1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #include "opt_ktrace.h"
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/resourcevar.h>
43 #include <sys/signalvar.h>
44 #include <sys/kernel.h>
45 #include <sys/sleepqueue.h>
46 #include <sys/syscallsubr.h>
47 #include <sys/sysctl.h>
48 #include <sys/priv.h>
49 #include <sys/proc.h>
50 #include <sys/posix4.h>
51 #include <sys/time.h>
52 #include <sys/timers.h>
53 #include <sys/timetc.h>
54 #include <sys/vnode.h>
55 #ifdef KTRACE
56 #include <sys/ktrace.h>
57 #endif
58
59 #include <vm/vm.h>
60 #include <vm/vm_extern.h>
61 #include <vm/uma.h>
62
63 #define MAX_CLOCKS (CLOCK_MONOTONIC+1)
64 #define CPUCLOCK_BIT 0x80000000
65 #define CPUCLOCK_PROCESS_BIT 0x40000000
66 #define CPUCLOCK_ID_MASK (~(CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT))
67 #define MAKE_THREAD_CPUCLOCK(tid) (CPUCLOCK_BIT|(tid))
68 #define MAKE_PROCESS_CPUCLOCK(pid) \
69 (CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT|(pid))
70
71 #define NS_PER_SEC 1000000000
72
73 static struct kclock posix_clocks[MAX_CLOCKS];
74 static uma_zone_t itimer_zone = NULL;
75
76 /*
77 * Time of day and interval timer support.
78 *
79 * These routines provide the kernel entry points to get and set
80 * the time-of-day and per-process interval timers. Subroutines
81 * here provide support for adding and subtracting timeval structures
82 * and decrementing interval timers, optionally reloading the interval
83 * timers when they expire.
84 */
85
86 static int settime(struct thread *, struct timeval *);
87 static void timevalfix(struct timeval *);
88 static int user_clock_nanosleep(struct thread *td, clockid_t clock_id,
89 int flags, const struct timespec *ua_rqtp,
90 struct timespec *ua_rmtp);
91
92 static void itimer_start(void);
93 static int itimer_init(void *, int, int);
94 static void itimer_fini(void *, int);
95 static void itimer_enter(struct itimer *);
96 static void itimer_leave(struct itimer *);
97 static struct itimer *itimer_find(struct proc *, int);
98 static void itimers_alloc(struct proc *);
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 static void realtimer_expire_l(struct itimer *it, bool proc_locked);
107
108 static void realitexpire(void *arg);
109
110 static int register_posix_clock(int, const struct kclock *);
111 static void itimer_fire(struct itimer *it);
112 static int itimespecfix(struct timespec *ts);
113
114 #define CLOCK_CALL(clock, call, arglist) \
115 ((*posix_clocks[clock].call) arglist)
116
117 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL);
118
119 static int
settime(struct thread * td,struct timeval * tv)120 settime(struct thread *td, struct timeval *tv)
121 {
122 struct timeval delta, tv1, tv2;
123 static struct timeval maxtime, laststep;
124 struct timespec ts;
125
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 return (EPERM);
157 if (delta.tv_sec > 1) {
158 tv->tv_sec = tv1.tv_sec + 1;
159 printf("Time adjustment clamped to +1 second\n");
160 }
161 laststep = *tv;
162 }
163 }
164
165 ts.tv_sec = tv->tv_sec;
166 ts.tv_nsec = tv->tv_usec * 1000;
167 tc_setclock(&ts);
168 resettodr();
169 return (0);
170 }
171
172 #ifndef _SYS_SYSPROTO_H_
173 struct clock_getcpuclockid2_args {
174 id_t id;
175 int which,
176 clockid_t *clock_id;
177 };
178 #endif
179 /* ARGSUSED */
180 int
sys_clock_getcpuclockid2(struct thread * td,struct clock_getcpuclockid2_args * uap)181 sys_clock_getcpuclockid2(struct thread *td, struct clock_getcpuclockid2_args *uap)
182 {
183 clockid_t clk_id;
184 int error;
185
186 error = kern_clock_getcpuclockid2(td, uap->id, uap->which, &clk_id);
187 if (error == 0)
188 error = copyout(&clk_id, uap->clock_id, sizeof(clockid_t));
189 return (error);
190 }
191
192 int
kern_clock_getcpuclockid2(struct thread * td,id_t id,int which,clockid_t * clk_id)193 kern_clock_getcpuclockid2(struct thread *td, id_t id, int which,
194 clockid_t *clk_id)
195 {
196 struct proc *p;
197 pid_t pid;
198 lwpid_t tid;
199 int error;
200
201 switch (which) {
202 case CPUCLOCK_WHICH_PID:
203 if (id != 0) {
204 error = pget(id, PGET_CANSEE | PGET_NOTID, &p);
205 if (error != 0)
206 return (error);
207 PROC_UNLOCK(p);
208 pid = id;
209 } else {
210 pid = td->td_proc->p_pid;
211 }
212 *clk_id = MAKE_PROCESS_CPUCLOCK(pid);
213 return (0);
214 case CPUCLOCK_WHICH_TID:
215 tid = id == 0 ? td->td_tid : id;
216 *clk_id = MAKE_THREAD_CPUCLOCK(tid);
217 return (0);
218 default:
219 return (EINVAL);
220 }
221 }
222
223 #ifndef _SYS_SYSPROTO_H_
224 struct clock_gettime_args {
225 clockid_t clock_id;
226 struct timespec *tp;
227 };
228 #endif
229 /* ARGSUSED */
230 int
sys_clock_gettime(struct thread * td,struct clock_gettime_args * uap)231 sys_clock_gettime(struct thread *td, struct clock_gettime_args *uap)
232 {
233 struct timespec ats;
234 int error;
235
236 error = kern_clock_gettime(td, uap->clock_id, &ats);
237 if (error == 0)
238 error = copyout(&ats, uap->tp, sizeof(ats));
239
240 return (error);
241 }
242
243 static inline void
cputick2timespec(uint64_t runtime,struct timespec * ats)244 cputick2timespec(uint64_t runtime, struct timespec *ats)
245 {
246 uint64_t tr;
247 tr = cpu_tickrate();
248 ats->tv_sec = runtime / tr;
249 ats->tv_nsec = ((runtime % tr) * 1000000000ULL) / tr;
250 }
251
252 void
kern_thread_cputime(struct thread * targettd,struct timespec * ats)253 kern_thread_cputime(struct thread *targettd, struct timespec *ats)
254 {
255 uint64_t runtime, curtime, switchtime;
256
257 if (targettd == NULL) { /* current thread */
258 spinlock_enter();
259 switchtime = PCPU_GET(switchtime);
260 curtime = cpu_ticks();
