Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_time.c
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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 * @(#)kern_time.c 8.1 (Berkeley) 6/10/93 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_ktrace.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/limits.h> 42 #include <sys/clock.h> 43 #include <sys/lock.h> 44 #include <sys/mutex.h> 45 #include <sys/sysproto.h> 46 #include <sys/resourcevar.h> 47 #include <sys/signalvar.h> 48 #include <sys/kernel.h> 49 #include <sys/sleepqueue.h> 50 #include <sys/syscallsubr.h> 51 #include <sys/sysctl.h> 52 #include <sys/sysent.h> 53 #include <sys/priv.h> 54 #include <sys/proc.h> 55 #include <sys/posix4.h> 56 #include <sys/time.h> 57 #include <sys/timers.h> 58 #include <sys/timetc.h> 59 #include <sys/vnode.h> 60 #ifdef KTRACE 61 #include <sys/ktrace.h> 62 #endif 63 64 #include <vm/vm.h> 65 #include <vm/vm_extern.h> 66 67 #define MAX_CLOCKS (CLOCK_MONOTONIC+1) 68 #define CPUCLOCK_BIT 0x80000000 69 #define CPUCLOCK_PROCESS_BIT 0x40000000 70 #define CPUCLOCK_ID_MASK (~(CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT)) 71 #define MAKE_THREAD_CPUCLOCK(tid) (CPUCLOCK_BIT|(tid)) 72 #define MAKE_PROCESS_CPUCLOCK(pid) \ 73 (CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT|(pid)) 74 75 #define NS_PER_SEC 1000000000 76 77 static struct kclock posix_clocks[MAX_CLOCKS]; 78 static uma_zone_t itimer_zone = NULL; 79 80 /* 81 * Time of day and interval timer support. 82 * 83 * These routines provide the kernel entry points to get and set 84 * the time-of-day and per-process interval timers. Subroutines 85 * here provide support for adding and subtracting timeval structures 86 * and decrementing interval timers, optionally reloading the interval 87 * timers when they expire. 88 */ 89 90 static int settime(struct thread *, struct timeval *); 91 static void timevalfix(struct timeval *); 92 static int user_clock_nanosleep(struct thread *td, clockid_t clock_id, 93 int flags, const struct timespec *ua_rqtp, 94 struct timespec *ua_rmtp); 95 96 static void itimer_start(void); 97 static int itimer_init(void *, int, int); 98 static void itimer_fini(void *, int); 99 static void itimer_enter(struct itimer *); 100 static void itimer_leave(struct itimer *); 101 static struct itimer *itimer_find(struct proc *, int); 102 static void itimers_alloc(struct proc *); 103 static int realtimer_create(struct itimer *); 104 static int realtimer_gettime(struct itimer *, struct itimerspec *); 105 static int realtimer_settime(struct itimer *, int, 106 struct itimerspec *, struct itimerspec *); 107 static int realtimer_delete(struct itimer *); 108 static void realtimer_clocktime(clockid_t, struct timespec *); 109 static void realtimer_expire(void *); 110 static void realtimer_expire_l(struct itimer *it, bool proc_locked); 111 112 static int register_posix_clock(int, const struct kclock *); 113 static void itimer_fire(struct itimer *it); 114 static int itimespecfix(struct timespec *ts); 115 116 #define CLOCK_CALL(clock, call, arglist) \ 117 ((*posix_clocks[clock].call) arglist) 118 119 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL); 120 121 static int 122 settime(struct thread *td, struct timeval *tv) 123 { 124 struct timeval delta, tv1, tv2; 125 static struct timeval maxtime, laststep; 126 struct timespec ts; 127 128 microtime(&tv1); 129 delta = *tv; 130 timevalsub(&delta, &tv1); 131 132 /* 133 * If the system is secure, we do not allow the time to be 134 * set to a value earlier than 1 second less than the highest 135 * time we have yet seen. The worst a miscreant can do in 136 * this circumstance is "freeze" time. He couldn't go 137 * back to the past. 138 * 139 * We similarly do not allow the clock to be stepped more 140 * than one second, nor more than once per second. This allows 141 * a miscreant to make the clock march double-time, but no worse. 142 */ 143 if (securelevel_gt(td->td_ucred, 1) != 0) { 144 if (delta.tv_sec < 0 || delta.tv_usec < 0) { 145 /* 146 * Update maxtime to latest time we've seen. 147 */ 148 if (tv1.tv_sec > maxtime.tv_sec) 149 maxtime = tv1; 150 tv2 = *tv; 151 timevalsub(&tv2, &maxtime); 152 if (tv2.tv_sec < -1) { 153 tv->tv_sec = maxtime.tv_sec - 1; 154 printf("Time adjustment clamped to -1 second\n"); 155 } 156 } else { 157 if (tv1.tv_sec == laststep.tv_sec) 158 return (EPERM); 159 if (delta.tv_sec > 1) { 160 tv->tv_sec = tv1.tv_sec + 1; 161 printf("Time adjustment clamped to +1 second\n"); 162 } 163 laststep = *tv; 164 } 165 } 166 167 ts.tv_sec = tv->tv_sec; 168 ts.tv_nsec = tv->tv_usec * 1000; 169 tc_setclock(&ts); 170 resettodr(); 171 return (0); 172 } 173 174 #ifndef _SYS_SYSPROTO_H_ 175 struct clock_getcpuclockid2_args { 176 id_t id; 177 int which, 178 clockid_t *clock_id; 179 }; 180 #endif 181 /* ARGSUSED */ 182 int 183 sys_clock_getcpuclockid2(struct thread *td, struct clock_getcpuclockid2_args *uap) 184 { 185 clockid_t clk_id; 186 int error; 187 188 error = kern_clock_getcpuclockid2(td, uap->id, uap->which, &clk_id); 189 if (error == 0) 190 error = copyout(&clk_id, uap->clock_id, sizeof(clockid_t)); 191 return (error); 192 } 193 194 int 195 kern_clock_getcpuclockid2(struct thread *td, id_t id, int which, 196 clockid_t *clk_id) 197 { 198 struct proc *p; 199 pid_t pid; 200 lwpid_t tid; 201 int error; 202 203 switch (which) { 204 case CPUCLOCK_WHICH_PID: 205 if (id != 0) { 206 error = pget(id, PGET_CANSEE | PGET_NOTID, &p); 207 if (error != 0) 208 return (error); 209 PROC_UNLOCK(p); 210 pid = id; 211 } else { 212 pid = td->td_proc->p_pid; 213 } 214 *clk_id = MAKE_PROCESS_CPUCLOCK(pid); 215 return (0); 216 case CPUCLOCK_WHICH_TID: 217 tid = id == 0 ? td->td_tid : id; 218 *clk_id = MAKE_THREAD_CPUCLOCK(tid); 219 return (0); 220 default: 221 return (EINVAL); 222 } 223 } 224 225 #ifndef _SYS_SYSPROTO_H_ 226 struct clock_gettime_args { 227 clockid_t clock_id; 228 struct timespec *tp; 229 }; 230 #endif 231 /* ARGSUSED */ 232 int 233 sys_clock_gettime(struct thread *td, struct clock_gettime_args *uap) 234 { 235 