kern_time.c revision 1.197
1 /* $NetBSD: kern_time.c,v 1.197 2019/03/10 14:45:53 kre 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 1.197 2019/03/10 14:45:53 kre 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 #define DELAYTIMER_MAX 32 101 102 /* 103 * Initialize timekeeping. 104 */ 105 void 106 time_init(void) 107 { 108 109 pool_init(&ptimer_pool, sizeof(struct ptimer), 0, 0, 0, "ptimerpl", 110 &pool_allocator_nointr, IPL_NONE); 111 pool_init(&ptimers_pool, sizeof(struct ptimers), 0, 0, 0, "ptimerspl", 112 &pool_allocator_nointr, IPL_NONE); 113 } 114 115 void 116 time_init2(void) 117 { 118 119 TAILQ_INIT(&timer_queue); 120 mutex_init(&timer_lock, MUTEX_DEFAULT, IPL_SCHED); 121 timer_sih = softint_establish(SOFTINT_CLOCK | SOFTINT_MPSAFE, 122 timer_intr, NULL); 123 } 124 125 /* Time of day and interval timer support. 126 * 127 * These routines provide the kernel entry points to get and set 128 * the time-of-day and per-process interval timers. Subroutines 129 * here provide support for adding and subtracting timeval structures 130 * and decrementing interval timers, optionally reloading the interval 131 * timers when they expire. 132 */ 133 134 /* This function is used by clock_settime and settimeofday */ 135 static int 136 settime1(struct proc *p, const struct timespec *ts, bool check_kauth) 137 { 138 struct timespec delta, now; 139 int s; 140 141 /* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */ 142 s = splclock(); 143 nanotime(&now); 144 timespecsub(ts, &now, &delta); 145 146 if (check_kauth && kauth_authorize_system(kauth_cred_get(), 147 KAUTH_SYSTEM_TIME, KAUTH_REQ_SYSTEM_TIME_SYSTEM, __UNCONST(ts), 148 &delta, KAUTH_ARG(check_kauth ? false : true)) != 0) { 149 splx(s); 150 return (EPERM); 151 } 152 153 #ifdef notyet 154 if ((delta.tv_sec < 86400) && securelevel > 0) { /* XXX elad - notyet */ 155 splx(s); 156 return (EPERM); 157 } 158 #endif 159 160 tc_setclock(ts); 161 162 timespecadd(&boottime, &delta, &boottime); 163 164 resettodr(); 165 splx(s); 166 167 return (0); 168 } 169 170 int 171 settime(struct proc *p, struct timespec *ts) 172 { 173 return (settime1(p, ts, true)); 174 } 175 176 /* ARGSUSED */ 177 int 178 sys___clock_gettime50(struct lwp *l, 179 const struct sys___clock_gettime50_args *uap, register_t *retval) 180 { 181 /* { 182 syscallarg(clockid_t) clock_id; 183 syscallarg(struct timespec *) tp; 184 } */ 185 int error; 186 struct timespec ats; 187 188 error = clock_gettime1(SCARG(uap, clock_id), &ats); 189 if (error != 0) 190 return error; 191 192 return copyout(&ats, SCARG(uap, tp), sizeof(ats)); 193 } 194 195 /* ARGSUSED */ 196 int 197 sys___clock_settime50(struct lwp *l, 198 const struct sys___clock_settime50_args *uap, register_t *retval) 199 { 200 /* { 201 syscallarg(clockid_t) clock_id; 202 syscallarg(const struct timespec *) tp; 203 } */ 204 int error; 205 struct timespec ats; 206 207 if ((error = copyin(SCARG(uap, tp), &ats, sizeof(ats))) != 0) 208 return error; 209 210 return clock_settime1(l->l_proc, SCARG(uap, clock_id), &ats, true); 211 } 212 213 214 int 215 clock_settime1(struct proc *p, clockid_t clock_id, const struct timespec *tp, 216 bool check_kauth) 217 { 218 int error; 219 220 switch (clock_id) { 221 case CLOCK_REALTIME: 222 if ((error = settime1(p, tp, check_kauth)) != 0) 223 return (error); 224 break; 225 case CLOCK_MONOTONIC: 226 return (EINVAL); /* read-only clock */ 227 default: 228 return (EINVAL); 229 } 230 231 return 0; 232 } 233 234 int 235 sys___clock_getres50(struct lwp *l, const struct sys___clock_getres50_args *uap, 236 register_t *retval) 237 { 238 /* { 239 syscallarg(clockid_t) clock_id; 240 syscallarg(struct timespec *) tp; 241 } */ 242 struct timespec ts; 243 int error; 244 245 if ((error = clock_getres1(SCARG(uap, clock_id), &ts)) != 0) 246 return error; 247 248 if (SCARG(uap, tp)) 249 error = copyout(&ts, SCARG(uap, tp), sizeof(ts)); 250 251 return error; 252 } 253 254 int 255 clock_getres1(clockid_t clock_id, struct timespec *ts) 256 { 257 258 switch (clock_id) { 259 case CLOCK_REALTIME: 260 case CLOCK_MONOTONIC: 261 ts->tv_sec = 0; 262 if (tc_getfrequency() > 1000000000) 263 ts->tv_nsec = 1; 264 else 265 ts->tv_nsec = 1000000000 / tc_getfrequency(); 266 break; 267 default: 268 return EINVAL; 269 } 270 271 return 0; 272 } 273 274 /* ARGSUSED */ 275 int 276 sys___nanosleep50(struct lwp *l, const struct sys___nanosleep50_args *uap, 277 register_t *retval) 278 { 279 /* { 280 syscallarg(struct timespec *) rqtp; 281 syscallarg(struct timespec *) rmtp; 282 } */ 283 struct timespec rmt, rqt; 284 int error, error1; 285 286 error = copyin(SCARG(uap, rqtp), &rqt, sizeof(struct timespec)); 287 if (error) 288 return (error); 289 290 error = nanosleep1(l, CLOCK_MONOTONIC, 0, &rqt, 291 SCARG(uap, rmtp) ? &rmt : NULL); 292 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 293 