kern_time.c revision 1.179.10.2
1 /* $NetBSD: kern_time.c,v 1.179.10.2 2015/12/27 12:10:05 skrll 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 1.179.10.2 2015/12/27 12:10:05 skrll 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; 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 goto out; 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 goto out; 319 320 if ((error1 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt))) != 0) 321 error = error1; 322 out: 323 *retval = error; 324 return 0; 325 } 326 327 int 328 nanosleep1(struct lwp *l, clockid_t clock_id, int flags, struct timespec *rqt, 329 struct timespec *rmt) 330 { 331 struct timespec rmtstart; 332 int error, timo; 333 334 if ((error = ts2timo(clock_id, flags, rqt, &timo, &rmtstart)) != 0) 335 return error == ETIMEDOUT ? 0 : error; 336 337 /* 338 * Avoid inadvertently sleeping forever 339 */ 340 if (timo == 0) 341 timo = 1; 342 again: 343 error = kpause("nanoslp", true, timo, NULL); 344 if (rmt != NULL || error == 0) { 345 struct timespec rmtend; 346 struct timespec t0; 347 struct timespec *t; 348 349 (void)clock_gettime1(clock_id, &rmtend); 350 t = (rmt != NULL) ? rmt : &t0; 351 if (flags & TIMER_ABSTIME) { 352 timespecsub(rqt, &rmtend, t); 353 } else { 354 timespecsub(&rmtend, &rmtstart, t); 355 timespecsub(rqt, t, t); 356 } 357 if (t->tv_sec < 0) 358 timespecclear(t); 359 if (error == 0) { 360 timo = tstohz(t); 361 if (timo > 0) 362 goto again; 363 } 364 } 365 366 if (error == ERESTART) 367 error = EINTR; 368 if (error == EWOULDBLOCK) 369 error = 0; 370 371 return error; 372 } 373 374 /* ARGSUSED */ 375 int 376 sys___gettimeofday50(struct lwp *l, const struct sys___gettimeofday50_args *uap, 377 register_t *retval) 378 { 379 /* { 380 syscallarg(struct timeval *) tp; 381 syscallarg(void *) tzp; really "struct timezone *"; 382 } */ 383 struct timeval atv; 384 int error = 0; 385 struct timezone tzfake; 386 387 if (SCARG(uap, tp)) { 388 microtime(&atv); 389 error = copyout(&atv, SCARG(uap, tp), sizeof(atv)); 390 if (error) 391 return (error); 392 } 393 if (SCARG(uap, tzp)) { 394 /* 395 * NetBSD has no kernel notion of time zone, so we just 396 * fake up a timezone struct and return it if demanded. 397 */ 398 tzfake.tz_minuteswest = 0; 399 tzfake.tz_dsttime = 0; 400 error = copyout(&tzfake, SCARG(uap, tzp), sizeof(tzfake)); 401 } 402 return (error); 403 } 404 405 /* ARGSUSED */ 406 int 407 sys___settimeofday50(struct lwp *l, const struct sys___settimeofday50_args *uap, 408 register_t *retval) 409 { 410 /* { 411 syscallarg(const struct timeval *) tv; 412 syscallarg(const void *) tzp; really "const struct timezone *"; 413 } */ 414 415 return settimeofday1(SCARG(uap, tv), true, SCARG(uap, tzp), l, true); 416 } 417 418 int 419 settimeofday1(const struct timeval *utv, bool userspace, 420 const void *utzp, struct lwp *l, bool check_kauth) 421 { 422 struct timeval atv; 423 struct timespec ts; 424 int error; 425 426 /* Verify all parameters before changing time. */ 427 428 /* 429 * NetBSD has no kernel notion of time zone, and only an 430 * obsolete program would try to set it, so we log a warning. 431 */ 432 if (utzp) 433 log(LOG_WARNING, "pid %d attempted to set the " 434 "(obsolete) kernel time zone\n", l->l_proc->p_pid); 435 436 if (utv == NULL) 437 return 0; 438 439 if (userspace) { 440 if ((error = copyin(utv, &atv, sizeof(atv))) != 0) 441 return error; 442 utv = &atv; 443 } 444 445 TIMEVAL_TO_TIMESPEC(utv, &ts); 446 return settime1(l->l_proc, &ts, check_kauth); 447 } 448 449 int time_adjusted; /* set if an adjustment is made */ 450 451 /* ARGSUSED */ 452 int 453 sys___adjtime50(struct lwp *l, const struct sys___adjtime50_args *uap, 454 register_t *retval) 455 { 456 /* { 457 syscallarg(const struct timeval *) delta; 458 syscallarg(struct timeval *) olddelta; 459 } */ 460 int error; 461 struct timeval atv, oldatv; 462 463 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_TIME, 464 KAUTH_REQ_SYSTEM_TIME_ADJTIME, NULL, NULL, NULL)) != 0) 465 return error; 466 467 if (SCARG(uap, delta)) { 468 