struct timespec ats; 236 int error; 237 238 error = kern_clock_gettime(td, uap->clock_id, &ats); 239 if (error == 0) 240 error = copyout(&ats, uap->tp, sizeof(ats)); 241 242 return (error); 243 } 244 245 static inline void 246 cputick2timespec(uint64_t runtime, struct timespec *ats) 247 { 248 runtime = cputick2usec(runtime); 249 ats->tv_sec = runtime / 1000000; 250 ats->tv_nsec = runtime % 1000000 * 1000; 251 } 252 253 void 254 kern_thread_cputime(struct thread *targettd, struct timespec *ats) 255 { 256 uint64_t runtime, curtime, switchtime; 257 258 if (targettd == NULL) { /* current thread */ 259 critical_enter(); 260 switchtime = PCPU_GET(switchtime); 261 curtime = cpu_ticks(); 262 runtime = curthread->td_runtime; 263 critical_exit(); 264 runtime += curtime - switchtime; 265 } else { 266 PROC_LOCK_ASSERT(targettd->td_proc, MA_OWNED); 267 thread_lock(targettd); 268 runtime = targettd->td_runtime; 269 thread_unlock(targettd); 270 } 271 cputick2timespec(runtime, ats); 272 } 273 274 void 275 kern_process_cputime(struct proc *targetp, struct timespec *ats) 276 { 277 uint64_t runtime; 278 struct rusage ru; 279 280 PROC_LOCK_ASSERT(targetp, MA_OWNED); 281 PROC_STATLOCK(targetp); 282 rufetch(targetp, &ru); 283 runtime = targetp->p_rux.rux_runtime; 284 if (curthread->td_proc == targetp) 285 runtime += cpu_ticks() - PCPU_GET(switchtime); 286 PROC_STATUNLOCK(targetp); 287 cputick2timespec(runtime, ats); 288 } 289 290 static int 291 get_cputime(struct thread *td, clockid_t clock_id, struct timespec *ats) 292 { 293 struct proc *p, *p2; 294 struct thread *td2; 295 lwpid_t tid; 296 pid_t pid; 297 int error; 298 299 p = td->td_proc; 300 if ((clock_id & CPUCLOCK_PROCESS_BIT) == 0) { 301 tid = clock_id & CPUCLOCK_ID_MASK; 302 td2 = tdfind(tid, p->p_pid); 303 if (td2 == NULL) 304 return (EINVAL); 305 kern_thread_cputime(td2, ats); 306 PROC_UNLOCK(td2->td_proc); 307 } else { 308 pid = clock_id & CPUCLOCK_ID_MASK; 309 error = pget(pid, PGET_CANSEE, &p2); 310 if (error != 0) 311 return (EINVAL); 312 kern_process_cputime(p2, ats); 313 PROC_UNLOCK(p2); 314 } 315 return (0); 316 } 317 318 int 319 kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats) 320 { 321 struct timeval sys, user; 322 struct proc *p; 323 324 p = td->td_proc; 325 switch (clock_id) { 326 case CLOCK_REALTIME: /* Default to precise. */ 327 case CLOCK_REALTIME_PRECISE: 328 nanotime(ats); 329 break; 330 case CLOCK_REALTIME_FAST: 331 getnanotime(ats); 332 break; 333 case CLOCK_VIRTUAL: 334 PROC_LOCK(p); 335 PROC_STATLOCK(p); 336 calcru(p, &user, &sys); 337 PROC_STATUNLOCK(p); 338 PROC_UNLOCK(p); 339 TIMEVAL_TO_TIMESPEC(&user, ats); 340 break; 341 case CLOCK_PROF: 342 PROC_LOCK(p); 343 PROC_STATLOCK(p); 344 calcru(p, &user, &sys); 345 PROC_STATUNLOCK(p); 346 PROC_UNLOCK(p); 347 timevaladd(&user, &sys); 348 TIMEVAL_TO_TIMESPEC(&user, ats); 349 break; 350 case CLOCK_MONOTONIC: /* Default to precise. */ 351 case CLOCK_MONOTONIC_PRECISE: 352 case CLOCK_UPTIME: 353 case CLOCK_UPTIME_PRECISE: 354 nanouptime(ats); 355 break; 356 case CLOCK_UPTIME_FAST: 357 case CLOCK_MONOTONIC_FAST: 358 getnanouptime(ats); 359 break; 360 case CLOCK_SECOND: 361 ats->tv_sec = time_second; 362 ats->tv_nsec = 0; 363 break; 364 case CLOCK_THREAD_CPUTIME_ID: 365 kern_thread_cputime(NULL, ats); 366 break; 367 case CLOCK_PROCESS_CPUTIME_ID: 368 PROC_LOCK(p); 369 kern_process_cputime(p, ats); 370 PROC_UNLOCK(p); 371 break; 372 default: 373 if ((int)clock_id >= 0) 374 return (EINVAL); 375 return (get_cputime(td, clock_id, ats)); 376 } 377 return (0); 378 } 379 380 #ifndef _SYS_SYSPROTO_H_ 381 struct clock_settime_args { 382 clockid_t clock_id; 383 const struct timespec *tp; 384 }; 385 #endif 386 /* ARGSUSED */ 387 int 388 sys_clock_settime(struct thread *td, struct clock_settime_args *uap) 389 { 390 struct timespec ats; 391 int error; 392 393 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0) 394 return (error); 395 return (kern_clock_settime(td, uap->clock_id, &ats)); 396 } 397 398 static int allow_insane_settime = 0; 399 SYSCTL_INT(_debug, OID_AUTO, allow_insane_settime, CTLFLAG_RWTUN, 400 &allow_insane_settime, 0, 401 "do not perform possibly restrictive checks on settime(2) args"); 402 403 int 404 kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats) 405 { 406 struct timeval atv; 407 int error; 408 409 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0) 410 return (error); 411 if (clock_id != CLOCK_REALTIME) 412 return (EINVAL); 413 if (ats->tv_nsec < 0 || ats->tv_nsec >= NS_PER_SEC || ats->tv_sec < 0) 414 return (EINVAL); 415 if (!allow_insane_settime && 416 (ats->tv_sec > 8000ULL * 365 * 24 * 60 * 60 || 417 ats->tv_sec < utc_offset())) 418 return (EINVAL); 419 /* XXX Don't convert nsec->usec and back */ 420 TIMESPEC_TO_TIMEVAL(&atv, ats); 421 error = settime(td, &atv); 422 return (error); 423 } 424 425 #ifndef _SYS_SYSPROTO_H_ 426 struct clock_getres_args { 427 clockid_t clock_id; 428 struct timespec *tp; 429 }; 430 #endif 431 int 432 sys_clock_getres(struct thread *td, struct clock_getres_args *uap) 433 { 434 struct timespec ts; 435 int error; 436 437 if (uap->tp == NULL) 438 return (0); 439 440 error = kern_clock_getres(td, uap->clock_id, &ts); 441 if (error == 0) 442 error = copyout(&ts, uap->tp, sizeof(ts)); 443 return (error); 444 } 445 446 int 447 kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts) 448 { 449 450 ts->tv_sec = 0; 451 switch (clock_id) { 452 case CLOCK_REALTIME: 453 case CLOCK_REALTIME_FAST: 454 case CLOCK_REALTIME_PRECISE: 455 case CLOCK_MONOTONIC: 456 case CLOCK_MONOTONIC_FAST: 457 case CLOCK_MONOTONIC_PRECISE: 458 case CLOCK_UPTIME: 459 case CLOCK_UPTIME_FAST: 460 case CLOCK_UPTIME_PRECISE: 461 /* 462 * Round up the result of the division cheaply by adding 1. 463 * Rounding up is especially important if rounding down 464 * would give 0. Perfect rounding is unimportant. 