261 runtime = curthread->td_runtime;
262 spinlock_exit();
263 runtime += curtime - switchtime;
264 } else {
265 PROC_LOCK_ASSERT(targettd->td_proc, MA_OWNED);
266 thread_lock(targettd);
267 runtime = targettd->td_runtime;
268 thread_unlock(targettd);
269 }
270 cputick2timespec(runtime, ats);
271 }
272
273 void
kern_process_cputime(struct proc * targetp,struct timespec * ats)274 kern_process_cputime(struct proc *targetp, struct timespec *ats)
275 {
276 uint64_t runtime;
277 struct rusage ru;
278
279 PROC_LOCK_ASSERT(targetp, MA_OWNED);
280 PROC_STATLOCK(targetp);
281 rufetch(targetp, &ru);
282 runtime = targetp->p_rux.rux_runtime;
283 if (curthread->td_proc == targetp)
284 runtime += cpu_ticks() - PCPU_GET(switchtime);
285 PROC_STATUNLOCK(targetp);
286 cputick2timespec(runtime, ats);
287 }
288
289 static int
get_cputime(struct thread * td,clockid_t clock_id,struct timespec * ats)290 get_cputime(struct thread *td, clockid_t clock_id, struct timespec *ats)
291 {
292 struct proc *p, *p2;
293 struct thread *td2;
294 lwpid_t tid;
295 pid_t pid;
296 int error;
297
298 p = td->td_proc;
299 if ((clock_id & CPUCLOCK_PROCESS_BIT) == 0) {
300 tid = clock_id & CPUCLOCK_ID_MASK;
301 td2 = tdfind(tid, p->p_pid);
302 if (td2 == NULL)
303 return (EINVAL);
304 kern_thread_cputime(td2, ats);
305 PROC_UNLOCK(td2->td_proc);
306 } else {
307 pid = clock_id & CPUCLOCK_ID_MASK;
308 error = pget(pid, PGET_CANSEE, &p2);
309 if (error != 0)
310 return (EINVAL);
311 kern_process_cputime(p2, ats);
312 PROC_UNLOCK(p2);
313 }
314 return (0);
315 }
316
317 int
kern_clock_gettime(struct thread * td,clockid_t clock_id,struct timespec * ats)318 kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
319 {
320 struct timeval sys, user;
321 struct proc *p;
322
323 p = td->td_proc;
324 switch (clock_id) {
325 case CLOCK_REALTIME: /* Default to precise. */
326 case CLOCK_REALTIME_PRECISE:
327 nanotime(ats);
328 break;
329 case CLOCK_REALTIME_FAST:
330 getnanotime(ats);
331 break;
332 case CLOCK_VIRTUAL:
333 PROC_LOCK(p);
334 PROC_STATLOCK(p);
335 calcru(p, &user, &sys);
336 PROC_STATUNLOCK(p);
337 PROC_UNLOCK(p);
338 TIMEVAL_TO_TIMESPEC(&user, ats);
339 break;
340 case CLOCK_PROF:
341 PROC_LOCK(p);
342 PROC_STATLOCK(p);
343 calcru(p, &user, &sys);
344 PROC_STATUNLOCK(p);
345 PROC_UNLOCK(p);
346 timevaladd(&user, &sys);
347 TIMEVAL_TO_TIMESPEC(&user, ats);
348 break;
349 case CLOCK_MONOTONIC: /* Default to precise. */
350 case CLOCK_MONOTONIC_PRECISE:
351 case CLOCK_UPTIME:
352 case CLOCK_UPTIME_PRECISE:
353 nanouptime(ats);
354 break;
355 case CLOCK_UPTIME_FAST:
356 case CLOCK_MONOTONIC_FAST:
357 getnanouptime(ats);
358 break;
359 case CLOCK_SECOND:
360 ats->tv_sec = time_second;
361 ats->tv_nsec = 0;
362 break;
363 case CLOCK_THREAD_CPUTIME_ID:
364 kern_thread_cputime(NULL, ats);
365 break;
366 case CLOCK_PROCESS_CPUTIME_ID:
367 PROC_LOCK(p);
368 kern_process_cputime(p, ats);
369 PROC_UNLOCK(p);
370 break;
371 default:
372 if ((int)clock_id >= 0)
373 return (EINVAL);
374 return (get_cputime(td, clock_id, ats));
375 }
376 return (0);
377 }
378
379 #ifndef _SYS_SYSPROTO_H_
380 struct clock_settime_args {
381 clockid_t clock_id;
382 const struct timespec *tp;
383 };
384 #endif
385 /* ARGSUSED */
386 int
sys_clock_settime(struct thread * td,struct clock_settime_args * uap)387 sys_clock_settime(struct thread *td, struct clock_settime_args *uap)
388 {
389 struct timespec ats;
390 int error;
391
392 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0)
393 return (error);
394 return (kern_clock_settime(td, uap->clock_id, &ats));
395 }
396
397 static int allow_insane_settime = 0;
398 SYSCTL_INT(_debug, OID_AUTO, allow_insane_settime, CTLFLAG_RWTUN,
399 &allow_insane_settime, 0,
400 "do not perform possibly restrictive checks on settime(2) args");
401
402 int
kern_clock_settime(struct thread * td,clockid_t clock_id,struct timespec * ats)403 kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats)
404 {
405 struct timeval atv;
406 int error;
407
408 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0)
409 return (error);
410 if (clock_id != CLOCK_REALTIME)
411 return (EINVAL);
412 if (!timespecvalid_interval(ats))
413 return (EINVAL);
414 if (!allow_insane_settime &&
415 (ats->tv_sec > 8000ULL * 365 * 24 * 60 * 60 ||
416 ats->tv_sec < utc_offset()))
417 return (EINVAL);
418 /* XXX Don't convert nsec->usec and back */
419 TIMESPEC_TO_TIMEVAL(&atv, ats);
420 error = settime(td, &atv);
421 return (error);
422 }
423
424 #ifndef _SYS_SYSPROTO_H_
425 struct clock_getres_args {
426 clockid_t clock_id;
427 struct timespec *tp;
428 };
429 #endif
430 int
sys_clock_getres(struct thread * td,struct clock_getres_args * uap)431 sys_clock_getres(struct thread *td, struct clock_getres_args *uap)
432 {
433 struct timespec ts;
434 int error;
435
436 if (uap->tp == NULL)
437 return (0);
438
439 error = kern_clock_getres(td, uap->clock_id, &ts);
440 if (error == 0)
441 error = copyout(&ts, uap->tp, sizeof(ts));
442 return (error);
443 }
444
445 int
kern_clock_getres(struct thread * td,clockid_t clock_id,struct timespec * ts)446 kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
447 {
448
449 ts->tv_sec = 0;
450 switch (clock_id) {
451 case CLOCK_REALTIME:
452 case CLOCK_REALTIME_FAST:
453 case CLOCK_REALTIME_PRECISE:
454 case CLOCK_MONOTONIC:
455 case CLOCK_MONOTONIC_FAST:
456 case CLOCK_MONOTONIC_PRECISE:
457 case CLOCK_UPTIME:
458 case CLOCK_UPTIME_FAST:
459 case CLOCK_UPTIME_PRECISE:
460 /*
461 * Round up the result of the division cheaply by adding 1.
462 * Rounding up is especially important if rounding down
463 * would give 0. Perfect rounding is unimportant.