error = copyin(SCARG(uap, delta), &atv, 469 sizeof(*SCARG(uap, delta))); 470 if (error) 471 return (error); 472 } 473 adjtime1(SCARG(uap, delta) ? &atv : NULL, 474 SCARG(uap, olddelta) ? &oldatv : NULL, l->l_proc); 475 if (SCARG(uap, olddelta)) 476 error = copyout(&oldatv, SCARG(uap, olddelta), 477 sizeof(*SCARG(uap, olddelta))); 478 return error; 479 } 480 481 void 482 adjtime1(const struct timeval *delta, struct timeval *olddelta, struct proc *p) 483 { 484 extern int64_t time_adjtime; /* in kern_ntptime.c */ 485 486 if (olddelta) { 487 mutex_spin_enter(&timecounter_lock); 488 olddelta->tv_sec = time_adjtime / 1000000; 489 olddelta->tv_usec = time_adjtime % 1000000; 490 if (olddelta->tv_usec < 0) { 491 olddelta->tv_usec += 1000000; 492 olddelta->tv_sec--; 493 } 494 mutex_spin_exit(&timecounter_lock); 495 } 496 497 if (delta) { 498 mutex_spin_enter(&timecounter_lock); 499 time_adjtime = delta->tv_sec * 1000000 + delta->tv_usec; 500 501 if (time_adjtime) { 502 /* We need to save the system time during shutdown */ 503 time_adjusted |= 1; 504 } 505 mutex_spin_exit(&timecounter_lock); 506 } 507 } 508 509 /* 510 * Interval timer support. Both the BSD getitimer() family and the POSIX 511 * timer_*() family of routines are supported. 512 * 513 * All timers are kept in an array pointed to by p_timers, which is 514 * allocated on demand - many processes don't use timers at all. The 515 * first three elements in this array are reserved for the BSD timers: 516 * element 0 is ITIMER_REAL, element 1 is ITIMER_VIRTUAL, element 517 * 2 is ITIMER_PROF, and element 3 is ITIMER_MONOTONIC. The rest may be 518 * allocated by the timer_create() syscall. 519 * 520 * Realtime timers are kept in the ptimer structure as an absolute 521 * time; virtual time timers are kept as a linked list of deltas. 522 * Virtual time timers are processed in the hardclock() routine of 523 * kern_clock.c. The real time timer is processed by a callout 524 * routine, called from the softclock() routine. Since a callout may 525 * be delayed in real time due to interrupt processing in the system, 526 * it is possible for the real time timeout routine (realtimeexpire, 527 * given below), to be delayed in real time past when it is supposed 528 * to occur. It does not suffice, therefore, to reload the real timer 529 * .it_value from the real time timers .it_interval. Rather, we 530 * compute the next time in absolute time the timer should go off. */ 531 532 /* Allocate a POSIX realtime timer. */ 533 int 534 sys_timer_create(struct lwp *l, const struct sys_timer_create_args *uap, 535 register_t *retval) 536 { 537 /* { 538 syscallarg(clockid_t) clock_id; 539 syscallarg(struct sigevent *) evp; 540 syscallarg(timer_t *) timerid; 541 } */ 542 543 return timer_create1(SCARG(uap, timerid), SCARG(uap, clock_id), 544 SCARG(uap, evp), copyin, l); 545 } 546 547 int 548 timer_create1(timer_t *tid, clockid_t id, struct sigevent *evp, 549 copyin_t fetch_event, struct lwp *l) 550 { 551 int error; 552 timer_t timerid; 553 struct ptimers *pts; 554 struct ptimer *pt; 555 struct proc *p; 556 557 p = l->l_proc; 558 559 if ((u_int)id > CLOCK_MONOTONIC) 560 return (EINVAL); 561 562 if ((pts = p->p_timers) == NULL) 563 pts = timers_alloc(p); 564 565 pt = pool_get(&ptimer_pool, PR_WAITOK); 566 if (evp != NULL) { 567 if (((error = 568 (*fetch_event)(evp, &pt->pt_ev, sizeof(pt->pt_ev))) != 0) || 569 ((pt->pt_ev.sigev_notify < SIGEV_NONE) || 570 (pt->pt_ev.sigev_notify > SIGEV_SA)) || 571 (pt->pt_ev.sigev_notify == SIGEV_SIGNAL && 572 (pt->pt_ev.sigev_signo <= 0 || 573 pt->pt_ev.sigev_signo >= NSIG))) { 574 pool_put(&ptimer_pool, pt); 575 return (error ? error : EINVAL); 576 } 577 } 578 579 /* Find a free timer slot, skipping those reserved for setitimer(). */ 580 mutex_spin_enter(&timer_lock); 581 for (timerid = 3; timerid < TIMER_MAX; timerid++) 582 if (pts->pts_timers[timerid] == NULL) 583 break; 584 if (timerid == TIMER_MAX) { 585 mutex_spin_exit(&timer_lock); 586 pool_put(&ptimer_pool, pt); 587 return EAGAIN; 588 } 589 if (evp == NULL) { 