465 */ 466 ts->tv_nsec = NS_PER_SEC / tc_getfrequency() + 1; 467 break; 468 case CLOCK_VIRTUAL: 469 case CLOCK_PROF: 470 /* Accurately round up here because we can do so cheaply. */ 471 ts->tv_nsec = howmany(NS_PER_SEC, hz); 472 break; 473 case CLOCK_SECOND: 474 ts->tv_sec = 1; 475 ts->tv_nsec = 0; 476 break; 477 case CLOCK_THREAD_CPUTIME_ID: 478 case CLOCK_PROCESS_CPUTIME_ID: 479 cputime: 480 /* sync with cputick2usec */ 481 ts->tv_nsec = 1000000 / cpu_tickrate(); 482 if (ts->tv_nsec == 0) 483 ts->tv_nsec = 1000; 484 break; 485 default: 486 if ((int)clock_id < 0) 487 goto cputime; 488 return (EINVAL); 489 } 490 return (0); 491 } 492 493 int 494 kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt) 495 { 496 497 return (kern_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME, rqt, 498 rmt)); 499 } 500 501 static uint8_t nanowait[MAXCPU]; 502 503 int 504 kern_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags, 505 const struct timespec *rqt, struct timespec *rmt) 506 { 507 struct timespec ts, now; 508 sbintime_t sbt, sbtt, prec, tmp; 509 time_t over; 510 int error; 511 bool is_abs_real; 512 513 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= NS_PER_SEC) 514 return (EINVAL); 515 if ((flags & ~TIMER_ABSTIME) != 0) 516 return (EINVAL); 517 switch (clock_id) { 518 case CLOCK_REALTIME: 519 case CLOCK_REALTIME_PRECISE: 520 case CLOCK_REALTIME_FAST: 521 case CLOCK_SECOND: 522 is_abs_real = (flags & TIMER_ABSTIME) != 0; 523 break; 524 case CLOCK_MONOTONIC: 525 case CLOCK_MONOTONIC_PRECISE: 526 case CLOCK_MONOTONIC_FAST: 527 case CLOCK_UPTIME: 528 case CLOCK_UPTIME_PRECISE: 529 case CLOCK_UPTIME_FAST: 530 is_abs_real = false; 531 break; 532 case CLOCK_VIRTUAL: 533 case CLOCK_PROF: 534 case CLOCK_PROCESS_CPUTIME_ID: 535 return (ENOTSUP); 536 case CLOCK_THREAD_CPUTIME_ID: 537 default: 538 return (EINVAL); 539 } 540 do { 541 ts = *rqt; 542 if ((flags & TIMER_ABSTIME) != 0) { 543 if (is_abs_real) 544 td->td_rtcgen = 545 atomic_load_acq_int(&rtc_generation); 546 error = kern_clock_gettime(td, clock_id, &now); 547 KASSERT(error == 0, ("kern_clock_gettime: %d", error)); 548 timespecsub(&ts, &now, &ts); 549 } 550 if (ts.tv_sec < 0 || (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 551 error = EWOULDBLOCK; 552 break; 553 } 554 if (ts.tv_sec > INT32_MAX / 2) { 555 over = ts.tv_sec - INT32_MAX / 2; 556 ts.tv_sec -= over; 557 } else 558 over = 0; 559 tmp = tstosbt(ts); 560 prec = tmp; 561 prec >>= tc_precexp; 562 if (TIMESEL(&sbt, tmp)) 563 sbt += tc_tick_sbt; 564 sbt += tmp; 565 error = tsleep_sbt(&nanowait[curcpu], PWAIT | PCATCH, "nanslp", 566 sbt, prec, C_ABSOLUTE); 567 } while (error == 0 && is_abs_real && td->td_rtcgen == 0); 568 td->td_rtcgen = 0; 569 if (error != EWOULDBLOCK) { 570 if (TIMESEL(&sbtt, tmp)) 571 sbtt += tc_tick_sbt; 572 if (sbtt >= sbt) 573 return (0); 574 if (error == ERESTART) 575 error = EINTR; 576 if ((flags & TIMER_ABSTIME) == 0 && rmt != NULL) { 577 ts = sbttots(sbt - sbtt); 578 ts.tv_sec += over; 579 if (ts.tv_sec < 0) 580 timespecclear(&ts); 581 *rmt = ts; 582 } 583 return (error); 584 } 585 return (0); 586 } 587 588 #ifndef _SYS_SYSPROTO_H_ 589 struct nanosleep_args { 590 struct timespec *rqtp; 591 struct timespec *rmtp; 592 }; 593 #endif 594 /* ARGSUSED */ 595 int 596 sys_nanosleep(struct thread *td, struct nanosleep_args *uap) 597 { 598 599 return (user_clock_nanosleep(td, CLOCK_REALTIME, TIMER_RELTIME, 600 uap->rqtp, uap->rmtp)); 601 } 602 603 #ifndef _SYS_SYSPROTO_H_ 604 struct clock_nanosleep_args { 605 clockid_t clock_id; 606 int flags; 607 struct timespec *rqtp; 608 struct timespec *rmtp; 609 }; 610 #endif 611 /* ARGSUSED */ 612 int 613 sys_clock_nanosleep(struct thread *td, struct clock_nanosleep_args *uap) 614 { 615 int error; 616 617 error = user_clock_nanosleep(td, uap->clock_id, uap->flags, uap->rqtp, 618 uap->rmtp); 619 return (kern_posix_error(td, error)); 620 } 621 622 static int 623 user_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags, 624 const struct timespec *ua_rqtp, struct timespec *ua_rmtp) 625 { 626 struct timespec rmt, rqt; 627 int error, error2; 628 629 error = copyin(ua_rqtp, &rqt, sizeof(rqt)); 630 if (error) 631 return (error); 632 error = kern_clock_nanosleep(td, clock_id, flags, &rqt, &rmt); 633 if (error == EINTR && ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0) { 634 error2 = copyout(&rmt, ua_rmtp, sizeof(rmt)); 635 if (error2 != 0) 636 error = error2; 637 } 638 return (error); 639 } 640 641 #ifndef _SYS_SYSPROTO_H_ 642 struct gettimeofday_args { 643 struct timeval *tp; 644 struct timezone *tzp; 645 }; 646 #endif 647 /* ARGSUSED */ 648 int 649 sys_gettimeofday(struct thread *td, struct gettimeofday_args *uap) 650 { 651 struct timeval atv; 652 struct timezone rtz; 653 int error = 0; 654 655 if (uap->tp) { 656 microtime(&atv); 657 error = copyout(&atv, uap->tp, sizeof (atv)); 658 } 659 if (error == 0 && uap->tzp != NULL) { 660 rtz.tz_minuteswest = 0; 661 rtz.tz_dsttime = 0; 662 error = copyout(&rtz, uap->tzp, sizeof (rtz)); 663 } 664 return (error); 665 } 666 667 #ifndef _SYS_SYSPROTO_H_ 668 struct settimeofday_args { 669 struct timeval *tv; 670 struct timezone *tzp; 671 }; 672 #endif 673 /* ARGSUSED */ 674 int 675 sys_settimeofday(struct thread *td, struct settimeofday_args *uap) 676 { 677 struct timeval atv, *tvp; 678 struct timezone atz, *tzp; 679 int error; 680 681 if (uap->tv) { 682 error = copyin(uap->tv, &atv, sizeof(atv)); 683 if (error) 684 return (error); 685 tvp = &atv; 686 } else 687 tvp = NULL; 688 if (uap->tzp) { 689 error = copyin(uap->tzp, &atz, sizeof(atz)); 690 if (error) 691 return (error); 692 tzp = &atz; 693 } else 694 tzp = NULL; 695 return (kern_settimeofday(td, tvp, tzp)); 696 } 697 698 int 699 kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp) 700 { 701 int error; 702 703 error = priv_check(td, PRIV_SETTIMEOFDAY); 704 if (error) 705 return (error); 706 /* Verify all parameters before changing time. */ 707 if (tv) { 708 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000 || 709 tv->tv_sec < 0) 710 return (EINVAL); 711 error = settime(td, tv); 712 } 713 return (error); 714 } 715 716 /* 717 * Get value of an interval timer. The process virtual and profiling virtual 718 * time timers are kept in the p_stats area, since they can be swapped out. 719 * These are kept internally in the way they are specified externally: in 720 * time until they expire. 