kern_time.c revision 1.179.8.4
1 /* $NetBSD: kern_time.c,v 1.179.8.4 2018/12/27 12:00:10 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2000, 2004, 2005, 2007, 2008, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christopher G. Demetriou, and by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)kern_time.c 8.4 (Berkeley) 5/26/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: kern_time.c,v 1.179.8.4 2018/12/27 12:00:10 martin Exp $"); 65 66 #include <sys/param.h> 67 #include <sys/resourcevar.h> 68 #include <sys/kernel.h> 69 #include <sys/systm.h> 70 #include <sys/proc.h> 71 #include <sys/vnode.h> 72 #include <sys/signalvar.h> 73 #include <sys/syslog.h> 74 #include <sys/timetc.h> 75 #include <sys/timex.h> 76 #include <sys/kauth.h> 77 #include <sys/mount.h> 78 #include <sys/syscallargs.h> 79 #include <sys/cpu.h> 80 81 static void timer_intr(void *); 82 static void itimerfire(struct ptimer *); 83 static void itimerfree(struct ptimers *, int); 84 85 kmutex_t timer_lock; 86 87 static void *timer_sih; 88 static TAILQ_HEAD(, ptimer) timer_queue; 89 90 struct pool ptimer_pool, ptimers_pool; 91 92 #define CLOCK_VIRTUAL_P(clockid) \ 93 ((clockid) == CLOCK_VIRTUAL || (clockid) == CLOCK_PROF) 94 95 CTASSERT(ITIMER_REAL == CLOCK_REALTIME); 96 CTASSERT(ITIMER_VIRTUAL == CLOCK_VIRTUAL); 97 CTASSERT(ITIMER_PROF == CLOCK_PROF); 98 CTASSERT(ITIMER_MONOTONIC == CLOCK_MONOTONIC); 99 100 /* 101 * Initialize timekeeping. 102 */ 103 void 104 time_init(void) 105 { 106 107 pool_init(&ptimer_pool, sizeof(struct ptimer), 0, 0, 0, "ptimerpl", 108 &pool_allocator_nointr, IPL_NONE); 109 pool_init(&ptimers_pool, sizeof(struct ptimers), 0, 0, 0, "ptimerspl", 110 &pool_allocator_nointr, IPL_NONE); 111 } 112 113 void 114 time_init2(void) 115 { 116 117 TAILQ_INIT(&timer_queue); 118 mutex_init(&timer_lock, MUTEX_DEFAULT, IPL_SCHED); 119 timer_sih = softint_establish(SOFTINT_CLOCK | SOFTINT_MPSAFE, 120 timer_intr, NULL); 121 } 122 123 /* Time of day and interval timer support. 124 * 125 * These routines provide the kernel entry points to get and set 126 * the time-of-day and per-process interval timers. Subroutines 127 * here provide support for adding and subtracting timeval structures 128 * and decrementing interval timers, optionally reloading the interval 129 * timers when they expire. 130 */ 131 132 /* This function is used by clock_settime and settimeofday */ 133 static int 134 settime1(struct proc *p, const struct timespec *ts, bool check_kauth) 135 { 136 struct timespec delta, now; 137 int s; 138 139 /* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */ 140 s = splclock(); 141 nanotime(&now); 142 timespecsub(ts, &now, &delta); 143 144 if (check_kauth && kauth_authorize_system(kauth_cred_get(), 145 KAUTH_SYSTEM_TIME, KAUTH_REQ_SYSTEM_TIME_SYSTEM, __UNCONST(ts), 146 &delta, KAUTH_ARG(check_kauth ? false : true)) != 0) { 147 splx(s); 148 return (EPERM); 149 } 150 151 #ifdef notyet 152 if ((delta.tv_sec < 86400) && securelevel > 0) { /* XXX elad - notyet */ 153 splx(s); 154 return (EPERM); 155 } 156 #endif 157 158 tc_setclock(ts); 159 160 timespecadd(&boottime, &delta, &boottime); 161 162 resettodr(); 163 splx(s); 164 165 return (0); 166 } 167 168 int 169 settime(struct proc *p, struct timespec *ts) 170 { 171 return (settime1(p, ts, true)); 172 } 173 174 /* ARGSUSED */ 175 int 176 sys___clock_gettime50(struct lwp *l, 177 const struct sys___clock_gettime50_args *uap, register_t *retval) 178 { 179 /* { 180 syscallarg(clockid_t) clock_id; 181 syscallarg(struct timespec *) tp; 182 } */ 183 int error; 184 struct timespec ats; 185 186 error = clock_gettime1(SCARG(uap, clock_id), &ats); 187 if (error != 0) 188 return error; 189 190 return copyout(&ats, SCARG(uap, tp), sizeof(ats)); 191 } 192 193 /* ARGSUSED */ 194 int 195 sys___clock_settime50(struct lwp *l, 196 const struct sys___clock_settime50_args *uap, register_t *retval) 197 { 198 /* { 199 syscallarg(clockid_t) clock_id; 200 syscallarg(const struct timespec *) tp; 201 } */ 202 int error; 203 struct timespec ats; 204 205 if ((error = copyin(SCARG(uap, tp), &ats, sizeof(ats))) != 0) 206 return error; 207 208 return clock_settime1(l->l_proc, SCARG(uap, clock_id), &ats, true); 209 } 210 211 212 int 213 clock_settime1(struct proc *p, clockid_t clock_id, const struct timespec *tp, 214 bool check_kauth) 215 { 216 int error; 217 218 switch (clock_id) { 219 case CLOCK_REALTIME: 220 if ((error = settime1(p, tp, check_kauth)) != 0) 221 return (error); 222 break; 223 case CLOCK_MONOTONIC: 224 return (EINVAL); /* read-only clock */ 225 default: 226 return (EINVAL); 227 } 228 229 return 0; 230 } 231 232 int 233 sys___clock_getres50(struct lwp *l, const struct sys___clock_getres50_args *uap, 234 register_t *retval) 235 { 236 /* { 237 syscallarg(clockid_t) clock_id; 238 syscallarg(struct timespec *) tp; 239 } */ 240 struct timespec ts; 241 int error = 0; 242 243 if ((error = clock_getres1(SCARG(uap, clock_id), &ts)) != 0) 244 return error; 245 246 if (SCARG(uap, tp)) 247 error = copyout(&ts, SCARG(uap, tp), sizeof(ts)); 248 249 return error; 250 } 251 252 int 253 clock_getres1(clockid_t clock_id, struct timespec *ts) 254 { 255 256 switch (clock_id) { 257 case CLOCK_REALTIME: 258 case CLOCK_MONOTONIC: 259 ts->tv_sec = 0; 260 if (tc_getfrequency() > 1000000000) 261 ts->tv_nsec = 1; 262 else 263 ts->tv_nsec = 1000000000 / tc_getfrequency(); 264 break; 265 default: 266 return EINVAL; 267 } 268 269 return 0; 270 } 271 272 /* ARGSUSED */ 273 int 274 sys___nanosleep50(struct lwp *l, const struct sys___nanosleep50_args *uap, 275 register_t *retval) 276 { 277 /* { 278 syscallarg(struct timespec *) rqtp; 279 syscallarg(struct timespec *) rmtp; 280 } */ 281 struct timespec rmt, rqt; 282 int error, error1; 283 284 error = copyin(SCARG(uap, rqtp), &rqt, sizeof(struct timespec)); 285 if (error) 286 return (error); 287 288 error = nanosleep1(l, CLOCK_MONOTONIC, 0, &rqt, 289 SCARG(uap, rmtp) ? &rmt : NULL); 290 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 291 return error; 292 293 error1 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt)); 294 return error1 ? error1 : error; 295 } 296 297 /* ARGSUSED */ 298 int 299 sys_clock_nanosleep(struct lwp *l, const struct sys_clock_nanosleep_args *uap, 300 register_t *retval) 301 { 302 /* { 303 syscallarg(clockid_t) clock_id; 304 syscallarg(int) flags; 305 syscallarg(struct timespec *) rqtp; 306 syscallarg(struct timespec *) rmtp; 307 } */ 308 struct timespec rmt, rqt; 309 int error, error1; 310 311 error = copyin(SCARG(uap, rqtp), &rqt, sizeof(struct timespec)); 312 if (error) 313 return (error); 314 315 error = nanosleep1(l, SCARG(uap, clock_id), SCARG(uap, flags), &rqt, 316 SCARG(uap, rmtp) ? &rmt : NULL); 317 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 318 return error; 319 320 error1 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt)); 321 return error1 ? error1 : error; 322 } 323 324 int 325 nanosleep1(struct lwp *l, clockid_t clock_id, int flags, struct timespec *rqt, 326 struct timespec *rmt) 327 { 328 struct timespec rmtstart; 329 int error, timo; 330 331 if ((error = ts2timo(clock_id, flags, rqt, &timo, &rmtstart)) != 0) { 332 if (error == ETIMEDOUT) { 333 error = 0; 334 if (rmt != NULL) 335 rmt->tv_sec = rmt->tv_nsec = 0; 336 } 337 return error; 338 } 339 340 /* 341 * Avoid inadvertently sleeping forever 342 */ 343 if (timo == 0) 344 timo = 1; 345 again: 346 error = kpause("nanoslp", true, timo, NULL); 347 if (rmt != NULL || error == 0) { 348 struct timespec rmtend; 349 struct timespec t0; 350 struct timespec *t; 351 352 (void)clock_gettime1(clock_id, &rmtend); 353 t = (rmt != NULL) ? rmt : &t0; 354 if (flags & TIMER_ABSTIME) { 355 timespecsub(rqt, &rmtend, t); 356 } else { 357 timespecsub(&rmtend, &rmtstart, t); 358 timespecsub(rqt, t, t); 359 } 360 if (t->tv_sec < 0) 361 timespecclear(t); 362 if (error == 0) { 363 timo = tstohz(t); 364 if (timo > 0) 365 goto again; 366 } 367 } 368 369 if (error == ERESTART) 370 error = EINTR; 371 if (error == EWOULDBLOCK) 372 error = 0; 373 374 return error; 375 } 376 377 /* ARGSUSED */ 378 int 379 sys___gettimeofday50(struct lwp *l, const struct sys___gettimeofday50_args *uap, 380 register_t *retval) 381 { 382 /* { 383 syscallarg(struct timeval *) tp; 384 syscallarg(void *) tzp; really "struct timezone *"; 385 } */ 386 struct timeval atv; 387 int error = 0; 388 struct timezone tzfake; 389 390 if (SCARG(uap, tp)) { 391 microtime(&atv); 392 error = copyout(&atv, SCARG(uap, tp), sizeof(atv)); 393 if (error) 394 return (error); 395 } 396 if (SCARG(uap, tzp)) { 397 /* 398 * NetBSD has no kernel notion of time zone, so we just 399 * fake up a timezone struct and return it if demanded. 400 */ 401 tzfake.tz_minuteswest = 0; 402 tzfake.tz_dsttime = 0; 403 error = copyout(&tzfake, SCARG(uap, tzp), sizeof(tzfake)); 404 } 405 return (error); 406 } 407 408 /* ARGSUSED */ 409 int 410 sys___settimeofday50(struct lwp *l, const struct sys___settimeofday50_args *uap, 411 register_t *retval) 412 { 413 /* { 414 syscallarg(const struct timeval *) tv; 415 syscallarg(const void *) tzp; really "const struct timezone *"; 416 } */ 417 418 return settimeofday1(SCARG(uap, tv), true, SCARG(uap, tzp), l, true); 419 } 420 421 int 422 settimeofday1(const struct timeval *utv, bool userspace, 423 const void *utzp, struct lwp *l, bool check_kauth) 424 { 425 struct timeval atv; 426 struct timespec ts; 427 int error; 428 429 /* Verify all parameters before changing time. */ 430 431 /* 432 * NetBSD has no kernel notion of time zone, and only an 433 * obsolete program would try to set it, so we log a warning. 