464 */
465 ts->tv_nsec = NS_PER_SEC / tc_getfrequency() + 1;
466 break;
467 case CLOCK_VIRTUAL:
468 case CLOCK_PROF:
469 /* Accurately round up here because we can do so cheaply. */
470 ts->tv_nsec = howmany(NS_PER_SEC, hz);
471 break;
472 case CLOCK_SECOND:
473 ts->tv_sec = 1;
474 ts->tv_nsec = 0;
475 break;
476 case CLOCK_THREAD_CPUTIME_ID:
477 case CLOCK_PROCESS_CPUTIME_ID:
478 cputime:
479 ts->tv_nsec = 1000000000 / cpu_tickrate() + 1;
480 break;
481 default:
482 if ((int)clock_id < 0)
483 goto cputime;
484 return (EINVAL);
485 }
486 return (0);
487 }
488
489 int
kern_nanosleep(struct thread * td,struct timespec * rqt,struct timespec * rmt)490 kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt)
491 {
492
493 return (kern_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME, rqt,
494 rmt));
495 }
496
497 static uint8_t nanowait[MAXCPU];
498
499 int
kern_clock_nanosleep(struct thread * td,clockid_t clock_id,int flags,const struct timespec * rqt,struct timespec * rmt)500 kern_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags,
501 const struct timespec *rqt, struct timespec *rmt)
502 {
503 struct timespec ts, now;
504 sbintime_t sbt, sbtt, prec, tmp;
505 time_t over;
506 int error;
507 bool is_abs_real;
508
509 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= NS_PER_SEC)
510 return (EINVAL);
511 if ((flags & ~TIMER_ABSTIME) != 0)
512 return (EINVAL);
513 switch (clock_id) {
514 case CLOCK_REALTIME:
515 case CLOCK_REALTIME_PRECISE:
516 case CLOCK_REALTIME_FAST:
517 case CLOCK_SECOND:
518 is_abs_real = (flags & TIMER_ABSTIME) != 0;
519 break;
520 case CLOCK_MONOTONIC:
521 case CLOCK_MONOTONIC_PRECISE:
522 case CLOCK_MONOTONIC_FAST:
523 case CLOCK_UPTIME:
524 case CLOCK_UPTIME_PRECISE:
525 case CLOCK_UPTIME_FAST:
526 is_abs_real = false;
527 break;
528 case CLOCK_VIRTUAL:
529 case CLOCK_PROF:
530 case CLOCK_PROCESS_CPUTIME_ID:
531 return (ENOTSUP);
532 case CLOCK_THREAD_CPUTIME_ID:
533 default:
534 return (EINVAL);
535 }
536 do {
537 ts = *rqt;
538 if ((flags & TIMER_ABSTIME) != 0) {
539 if (is_abs_real)
540 td->td_rtcgen =
541 atomic_load_acq_int(&rtc_generation);
542 error = kern_clock_gettime(td, clock_id, &now);
543 KASSERT(error == 0, ("kern_clock_gettime: %d", error));
544 timespecsub(&ts, &now, &ts);
545 }
546 if (ts.tv_sec < 0 || (ts.tv_sec == 0 && ts.tv_nsec == 0)) {
547 error = EWOULDBLOCK;
548 break;
549 }
550 if (ts.tv_sec > INT32_MAX / 2) {
551 over = ts.tv_sec - INT32_MAX / 2;
552 ts.tv_sec -= over;
553 } else
554 over = 0;
555 tmp = tstosbt(ts);
556 prec = tmp;
557 prec >>= tc_precexp;
558 if (TIMESEL(&sbt, tmp))
559 sbt += tc_tick_sbt;
560 sbt += tmp;
561 error = tsleep_sbt(&nanowait[curcpu], PWAIT | PCATCH, "nanslp",
562 sbt, prec, C_ABSOLUTE);
563 } while (error == 0 && is_abs_real && td->td_rtcgen == 0);
564 td->td_rtcgen = 0;
565 if (error != EWOULDBLOCK) {
566 if (TIMESEL(&sbtt, tmp))
567 sbtt += tc_tick_sbt;
568 if (sbtt >= sbt)
569 return (0);
570 if (error == ERESTART)
571 error = EINTR;
572 if ((flags & TIMER_ABSTIME) == 0 && rmt != NULL) {
573 ts = sbttots(sbt - sbtt);
574 ts.tv_sec += over;
575 if (ts.tv_sec < 0)
576 timespecclear(&ts);
577 *rmt = ts;
578 }
579 return (error);
580 }
581 return (0);
582 }
583
584 #ifndef _SYS_SYSPROTO_H_
585 struct nanosleep_args {
586 struct timespec *rqtp;
587 struct timespec *rmtp;
588 };
589 #endif
590 /* ARGSUSED */
591 int
sys_nanosleep(struct thread * td,struct nanosleep_args * uap)592 sys_nanosleep(struct thread *td, struct nanosleep_args *uap)
593 {
594
595 return (user_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME,
596 uap->rqtp, uap->rmtp));
597 }
598
599 #ifndef _SYS_SYSPROTO_H_
600 struct clock_nanosleep_args {
601 clockid_t clock_id;
602 int flags;
603 struct timespec *rqtp;
604 struct timespec *rmtp;
605 };
606 #endif
607 /* ARGSUSED */
608 int
sys_clock_nanosleep(struct thread * td,struct clock_nanosleep_args * uap)609 sys_clock_nanosleep(struct thread *td, struct clock_nanosleep_args *uap)
610 {
611 int error;
612
613 error = user_clock_nanosleep(td, uap->clock_id, uap->flags, uap->rqtp,
614 uap->rmtp);
615 return (kern_posix_error(td, error));
616 }
617
618 static int
user_clock_nanosleep(struct thread * td,clockid_t clock_id,int flags,const struct timespec * ua_rqtp,struct timespec * ua_rmtp)619 user_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags,
620 const struct timespec *ua_rqtp, struct timespec *ua_rmtp)
621 {
622 struct timespec rmt, rqt;
623 int error, error2;
624
625 error = copyin(ua_rqtp, &rqt, sizeof(rqt));
626 if (error)
627 return (error);
628 error = kern_clock_nanosleep(td, clock_id, flags, &rqt, &rmt);
629 if (error == EINTR && ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0) {
630 error2 = copyout(&rmt, ua_rmtp, sizeof(rmt));
631 if (error2 != 0)
632 error = error2;
633 }
634 return (error);
635 }
636
637 #ifndef _SYS_SYSPROTO_H_
638 struct gettimeofday_args {
639 struct timeval *tp;
640 struct timezone *tzp;
641 };
642 #endif
643 /* ARGSUSED */
644 int
sys_gettimeofday(struct thread * td,struct gettimeofday_args * uap)645 sys_gettimeofday(struct thread *td, struct gettimeofday_args *uap)
646 {
647 struct timeval atv;
648 struct timezone rtz;
649 int error = 0;
650
651 if (uap->tp) {
652 microtime(&atv);
653 error = copyout(&atv, uap->tp, sizeof (atv));
654 }
655 if (error == 0 && uap->tzp != NULL) {
656 rtz.tz_minuteswest = 0;
657 rtz.tz_dsttime = 0;
658 error = copyout(&rtz, uap->tzp, sizeof (rtz));
659 }
660 return (error);
661 }
662
663 #ifndef _SYS_SYSPROTO_H_
664 struct settimeofday_args {
665 struct timeval *tv;
666 struct timezone *tzp;
667 };
668 #endif
669 /* ARGSUSED */
670 int
sys_settimeofday(struct thread * td,struct settimeofday_args * uap)671 sys_settimeofday(struct thread *td, struct settimeofday_args *uap)
672 {
673 struct timeval atv, *tvp;
674 struct timezone atz, *tzp;
675 int error;
676
677 if (uap->tv) {
678 error = copyin(uap->tv, &atv, sizeof(atv));
679 if (error)
680 return (error);
681 tvp = &atv;
682 } else
683 tvp = NULL;
684 if (uap->tzp) {
685 error = copyin(uap->tzp, &atz, sizeof(atz));
686 if (error)
687 return (error);
688 tzp = &atz;
689 } else
690 tzp = NULL;
691 return (kern_settimeofday(td, tvp, tzp));
692 }
693
694 int
kern_settimeofday(struct thread * td,struct timeval * tv,struct timezone * tzp)695 kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp)
696 {
697 int error;
698
699 error = priv_check(td, PRIV_SETTIMEOFDAY);
700 if (error)
701 return (error);
702 /* Verify all parameters before changing time. */
703 if (tv) {
704 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000 ||
705 tv->tv_sec < 0)
706 return (EINVAL);
707 error = settime(td, tv);
708 }
709 return (error);
710 }
711
712 /*
713 * Get value of an interval timer. The process virtual and profiling virtual
714 * time timers are kept in the p_stats area, since they can be swapped out.
715 * These are kept internally in the way they are specified externally: in
716 * time until they expire.
717 *
718 * The real time interval timer is kept in the process table slot for the
719 * process, and its value (it_value) is kept as an absolute time rather than
720 * as a delta, so that it is easy to keep periodic real-time signals from
721 * drifting.
722 *
723 * Virtual time timers are processed in the hardclock() routine of
724 * kern_clock.c. The real time timer is processed by a timeout routine,
725 * called from the softclock() routine. Since a callout may be delayed in
726 * real time due to interrupt processing in the system, it is possible for
727 * the real time timeout routine (realitexpire, given below), to be delayed
728 * in real time past when it is supposed to occur. It does not suffice,
729 * therefore, to reload the real timer .it_value from the real time timers
730 * .it_interval. Rather, we compute the next time in absolute time the timer
731 * should go off.