721 * 722 * The real time interval timer is kept in the process table slot for the 723 * process, and its value (it_value) is kept as an absolute time rather than 724 * as a delta, so that it is easy to keep periodic real-time signals from 725 * drifting. 726 * 727 * Virtual time timers are processed in the hardclock() routine of 728 * kern_clock.c. The real time timer is processed by a timeout routine, 729 * called from the softclock() routine. Since a callout may be delayed in 730 * real time due to interrupt processing in the system, it is possible for 731 * the real time timeout routine (realitexpire, given below), to be delayed 732 * in real time past when it is supposed to occur. It does not suffice, 733 * therefore, to reload the real timer .it_value from the real time timers 734 * .it_interval. Rather, we compute the next time in absolute time the timer 735 * should go off. 736 */ 737 #ifndef _SYS_SYSPROTO_H_ 738 struct getitimer_args { 739 u_int which; 740 struct itimerval *itv; 741 }; 742 #endif 743 int 744 sys_getitimer(struct thread *td, struct getitimer_args *uap) 745 { 746 struct itimerval aitv; 747 int error; 748 749 error = kern_getitimer(td, uap->which, &aitv); 750 if (error != 0) 751 return (error); 752 return (copyout(&aitv, uap->itv, sizeof (struct itimerval))); 753 } 754 755 int 756 kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv) 757 { 758 struct proc *p = td->td_proc; 759 struct timeval ctv; 760 761 if (which > ITIMER_PROF) 762 return (EINVAL); 763 764 if (which == ITIMER_REAL) { 765 /* 766 * Convert from absolute to relative time in .it_value 767 * part of real time timer. If time for real time timer 768 * has passed return 0, else return difference between 769 * current time and time for the timer to go off. 770 */ 771 PROC_LOCK(p); 772 *aitv = p->p_realtimer; 773 PROC_UNLOCK(p); 774 if (timevalisset(&aitv->it_value)) { 775 microuptime(&ctv); 776 if (timevalcmp(&aitv->it_value, &ctv, <)) 777 timevalclear(&aitv->it_value); 778 else 779 timevalsub(&aitv->it_value, &ctv); 780 } 781 } else { 782 PROC_ITIMLOCK(p); 783 *aitv = p->p_stats->p_timer[which]; 784 PROC_ITIMUNLOCK(p); 785 } 786 #ifdef KTRACE 787 if (KTRPOINT(td, KTR_STRUCT)) 788 ktritimerval(aitv); 789 #endif 790 return (0); 791 } 792 793 #ifndef _SYS_SYSPROTO_H_ 794 struct setitimer_args { 795 u_int which; 796 struct itimerval *itv, *oitv; 797 }; 798 #endif 799 int 800 sys_setitimer(struct thread *td, struct setitimer_args *uap) 801 { 802 struct itimerval aitv, oitv; 803 int error; 804 805 if (uap->itv == NULL) { 806 uap->itv = uap->oitv; 807 return (sys_getitimer(td, (struct getitimer_args *)uap)); 808 } 809 810 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval)))) 811 return (error); 812 error = kern_setitimer(td, uap->which, &aitv, &oitv); 813 if (error != 0 || uap->oitv == NULL) 814 return (error); 815 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval))); 816 } 817 818 int 819 kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv, 820 struct itimerval *oitv) 821 { 822 struct proc *p = td->td_proc; 823 struct timeval ctv; 824 sbintime_t sbt, pr; 825 826 if (aitv == NULL) 827 return (kern_getitimer(td, which, oitv)); 828 829 if (which > ITIMER_PROF) 830 return (EINVAL); 831 #ifdef KTRACE 832 if (KTRPOINT(td, KTR_STRUCT)) 833 ktritimerval(aitv); 834 #endif 835 if (itimerfix(&aitv->it_value) || 836 aitv->it_value.tv_sec > INT32_MAX / 2) 837 return (EINVAL); 838 if (!timevalisset(&aitv->it_value)) 839 timevalclear(&aitv->it_interval); 840 else if (itimerfix(&aitv->it_interval) || 841 aitv->it_interval.tv_sec > INT32_MAX / 2) 842 return (EINVAL); 843 844 if (which == ITIMER_REAL) { 845 PROC_LOCK(p); 846 if (timevalisset(&p->p_realtimer.it_value)) 847 callout_stop(&p->p_itcallout); 848 microuptime(&ctv); 849 if (timevalisset(&aitv->it_value)) { 850 pr = tvtosbt(aitv->it_value) >> tc_precexp; 851 timevaladd(&aitv->it_value, &ctv); 852 sbt = tvtosbt(aitv->it_value); 853 callout_reset_sbt(&p->p_itcallout, sbt, pr, 854 realitexpire, p, C_ABSOLUTE); 855 } 856 *oitv = p->p_realtimer; 857 p->p_realtimer = *aitv; 858 PROC_UNLOCK(p); 859 if (timevalisset(&oitv->it_value)) { 860 if (timevalcmp(&oitv->it_value, &ctv, <)) 861 timevalclear(&oitv->it_value); 862 else 863 timevalsub(&oitv->it_value, &ctv); 864 } 865 } else { 866 if (aitv->it_interval.tv_sec == 0 && 867 aitv->it_interval.tv_usec != 0 && 868 aitv->it_interval.tv_usec < tick) 869 aitv->it_interval.tv_usec = tick; 870 if (aitv->it_value.tv_sec == 0 && 871 aitv->it_value.tv_usec != 0 && 872 aitv->it_value.tv_usec < tick) 873 aitv->it_value.tv_usec = tick; 874 PROC_ITIMLOCK(p); 875 *oitv = p->p_stats->p_timer[which]; 876 p->p_stats->p_timer[which] = *aitv; 877 PROC_ITIMUNLOCK(p); 878 } 879 #ifdef KTRACE 880 if (KTRPOINT(td, KTR_STRUCT)) 881 ktritimerval(oitv); 882 #endif 883 return (0); 884 } 885 886 static void 887 realitexpire_reset_callout(struct proc *p, sbintime_t *isbtp) 888 { 889 sbintime_t prec; 890 891 prec = isbtp == NULL ? tvtosbt(p->p_realtimer.it_interval) : *isbtp; 892 callout_reset_sbt(&p->p_itcallout, tvtosbt(p->p_realtimer.it_value), 893 prec >> tc_precexp, realitexpire, p, C_ABSOLUTE); 894 } 895 896 void 897 itimer_proc_continue(struct proc *p) 898 { 899 struct timeval ctv; 900 struct itimer *it; 901 int id; 902 903 PROC_LOCK_ASSERT(p, MA_OWNED); 904 905 if ((p->p_flag2 & P2_ITSTOPPED) != 0) { 906 p->p_flag2 &= ~P2_ITSTOPPED; 907 microuptime(&ctv); 908 if (timevalcmp(&p->p_realtimer.it_value, &ctv, >=)) 909 realitexpire(p); 910 else 911 realitexpire_reset_callout(p, NULL); 912 } 913 914 if (p->p_itimers != NULL) { 915 for (id = 3; id < TIMER_MAX; id++) { 916 it = p->p_itimers->its_timers[id]; 917 if (it == NULL) 918 continue; 919 if ((it->it_flags & ITF_PSTOPPED) != 0) { 920 ITIMER_LOCK(it); 921 if ((it->it_flags & ITF_PSTOPPED) != 0) { 922 it->it_flags &= ~ITF_PSTOPPED; 923 if ((it->it_flags & ITF_DELETING) == 0) 924 realtimer_expire_l(it, true); 925 } 926 ITIMER_UNLOCK(it); 927 } 928 } 929 } 930 } 931 932 /* 933 * Real interval timer expired: 934 * send process whose timer expired an alarm signal. 