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: stable/11/sys/kern/kern_time.c 360225 2020-04-23 17:46:29Z brooks $"); 34 35#include "opt_ktrace.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/limits.h> 40#include <sys/clock.h> 41#include <sys/lock.h> 42#include <sys/mutex.h> 43#include <sys/sysproto.h> 44#include <sys/eventhandler.h> 45#include <sys/resourcevar.h> 46#include <sys/signalvar.h> 47#include <sys/kernel.h> 48#include <sys/sleepqueue.h> 49#include <sys/syscallsubr.h> 50#include <sys/sysctl.h> 51#include <sys/sysent.h> 52#include <sys/priv.h> 53#include <sys/proc.h> 54#include <sys/posix4.h> 55#include <sys/time.h> 56#include <sys/timers.h> 57#include <sys/timetc.h> 58#include <sys/vnode.h> 59#ifdef KTRACE 60#include <sys/ktrace.h> 61#endif 62 63#include <vm/vm.h> 64#include <vm/vm_extern.h> 65 66#define MAX_CLOCKS (CLOCK_MONOTONIC+1) 67#define CPUCLOCK_BIT 0x80000000 68#define CPUCLOCK_PROCESS_BIT 0x40000000 69#define CPUCLOCK_ID_MASK (~(CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT)) 70#define MAKE_THREAD_CPUCLOCK(tid) (CPUCLOCK_BIT|(tid)) 71#define MAKE_PROCESS_CPUCLOCK(pid) \ 72 (CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT|(pid)) 73 74static struct kclock posix_clocks[MAX_CLOCKS]; 75static uma_zone_t itimer_zone = NULL; 76 77/* 78 * Time of day and interval timer support. 79 * 80 * These routines provide the kernel entry points to get and set 81 * the time-of-day and per-process interval timers. Subroutines 82 * here provide support for adding and subtracting timeval structures 83 * and decrementing interval timers, optionally reloading the interval 84 * timers when they expire. 85 */ 86 87static int settime(struct thread *, struct timeval *); 88static void timevalfix(struct timeval *); 89static int user_clock_nanosleep(struct thread *td, clockid_t clock_id, 90 int flags, const struct timespec *ua_rqtp, 91 struct timespec *ua_rmtp); 92 93static void itimer_start(void); 94static int itimer_init(void *, int, int); 95static void itimer_fini(void *, int); 96static void itimer_enter(struct itimer *); 97static void itimer_leave(struct itimer *); 98static struct itimer *itimer_find(struct proc *, int); 99static void itimers_alloc(struct proc *); 100static void itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp); 101static void itimers_event_hook_exit(void *arg, struct proc *p); 102static int realtimer_create(struct itimer *); 103static int realtimer_gettime(struct itimer *, struct itimerspec *); 104static int realtimer_settime(struct itimer *, int, 105 struct itimerspec *, struct itimerspec *); 106static int realtimer_delete(struct itimer *); 107static void realtimer_clocktime(clockid_t, struct timespec *); 108static void realtimer_expire(void *); 109 110int register_posix_clock(int, struct kclock *); 111void itimer_fire(struct itimer *it); 112int itimespecfix(struct timespec *ts); 113 114#define CLOCK_CALL(clock, call, arglist) \ 115 ((*posix_clocks[clock].call) arglist) 116 117SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL); 118 119 120static int 121settime(struct thread *td, struct timeval *tv) 122{ 123 struct timeval delta, tv1, tv2; 124 static struct timeval maxtime, laststep; 125 struct timespec ts; 126 127 microtime(&tv1); 128 delta = *tv; 129 timevalsub(&delta, &tv1); 130 131 /* 132 * If the system is secure, we do not allow the time to be 133 * set to a value earlier than 1 second less than the highest 134 * time we have yet seen. The worst a miscreant can do in 135 * this circumstance is "freeze" time. He couldn't go 136 * back to the past. 137 * 138 * We similarly do not allow the clock to be stepped more 139 * than one second, nor more than once per second. This allows 140 * a miscreant to make the clock march double-time, but no worse. 141 */ 142 if (securelevel_gt(td->td_ucred, 1) != 0) { 143 if (delta.tv_sec < 0 || delta.tv_usec < 0) { 144 /* 145 * Update maxtime to latest time we've seen. 146 */ 147 if (tv1.tv_sec > maxtime.tv_sec) 148 maxtime = tv1; 149 tv2 = *tv; 150 timevalsub(&tv2, &maxtime); 151 if (tv2.tv_sec < -1) { 152 tv->tv_sec = maxtime.tv_sec - 1; 153 printf("Time adjustment clamped to -1 second\n"); 154 } 155 } else { 156 if (tv1.tv_sec == laststep.tv_sec) 157 return (EPERM); 158 if (delta.tv_sec > 1) { 159 tv->tv_sec = tv1.tv_sec + 1; 160 printf("Time adjustment clamped to +1 second\n"); 161 } 162 laststep = *tv; 163 } 164 } 165 166 ts.tv_sec = tv->tv_sec; 167 ts.tv_nsec = tv->tv_usec * 1000; 168 tc_setclock(&ts); 169 resettodr(); 170 return (0); 171} 172 173#ifndef _SYS_SYSPROTO_H_ 174struct clock_getcpuclockid2_args { 175 id_t id; 176 int which, 177 clockid_t *clock_id; 178}; 179#endif 180/* ARGSUSED */ 181int 182sys_clock_getcpuclockid2(struct thread *td, struct clock_getcpuclockid2_args *uap) 183{ 184 clockid_t clk_id; 185 int error; 186 187 error = kern_clock_getcpuclockid2(td, uap->id, uap->which, &clk_id); 188 if (error == 0) 189 error = copyout(&clk_id, uap->clock_id, sizeof(clockid_t)); 190 return (error); 191} 192 193int 194kern_clock_getcpuclockid2(struct thread *td, id_t id, int which, 195 clockid_t *clk_id) 196{ 197 struct proc *p; 198 pid_t pid; 199 lwpid_t tid; 200 int error; 201 202 switch (which) { 203 case CPUCLOCK_WHICH_PID: 204 if (id != 0) { 205 error = pget(id, PGET_CANSEE | PGET_NOTID, &p); 206 if (error != 0) 207 return (error); 208 PROC_UNLOCK(p); 209 pid = id; 210 } else { 211 pid = td->td_proc->p_pid; 212 } 213 *clk_id = MAKE_PROCESS_CPUCLOCK(pid); 214 return (0); 215 case CPUCLOCK_WHICH_TID: 216 tid = id == 0 ? td->td_tid : id; 217 *clk_id = MAKE_THREAD_CPUCLOCK(tid); 218 return (0); 219 default: 220 return (EINVAL); 221 } 222} 223 224#ifndef _SYS_SYSPROTO_H_ 225struct clock_gettime_args { 226 clockid_t clock_id; 227 struct timespec *tp; 228}; 229#endif 230/* ARGSUSED */ 231int 232sys_clock_gettime(struct thread *td, struct clock_gettime_args *uap) 233{ 234 struct timespec ats; 235 int error; 236 237 error = kern_clock_gettime(td, uap->clock_id, &ats); 238 if (error == 0) 239 error = copyout(&ats, uap->tp, sizeof(ats)); 240 241 return (error); 242} 243 244static inline void 245cputick2timespec(uint64_t runtime, struct timespec *ats) 246{ 247 runtime = cputick2usec(runtime); 248 ats->tv_sec = runtime / 1000000; 249 ats->tv_nsec = runtime % 1000000 * 1000; 250} 251 252static void 253get_thread_cputime(struct thread *targettd, struct timespec *ats) 254{ 255 uint64_t runtime, curtime, switchtime; 256 257 if (targettd == NULL) { /* current thread */ 258 critical_enter(); 259 switchtime = PCPU_GET(switchtime); 260 curtime = cpu_ticks(); 261 runtime = curthread->td_runtime; 262 critical_exit(); 263 runtime += curtime - switchtime; 264 } else { 265 thread_lock(targettd); 266 runtime = targettd->td_runtime; 267 thread_unlock(targettd); 268 } 269 cputick2timespec(runtime, ats); 270} 271 272static void 273get_process_cputime(struct proc *targetp, struct timespec *ats) 274{ 275 uint64_t runtime; 276 struct rusage ru; 277 278 PROC_STATLOCK(targetp); 279 rufetch(targetp, &ru); 280 runtime = targetp->p_rux.rux_runtime; 281 if (curthread->td_proc == targetp) 282 runtime += cpu_ticks() - PCPU_GET(switchtime); 283 PROC_STATUNLOCK(targetp); 284 cputick2timespec(runtime, ats); 285} 286 287static int 288get_cputime(struct thread *td, clockid_t clock_id, struct timespec *ats) 289{ 290 struct proc *p, *p2; 291 struct thread *td2; 292 lwpid_t tid; 293 pid_t pid; 294 int error; 295 296 p = td->td_proc; 297 if ((clock_id & CPUCLOCK_PROCESS_BIT) == 0) { 298 tid = clock_id & CPUCLOCK_ID_MASK; 299 td2 = tdfind(tid, p->p_pid); 300 if (td2 == NULL) 301 return (EINVAL); 302 get_thread_cputime(td2, ats); 303 PROC_UNLOCK(td2->td_proc); 304 } else { 305 pid = clock_id & CPUCLOCK_ID_MASK; 306 error = pget(pid, PGET_CANSEE, &p2); 307 if (error != 0) 308 return (EINVAL); 309 get_process_cputime(p2, ats); 310 PROC_UNLOCK(p2); 311 } 312 return (0); 313} 314 315int 316kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats) 317{ 318 struct timeval sys, user; 319 struct proc *p; 320 321 p = td->td_proc; 322 switch (clock_id) { 323 case CLOCK_REALTIME: /* Default to precise. */ 324 case CLOCK_REALTIME_PRECISE: 325 nanotime(ats); 326 break; 327 case CLOCK_REALTIME_FAST: 328 getnanotime(ats); 329 break; 330 case CLOCK_VIRTUAL: 331 PROC_LOCK(p); 332 PROC_STATLOCK(p); 333 calcru(p, &user, &sys); 334 PROC_STATUNLOCK(p); 335 PROC_UNLOCK(p); 336 TIMEVAL_TO_TIMESPEC(&user, ats); 337 break; 338 case CLOCK_PROF: 339 PROC_LOCK(p); 340 PROC_STATLOCK(p); 341 calcru(p, &user, &sys); 342 PROC_STATUNLOCK(p); 343 PROC_UNLOCK(p); 344 timevaladd(&user, &sys); 345 TIMEVAL_TO_TIMESPEC(&user, ats); 346 break; 347 case CLOCK_MONOTONIC: /* Default to precise. */ 348 case CLOCK_MONOTONIC_PRECISE: 349 case CLOCK_UPTIME: 350 case CLOCK_UPTIME_PRECISE: 351 nanouptime(ats); 352 break; 353 case CLOCK_UPTIME_FAST: 354 case CLOCK_MONOTONIC_FAST: 355 getnanouptime(ats); 356 break; 357 case CLOCK_SECOND: 358 ats->tv_sec = time_second; 359 ats->tv_nsec = 0; 360 break; 361 case CLOCK_THREAD_CPUTIME_ID: 362 get_thread_cputime(NULL, ats); 363 break; 364 case CLOCK_PROCESS_CPUTIME_ID: 365 PROC_LOCK(p); 366 get_process_cputime(p, ats); 367 PROC_UNLOCK(p); 368 break; 369 default: 370 if ((int)clock_id >= 0) 371 return (EINVAL); 372 return (get_cputime(td, clock_id, ats)); 373 } 374 return (0); 375} 376 377#ifndef _SYS_SYSPROTO_H_ 378struct clock_settime_args { 379 clockid_t clock_id; 380 const struct timespec *tp; 381}; 382#endif 383/* ARGSUSED */ 384int 385sys_clock_settime(struct thread *td, struct clock_settime_args *uap) 386{ 387 struct timespec ats; 388 int error; 389 390 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0) 391 return (error); 392 return (kern_clock_settime(td, uap->clock_id, &ats)); 393} 394 395int 396kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats) 397{ 398 struct timeval atv; 399 int error; 400 401 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0) 402 return (error); 403 if (clock_id != CLOCK_REALTIME) 404 return (EINVAL); 405 if (ats->tv_nsec < 0 || ats->tv_nsec >= 1000000000 || 406 ats->tv_sec < 0) 407 return (EINVAL); 408 /* XXX Don't convert nsec->usec and back */ 409 TIMESPEC_TO_TIMEVAL(&atv, ats); 410 error = settime(td, &atv); 411 return (error); 412} 413 414#ifndef _SYS_SYSPROTO_H_ 415struct clock_getres_args { 416 clockid_t clock_id; 417 struct timespec *tp; 418}; 419#endif 420int 421sys_clock_getres(struct thread *td, struct clock_getres_args *uap) 422{ 423 struct timespec ts; 424 int error; 425 426 if (uap->tp == NULL) 427 return (0); 428 429 error = kern_clock_getres(td, uap->clock_id, &ts); 430 if (error == 0) 431 error = copyout(&ts, uap->tp, sizeof(ts)); 432 return (error); 433} 434 435int 436kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts) 437{ 438 439 ts->tv_sec = 0; 440 switch (clock_id) { 441 case CLOCK_REALTIME: 442 case CLOCK_REALTIME_FAST: 443 case CLOCK_REALTIME_PRECISE: 444 case CLOCK_MONOTONIC: 445 case CLOCK_MONOTONIC_FAST: 446 case CLOCK_MONOTONIC_PRECISE: 447 case CLOCK_UPTIME: 448 case CLOCK_UPTIME_FAST: 449 case CLOCK_UPTIME_PRECISE: 450 /* 451 * Round up the result of the division cheaply by adding 1. 452 * Rounding up is especially important if rounding down 453 * would give 0. Perfect rounding is unimportant. 