kern_time.c revision 1.179
1 /* $NetBSD: kern_time.c,v 1.179 2013/05/22 16:00:52 christos 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 2013/05/22 16:00:52 christos 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 return error == ETIMEDOUT ? 0 : error; 333 334 /* 335 * Avoid inadvertently sleeping forever 336 */ 337 if (timo == 0) 338 timo = 1; 339 again: 340 error = kpause("nanoslp", true, timo, NULL); 341 if (rmt != NULL || error == 0) { 342 struct timespec rmtend; 343 struct timespec t0; 344 struct timespec *t; 345 346 (void)clock_gettime1(clock_id, &rmtend); 347 t = (rmt != NULL) ? rmt : &t0; 348 if (flags & TIMER_ABSTIME) { 349 timespecsub(rqt, &rmtend, t); 350 } else { 351 timespecsub(&rmtend, &rmtstart, t); 352 timespecsub(rqt, t, t); 353 } 354 if (t->tv_sec < 0) 355 timespecclear(t); 356 if (error == 0) { 357 timo = tstohz(t); 358 if (timo > 0) 359 goto again; 360 } 361 } 362 363 if (error == ERESTART) 364 error = EINTR; 365 if (error == EWOULDBLOCK) 366 error = 0; 367 368 return error; 369 } 370 371 /* ARGSUSED */ 372 int 373 sys___gettimeofday50(struct lwp *l, const struct sys___gettimeofday50_args *uap, 374 register_t *retval) 375 { 376 /* { 377 syscallarg(struct timeval *) tp; 378 syscallarg(void *) tzp; really "struct timezone *"; 379 } */ 380 struct timeval atv; 381 int error = 0; 382 struct timezone tzfake; 383 384 if (SCARG(uap, tp)) { 385 microtime(&atv); 386 error = copyout(&atv, SCARG(uap, tp), sizeof(atv)); 387 if (error) 388 return (error); 389 } 390 if (SCARG(uap, tzp)) { 391 /* 392 * NetBSD has no kernel notion of time zone, so we just 393 * fake up a timezone struct and return it if demanded. 394 */ 395 tzfake.tz_minuteswest = 0; 396 tzfake.tz_dsttime = 0; 397 error = copyout(&tzfake, SCARG(uap, tzp), sizeof(tzfake)); 398 } 399 return (error); 400 } 401 402 /* ARGSUSED */ 403 int 404 sys___settimeofday50(struct lwp *l, const struct sys___settimeofday50_args *uap, 405 register_t *retval) 406 { 407 /* { 408 syscallarg(const struct timeval *) tv; 409 syscallarg(const void *) tzp; really "const struct timezone *"; 410 } */ 411 412 return settimeofday1(SCARG(uap, tv), true, SCARG(uap, tzp), l, true); 413 } 414 415 int 416 settimeofday1(const struct timeval *utv, bool userspace, 417 const void *utzp, struct lwp *l, bool check_kauth) 418 { 419 struct timeval atv; 420 struct timespec ts; 421 int error; 422 423 /* Verify all parameters before changing time. */ 424 425 /* 426 * NetBSD has no kernel notion of time zone, and only an 427 * obsolete program would try to set it, so we log a warning. 428 */ 429 if (utzp) 430 log(LOG_WARNING, "pid %d attempted to set the " 431 "(obsolete) kernel time zone\n", l->l_proc->p_pid); 432 433 if (utv == NULL) 434 return 0; 435 436 if (userspace) { 437 if ((error = copyin(utv, &atv, sizeof(atv))) != 0) 438 return error; 439 utv = &atv; 440 } 441 442 TIMEVAL_TO_TIMESPEC(utv, &ts); 443 return settime1(l->l_proc, &ts, check_kauth); 444 } 445 446 int time_adjusted; /* set if an adjustment is made */ 447 448 /* ARGSUSED */ 449 int 450 sys___adjtime50(struct lwp *l, const struct sys___adjtime50_args *uap, 451 register_t *retval) 452 { 453 /* { 454 syscallarg(const struct timeval *) delta; 455 syscallarg(struct timeval *) olddelta; 456 } */ 457 int error = 0; 458 struct timeval atv, oldatv; 459 460 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_TIME, 461 KAUTH_REQ_SYSTEM_TIME_ADJTIME, NULL, NULL, NULL)) != 0) 462 return error; 463 464 if (SCARG(uap, delta)) { 465 error = copyin(SCARG(uap, delta), &atv, 466 sizeof(*SCARG(uap, delta))); 467 if (error) 468 return (error); 469 } 470 adjtime1(SCARG(uap, delta) ? &atv : NULL, 471 SCARG(uap, olddelta) ? &oldatv : NULL, l->l_proc); 472 if (SCARG(uap, olddelta)) 473 error = copyout(&oldatv, SCARG(uap, olddelta), 474 sizeof(*SCARG(uap, olddelta))); 475 return error; 476 } 477 478 void 479 adjtime1(const struct timeval *delta, struct timeval *olddelta, struct proc *p) 480 { 481 extern int64_t