434 */ 435 if (utzp) 436 log(LOG_WARNING, "pid %d attempted to set the " 437 "(obsolete) kernel time zone\n", l->l_proc->p_pid); 438 439 if (utv == NULL) 440 return 0; 441 442 if (userspace) { 443 if ((error = copyin(utv, &atv, sizeof(atv))) != 0) 444 return error; 445 utv = &atv; 446 } 447 448 TIMEVAL_TO_TIMESPEC(utv, &ts); 449 return settime1(l->l_proc, &ts, check_kauth); 450 } 451 452 int time_adjusted; /* set if an adjustment is made */ 453 454 /* ARGSUSED */ 455 int 456 sys___adjtime50(struct lwp *l, const struct sys___adjtime50_args *uap, 457 register_t *retval) 458 { 459 /* { 460 syscallarg(const struct timeval *) delta; 461 syscallarg(struct timeval *) olddelta; 462 } */ 463 int error = 0; 464 struct timeval atv, oldatv; 465 466 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_TIME, 467 KAUTH_REQ_SYSTEM_TIME_ADJTIME, NULL, NULL, NULL)) != 0) 468 return error; 469 470 if (SCARG(uap, delta)) { 471 error = copyin(SCARG(uap, delta), &atv, 472 sizeof(*SCARG(uap, delta))); 473 if (error) 474 return (error); 475 } 476 adjtime1(SCARG(uap, delta) ? &atv : NULL, 477 SCARG(uap, olddelta) ? &oldatv : NULL, l->l_proc); 478 if (SCARG(uap, olddelta)) 479 error = copyout(&oldatv, SCARG(uap, olddelta), 480 sizeof(*SCARG(uap, olddelta))); 481 return error; 482 } 483 484 void 485 adjtime1(const struct timeval *delta, struct timeval *olddelta, struct proc *p) 486 { 487 extern int64_t time_adjtime; /* in kern_ntptime.c */ 488 489 if (olddelta) { 490 mutex_spin_enter(&timecounter_lock); 491 olddelta->tv_sec = time_adjtime / 1000000; 492 olddelta->tv_usec = time_adjtime % 1000000; 493 if (olddelta->tv_usec < 0) { 494 olddelta->tv_usec += 1000000; 495 olddelta->tv_sec--; 496 } 497 mutex_spin_exit(&timecounter_lock); 498 } 499 500 if (delta) { 501 mutex_spin_enter(&timecounter_lock); 502 time_adjtime = delta->tv_sec * 1000000 + delta->tv_usec; 503 504 if (time_adjtime) { 505 /* We need to save the system time during shutdown */ 506 time_adjusted |= 1; 507 } 508 mutex_spin_exit(&timecounter_lock); 509 } 510 } 511 512 /* 513 * Interval timer support. Both the BSD getitimer() family and the POSIX 514 * timer_*() family of routines are supported. 515 * 516 * All timers are kept in an array pointed to by p_timers, which is 517 * allocated on demand - many processes don't use timers at all. The 518 * first three elements in this array are reserved for the BSD timers: 519 * element 0 is ITIMER_REAL, element 1 is ITIMER_VIRTUAL, element 520 * 2 is ITIMER_PROF, and element 3 is ITIMER_MONOTONIC. The rest may be 521 * allocated by the timer_create() syscall. 522 * 523 * Realtime timers are kept in the ptimer structure as an absolute 524 * time; virtual time timers are kept as a linked list of deltas. 525 * Virtual time timers are processed in the hardclock() routine of 526 * kern_clock.c. The real time timer is processed by a callout 527 * routine, called from the softclock() routine. Since a callout may 528 * be delayed in real time due to interrupt processing in the system, 529 * it is possible for the real time timeout routine (realtimeexpire, 530 * given below), to be delayed in real time past when it is supposed 531 * to occur. It does not suffice, therefore, to reload the real timer 532 * .it_value from the real time timers .it_interval. Rather, we 533 * compute the next time in absolute time the timer should go off. */ 534 535 /* Allocate a POSIX realtime timer. */ 536 int 537 sys_timer_create(struct lwp *l, const struct sys_timer_create_args *uap, 538 register_t *retval) 539 { 540 /* { 541 syscallarg(clockid_t) clock_id; 542 syscallarg(struct sigevent *) evp; 543 syscallarg(timer_t *) timerid; 544 } */ 545 546 return timer_create1(SCARG(uap, timerid), SCARG(uap, clock_id), 547 SCARG(uap, evp), copyin, l); 548 } 549 550 int 551 timer_create1(timer_t *tid, clockid_t id, struct sigevent *evp, 552 copyin_t fetch_event, struct lwp *l) 553 { 554 int error; 555 timer_t timerid; 556 struct ptimers *pts; 557 struct ptimer *pt; 558 struct proc *p; 559 560 p = l->l_proc; 561 562 if ((u_int)id > CLOCK_MONOTONIC) 563 return (EINVAL); 564 565 if ((pts = p->p_timers) == NULL) 566 pts = timers_alloc(p); 567 568 pt = pool_get(&ptimer_pool, PR_WAITOK); 569 memset(pt, 0, sizeof(*pt)); 570 if (evp != NULL) { 571 if (((error = 572 (*fetch_event)(evp, &pt->pt_ev, sizeof(pt->pt_ev))) != 0) || 573 ((pt->pt_ev.sigev_notify < SIGEV_NONE) || 574 (pt->pt_ev.sigev_notify > SIGEV_SA)) || 575 (pt->pt_ev.sigev_notify == SIGEV_SIGNAL && 576 (pt->pt_ev.sigev_signo <= 0 || 577 pt->pt_ev.sigev_signo >= NSIG))) { 578 pool_put(&ptimer_pool, pt); 579 return (error ? error : EINVAL); 580 } 581 } 582 583 /* Find a free timer slot, skipping those reserved for setitimer(). */ 584 mutex_spin_enter(&timer_lock); 585 for (timerid = 3; timerid < TIMER_MAX; timerid++) 586 if (pts->pts_timers[timerid] == NULL) 587 break; 588 if (timerid == TIMER_MAX) { 589 mutex_spin_exit(&timer_lock); 590 pool_put(&ptimer_pool, pt); 591 return EAGAIN; 592 } 593 if (evp == NULL) { 594 