732 */
733 #ifndef _SYS_SYSPROTO_H_
734 struct getitimer_args {
735 u_int which;
736 struct itimerval *itv;
737 };
738 #endif
739 int
sys_getitimer(struct thread * td,struct getitimer_args * uap)740 sys_getitimer(struct thread *td, struct getitimer_args *uap)
741 {
742 struct itimerval aitv;
743 int error;
744
745 error = kern_getitimer(td, uap->which, &aitv);
746 if (error != 0)
747 return (error);
748 return (copyout(&aitv, uap->itv, sizeof (struct itimerval)));
749 }
750
751 int
kern_getitimer(struct thread * td,u_int which,struct itimerval * aitv)752 kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv)
753 {
754 struct proc *p = td->td_proc;
755 struct timeval ctv;
756
757 if (which > ITIMER_PROF)
758 return (EINVAL);
759
760 if (which == ITIMER_REAL) {
761 /*
762 * Convert from absolute to relative time in .it_value
763 * part of real time timer. If time for real time timer
764 * has passed return 0, else return difference between
765 * current time and time for the timer to go off.
766 */
767 PROC_LOCK(p);
768 *aitv = p->p_realtimer;
769 PROC_UNLOCK(p);
770 if (timevalisset(&aitv->it_value)) {
771 microuptime(&ctv);
772 if (timevalcmp(&aitv->it_value, &ctv, <))
773 timevalclear(&aitv->it_value);
774 else
775 timevalsub(&aitv->it_value, &ctv);
776 }
777 } else {
778 PROC_ITIMLOCK(p);
779 *aitv = p->p_stats->p_timer[which];
780 PROC_ITIMUNLOCK(p);
781 }
782 #ifdef KTRACE
783 if (KTRPOINT(td, KTR_STRUCT))
784 ktritimerval(aitv);
785 #endif
786 return (0);
787 }
788
789 #ifndef _SYS_SYSPROTO_H_
790 struct setitimer_args {
791 u_int which;
792 struct itimerval *itv, *oitv;
793 };
794 #endif
795 int
sys_setitimer(struct thread * td,struct setitimer_args * uap)796 sys_setitimer(struct thread *td, struct setitimer_args *uap)
797 {
798 struct itimerval aitv, oitv;
799 int error;
800
801 if (uap->itv == NULL) {
802 uap->itv = uap->oitv;
803 return (sys_getitimer(td, (struct getitimer_args *)uap));
804 }
805
806 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval))))
807 return (error);
808 error = kern_setitimer(td, uap->which, &aitv, &oitv);
809 if (error != 0 || uap->oitv == NULL)
810 return (error);
811 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval)));
812 }
813
814 int
kern_setitimer(struct thread * td,u_int which,struct itimerval * aitv,struct itimerval * oitv)815 kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv,
816 struct itimerval *oitv)
817 {
818 struct proc *p = td->td_proc;
819 struct timeval ctv;
820 sbintime_t sbt, pr;
821
822 if (aitv == NULL)
823 return (kern_getitimer(td, which, oitv));
824
825 if (which > ITIMER_PROF)
826 return (EINVAL);
827 #ifdef KTRACE
828 if (KTRPOINT(td, KTR_STRUCT))
829 ktritimerval(aitv);
830 #endif
831 if (itimerfix(&aitv->it_value) ||
832 aitv->it_value.tv_sec > INT32_MAX / 2)
833 return (EINVAL);
834 if (!timevalisset(&aitv->it_value))
835 timevalclear(&aitv->it_interval);
836 else if (itimerfix(&aitv->it_interval) ||
837 aitv->it_interval.tv_sec > INT32_MAX / 2)
838 return (EINVAL);
839
840 if (which == ITIMER_REAL) {
841 PROC_LOCK(p);
842 if (timevalisset(&p->p_realtimer.it_value))
843 callout_stop(&p->p_itcallout);
844 microuptime(&ctv);
845 if (timevalisset(&aitv->it_value)) {
846 pr = tvtosbt(aitv->it_value) >> tc_precexp;
847 timevaladd(&aitv->it_value, &ctv);
848 sbt = tvtosbt(aitv->it_value);
849 callout_reset_sbt(&p->p_itcallout, sbt, pr,
850 realitexpire, p, C_ABSOLUTE);
851 }
852 *oitv = p->p_realtimer;
853 p->p_realtimer = *aitv;
854 PROC_UNLOCK(p);
855 if (timevalisset(&oitv->it_value)) {
856 if (timevalcmp(&oitv->it_value, &ctv, <))
857 timevalclear(&oitv->it_value);
858 else
859 timevalsub(&oitv->it_value, &ctv);
860 }
861 } else {
862 if (aitv->it_interval.tv_sec == 0 &&
863 aitv->it_interval.tv_usec != 0 &&
864 aitv->it_interval.tv_usec < tick)
865 aitv->it_interval.tv_usec = tick;
866 if (aitv->it_value.tv_sec == 0 &&
867 aitv->it_value.tv_usec != 0 &&
868 aitv->it_value.tv_usec < tick)
869 aitv->it_value.tv_usec = tick;
870 PROC_ITIMLOCK(p);
871 *oitv = p->p_stats->p_timer[which];
872 p->p_stats->p_timer[which] = *aitv;
873 PROC_ITIMUNLOCK(p);
874 }
875 #ifdef KTRACE
876 if (KTRPOINT(td, KTR_STRUCT))
877 ktritimerval(oitv);
878 #endif
879 return (0);
880 }
881
882 static void
realitexpire_reset_callout(struct proc * p,sbintime_t * isbtp)883 realitexpire_reset_callout(struct proc *p, sbintime_t *isbtp)
884 {
885 sbintime_t prec;
886
887 prec = isbtp == NULL ? tvtosbt(p->p_realtimer.it_interval) : *isbtp;
888 callout_reset_sbt(&p->p_itcallout, tvtosbt(p->p_realtimer.it_value),
889 prec >> tc_precexp, realitexpire, p, C_ABSOLUTE);
890 }
891
892 void
itimer_proc_continue(struct proc * p)893 itimer_proc_continue(struct proc *p)
894 {
895 struct timeval ctv;
896 struct itimer *it;
897 int id;
898
899 PROC_LOCK_ASSERT(p, MA_OWNED);
900
901 if ((p->p_flag2 & P2_ITSTOPPED) != 0) {
902 p->p_flag2 &= ~P2_ITSTOPPED;
903 microuptime(&ctv);
904 if (timevalcmp(&p->p_realtimer.it_value, &ctv, >=))
905 realitexpire(p);
906 else
907 realitexpire_reset_callout(p, NULL);
908 }
909
910 if (p->p_itimers != NULL) {
911 for (id = 3; id < TIMER_MAX; id++) {
912 it = p->p_itimers->its_timers[id];
913 if (it == NULL)
914 continue;
915 if ((it->it_flags & ITF_PSTOPPED) != 0) {
916 ITIMER_LOCK(it);
917 if ((it->it_flags & ITF_PSTOPPED) != 0) {
918 it->it_flags &= ~ITF_PSTOPPED;
919 if ((it->it_flags & ITF_DELETING) == 0)
920 realtimer_expire_l(it, true);
921 }
922 ITIMER_UNLOCK(it);
923 }
924 }
925 }
926 }
927
928 /*
929 * Real interval timer expired:
930 * send process whose timer expired an alarm signal.
931 * If time is not set up to reload, then just return.
932 * Else compute next time timer should go off which is > current time.
933 * This is where delay in processing this timeout causes multiple
934 * SIGALRM calls to be compressed into one.
935 * tvtohz() always adds 1 to allow for the time until the next clock
936 * interrupt being strictly less than 1 clock tick, but we don't want
937 * that here since we want to appear to be in sync with the clock
938 * interrupt even when we're delayed.