590 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 591 switch (id) { 592 case CLOCK_REALTIME: 593 case CLOCK_MONOTONIC: 594 pt->pt_ev.sigev_signo = SIGALRM; 595 break; 596 case CLOCK_VIRTUAL: 597 pt->pt_ev.sigev_signo = SIGVTALRM; 598 break; 599 case CLOCK_PROF: 600 pt->pt_ev.sigev_signo = SIGPROF; 601 break; 602 } 603 pt->pt_ev.sigev_value.sival_int = timerid; 604 } 605 pt->pt_info.ksi_signo = pt->pt_ev.sigev_signo; 606 pt->pt_info.ksi_errno = 0; 607 pt->pt_info.ksi_code = 0; 608 pt->pt_info.ksi_pid = p->p_pid; 609 pt->pt_info.ksi_uid = kauth_cred_getuid(l->l_cred); 610 pt->pt_info.ksi_value = pt->pt_ev.sigev_value; 611 pt->pt_type = id; 612 pt->pt_proc = p; 613 pt->pt_overruns = 0; 614 pt->pt_poverruns = 0; 615 pt->pt_entry = timerid; 616 pt->pt_queued = false; 617 timespecclear(&pt->pt_time.it_value); 618 if (!CLOCK_VIRTUAL_P(id)) 619 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 620 else 621 pt->pt_active = 0; 622 623 pts->pts_timers[timerid] = pt; 624 mutex_spin_exit(&timer_lock); 625 626 return copyout(&timerid, tid, sizeof(timerid)); 627 } 628 629 /* Delete a POSIX realtime timer */ 630 int 631 sys_timer_delete(struct lwp *l, const struct sys_timer_delete_args *uap, 632 register_t *retval) 633 { 634 /* { 635 syscallarg(timer_t) timerid; 636 } */ 637 struct proc *p = l->l_proc; 638 timer_t timerid; 639 struct ptimers *pts; 640 struct ptimer *pt, *ptn; 641 642 timerid = SCARG(uap, timerid); 643 pts = p->p_timers; 644 645 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 646 return (EINVAL); 647 648 mutex_spin_enter(&timer_lock); 649 if ((pt = pts->pts_timers[timerid]) == NULL) { 650 mutex_spin_exit(&timer_lock); 651 return (EINVAL); 652 } 653 if (CLOCK_VIRTUAL_P(pt->pt_type)) { 654 if (pt->pt_active) { 655 ptn = LIST_NEXT(pt, pt_list); 656 LIST_REMOVE(pt, pt_list); 657 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 658 timespecadd(&pt->pt_time.it_value, 659 &ptn->pt_time.it_value, 660 &ptn->pt_time.it_value); 661 pt->pt_active = 0; 662 } 663 } 664 itimerfree(pts, timerid); 665 666 return (0); 667 } 668 669 /* 670 * Set up the given timer. The value in pt->pt_time.it_value is taken 671 * to be an absolute time for CLOCK_REALTIME/CLOCK_MONOTONIC timers and 672 * a relative time for CLOCK_VIRTUAL/CLOCK_PROF timers. 673 */ 674 void 675 timer_settime(struct ptimer *pt) 676 { 677 struct ptimer *ptn, *pptn; 678 struct ptlist *ptl; 679 680 KASSERT(mutex_owned(&timer_lock)); 681 682 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 683 callout_halt(&pt->pt_ch, &timer_lock); 684 if (timespecisset(&pt->pt_time.it_value)) { 685 /* 686 * Don't need to check tshzto() return value, here. 687 * callout_reset() does it for us. 688 */ 689 callout_reset(&pt->pt_ch, 690 pt->pt_type == CLOCK_MONOTONIC ? 691 tshztoup(&pt->pt_time.it_value) : 692 tshzto(&pt->pt_time.it_value), 693 realtimerexpire, pt); 694 } 695 } else { 696 if (pt->pt_active) { 697 ptn = LIST_NEXT(pt, pt_list); 698 LIST_REMOVE(pt, pt_list); 699 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 700 timespecadd(&pt->pt_time.it_value, 701 &ptn->pt_time.it_value, 702 &ptn->pt_time.it_value); 703 } 704 if (timespecisset(&pt->pt_time.it_value)) { 705 if (pt->pt_type == CLOCK_VIRTUAL) 706 ptl = &pt->pt_proc->p_timers->pts_virtual; 707 else 708 ptl = &pt->pt_proc->p_timers->pts_prof; 709 710 for (ptn = LIST_FIRST(ptl), pptn = NULL; 711 ptn && timespeccmp(&pt->pt_time.it_value, 712 &ptn->pt_time.it_value, >); 713 pptn = ptn, ptn = LIST_NEXT(ptn, pt_list)) 714 timespecsub(&pt->pt_time.it_value, 715 &ptn->pt_time.it_value, 716 &pt->pt_time.it_value); 717 718 if (pptn) 719 LIST_INSERT_AFTER(pptn, pt, pt_list); 720 else 721 LIST_INSERT_HEAD(ptl, pt, pt_list); 722 723 for ( ; ptn ; ptn = LIST_NEXT(ptn, pt_list)) 724 timespecsub(&ptn->pt_time.it_value, 725 &pt->pt_time.it_value, 726 &ptn->pt_time.it_value); 727 728 pt->pt_active = 1; 729 } else 730 pt->pt_active = 0; 731 } 732 } 733 734 void 735 timer_gettime(struct ptimer *pt, struct itimerspec *aits) 736 { 737 struct timespec now; 738 struct