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 595 switch (id) { 596 case CLOCK_REALTIME: 597 case CLOCK_MONOTONIC: 598 pt->pt_ev.sigev_signo = SIGALRM; 599 break; 600 case CLOCK_VIRTUAL: 601 pt->pt_ev.sigev_signo = SIGVTALRM; 602 break; 603 case CLOCK_PROF: 604 pt->pt_ev.sigev_signo = SIGPROF; 605 break; 606 } 607 pt->pt_ev.sigev_value.sival_int = timerid; 608 } 609 pt->pt_info.ksi_signo = pt->pt_ev.sigev_signo; 610 pt->pt_info.ksi_errno = 0; 611 pt->pt_info.ksi_code = 0; 612 pt->pt_info.ksi_pid = p->p_pid; 613 pt->pt_info.ksi_uid = kauth_cred_getuid(l->l_cred); 614 pt->pt_info.ksi_value = pt->pt_ev.sigev_value; 615 pt->pt_type = id; 616 pt->pt_proc = p; 617 pt->pt_overruns = 0; 618 pt->pt_poverruns = 0; 619 pt->pt_entry = timerid; 620 pt->pt_queued = false; 621 timespecclear(&pt->pt_time.it_value); 622 if (!CLOCK_VIRTUAL_P(id)) 623 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 624 else 625 pt->pt_active = 0; 626 627 pts->pts_timers[timerid] = pt; 628 mutex_spin_exit(&timer_lock); 629 630 return copyout(&timerid, tid, sizeof(timerid)); 631 } 632 633 /* Delete a POSIX realtime timer */ 634 int 635 sys_timer_delete(struct lwp *l, const struct sys_timer_delete_args *uap, 636 register_t *retval) 637 { 638 /* { 639 syscallarg(timer_t) timerid; 640 } */ 641 struct proc *p = l->l_proc; 642 timer_t timerid; 643 struct ptimers *pts; 644 struct ptimer *pt, *ptn; 645 646 timerid = SCARG(uap, timerid); 647 pts = p->p_timers; 648 649 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 650 return (EINVAL); 651 652 mutex_spin_enter(&timer_lock); 653 if ((pt = pts->pts_timers[timerid]) == NULL) { 654 mutex_spin_exit(&timer_lock); 655 return (EINVAL); 656 } 657 if (CLOCK_VIRTUAL_P(pt->pt_type)) { 658 if (pt->pt_active) { 659 ptn = LIST_NEXT(pt, pt_list); 660 LIST_REMOVE(pt, pt_list); 661 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 662 timespecadd(&pt->pt_time.it_value, 663 &ptn->pt_time.it_value, 664 &ptn->pt_time.it_value); 665 pt->pt_active = 0; 666 } 667 } 668 itimerfree(pts, timerid); 669 670 return (0); 671 } 672 673 /* 674 * Set up the given timer. The value in pt->pt_time.it_value is taken 675 * to be an absolute time for CLOCK_REALTIME/CLOCK_MONOTONIC timers and 676 * a relative time for CLOCK_VIRTUAL/CLOCK_PROF timers. 677 */ 678 void 679 timer_settime(struct ptimer *pt) 680 { 681 struct ptimer *ptn, *pptn; 682 struct ptlist *ptl; 683 684 KASSERT(mutex_owned(&timer_lock)); 685 686 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 687 callout_halt(&pt->pt_ch, &timer_lock); 688 if (timespecisset(&pt->pt_time.it_value)) { 689 /* 690 * Don't need to check tshzto() return value, here. 691 * callout_reset() does it for us. 692 */ 693 callout_reset(&pt->pt_ch, 694 pt->pt_type == CLOCK_MONOTONIC ? 695 tshztoup(&pt->pt_time.it_value) : 696 tshzto(&pt->pt_time.it_value), 697 realtimerexpire, pt); 698 } 699 } else { 700 if (pt->pt_active) { 701 ptn = LIST_NEXT(pt, pt_list); 702 LIST_REMOVE(pt, pt_list); 703 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 704 timespecadd(&pt->pt_time.it_value, 705 &ptn->pt_time.it_value, 706 &ptn->pt_time.it_value); 707 } 708 if (timespecisset(&pt->pt_time.it_value)) { 709 if (pt->pt_type == CLOCK_VIRTUAL) 710 ptl = &pt->pt_proc->p_timers->pts_virtual; 711 else 712 ptl = &pt->pt_proc->p_timers->pts_prof; 713 714 for (ptn = LIST_FIRST(ptl), pptn = NULL; 715 ptn && timespeccmp(&pt->pt_time.it_value, 716 &ptn->pt_time.it_value, >); 717 pptn = ptn, ptn = LIST_NEXT(ptn, pt_list)) 718 timespecsub(&pt->pt_time.it_value, 719 &ptn->pt_time.it_value, 720 &pt->pt_time.it_value); 721 722 if (pptn) 723 LIST_INSERT_AFTER(pptn, pt, pt_list); 724 else 725 LIST_INSERT_HEAD(ptl, pt, pt_list); 726 727 for ( ; ptn ; ptn = LIST_NEXT(ptn, pt_list)) 728 timespecsub(&ptn->pt_time.it_value, 729 &pt->pt_time.it_value, 730 &ptn->pt_time.it_value); 731 732 pt->pt_active = 1; 733 } else 734 pt->pt_active = 0; 735 } 736 } 737 738 void 739 timer_gettime(struct ptimer *pt, struct itimerspec *aits) 740 { 741 struct timespec now; 742 struct ptimer *ptn; 743 744 KASSERT(mutex_owned(&timer_lock)); 745 746 *aits = pt->pt_time; 747 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 748 /* 749 * Convert from absolute to relative time in .it_value 750 * part of real time timer. If time for real time 751 * timer has passed return 0, else return difference 752 * between current time and time for the timer to go 753 * off. 754 */ 755 if (timespecisset(&aits->it_value)) { 756 if (pt->pt_type == CLOCK_REALTIME) { 757 getnanotime(&now); 758 } else { /* CLOCK_MONOTONIC */ 759 getnanouptime(&now); 760 } 761 if (timespeccmp(&aits->it_value, &now, <)) 762 timespecclear(&aits->it_value); 763 else 764 timespecsub(&aits->it_value, &now, 765 &aits->it_value); 766 } 767 } else if (pt->pt_active) { 768 if (pt->pt_type == CLOCK_VIRTUAL) 769 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_virtual); 