return error; 294 295 error1 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt)); 296 return error1 ? error1 : error; 297 } 298 299 /* ARGSUSED */ 300 int 301 sys_clock_nanosleep(struct lwp *l, const struct sys_clock_nanosleep_args *uap, 302 register_t *retval) 303 { 304 /* { 305 syscallarg(clockid_t) clock_id; 306 syscallarg(int) flags; 307 syscallarg(struct timespec *) rqtp; 308 syscallarg(struct timespec *) rmtp; 309 } */ 310 struct timespec rmt, rqt; 311 int error, error1; 312 313 error = copyin(SCARG(uap, rqtp), &rqt, sizeof(struct timespec)); 314 if (error) 315 goto out; 316 317 error = nanosleep1(l, SCARG(uap, clock_id), SCARG(uap, flags), &rqt, 318 SCARG(uap, rmtp) ? &rmt : NULL); 319 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 320 goto out; 321 322 if ((SCARG(uap, flags) & TIMER_ABSTIME) == 0 && 323 (error1 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt))) != 0) 324 error = error1; 325 out: 326 *retval = error; 327 return 0; 328 } 329 330 int 331 nanosleep1(struct lwp *l, clockid_t clock_id, int flags, struct timespec *rqt, 332 struct timespec *rmt) 333 { 334 struct timespec rmtstart; 335 int error, timo; 336 337 if ((error = ts2timo(clock_id, flags, rqt, &timo, &rmtstart)) != 0) { 338 if (error == ETIMEDOUT) { 339 error = 0; 340 if (rmt != NULL) 341 rmt->tv_sec = rmt->tv_nsec = 0; 342 } 343 return error; 344 } 345 346 /* 347 * Avoid inadvertently sleeping forever 348 */ 349 if (timo == 0) 350 timo = 1; 351 again: 352 error = kpause("nanoslp", true, timo, NULL); 353 if (error == EWOULDBLOCK) 354 error = 0; 355 if (rmt != NULL || error == 0) { 356 struct timespec rmtend; 357 struct timespec t0; 358 struct timespec *t; 359 360 (void)clock_gettime1(clock_id, &rmtend); 361 t = (rmt != NULL) ? rmt : &t0; 362 if (flags & TIMER_ABSTIME) { 363 timespecsub(rqt, &rmtend, t); 364 } else { 365 timespecsub(&rmtend, &rmtstart, t); 366 timespecsub(rqt, t, t); 367 } 368 if (t->tv_sec < 0) 369 timespecclear(t); 370 if (error == 0) { 371 timo = tstohz(t); 372 if (timo > 0) 373 goto again; 374 } 375 } 376 377 if (error == ERESTART) 378 error = EINTR; 379 380 return error; 381 } 382 383 int 384 sys_clock_getcpuclockid2(struct lwp *l, 385 const struct sys_clock_getcpuclockid2_args *uap, 386 register_t *retval) 387 { 388 /* { 389 syscallarg(idtype_t idtype; 390 syscallarg(id_t id); 391 syscallarg(clockid_t *)clock_id; 392 } */ 393 pid_t pid; 394 lwpid_t lid; 395 clockid_t clock_id; 396 id_t id = SCARG(uap, id); 397 398 switch (SCARG(uap, idtype)) { 399 case P_PID: 400 pid = id == 0 ? l->l_proc->p_pid : id; 401 clock_id = CLOCK_PROCESS_CPUTIME_ID | pid; 402 break; 403 case P_LWPID: 404 lid = id == 0 ? l->l_lid : id; 405 clock_id = CLOCK_THREAD_CPUTIME_ID | lid; 406 break; 407 default: 408 return EINVAL; 409 } 410 return copyout(&clock_id, SCARG(uap, clock_id), sizeof(clock_id)); 411 } 412 413 /* ARGSUSED */ 414 int 415 sys___gettimeofday50(struct lwp *l, const struct sys___gettimeofday50_args *uap, 416 register_t *retval) 417 { 418 /* { 419 syscallarg(struct timeval *) tp; 420 syscallarg(void *) tzp; really "struct timezone *"; 421 } */ 422 struct timeval atv; 423 int error = 0; 424 struct timezone tzfake; 425 426 if (SCARG(uap, tp)) { 427 memset(&atv, 0, sizeof(atv)); 428 microtime(&atv); 429 error = copyout(&atv, SCARG(uap, tp), sizeof(atv)); 430 if (error) 431 return (error); 432 } 433 if (SCARG(uap, tzp)) { 434 /* 435 * NetBSD has no kernel notion of time zone, so we just 436 * fake up a timezone struct and return it if demanded. 437 */ 438 tzfake.tz_minuteswest = 0; 439 tzfake.tz_dsttime = 0; 440 error = copyout(&tzfake, SCARG(uap, tzp), sizeof(tzfake)); 441 } 442 return (error); 443 } 444 445 /* ARGSUSED */ 446 int 447 sys___settimeofday50(struct lwp *l, const struct sys___settimeofday50_args *uap, 448 register_t *retval) 449 { 450 /* { 451 syscallarg(const struct timeval *) tv; 452 syscallarg(const void *) tzp; really "const struct timezone *"; 453 } */ 454 455 return settimeofday1(SCARG(uap, tv), true, SCARG(uap, tzp), l, true); 456 } 457 458 int 459 settimeofday1(const struct timeval *utv, bool userspace, 460 const void *utzp, struct lwp *l, bool check_kauth) 461 { 462 struct timeval atv; 463 struct timespec ts; 464 int error; 465 466 /* Verify all parameters before changing time. */ 467 468 /* 469 * NetBSD has no kernel notion of time zone, and only an 470 * obsolete program would try to set it, so we log a warning. 