ptimer *ptn; 739 740 KASSERT(mutex_owned(&timer_lock)); 741 742 *aits = pt->pt_time; 743 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 744 /* 745 * Convert from absolute to relative time in .it_value 746 * part of real time timer. If time for real time 747 * timer has passed return 0, else return difference 748 * between current time and time for the timer to go 749 * off. 750 */ 751 if (timespecisset(&aits->it_value)) { 752 if (pt->pt_type == CLOCK_REALTIME) { 753 getnanotime(&now); 754 } else { /* CLOCK_MONOTONIC */ 755 getnanouptime(&now); 756 } 757 if (timespeccmp(&aits->it_value, &now, <)) 758 timespecclear(&aits->it_value); 759 else 760 timespecsub(&aits->it_value, &now, 761 &aits->it_value); 762 } 763 } else if (pt->pt_active) { 764 if (pt->pt_type == CLOCK_VIRTUAL) 765 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_virtual); 766 else 767 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_prof); 768 for ( ; ptn && ptn != pt; ptn = LIST_NEXT(ptn, pt_list)) 769 timespecadd(&aits->it_value, 770 &ptn->pt_time.it_value, &aits->it_value); 771 KASSERT(ptn != NULL); /* pt should be findable on the list */ 772 } else 773 timespecclear(&aits->it_value); 774 } 775 776 777 778 /* Set and arm a POSIX realtime timer */ 779 int 780 sys___timer_settime50(struct lwp *l, 781 const struct sys___timer_settime50_args *uap, 782 register_t *retval) 783 { 784 /* { 785 syscallarg(timer_t) timerid; 786 syscallarg(int) flags; 787 syscallarg(const struct itimerspec *) value; 788 syscallarg(struct itimerspec *) ovalue; 789 } */ 790 int error; 791 struct itimerspec value, ovalue, *ovp = NULL; 792 793 if ((error = copyin(SCARG(uap, value), &value, 794 sizeof(struct itimerspec))) != 0) 795 return (error); 796 797 if (SCARG(uap, ovalue)) 798 ovp = &ovalue; 799 800 if ((error = dotimer_settime(SCARG(uap, timerid), &value, ovp, 801 SCARG(uap, flags), l->l_proc)) != 0) 802 return error; 803 804 if (ovp) 805 return copyout(&ovalue, SCARG(uap, ovalue), 806 sizeof(struct itimerspec)); 807 return 0; 808 } 809 810 int 811 dotimer_settime(int timerid, struct itimerspec *value, 812 struct itimerspec *ovalue, int flags, struct proc *p) 813 { 814 struct timespec now; 815 struct itimerspec val, oval; 816 struct ptimers *pts; 817 struct ptimer *pt; 818 int error; 819 820 pts = p->p_timers; 821 822 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 823 return EINVAL; 824 val = *value; 825 if ((error = itimespecfix(&val.it_value)) != 0 || 826 (error = itimespecfix(&val.it_interval)) != 0) 827 return error; 828 829 mutex_spin_enter(&timer_lock); 830 if ((pt = pts->pts_timers[timerid]) == NULL) { 831 mutex_spin_exit(&timer_lock); 832 return EINVAL; 833 } 834 835 oval = pt->pt_time; 836 pt->pt_time = val; 837 838 /* 839 * If we've been passed a relative time for a realtime timer, 840 * convert it to absolute; if an absolute time for a virtual 841 * timer, convert it to relative and make sure we don't set it 842 * to zero, which would cancel the timer, or let it go 843 * negative, which would confuse the comparison tests. 844 */ 845 if (timespecisset(&pt->pt_time.it_value)) { 846 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 847 if ((flags & TIMER_ABSTIME) == 0) { 848 if (pt->pt_type == CLOCK_REALTIME) { 849 getnanotime(&now); 850 } else { /* CLOCK_MONOTONIC */ 851 getnanouptime(&now); 852 } 853 timespecadd(&pt->pt_time.it_value, &now, 854 &pt->pt_time.it_value); 855 } 856 } else { 857 if ((flags & TIMER_ABSTIME) != 0) { 858 getnanotime(&now); 859 timespecsub(&pt->pt_time.it_value, &now, 860 &pt->pt_time.it_value); 861 if (!timespecisset(&pt->pt_time.it_value) || 862 pt->pt_time.it_value.tv_sec < 0) { 863 pt->pt_time.it_value.tv_sec = 0; 864 pt->pt_time.it_value.tv_nsec = 1; 865 } 866 } 867 } 868 } 869 870 timer_settime(pt); 871 mutex_spin_exit(&timer_lock); 872 873 if (ovalue) 874 *ovalue = oval; 875 876 return (0); 877 } 878 879 /* Return the time remaining until a POSIX timer fires. */ 880 int 881 sys___timer_gettime50(struct lwp *l, 882 const struct sys___timer_gettime50_args *uap, register_t *retval) 883 { 884 /* { 885 syscallarg(timer_t) timerid; 886 syscallarg(struct itimerspec *) value; 887 } */ 888 struct itimerspec its; 889 int error; 890 891 if ((error = dotimer_gettime(SCARG(uap, timerid), l->l_proc, 892 &its)) != 0) 893 return error; 894 895 return copyout(&its, SCARG(uap, value), sizeof(its)); 896 } 897 898 int 899 dotimer_gettime(int timerid, struct proc *p, struct itimerspec *its) 900 { 901 struct ptimer *pt; 902 struct ptimers *pts; 903 904 pts = p->p_timers; 905 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 906 return (EINVAL); 907 mutex_spin_enter(&timer_lock); 908 if ((pt = pts->pts_timers[timerid]) == NULL) { 909 mutex_spin_exit(&timer_lock); 910 return (EINVAL); 911 } 912 timer_gettime(pt, its); 913 mutex_spin_exit(&timer_lock); 914 915 return 0; 916 } 917 918 /* 919 * Return the count of the number of times a periodic timer expired 920 * while a notification was already pending. The counter is reset when 921 * a timer expires and a notification can be posted. 922 */ 923 int 924 sys_timer_getoverrun(struct lwp *l, const struct sys_timer_getoverrun_args *uap, 925 register_t *retval) 926 { 927 /* { 928 syscallarg(timer_t) timerid; 929 } */ 930 struct proc *p = l->l_proc; 931 struct ptimers *pts; 932 int timerid; 933 struct ptimer *pt; 934 935 timerid = SCARG(uap, timerid); 936 937 pts = p->p_timers; 938 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 939 return (EINVAL); 940 mutex_spin_enter(&timer_lock); 941 if ((pt = pts->pts_timers[timerid]) == NULL) { 942 mutex_spin_exit(&timer_lock); 943 return (EINVAL); 944 } 945 *retval = pt->pt_poverruns; 946 mutex_spin_exit(&timer_lock); 947 948 return (0); 949 } 950 951 /* 952 * Real interval timer expired: 953 * send process whose timer expired an alarm signal. 954 * If time is not set up to reload, then just return. 955 * Else compute next time timer should go off which is > current time. 956 * This is where delay in processing this timeout causes multiple 957 * SIGALRM calls to be compressed into one. 958 */ 959 void 960 realtimerexpire(void *arg) 961 { 962 uint64_t last_val, next_val, interval, now_ns; 963 struct timespec now, next; 964 struct ptimer *pt; 965 int backwards; 966 967 pt = arg; 968 969 mutex_spin_enter(&timer_lock); 970 itimerfire(pt); 971 972 if (!timespecisset(&pt->pt_time.it_interval)) { 973 timespecclear(&pt->pt_time.it_value); 974 mutex_spin_exit(&timer_lock); 975 return; 976 } 977 978 if (pt->pt_type == CLOCK_MONOTONIC) { 979 getnanouptime(&now); 980 } else { 981 getnanotime(&now); 982 } 983 backwards = (timespeccmp(&pt->pt_time.it_value, &now, >)); 984 timespecadd(&pt->pt_time.it_value, &pt->pt_time.it_interval, &next); 985 /* Handle the easy case of non-overflown timers first. */ 986 if (!backwards && timespeccmp(&next, &now, >)) { 987 pt->pt_time.it_value = next; 988 } else { 989 now_ns = timespec2ns(&now); 990 last_val = timespec2ns(&pt->pt_time.it_value); 991 interval = timespec2ns(&pt->pt_time.it_interval); 992 993 next_val = now_ns + 994 (now_ns - last_val + interval - 1) % interval; 995 996 if (backwards) 997 next_val += interval; 998 else 999 pt->pt_overruns += (now_ns - last_val) / interval; 1000 1001 pt->pt_time.it_value.tv_sec = next_val / 1000000000; 1002 pt->pt_time.it_value.tv_nsec = next_val % 1000000000; 1003 } 1004 1005 /* 1006 * Don't need to check tshzto() return value, here. 1007 * callout_reset() does it for us. 1008 */ 1009 callout_reset(&pt->pt_ch, pt->pt_type == CLOCK_MONOTONIC ? 