770 else 771 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_prof); 772 for ( ; ptn && ptn != pt; ptn = LIST_NEXT(ptn, pt_list)) 773 timespecadd(&aits->it_value, 774 &ptn->pt_time.it_value, &aits->it_value); 775 KASSERT(ptn != NULL); /* pt should be findable on the list */ 776 } else 777 timespecclear(&aits->it_value); 778 } 779 780 781 782 /* Set and arm a POSIX realtime timer */ 783 int 784 sys___timer_settime50(struct lwp *l, 785 const struct sys___timer_settime50_args *uap, 786 register_t *retval) 787 { 788 /* { 789 syscallarg(timer_t) timerid; 790 syscallarg(int) flags; 791 syscallarg(const struct itimerspec *) value; 792 syscallarg(struct itimerspec *) ovalue; 793 } */ 794 int error; 795 struct itimerspec value, ovalue, *ovp = NULL; 796 797 if ((error = copyin(SCARG(uap, value), &value, 798 sizeof(struct itimerspec))) != 0) 799 return (error); 800 801 if (SCARG(uap, ovalue)) 802 ovp = &ovalue; 803 804 if ((error = dotimer_settime(SCARG(uap, timerid), &value, ovp, 805 SCARG(uap, flags), l->l_proc)) != 0) 806 return error; 807 808 if (ovp) 809 return copyout(&ovalue, SCARG(uap, ovalue), 810 sizeof(struct itimerspec)); 811 return 0; 812 } 813 814 int 815 dotimer_settime(int timerid, struct itimerspec *value, 816 struct itimerspec *ovalue, int flags, struct proc *p) 817 { 818 struct timespec now; 819 struct itimerspec val, oval; 820 struct ptimers *pts; 821 struct ptimer *pt; 822 int error; 823 824 pts = p->p_timers; 825 826 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 827 return EINVAL; 828 val = *value; 829 if ((error = itimespecfix(&val.it_value)) != 0 || 830 (error = itimespecfix(&val.it_interval)) != 0) 831 return error; 832 833 mutex_spin_enter(&timer_lock); 834 if ((pt = pts->pts_timers[timerid]) == NULL) { 835 mutex_spin_exit(&timer_lock); 836 return EINVAL; 837 } 838 839 oval = pt->pt_time; 840 pt->pt_time = val; 841 842 /* 843 * If we've been passed a relative time for a realtime timer, 844 * convert it to absolute; if an absolute time for a virtual 845 * timer, convert it to relative and make sure we don't set it 846 * to zero, which would cancel the timer, or let it go 847 * negative, which would confuse the comparison tests. 848 */ 849 if (timespecisset(&pt->pt_time.it_value)) { 850 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 851 if ((flags & TIMER_ABSTIME) == 0) { 852 if (pt->pt_type == CLOCK_REALTIME) { 853 getnanotime(&now); 854 } else { /* CLOCK_MONOTONIC */ 855 getnanouptime(&now); 856 } 857 timespecadd(&pt->pt_time.it_value, &now, 858 &pt->pt_time.it_value); 859 } 860 } else { 861 if ((flags & TIMER_ABSTIME) != 0) { 862 getnanotime(&now); 863 timespecsub(&pt->pt_time.it_value, &now, 864 &pt->pt_time.it_value); 865 if (!timespecisset(&pt->pt_time.it_value) || 866 pt->pt_time.it_value.tv_sec < 0) { 867 pt->pt_time.it_value.tv_sec = 0; 868 pt->pt_time.it_value.tv_nsec = 1; 869 } 870 } 871 } 872 } 873 874 timer_settime(pt); 875 mutex_spin_exit(&timer_lock); 876 877 if (ovalue) 878 *ovalue = oval; 879 880 return (0); 881 } 882 883 /* Return the time remaining until a POSIX timer fires. */ 884 int 885 sys___timer_gettime50(struct lwp *l, 886 const struct sys___timer_gettime50_args *uap, register_t *retval) 887 { 888 /* { 889 syscallarg(timer_t) timerid; 890 syscallarg(struct itimerspec *) value; 891 } */ 892 struct itimerspec its; 893 int error; 894 895 if ((error = dotimer_gettime(SCARG(uap, timerid), l->l_proc, 896 &its)) != 0) 897 return error; 898 899 return copyout(&its, SCARG(uap, value), sizeof(its)); 900 } 901 902 int 903 dotimer_gettime(int timerid, struct proc *p, struct itimerspec *its) 904 { 905 struct ptimer *pt; 906 struct ptimers *pts; 907 908 pts = p->p_timers; 909 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 910 return (EINVAL); 911 mutex_spin_enter(&timer_lock); 912 if ((pt = pts->pts_timers[timerid]) == NULL) { 913 mutex_spin_exit(&timer_lock); 914 return (EINVAL); 915 } 916 timer_gettime(pt, its); 917 mutex_spin_exit(&timer_lock); 918 919 return 0; 920 } 921 922 /* 923 * Return the count of the number of times a periodic timer expired 924 * while a notification was already pending. The counter is reset when 925 * a timer expires and a notification can be posted. 926 */ 927 int 928 sys_timer_getoverrun(struct lwp *l, const struct sys_timer_getoverrun_args *uap, 929 register_t *retval) 930 { 931 /* { 932 syscallarg(timer_t) timerid; 933 } */ 934 struct proc *p = l->l_proc; 935 struct ptimers *pts; 936 int timerid; 937 struct ptimer *pt; 938 939 timerid = SCARG(uap, timerid); 940 941 pts = p->p_timers; 942 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 943 return (EINVAL); 944 mutex_spin_enter(&timer_lock); 945 if ((pt = pts->pts_timers[timerid]) == NULL) { 946 mutex_spin_exit(&timer_lock); 947 return (EINVAL); 948 } 949 *retval = pt->pt_poverruns; 950 mutex_spin_exit(&timer_lock); 951 952 return (0); 953 } 954 955 /* 956 * Real interval timer expired: 957 * send process whose timer expired an alarm signal. 