471 */ 472 if (utzp) 473 log(LOG_WARNING, "pid %d attempted to set the " 474 "(obsolete) kernel time zone\n", l->l_proc->p_pid); 475 476 if (utv == NULL) 477 return 0; 478 479 if (userspace) { 480 if ((error = copyin(utv, &atv, sizeof(atv))) != 0) 481 return error; 482 utv = &atv; 483 } 484 485 TIMEVAL_TO_TIMESPEC(utv, &ts); 486 return settime1(l->l_proc, &ts, check_kauth); 487 } 488 489 int time_adjusted; /* set if an adjustment is made */ 490 491 /* ARGSUSED */ 492 int 493 sys___adjtime50(struct lwp *l, const struct sys___adjtime50_args *uap, 494 register_t *retval) 495 { 496 /* { 497 syscallarg(const struct timeval *) delta; 498 syscallarg(struct timeval *) olddelta; 499 } */ 500 int error; 501 struct timeval atv, oldatv; 502 503 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_TIME, 504 KAUTH_REQ_SYSTEM_TIME_ADJTIME, NULL, NULL, NULL)) != 0) 505 return error; 506 507 if (SCARG(uap, delta)) { 508 error = copyin(SCARG(uap, delta), &atv, 509 sizeof(*SCARG(uap, delta))); 510 if (error) 511 return (error); 512 } 513 adjtime1(SCARG(uap, delta) ? &atv : NULL, 514 SCARG(uap, olddelta) ? &oldatv : NULL, l->l_proc); 515 if (SCARG(uap, olddelta)) 516 error = copyout(&oldatv, SCARG(uap, olddelta), 517 sizeof(*SCARG(uap, olddelta))); 518 return error; 519 } 520 521 void 522 adjtime1(const struct timeval *delta, struct timeval *olddelta, struct proc *p) 523 { 524 extern int64_t time_adjtime; /* in kern_ntptime.c */ 525 526 if (olddelta) { 527 memset(olddelta, 0, sizeof(*olddelta)); 528 mutex_spin_enter(&timecounter_lock); 529 olddelta->tv_sec = time_adjtime / 1000000; 530 olddelta->tv_usec = time_adjtime % 1000000; 531 if (olddelta->tv_usec < 0) { 532 olddelta->tv_usec += 1000000; 533 olddelta->tv_sec--; 534 } 535 mutex_spin_exit(&timecounter_lock); 536 } 537 538 if (delta) { 539 mutex_spin_enter(&timecounter_lock); 540 time_adjtime = delta->tv_sec * 1000000 + delta->tv_usec; 541 542 if (time_adjtime) { 543 /* We need to save the system time during shutdown */ 544 time_adjusted |= 1; 545 } 546 mutex_spin_exit(&timecounter_lock); 547 } 548 } 549 550 /* 551 * Interval timer support. Both the BSD getitimer() family and the POSIX 552 * timer_*() family of routines are supported. 553 * 554 * All timers are kept in an array pointed to by p_timers, which is 555 * allocated on demand - many processes don't use timers at all. The 556 * first four elements in this array are reserved for the BSD timers: 557 * element 0 is ITIMER_REAL, element 1 is ITIMER_VIRTUAL, element 558 * 2 is ITIMER_PROF, and element 3 is ITIMER_MONOTONIC. The rest may be 559 * allocated by the timer_create() syscall. 560 * 561 * Realtime timers are kept in the ptimer structure as an absolute 562 * time; virtual time timers are kept as a linked list of deltas. 563 * Virtual time timers are processed in the hardclock() routine of 564 * kern_clock.c. The real time timer is processed by a callout 565 * routine, called from the softclock() routine. Since a callout may 566 * be delayed in real time due to interrupt processing in the system, 567 * it is possible for the real time timeout routine (realtimeexpire, 568 * given below), to be delayed in real time past when it is supposed 569 * to occur. It does not suffice, therefore, to reload the real timer 570 * .it_value from the real time timers .it_interval. Rather, we 571 * compute the next time in absolute time the timer should go off. */ 572 573 /* Allocate a POSIX realtime timer. */ 574 int 575 sys_timer_create(struct lwp *l, const struct sys_timer_create_args *uap, 576 register_t *retval) 577 { 578 /* { 579 syscallarg(clockid_t) clock_id; 580 syscallarg(struct sigevent *) evp; 581 syscallarg(timer_t *) timerid; 582 } */ 583 584 return timer_create1(SCARG(uap, timerid), SCARG(uap, clock_id), 585 SCARG(uap, evp), copyin, l); 586 } 587 588 int 589 timer_create1(timer_t *tid, clockid_t id, struct sigevent *evp, 590 copyin_t fetch_event, struct lwp *l) 591 { 592 int error; 593 timer_t timerid; 594 struct ptimers *pts; 595 struct ptimer *pt; 596 struct proc *p; 597 598 p = l->l_proc; 599 600 if ((u_int)id > CLOCK_MONOTONIC) 601 return (EINVAL); 602 603 if ((pts = p->p_timers) == NULL) 604 pts = timers_alloc(p); 605 606 pt = pool_get(&ptimer_pool, PR_WAITOK | PR_ZERO); 607 if (evp != NULL) { 608 if (((error = 609 (*fetch_event)(evp, &pt->pt_ev, sizeof(pt->pt_ev))) != 0) || 610 ((pt->pt_ev.sigev_notify < SIGEV_NONE) || 611 (pt->pt_ev.sigev_notify > SIGEV_SA)) || 612 (pt->pt_ev.sigev_notify == SIGEV_SIGNAL && 613 (pt->pt_ev.sigev_signo <= 0 || 614 pt->pt_ev.sigev_signo >= NSIG))) { 615 pool_put(&ptimer_pool, pt); 616 return (error ? error : EINVAL); 617 } 618 } 619 620 /* Find a free timer slot, skipping those reserved for setitimer(). */ 621 mutex_spin_enter(&timer_lock); 622 for (timerid = TIMER_MIN; timerid < TIMER_MAX; timerid++) 623 if (pts->pts_timers[timerid] == NULL) 624 break; 625 if (timerid == TIMER_MAX) { 626 mutex_spin_exit(&timer_lock); 627 pool_put(&ptimer_pool, pt); 628 return EAGAIN; 629 } 630 if (evp == NULL) { 631 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 632 switch (id) { 633 case CLOCK_REALTIME: 634 case CLOCK_MONOTONIC: 635 pt->pt_ev.sigev_signo = SIGALRM; 636 break; 637 case CLOCK_VIRTUAL: 638 pt->pt_ev.sigev_signo = SIGVTALRM; 639 break; 640 case CLOCK_PROF: 641 pt->pt_ev.sigev_signo = SIGPROF; 642 break; 643 } 644 pt->pt_ev.sigev_value.sival_int = timerid; 645 } 646 pt->pt_info.ksi_signo = pt->pt_ev.sigev_signo; 647 pt->pt_info.ksi_errno = 0; 648 pt->pt_info.ksi_code = 0; 649 pt->pt_info.ksi_pid = p->p_pid; 650 pt->pt_info.ksi_uid = kauth_cred_getuid(l->l_cred); 651 pt->pt_info.ksi_value = pt->pt_ev.sigev_value; 652 pt->pt_type = id; 653 pt->pt_proc = p; 654 pt->pt_overruns = 0; 655 pt->pt_poverruns = 0; 656 pt->pt_entry = timerid; 657 pt->pt_queued = false; 658 timespecclear(&pt->pt_time.it_value); 659 if (!CLOCK_VIRTUAL_P(id)) 660 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 661 else 662 pt->pt_active = 0; 663 664 pts->pts_timers[timerid] = pt; 665 mutex_spin_exit(&timer_lock); 666 667 return copyout(&timerid, tid, sizeof(timerid)); 668 } 669 670 /* Delete a POSIX realtime timer */ 671 int 672 sys_timer_delete(struct lwp *l, const struct sys_timer_delete_args *uap, 673 register_t *retval) 674 { 675 /* { 676 syscallarg(timer_t) timerid; 677 } */ 678 struct proc *p = l->l_proc; 679 timer_t timerid; 680 struct ptimers *pts; 681 struct ptimer *pt, *ptn; 682 683 timerid = SCARG(uap, timerid); 684 pts = p->p_timers; 685 686 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 687 return (EINVAL); 688 689 mutex_spin_enter(&timer_lock); 690 if ((pt = pts->pts_timers[timerid]) == NULL) { 691 mutex_spin_exit(&timer_lock); 692 return (EINVAL); 693 } 694 if (CLOCK_VIRTUAL_P(pt->pt_type)) { 695 if (pt->pt_active) { 696 ptn = LIST_NEXT(pt, pt_list); 697 LIST_REMOVE(pt, pt_list); 698 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 699 timespecadd(&pt->pt_time.it_value, 700 &ptn->pt_time.it_value, 701 &ptn->pt_time.it_value); 702 pt->pt_active = 0; 703 } 704 } 705 itimerfree(pts, timerid); 706 707 return (0); 708 } 709 710 /* 711 * Set up the given timer. The value in pt->pt_time.it_value is taken 712 * to be an absolute time for CLOCK_REALTIME/CLOCK_MONOTONIC timers and 713 * a relative time for CLOCK_VIRTUAL/CLOCK_PROF timers. 714 */ 715 void 716 timer_settime(struct ptimer *pt) 717 { 718 struct ptimer *ptn, *pptn; 719 struct ptlist *ptl; 720 721 KASSERT(mutex_owned(&timer_lock)); 722 723 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 724 callout_halt(&pt->pt_ch, &timer_lock); 725 if (timespecisset(&pt->pt_time.it_value)) { 726 /* 727 * Don't need to check tshzto() return value, here. 728 * callout_reset() does it for us. 729 */ 730 callout_reset(&pt->pt_ch, 731 pt->pt_type == CLOCK_MONOTONIC ? 732 tshztoup(&pt->pt_time.it_value) : 733 tshzto(&pt->pt_time.it_value), 734 realtimerexpire, pt); 735 } 736 } else { 737 if (pt->pt_active) { 738 ptn = LIST_NEXT(pt, pt_list); 739 LIST_REMOVE(pt, pt_list); 740 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 741 timespecadd(&pt->pt_time.it_value, 742 &ptn->pt_time.it_value, 743 &ptn->pt_time.it_value); 744 } 745 if (timespecisset(&pt->pt_time.it_value)) { 746 if (pt->pt_type == CLOCK_VIRTUAL) 747 ptl = &pt->pt_proc->p_timers->pts_virtual; 748 else 749 ptl = &pt->pt_proc->p_timers->pts_prof; 750 751 for (ptn = LIST_FIRST(ptl), pptn = NULL; 752 ptn && timespeccmp(&pt->pt_time.it_value, 753 &ptn->pt_time.it_value, >); 754 pptn = ptn, ptn = LIST_NEXT(ptn, pt_list)) 755 timespecsub(&pt->pt_time.it_value, 756 &ptn->pt_time.it_value, 757 &pt->pt_time.it_value); 758 759 if (pptn) 760 LIST_INSERT_AFTER(pptn, pt, pt_list); 761 else 762 LIST_INSERT_HEAD(ptl, pt, pt_list); 763 764 for ( ; ptn ; ptn = LIST_NEXT(ptn, pt_list)) 765 timespecsub(&ptn->pt_time.it_value, 766 &pt->pt_time.it_value, 767 &ptn->pt_time.it_value); 768 769 pt->pt_active = 1; 770 } else 771 pt->pt_active = 0; 772 } 773 } 774 775 void 776 timer_gettime(struct ptimer *pt, struct itimerspec *aits) 777 { 778 struct timespec now; 779 struct ptimer *ptn; 780 781 KASSERT(mutex_owned(&timer_lock)); 782 783 *aits = pt->pt_time; 784 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 785 /* 786 * Convert from absolute to relative time in .it_value 787 * part of real time timer. If time for real time 788 * timer has passed return 0, else return difference 789 * between current time and time for the timer to go 790 * off. 791 */ 792 if (timespecisset(&aits->it_value)) { 793 if (pt->pt_type == CLOCK_REALTIME) { 794 getnanotime(&now); 795 } else { /* CLOCK_MONOTONIC */ 796 getnanouptime(&now); 797 } 798 if (timespeccmp(&aits->it_value, &now, <)) 799 timespecclear(&aits->it_value); 800 else 801 timespecsub(&aits->it_value, &now, 802 &aits->it_value); 803 } 804 } else if (pt->pt_active) { 805 if (pt->pt_type == CLOCK_VIRTUAL) 806 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_virtual); 807 else 808 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_prof); 809 for ( ; ptn && ptn != pt; ptn = LIST_NEXT(ptn, pt_list)) 810 timespecadd(&aits->it_value, 