time_adjtime; /* in kern_ntptime.c */ 482 483 if (olddelta) { 484 mutex_spin_enter(&timecounter_lock); 485 olddelta->tv_sec = time_adjtime / 1000000; 486 olddelta->tv_usec = time_adjtime % 1000000; 487 if (olddelta->tv_usec < 0) { 488 olddelta->tv_usec += 1000000; 489 olddelta->tv_sec--; 490 } 491 mutex_spin_exit(&timecounter_lock); 492 } 493 494 if (delta) { 495 mutex_spin_enter(&timecounter_lock); 496 time_adjtime = delta->tv_sec * 1000000 + delta->tv_usec; 497 498 if (time_adjtime) { 499 /* We need to save the system time during shutdown */ 500 time_adjusted |= 1; 501 } 502 mutex_spin_exit(&timecounter_lock); 503 } 504 } 505 506 /* 507 * Interval timer support. Both the BSD getitimer() family and the POSIX 508 * timer_*() family of routines are supported. 509 * 510 * All timers are kept in an array pointed to by p_timers, which is 511 * allocated on demand - many processes don't use timers at all. The 512 * first three elements in this array are reserved for the BSD timers: 513 * element 0 is ITIMER_REAL, element 1 is ITIMER_VIRTUAL, element 514 * 2 is ITIMER_PROF, and element 3 is ITIMER_MONOTONIC. The rest may be 515 * allocated by the timer_create() syscall. 516 * 517 * Realtime timers are kept in the ptimer structure as an absolute 518 * time; virtual time timers are kept as a linked list of deltas. 519 * Virtual time timers are processed in the hardclock() routine of 520 * kern_clock.c. The real time timer is processed by a callout 521 * routine, called from the softclock() routine. Since a callout may 522 * be delayed in real time due to interrupt processing in the system, 523 * it is possible for the real time timeout routine (realtimeexpire, 524 * given below), to be delayed in real time past when it is supposed 525 * to occur. It does not suffice, therefore, to reload the real timer 526 * .it_value from the real time timers .it_interval. Rather, we 527 * compute the next time in absolute time the timer should go off. */ 528 529 /* Allocate a POSIX realtime timer. */ 530 int 531 sys_timer_create(struct lwp *l, const struct sys_timer_create_args *uap, 532 register_t *retval) 533 { 534 /* { 535 syscallarg(clockid_t) clock_id; 536 syscallarg(struct sigevent *) evp; 537 syscallarg(timer_t *) timerid; 538 } */ 539 540 return timer_create1(SCARG(uap, timerid), SCARG(uap, clock_id), 541 SCARG(uap, evp), copyin, l); 542 } 543 544 int 545 timer_create1(timer_t *tid, clockid_t id, struct sigevent *evp, 546 copyin_t fetch_event, struct lwp *l) 547 { 548 int error; 549 timer_t timerid; 550 struct ptimers *pts; 551 struct ptimer *pt; 552 struct proc *p; 553 554 p = l->l_proc; 555 556 if ((u_int)id > CLOCK_MONOTONIC) 557 return (EINVAL); 558 559 if ((pts = p->p_timers) == NULL) 560 pts = timers_alloc(p); 561 562 pt = pool_get(&ptimer_pool, PR_WAITOK); 563 if (evp != NULL) { 564 if (((error = 565 (*fetch_event)(evp, &pt->pt_ev, sizeof(pt->pt_ev))) != 0) || 566 ((pt->pt_ev.sigev_notify < SIGEV_NONE) || 567 (pt->pt_ev.sigev_notify > SIGEV_SA)) || 568 (pt->pt_ev.sigev_notify == SIGEV_SIGNAL && 569 (pt->pt_ev.sigev_signo <= 0 || 570 pt->pt_ev.sigev_signo >= NSIG))) { 571 pool_put(&ptimer_pool, pt); 572 return (error ? error : EINVAL); 573 } 574 } 575 576 /* Find a free timer slot, skipping those reserved for setitimer(). */ 577 mutex_spin_enter(&timer_lock); 578 for (timerid = 3; timerid < TIMER_MAX; timerid++) 579 if (pts->pts_timers[timerid] == NULL) 580 break; 581 if (timerid == TIMER_MAX) { 582 mutex_spin_exit(&timer_lock); 583 pool_put(&ptimer_pool, pt); 584 return EAGAIN; 585 } 586 if (evp == NULL) { 587 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 588 switch (id) { 589 case CLOCK_REALTIME: 590 case CLOCK_MONOTONIC: 591 pt->pt_ev.sigev_signo = SIGALRM; 592 break; 593 case CLOCK_VIRTUAL: 594 pt->pt_ev.sigev_signo = SIGVTALRM; 595 break; 596 case CLOCK_PROF: 597 pt->pt_ev.sigev_signo = SIGPROF; 598 break; 599 } 600 pt->pt_ev.sigev_value.sival_int = timerid; 601 } 602 pt->pt_info.ksi_signo = pt->pt_ev.sigev_signo; 603 pt->pt_info.ksi_errno = 0; 604 pt->pt_info.ksi_code = 0; 605 pt->pt_info.ksi_pid = p->p_pid; 606 pt->pt_info.ksi_uid = kauth_cred_getuid(l->l_cred); 607 pt->pt_info.ksi_value = pt->pt_ev.sigev_value; 608 pt->pt_type = id; 609 pt->pt_proc = p; 610 pt->pt_overruns = 0; 611 pt->pt_poverruns = 0; 612 pt->pt_entry = timerid; 613 pt->pt_queued = false; 614 timespecclear(&pt->pt_time.it_value); 615 if (!CLOCK_VIRTUAL_P(id)) 616 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 617 else 618 pt->pt_active = 0; 619 620 pts->pts_timers[timerid] = pt; 621 mutex_spin_exit(&timer_lock); 622 623 return copyout(&timerid, tid, sizeof(timerid)); 624 } 625 626 /* Delete a POSIX realtime timer */ 627 int 628 sys_timer_delete(struct lwp *l, const struct sys_timer_delete_args *uap, 629 register_t *retval) 630 { 631 /* { 632 syscallarg(timer_t) timerid; 633 } */ 634 struct proc *p = l->l_proc; 635 timer_t timerid; 636 struct ptimers *pts; 637 struct ptimer *pt, *ptn; 638 639 timerid = SCARG(uap, timerid); 640 pts = p->p_timers; 641 642 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 643 return (EINVAL); 644 645 mutex_spin_enter(&timer_lock); 646 if ((pt = pts->pts_timers[timerid]) == NULL) { 647 mutex_spin_exit(&timer_lock); 648 return (EINVAL); 649 } 650 if (CLOCK_VIRTUAL_P(pt->pt_type)) { 651 if (pt->pt_active) { 652 ptn = LIST_NEXT(pt, pt_list); 653 LIST_REMOVE(pt, pt_list); 654 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 655 timespecadd(&pt->pt_time.it_value, 656 &ptn->pt_time.it_value, 657 &ptn->pt_time.it_value); 658 pt->pt_active = 0; 659 } 660 } 661 itimerfree(pts, timerid); 662 663 return (0); 664 } 665 666 /* 667 * Set up the given timer. The value in pt->pt_time.it_value is taken 668 * to be an absolute time for CLOCK_REALTIME/CLOCK_MONOTONIC timers and 669 * a relative time for CLOCK_VIRTUAL/CLOCK_PROF timers. 670 */ 671 void 672 timer_settime(struct ptimer *pt) 673 { 674 struct ptimer *ptn, *pptn; 675 struct ptlist *ptl; 676 677 KASSERT(mutex_owned(&timer_lock)); 678 679 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 680 callout_halt(&pt->pt_ch, &timer_lock); 681 if (timespecisset(&pt->pt_time.it_value)) { 682 /* 683 * Don't need to check tshzto() return value, here. 684 * callout_reset() does it for us. 685 */ 686 callout_reset(&pt->pt_ch, 687 pt->pt_type == CLOCK_MONOTONIC ? 688 tshztoup(&pt->pt_time.it_value) : 689 tshzto(&pt->pt_time.it_value), 690 realtimerexpire, pt); 691 } 692 } else { 693 if (pt->pt_active) { 694 ptn = LIST_NEXT(pt, pt_list); 695 LIST_REMOVE(pt, pt_list); 696 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 697 timespecadd(&pt->pt_time.it_value, 698 &ptn->pt_time.it_value, 699 &ptn->pt_time.it_value); 700 } 701 if (timespecisset(&pt->pt_time.it_value)) { 702 if (pt->pt_type == CLOCK_VIRTUAL) 703 ptl = &pt->pt_proc->p_timers->pts_virtual; 704 else 705 ptl = &pt->pt_proc->p_timers->pts_prof; 706 707 for (ptn = LIST_FIRST(ptl), pptn = NULL; 708 ptn && timespeccmp(&pt->pt_time.it_value, 709 &ptn->pt_time.it_value, >); 710 pptn = ptn, ptn = LIST_NEXT(ptn, pt_list)) 711 timespecsub(&pt->pt_time.it_value, 712 &ptn->pt_time.it_value, 713 &pt->pt_time.it_value); 714 715 if (pptn) 716 LIST_INSERT_AFTER(pptn, pt, pt_list); 717 else 718 LIST_INSERT_HEAD(ptl, pt, pt_list); 719 720 for ( ; ptn ; ptn = LIST_NEXT(ptn, pt_list)) 721 timespecsub(&ptn->pt_time.it_value, 722 &pt->pt_time.it_value, 723 &ptn->pt_time.it_value); 724 725 pt->pt_active = 1; 726 } else 727 pt->pt_active = 0; 728 } 729 } 730 731 void 732 timer_gettime(struct ptimer *pt, struct itimerspec *aits) 733 { 734 struct timespec now; 735 struct ptimer *ptn; 736 737 KASSERT(mutex_owned(&timer_lock)); 738 739 *aits = pt->pt_time; 740 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 741 /* 742 * Convert from absolute to relative time in .it_value 743 * part of real time timer. If time for real time 744 * timer has passed return 0, else return difference 745 * between current time