958 * If time is not set up to reload, then just return. 959 * Else compute next time timer should go off which is > current time. 960 * This is where delay in processing this timeout causes multiple 961 * SIGALRM calls to be compressed into one. 962 */ 963 void 964 realtimerexpire(void *arg) 965 { 966 uint64_t last_val, next_val, interval, now_ns; 967 struct timespec now, next; 968 struct ptimer *pt; 969 int backwards; 970 971 pt = arg; 972 973 mutex_spin_enter(&timer_lock); 974 itimerfire(pt); 975 976 if (!timespecisset(&pt->pt_time.it_interval)) { 977 timespecclear(&pt->pt_time.it_value); 978 mutex_spin_exit(&timer_lock); 979 return; 980 } 981 982 if (pt->pt_type == CLOCK_MONOTONIC) { 983 getnanouptime(&now); 984 } else { 985 getnanotime(&now); 986 } 987 backwards = (timespeccmp(&pt->pt_time.it_value, &now, >)); 988 timespecadd(&pt->pt_time.it_value, &pt->pt_time.it_interval, &next); 989 /* Handle the easy case of non-overflown timers first. */ 990 if (!backwards && timespeccmp(&next, &now, >)) { 991 pt->pt_time.it_value = next; 992 } else { 993 now_ns = timespec2ns(&now); 994 last_val = timespec2ns(&pt->pt_time.it_value); 995 interval = timespec2ns(&pt->pt_time.it_interval); 996 997 next_val = now_ns + 998 (now_ns - last_val + interval - 1) % interval; 999 1000 if (backwards) 1001 next_val += interval; 1002 else 1003 pt->pt_overruns += (now_ns - last_val) / interval; 1004 1005 pt->pt_time.it_value.tv_sec = next_val / 1000000000; 1006 pt->pt_time.it_value.tv_nsec = next_val % 1000000000; 1007 } 1008 1009 /* 1010 * Don't need to check tshzto() return value, here. 1011 * callout_reset() does it for us. 1012 */ 1013 callout_reset(&pt->pt_ch, pt->pt_type == CLOCK_MONOTONIC ? 1014 tshztoup(&pt->pt_time.it_value) : tshzto(&pt->pt_time.it_value), 1015 realtimerexpire, pt); 1016 mutex_spin_exit(&timer_lock); 1017 } 1018 1019 /* BSD routine to get the value of an interval timer. */ 1020 /* ARGSUSED */ 1021 int 1022 sys___getitimer50(struct lwp *l, const struct sys___getitimer50_args *uap, 1023 register_t *retval) 1024 { 1025 /* { 1026 syscallarg(int) which; 1027 syscallarg(struct itimerval *) itv; 1028 } */ 1029 struct proc *p = l->l_proc; 1030 struct itimerval aitv; 1031 int error; 1032 1033 memset(&aitv, 0, sizeof(aitv)); 1034 error = dogetitimer(p, SCARG(uap, which), &aitv); 1035 if (error) 1036 return error; 1037 return (copyout(&aitv, SCARG(uap, itv), sizeof(struct itimerval))); 1038 } 1039 1040 int 1041 dogetitimer(struct proc *p, int which, struct itimerval *itvp) 1042 { 1043 struct ptimers *pts; 1044 struct ptimer *pt; 1045 struct itimerspec its; 1046 1047 if ((u_int)which > ITIMER_MONOTONIC) 1048 return (EINVAL); 1049 1050 mutex_spin_enter(&timer_lock); 1051 pts = p->p_timers; 1052 if (pts == NULL || (pt = pts->pts_timers[which]) == NULL) { 1053 timerclear(&itvp->it_value); 1054 timerclear(&itvp->it_interval); 1055 } else { 1056 timer_gettime(pt, &its); 1057 TIMESPEC_TO_TIMEVAL(&itvp->it_value, &its.it_value); 1058 TIMESPEC_TO_TIMEVAL(&itvp->it_interval, &its.it_interval); 1059 } 1060 mutex_spin_exit(&timer_lock); 1061 1062 return 0; 1063 } 1064 1065 /* BSD routine to set/arm an interval timer. */ 1066 /* ARGSUSED */ 1067 int 1068 sys___setitimer50(struct lwp *l, const struct sys___setitimer50_args *uap, 1069 register_t *retval) 1070 { 1071 /* { 1072 syscallarg(int) which; 1073 syscallarg(const struct itimerval *) itv; 1074 syscallarg(struct itimerval *) oitv; 1075 } */ 1076 struct proc *p = l->l_proc; 1077 int which = SCARG(uap, which); 1078 struct sys___getitimer50_args getargs; 1079 const struct itimerval *itvp; 1080 struct itimerval aitv; 1081 int error; 1082 1083 if ((u_int)which > ITIMER_MONOTONIC) 1084 return (EINVAL); 1085 itvp = SCARG(uap, itv); 1086 if (itvp && 1087 (error = copyin(itvp, &aitv, sizeof(struct itimerval))) != 0) 1088 return (error); 1089 if (SCARG(uap, oitv) != NULL) { 1090 SCARG(&getargs, which) = which; 1091 SCARG(&getargs, itv) = SCARG(uap, oitv); 1092 if ((error = sys___getitimer50(l, &getargs, retval)) != 0) 1093 return (error); 1094 } 1095 if (itvp == 0) 1096 return (0); 1097 1098 return dosetitimer(p, which, &aitv); 1099 } 1100 1101 int 1102 dosetitimer(struct proc *p, int which, struct itimerval *itvp) 1103 { 1104 struct timespec now; 1105 struct ptimers *pts; 1106 struct ptimer *pt, *spare; 1107 1108 KASSERT((u_int)which <= CLOCK_MONOTONIC); 1109 if (itimerfix(&itvp->it_value) || itimerfix(&itvp->it_interval)) 1110 return (EINVAL); 1111 1112 /* 1113 * Don't bother allocating data structures if the process just 1114 * wants to clear the timer. 