811 &ptn->pt_time.it_value, &aits->it_value); 812 KASSERT(ptn != NULL); /* pt should be findable on the list */ 813 } else 814 timespecclear(&aits->it_value); 815 } 816 817 818 819 /* Set and arm a POSIX realtime timer */ 820 int 821 sys___timer_settime50(struct lwp *l, 822 const struct sys___timer_settime50_args *uap, 823 register_t *retval) 824 { 825 /* { 826 syscallarg(timer_t) timerid; 827 syscallarg(int) flags; 828 syscallarg(const struct itimerspec *) value; 829 syscallarg(struct itimerspec *) ovalue; 830 } */ 831 int error; 832 struct itimerspec value, ovalue, *ovp = NULL; 833 834 if ((error = copyin(SCARG(uap, value), &value, 835 sizeof(struct itimerspec))) != 0) 836 return (error); 837 838 if (SCARG(uap, ovalue)) 839 ovp = &ovalue; 840 841 if ((error = dotimer_settime(SCARG(uap, timerid), &value, ovp, 842 SCARG(uap, flags), l->l_proc)) != 0) 843 return error; 844 845 if (ovp) 846 return copyout(&ovalue, SCARG(uap, ovalue), 847 sizeof(struct itimerspec)); 848 return 0; 849 } 850 851 int 852 dotimer_settime(int timerid, struct itimerspec *value, 853 struct itimerspec *ovalue, int flags, struct proc *p) 854 { 855 struct timespec now; 856 struct itimerspec val, oval; 857 struct ptimers *pts; 858 struct ptimer *pt; 859 int error; 860 861 pts = p->p_timers; 862 863 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 864 return EINVAL; 865 val = *value; 866 if ((error = itimespecfix(&val.it_value)) != 0 || 867 (error = itimespecfix(&val.it_interval)) != 0) 868 return error; 869 870 mutex_spin_enter(&timer_lock); 871 if ((pt = pts->pts_timers[timerid]) == NULL) { 872 mutex_spin_exit(&timer_lock); 873 return EINVAL; 874 } 875 876 oval = pt->pt_time; 877 pt->pt_time = val; 878 879 /* 880 * If we've been passed a relative time for a realtime timer, 881 * convert it to absolute; if an absolute time for a virtual 882 * timer, convert it to relative and make sure we don't set it 883 * to zero, which would cancel the timer, or let it go 884 * negative, which would confuse the comparison tests. 885 */ 886 if (timespecisset(&pt->pt_time.it_value)) { 887 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 888 if ((flags & TIMER_ABSTIME) == 0) { 889 if (pt->pt_type == CLOCK_REALTIME) { 890 getnanotime(&now); 891 } else { /* CLOCK_MONOTONIC */ 892 getnanouptime(&now); 893 } 894 timespecadd(&pt->pt_time.it_value, &now, 895 &pt->pt_time.it_value); 896 } 897 } else { 898 if ((flags & TIMER_ABSTIME) != 0) { 899 getnanotime(&now); 900 timespecsub(&pt->pt_time.it_value, &now, 901 &pt->pt_time.it_value); 902 if (!timespecisset(&pt->pt_time.it_value) || 903 pt->pt_time.it_value.tv_sec < 0) { 904 pt->pt_time.it_value.tv_sec = 0; 905 pt->pt_time.it_value.tv_nsec = 1; 906 } 907 } 908 } 909 } 910 911 timer_settime(pt); 912 mutex_spin_exit(&timer_lock); 913 914 if (ovalue) 915 *ovalue = oval; 916 917 return (0); 918 } 919 920 /* Return the time remaining until a POSIX timer fires. */ 921 int 922 sys___timer_gettime50(struct lwp *l, 923 const struct sys___timer_gettime50_args *uap, register_t *retval) 924 { 925 /* { 926 syscallarg(timer_t) timerid; 927 syscallarg(struct itimerspec *) value; 928 } */ 929 struct itimerspec its; 930 int error; 931 932 if ((error = dotimer_gettime(SCARG(uap, timerid), l->l_proc, 933 &its)) != 0) 934 return error; 935 936 return copyout(&its, SCARG(uap, value), sizeof(its)); 937 } 938 939 int 940 dotimer_gettime(int timerid, struct proc *p, struct itimerspec *its) 941 { 942 struct ptimer *pt; 943 struct ptimers *pts; 944 945 pts = p->p_timers; 946 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 947 return (EINVAL); 948 mutex_spin_enter(&timer_lock); 949 if ((pt = pts->pts_timers[timerid]) == NULL) { 950 mutex_spin_exit(&timer_lock); 951 return (EINVAL); 952 } 953 timer_gettime(pt, its); 954 mutex_spin_exit(&timer_lock); 955 956 return 0; 957 } 958 959 /* 960 * Return the count of the number of times a periodic timer expired 961 * while a notification was already pending. The counter is reset when 962 * a timer expires and a notification can be posted. 963 */ 964 int 965 sys_timer_getoverrun(struct lwp *l, const struct sys_timer_getoverrun_args *uap, 966 register_t *retval) 967 { 968 /* { 969 syscallarg(timer_t) timerid; 970 } */ 971 struct proc *p = l->l_proc; 972 struct ptimers *pts; 973 int timerid; 974 struct ptimer *pt; 975 976 timerid = SCARG(uap, timerid); 977 978 pts = p->p_timers; 979 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 980 return (EINVAL); 981 mutex_spin_enter(&timer_lock); 982 if ((pt = pts->pts_timers[timerid]) == NULL) { 983 mutex_spin_exit(&timer_lock); 984 return (EINVAL); 985 } 986 *retval = pt->pt_poverruns; 987 if (*retval >= DELAYTIMER_MAX) 988 *retval = DELAYTIMER_MAX; 989 mutex_spin_exit(&timer_lock); 990 991 return (0); 992 } 993 994 /* 995 * Real interval timer expired: 996 * send process whose timer expired an alarm signal. 