and time for the timer to go 746 * off. 747 */ 748 if (timespecisset(&aits->it_value)) { 749 if (pt->pt_type == CLOCK_REALTIME) { 750 getnanotime(&now); 751 } else { /* CLOCK_MONOTONIC */ 752 getnanouptime(&now); 753 } 754 if (timespeccmp(&aits->it_value, &now, <)) 755 timespecclear(&aits->it_value); 756 else 757 timespecsub(&aits->it_value, &now, 758 &aits->it_value); 759 } 760 } else if (pt->pt_active) { 761 if (pt->pt_type == CLOCK_VIRTUAL) 762 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_virtual); 763 else 764 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_prof); 765 for ( ; ptn && ptn != pt; ptn = LIST_NEXT(ptn, pt_list)) 766 timespecadd(&aits->it_value, 767 &ptn->pt_time.it_value, &aits->it_value); 768 KASSERT(ptn != NULL); /* pt should be findable on the list */ 769 } else 770 timespecclear(&aits->it_value); 771 } 772 773 774 775 /* Set and arm a POSIX realtime timer */ 776 int 777 sys___timer_settime50(struct lwp *l, 778 const struct sys___timer_settime50_args *uap, 779 register_t *retval) 780 { 781 /* { 782 syscallarg(timer_t) timerid; 783 syscallarg(int) flags; 784 syscallarg(const struct itimerspec *) value; 785 syscallarg(struct itimerspec *) ovalue; 786 } */ 787 int error; 788 struct itimerspec value, ovalue, *ovp = NULL; 789 790 if ((error = copyin(SCARG(uap, value), &value, 791 sizeof(struct itimerspec))) != 0) 792 return (error); 793 794 if (SCARG(uap, ovalue)) 795 ovp = &ovalue; 796 797 if ((error = dotimer_settime(SCARG(uap, timerid), &value, ovp, 798 SCARG(uap, flags), l->l_proc)) != 0) 799 return error; 800 801 if (ovp) 802 return copyout(&ovalue, SCARG(uap, ovalue), 803 sizeof(struct itimerspec)); 804 return 0; 805 } 806 807 int 808 dotimer_settime(int timerid, struct itimerspec *value, 809 struct itimerspec *ovalue, int flags, struct proc *p) 810 { 811 struct timespec now; 812 struct itimerspec val, oval; 813 struct ptimers *pts; 814 struct ptimer *pt; 815 int error; 816 817 pts = p->p_timers; 818 819 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 820 return EINVAL; 821 val = *value; 822 if ((error = itimespecfix(&val.it_value)) != 0 || 823 (error = itimespecfix(&val.it_interval)) != 0) 824 return error; 825 826 mutex_spin_enter(&timer_lock); 827 if ((pt = pts->pts_timers[timerid]) == NULL) { 828 mutex_spin_exit(&timer_lock); 829 return EINVAL; 830 } 831 832 oval = pt->pt_time; 833 pt->pt_time = val; 834 835 /* 836 * If we've been passed a relative time for a realtime timer, 837 * convert it to absolute; if an absolute time for a virtual 838 * timer, convert it to relative and make sure we don't set it 839 * to zero, which would cancel the timer, or let it go 840 * negative, which would confuse the comparison tests. 841 */ 842 if (timespecisset(&pt->pt_time.it_value)) { 843 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 844 if ((flags & TIMER_ABSTIME) == 0) { 845 if (pt->pt_type == CLOCK_REALTIME) { 846 getnanotime(&now); 847 } else { /* CLOCK_MONOTONIC */ 848 getnanouptime(&now); 849 } 850 timespecadd(&pt->pt_time.it_value, &now, 851 &pt->pt_time.it_value); 852 } 853 } else { 854 if ((flags & TIMER_ABSTIME) != 0) { 855 getnanotime(&now); 856 timespecsub(&pt->pt_time.it_value, &now, 857 &pt->pt_time.it_value); 858 if (!timespecisset(&pt->pt_time.it_value) || 859 pt->pt_time.it_value.tv_sec < 0) { 860 pt->pt_time.it_value.tv_sec = 0; 861 pt->pt_time.it_value.tv_nsec = 1; 862 } 863 } 864 } 865 } 866 867 timer_settime(pt); 868 mutex_spin_exit(&timer_lock); 869 870 if (ovalue) 871 *ovalue = oval; 872 873 return (0); 874 } 875 876 /* Return the time remaining until a POSIX timer fires. */ 877 int 878 sys___timer_gettime50(struct lwp *l, 879 const struct sys___timer_gettime50_args *uap, register_t *retval) 880 { 881 /* { 882 syscallarg(timer_t) timerid; 883 syscallarg(struct itimerspec *) value; 884 } */ 885 struct itimerspec its; 886 int error; 887 888 if ((error = dotimer_gettime(SCARG(uap, timerid), l->l_proc, 889 &its)) != 0) 890 return error; 891 