1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)kern_time.c 8.1 (Berkeley) 6/10/93 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/limits.h> 38 #include <sys/clock.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/sysproto.h> 42 #include <sys/eventhandler.h> 43 #include <sys/resourcevar.h> 44 #include <sys/signalvar.h> 45 #include <sys/kernel.h> 46 #include <sys/sleepqueue.h> 47 #include <sys/syscallsubr.h> 48 #include <sys/sysctl.h> 49 #include <sys/sysent.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/posix4.h> 53 #include <sys/time.h> 54 #include <sys/timers.h> 55 #include <sys/timetc.h> 56 #include <sys/vnode.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_extern.h> 60 61 #define MAX_CLOCKS (CLOCK_MONOTONIC+1) 62 #define CPUCLOCK_BIT 0x80000000 63 #define CPUCLOCK_PROCESS_BIT 0x40000000 64 #define CPUCLOCK_ID_MASK (~(CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT)) 65 #define MAKE_THREAD_CPUCLOCK(tid) (CPUCLOCK_BIT|(tid)) 66 #define MAKE_PROCESS_CPUCLOCK(pid) \ 67 (CPUCLOCK_BIT|CPUCLOCK_PROCESS_BIT|(pid)) 68 69 static struct kclock posix_clocks[MAX_CLOCKS]; 70 static uma_zone_t itimer_zone = NULL; 71 72 /* 73 * Time of day and interval timer support. 74 * 75 * These routines provide the kernel entry points to get and set 76 * the time-of-day and per-process interval timers. Subroutines 77 * here provide support for adding and subtracting timeval structures 78 * and decrementing interval timers, optionally reloading the interval 79 * timers when they expire. 80 */ 81 82 static int settime(struct thread *, struct timeval *); 83 static void timevalfix(struct timeval *); 84 85 static void itimer_start(void); 86 static int itimer_init(void *, int, int); 87 static void itimer_fini(void *, int); 88 static void itimer_enter(struct itimer *); 89 static void itimer_leave(struct itimer *); 90 static struct itimer *itimer_find(struct proc *, int); 91 static void itimers_alloc(struct proc *); 92 static void itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp); 93 static void itimers_event_hook_exit(void *arg, struct proc *p); 94 static int realtimer_create(struct itimer *); 95 static int realtimer_gettime(struct itimer *, struct itimerspec *); 96 static int realtimer_settime(struct itimer *, int, 97 struct itimerspec *, struct itimerspec *); 98 static int realtimer_delete(struct itimer *); 99 static void realtimer_clocktime(clockid_t, struct timespec *); 100 static void realtimer_expire(void *); 101 static int kern_timer_create(struct thread *, clockid_t, 102 struct sigevent *, int *, int); 103 static int kern_timer_delete(struct thread *, int); 104 105 int register_posix_clock(int, struct kclock *); 106 void itimer_fire(struct itimer *it); 107 int itimespecfix(struct timespec *ts); 108 109 #define CLOCK_CALL(clock, call, arglist) \ 110 ((*posix_clocks[clock].call) arglist) 111 112 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL); 113 114 115 static int 116 settime(struct thread *td, struct timeval *tv) 117 { 118 struct timeval delta, tv1, tv2; 119 static struct timeval maxtime, laststep; 120 struct timespec ts; 121 int s; 122 123 s = splclock(); 124 microtime(&tv1); 125 delta = *tv; 126 timevalsub(&delta, &tv1); 127 128 /* 129 * If the system is secure, we do not allow the time to be 130 * set to a value earlier than 1 second less than the highest 131 * time we have yet seen. The worst a miscreant can do in 132 * this circumstance is "freeze" time. He couldn't go 133 * back to the past. 134 * 135 * We similarly do not allow the clock to be stepped more 136 * than one second, nor more than once per second. This allows 137 * a miscreant to make the clock march double-time, but no worse. 138 */ 139 if (securelevel_gt(td->td_ucred, 1) != 0) { 140 if (delta.tv_sec < 0 || delta.tv_usec < 0) { 141 /* 142 * Update maxtime to latest time we've seen. 143 */ 144 if (tv1.tv_sec > maxtime.tv_sec) 145 maxtime = tv1; 146 tv2 = *tv; 147 timevalsub(&tv2, &maxtime); 148 if (tv2.tv_sec < -1) { 149 tv->tv_sec = maxtime.tv_sec - 1; 150 printf("Time adjustment clamped to -1 second\n"); 151 } 152 } else { 153 if (tv1.tv_sec == laststep.tv_sec) { 154 splx(s); 155 return (EPERM); 156 } 157 if (delta.tv_sec > 1) { 158 tv->tv_sec = tv1.tv_sec + 1; 159 printf("Time adjustment clamped to +1 second\n"); 160 } 161 laststep = *tv; 162 } 163 } 164 165 ts.tv_sec = tv->tv_sec; 166 ts.tv_nsec = tv->tv_usec * 1000; 167 mtx_lock(&Giant); 168 tc_setclock(&ts); 169 resettodr(); 