997 * If time is not set up to reload, then just return. 998 * Else compute next time timer should go off which is > current time. 999 * This is where delay in processing this timeout causes multiple 1000 * SIGALRM calls to be compressed into one. 1001 */ 1002 void 1003 realtimerexpire(void *arg) 1004 { 1005 uint64_t last_val, next_val, interval, now_ns; 1006 struct timespec now, next; 1007 struct ptimer *pt; 1008 int backwards; 1009 1010 pt = arg; 1011 1012 mutex_spin_enter(&timer_lock); 1013 itimerfire(pt); 1014 1015 if (!timespecisset(&pt->pt_time.it_interval)) { 1016 timespecclear(&pt->pt_time.it_value); 1017 mutex_spin_exit(&timer_lock); 1018 return; 1019 } 1020 1021 if (pt->pt_type == CLOCK_MONOTONIC) { 1022 getnanouptime(&now); 1023 } else { 1024 getnanotime(&now); 1025 } 1026 backwards = (timespeccmp(&pt->pt_time.it_value, &now, >)); 1027 timespecadd(&pt->pt_time.it_value, &pt->pt_time.it_interval, &next); 1028 /* Handle the easy case of non-overflown timers first. */ 1029 if (!backwards && timespeccmp(&next, &now, >)) { 1030 pt->pt_time.it_value = next; 1031 } else { 1032 now_ns = timespec2ns(&now); 1033 last_val = timespec2ns(&pt->pt_time.it_value); 1034 interval = timespec2ns(&pt->pt_time.it_interval); 1035 1036 next_val = now_ns + 1037 (now_ns - last_val + interval - 1) % interval; 1038 1039 if (backwards) 1040 next_val += interval; 1041 else 1042 pt->pt_overruns += (now_ns - last_val) / interval; 1043 1044 pt->pt_time.it_value.tv_sec = next_val / 1000000000; 1045 pt->pt_time.it_value.tv_nsec = next_val % 1000000000; 1046 } 1047 1048 /* 1049 * Don't need to check tshzto() return value, here. 1050 * callout_reset() does it for us. 1051 */ 1052 callout_reset(&pt->pt_ch, pt->pt_type == CLOCK_MONOTONIC ? 1053 tshztoup(&pt->pt_time.it_value) : tshzto(&pt->pt_time.it_value), 1054 realtimerexpire, pt); 1055 mutex_spin_exit(&timer_lock); 1056 } 1057 1058 /* BSD routine to get the value of an interval timer. */ 1059 /* ARGSUSED */ 1060 int 1061 sys___getitimer50(struct lwp *l, const struct sys___getitimer50_args *uap, 1062 register_t *retval) 1063 { 1064 /* { 1065 syscallarg(int) which; 1066 syscallarg(struct itimerval *) itv; 1067 } */ 1068 struct proc *p = l->l_proc; 1069 struct itimerval aitv; 1070 int error; 1071 1072 memset(&aitv, 0, sizeof(aitv)); 1073 error = dogetitimer(p, SCARG(uap, which), &aitv); 1074 if (error) 1075 return error; 1076 return (copyout(&aitv, SCARG(uap, itv), sizeof(struct itimerval))); 1077 } 1078 1079 int 1080 dogetitimer(struct proc *p, int which, struct itimerval *itvp) 1081 { 1082 struct ptimers *pts; 1083 struct ptimer *pt; 1084 struct itimerspec its; 1085 1086 if ((u_int)which > ITIMER_MONOTONIC) 1087 return (EINVAL); 1088 1089 mutex_spin_enter(&timer_lock); 1090 pts = p->p_timers; 1091 if (pts == NULL || (pt = pts->pts_timers[which]) == NULL) { 1092 timerclear(&itvp->it_value); 1093 timerclear(&itvp->it_interval); 1094 } else { 1095 timer_gettime(pt, &its); 1096 TIMESPEC_TO_TIMEVAL(&itvp->it_value, &its.it_value); 1097 TIMESPEC_TO_TIMEVAL(&itvp->it_interval, &its.it_interval); 1098 } 1099 mutex_spin_exit(&timer_lock); 1100 1101 return 0; 1102 } 1103 1104 /* BSD routine to set/arm an interval timer. */ 1105 /* ARGSUSED */ 1106 int 1107 sys___setitimer50(struct lwp *l, const struct sys___setitimer50_args *uap, 1108 register_t *retval) 1109 { 1110 /* { 1111 syscallarg(int) which; 1112 syscallarg(const struct itimerval *) itv; 1113 syscallarg(struct itimerval *) oitv; 1114 } */ 1115 struct proc *p = l->l_proc; 1116 int which = SCARG(uap, which); 1117 struct sys___getitimer50_args getargs; 1118 const struct itimerval *itvp; 1119 struct itimerval aitv; 1120 int error; 1121 1122 if ((u_int)which > ITIMER_MONOTONIC) 1123 return (EINVAL); 1124 itvp = SCARG(uap, itv); 1125 if (itvp && 1126 (error = copyin(itvp, &aitv, sizeof(struct itimerval))) != 0) 1127 return (error); 1128 if (SCARG(uap, oitv) != NULL) { 1129 SCARG(&getargs, which) = which; 1130 SCARG(&getargs, itv) = SCARG(uap, oitv); 1131 if ((error = sys___getitimer50(l, &getargs, retval)) != 0) 1132 return (error); 1133 } 1134 if (itvp == 0) 1135 return (0); 1136 1137 return dosetitimer(p, which, &aitv); 1138 } 1139 1140 int 1141 dosetitimer(struct proc *p, int which, struct itimerval *itvp) 1142 { 1143 struct timespec now; 1144 struct ptimers *pts; 1145 struct ptimer *pt, *spare; 1146 1147 KASSERT((u_int)which <= CLOCK_MONOTONIC); 1148 if (itimerfix(&itvp->it_value) || itimerfix(&itvp->it_interval)) 1149 return (EINVAL); 1150 1151 /* 1152 * Don't bother allocating data structures if the process just 1153 * wants to clear the timer. 