892 return copyout(&its, SCARG(uap, value), sizeof(its)); 893 } 894 895 int 896 dotimer_gettime(int timerid, struct proc *p, struct itimerspec *its) 897 { 898 struct ptimer *pt; 899 struct ptimers *pts; 900 901 pts = p->p_timers; 902 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 903 return (EINVAL); 904 mutex_spin_enter(&timer_lock); 905 if ((pt = pts->pts_timers[timerid]) == NULL) { 906 mutex_spin_exit(&timer_lock); 907 return (EINVAL); 908 } 909 timer_gettime(pt, its); 910 mutex_spin_exit(&timer_lock); 911 912 return 0; 913 } 914 915 /* 916 * Return the count of the number of times a periodic timer expired 917 * while a notification was already pending. The counter is reset when 918 * a timer expires and a notification can be posted. 919 */ 920 int 921 sys_timer_getoverrun(struct lwp *l, const struct sys_timer_getoverrun_args *uap, 922 register_t *retval) 923 { 924 /* { 925 syscallarg(timer_t) timerid; 926 } */ 927 struct proc *p = l->l_proc; 928 struct ptimers *pts; 929 int timerid; 930 struct ptimer *pt; 931 932 timerid = SCARG(uap, timerid); 933 934 pts = p->p_timers; 935 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 936 return (EINVAL); 937 mutex_spin_enter(&timer_lock); 938 if ((pt = pts->pts_timers[timerid]) == NULL) { 939 mutex_spin_exit(&timer_lock); 940 return (EINVAL); 941 } 942 *retval = pt->pt_poverruns; 943 mutex_spin_exit(&timer_lock); 944 945 return (0); 946 } 947 948 /* 949 * Real interval timer expired: 950 * send process whose timer expired an alarm signal. 951 * If time is not set up to reload, then just return. 952 * Else compute next time timer should go off which is > current time. 953 * This is where delay in processing this timeout causes multiple 954 * SIGALRM calls to be compressed into one. 955 */ 956 void 957 realtimerexpire(void *arg) 958 { 959 uint64_t last_val, next_val, interval, now_ns; 960 struct timespec now, next; 961 struct ptimer *pt; 962 int backwards; 963 964 pt = arg; 965 966 mutex_spin_enter(&timer_lock); 967 itimerfire(pt); 968 969 if (!timespecisset(&pt->pt_time.it_interval)) { 970 timespecclear(&pt->pt_time.it_value); 971 mutex_spin_exit(&timer_lock); 972 return; 973 } 974 975 if (pt->pt_type == CLOCK_MONOTONIC) { 976 getnanouptime(&now); 977 } else { 978 getnanotime(&now); 979 } 980 backwards = (timespeccmp(&pt->pt_time.it_value, &now, >)); 981 timespecadd(&pt->pt_time.it_value, &pt->pt_time.it_interval, &next); 982 /* Handle the easy case of non-overflown timers first. */ 983 if (!backwards && timespeccmp(&next, &now, >)) { 984 pt->pt_time.it_value = next; 985 } else { 986 now_ns = timespec2ns(&now); 987 last_val = timespec2ns(&pt->pt_time.it_value); 988 interval = timespec2ns(&pt->pt_time.it_interval); 989 990 next_val = now_ns + 991 (now_ns - last_val + interval - 1) % interval; 992 993 if (backwards) 994 next_val += interval; 995 else 996 pt->pt_overruns += (now_ns - last_val) / interval; 997 998 pt->pt_time.it_value.tv_sec = next_val / 1000000000; 999 pt->pt_time.it_value.tv_nsec = next_val % 1000000000; 1000 } 1001 1002 /* 1003 * Don't need to check tshzto() return value, here. 1004 * callout_reset() does it for us. 1005 */ 1006 callout_reset(&pt->pt_ch, pt->pt_type == CLOCK_MONOTONIC ? 1007 tshztoup(&pt->pt_time.it_value) : tshzto(&pt->pt_time.it_value), 1008 realtimerexpire, pt); 1009 mutex_spin_exit(&timer_lock); 1010 } 1011 1012 /* BSD routine to get the value of an interval timer. */ 1013 /* ARGSUSED */ 1014 int 1015 sys___getitimer50(struct lwp *l, const struct sys___getitimer50_args *uap, 1016 register_t *retval) 1017 { 1018 /* { 1019 syscallarg(int) which; 1020 syscallarg(struct itimerval *) itv; 1021 } */ 1022 struct proc *p = l->l_proc; 1023 struct itimerval aitv; 1024 int error; 1025 1026 error = dogetitimer(p, SCARG(uap, which), &aitv); 1027 if (error) 1028 return error; 1029 return (copyout(&aitv, SCARG(uap, itv), sizeof(struct itimerval))); 1030 } 1031 1032 int 1033 dogetitimer(struct proc *p, int which, struct itimerval *itvp) 1034 { 1035 struct ptimers *pts; 1036 struct ptimer *pt; 1037 struct itimerspec its; 1038 1039 if ((u_int)which > ITIMER_MONOTONIC) 1040 return (EINVAL); 1041 1042 mutex_spin_enter(&timer_lock); 1043 pts = p->p_timers; 1044 if (pts == NULL || (pt = pts->pts_timers[which]) == NULL) { 1045 timerclear(&itvp->it_value); 1046 timerclear(&itvp->it_interval); 1047 } else { 1048 timer_gettime(pt, &its); 1049 TIMESPEC_TO_TIMEVAL(&itvp->it_value, &its.it_value); 1050 TIMESPEC_TO_TIMEVAL(&itvp->it_interval, &its.it_interval); 1051 } 1052 mutex_spin_exit(&timer_lock); 1053 1054 return 0; 1055 } 1056 1057 /* BSD routine to set/arm an interval timer. */ 1058 /* ARGSUSED */ 1059 int 1060 sys___setitimer50(struct lwp *l, const struct sys___setitimer50_args *uap, 1061 register_t *retval) 1062 { 1063 /* { 1064 syscallarg(int) which; 1065 syscallarg(const struct itimerval *) itv; 1066 syscallarg(struct itimerval *) oitv; 1067 } */ 1068 struct proc *p = l->l_proc; 1069 int which = SCARG(uap, which); 1070 struct sys___getitimer50_args getargs; 1071 const struct itimerval *itvp; 1072 struct itimerval aitv; 1073 int error; 1074 1075 if ((u_int)which > ITIMER_MONOTONIC) 1076 return (EINVAL); 1077 itvp = SCARG(uap, itv); 1078 if (itvp && 1079 (error = copyin(itvp, &aitv, sizeof(struct itimerval))) != 0) 1080 return (error); 1081 if (SCARG(uap, oitv) != NULL) { 1082 SCARG(&getargs, which) = which; 1083 SCARG(&getargs, itv) = SCARG(uap, oitv); 1084 if ((error = sys___getitimer50(l, &getargs, retval)) != 0) 1085 return (error); 1086 } 1087 if (itvp == 0) 1088 return (0); 1089 1090 return dosetitimer(p, which, &aitv); 1091 } 1092 1093 int 1094 dosetitimer(struct proc *p, int which, struct itimerval *itvp) 1095 { 1096 struct timespec now; 1097 struct ptimers *pts; 1098 struct ptimer *pt, *spare; 1099 1100 KASSERT((u_int)which <= CLOCK_MONOTONIC); 1101 if (itimerfix(&itvp->it_value) || itimerfix(&itvp->it_interval)) 1102 return (EINVAL); 1103 1104 /* 1105 * Don't bother allocating data structures if the process just 1106 * wants to clear the timer. 1107 */ 1108 spare = NULL; 1109 pts = p->p_timers; 1110 retry: 1111 if (!timerisset(&itvp->it_value) && (pts == NULL || 1112 pts->pts_timers[which] == NULL)) 1113 return (0); 1114 if (pts == NULL) 1115 pts = timers_alloc(p); 1116 mutex_spin_enter(&timer_lock); 1117 pt = pts->pts_timers[which]; 1118 if (pt == NULL) { 1119 if (spare == NULL) { 1120 mutex_spin_exit(&timer_lock); 1121 spare = pool_get(&ptimer_pool, PR_WAITOK); 1122 goto retry; 1123 } 1124 pt = spare; 1125 spare = NULL; 1126 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 1127 pt->pt_ev.sigev_value.sival_int = which; 1128 pt->pt_overruns = 0; 1129 pt->pt_proc = p; 1130 pt->pt_type = which; 1131 pt->pt_entry = which; 1132 pt->pt_queued = false; 1133 if (pt->pt_type == CLOCK_REALTIME) 1134 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 1135 else 1136 pt->pt_active = 0; 1137 1138 switch (which) { 1139 case ITIMER_REAL: 1140 case ITIMER_MONOTONIC: 1141 pt->pt_ev.sigev_signo = SIGALRM; 1142 break; 1143 case ITIMER_VIRTUAL: 1144 pt->pt_ev.sigev_signo = SIGVTALRM; 1145 break; 1146 case ITIMER_PROF: 1147 pt->pt_ev.sigev_signo = SIGPROF; 1148 break; 1149 } 1150 pts->pts_timers[which] = pt; 1151 } 1152 1153 TIMEVAL_TO_TIMESPEC(&itvp->it_value, &pt->pt_time.it_value); 1154 TIMEVAL_TO_TIMESPEC(&itvp->it_interval, &pt->pt_time.it_interval); 1155 1156 if (timespecisset(&pt->pt_time.it_value)) { 1157 /* Convert to absolute time */ 1158 /* XXX need to wrap in splclock for timecounters case? */ 1159 switch (which) { 1160 case ITIMER_REAL: 1161 getnanotime(&now); 1162 timespecadd(&pt->pt_time.it_value, &now, 1163 &pt->pt_time.it_value); 1164 break; 1165 case ITIMER_MONOTONIC: 1166 getnanouptime(&now); 1167 timespecadd(&pt->pt_time.it_value, &now, 1168 &pt->pt_time.it_value); 1169 break; 1170 default: 1171 break; 1172 } 1173 } 1174 timer_settime(pt); 1175 mutex_spin_exit(&timer_lock); 1176 if (spare != NULL) 1177 