454 */ 455 ts->tv_nsec = 1000000000 / tc_getfrequency() + 1; 456 break; 457 case CLOCK_VIRTUAL: 458 case CLOCK_PROF: 459 /* Accurately round up here because we can do so cheaply. */ 460 ts->tv_nsec = howmany(1000000000, hz); 461 break; 462 case CLOCK_SECOND: 463 ts->tv_sec = 1; 464 ts->tv_nsec = 0; 465 break; 466 case CLOCK_THREAD_CPUTIME_ID: 467 case CLOCK_PROCESS_CPUTIME_ID: 468 cputime: 469 /* sync with cputick2usec */ 470 ts->tv_nsec = 1000000 / cpu_tickrate(); 471 if (ts->tv_nsec == 0) 472 ts->tv_nsec = 1000; 473 break; 474 default: 475 if ((int)clock_id < 0) 476 goto cputime; 477 return (EINVAL); 478 } 479 return (0); 480} 481 482int 483kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt) 484{ 485 486 return (kern_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME, rqt, 487 rmt)); 488} 489 490static uint8_t nanowait[MAXCPU]; 491 492int 493kern_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags, 494 const struct timespec *rqt, struct timespec *rmt) 495{ 496 struct timespec ts, now; 497 sbintime_t sbt, sbtt, prec, tmp; 498 time_t over; 499 int error; 500 bool is_abs_real; 501 502 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000) 503 return (EINVAL); 504 if ((flags & ~TIMER_ABSTIME) != 0) 505 return (EINVAL); 506 switch (clock_id) { 507 case CLOCK_REALTIME: 508 case CLOCK_REALTIME_PRECISE: 509 case CLOCK_REALTIME_FAST: 510 case CLOCK_SECOND: 511 is_abs_real = (flags & TIMER_ABSTIME) != 0; 512 break; 513 case CLOCK_MONOTONIC: 514 case CLOCK_MONOTONIC_PRECISE: 515 case CLOCK_MONOTONIC_FAST: 516 case CLOCK_UPTIME: 517 case CLOCK_UPTIME_PRECISE: 518 case CLOCK_UPTIME_FAST: 519 is_abs_real = false; 520 break; 521 case CLOCK_VIRTUAL: 522 case CLOCK_PROF: 523 case CLOCK_PROCESS_CPUTIME_ID: 524 return (ENOTSUP); 525 case CLOCK_THREAD_CPUTIME_ID: 526 default: 527 return (EINVAL); 528 } 529 do { 530 ts = *rqt; 531 if ((flags & TIMER_ABSTIME) != 0) { 532 if (is_abs_real) 533 td->td_rtcgen = 534 atomic_load_acq_int(&rtc_generation); 535 error = kern_clock_gettime(td, clock_id, &now); 536 KASSERT(error == 0, ("kern_clock_gettime: %d", error)); 537 timespecsub(&ts, &now); 538 } 539 if (ts.tv_sec < 0 || (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 540 error = EWOULDBLOCK; 541 break; 542 } 543 if (ts.tv_sec > INT32_MAX / 2) { 544 over = ts.tv_sec - INT32_MAX / 2; 545 ts.tv_sec -= over; 546 } else 547 over = 0; 548 tmp = tstosbt(ts); 549 prec = tmp; 550 prec >>= tc_precexp; 551 if (TIMESEL(&sbt, tmp)) 552 sbt += tc_tick_sbt; 553 sbt += tmp; 554 error = tsleep_sbt(&nanowait[curcpu], PWAIT | PCATCH, "nanslp", 555 sbt, prec, C_ABSOLUTE); 556 } while (error == 0 && is_abs_real && td->td_rtcgen == 0); 557 td->td_rtcgen = 0; 558 if (error != EWOULDBLOCK) { 559 if (TIMESEL(&sbtt, tmp)) 560 sbtt += tc_tick_sbt; 561 if (sbtt >= sbt) 562 return (0); 563 if (error == ERESTART) 564 error = EINTR; 565 if ((flags & TIMER_ABSTIME) == 0 && rmt != NULL) { 566 ts = sbttots(sbt - sbtt); 567 ts.tv_sec += over; 568 if (ts.tv_sec < 0) 569 timespecclear(&ts); 570 *rmt = ts; 571 } 572 return (error); 573 } 574 return (0); 575} 576 577#ifndef _SYS_SYSPROTO_H_ 578struct nanosleep_args { 579 struct timespec *rqtp; 580 struct timespec *rmtp; 581}; 582#endif 583/* ARGSUSED */ 584int 585sys_nanosleep(struct thread *td, struct nanosleep_args *uap) 586{ 587 588 return (user_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME, 589 uap->rqtp, uap->rmtp)); 590} 591 592#ifndef _SYS_SYSPROTO_H_ 593struct clock_nanosleep_args { 594 clockid_t clock_id; 595 int flags; 596 struct timespec *rqtp; 597 struct timespec *rmtp; 598}; 599#endif 600/* ARGSUSED */ 601int 602sys_clock_nanosleep(struct thread *td, struct clock_nanosleep_args *uap) 603{ 604 int error; 605 606 error = user_clock_nanosleep(td, uap->clock_id, uap->flags, uap->rqtp, 607 uap->rmtp); 608 return (kern_posix_error(td, error)); 609} 610 611static int 612user_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags, 613 const struct timespec *ua_rqtp, struct timespec *ua_rmtp) 614{ 615 struct timespec rmt, rqt; 616 int error, error2; 617 618 error = copyin(ua_rqtp, &rqt, sizeof(rqt)); 619 if (error) 620 return (error); 621 error = kern_clock_nanosleep(td, clock_id, flags, &rqt, &rmt); 622 if (error == EINTR && ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0) { 623 error2 = copyout(&rmt, ua_rmtp, sizeof(rmt)); 624 if (error2 != 0) 625 error = error2; 626 } 627 return (error); 628} 629 630#ifndef _SYS_SYSPROTO_H_ 631struct gettimeofday_args { 632 struct timeval *tp; 633 struct timezone *tzp; 634}; 635#endif 636/* ARGSUSED */ 637int 638sys_gettimeofday(struct thread *td, struct gettimeofday_args *uap) 639{ 640 struct timeval atv; 641 struct timezone rtz; 642 int error = 0; 643 644 if (uap->tp) { 645 microtime(&atv); 646 error = copyout(&atv, uap->tp, sizeof (atv)); 647 } 648 if (error == 0 && uap->tzp != NULL) { 649 rtz.tz_minuteswest = tz_minuteswest; 650 rtz.tz_dsttime = tz_dsttime; 651 error = copyout(&rtz, uap->tzp, sizeof (rtz)); 652 } 653 return (error); 654} 655 656#ifndef _SYS_SYSPROTO_H_ 657struct settimeofday_args { 658 struct timeval *tv; 659 struct timezone *tzp; 660}; 661#endif 662/* ARGSUSED */ 663int 664sys_settimeofday(struct thread *td, struct settimeofday_args *uap) 665{ 666 struct timeval atv, *tvp; 667 struct timezone atz, *tzp; 668 int error; 669 670 if (uap->tv) { 671 error = copyin(uap->tv, &atv, sizeof(atv)); 672 if (error) 673 return (error); 674 tvp = &atv; 675 } else 676 tvp = NULL; 677 if (uap->tzp) { 678 error = copyin(uap->tzp, &atz, sizeof(atz)); 679 if (error) 680 return (error); 681 tzp = &atz; 682 } else 683 tzp = NULL; 684 return (kern_settimeofday(td, tvp, tzp)); 685} 686 687int 688kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp) 689{ 690 int error; 691 692 error = priv_check(td, PRIV_SETTIMEOFDAY); 693 if (error) 694 return (error); 695 /* Verify all parameters before changing time. */ 696 if (tv) { 697 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000 || 698 tv->tv_sec < 0) 699 return (EINVAL); 700 error = settime(td, tv); 701 } 702 if (tzp && error == 0) { 703 tz_minuteswest = tzp->tz_minuteswest; 704 tz_dsttime = tzp->tz_dsttime; 705 } 706 return (error); 707} 708 709/* 710 * Get value of an interval timer. The process virtual and profiling virtual 711 * time timers are kept in the p_stats area, since they can be swapped out. 712 * These are kept internally in the way they are specified externally: in 713 * time until they expire. 