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