &cts);
1526 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1527 callout_reset(&it->it_callout, tvtohz(&tv),
1528 realtimer_expire, it);
1529 }
1530 itimer_enter(it);
1531 ITIMER_UNLOCK(it);
1532 itimer_fire(it);
1533 ITIMER_LOCK(it);
1534 itimer_leave(it);
1535 } else if (timespecisset(&it->it_time.it_value)) {
1536 ts = it->it_time.it_value;
1537 timespecsub(&ts, &cts);
1538 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1539 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire,
1540 it);
1541 }
1542 }
1543
1544 void
1545 itimer_fire(struct itimer *it)
1546 {
1547 struct proc *p = it->it_proc;
1548 struct thread *td;
1549
1550 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1551 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1552 if (sigev_findtd(p, &it->it_sigev, &td) != 0) {
1553 ITIMER_LOCK(it);
1554 timespecclear(&it->it_time.it_value);
1555 timespecclear(&it->it_time.it_interval);
1556 callout_stop(&it->it_callout);
1557 ITIMER_UNLOCK(it);
1558 return;
1559 }
1560 if (!KSI_ONQ(&it->it_ksi)) {
1561 it->it_ksi.ksi_errno = 0;
1562 ksiginfo_set_sigev(&it->it_ksi, &it->it_sigev);
1563 tdsendsignal(p, td, it->it_ksi.ksi_signo, &it->it_ksi);
1564 } else {
1565 if (it->it_overrun < INT_MAX)
1566 it->it_overrun++;
1567 else
1568 it->it_ksi.ksi_errno = ERANGE;
1569 }
1570 PROC_UNLOCK(p);
1571 }
1572 }
1573
1574 static void
1575 itimers_alloc(struct proc *p)
1576 {
1577 struct itimers *its;
1578 int i;
1579
1580 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO);
1581 LIST_INIT(&its->its_virtual);
1582 LIST_INIT(&its->its_prof);
1583 TAILQ_INIT(&its->its_worklist);
1584 for (i = 0; i < TIMER_MAX; i++)
1585 its->its_timers[i] = NULL;
1586 PROC_LOCK(p);
1587 if (p->p_itimers == NULL) {
1588 p->p_itimers = its;
1589 PROC_UNLOCK(p);
1590 }
1591 else {
1592 PROC_UNLOCK(p);
1593 free(its, M_SUBPROC);
1594 }
1595 }
1596
1597 static void
1598 itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp __unused)
1599 {
1600 itimers_event_hook_exit(arg, p);
1601 }
1602
1603 /* Clean up timers when some process events are being triggered. */
1604 static void
1605 itimers_event_hook_exit(void *arg, struct proc *p)
1606 {
1607 struct itimers *its;
1608 struct itimer *it;
1609 int event = (int)(intptr_t)arg;
1610 int i;
1611
1612 if (p->p_itimers != NULL) {
1613 its = p->p_itimers;
1614 for (i = 0; i < MAX_CLOCKS; ++i) {
1615 if (posix_clocks[i].event_hook != NULL)
1616 CLOCK_CALL(i, event_hook, (p, i, event));
1617 }
1618 /*
1619 * According to susv3, XSI interval timers should be inherited
1620 * by new image.
1621 */
1622 if (event == ITIMER_EV_EXEC)
1623 i = 3;
1624 else if (event == ITIMER_EV_EXIT)
1625 i = 0;
1626 else
1627 panic("unhandled event");
1628 for (; i < TIMER_MAX; ++i) {
1629 if ((it = its->its_timers[i]) != NULL)
1630 kern_ktimer_delete(curthread, i);
1631 }
1632 if (its->its_timers[0] == NULL &&
1633 its->its_timers[1] == NULL &&
1634 its->its_timers[2] == NULL) {
1635 free(its, M_SUBPROC);
1636 p->p_itimers = NULL;
1637 }
1638 }
1639 }
Cache object: 9ba8f874e268ec6c6a7e15fa0976c93d
|