1154 */ 1155 spare = NULL; 1156 pts = p->p_timers; 1157 retry: 1158 if (!timerisset(&itvp->it_value) && (pts == NULL || 1159 pts->pts_timers[which] == NULL)) 1160 return (0); 1161 if (pts == NULL) 1162 pts = timers_alloc(p); 1163 mutex_spin_enter(&timer_lock); 1164 pt = pts->pts_timers[which]; 1165 if (pt == NULL) { 1166 if (spare == NULL) { 1167 mutex_spin_exit(&timer_lock); 1168 spare = pool_get(&ptimer_pool, PR_WAITOK | PR_ZERO); 1169 goto retry; 1170 } 1171 pt = spare; 1172 spare = NULL; 1173 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 1174 pt->pt_ev.sigev_value.sival_int = which; 1175 pt->pt_overruns = 0; 1176 pt->pt_proc = p; 1177 pt->pt_type = which; 1178 pt->pt_entry = which; 1179 pt->pt_queued = false; 1180 if (!CLOCK_VIRTUAL_P(which)) 1181 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 1182 else 1183 pt->pt_active = 0; 1184 1185 switch (which) { 1186 case ITIMER_REAL: 1187 case ITIMER_MONOTONIC: 1188 pt->pt_ev.sigev_signo = SIGALRM; 1189 break; 1190 case ITIMER_VIRTUAL: 1191 pt->pt_ev.sigev_signo = SIGVTALRM; 1192 break; 1193 case ITIMER_PROF: 1194 pt->pt_ev.sigev_signo = SIGPROF; 1195 break; 1196 } 1197 pts->pts_timers[which] = pt; 1198 } 1199 1200 TIMEVAL_TO_TIMESPEC(&itvp->it_value, &pt->pt_time.it_value); 1201 TIMEVAL_TO_TIMESPEC(&itvp->it_interval, &pt->pt_time.it_interval); 1202 1203 if (timespecisset(&pt->pt_time.it_value)) { 1204 /* Convert to absolute time */ 1205 /* XXX need to wrap in splclock for timecounters case? */ 1206 switch (which) { 1207 case ITIMER_REAL: 1208 getnanotime(&now); 1209 timespecadd(&pt->pt_time.it_value, &now, 1210 &pt->pt_time.it_value); 1211 break; 1212 case ITIMER_MONOTONIC: 1213 getnanouptime(&now); 1214 timespecadd(&pt->pt_time.it_value, &now, 1215 &pt->pt_time.it_value); 1216 break; 1217 default: 1218 break; 1219 } 1220 } 1221 timer_settime(pt); 1222 mutex_spin_exit(&timer_lock); 1223 if (spare != NULL) 1224 pool_put(&ptimer_pool, spare); 1225 1226 return (0); 1227 } 1228 1229 /* Utility routines to manage the array of pointers to timers. */ 1230 struct ptimers * 1231 timers_alloc(struct proc *p) 1232 { 1233 struct ptimers *pts; 1234 int i; 1235 1236 pts = pool_get(&ptimers_pool, PR_WAITOK); 1237 LIST_INIT(&pts->pts_virtual); 1238 LIST_INIT(&pts->pts_prof); 1239 for (i = 0; i < TIMER_MAX; i++) 1240 pts->pts_timers[i] = NULL; 1241 mutex_spin_enter(&timer_lock); 1242 if (p->p_timers == NULL) { 1243 p->p_timers = pts; 1244 mutex_spin_exit(&timer_lock); 1245 return pts; 1246 } 1247 mutex_spin_exit(&timer_lock); 1248 pool_put(&ptimers_pool, pts); 1249 return p->p_timers; 1250 } 1251 1252 /* 1253 * Clean up the per-process timers. If "which" is set to TIMERS_ALL, 1254 * then clean up all timers and free all the data structures. If 1255 * "which" is set to TIMERS_POSIX, only clean up the timers allocated 1256 * by timer_create(), not the BSD setitimer() timers, and only free the 1257 * structure if none of those remain. 1258 */ 1259 void 1260 timers_free(struct proc *p, int which) 1261 { 1262 struct ptimers *pts; 1263 struct ptimer *ptn; 1264 struct timespec ts; 1265 int i; 1266 1267 if (p->p_timers == NULL) 1268 return; 1269 1270 pts = p->p_timers; 1271 mutex_spin_enter(&timer_lock); 1272 if (which == TIMERS_ALL) { 1273 p->p_timers = NULL; 1274 i = 0; 1275 } else { 1276 timespecclear(&ts); 1277 for (ptn = LIST_FIRST(&pts->pts_virtual); 1278 ptn && ptn != pts->pts_timers[ITIMER_VIRTUAL]; 1279 ptn = LIST_NEXT(ptn, pt_list)) { 1280 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1281 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1282 } 1283 LIST_FIRST(&pts->pts_virtual) = NULL; 1284 if (ptn) { 1285 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1286 timespecadd(&ts, &ptn->pt_time.it_value, 1287 &ptn->pt_time.it_value); 1288 LIST_INSERT_HEAD(&pts->pts_virtual, ptn, pt_list); 1289 } 1290 timespecclear(&ts); 1291 for (ptn = LIST_FIRST(&pts->pts_prof); 1292 ptn && ptn != pts->pts_timers[ITIMER_PROF]; 1293 ptn = LIST_NEXT(ptn, pt_list)) { 1294 KASSERT(ptn->pt_type == CLOCK_PROF); 1295 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1296 } 1297 LIST_FIRST(&pts->pts_prof) = NULL; 1298 if (ptn) { 1299 KASSERT(ptn->pt_type == CLOCK_PROF); 1300 timespecadd(&ts, &ptn->pt_time.it_value, 1301 &ptn->pt_time.it_value); 1302 LIST_INSERT_HEAD(&pts->pts_prof, ptn, pt_list); 1303 } 1304 i = TIMER_MIN; 1305 } 1306 for ( ; i < TIMER_MAX; i++) { 1307 if (pts->pts_timers[i] != NULL) { 1308 itimerfree(pts, i); 1309 mutex_spin_enter(&timer_lock); 1310 } 1311 } 1312 if (pts->pts_timers[0] == NULL && pts->pts_timers[1] == NULL && 1313 pts->pts_timers[2] == NULL && pts->pts_timers[3] == NULL) { 1314 p->p_timers = NULL; 1315 mutex_spin_exit(&timer_lock); 1316 pool_put(&ptimers_pool, pts); 1317 } else 1318 mutex_spin_exit(&timer_lock); 1319 } 1320 1321 static void 1322 itimerfree(struct ptimers *pts, int index) 1323 { 1324 struct ptimer *pt; 1325 1326 KASSERT(mutex_owned(&timer_lock)); 1327 1328 pt = pts->pts_timers[index]; 1329 pts->pts_timers[index] = NULL; 1330 