pool_put(&ptimer_pool, spare); 1178 1179 return (0); 1180 } 1181 1182 /* Utility routines to manage the array of pointers to timers. */ 1183 struct ptimers * 1184 timers_alloc(struct proc *p) 1185 { 1186 struct ptimers *pts; 1187 int i; 1188 1189 pts = pool_get(&ptimers_pool, PR_WAITOK); 1190 LIST_INIT(&pts->pts_virtual); 1191 LIST_INIT(&pts->pts_prof); 1192 for (i = 0; i < TIMER_MAX; i++) 1193 pts->pts_timers[i] = NULL; 1194 pts->pts_fired = 0; 1195 mutex_spin_enter(&timer_lock); 1196 if (p->p_timers == NULL) { 1197 p->p_timers = pts; 1198 mutex_spin_exit(&timer_lock); 1199 return pts; 1200 } 1201 mutex_spin_exit(&timer_lock); 1202 pool_put(&ptimers_pool, pts); 1203 return p->p_timers; 1204 } 1205 1206 /* 1207 * Clean up the per-process timers. If "which" is set to TIMERS_ALL, 1208 * then clean up all timers and free all the data structures. If 1209 * "which" is set to TIMERS_POSIX, only clean up the timers allocated 1210 * by timer_create(), not the BSD setitimer() timers, and only free the 1211 * structure if none of those remain. 1212 */ 1213 void 1214 timers_free(struct proc *p, int which) 1215 { 1216 struct ptimers *pts; 1217 struct ptimer *ptn; 1218 struct timespec ts; 1219 int i; 1220 1221 if (p->p_timers == NULL) 1222 return; 1223 1224 pts = p->p_timers; 1225 mutex_spin_enter(&timer_lock); 1226 if (which == TIMERS_ALL) { 1227 p->p_timers = NULL; 1228 i = 0; 1229 } else { 1230 timespecclear(&ts); 1231 for (ptn = LIST_FIRST(&pts->pts_virtual); 1232 ptn && ptn != pts->pts_timers[ITIMER_VIRTUAL]; 1233 ptn = LIST_NEXT(ptn, pt_list)) { 1234 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1235 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1236 } 1237 LIST_FIRST(&pts->pts_virtual) = NULL; 1238 if (ptn) { 1239 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1240 timespecadd(&ts, &ptn->pt_time.it_value, 1241 &ptn->pt_time.it_value); 1242 LIST_INSERT_HEAD(&pts->pts_virtual, ptn, pt_list); 1243 } 1244 timespecclear(&ts); 1245 for (ptn = LIST_FIRST(&pts->pts_prof); 1246 ptn && ptn != pts->pts_timers[ITIMER_PROF]; 1247 ptn = LIST_NEXT(ptn, pt_list)) { 1248 KASSERT(ptn->pt_type == CLOCK_PROF); 1249 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1250 } 1251 LIST_FIRST(&pts->pts_prof) = NULL; 1252 if (ptn) { 1253 KASSERT(ptn->pt_type == CLOCK_PROF); 1254 timespecadd(&ts, &ptn->pt_time.it_value, 1255 &ptn->pt_time.it_value); 1256 LIST_INSERT_HEAD(&pts->pts_prof, ptn, pt_list); 1257 } 1258 i = 3; 1259 } 1260 for ( ; i < TIMER_MAX; i++) { 1261 if (pts->pts_timers[i] != NULL) { 1262 itimerfree(pts, i); 1263 mutex_spin_enter(&timer_lock); 1264 } 1265 } 1266 if (pts->pts_timers[0] == NULL && pts->pts_timers[1] == NULL && 1267 pts->pts_timers[2] == NULL) { 1268 p->p_timers = NULL; 1269 mutex_spin_exit(&timer_lock); 1270 pool_put(&ptimers_pool, pts); 1271 } else 1272 mutex_spin_exit(&timer_lock); 1273 } 1274 1275 static void 1276 itimerfree(struct ptimers *pts, int index) 1277 { 1278 struct ptimer *pt; 1279 1280 KASSERT(mutex_owned(&timer_lock)); 1281 1282 pt = pts->pts_timers[index]; 1283 pts->pts_timers[index] = NULL; 1284 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1285 callout_halt(&pt->pt_ch, &timer_lock); 1286 if (pt->pt_queued) 1287 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1288 mutex_spin_exit(&timer_lock); 1289 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1290 callout_destroy(&pt->pt_ch); 1291 pool_put(&ptimer_pool, pt); 1292 } 1293 1294 /* 1295 * Decrement an interval timer by a specified number 1296 * of nanoseconds, which must be less than a second, 1297 * i.e. < 1000000000. If the timer expires, then reload 1298 * it. In this case, carry over (nsec - old value) to 1299 * reduce the value reloaded into the timer so that 1300 * the timer does not drift. This routine assumes 1301 * that it is called in a context where the timers 1302 * on which it is operating cannot change in value. 