1115 */ 1116 spare = NULL; 1117 pts = p->p_timers; 1118 retry: 1119 if (!timerisset(&itvp->it_value) && (pts == NULL || 1120 pts->pts_timers[which] == NULL)) 1121 return (0); 1122 if (pts == NULL) 1123 pts = timers_alloc(p); 1124 mutex_spin_enter(&timer_lock); 1125 pt = pts->pts_timers[which]; 1126 if (pt == NULL) { 1127 if (spare == NULL) { 1128 mutex_spin_exit(&timer_lock); 1129 spare = pool_get(&ptimer_pool, PR_WAITOK); 1130 memset(spare, 0, sizeof(*spare)); 1131 goto retry; 1132 } 1133 pt = spare; 1134 spare = NULL; 1135 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 1136 pt->pt_ev.sigev_value.sival_int = which; 1137 pt->pt_overruns = 0; 1138 pt->pt_proc = p; 1139 pt->pt_type = which; 1140 pt->pt_entry = which; 1141 pt->pt_queued = false; 1142 if (pt->pt_type == CLOCK_REALTIME) 1143 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 1144 else 1145 pt->pt_active = 0; 1146 1147 switch (which) { 1148 case ITIMER_REAL: 1149 case ITIMER_MONOTONIC: 1150 pt->pt_ev.sigev_signo = SIGALRM; 1151 break; 1152 case ITIMER_VIRTUAL: 1153 pt->pt_ev.sigev_signo = SIGVTALRM; 1154 break; 1155 case ITIMER_PROF: 1156 pt->pt_ev.sigev_signo = SIGPROF; 1157 break; 1158 } 1159 pts->pts_timers[which] = pt; 1160 } 1161 1162 TIMEVAL_TO_TIMESPEC(&itvp->it_value, &pt->pt_time.it_value); 1163 TIMEVAL_TO_TIMESPEC(&itvp->it_interval, &pt->pt_time.it_interval); 1164 1165 if (timespecisset(&pt->pt_time.it_value)) { 1166 /* Convert to absolute time */ 1167 /* XXX need to wrap in splclock for timecounters case? */ 1168 switch (which) { 1169 case ITIMER_REAL: 1170 getnanotime(&now); 1171 timespecadd(&pt->pt_time.it_value, &now, 1172 &pt->pt_time.it_value); 1173 break; 1174 case ITIMER_MONOTONIC: 1175 getnanouptime(&now); 1176 timespecadd(&pt->pt_time.it_value, &now, 1177 &pt->pt_time.it_value); 1178 break; 1179 default: 1180 break; 1181 } 1182 } 1183 timer_settime(pt); 1184 mutex_spin_exit(&timer_lock); 1185 if (spare != NULL) 1186 pool_put(&ptimer_pool, spare); 1187 1188 return (0); 1189 } 1190 1191 /* Utility routines to manage the array of pointers to timers. */ 1192 struct ptimers * 1193 timers_alloc(struct proc *p) 1194 { 1195 struct ptimers *pts; 1196 int i; 1197 1198 pts = pool_get(&ptimers_pool, PR_WAITOK); 1199 LIST_INIT(&pts->pts_virtual); 1200 LIST_INIT(&pts->pts_prof); 1201 for (i = 0; i < TIMER_MAX; i++) 1202 pts->pts_timers[i] = NULL; 1203 pts->pts_fired = 0; 1204 mutex_spin_enter(&timer_lock); 1205 if (p->p_timers == NULL) { 1206 p->p_timers = pts; 1207 mutex_spin_exit(&timer_lock); 1208 return pts; 1209 } 1210 mutex_spin_exit(&timer_lock); 1211 pool_put(&ptimers_pool, pts); 1212 return p->p_timers; 1213 } 1214 1215 /* 1216 * Clean up the per-process timers. If "which" is set to TIMERS_ALL, 1217 * then clean up all timers and free all the data structures. If 1218 * "which" is set to TIMERS_POSIX, only clean up the timers allocated 1219 * by timer_create(), not the BSD setitimer() timers, and only free the 1220 * structure if none of those remain. 1221 */ 1222 void 1223 timers_free(struct proc *p, int which) 1224 { 1225 struct ptimers *pts; 1226 struct ptimer *ptn; 1227 struct timespec ts; 1228 int i; 1229 1230 if (p->p_timers == NULL) 1231 return; 1232 1233 pts = p->p_timers; 1234 mutex_spin_enter(&timer_lock); 1235 if (which == TIMERS_ALL) { 1236 p->p_timers = NULL; 1237 i = 0; 1238 } else { 1239 timespecclear(&ts); 1240 for (ptn = LIST_FIRST(&pts->pts_virtual); 1241 ptn && ptn != pts->pts_timers[ITIMER_VIRTUAL]; 1242 ptn = LIST_NEXT(ptn, pt_list)) { 1243 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1244 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1245 } 1246 LIST_FIRST(&pts->pts_virtual) = NULL; 1247 if (ptn) { 1248 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1249 timespecadd(&ts, &ptn->pt_time.it_value, 1250 &ptn->pt_time.it_value); 1251 LIST_INSERT_HEAD(&pts->pts_virtual, ptn, pt_list); 1252 } 1253 timespecclear(&ts); 1254 for (ptn = LIST_FIRST(&pts->pts_prof); 1255 ptn && ptn != pts->pts_timers[ITIMER_PROF]; 1256 ptn = LIST_NEXT(ptn, pt_list)) { 1257 KASSERT(ptn->pt_type == CLOCK_PROF); 1258 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1259 } 1260 LIST_FIRST(&pts->pts_prof) = NULL; 1261 if (ptn) { 1262 KASSERT(ptn->pt_type == CLOCK_PROF); 1263 timespecadd(&ts, &ptn->pt_time.it_value, 1264 &ptn->pt_time.it_value); 1265 LIST_INSERT_HEAD(&pts->pts_prof, ptn, pt_list); 1266 } 1267 i = 3; 1268 } 1269 for ( ; i < TIMER_MAX; i++) { 1270 if (pts->pts_timers[i] != NULL) { 1271 itimerfree(pts, i); 1272 mutex_spin_enter(&timer_lock); 1273 } 1274 } 1275 if (pts->pts_timers[0] == NULL && pts->pts_timers[1] == NULL && 1276 pts->pts_timers[2] == NULL) { 1277 p->p_timers = NULL; 1278 mutex_spin_exit(&timer_lock); 1279 pool_put(&ptimers_pool, pts); 1280 } else 1281 mutex_spin_exit(&timer_lock); 1282 } 1283 1284 static void 1285 itimerfree(struct ptimers *pts, int index) 1286 { 1287 struct ptimer *pt; 1288 1289 KASSERT(mutex_owned(&timer_lock)); 1290 1291 pt = pts->pts_timers[index]; 1292 pts->pts_timers[index] = NULL; 