714 * 715 * The real time interval timer is kept in the process table slot for the 716 * process, and its value (it_value) is kept as an absolute time rather than 717 * as a delta, so that it is easy to keep periodic real-time signals from 718 * drifting. 719 * 720 * Virtual time timers are processed in the hardclock() routine of 721 * kern_clock.c. The real time timer is processed by a timeout routine, 722 * called from the softclock() routine. Since a callout may be delayed in 723 * real time due to interrupt processing in the system, it is possible for 724 * the real time timeout routine (realitexpire, given below), to be delayed 725 * in real time past when it is supposed to occur. It does not suffice, 726 * therefore, to reload the real timer .it_value from the real time timers 727 * .it_interval. Rather, we compute the next time in absolute time the timer 728 * should go off. 729 */ 730#ifndef _SYS_SYSPROTO_H_ 731struct getitimer_args { 732 u_int which; 733 struct itimerval *itv; 734}; 735#endif 736int 737sys_getitimer(struct thread *td, struct getitimer_args *uap) 738{ 739 struct itimerval aitv; 740 int error; 741 742 error = kern_getitimer(td, uap->which, &aitv); 743 if (error != 0) 744 return (error); 745 return (copyout(&aitv, uap->itv, sizeof (struct itimerval))); 746} 747 748int 749kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv) 750{ 751 struct proc *p = td->td_proc; 752 struct timeval ctv; 753 754 if (which > ITIMER_PROF) 755 return (EINVAL); 756 757 if (which == ITIMER_REAL) { 758 /* 759 * Convert from absolute to relative time in .it_value 760 * part of real time timer. If time for real time timer 761 * has passed return 0, else return difference between 762 * current time and time for the timer to go off. 763 */ 764 PROC_LOCK(p); 765 *aitv = p->p_realtimer; 766 PROC_UNLOCK(p); 767 if (timevalisset(&aitv->it_value)) { 768 microuptime(&ctv); 769 if (timevalcmp(&aitv->it_value, &ctv, <)) 770 timevalclear(&aitv->it_value); 771 else 772 timevalsub(&aitv->it_value, &ctv); 773 } 774 } else { 775 PROC_ITIMLOCK(p); 776 *aitv = p->p_stats->p_timer[which]; 777 PROC_ITIMUNLOCK(p); 778 } 779#ifdef KTRACE 780 if (KTRPOINT(td, KTR_STRUCT)) 781 ktritimerval(aitv); 782#endif 783 return (0); 784} 785 786#ifndef _SYS_SYSPROTO_H_ 787struct setitimer_args { 788 u_int which; 789 struct itimerval *itv, *oitv; 790}; 791#endif 792int 793sys_setitimer(struct thread *td, struct setitimer_args *uap) 794{ 795 struct itimerval aitv, oitv; 796 int error; 797 798 if (uap->itv == NULL) { 799 uap->itv = uap->oitv; 800 return (sys_getitimer(td, (struct getitimer_args *)uap)); 801 } 802 803 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval)))) 804 return (error); 805 error = kern_setitimer(td, uap->which, &aitv, &oitv); 806 if (error != 0 || uap->oitv == NULL) 807 return (error); 808 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval))); 809} 810 811int 812kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv, 813 struct itimerval *oitv) 814{ 815 struct proc *p = td->td_proc; 816 struct timeval ctv; 817 sbintime_t sbt, pr; 818 819 if (aitv == NULL) 820 return (kern_getitimer(td, which, oitv)); 821 822 if (which > ITIMER_PROF) 823 return (EINVAL); 824#ifdef KTRACE 825 if (KTRPOINT(td, KTR_STRUCT)) 826 ktritimerval(aitv); 827#endif 828 if (itimerfix(&aitv->it_value) || 829 aitv->it_value.tv_sec > INT32_MAX / 2) 830 return (EINVAL); 831 if (!timevalisset(&aitv->it_value)) 832 timevalclear(&aitv->it_interval); 833 else if (itimerfix(&aitv->it_interval) || 834 aitv->it_interval.tv_sec > INT32_MAX / 2) 835 return (EINVAL); 836 837 if (which == ITIMER_REAL) { 838 PROC_LOCK(p); 839 if (timevalisset(&p->p_realtimer.it_value)) 840 callout_stop(&p->p_itcallout); 841 microuptime(&ctv); 842 if (timevalisset(&aitv->it_value)) { 843 pr = tvtosbt(aitv->it_value) >> tc_precexp; 844 timevaladd(&aitv->it_value, &ctv); 845 sbt = tvtosbt(aitv->it_value); 846 callout_reset_sbt(&p->p_itcallout, sbt, pr, 847 realitexpire, p, C_ABSOLUTE); 848 } 849 *oitv = p->p_realtimer; 850 p->p_realtimer = *aitv; 851 PROC_UNLOCK(p); 852 if (timevalisset(&oitv->it_value)) { 853 if (timevalcmp(&oitv->it_value, &ctv, <)) 854 timevalclear(&oitv->it_value); 855 else 856 timevalsub(&oitv->it_value, &ctv); 857 } 858 } else { 859 if (aitv->it_interval.tv_sec == 0 && 860 aitv->it_interval.tv_usec != 0 && 861 aitv->it_interval.tv_usec < tick) 862 aitv->it_interval.tv_usec = tick; 863 if (aitv->it_value.tv_sec == 0 && 864 aitv->it_value.tv_usec != 0 && 865 aitv->it_value.tv_usec < tick) 866 aitv->it_value.tv_usec = tick; 867 PROC_ITIMLOCK(p); 868 *oitv = p->p_stats->p_timer[which]; 869 p->p_stats->p_timer[which] = *aitv; 870 PROC_ITIMUNLOCK(p); 871 } 872#ifdef KTRACE 873 if (KTRPOINT(td, KTR_STRUCT)) 874 ktritimerval(oitv); 875#endif 876 return (0); 877} 878 879/* 880 * Real interval timer expired: 881 * send process whose timer expired an alarm signal. 882 * If time is not set up to reload, then just return. 