1010 tshztoup(&pt->pt_time.it_value) : tshzto(&pt->pt_time.it_value), 1011 realtimerexpire, pt); 1012 mutex_spin_exit(&timer_lock); 1013 } 1014 1015 /* BSD routine to get the value of an interval timer. */ 1016 /* ARGSUSED */ 1017 int 1018 sys___getitimer50(struct lwp *l, const struct sys___getitimer50_args *uap, 1019 register_t *retval) 1020 { 1021 /* { 1022 syscallarg(int) which; 1023 syscallarg(struct itimerval *) itv; 1024 } */ 1025 struct proc *p = l->l_proc; 1026 struct itimerval aitv; 1027 int error; 1028 1029 error = dogetitimer(p, SCARG(uap, which), &aitv); 1030 if (error) 1031 return error; 1032 return (copyout(&aitv, SCARG(uap, itv), sizeof(struct itimerval))); 1033 } 1034 1035 int 1036 dogetitimer(struct proc *p, int which, struct itimerval *itvp) 1037 { 1038 struct ptimers *pts; 1039 struct ptimer *pt; 1040 struct itimerspec its; 1041 1042 if ((u_int)which > ITIMER_MONOTONIC) 1043 return (EINVAL); 1044 1045 mutex_spin_enter(&timer_lock); 1046 pts = p->p_timers; 1047 if (pts == NULL || (pt = pts->pts_timers[which]) == NULL) { 1048 timerclear(&itvp->it_value); 1049 timerclear(&itvp->it_interval); 1050 } else { 1051 timer_gettime(pt, &its); 1052 TIMESPEC_TO_TIMEVAL(&itvp->it_value, &its.it_value); 1053 TIMESPEC_TO_TIMEVAL(&itvp->it_interval, &its.it_interval); 1054 } 1055 mutex_spin_exit(&timer_lock); 1056 1057 return 0; 1058 } 1059 1060 /* BSD routine to set/arm an interval timer. */ 1061 /* ARGSUSED */ 1062 int 1063 sys___setitimer50(struct lwp *l, const struct sys___setitimer50_args *uap, 1064 register_t *retval) 1065 { 1066 /* { 1067 syscallarg(int) which; 1068 syscallarg(const struct itimerval *) itv; 1069 syscallarg(struct itimerval *) oitv; 1070 } */ 1071 struct proc *p = l->l_proc; 1072 int which = SCARG(uap, which); 1073 struct sys___getitimer50_args getargs; 1074 const struct itimerval *itvp; 1075 struct itimerval aitv; 1076 int error; 1077 1078 if ((u_int)which > ITIMER_MONOTONIC) 1079 return (EINVAL); 1080 itvp = SCARG(uap, itv); 1081 if (itvp && 1082 (error = copyin(itvp, &aitv, sizeof(struct itimerval))) != 0) 1083 return (error); 1084 if (SCARG(uap, oitv) != NULL) { 1085 SCARG(&getargs, which) = which; 1086 SCARG(&getargs, itv) = SCARG(uap, oitv); 1087 if ((error = sys___getitimer50(l, &getargs, retval)) != 0) 1088 return (error); 1089 } 1090 if (itvp == 0) 1091 return (0); 1092 1093 return dosetitimer(p, which, &aitv); 1094 } 1095 1096 int 1097 dosetitimer(struct proc *p, int which, struct itimerval *itvp) 1098 { 1099 struct timespec now; 1100 struct ptimers *pts; 1101 struct ptimer *pt, *spare; 1102 1103 KASSERT((u_int)which <= CLOCK_MONOTONIC); 1104 if (itimerfix(&itvp->it_value) || itimerfix(&itvp->it_interval)) 1105 return (EINVAL); 1106 1107 /* 1108 * Don't bother allocating data structures if the process just 1109 * wants to clear the timer. 1110 */ 1111 spare = NULL; 1112 pts = p->p_timers; 1113 retry: 1114 if (!timerisset(&itvp->it_value) && (pts == NULL || 1115 pts->pts_timers[which] == NULL)) 1116 return (0); 1117 if (pts == NULL) 1118 pts = timers_alloc(p); 1119 mutex_spin_enter(&timer_lock); 1120 pt = pts->pts_timers[which]; 1121 if (pt == NULL) { 1122 if (spare == NULL) { 1123 mutex_spin_exit(&timer_lock); 1124 spare = pool_get(&ptimer_pool, PR_WAITOK); 1125 goto retry; 1126 } 1127 pt = spare; 1128 spare = NULL; 1129 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 1130 pt->pt_ev.sigev_value.sival_int = which; 1131 pt->pt_overruns = 0; 1132 pt->pt_proc = p; 1133 pt->pt_type = which; 1134 pt->pt_entry = which; 1135 pt->pt_queued = false; 1136 if (pt->pt_type == CLOCK_REALTIME) 1137 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 1138 else 1139 pt->pt_active = 0; 1140 1141 switch (which) { 1142 case ITIMER_REAL: 1143 case ITIMER_MONOTONIC: 1144 pt->pt_ev.sigev_signo = SIGALRM; 1145 break; 1146 case ITIMER_VIRTUAL: 1147 pt->pt_ev.sigev_signo = SIGVTALRM; 1148 break; 1149 case ITIMER_PROF: 1150 pt->pt_ev.sigev_signo = SIGPROF; 1151 break; 1152 } 1153 pts->pts_timers[which] = pt; 1154 } 1155 1156 TIMEVAL_TO_TIMESPEC(&itvp->it_value, &pt->pt_time.it_value); 1157 TIMEVAL_TO_TIMESPEC(&itvp->it_interval, &pt->pt_time.it_interval); 1158 1159 if (timespecisset(&pt->pt_time.it_value)) { 1160 /* Convert to absolute time */ 1161 /* XXX need to wrap in splclock for timecounters case? */ 1162 switch (which) { 1163 case ITIMER_REAL: 1164 getnanotime(&now); 1165 timespecadd(&pt->pt_time.it_value, &now, 1166 &pt->pt_time.it_value); 1167 break; 1168 case ITIMER_MONOTONIC: 1169 getnanouptime(&now); 1170 timespecadd(&pt->pt_time.it_value, &now, 1171 &pt->pt_time.it_value); 1172 