1293 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1294 callout_halt(&pt->pt_ch, &timer_lock); 1295 if (pt->pt_queued) 1296 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1297 mutex_spin_exit(&timer_lock); 1298 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1299 callout_destroy(&pt->pt_ch); 1300 pool_put(&ptimer_pool, pt); 1301 } 1302 1303 /* 1304 * Decrement an interval timer by a specified number 1305 * of nanoseconds, which must be less than a second, 1306 * i.e. < 1000000000. If the timer expires, then reload 1307 * it. In this case, carry over (nsec - old value) to 1308 * reduce the value reloaded into the timer so that 1309 * the timer does not drift. This routine assumes 1310 * that it is called in a context where the timers 1311 * on which it is operating cannot change in value. 1312 */ 1313 static int 1314 itimerdecr(struct ptimer *pt, int nsec) 1315 { 1316 struct itimerspec *itp; 1317 1318 KASSERT(mutex_owned(&timer_lock)); 1319 KASSERT(CLOCK_VIRTUAL_P(pt->pt_type)); 1320 1321 itp = &pt->pt_time; 1322 if (itp->it_value.tv_nsec < nsec) { 1323 if (itp->it_value.tv_sec == 0) { 1324 /* expired, and already in next interval */ 1325 nsec -= itp->it_value.tv_nsec; 1326 goto expire; 1327 } 1328 itp->it_value.tv_nsec += 1000000000; 1329 itp->it_value.tv_sec--; 1330 } 1331 itp->it_value.tv_nsec -= nsec; 1332 nsec = 0; 1333 if (timespecisset(&itp->it_value)) 1334 return (1); 1335 /* expired, exactly at end of interval */ 1336 expire: 1337 if (timespecisset(&itp->it_interval)) { 1338 itp->it_value = itp->it_interval; 1339 itp->it_value.tv_nsec -= nsec; 1340 if (itp->it_value.tv_nsec < 0) { 1341 itp->it_value.tv_nsec += 1000000000; 1342 itp->it_value.tv_sec--; 1343 } 1344 timer_settime(pt); 1345 } else 1346 itp->it_value.tv_nsec = 0; /* sec is already 0 */ 1347 return (0); 1348 } 1349 1350 static void 1351 itimerfire(struct ptimer *pt) 1352 { 1353 1354 KASSERT(mutex_owned(&timer_lock)); 1355 1356 /* 1357 * XXX Can overrun, but we don't do signal queueing yet, anyway. 1358 * XXX Relying on the clock interrupt is stupid. 1359 */ 1360 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL || pt->pt_queued) { 1361 return; 1362 } 1363 TAILQ_INSERT_TAIL(&timer_queue, pt, pt_chain); 1364 pt->pt_queued = true; 1365 softint_schedule(timer_sih); 1366 } 1367 1368 void 1369 timer_tick(lwp_t *l, bool user) 1370 { 1371 struct ptimers *pts; 1372 struct ptimer *pt; 1373 proc_t *p; 1374 1375 p = l->l_proc; 1376 if (p->p_timers == NULL) 1377 return; 1378 1379 mutex_spin_enter(&timer_lock); 1380 if ((pts = l->l_proc->p_timers) != NULL) { 1381 /* 1382 * Run current process's virtual and profile time, as needed. 1383 */ 1384 if (user && (pt = LIST_FIRST(&pts->pts_virtual)) != NULL) 1385 if (itimerdecr(pt, tick * 1000) == 0) 1386 itimerfire(pt); 1387 if ((pt = LIST_FIRST(&pts->pts_prof)) != NULL) 1388 if (itimerdecr(pt, tick * 1000) == 0) 1389 itimerfire(pt); 1390 } 1391 mutex_spin_exit(&timer_lock); 1392 } 1393 1394 static void 1395 timer_intr(void *cookie) 1396 { 1397 ksiginfo_t ksi; 1398 struct ptimer *pt; 1399 proc_t *p; 1400 1401 mutex_enter(proc_lock); 1402 mutex_spin_enter(&timer_lock); 1403 while ((pt = TAILQ_FIRST(&timer_queue)) != NULL) { 1404 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1405 KASSERT(pt->pt_queued); 1406 pt->pt_queued = false; 1407 1408 if (pt->pt_proc->p_timers == NULL) { 1409 /* Process is dying. */ 1410 continue; 1411 } 1412 p = pt->pt_proc; 1413 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL) { 1414 continue; 1415 } 1416 if (sigismember(&p->p_sigpend.sp_set, pt->pt_ev.sigev_signo)) { 1417 pt->pt_overruns++; 1418 continue; 1419 } 1420 1421 KSI_INIT(&ksi); 1422 ksi.ksi_signo = pt->pt_ev.sigev_signo; 1423 ksi.ksi_code = SI_TIMER; 1424 ksi.ksi_value = pt->pt_ev.sigev_value; 1425 pt->pt_poverruns = pt->pt_overruns; 1426 pt->pt_overruns = 0; 1427 mutex_spin_exit(&timer_lock); 1428 kpsignal(p, &ksi, NULL); 1429 mutex_spin_enter(&timer_lock); 1430 } 1431 mutex_spin_exit(&timer_lock); 1432 mutex_exit(proc_lock); 1433 } 1434 1435 /* 1436 * Check if the time will wrap if set to ts. 1437 * 1438 * ts - timespec describing the new time 1439 * delta - the delta between the current time and ts 1440 */ 1441 bool 1442 time_wraps(struct timespec *ts, struct timespec *delta) 1443 { 1444 1445 /* 1446 * Don't allow the time to be set forward so far it 1447 * will wrap and become negative, thus allowing an 1448 * attacker to bypass the next check below. The 1449 * cutoff is 1 year before rollover occurs, so even 1450 * if the attacker uses adjtime(2) to move the time 1451 * past the cutoff, it will take a very long time 1452 * to get to the wrap point. 1453 */ 1454 if ((ts->tv_sec > LLONG_MAX - 365*24*60*60) || 1455 (delta->tv_sec < 0 || delta->tv_nsec < 0)) 1456 return true; 1457 1458 return false; 1459 } 1460
Indexes created Mon Sep 29 21:09:56 GMT 2025