939 */
940 static void
realitexpire(void * arg)941 realitexpire(void *arg)
942 {
943 struct proc *p;
944 struct timeval ctv;
945 sbintime_t isbt;
946
947 p = (struct proc *)arg;
948 kern_psignal(p, SIGALRM);
949 if (!timevalisset(&p->p_realtimer.it_interval)) {
950 timevalclear(&p->p_realtimer.it_value);
951 return;
952 }
953
954 isbt = tvtosbt(p->p_realtimer.it_interval);
955 if (isbt >= sbt_timethreshold)
956 getmicrouptime(&ctv);
957 else
958 microuptime(&ctv);
959 do {
960 timevaladd(&p->p_realtimer.it_value,
961 &p->p_realtimer.it_interval);
962 } while (timevalcmp(&p->p_realtimer.it_value, &ctv, <=));
963
964 if (P_SHOULDSTOP(p) || P_KILLED(p)) {
965 p->p_flag2 |= P2_ITSTOPPED;
966 return;
967 }
968
969 p->p_flag2 &= ~P2_ITSTOPPED;
970 realitexpire_reset_callout(p, &isbt);
971 }
972
973 /*
974 * Check that a proposed value to load into the .it_value or
975 * .it_interval part of an interval timer is acceptable, and
976 * fix it to have at least minimal value (i.e. if it is less
977 * than the resolution of the clock, round it up.)
978 */
979 int
itimerfix(struct timeval * tv)980 itimerfix(struct timeval *tv)
981 {
982
983 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000)
984 return (EINVAL);
985 if (tv->tv_sec == 0 && tv->tv_usec != 0 &&
986 tv->tv_usec < (u_int)tick / 16)
987 tv->tv_usec = (u_int)tick / 16;
988 return (0);
989 }
990
991 /*
992 * Decrement an interval timer by a specified number
993 * of microseconds, which must be less than a second,
994 * i.e. < 1000000. If the timer expires, then reload
995 * it. In this case, carry over (usec - old value) to
996 * reduce the value reloaded into the timer so that
997 * the timer does not drift. This routine assumes
998 * that it is called in a context where the timers
999 * on which it is operating cannot change in value.
1000 */
1001 int
itimerdecr(struct itimerval * itp,int usec)1002 itimerdecr(struct itimerval *itp, int usec)
1003 {
1004
1005 if (itp->it_value.tv_usec < usec) {
1006 if (itp->it_value.tv_sec == 0) {
1007 /* expired, and already in next interval */
1008 usec -= itp->it_value.tv_usec;
1009 goto expire;
1010 }
1011 itp->it_value.tv_usec += 1000000;
1012 itp->it_value.tv_sec--;
1013 }
1014 itp->it_value.tv_usec -= usec;
1015 usec = 0;
1016 if (timevalisset(&itp->it_value))
1017 return (1);
1018 /* expired, exactly at end of interval */
1019 expire:
1020 if (timevalisset(&itp->it_interval)) {
1021 itp->it_value = itp->it_interval;
1022 itp->it_value.tv_usec -= usec;
1023 if (itp->it_value.tv_usec < 0) {
1024 itp->it_value.tv_usec += 1000000;
1025 itp->it_value.tv_sec--;
1026 }
1027 } else
1028 itp->it_value.tv_usec = 0; /* sec is already 0 */
1029 return (0);
1030 }
1031
1032 /*
1033 * Add and subtract routines for timevals.
1034 * N.B.: subtract routine doesn't deal with
1035 * results which are before the beginning,
1036 * it just gets very confused in this case.
1037 * Caveat emptor.
1038 */
1039 void
timevaladd(struct timeval * t1,const struct timeval * t2)1040 timevaladd(struct timeval *t1, const struct timeval *t2)
1041 {
1042
1043 t1->tv_sec += t2->tv_sec;
1044 t1->tv_usec += t2->tv_usec;
1045 timevalfix(t1);
1046 }
1047
1048 void
timevalsub(struct timeval * t1,const struct timeval * t2)1049 timevalsub(struct timeval *t1, const struct timeval *t2)
1050 {
1051
1052 t1->tv_sec -= t2->tv_sec;
1053 t1->tv_usec -= t2->tv_usec;
1054 timevalfix(t1);
1055 }
1056
1057 static void
timevalfix(struct timeval * t1)1058 timevalfix(struct timeval *t1)
1059 {
1060
1061 if (t1->tv_usec < 0) {
1062 t1->tv_sec--;
1063 t1->tv_usec += 1000000;
1064 }
1065 if (t1->tv_usec >= 1000000) {
1066 t1->tv_sec++;
1067 t1->tv_usec -= 1000000;
1068 }
1069 }
1070
1071 /*
1072 * ratecheck(): simple time-based rate-limit checking.
1073 */
1074 int
ratecheck(struct timeval * lasttime,const struct timeval * mininterval)1075 ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
1076 {
1077 struct timeval tv, delta;
1078 int rv = 0;
1079
1080 getmicrouptime(&tv); /* NB: 10ms precision */
1081 delta = tv;
1082 timevalsub(&delta, lasttime);
1083
1084 /*
1085 * check for 0,0 is so that the message will be seen at least once,
1086 * even if interval is huge.
1087 */
1088 if (timevalcmp(&delta, mininterval, >=) ||
1089 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
1090 *lasttime = tv;
1091 rv = 1;
1092 }
1093
1094 return (rv);
1095 }
1096
1097 /*
1098 * eventratecheck(): events per second limitation.
1099 *
1100 * Return 0 if the limit is to be enforced (e.g. the caller
1101 * should ignore the event because of the rate limitation).
1102 *
1103 * maxeps of 0 always causes zero to be returned. maxeps of -1
1104 * always causes 1 to be returned; this effectively defeats rate
1105 * limiting.
1106 *
1107 * Note that we maintain the struct timeval for compatibility
1108 * with other bsd systems. We reuse the storage and just monitor
1109 * clock ticks for minimal overhead.
1110 */
1111 int
eventratecheck(struct timeval * lasttime,int * cureps,int maxeps)1112 eventratecheck(struct timeval *lasttime, int *cureps, int maxeps)
1113 {
1114 int now;
1115
1116 /*
1117 * Reset the last time and counter if this is the first call
1118 * or more than a second has passed since the last update of
1119 * lasttime.