935 * If time is not set up to reload, then just return. 936 * Else compute next time timer should go off which is > current time. 937 * This is where delay in processing this timeout causes multiple 938 * SIGALRM calls to be compressed into one. 939 * tvtohz() always adds 1 to allow for the time until the next clock 940 * interrupt being strictly less than 1 clock tick, but we don't want 941 * that here since we want to appear to be in sync with the clock 942 * interrupt even when we're delayed. 943 */ 944 void 945 realitexpire(void *arg) 946 { 947 struct proc *p; 948 struct timeval ctv; 949 sbintime_t isbt; 950 951 p = (struct proc *)arg; 952 kern_psignal(p, SIGALRM); 953 if (!timevalisset(&p->p_realtimer.it_interval)) { 954 timevalclear(&p->p_realtimer.it_value); 955 if (p->p_flag & P_WEXIT) 956 wakeup(&p->p_itcallout); 957 return; 958 } 959 960 isbt = tvtosbt(p->p_realtimer.it_interval); 961 if (isbt >= sbt_timethreshold) 962 getmicrouptime(&ctv); 963 else 964 microuptime(&ctv); 965 do { 966 timevaladd(&p->p_realtimer.it_value, 967 &p->p_realtimer.it_interval); 968 } while (timevalcmp(&p->p_realtimer.it_value, &ctv, <=)); 969 970 if (P_SHOULDSTOP(p) || P_KILLED(p)) { 971 p->p_flag2 |= P2_ITSTOPPED; 972 return; 973 } 974 975 p->p_flag2 &= ~P2_ITSTOPPED; 976 realitexpire_reset_callout(p, &isbt); 977 } 978 979 /* 980 * Check that a proposed value to load into the .it_value or 981 * .it_interval part of an interval timer is acceptable, and 982 * fix it to have at least minimal value (i.e. if it is less 983 * than the resolution of the clock, round it up.) 984 */ 985 int 986 itimerfix(struct timeval *tv) 987 { 988 989 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000) 990 return (EINVAL); 991 if (tv->tv_sec == 0 && tv->tv_usec != 0 && 992 tv->tv_usec < (u_int)tick / 16) 993 tv->tv_usec = (u_int)tick / 16; 994 return (0); 995 } 996 997 /* 998 * Decrement an interval timer by a specified number 999 * of microseconds, which must be less than a second, 1000 * i.e. < 1000000. If the timer expires, then reload 1001 * it. In this case, carry over (usec - old value) to 1002 * reduce the value reloaded into the timer so that 1003 * the timer does not drift. This routine assumes 1004 * that it is called in a context where the timers 1005 * on which it is operating cannot change in value. 1006 */ 1007 int 1008 itimerdecr(struct itimerval *itp, int usec) 1009 { 1010 1011 if (itp->it_value.tv_usec < usec) { 1012 if (itp->it_value.tv_sec == 0) { 1013 /* expired, and already in next interval */ 1014 usec -= itp->it_value.tv_usec; 1015 goto expire; 1016 } 1017 itp->it_value.tv_usec += 1000000; 1018 itp->it_value.tv_sec--; 1019 } 1020 itp->it_value.tv_usec -= usec; 1021 usec = 0; 1022 if (timevalisset(&itp->it_value)) 1023 return (1); 1024 /* expired, exactly at end of interval */ 1025 expire: 1026 if (timevalisset(&itp->it_interval)) { 1027 itp->it_value = itp->it_interval; 1028 itp->it_value.tv_usec -= usec; 1029 if (itp->it_value.tv_usec < 0) { 1030 itp->it_value.tv_usec += 1000000; 1031 itp->it_value.tv_sec--; 1032 } 1033 } else 1034 itp->it_value.tv_usec = 0; /* sec is already 0 */ 1035 return (0); 1036 } 1037 1038 /* 1039 * Add and subtract routines for timevals. 1040 * N.B.: subtract routine doesn't deal with 1041 * results which are before the beginning, 1042 * it just gets very confused in this case. 1043 * Caveat emptor. 1044 */ 1045 void 1046 timevaladd(struct timeval *t1, const struct timeval *t2) 1047 { 1048 1049 t1->tv_sec += t2->tv_sec; 1050 t1->tv_usec += t2->tv_usec; 1051 timevalfix(t1); 1052 } 1053 1054 void 1055 timevalsub(struct timeval *t1, const struct timeval *t2) 1056 { 1057 1058 t1->tv_sec -= t2->tv_sec; 1059 t1->tv_usec -= t2->tv_usec; 1060 timevalfix(t1); 1061 } 1062 1063 static void 1064 timevalfix(struct timeval *t1) 1065 { 1066 1067 if (t1->tv_usec < 0) { 1068 t1->tv_sec--; 1069 t1->tv_usec += 1000000; 1070 } 1071 if (t1->tv_usec >= 1000000) { 1072 t1->tv_sec++; 1073 t1->tv_usec -= 1000000; 1074 } 1075 } 1076 1077 /* 1078 * ratecheck(): simple time-based rate-limit checking. 1079 */ 1080 int 1081 ratecheck(struct timeval *lasttime, const struct timeval *mininterval) 1082 { 1083 struct timeval tv, delta; 1084 int rv = 0; 1085 1086 getmicrouptime(&tv); /* NB: 10ms precision */ 1087 delta = tv; 1088 timevalsub(&delta, lasttime); 1089 1090 /* 1091 * check for 0,0 is so that the message will be seen at least once, 1092 * even if interval is huge. 1093 */ 1094 if (timevalcmp(&delta, mininterval, >=) || 1095 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) { 1096 *lasttime = tv; 1097 rv = 1; 1098 } 1099 1100 return (rv); 1101 } 1102 1103 /* 1104 * ppsratecheck(): packets (or events) per second limitation. 1105 * 1106 * Return 0 if the limit is to be enforced (e.g. the caller 1107 * should drop a packet because of the rate limitation). 1108 * 1109 * maxpps of 0 always causes zero to be returned. maxpps of -1 1110 * always causes 1 to be returned; this effectively defeats rate 1111 * limiting. 1112 * 1113 * Note that we maintain the struct timeval for compatibility 1114 * with other bsd systems. We reuse the storage and just monitor 1115 * clock ticks for minimal overhead. 1116 */ 1117 int 1118 ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps) 1119 { 1120 int now; 1121 1122 /* 1123 * Reset the last time and counter if this is the first call 1124 * or more than a second has passed since the last update of 1125 * lasttime. 