break; 1173 default: 1174 break; 1175 } 1176 } 1177 timer_settime(pt); 1178 mutex_spin_exit(&timer_lock); 1179 if (spare != NULL) 1180 pool_put(&ptimer_pool, spare); 1181 1182 return (0); 1183 } 1184 1185 /* Utility routines to manage the array of pointers to timers. */ 1186 struct ptimers * 1187 timers_alloc(struct proc *p) 1188 { 1189 struct ptimers *pts; 1190 int i; 1191 1192 pts = pool_get(&ptimers_pool, PR_WAITOK); 1193 LIST_INIT(&pts->pts_virtual); 1194 LIST_INIT(&pts->pts_prof); 1195 for (i = 0; i < TIMER_MAX; i++) 1196 pts->pts_timers[i] = NULL; 1197 pts->pts_fired = 0; 1198 mutex_spin_enter(&timer_lock); 1199 if (p->p_timers == NULL) { 1200 p->p_timers = pts; 1201 mutex_spin_exit(&timer_lock); 1202 return pts; 1203 } 1204 mutex_spin_exit(&timer_lock); 1205 pool_put(&ptimers_pool, pts); 1206 return p->p_timers; 1207 } 1208 1209 /* 1210 * Clean up the per-process timers. If "which" is set to TIMERS_ALL, 1211 * then clean up all timers and free all the data structures. If 1212 * "which" is set to TIMERS_POSIX, only clean up the timers allocated 1213 * by timer_create(), not the BSD setitimer() timers, and only free the 1214 * structure if none of those remain. 1215 */ 1216 void 1217 timers_free(struct proc *p, int which) 1218 { 1219 struct ptimers *pts; 1220 struct ptimer *ptn; 1221 struct timespec ts; 1222 int i; 1223 1224 if (p->p_timers == NULL) 1225 return; 1226 1227 pts = p->p_timers; 1228 mutex_spin_enter(&timer_lock); 1229 if (which == TIMERS_ALL) { 1230 p->p_timers = NULL; 1231 i = 0; 1232 } else { 1233 timespecclear(&ts); 1234 for (ptn = LIST_FIRST(&pts->pts_virtual); 1235 ptn && ptn != pts->pts_timers[ITIMER_VIRTUAL]; 1236 ptn = LIST_NEXT(ptn, pt_list)) { 1237 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1238 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1239 } 1240 LIST_FIRST(&pts->pts_virtual) = NULL; 1241 if (ptn) { 1242 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1243 timespecadd(&ts, &ptn->pt_time.it_value, 1244 &ptn->pt_time.it_value); 1245 LIST_INSERT_HEAD(&pts->pts_virtual, ptn, pt_list); 1246 } 1247 timespecclear(&ts); 1248 for (ptn = LIST_FIRST(&pts->pts_prof); 1249 ptn && ptn != pts->pts_timers[ITIMER_PROF]; 1250 ptn = LIST_NEXT(ptn, pt_list)) { 1251 KASSERT(ptn->pt_type == CLOCK_PROF); 1252 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1253 } 1254 LIST_FIRST(&pts->pts_prof) = NULL; 1255 if (ptn) { 1256 KASSERT(ptn->pt_type == CLOCK_PROF); 1257 timespecadd(&ts, &ptn->pt_time.it_value, 1258 &ptn->pt_time.it_value); 1259 LIST_INSERT_HEAD(&pts->pts_prof, ptn, pt_list); 1260 } 1261 i = 3; 1262 } 1263 for ( ; i < TIMER_MAX; i++) { 1264 if (pts->pts_timers[i] != NULL) { 1265 itimerfree(pts, i); 1266 mutex_spin_enter(&timer_lock); 1267 } 1268 } 1269 if (pts->pts_timers[0] == NULL && pts->pts_timers[1] == NULL && 1270 pts->pts_timers[2] == NULL) { 1271 p->p_timers = NULL; 1272 mutex_spin_exit(&timer_lock); 1273 pool_put(&ptimers_pool, pts); 1274 } else 1275 mutex_spin_exit(&timer_lock); 1276 } 1277 1278 static void 1279 itimerfree(struct ptimers *pts, int index) 1280 { 1281 struct ptimer *pt; 1282 1283 KASSERT(mutex_owned(&timer_lock)); 1284 1285 pt = pts->pts_timers[index]; 1286 pts->pts_timers[index] = NULL; 1287 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1288 callout_halt(&pt->pt_ch, &timer_lock); 1289 if (pt->pt_queued) 1290 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1291 mutex_spin_exit(&timer_lock); 1292 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1293 callout_destroy(&pt->pt_ch); 1294 pool_put(&ptimer_pool, pt); 1295 } 1296 1297 /* 1298 * Decrement an interval timer by a specified number 1299 * of nanoseconds, which must be less than a second, 1300 * i.e. < 1000000000. If the timer expires, then reload 1301 * it. In this case, carry over (nsec - old value) to 1302 * reduce the value reloaded into the timer so that 1303 * the timer does not drift. This routine assumes 1304 * that it is called in a context where the timers 1305 * on which it is operating cannot change in value. 