1120 */
1121 now = ticks;
1122 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) {
1123 lasttime->tv_sec = now;
1124 *cureps = 1;
1125 return (maxeps != 0);
1126 } else {
1127 (*cureps)++; /* NB: ignore potential overflow */
1128 return (maxeps < 0 || *cureps <= maxeps);
1129 }
1130 }
1131
1132 static void
itimer_start(void)1133 itimer_start(void)
1134 {
1135 static const struct kclock rt_clock = {
1136 .timer_create = realtimer_create,
1137 .timer_delete = realtimer_delete,
1138 .timer_settime = realtimer_settime,
1139 .timer_gettime = realtimer_gettime,
1140 };
1141
1142 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer),
1143 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0);
1144 register_posix_clock(CLOCK_REALTIME, &rt_clock);
1145 register_posix_clock(CLOCK_MONOTONIC, &rt_clock);
1146 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L);
1147 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX);
1148 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX);
1149 }
1150
1151 static int
register_posix_clock(int clockid,const struct kclock * clk)1152 register_posix_clock(int clockid, const struct kclock *clk)
1153 {
1154 if ((unsigned)clockid >= MAX_CLOCKS) {
1155 printf("%s: invalid clockid\n", __func__);
1156 return (0);
1157 }
1158 posix_clocks[clockid] = *clk;
1159 return (1);
1160 }
1161
1162 static int
itimer_init(void * mem,int size,int flags)1163 itimer_init(void *mem, int size, int flags)
1164 {
1165 struct itimer *it;
1166
1167 it = (struct itimer *)mem;
1168 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF);
1169 return (0);
1170 }
1171
1172 static void
itimer_fini(void * mem,int size)1173 itimer_fini(void *mem, int size)
1174 {
1175 struct itimer *it;
1176
1177 it = (struct itimer *)mem;
1178 mtx_destroy(&it->it_mtx);
1179 }
1180
1181 static void
itimer_enter(struct itimer * it)1182 itimer_enter(struct itimer *it)
1183 {
1184
1185 mtx_assert(&it->it_mtx, MA_OWNED);
1186 it->it_usecount++;
1187 }
1188
1189 static void
itimer_leave(struct itimer * it)1190 itimer_leave(struct itimer *it)
1191 {
1192
1193 mtx_assert(&it->it_mtx, MA_OWNED);
1194 KASSERT(it->it_usecount > 0, ("invalid it_usecount"));
1195
1196 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0)
1197 wakeup(it);
1198 }
1199
1200 #ifndef _SYS_SYSPROTO_H_
1201 struct ktimer_create_args {
1202 clockid_t clock_id;
1203 struct sigevent * evp;
1204 int * timerid;
1205 };
1206 #endif
1207 int
sys_ktimer_create(struct thread * td,struct ktimer_create_args * uap)1208 sys_ktimer_create(struct thread *td, struct ktimer_create_args *uap)
1209 {
1210 struct sigevent *evp, ev;
1211 int id;
1212 int error;
1213
1214 if (uap->evp == NULL) {
1215 evp = NULL;
1216 } else {
1217 error = copyin(uap->evp, &ev, sizeof(ev));
1218 if (error != 0)
1219 return (error);
1220 evp = &ev;
1221 }
1222 error = kern_ktimer_create(td, uap->clock_id, evp, &id, -1);
1223 if (error == 0) {
1224 error = copyout(&id, uap->timerid, sizeof(int));
1225 if (error != 0)
1226 kern_ktimer_delete(td, id);
1227 }
1228 return (error);
1229 }
1230
1231 int
kern_ktimer_create(struct thread * td,clockid_t clock_id,struct sigevent * evp,int * timerid,int preset_id)1232 kern_ktimer_create(struct thread *td, clockid_t clock_id, struct sigevent *evp,
1233 int *timerid, int preset_id)
1234 {
1235 struct proc *p = td->td_proc;
1236 struct itimer *it;
1237 int id;
1238 int error;
1239
1240 if (clock_id < 0 || clock_id >= MAX_CLOCKS)
1241 return (EINVAL);
1242
1243 if (posix_clocks[clock_id].timer_create == NULL)
1244 return (EINVAL);
1245
1246 if (evp != NULL) {
1247 if (evp->sigev_notify != SIGEV_NONE &&
1248 evp->sigev_notify != SIGEV_SIGNAL &&
1249 evp->sigev_notify != SIGEV_THREAD_ID)
1250 return (EINVAL);
1251 if ((evp->sigev_notify == SIGEV_SIGNAL ||
1252 evp->sigev_notify == SIGEV_THREAD_ID) &&
1253 !_SIG_VALID(evp->sigev_signo))
1254 return (EINVAL);
1255 }
1256
1257 if (p->p_itimers == NULL)
1258 itimers_alloc(p);
1259
1260 it = uma_zalloc(itimer_zone, M_WAITOK);
1261 it->it_flags = 0;
1262 it->it_usecount = 0;
1263 timespecclear(&it->it_time.it_value);
1264 timespecclear(&it->it_time.it_interval);
1265 it->it_overrun = 0;
1266 it->it_overrun_last = 0;
1267 it->it_clockid = clock_id;
1268 it->it_proc = p;
1269 ksiginfo_init(&it->it_ksi);
1270 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT;
1271 error = CLOCK_CALL(clock_id, timer_create, (it));
1272 if (error != 0)
1273 goto out;
1274
1275 PROC_LOCK(p);
1276 if (preset_id != -1) {
1277 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id"));
1278 id = preset_id;
1279 if (p->p_itimers->its_timers[id] != NULL) {
1280 PROC_UNLOCK(p);
1281 error = 0;
1282 goto out;
1283 }
1284 } else {
1285 /*
1286 * Find a free timer slot, skipping those reserved
1287 * for setitimer().
1288 */
1289 for (id = 3; id < TIMER_MAX; id++)
1290 if (p->p_itimers->its_timers[id] == NULL)
1291 break;
1292 if (id == TIMER_MAX) {
1293 PROC_UNLOCK(p);
1294 error = EAGAIN;
1295 goto out;
1296 }
1297 }
1298 p->p_itimers->its_timers[id] = it;
1299 if (evp != NULL)
1300 it->it_sigev = *evp;
1301 else {
1302 it->it_sigev.sigev_notify = SIGEV_SIGNAL;
1303 switch (clock_id) {
1304 default:
1305 case CLOCK_REALTIME:
1306 it->it_sigev.sigev_signo = SIGALRM;
1307 break;
1308 case CLOCK_VIRTUAL:
1309 it->it_sigev.sigev_signo = SIGVTALRM;
1310 break;
1311 case CLOCK_PROF:
1312 it->it_sigev.sigev_signo = SIGPROF;
1313 break;
1314 }
1315 it->it_sigev.sigev_value.sival_int = id;
1316 }
1317
1318 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1319 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1320 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo;
1321 it->it_ksi.ksi_code = SI_TIMER;
1322 it->it_ksi.ksi_value = it->it_sigev.sigev_value;
1323 it->it_ksi.ksi_timerid = id;
1324 }
1325 PROC_UNLOCK(p);
1326 *timerid = id;
1327 return (0);
1328
1329 out:
1330 ITIMER_LOCK(it);
1331 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1332 ITIMER_UNLOCK(it);
1333 uma_zfree(itimer_zone, it);
1334 return (error);
1335 }
1336
1337 #ifndef _SYS_SYSPROTO_H_
1338 struct ktimer_delete_args {
1339 int timerid;
1340 };
1341 #endif
1342 int
sys_ktimer_delete(struct thread * td,struct ktimer_delete_args * uap)1343 sys_ktimer_delete(struct thread *td, struct ktimer_delete_args *uap)
1344 {
1345
1346 return (kern_ktimer_delete(td, uap->timerid));
1347 }
1348
1349 static struct itimer *
itimer_find(struct proc * p,int timerid)1350 itimer_find(struct proc *p, int timerid)
1351 {
1352 struct itimer *it;
1353
1354 PROC_LOCK_ASSERT(p, MA_OWNED);
1355 if ((p->p_itimers == NULL) ||
1356 (timerid < 0) || (timerid >= TIMER_MAX) ||
1357 (it = p->p_itimers->its_timers[timerid]) == NULL) {
1358 return (NULL);
1359 }
1360 ITIMER_LOCK(it);
1361 if ((it->it_flags & ITF_DELETING) != 0) {