1126 */ 1127 now = ticks; 1128 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) { 1129 lasttime->tv_sec = now; 1130 *curpps = 1; 1131 return (maxpps != 0); 1132 } else { 1133 (*curpps)++; /* NB: ignore potential overflow */ 1134 return (maxpps < 0 || *curpps <= maxpps); 1135 } 1136 } 1137 1138 static void 1139 itimer_start(void) 1140 { 1141 static const struct kclock rt_clock = { 1142 .timer_create = realtimer_create, 1143 .timer_delete = realtimer_delete, 1144 .timer_settime = realtimer_settime, 1145 .timer_gettime = realtimer_gettime, 1146 }; 1147 1148 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer), 1149 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0); 1150 register_posix_clock(CLOCK_REALTIME, &rt_clock); 1151 register_posix_clock(CLOCK_MONOTONIC, &rt_clock); 1152 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L); 1153 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX); 1154 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX); 1155 } 1156 1157 static int 1158 register_posix_clock(int clockid, const struct kclock *clk) 1159 { 1160 if ((unsigned)clockid >= MAX_CLOCKS) { 1161 printf("%s: invalid clockid\n", __func__); 1162 return (0); 1163 } 1164 posix_clocks[clockid] = *clk; 1165 return (1); 1166 } 1167 1168 static int 1169 itimer_init(void *mem, int size, int flags) 1170 { 1171 struct itimer *it; 1172 1173 it = (struct itimer *)mem; 1174 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF); 1175 return (0); 1176 } 1177 1178 static void 1179 itimer_fini(void *mem, int size) 1180 { 1181 struct itimer *it; 1182 1183 it = (struct itimer *)mem; 1184 mtx_destroy(&it->it_mtx); 1185 } 1186 1187 static void 1188 itimer_enter(struct itimer *it) 1189 { 1190 1191 mtx_assert(&it->it_mtx, MA_OWNED); 1192 it->it_usecount++; 1193 } 1194 1195 static void 1196 itimer_leave(struct itimer *it) 1197 { 1198 1199 mtx_assert(&it->it_mtx, MA_OWNED); 1200 KASSERT(it->it_usecount > 0, ("invalid it_usecount")); 1201 1202 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0) 1203 wakeup(it); 1204 } 1205 1206 #ifndef _SYS_SYSPROTO_H_ 1207 struct ktimer_create_args { 1208 clockid_t clock_id; 1209 struct sigevent * evp; 1210 int * timerid; 1211 }; 1212 #endif 1213 int 1214 sys_ktimer_create(struct thread *td, struct ktimer_create_args *uap) 1215 { 1216 struct sigevent *evp, ev; 1217 int id; 1218 int error; 1219 1220 if (uap->evp == NULL) { 1221 evp = NULL; 1222 } else { 1223 error = copyin(uap->evp, &ev, sizeof(ev)); 1224 if (error != 0) 1225 return (error); 1226 evp = &ev; 1227 } 1228 error = kern_ktimer_create(td, uap->clock_id, evp, &id, -1); 1229 if (error == 0) { 1230 error = copyout(&id, uap->timerid, sizeof(int)); 1231 if (error != 0) 1232 kern_ktimer_delete(td, id); 1233 } 1234 return (error); 1235 } 1236 1237 int 1238 kern_ktimer_create(struct thread *td, clockid_t clock_id, struct sigevent *evp, 1239 int *timerid, int preset_id) 1240 { 1241 struct proc *p = td->td_proc; 1242 struct itimer *it; 1243 int id; 1244 int error; 1245 1246 if (clock_id < 0 || clock_id >= MAX_CLOCKS) 1247 return (EINVAL); 1248 1249 if (posix_clocks[clock_id].timer_create == NULL) 1250 return (EINVAL); 1251 1252 if (evp != NULL) { 1253 if (evp->sigev_notify != SIGEV_NONE && 1254 evp->sigev_notify != SIGEV_SIGNAL && 1255 evp->sigev_notify != SIGEV_THREAD_ID) 1256 return (EINVAL); 1257 if ((evp->sigev_notify == SIGEV_SIGNAL || 1258 evp->sigev_notify == SIGEV_THREAD_ID) && 1259 !_SIG_VALID(evp->sigev_signo)) 1260 return (EINVAL); 1261 } 1262 1263 if (p->p_itimers == NULL) 1264 itimers_alloc(p); 1265 1266 it = uma_zalloc(itimer_zone, M_WAITOK); 1267 it->it_flags = 0; 1268 it->it_usecount = 0; 1269 it->it_active = 0; 1270 timespecclear(&it->it_time.it_value); 1271 timespecclear(&it->it_time.it_interval); 1272 it->it_overrun = 0; 1273 it->it_overrun_last = 0; 1274 it->it_clockid = clock_id; 1275 it->it_timerid = -1; 1276 it->it_proc = p; 1277 ksiginfo_init(&it->it_ksi); 1278 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT; 1279 error = CLOCK_CALL(clock_id, timer_create, (it)); 1280 if (error != 0) 1281 goto out; 1282 1283 PROC_LOCK(p); 1284 if (preset_id != -1) { 1285 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id")); 1286 id = preset_id; 1287 if (p->p_itimers->its_timers[id] != NULL) { 1288 PROC_UNLOCK(p); 1289 error = 0; 1290 goto out; 1291 } 1292 } else { 1293 /* 1294 * Find a free timer slot, skipping those reserved 1295 * for setitimer(). 1296 */ 1297 for (id = 3; id < TIMER_MAX; id++) 1298 if (p->p_itimers->its_timers[id] == NULL) 1299 break; 1300 if (id == TIMER_MAX) { 1301 PROC_UNLOCK(p); 1302 error = EAGAIN; 1303 goto out; 1304 } 1305 } 1306 it->it_timerid = id; 1307 p->p_itimers->its_timers[id] = it; 1308 if (evp != NULL) 1309 it->it_sigev = *evp; 1310 else { 1311 it->it_sigev.sigev_notify = SIGEV_SIGNAL; 1312 switch (clock_id) { 1313 default: 1314 case CLOCK_REALTIME: 1315 it->it_sigev.sigev_signo = SIGALRM; 1316 break; 1317 case CLOCK_VIRTUAL: 1318 it->it_sigev.sigev_signo = SIGVTALRM; 1319 break; 1320 case CLOCK_PROF: 1321 it->it_sigev.sigev_signo = SIGPROF; 1322 break; 1323 } 1324 it->it_sigev.sigev_value.sival_int = id; 1325 } 1326 1327 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || 1328 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { 1329 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo; 1330 it->it_ksi.ksi_code = SI_TIMER; 1331 it->it_ksi.ksi_value = it->it_sigev.sigev_value; 1332 it->it_ksi.ksi_timerid = id; 1333 } 1334 PROC_UNLOCK(p); 1335 *timerid = id; 1336 return (0); 1337 1338 out: 1339 ITIMER_LOCK(it); 1340 CLOCK_CALL(it->it_clockid, timer_delete, (it)); 1341 ITIMER_UNLOCK(it); 1342 uma_zfree(itimer_zone, it); 1343 return (error); 1344 } 1345 1346 #ifndef _SYS_SYSPROTO_H_ 1347 struct ktimer_delete_args { 1348 int timerid; 1349 }; 1350 #endif 1351 int 1352 sys_ktimer_delete(struct thread *td, struct ktimer_delete_args *uap) 1353 { 1354 1355 return (kern_ktimer_delete(td, uap->timerid)); 1356 } 1357 1358 static struct itimer * 1359 itimer_find(struct proc *p, int timerid) 1360 { 1361 struct itimer *it; 1362 1363 PROC_LOCK_ASSERT(p, MA_OWNED); 1364 if ((p->p_itimers == NULL) || 1365 (timerid < 0) || (timerid >= TIMER_MAX) || 1366 (it = p->p_itimers->its_timers[timerid]) == NULL) { 1367 return (NULL); 1368 } 1369 ITIMER_LOCK(it); 1370 if ((it->it_flags & ITF_DELETING) != 0) { 1371 ITIMER_UNLOCK(it); 1372 it = NULL; 1373 } 1374 return (it); 1375 } 1376 1377 int 1378 