1306 */ 1307 static int 1308 itimerdecr(struct ptimer *pt, int nsec) 1309 { 1310 struct itimerspec *itp; 1311 1312 KASSERT(mutex_owned(&timer_lock)); 1313 KASSERT(CLOCK_VIRTUAL_P(pt->pt_type)); 1314 1315 itp = &pt->pt_time; 1316 if (itp->it_value.tv_nsec < nsec) { 1317 if (itp->it_value.tv_sec == 0) { 1318 /* expired, and already in next interval */ 1319 nsec -= itp->it_value.tv_nsec; 1320 goto expire; 1321 } 1322 itp->it_value.tv_nsec += 1000000000; 1323 itp->it_value.tv_sec--; 1324 } 1325 itp->it_value.tv_nsec -= nsec; 1326 nsec = 0; 1327 if (timespecisset(&itp->it_value)) 1328 return (1); 1329 /* expired, exactly at end of interval */ 1330 expire: 1331 if (timespecisset(&itp->it_interval)) { 1332 itp->it_value = itp->it_interval; 1333 itp->it_value.tv_nsec -= nsec; 1334 if (itp->it_value.tv_nsec < 0) { 1335 itp->it_value.tv_nsec += 1000000000; 1336 itp->it_value.tv_sec--; 1337 } 1338 timer_settime(pt); 1339 } else 1340 itp->it_value.tv_nsec = 0; /* sec is already 0 */ 1341 return (0); 1342 } 1343 1344 static void 1345 itimerfire(struct ptimer *pt) 1346 { 1347 1348 KASSERT(mutex_owned(&timer_lock)); 1349 1350 /* 1351 * XXX Can overrun, but we don't do signal queueing yet, anyway. 1352 * XXX Relying on the clock interrupt is stupid. 1353 */ 1354 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL || pt->pt_queued) { 1355 return; 1356 } 1357 TAILQ_INSERT_TAIL(&timer_queue, pt, pt_chain); 1358 pt->pt_queued = true; 1359 softint_schedule(timer_sih); 1360 } 1361 1362 void 1363 timer_tick(lwp_t *l, bool user) 1364 { 1365 struct ptimers *pts; 1366 struct ptimer *pt; 1367 proc_t *p; 1368 1369 p = l->l_proc; 1370 if (p->p_timers == NULL) 1371 return; 1372 1373 mutex_spin_enter(&timer_lock); 1374 if ((pts = l->l_proc->p_timers) != NULL) { 1375 /* 1376 * Run current process's virtual and profile time, as needed. 1377 */ 1378 if (user && (pt = LIST_FIRST(&pts->pts_virtual)) != NULL) 1379 if (itimerdecr(pt, tick * 1000) == 0) 1380 itimerfire(pt); 1381 if ((pt = LIST_FIRST(&pts->pts_prof)) != NULL) 1382 if (itimerdecr(pt, tick * 1000) == 0) 1383 itimerfire(pt); 1384 } 1385 mutex_spin_exit(&timer_lock); 1386 } 1387 1388 static void 1389 timer_intr(void *cookie) 1390 { 1391 ksiginfo_t ksi; 1392 struct ptimer *pt; 1393 proc_t *p; 1394 1395 mutex_enter(proc_lock); 1396 mutex_spin_enter(&timer_lock); 1397 while ((pt = TAILQ_FIRST(&timer_queue)) != NULL) { 1398 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1399 KASSERT(pt->pt_queued); 1400 pt->pt_queued = false; 1401 1402 if (pt->pt_proc->p_timers == NULL) { 1403 /* Process is dying. */ 1404 continue; 1405 } 1406 p = pt->pt_proc; 1407 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL) { 1408 continue; 1409 } 1410 if (sigismember(&p->p_sigpend.sp_set, pt->pt_ev.sigev_signo)) { 1411 pt->pt_overruns++; 1412 continue; 1413 } 1414 1415 KSI_INIT(&ksi); 1416 ksi.ksi_signo = pt->pt_ev.sigev_signo; 1417 ksi.ksi_code = SI_TIMER; 1418 ksi.ksi_value = pt->pt_ev.sigev_value; 1419 pt->pt_poverruns = pt->pt_overruns; 1420 pt->pt_overruns = 0; 1421 mutex_spin_exit(&timer_lock); 1422 kpsignal(p, &ksi, NULL); 1423 mutex_spin_enter(&timer_lock); 1424 } 1425 mutex_spin_exit(&timer_lock); 1426 mutex_exit(proc_lock); 1427 } 1428 1429 /* 1430 * Check if the time will wrap if set to ts. 1431 * 1432 * ts - timespec describing the new time 1433 * delta - the delta between the current time and ts 1434 */ 1435 bool 1436 time_wraps(struct timespec *ts, struct timespec *delta) 1437 { 1438 1439 /* 1440 * Don't allow the time to be set forward so far it 1441 * will wrap and become negative, thus allowing an 1442 * attacker to bypass the next check below. The 1443 * cutoff is 1 year before rollover occurs, so even 1444 * if the attacker uses adjtime(2) to move the time 1445 * past the cutoff, it will take a very long time 1446 * to get to the wrap point. 1447 */ 1448 if ((ts->tv_sec > LLONG_MAX - 365*24*60*60) || 1449 (delta->tv_sec < 0 || delta->tv_nsec < 0)) 1450 return true; 1451 1452 return false; 1453 } 1454
Indexes created Mon Sep 29 21:09:56 GMT 2025