1303 */ 1304 static int 1305 itimerdecr(struct ptimer *pt, int nsec) 1306 { 1307 struct itimerspec *itp; 1308 1309 KASSERT(mutex_owned(&timer_lock)); 1310 KASSERT(CLOCK_VIRTUAL_P(pt->pt_type)); 1311 1312 itp = &pt->pt_time; 1313 if (itp->it_value.tv_nsec < nsec) { 1314 if (itp->it_value.tv_sec == 0) { 1315 /* expired, and already in next interval */ 1316 nsec -= itp->it_value.tv_nsec; 1317 goto expire; 1318 } 1319 itp->it_value.tv_nsec += 1000000000; 1320 itp->it_value.tv_sec--; 1321 } 1322 itp->it_value.tv_nsec -= nsec; 1323 nsec = 0; 1324 if (timespecisset(&itp->it_value)) 1325 return (1); 1326 /* expired, exactly at end of interval */ 1327 expire: 1328 if (timespecisset(&itp->it_interval)) { 1329 itp->it_value = itp->it_interval; 1330 itp->it_value.tv_nsec -= nsec; 1331 if (itp->it_value.tv_nsec < 0) { 1332 itp->it_value.tv_nsec += 1000000000; 1333 itp->it_value.tv_sec--; 1334 } 1335 timer_settime(pt); 1336 } else 1337 itp->it_value.tv_nsec = 0; /* sec is already 0 */ 1338 return (0); 1339 } 1340 1341 static void 1342 itimerfire(struct ptimer *pt) 1343 { 1344 1345 KASSERT(mutex_owned(&timer_lock)); 1346 1347 /* 1348 * XXX Can overrun, but we don't do signal queueing yet, anyway. 1349 * XXX Relying on the clock interrupt is stupid. 1350 */ 1351 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL || pt->pt_queued) { 1352 return; 1353 } 1354 TAILQ_INSERT_TAIL(&timer_queue, pt, pt_chain); 1355 pt->pt_queued = true; 1356 softint_schedule(timer_sih); 1357 } 1358 1359 void 1360 timer_tick(lwp_t *l, bool user) 1361 { 1362 struct ptimers *pts; 1363 struct ptimer *pt; 1364 proc_t *p; 1365 1366 p = l->l_proc; 1367 if (p->p_timers == NULL) 1368 return; 1369 1370 mutex_spin_enter(&timer_lock); 1371 if ((pts = l->l_proc->p_timers) != NULL) { 1372 /* 1373 * Run current process's virtual and profile time, as needed. 1374 */ 1375 if (user && (pt = LIST_FIRST(&pts->pts_virtual)) != NULL) 1376 if (itimerdecr(pt, tick * 1000) == 0) 1377 itimerfire(pt); 1378 if ((pt = LIST_FIRST(&pts->pts_prof)) != NULL) 1379 if (itimerdecr(pt, tick * 1000) == 0) 1380 itimerfire(pt); 1381 } 1382 mutex_spin_exit(&timer_lock); 1383 } 1384 1385 static void 1386 timer_intr(void *cookie) 1387 { 1388 ksiginfo_t ksi; 1389 struct ptimer *pt; 1390 proc_t *p; 1391 1392 mutex_enter(proc_lock); 1393 mutex_spin_enter(&timer_lock); 1394 while ((pt = TAILQ_FIRST(&timer_queue)) != NULL) { 1395 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1396 KASSERT(pt->pt_queued); 1397 pt->pt_queued = false; 1398 1399 if (pt->pt_proc->p_timers == NULL) { 1400 /* Process is dying. */ 1401 continue; 1402 } 1403 p = pt->pt_proc; 1404 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL) { 1405 continue; 1406 } 1407 if (sigismember(&p->p_sigpend.sp_set, pt->pt_ev.sigev_signo)) { 1408 pt->pt_overruns++; 1409 continue; 1410 } 1411 1412 KSI_INIT(&ksi); 1413 ksi.ksi_signo = pt->pt_ev.sigev_signo; 1414 ksi.ksi_code = SI_TIMER; 1415 ksi.ksi_value = pt->pt_ev.sigev_value; 1416 pt->pt_poverruns = pt->pt_overruns; 1417 pt->pt_overruns = 0; 1418 mutex_spin_exit(&timer_lock); 1419 kpsignal(p, &ksi, NULL); 1420 mutex_spin_enter(&timer_lock); 1421 } 1422 mutex_spin_exit(&timer_lock); 1423 mutex_exit(proc_lock); 1424 } 1425 1426 /* 1427 * Check if the time will wrap if set to ts. 1428 * 1429 * ts - timespec describing the new time 1430 * delta - the delta between the current time and ts 1431 */ 1432 bool 1433 time_wraps(struct timespec *ts, struct timespec *delta) 1434 { 1435 1436 /* 1437 * Don't allow the time to be set forward so far it 1438 * will wrap and become negative, thus allowing an 1439 * attacker to bypass the next check below. The 1440 * cutoff is 1 year before rollover occurs, so even 1441 * if the attacker uses adjtime(2) to move the time 1442 * past the cutoff, it will take a very long time 1443 * to get to the wrap point. 1444 */ 1445 if ((ts->tv_sec > LLONG_MAX - 365*24*60*60) || 1446 (delta->tv_sec < 0 || delta->tv_nsec < 0)) 1447 return true; 1448 1449 return false; 1450 } 1451
Indexes created Thu Sep 25 08:09:54 GMT 2025