1362 ITIMER_UNLOCK(it);
1363 it = NULL;
1364 }
1365 return (it);
1366 }
1367
1368 int
kern_ktimer_delete(struct thread * td,int timerid)1369 kern_ktimer_delete(struct thread *td, int timerid)
1370 {
1371 struct proc *p = td->td_proc;
1372 struct itimer *it;
1373
1374 PROC_LOCK(p);
1375 it = itimer_find(p, timerid);
1376 if (it == NULL) {
1377 PROC_UNLOCK(p);
1378 return (EINVAL);
1379 }
1380 PROC_UNLOCK(p);
1381
1382 it->it_flags |= ITF_DELETING;
1383 while (it->it_usecount > 0) {
1384 it->it_flags |= ITF_WANTED;
1385 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0);
1386 }
1387 it->it_flags &= ~ITF_WANTED;
1388 CLOCK_CALL(it->it_clockid, timer_delete, (it));
1389 ITIMER_UNLOCK(it);
1390
1391 PROC_LOCK(p);
1392 if (KSI_ONQ(&it->it_ksi))
1393 sigqueue_take(&it->it_ksi);
1394 p->p_itimers->its_timers[timerid] = NULL;
1395 PROC_UNLOCK(p);
1396 uma_zfree(itimer_zone, it);
1397 return (0);
1398 }
1399
1400 #ifndef _SYS_SYSPROTO_H_
1401 struct ktimer_settime_args {
1402 int timerid;
1403 int flags;
1404 const struct itimerspec * value;
1405 struct itimerspec * ovalue;
1406 };
1407 #endif
1408 int
sys_ktimer_settime(struct thread * td,struct ktimer_settime_args * uap)1409 sys_ktimer_settime(struct thread *td, struct ktimer_settime_args *uap)
1410 {
1411 struct itimerspec val, oval, *ovalp;
1412 int error;
1413
1414 error = copyin(uap->value, &val, sizeof(val));
1415 if (error != 0)
1416 return (error);
1417 ovalp = uap->ovalue != NULL ? &oval : NULL;
1418 error = kern_ktimer_settime(td, uap->timerid, uap->flags, &val, ovalp);
1419 if (error == 0 && uap->ovalue != NULL)
1420 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp));
1421 return (error);
1422 }
1423
1424 int
kern_ktimer_settime(struct thread * td,int timer_id,int flags,struct itimerspec * val,struct itimerspec * oval)1425 kern_ktimer_settime(struct thread *td, int timer_id, int flags,
1426 struct itimerspec *val, struct itimerspec *oval)
1427 {
1428 struct proc *p;
1429 struct itimer *it;
1430 int error;
1431
1432 p = td->td_proc;
1433 PROC_LOCK(p);
1434 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1435 PROC_UNLOCK(p);
1436 error = EINVAL;
1437 } else {
1438 PROC_UNLOCK(p);
1439 itimer_enter(it);
1440 error = CLOCK_CALL(it->it_clockid, timer_settime, (it,
1441 flags, val, oval));
1442 itimer_leave(it);
1443 ITIMER_UNLOCK(it);
1444 }
1445 return (error);
1446 }
1447
1448 #ifndef _SYS_SYSPROTO_H_
1449 struct ktimer_gettime_args {
1450 int timerid;
1451 struct itimerspec * value;
1452 };
1453 #endif
1454 int
sys_ktimer_gettime(struct thread * td,struct ktimer_gettime_args * uap)1455 sys_ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap)
1456 {
1457 struct itimerspec val;
1458 int error;
1459
1460 error = kern_ktimer_gettime(td, uap->timerid, &val);
1461 if (error == 0)
1462 error = copyout(&val, uap->value, sizeof(val));
1463 return (error);
1464 }
1465
1466 int
kern_ktimer_gettime(struct thread * td,int timer_id,struct itimerspec * val)1467 kern_ktimer_gettime(struct thread *td, int timer_id, struct itimerspec *val)
1468 {
1469 struct proc *p;
1470 struct itimer *it;
1471 int error;
1472
1473 p = td->td_proc;
1474 PROC_LOCK(p);
1475 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) {
1476 PROC_UNLOCK(p);
1477 error = EINVAL;
1478 } else {
1479 PROC_UNLOCK(p);
1480 itimer_enter(it);
1481 error = CLOCK_CALL(it->it_clockid, timer_gettime, (it, val));
1482 itimer_leave(it);
1483 ITIMER_UNLOCK(it);
1484 }
1485 return (error);
1486 }
1487
1488 #ifndef _SYS_SYSPROTO_H_
1489 struct timer_getoverrun_args {
1490 int timerid;
1491 };
1492 #endif
1493 int
sys_ktimer_getoverrun(struct thread * td,struct ktimer_getoverrun_args * uap)1494 sys_ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap)
1495 {
1496
1497 return (kern_ktimer_getoverrun(td, uap->timerid));
1498 }
1499
1500 int
kern_ktimer_getoverrun(struct thread * td,int timer_id)1501 kern_ktimer_getoverrun(struct thread *td, int timer_id)
1502 {
1503 struct proc *p = td->td_proc;
1504 struct itimer *it;
1505 int error ;
1506
1507 PROC_LOCK(p);
1508 if (timer_id < 3 ||
1509 (it = itimer_find(p, timer_id)) == NULL) {
1510 PROC_UNLOCK(p);
1511 error = EINVAL;
1512 } else {
1513 td->td_retval[0] = it->it_overrun_last;
1514 ITIMER_UNLOCK(it);
1515 PROC_UNLOCK(p);
1516 error = 0;
1517 }
1518 return (error);
1519 }
1520
1521 static int
realtimer_create(struct itimer * it)1522 realtimer_create(struct itimer *it)
1523 {
1524 callout_init_mtx(&it->it_callout, &it->it_mtx, 0);
1525 return (0);
1526 }
1527
1528 static int
realtimer_delete(struct itimer * it)1529 realtimer_delete(struct itimer *it)
1530 {
1531 mtx_assert(&it->it_mtx, MA_OWNED);
1532
1533 /*
1534 * clear timer's value and interval to tell realtimer_expire
1535 * to not rearm the timer.
1536 */
1537 timespecclear(&it->it_time.it_value);
1538 timespecclear(&it->it_time.it_interval);
1539 ITIMER_UNLOCK(it);
1540 callout_drain(&it->it_callout);
1541 ITIMER_LOCK(it);
1542 return (0);
1543 }
1544
1545 static int
realtimer_gettime(struct itimer * it,struct itimerspec * ovalue)1546 realtimer_gettime(struct itimer *it, struct itimerspec *ovalue)
1547 {
1548 struct timespec cts;
1549
1550 mtx_assert(&it->it_mtx, MA_OWNED);
1551
1552 realtimer_clocktime(it->it_clockid, &cts);
1553 *ovalue = it->it_time;
1554 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) {
1555 timespecsub(&ovalue->it_value, &cts, &ovalue->it_value);
1556 if (ovalue->it_value.tv_sec < 0 ||
1557 (ovalue->it_value.tv_sec == 0 &&
1558 ovalue->it_value.tv_nsec == 0)) {
1559 ovalue->it_value.tv_sec = 0;
1560 ovalue->it_value.tv_nsec = 1;
1561 }
1562 }
1563 return (0);
1564 }
1565
1566 static int
realtimer_settime(struct itimer * it,int flags,struct itimerspec * value,struct itimerspec * ovalue)1567 realtimer_settime(struct itimer *it, int flags, struct itimerspec *value,
1568 struct itimerspec *ovalue)
1569 {
1570 struct timespec cts, ts;
1571 struct timeval tv;
1572 struct itimerspec val;
1573
1574 mtx_assert(&it->it_mtx, MA_OWNED);
1575
1576 val = *value;
1577 if (itimespecfix(&val.it_value))
1578 return (EINVAL);
1579
1580 if (timespecisset(&val.it_value)) {
1581 if (itimespecfix(&val.it_interval))
1582 return (EINVAL);
1583 } else {
1584 timespecclear(&val.it_interval);
1585 }
1586
1587 if (ovalue != NULL)
1588 realtimer_gettime(it, ovalue);
1589
1590 it->it_time = val;
1591 if (timespecisset(&val.it_value)) {
1592 realtimer_clocktime(it->it_clockid, &cts);
1593 ts = val.it_value;
1594 if ((flags & TIMER_ABSTIME) == 0) {
1595 /* Convert to absolute time. */
1596 timespecadd(&it->it_time.it_value, &cts,
1597 &it->it_time.it_value);
1598 } else {
1599 timespecsub(&ts, &cts, &ts);
1600 /*
1601 * We don't care if ts is negative, tztohz will
1602 * fix it.