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1331 callout_halt(&pt->pt_ch, &timer_lock); 1332 if (pt->pt_queued) 1333 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1334 mutex_spin_exit(&timer_lock); 1335 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1336 callout_destroy(&pt->pt_ch); 1337 pool_put(&ptimer_pool, pt); 1338 } 1339 1340 /* 1341 * Decrement an interval timer by a specified number 1342 * of nanoseconds, which must be less than a second, 1343 * i.e. < 1000000000. If the timer expires, then reload 1344 * it. In this case, carry over (nsec - old value) to 1345 * reduce the value reloaded into the timer so that 1346 * the timer does not drift. This routine assumes 1347 * that it is called in a context where the timers 1348 * on which it is operating cannot change in value. 1349 */ 1350 static int 1351 itimerdecr(struct ptimer *pt, int nsec) 1352 { 1353 struct itimerspec *itp; 1354 1355 KASSERT(mutex_owned(&timer_lock)); 1356 KASSERT(CLOCK_VIRTUAL_P(pt->pt_type)); 1357 1358 itp = &pt->pt_time; 1359 if (itp->it_value.tv_nsec < nsec) { 1360 if (itp->it_value.tv_sec == 0) { 1361 /* expired, and already in next interval */ 1362 nsec -= itp->it_value.tv_nsec; 1363 goto expire; 1364 } 1365 itp->it_value.tv_nsec += 1000000000; 1366 itp->it_value.tv_sec--; 1367 } 1368 itp->it_value.tv_nsec -= nsec; 1369 nsec = 0; 1370 if (timespecisset(&itp->it_value)) 1371 return (1); 1372 /* expired, exactly at end of interval */ 1373 expire: 1374 if (timespecisset(&itp->it_interval)) { 1375 itp->it_value = itp->it_interval; 1376 itp->it_value.tv_nsec -= nsec; 1377 if (itp->it_value.tv_nsec < 0) { 1378 itp->it_value.tv_nsec += 1000000000; 1379 itp->it_value.tv_sec--; 1380 } 1381 timer_settime(pt); 1382 } else 1383 itp->it_value.tv_nsec = 0; /* sec is already 0 */ 1384 return (0); 1385 } 1386 1387 static void 1388 itimerfire(struct ptimer *pt) 1389 { 1390 1391 KASSERT(mutex_owned(&timer_lock)); 1392 1393 /* 1394 * XXX Can overrun, but we don't do signal queueing yet, anyway. 1395 * XXX Relying on the clock interrupt is stupid. 1396 */ 1397 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL || pt->pt_queued) { 1398 return; 1399 } 1400 TAILQ_INSERT_TAIL(&timer_queue, pt, pt_chain); 1401 pt->pt_queued = true; 1402 softint_schedule(timer_sih); 1403 } 1404 1405 void 1406 timer_tick(lwp_t *l, bool user) 1407 { 1408 struct ptimers *pts; 1409 struct ptimer *pt; 1410 proc_t *p; 1411 1412 p = l->l_proc; 1413 if (p->p_timers == NULL) 1414 return; 1415 1416 mutex_spin_enter(&timer_lock); 1417 if ((pts = l->l_proc->p_timers) != NULL) { 1418 /* 1419 * Run current process's virtual and profile time, as needed. 1420 */ 1421 if (user && (pt = LIST_FIRST(&pts->pts_virtual)) != NULL) 1422 if (itimerdecr(pt, tick * 1000) == 0) 1423 itimerfire(pt); 1424 if ((pt = LIST_FIRST(&pts->pts_prof)) != NULL) 1425 if (itimerdecr(pt, tick * 1000) == 0) 1426 itimerfire(pt); 1427 } 1428 mutex_spin_exit(&timer_lock); 1429 } 1430 1431 static void 1432 timer_intr(void *cookie) 1433 { 1434 ksiginfo_t ksi; 1435 struct ptimer *pt; 1436 proc_t *p; 1437 1438 mutex_enter(proc_lock); 1439 mutex_spin_enter(&timer_lock); 1440 while ((pt = TAILQ_FIRST(&timer_queue)) != NULL) { 1441 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1442 KASSERT(pt->pt_queued); 1443 pt->pt_queued = false; 1444 1445 if (pt->pt_proc->p_timers == NULL) { 1446 /* Process is dying. */ 1447 continue; 1448 } 1449 p = pt->pt_proc; 1450 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL) { 1451 continue; 1452 } 1453 if (sigismember(&p->p_sigpend.sp_set, pt->pt_ev.sigev_signo)) { 1454 pt->pt_overruns++; 1455 continue; 1456 } 1457 1458 KSI_INIT(&ksi); 1459 ksi.ksi_signo = pt->pt_ev.sigev_signo; 1460 ksi.ksi_code = SI_TIMER; 1461 ksi.ksi_value = pt->pt_ev.sigev_value; 1462 pt->pt_poverruns = pt->pt_overruns; 1463 pt->pt_overruns = 0; 1464 mutex_spin_exit(&timer_lock); 1465 kpsignal(p, &ksi, NULL); 1466 mutex_spin_enter(&timer_lock); 1467 } 1468 mutex_spin_exit(&timer_lock); 1469 mutex_exit(proc_lock); 1470 } 1471 1472 /* 1473 * Check if the time will wrap if set to ts. 1474 * 1475 * ts - timespec describing the new time 1476 * delta - the delta between the current time and ts 1477 */ 1478 bool 1479 time_wraps(struct timespec *ts, struct timespec *delta) 1480 { 1481 1482 /* 1483 * Don't allow the time to be set forward so far it 1484 * will wrap and become negative, thus allowing an 1485 * attacker to bypass the next check below. The 1486 * cutoff is 1 year before rollover occurs, so even 1487 * if the attacker uses adjtime(2) to move the time 1488 * past the cutoff, it will take a very long time 1489 * to get to the wrap point. 1490 */ 1491 if ((ts->tv_sec > LLONG_MAX - 365*24*60*60) || 1492 (delta->tv_sec < 0 || delta->tv_nsec < 0)) 1493 return true; 1494 1495 return false; 1496 } 1497
Indexes created Wed Sep 24 05:09:52 GMT 2025