883 * Else compute next time timer should go off which is > current time. 884 * This is where delay in processing this timeout causes multiple 885 * SIGALRM calls to be compressed into one. 886 * tvtohz() always adds 1 to allow for the time until the next clock 887 * interrupt being strictly less than 1 clock tick, but we don't want 888 * that here since we want to appear to be in sync with the clock 889 * interrupt even when we're delayed. 890 */ 891void 892realitexpire(void *arg) 893{ 894 struct proc *p; 895 struct timeval ctv; 896 sbintime_t isbt; 897 898 p = (struct proc *)arg; 899 kern_psignal(p, SIGALRM); 900 if (!timevalisset(&p->p_realtimer.it_interval)) { 901 timevalclear(&p->p_realtimer.it_value); 902 if (p->p_flag & P_WEXIT) 903 wakeup(&p->p_itcallout); 904 return; 905 } 906 isbt = tvtosbt(p->p_realtimer.it_interval); 907 if (isbt >= sbt_timethreshold) 908 getmicrouptime(&ctv); 909 else 910 microuptime(&ctv); 911 do { 912 timevaladd(&p->p_realtimer.it_value, 913 &p->p_realtimer.it_interval); 914 } while (timevalcmp(&p->p_realtimer.it_value, &ctv, <=)); 915 callout_reset_sbt(&p->p_itcallout, tvtosbt(p->p_realtimer.it_value), 916 isbt >> tc_precexp, realitexpire, p, C_ABSOLUTE); 917} 918 919/* 920 * Check that a proposed value to load into the .it_value or 921 * .it_interval part of an interval timer is acceptable, and 922 * fix it to have at least minimal value (i.e. if it is less 923 * than the resolution of the clock, round it up.) 924 */ 925int 926itimerfix(struct timeval *tv) 927{ 928 929 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000) 930 return (EINVAL); 931 if (tv->tv_sec == 0 && tv->tv_usec != 0 && 932 tv->tv_usec < (u_int)tick / 16) 933 tv->tv_usec = (u_int)tick / 16; 934 return (0); 935} 936 937/* 938 * Decrement an interval timer by a specified number 939 * of microseconds, which must be less than a second, 940 * i.e. < 1000000. If the timer expires, then reload 941 * it. In this case, carry over (usec - old value) to 942 * reduce the value reloaded into the timer so that 943 * the timer does not drift. This routine assumes 944 * that it is called in a context where the timers 945 * on which it is operating cannot change in value. 946 */ 947int 948itimerdecr(struct itimerval *itp, int usec) 949{ 950 951 if (itp->it_value.tv_usec < usec) { 952 if (itp->it_value.tv_sec == 0) { 953 /* expired, and already in next interval */ 954 usec -= itp->it_value.tv_usec; 955 goto expire; 956 } 957 itp->it_value.tv_usec += 1000000; 958 itp->it_value.tv_sec--; 959 } 960 itp->it_value.tv_usec -= usec; 961 usec = 0; 962 if (timevalisset(&itp->it_value)) 963 return (1); 964 /* expired, exactly at end of interval */ 965expire: 966 if (timevalisset(&itp->it_interval)) { 967 itp->it_value = itp->it_interval; 968 itp->it_value.tv_usec -= usec; 969 if (itp->it_value.tv_usec < 0) { 970 itp->it_value.tv_usec += 1000000; 971 itp->it_value.tv_sec--; 972 } 973 } else 974 itp->it_value.tv_usec = 0; /* sec is already 0 */ 975 return (0); 976} 977 978/* 979 * Add and subtract routines for timevals. 980 * N.B.: subtract routine doesn't deal with 981 * results which are before the beginning, 982 * it just gets very confused in this case. 983 * Caveat emptor. 984 */ 985void 986timevaladd(struct timeval *t1, const struct timeval *t2) 987{ 988 989 t1->tv_sec += t2->tv_sec; 990 t1->tv_usec += t2->tv_usec; 991 timevalfix(t1); 992} 993 994void 995timevalsub(struct timeval *t1, const struct timeval *t2) 996{ 997 998 t1->tv_sec -= t2->tv_sec; 999 t1->tv_usec -= t2->tv_usec; 1000 timevalfix(t1); 1001} 1002 1003static void 1004timevalfix(struct timeval *t1) 1005{ 1006 1007 if (t1->tv_usec < 0) { 1008 t1->tv_sec--; 1009 t1->tv_usec += 1000000; 1010 } 1011 if (t1->tv_usec >= 1000000) { 1012 t1->tv_sec++; 1013 t1->tv_usec -= 1000000; 1014 } 1015} 1016 1017/* 1018 * ratecheck(): simple time-based rate-limit checking. 1019 */ 1020int 1021ratecheck(struct timeval *lasttime, const struct timeval *mininterval) 1022{ 1023 struct timeval tv, delta; 1024 int rv = 0; 1025 1026 getmicrouptime(&tv); /* NB: 10ms precision */ 1027 delta = tv; 1028 timevalsub(&delta, lasttime); 1029 1030 /* 1031 * check for 0,0 is so that the message will be seen at least once, 1032 * even if interval is huge. 1033 */ 1034 if (timevalcmp(&delta, mininterval, >=) || 1035 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) { 1036 *lasttime = tv; 1037 rv = 1; 1038 } 1039 1040 return (rv); 1041} 1042 1043/* 1044 * ppsratecheck(): packets (or events) per second limitation. 1045 * 1046 * Return 0 if the limit is to be enforced (e.g. the caller 1047 * should drop a packet because of the rate limitation). 1048 * 1049 * maxpps of 0 always causes zero to be returned. maxpps of -1 1050 * always causes 1 to be returned; this effectively defeats rate 1051 * limiting. 1052 * 1053 * Note that we maintain the struct timeval for compatibility 1054 * with other bsd systems. We reuse the storage and just monitor 1055 * clock ticks for minimal overhead. 1056 */ 1057int 1058ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps) 1059{ 1060 int now; 1061 1062 /* 1063 * Reset the last time and counter if this is the first call 1064 * or more than a second has passed since the last update of 1065 * lasttime. 