1603 */
1604 }
1605 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1606 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire,
1607 it);
1608 } else {
1609 callout_stop(&it->it_callout);
1610 }
1611
1612 return (0);
1613 }
1614
1615 static void
realtimer_clocktime(clockid_t id,struct timespec * ts)1616 realtimer_clocktime(clockid_t id, struct timespec *ts)
1617 {
1618 if (id == CLOCK_REALTIME)
1619 getnanotime(ts);
1620 else /* CLOCK_MONOTONIC */
1621 getnanouptime(ts);
1622 }
1623
1624 int
itimer_accept(struct proc * p,int timerid,ksiginfo_t * ksi)1625 itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi)
1626 {
1627 struct itimer *it;
1628
1629 PROC_LOCK_ASSERT(p, MA_OWNED);
1630 it = itimer_find(p, timerid);
1631 if (it != NULL) {
1632 ksi->ksi_overrun = it->it_overrun;
1633 it->it_overrun_last = it->it_overrun;
1634 it->it_overrun = 0;
1635 ITIMER_UNLOCK(it);
1636 return (0);
1637 }
1638 return (EINVAL);
1639 }
1640
1641 static int
itimespecfix(struct timespec * ts)1642 itimespecfix(struct timespec *ts)
1643 {
1644
1645 if (!timespecvalid_interval(ts))
1646 return (EINVAL);
1647 if ((UINT64_MAX - ts->tv_nsec) / NS_PER_SEC < ts->tv_sec)
1648 return (EINVAL);
1649 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000)
1650 ts->tv_nsec = tick * 1000;
1651 return (0);
1652 }
1653
1654 #define timespectons(tsp) \
1655 ((uint64_t)(tsp)->tv_sec * NS_PER_SEC + (tsp)->tv_nsec)
1656 #define timespecfromns(ns) (struct timespec){ \
1657 .tv_sec = (ns) / NS_PER_SEC, \
1658 .tv_nsec = (ns) % NS_PER_SEC \
1659 }
1660
1661 static void
realtimer_expire_l(struct itimer * it,bool proc_locked)1662 realtimer_expire_l(struct itimer *it, bool proc_locked)
1663 {
1664 struct timespec cts, ts;
1665 struct timeval tv;
1666 struct proc *p;
1667 uint64_t interval, now, overruns, value;
1668
1669 realtimer_clocktime(it->it_clockid, &cts);
1670 /* Only fire if time is reached. */
1671 if (timespeccmp(&cts, &it->it_time.it_value, >=)) {
1672 if (timespecisset(&it->it_time.it_interval)) {
1673 timespecadd(&it->it_time.it_value,
1674 &it->it_time.it_interval,
1675 &it->it_time.it_value);
1676
1677 interval = timespectons(&it->it_time.it_interval);
1678 value = timespectons(&it->it_time.it_value);
1679 now = timespectons(&cts);
1680
1681 if (now >= value) {
1682 /*
1683 * We missed at least one period.
1684 */
1685 overruns = howmany(now - value + 1, interval);
1686 if (it->it_overrun + overruns >=
1687 it->it_overrun &&
1688 it->it_overrun + overruns <= INT_MAX) {
1689 it->it_overrun += (int)overruns;
1690 } else {
1691 it->it_overrun = INT_MAX;
1692 it->it_ksi.ksi_errno = ERANGE;
1693 }
1694 value =
1695 now + interval - (now - value) % interval;
1696 it->it_time.it_value = timespecfromns(value);
1697 }
1698 } else {
1699 /* single shot timer ? */
1700 timespecclear(&it->it_time.it_value);
1701 }
1702
1703 p = it->it_proc;
1704 if (timespecisset(&it->it_time.it_value)) {
1705 if (P_SHOULDSTOP(p) || P_KILLED(p)) {
1706 it->it_flags |= ITF_PSTOPPED;
1707 } else {
1708 timespecsub(&it->it_time.it_value, &cts, &ts);
1709 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1710 callout_reset(&it->it_callout, tvtohz(&tv),
1711 realtimer_expire, it);
1712 }
1713 }
1714
1715 itimer_enter(it);
1716 ITIMER_UNLOCK(it);
1717 if (proc_locked)
1718 PROC_UNLOCK(p);
1719 itimer_fire(it);
1720 if (proc_locked)
1721 PROC_LOCK(p);
1722 ITIMER_LOCK(it);
1723 itimer_leave(it);
1724 } else if (timespecisset(&it->it_time.it_value)) {
1725 p = it->it_proc;
1726 if (P_SHOULDSTOP(p) || P_KILLED(p)) {
1727 it->it_flags |= ITF_PSTOPPED;
1728 } else {
1729 ts = it->it_time.it_value;
1730 timespecsub(&ts, &cts, &ts);
1731 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1732 callout_reset(&it->it_callout, tvtohz(&tv),
1733 realtimer_expire, it);
1734 }
1735 }
1736 }
1737
1738 /* Timeout callback for realtime timer */
1739 static void
realtimer_expire(void * arg)1740 realtimer_expire(void *arg)
1741 {
1742 realtimer_expire_l(arg, false);
1743 }
1744
1745 static void
itimer_fire(struct itimer * it)1746 itimer_fire(struct itimer *it)
1747 {
1748 struct proc *p = it->it_proc;
1749 struct thread *td;
1750
1751 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL ||
1752 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) {
1753 if (sigev_findtd(p, &it->it_sigev, &td) != 0) {
1754 ITIMER_LOCK(it);
1755 timespecclear(&it->it_time.it_value);
1756 timespecclear(&it->it_time.it_interval);
1757 callout_stop(&it->it_callout);
1758 ITIMER_UNLOCK(it);
1759 return;
1760 }
1761 if (!KSI_ONQ(&it->it_ksi)) {
1762 it->it_ksi.ksi_errno = 0;
1763 ksiginfo_set_sigev(&it->it_ksi, &it->it_sigev);
1764 tdsendsignal(p, td, it->it_ksi.ksi_signo, &it->it_ksi);
1765 } else {
1766 if (it->it_overrun < INT_MAX)
1767 it->it_overrun++;
1768 else
1769 it->it_ksi.ksi_errno = ERANGE;
1770 }
1771 PROC_UNLOCK(p);
1772 }
1773 }
1774
1775 static void
itimers_alloc(struct proc * p)1776 itimers_alloc(struct proc *p)
1777 {
1778 struct itimers *its;
1779
1780 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO);
1781 PROC_LOCK(p);
1782 if (p->p_itimers == NULL) {
1783 p->p_itimers = its;
1784 PROC_UNLOCK(p);
1785 }
1786 else {
1787 PROC_UNLOCK(p);
1788 free(its, M_SUBPROC);
1789 }
1790 }
1791
1792 /* Clean up timers when some process events are being triggered. */
1793 static void
itimers_event_exit_exec(int start_idx,struct proc * p)1794 itimers_event_exit_exec(int start_idx, struct proc *p)
1795 {
1796 struct itimers *its;
1797 struct itimer *it;
1798 int i;
1799
1800 its = p->p_itimers;
1801 if (its == NULL)
1802 return;
1803
1804 for (i = start_idx; i < TIMER_MAX; ++i) {
1805 if ((it = its->its_timers[i]) != NULL)
1806 kern_ktimer_delete(curthread, i);
1807 }
1808 if (its->its_timers[0] == NULL && its->its_timers[1] == NULL &&
1809 its->its_timers[2] == NULL) {
1810 /* Synchronize with itimer_proc_continue(). */
1811 PROC_LOCK(p);
1812 p->p_itimers = NULL;
1813 PROC_UNLOCK(p);
1814 free(its, M_SUBPROC);
1815 }
1816 }
1817
1818 void
itimers_exec(struct proc * p)1819 itimers_exec(struct proc *p)
1820 {
1821 /*
1822 * According to susv3, XSI interval timers should be inherited
1823 * by new image.
1824 */
1825 itimers_event_exit_exec(3, p);
1826 }
1827
1828 void
itimers_exit(struct proc * p)1829 itimers_exit(struct proc *p)
1830 {
1831 itimers_event_exit_exec(0, p);
1832 }
1833