kern_ktimer_delete(struct thread *td, int timerid) 1379 { 1380 struct proc *p = td->td_proc; 1381 struct itimer *it; 1382 1383 PROC_LOCK(p); 1384 it = itimer_find(p, timerid); 1385 if (it == NULL) { 1386 PROC_UNLOCK(p); 1387 return (EINVAL); 1388 } 1389 PROC_UNLOCK(p); 1390 1391 it->it_flags |= ITF_DELETING; 1392 while (it->it_usecount > 0) { 1393 it->it_flags |= ITF_WANTED; 1394 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0); 1395 } 1396 it->it_flags &= ~ITF_WANTED; 1397 CLOCK_CALL(it->it_clockid, timer_delete, (it)); 1398 ITIMER_UNLOCK(it); 1399 1400 PROC_LOCK(p); 1401 if (KSI_ONQ(&it->it_ksi)) 1402 sigqueue_take(&it->it_ksi); 1403 p->p_itimers->its_timers[timerid] = NULL; 1404 PROC_UNLOCK(p); 1405 uma_zfree(itimer_zone, it); 1406 return (0); 1407 } 1408 1409 #ifndef _SYS_SYSPROTO_H_ 1410 struct ktimer_settime_args { 1411 int timerid; 1412 int flags; 1413 const struct itimerspec * value; 1414 struct itimerspec * ovalue; 1415 }; 1416 #endif 1417 int 1418 sys_ktimer_settime(struct thread *td, struct ktimer_settime_args *uap) 1419 { 1420 struct itimerspec val, oval, *ovalp; 1421 int error; 1422 1423 error = copyin(uap->value, &val, sizeof(val)); 1424 if (error != 0) 1425 return (error); 1426 ovalp = uap->ovalue != NULL ? &oval : NULL; 1427 error = kern_ktimer_settime(td, uap->timerid, uap->flags, &val, ovalp); 1428 if (error == 0 && uap->ovalue != NULL) 1429 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp)); 1430 return (error); 1431 } 1432 1433 int 1434 kern_ktimer_settime(struct thread *td, int timer_id, int flags, 1435 struct itimerspec *val, struct itimerspec *oval) 1436 { 1437 struct proc *p; 1438 struct itimer *it; 1439 int error; 1440 1441 p = td->td_proc; 1442 PROC_LOCK(p); 1443 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) { 1444 PROC_UNLOCK(p); 1445 error = EINVAL; 1446 } else { 1447 PROC_UNLOCK(p); 1448 itimer_enter(it); 1449 error = CLOCK_CALL(it->it_clockid, timer_settime, (it, 1450 flags, val, oval)); 1451 itimer_leave(it); 1452 ITIMER_UNLOCK(it); 1453 } 1454 return (error); 1455 } 1456 1457 #ifndef _SYS_SYSPROTO_H_ 1458 struct ktimer_gettime_args { 1459 int timerid; 1460 struct itimerspec * value; 1461 }; 1462 #endif 1463 int 1464 sys_ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap) 1465 { 1466 struct itimerspec val; 1467 int error; 1468 1469 error = kern_ktimer_gettime(td, uap->timerid, &val); 1470 if (error == 0) 1471 error = copyout(&val, uap->value, sizeof(val)); 1472 return (error); 1473 } 1474 1475 int 1476 kern_ktimer_gettime(struct thread *td, int timer_id, struct itimerspec *val) 1477 { 1478 struct proc *p; 1479 struct itimer *it; 1480 int error; 1481 1482 p = td->td_proc; 1483 PROC_LOCK(p); 1484 if (timer_id < 3 || (it = itimer_find(p, timer_id)) == NULL) { 1485 PROC_UNLOCK(p); 1486 error = EINVAL; 1487 } else { 1488 PROC_UNLOCK(p); 1489 itimer_enter(it); 1490 error = CLOCK_CALL(it->it_clockid, timer_gettime, (it, val)); 1491 itimer_leave(it); 1492 ITIMER_UNLOCK(it); 1493 } 1494 return (error); 1495 } 1496 1497 #ifndef _SYS_SYSPROTO_H_ 1498 struct timer_getoverrun_args { 1499 int timerid; 1500 }; 1501 #endif 1502 int 1503 sys_ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap) 1504 { 1505 1506 return (kern_ktimer_getoverrun(td, uap->timerid)); 1507 } 1508 1509 int 1510 kern_ktimer_getoverrun(struct thread *td, int timer_id) 1511 { 1512 struct proc *p = td->td_proc; 1513 struct itimer *it; 1514 int error ; 1515 1516 PROC_LOCK(p); 1517 if (timer_id < 3 || 1518 (it = itimer_find(p, timer_id)) == NULL) { 1519 PROC_UNLOCK(p); 1520 error = EINVAL; 1521 } else { 1522 td->td_retval[0] = it->it_overrun_last; 1523 ITIMER_UNLOCK(it); 1524 PROC_UNLOCK(p); 1525 error = 0; 1526 } 1527 return (error); 1528 } 1529 1530 static int 1531 realtimer_create(struct itimer *it) 1532 { 1533 callout_init_mtx(&it->it_callout, &it->it_mtx, 0); 1534 return (0); 1535 } 1536 1537 static int 1538 realtimer_delete(struct itimer *it) 1539 { 1540 mtx_assert(&it->it_mtx, MA_OWNED); 1541 1542 /* 1543 * clear timer's value and interval to tell realtimer_expire 1544 * to not rearm the timer. 1545 */ 1546 timespecclear(&it->it_time.it_value); 1547 timespecclear(&it->it_time.it_interval); 1548 ITIMER_UNLOCK(it); 1549 callout_drain(&it->it_callout); 1550 ITIMER_LOCK(it); 1551 return (0); 1552 } 1553 1554 static int 1555 realtimer_gettime(struct itimer *it, struct itimerspec *ovalue) 1556 { 1557 struct timespec cts; 1558 1559 mtx_assert(&it->it_mtx, MA_OWNED); 1560 1561 realtimer_clocktime(it->it_clockid, &cts); 1562 *ovalue = it->it_time; 1563 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) { 1564 timespecsub(&ovalue->it_value, &cts, &ovalue->it_value); 1565 if (ovalue->it_value.tv_sec < 0 || 1566 (ovalue->it_value.tv_sec == 0 && 1567 ovalue->it_value.tv_nsec == 0)) { 1568 ovalue->it_value.tv_sec = 0; 1569 ovalue->it_value.tv_nsec = 1; 1570 } 1571 } 1572 return (0); 1573 } 1574 1575 static int 1576 realtimer_settime(struct itimer *it, int flags, struct itimerspec *value, 1577 struct itimerspec *ovalue) 1578 { 1579 struct timespec cts, ts; 1580 struct timeval tv; 1581 struct itimerspec val; 1582 1583 mtx_assert(&it->it_mtx, MA_OWNED); 1584 1585 val = *value; 1586 if (itimespecfix(&val.it_value)) 1587 return (EINVAL); 1588 1589 if (timespecisset(&val.it_value)) { 1590 if (itimespecfix(&val.it_interval)) 1591 return (EINVAL); 1592 } else { 1593 timespecclear(&val.it_interval); 1594 } 1595 1596 if (ovalue != NULL) 1597 realtimer_gettime(it, ovalue); 1598 1599 it->it_time = val; 1600 if (timespecisset(&val.it_value)) { 1601 realtimer_clocktime(it->it_clockid, &cts); 1602 ts = val.it_value; 1603 if ((flags & TIMER_ABSTIME) == 0) { 1604 /* Convert to absolute time. */ 1605 timespecadd(&it->it_time.it_value, &cts, 1606 &it->it_time.it_value); 1607 } else { 1608 timespecsub(&ts, &cts, &ts); 1609 /* 1610 * We don't care if ts is negative, tztohz will 1611 * fix it. 1612 */ 1613 } 1614 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1615 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire, 1616 it); 1617 } else { 1618 callout_stop(&it->it_callout); 1619 } 1620 1621 return (0); 1622 } 1623 1624 static void 1625 realtimer_clocktime(clockid_t id, struct timespec *ts) 1626 { 1627 if (id == CLOCK_REALTIME) 1628 getnanotime(ts); 1629 else /* CLOCK_MONOTONIC */ 1630 getnanouptime(ts); 1631 } 1632 1633 int 1634 itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi) 1635 { 1636 struct itimer *it; 1637 1638 PROC_LOCK_ASSERT(p, MA_OWNED); 1639 it = itimer_find(p, timerid); 1640 if (it != NULL) { 1641 ksi->ksi_overrun = it->it_overrun; 1642 it->it_overrun_last = it->it_overrun; 1643 it->it_overrun = 0; 1644 ITIMER_UNLOCK(it); 1645 return (0); 1646 } 1647 return (EINVAL); 1648 } 1649 1650 static int 1651 itimespecfix(struct timespec *ts) 1652 { 1653 1654 if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= NS_PER_SEC) 1655 return (EINVAL); 1656 if ((UINT64_MAX - ts->tv_nsec) / NS_PER_SEC < ts->tv_sec) 1657 return (EINVAL); 1658 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000) 1659 ts->tv_nsec = tick * 1000; 1660 return (0); 1661 } 1662 1663 #define timespectons(tsp) \ 1664 ((uint64_t)(tsp)->tv_sec * NS_PER_SEC + (tsp)->tv_nsec) 1665 #define timespecfromns(ns) (struct timespec){ \ 1666 .tv_sec = (ns) / NS_PER_SEC, \ 1667 .tv_nsec = (ns) % NS_PER_SEC \ 1668 } 1669 1670 static void 1671 realtimer_expire_l(struct itimer *it, bool proc_locked) 1672 { 1673 struct timespec cts, ts; 1674 struct timeval tv; 1675 struct proc *p; 1676 uint64_t interval, now, overruns, value; 1677 1678 realtimer_clocktime(it->it_clockid, &cts); 1679 /* Only fire if time is reached. */ 1680 if (timespeccmp(&cts, &it->it_time.it_value, >=)) { 1681 if (timespecisset(&it->it_time.it_interval)) { 1682 timespecadd(&it->it_time.it_value, 1683 &it->it_time.it_interval, 1684 &it->it_time.it_value); 1685 1686 interval = timespectons(&it->it_time.it_interval); 1687 value = timespectons(&it->it_time.it_value); 1688 now = timespectons(&cts); 1689 1690 if (now >= value) { 1691 /* 1692 * We missed at least one period. 1693 */ 1694 overruns = howmany(now - value + 1, interval); 1695 if (it->it_overrun + overruns >= 1696 it->it_overrun && 1697 it->it_overrun + overruns <= INT_MAX) { 1698 it->it_overrun += (int)overruns; 1699 } else { 1700 it->it_overrun = INT_MAX; 1701 it->it_ksi.ksi_errno = ERANGE; 1702 } 1703 value = 1704 now + interval - (now - value) % interval; 1705 it->it_time.it_value = timespecfromns(value); 1706 } 1707 } else { 1708 /* single shot timer ? */ 1709 timespecclear(&it->it_time.it_value); 1710 } 1711 1712 p = it->it_proc; 1713 if (timespecisset(&it->it_time.it_value)) { 1714 if (P_SHOULDSTOP(p) || P_KILLED(p)) { 1715 it->it_flags |= ITF_PSTOPPED; 1716 } else { 1717 timespecsub(&it->it_time.it_value, &cts, &ts); 1718 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1719 callout_reset(&it->it_callout, tvtohz(&tv), 1720 realtimer_expire, it); 1721 } 1722 } 1723 1724 itimer_enter(it); 1725 ITIMER_UNLOCK(it); 1726 if (proc_locked) 1727 PROC_UNLOCK(p); 1728 itimer_fire(it); 1729 if (proc_locked) 1730 PROC_LOCK(p); 1731 ITIMER_LOCK(it); 1732 itimer_leave(it); 1733 } else if (timespecisset(&it->it_time.it_value)) { 1734 p = it->it_proc; 1735 if (P_SHOULDSTOP(p) || P_KILLED(p)) { 1736 it->it_flags |= ITF_PSTOPPED; 1737 } else { 1738 ts = it->it_time.it_value; 1739 timespecsub(&ts, &cts, &ts); 1740 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1741 callout_reset(&it->it_callout, tvtohz(&tv), 1742 realtimer_expire, it); 1743 } 1744 } 1745 } 1746 1747 /* Timeout callback for realtime timer */ 1748 static void 1749 realtimer_expire(void *arg) 1750 { 1751 realtimer_expire_l(arg, false); 1752 } 1753 1754 static void 1755 itimer_fire(struct itimer *it) 1756 { 1757 struct proc *p = it->it_proc; 1758 struct thread *td; 1759 1760 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || 1761 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { 1762 if (sigev_findtd(p, &it->it_sigev, &td) != 0) { 1763 ITIMER_LOCK(it); 1764 timespecclear(&it->it_time.it_value); 1765 timespecclear(&it->it_time.it_interval); 1766 callout_stop(&it->it_callout); 1767 ITIMER_UNLOCK(it); 1768 return; 1769 } 1770 if (!KSI_ONQ(&it->it_ksi)) { 1771 it->it_ksi.ksi_errno = 0; 1772 ksiginfo_set_sigev(&it->it_ksi, &it->it_sigev); 1773 tdsendsignal(p, td, it->it_ksi.ksi_signo, &it->it_ksi); 1774 } else { 1775 if (it->it_overrun < INT_MAX) 1776 it->it_overrun++; 1777 else 1778 it->it_ksi.ksi_errno = ERANGE; 1779 } 1780 PROC_UNLOCK(p); 1781 } 1782 } 1783 1784 static void 1785 itimers_alloc(struct proc *p) 1786 { 1787 struct itimers *its; 1788 int i; 1789 1790 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO); 1791 LIST_INIT(&its->its_virtual); 1792 LIST_INIT(&its->its_prof); 1793 TAILQ_INIT(&its->its_worklist); 1794 for (i = 0; i < TIMER_MAX; i++) 1795 its->its_timers[i] = NULL; 1796 PROC_LOCK(p); 1797 if (p->p_itimers == NULL) { 1798 p->p_itimers = its; 1799 PROC_UNLOCK(p); 1800 } 1801 else { 1802 PROC_UNLOCK(p); 1803 free(its, M_SUBPROC); 1804 } 1805 } 1806 1807 /* Clean up timers when some process events are being triggered. */ 1808 static void 1809 itimers_event_exit_exec(int start_idx, struct proc *p) 1810 { 1811 struct itimers *its; 1812 struct itimer *it; 1813 int i; 1814 1815 its = p->p_itimers; 1816 if (its == NULL) 1817 return; 1818 1819 for (i = start_idx; i < TIMER_MAX; ++i) { 1820 if ((it = its->its_timers[i]) != NULL) 1821 kern_ktimer_delete(curthread, i); 1822 } 1823 if (its->its_timers[0] == NULL && its->its_timers[1] == NULL && 1824 its->its_timers[2] == NULL) { 1825 /* Synchronize with itimer_proc_continue(). */ 1826 PROC_LOCK(p); 1827 p->p_itimers = NULL; 1828 PROC_UNLOCK(p); 1829 free(its, M_SUBPROC); 1830 } 1831 } 1832 1833 void 1834 itimers_exec(struct proc *p) 1835 { 1836 /* 1837 * According to susv3, XSI interval timers should be inherited 1838 * by new image. 1839 */ 1840 itimers_event_exit_exec(3, p); 1841 } 1842 1843 void 1844 itimers_exit(struct proc *p) 1845 { 1846 itimers_event_exit_exec(0, p); 1847 }
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