1066 */ 1067 now = ticks; 1068 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) { 1069 lasttime->tv_sec = now; 1070 *curpps = 1; 1071 return (maxpps != 0); 1072 } else { 1073 (*curpps)++; /* NB: ignore potential overflow */ 1074 return (maxpps < 0 || *curpps <= maxpps); 1075 } 1076} 1077 1078static void 1079itimer_start(void) 1080{ 1081 struct kclock rt_clock = { 1082 .timer_create = realtimer_create, 1083 .timer_delete = realtimer_delete, 1084 .timer_settime = realtimer_settime, 1085 .timer_gettime = realtimer_gettime, 1086 .event_hook = NULL 1087 }; 1088 1089 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer), 1090 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0); 1091 register_posix_clock(CLOCK_REALTIME, &rt_clock); 1092 register_posix_clock(CLOCK_MONOTONIC, &rt_clock); 1093 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L); 1094 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX); 1095 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX); 1096 EVENTHANDLER_REGISTER(process_exit, itimers_event_hook_exit, 1097 (void *)ITIMER_EV_EXIT, EVENTHANDLER_PRI_ANY); 1098 EVENTHANDLER_REGISTER(process_exec, itimers_event_hook_exec, 1099 (void *)ITIMER_EV_EXEC, EVENTHANDLER_PRI_ANY); 1100} 1101 1102int 1103register_posix_clock(int clockid, struct kclock *clk) 1104{ 1105 if ((unsigned)clockid >= MAX_CLOCKS) { 1106 printf("%s: invalid clockid\n", __func__); 1107 return (0); 1108 } 1109 posix_clocks[clockid] = *clk; 1110 return (1); 1111} 1112 1113static int 1114itimer_init(void *mem, int size, int flags) 1115{ 1116 struct itimer *it; 1117 1118 it = (struct itimer *)mem; 1119 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF); 1120 return (0); 1121} 1122 1123static void 1124itimer_fini(void *mem, int size) 1125{ 1126 struct itimer *it; 1127 1128 it = (struct itimer *)mem; 1129 mtx_destroy(&it->it_mtx); 1130} 1131 1132static void 1133itimer_enter(struct itimer *it) 1134{ 1135 1136 mtx_assert(&it->it_mtx, MA_OWNED); 1137 it->it_usecount++; 1138} 1139 1140static void 1141itimer_leave(struct itimer *it) 1142{ 1143 1144 mtx_assert(&it->it_mtx, MA_OWNED); 1145 KASSERT(it->it_usecount > 0, ("invalid it_usecount")); 1146 1147 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0) 1148 wakeup(it); 1149} 1150 1151#ifndef _SYS_SYSPROTO_H_ 1152struct ktimer_create_args { 1153 clockid_t clock_id; 1154 struct sigevent * evp; 1155 int * timerid; 1156}; 1157#endif 1158int 1159sys_ktimer_create(struct thread *td, struct ktimer_create_args *uap) 1160{ 1161 struct sigevent *evp, ev; 1162 int id; 1163 int error; 1164 1165 if (uap->evp == NULL) { 1166 evp = NULL; 1167 } else { 1168 error = copyin(uap->evp, &ev, sizeof(ev)); 1169 if (error != 0) 1170 return (error); 1171 evp = &ev; 1172 } 1173 error = kern_ktimer_create(td, uap->clock_id, evp, &id, -1); 1174 if (error == 0) { 1175 error = copyout(&id, uap->timerid, sizeof(int)); 1176 if (error != 0) 1177 kern_ktimer_delete(td, id); 1178 } 1179 return (error); 1180} 1181 1182int 1183kern_ktimer_create(struct thread *td, clockid_t clock_id, struct sigevent *evp, 1184 int *timerid, int preset_id) 1185{ 1186 struct proc *p = td->td_proc; 1187 struct itimer *it; 1188 int id; 1189 int error; 1190 1191 if (clock_id < 0 || clock_id >= MAX_CLOCKS) 1192 return (EINVAL); 1193 1194 if (posix_clocks[clock_id].timer_create == NULL) 1195 return (EINVAL); 1196 1197 if (evp != NULL) { 1198 if (evp->sigev_notify != SIGEV_NONE && 1199 evp->sigev_notify != SIGEV_SIGNAL && 1200 evp->sigev_notify != SIGEV_THREAD_ID) 1201 return (EINVAL); 1202 if ((evp->sigev_notify == SIGEV_SIGNAL || 1203 evp->sigev_notify == SIGEV_THREAD_ID) && 1204 !_SIG_VALID(evp->sigev_signo)) 1205 return (EINVAL); 1206 } 1207 1208 if (p->p_itimers == NULL) 1209 itimers_alloc(p); 1210 1211 it = uma_zalloc(itimer_zone, M_WAITOK); 1212 it->it_flags = 0; 1213 it->it_usecount = 0; 1214 it->it_active = 0; 1215 timespecclear(&it->it_time.it_value); 1216 timespecclear(&it->it_time.it_interval); 1217 it->it_overrun = 0; 1218 it->it_overrun_last = 0; 1219 it->it_clockid = clock_id; 1220 it->it_timerid = -1; 1221 it->it_proc = p; 1222 ksiginfo_init(&it->it_ksi); 1223 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT; 1224 error = CLOCK_CALL(clock_id, timer_create, (it)); 1225 if (error != 0) 1226 goto out; 1227 1228 PROC_LOCK(p); 1229 if (preset_id != -1) { 1230 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id")); 1231 id = preset_id; 1232 if (p->p_itimers->its_timers[id] != NULL) { 1233 PROC_UNLOCK(p); 1234 error = 0; 1235 goto out; 1236 } 1237 } else { 1238 /* 1239 * Find a free timer slot, skipping those reserved 1240 * for setitimer(). 1241 */ 1242 for (id = 3; id < TIMER_MAX; id++) 1243 if (p->p_itimers->its_timers[id] == NULL) 1244 break; 1245 if (id == TIMER_MAX) { 1246 PROC_UNLOCK(p); 1247 error = EAGAIN; 1248 goto out; 1249 } 1250 } 1251 it->it_timerid = id; 1252 p->p_itimers->its_timers[id] = it; 1253 if (evp != NULL) 1254 it->it_sigev = *evp; 1255 else { 1256 it->it_sigev.sigev_notify = SIGEV_SIGNAL; 1257 switch (clock_id) { 1258 default: 1259 case CLOCK_REALTIME: 1260 it->it_sigev.sigev_signo = SIGALRM; 1261 break; 1262 case CLOCK_VIRTUAL: 1263 it->it_sigev.sigev_signo = SIGVTALRM; 1264 break; 1265 case CLOCK_PROF: 1266 it->it_sigev.sigev_signo = SIGPROF; 1267 break; 1268 } 1269 it->it_sigev.sigev_value.sival_int = id; 1270 } 1271 1272 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || 1273 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { 1274 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo; 1275 it->it_ksi.ksi_code = SI_TIMER; 1276 it->it_ksi.ksi_value = it->it_sigev.sigev_value; 1277 it->it_ksi.ksi_timerid = id; 1278 } 1279 PROC_UNLOCK(p); 1280 *timerid = id; 1281 return (0); 1282 1283out: 1284 ITIMER_LOCK(it); 1285 CLOCK_CALL(it->it_clockid, timer_delete, (it)); 1286 ITIMER_UNLOCK(it); 1287 uma_zfree(itimer_zone, it); 1288 return (error); 1289} 1290 1291#ifndef _SYS_SYSPROTO_H_ 1292struct ktimer_delete_args { 1293 int timerid; 1294}; 1295#endif 1296int 1297sys_ktimer_delete(struct thread *td, struct ktimer_delete_args *uap) 1298{ 1299 1300 return (kern_ktimer_delete(td, uap->timerid)); 1301} 1302 1303static struct itimer * 1304itimer_find(struct proc *p, int timerid) 1305{ 1306 struct itimer *it; 1307 1308 PROC_LOCK_ASSERT(p, MA_OWNED); 1309 if ((p->p_itimers == NULL) || 1310 (timerid < 0) || (timerid >= TIMER_MAX) || 1311 (it = p->p_itimers->its_timers[timerid]) == NULL) { 1312 return (NULL); 1313 } 1314 ITIMER_LOCK(it); 1315 if ((it->it_flags & ITF_DELETING) != 0) { 1316 ITIMER_UNLOCK(it); 1317 it = NULL; 1318 } 1319 return (it); 1320} 1321 1322int 1323kern_ktimer_delete(struct thread *td, int timerid) 1324{ 1325 struct proc *p = td->td_proc; 1326 struct itimer *it; 1327 1328 PROC_LOCK(p); 1329 it = itimer_find(p, timerid); 1330 if (it == NULL) { 1331 PROC_UNLOCK(p); 1332 return (EINVAL); 1333 } 1334 PROC_UNLOCK(p); 1335 1336 it->it_flags |= ITF_DELETING; 1337 while (it->it_usecount > 0) { 1338 it->it_flags |= ITF_WANTED; 1339 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0); 1340 } 1341 it->it_flags &= ~ITF_WANTED; 1342 CLOCK_CALL(it->it_clockid, timer_delete, (it)); 1343 ITIMER_UNLOCK(it); 1344 1345 PROC_LOCK(p); 1346 if (KSI_ONQ(&it->it_ksi)) 1347 sigqueue_take(&it->it_ksi); 1348 p->p_itimers->its_timers[timerid] = NULL; 1349 PROC_UNLOCK(p); 1350 uma_zfree(itimer_zone, it); 1351 return (0); 1352} 1353 1354#ifndef _SYS_SYSPROTO_H_ 1355struct ktimer_settime_args { 1356 int timerid; 1357 int flags; 1358 const struct itimerspec * value; 1359 struct itimerspec * ovalue; 1360}; 1361#endif 1362int 1363sys_ktimer_settime(struct thread *td, struct ktimer_settime_args *uap) 1364{ 1365 struct itimerspec val, oval, *ovalp; 1366 int error; 1367 1368 error = copyin(uap->value, &val, sizeof(val)); 1369 if (error != 0) 1370 return (error); 1371 ovalp = uap->ovalue != NULL ? &oval : NULL; 1372 error = kern_ktimer_settime(td, uap->timerid, uap->flags, &val, ovalp); 1373 if (error == 0 && uap->ovalue != NULL) 1374 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp)); 1375 return (error); 1376} 1377 1378int 1379kern_ktimer_settime(struct thread *td, int timer_id, int flags, 1380 struct itimerspec *val, struct itimerspec *oval) 1381{ 1382 struct proc *p; 1383 struct itimer *it; 1384 int error; 1385 1386 p = td->td_proc; 1387 PROC_LOCK(p); 1388 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) { 1389 PROC_UNLOCK(p); 1390 error = EINVAL; 1391 } else { 1392 PROC_UNLOCK(p); 1393 itimer_enter(it); 1394 error = CLOCK_CALL(it->it_clockid, timer_settime, (it, 1395 flags, val, oval)); 1396 itimer_leave(it); 1397 ITIMER_UNLOCK(it); 1398 } 1399 return (error); 1400} 1401 1402#ifndef _SYS_SYSPROTO_H_ 1403struct ktimer_gettime_args { 1404 int timerid; 1405 struct itimerspec * value; 1406}; 1407#endif 1408int 1409sys_ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap) 1410{ 1411 struct itimerspec val; 1412 int error; 1413 1414 error = kern_ktimer_gettime(td, uap->timerid, &val); 1415 if (error == 0) 1416 error = copyout(&val, uap->value, sizeof(val)); 1417 return (error); 1418} 1419 1420int 1421kern_ktimer_gettime(struct thread *td, int timer_id, struct itimerspec *val) 1422{ 1423 struct proc *p; 1424 struct itimer *it; 1425 int error; 1426 1427 p = td->td_proc; 1428 PROC_LOCK(p); 1429 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) { 1430 PROC_UNLOCK(p); 1431 error = EINVAL; 1432 } else { 1433 PROC_UNLOCK(p); 1434 itimer_enter(it); 1435 error = CLOCK_CALL(it->it_clockid, timer_gettime, (it, val)); 1436 itimer_leave(it); 1437 ITIMER_UNLOCK(it); 1438 } 1439 return (error); 1440} 1441 1442#ifndef _SYS_SYSPROTO_H_ 1443struct timer_getoverrun_args { 1444 int timerid; 1445}; 1446#endif 1447int 1448sys_ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap) 1449{ 1450 1451 return (kern_ktimer_getoverrun(td, uap->timerid)); 1452} 1453 1454int 1455kern_ktimer_getoverrun(struct thread *td, int timer_id) 1456{ 1457 struct proc *p = td->td_proc; 1458 struct itimer *it; 1459 int error ; 1460 1461 PROC_LOCK(p); 1462 if (timer_id < 3 || 1463 (it = itimer_find(p, timer_id)) == NULL) { 1464 PROC_UNLOCK(p); 1465 error = EINVAL; 1466 } else { 1467 td->td_retval[0] = it->it_overrun_last; 1468 ITIMER_UNLOCK(it); 1469 PROC_UNLOCK(p); 1470 error = 0; 1471 } 1472 return (error); 1473} 1474 1475static int 1476realtimer_create(struct itimer *it) 1477{ 1478 callout_init_mtx(&it->it_callout, &it->it_mtx, 0); 1479 return (0); 1480} 1481 1482static int 1483realtimer_delete(struct itimer *it) 1484{ 1485 mtx_assert(&it->it_mtx, MA_OWNED); 1486 1487 /* 1488 * clear timer's value and interval to tell realtimer_expire 1489 * to not rearm the timer. 1490 */ 1491 timespecclear(&it->it_time.it_value); 1492 timespecclear(&it->it_time.it_interval); 1493 ITIMER_UNLOCK(it); 1494 callout_drain(&it->it_callout); 1495 ITIMER_LOCK(it); 1496 return (0); 1497} 1498 1499static int 1500realtimer_gettime(struct itimer *it, struct itimerspec *ovalue) 1501{ 1502 struct timespec cts; 1503 1504 mtx_assert(&it->it_mtx, MA_OWNED); 1505 1506 realtimer_clocktime(it->it_clockid, &cts); 1507 *ovalue = it->it_time; 1508 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) { 1509 timespecsub(&ovalue->it_value, &cts); 1510 if (ovalue->it_value.tv_sec < 0 || 1511 (ovalue->it_value.tv_sec == 0 && 1512 ovalue->it_value.tv_nsec == 0)) { 1513 ovalue->it_value.tv_sec = 0; 1514 ovalue->it_value.tv_nsec = 1; 1515 } 1516 } 1517 return (0); 1518} 1519 1520static int 1521realtimer_settime(struct itimer *it, int flags, 1522 struct itimerspec *value, struct itimerspec *ovalue) 1523{ 1524 struct timespec cts, ts; 1525 struct timeval tv; 1526 struct itimerspec val; 1527 1528 mtx_assert(&it->it_mtx, MA_OWNED); 1529 1530 val = *value; 1531 if (itimespecfix(&val.it_value)) 1532 return (EINVAL); 1533 1534 if (timespecisset(&val.it_value)) { 1535 if (itimespecfix(&val.it_interval)) 1536 return (EINVAL); 1537 } else { 1538 timespecclear(&val.it_interval); 1539 } 1540 1541 if (ovalue != NULL) 1542 realtimer_gettime(it, ovalue); 1543 1544 it->it_time = val; 1545 if (timespecisset(&val.it_value)) { 1546 realtimer_clocktime(it->it_clockid, &cts); 1547 ts = val.it_value; 1548 if ((flags & TIMER_ABSTIME) == 0) { 1549 /* Convert to absolute time. */ 1550 timespecadd(&it->it_time.it_value, &cts); 1551 } else { 1552 timespecsub(&ts, &cts); 1553 /* 1554 * We don't care if ts is negative, tztohz will 1555 * fix it. 1556 */ 1557 } 1558 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1559 callout_reset(&it->it_callout, tvtohz(&tv), 1560 realtimer_expire, it); 1561 } else { 1562 callout_stop(&it->it_callout); 1563 } 1564 1565 return (0); 1566} 1567 1568static void 1569realtimer_clocktime(clockid_t id, struct timespec *ts) 1570{ 1571 if (id == CLOCK_REALTIME) 1572 getnanotime(ts); 1573 else /* CLOCK_MONOTONIC */ 1574 getnanouptime(ts); 1575} 1576 1577int 1578itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi) 1579{ 1580 struct itimer *it; 1581 1582 PROC_LOCK_ASSERT(p, MA_OWNED); 1583 it = itimer_find(p, timerid); 1584 if (it != NULL) { 1585 ksi->ksi_overrun = it->it_overrun; 1586 it->it_overrun_last = it->it_overrun; 1587 it->it_overrun = 0; 1588 ITIMER_UNLOCK(it); 1589 return (0); 1590 } 1591 return (EINVAL); 1592} 1593 1594int 1595itimespecfix(struct timespec *ts) 1596{ 1597 1598 if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 1599 return (EINVAL); 1600 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000) 1601 ts->tv_nsec = tick * 1000; 1602 return (0); 1603} 1604 1605/* Timeout callback for realtime timer */ 1606static void 1607realtimer_expire(void *arg) 1608{ 1609 struct timespec cts, ts; 1610 struct timeval tv; 1611 struct itimer *it; 1612 1613 it = (struct itimer *)arg; 1614 1615 realtimer_clocktime(it->it_clockid, &cts); 1616 /* Only fire if time is reached. */ 1617 if (timespeccmp(&cts, &it->it_time.it_value, >=)) { 1618 if (timespecisset(&it->it_time.it_interval)) { 1619 timespecadd(&it->it_time.it_value, 1620 &it->it_time.it_interval); 1621 while (timespeccmp(&cts, &it->it_time.it_value, >=)) { 1622 if (it->it_overrun < INT_MAX) 1623 it->it_overrun++; 1624 else 1625 it->it_ksi.ksi_errno = ERANGE; 1626 timespecadd(&it->it_time.it_value, 1627 &it->it_time.it_interval); 1628 } 1629 } else { 1630 /* single shot timer ? */ 1631 timespecclear(&it->it_time.it_value); 1632 } 1633 if (timespecisset(&it->it_time.it_value)) { 1634 ts = it->it_time.it_value; 1635 timespecsub(&ts, &cts); 1636 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1637 callout_reset(&it->it_callout, tvtohz(&tv), 1638 realtimer_expire, it); 1639 } 1640 itimer_enter(it); 1641 ITIMER_UNLOCK(it); 1642 itimer_fire(it); 1643 ITIMER_LOCK(it); 1644 itimer_leave(it); 1645 } else if (timespecisset(&it->it_time.it_value)) { 1646 ts = it->it_time.it_value; 1647 timespecsub(&ts, &cts); 1648 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1649 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire, 1650 it); 1651 } 1652} 1653 1654void 1655itimer_fire(struct itimer *it) 1656{ 1657 struct proc *p = it->it_proc; 1658 struct thread *td; 1659 1660 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || 1661 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { 1662 if (sigev_findtd(p, &it->it_sigev, &td) != 0) { 1663 ITIMER_LOCK(it); 1664 timespecclear(&it->it_time.it_value); 1665 timespecclear(&it->it_time.it_interval); 1666 callout_stop(&it->it_callout); 1667 ITIMER_UNLOCK(it); 1668 return; 1669 } 1670 if (!KSI_ONQ(&it->it_ksi)) { 1671 it->it_ksi.ksi_errno = 0; 1672 ksiginfo_set_sigev(&it->it_ksi, &it->it_sigev); 1673 tdsendsignal(p, td, it->it_ksi.ksi_signo, &it->it_ksi); 1674 } else { 1675 if (it->it_overrun < INT_MAX) 1676 it->it_overrun++; 1677 else 1678 it->it_ksi.ksi_errno = ERANGE; 1679 } 1680 PROC_UNLOCK(p); 1681 } 1682} 1683 1684static void 1685itimers_alloc(struct proc *p) 1686{ 1687 struct itimers *its; 1688 int i; 1689 1690 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO); 1691 LIST_INIT(&its->its_virtual); 1692 LIST_INIT(&its->its_prof); 1693 TAILQ_INIT(&its->its_worklist); 1694 for (i = 0; i < TIMER_MAX; i++) 1695 its->its_timers[i] = NULL; 1696 PROC_LOCK(p); 1697 if (p->p_itimers == NULL) { 1698 p->p_itimers = its; 1699 PROC_UNLOCK(p); 1700 } 1701 else { 1702 PROC_UNLOCK(p); 1703 free(its, M_SUBPROC); 1704 } 1705} 1706 1707static void 1708itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp __unused) 1709{ 1710 itimers_event_hook_exit(arg, p); 1711} 1712 1713/* Clean up timers when some process events are being triggered. */ 1714static void 1715itimers_event_hook_exit(void *arg, struct proc *p) 1716{ 1717 struct itimers *its; 1718 struct itimer *it; 1719 int event = (int)(intptr_t)arg; 1720 int i; 1721 1722 if (p->p_itimers != NULL) { 1723 its = p->p_itimers; 1724 for (i = 0; i < MAX_CLOCKS; ++i) { 1725 if (posix_clocks[i].event_hook != NULL) 1726 CLOCK_CALL(i, event_hook, (p, i, event)); 1727 } 1728 /* 1729 * According to susv3, XSI interval timers should be inherited 1730 * by new image. 1731 */ 1732 if (event == ITIMER_EV_EXEC) 1733 i = 3; 1734 else if (event == ITIMER_EV_EXIT) 1735 i = 0; 1736 else 1737 panic("unhandled event"); 1738 for (; i < TIMER_MAX; ++i) { 1739 if ((it = its->its_timers[i]) != NULL) 1740 kern_ktimer_delete(curthread, i); 1741 } 1742 if (its->its_timers[0] == NULL && 1743 its->its_timers[1] == NULL && 1744 its->its_timers[2] == NULL) { 1745 free(its, M_SUBPROC); 1746 p->p_itimers = NULL; 1747 } 1748 } 1749} 1750