170 mtx_unlock(&Giant); 171 return (0); 172 } 173 174 #ifndef _SYS_SYSPROTO_H_ 175 struct clock_getcpuclockid2_args { 176 id_t id; 177 int which, 178 clockid_t *clock_id; 179 }; 180 #endif 181 /* ARGSUSED */ 182 int 183 sys_clock_getcpuclockid2(struct thread *td, struct clock_getcpuclockid2_args *uap) 184 { 185 clockid_t clk_id; 186 struct proc *p; 187 pid_t pid; 188 lwpid_t tid; 189 int error; 190 191 switch(uap->which) { 192 case CPUCLOCK_WHICH_PID: 193 if (uap->id != 0) { 194 p = pfind(uap->id); 195 if (p == NULL) 196 return (ESRCH); 197 error = p_cansee(td, p); 198 PROC_UNLOCK(p); 199 if (error) 200 return (error); 201 pid = uap->id; 202 } else { 203 pid = td->td_proc->p_pid; 204 } 205 clk_id = MAKE_PROCESS_CPUCLOCK(pid); 206 break; 207 case CPUCLOCK_WHICH_TID: 208 if (uap->id == 0) 209 tid = td->td_tid; 210 else 211 tid = uap->id; 212 clk_id = MAKE_THREAD_CPUCLOCK(tid); 213 break; 214 default: 215 return (EINVAL); 216 } 217 return (copyout(&clk_id, uap->clock_id, sizeof(clockid_t))); 218 } 219 220 #ifndef _SYS_SYSPROTO_H_ 221 struct clock_gettime_args { 222 clockid_t clock_id; 223 struct timespec *tp; 224 }; 225 #endif 226 /* ARGSUSED */ 227 int 228 sys_clock_gettime(struct thread *td, struct clock_gettime_args *uap) 229 { 230 struct timespec ats; 231 int error; 232 233 error = kern_clock_gettime(td, uap->clock_id, &ats); 234 if (error == 0) 235 error = copyout(&ats, uap->tp, sizeof(ats)); 236 237 return (error); 238 } 239 240 static inline void 241 cputick2timespec(uint64_t runtime, struct timespec *ats) 242 { 243 runtime = cputick2usec(runtime); 244 ats->tv_sec = runtime / 1000000; 245 ats->tv_nsec = runtime % 1000000 * 1000; 246 } 247 248 static void 249 get_thread_cputime(struct thread *targettd, struct timespec *ats) 250 { 251 uint64_t runtime, curtime, switchtime; 252 253 if (targettd == NULL) { /* current thread */ 254 critical_enter(); 255 switchtime = PCPU_GET(switchtime); 256 curtime = cpu_ticks(); 257 runtime = curthread->td_runtime; 258 critical_exit(); 259 runtime += curtime - switchtime; 260 } else { 261 thread_lock(targettd); 262 runtime = targettd->td_runtime; 263 thread_unlock(targettd); 264 } 265 cputick2timespec(runtime, ats); 266 } 267 268 static void 269 get_process_cputime(struct proc *targetp, struct timespec *ats) 270 { 271 uint64_t runtime; 272 struct rusage ru; 273 274 PROC_SLOCK(targetp); 275 rufetch(targetp, &ru); 276 runtime = targetp->p_rux.rux_runtime; 277 PROC_SUNLOCK(targetp); 278 cputick2timespec(runtime, ats); 279 } 280 281 static int 282 get_cputime(struct thread *td, clockid_t clock_id, struct timespec *ats) 283 { 284 struct proc *p, *p2; 285 struct thread *td2; 286 lwpid_t tid; 287 pid_t pid; 288 int error; 289 290 p = td->td_proc; 291 if ((clock_id & CPUCLOCK_PROCESS_BIT) == 0) { 292 tid = clock_id & CPUCLOCK_ID_MASK; 293 td2 = tdfind(tid, p->p_pid); 294 if (td2 == NULL) 295 return (EINVAL); 296 get_thread_cputime(td2, ats); 297 PROC_UNLOCK(td2->td_proc); 298 } else { 299 pid = clock_id & CPUCLOCK_ID_MASK; 300 p2 = pfind(pid); 301 if (p2 == NULL) 302 return (EINVAL); 303 error = p_cansee(td, p2); 304 if (error) { 305 PROC_UNLOCK(p2); 306 return (EINVAL); 307 } 308 get_process_cputime(p2, ats); 309 PROC_UNLOCK(p2); 310 } 311 return (0); 312 } 313 314 int 315 kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats) 316 { 317 struct timeval sys, user; 318 struct proc *p; 319 320 p = td->td_proc; 321 switch (clock_id) { 322 case CLOCK_REALTIME: /* Default to precise. */ 323 case CLOCK_REALTIME_PRECISE: 324 nanotime(ats); 325 break; 326 case CLOCK_REALTIME_FAST: 327 getnanotime(ats); 328 break; 329 case CLOCK_VIRTUAL: 330 PROC_LOCK(p); 331 PROC_SLOCK(p); 332 calcru(p, &user, &sys); 333 PROC_SUNLOCK(p); 334 PROC_UNLOCK(p); 335 TIMEVAL_TO_TIMESPEC(&user, ats); 336 break; 337 case CLOCK_PROF: 338 PROC_LOCK(p); 339 PROC_SLOCK(p); 340 calcru(p, &user, &sys); 341 PROC_SUNLOCK(p); 342 PROC_UNLOCK(p); 343 timevaladd(&user, &sys); 344 TIMEVAL_TO_TIMESPEC(&user, ats); 345 break; 346 case CLOCK_MONOTONIC: /* Default to precise. */ 347 case CLOCK_MONOTONIC_PRECISE: 348 case CLOCK_UPTIME: 349 case CLOCK_UPTIME_PRECISE: 350 nanouptime(ats); 351 break; 352 case CLOCK_UPTIME_FAST: 353 case CLOCK_MONOTONIC_FAST: 354 getnanouptime(ats); 355 break; 356 case CLOCK_SECOND: 357 ats->tv_sec = time_second; 358 ats->tv_nsec = 0; 359 break; 360 case CLOCK_THREAD_CPUTIME_ID: 361 get_thread_cputime(NULL, ats); 362 break; 363 case CLOCK_PROCESS_CPUTIME_ID: 364 PROC_LOCK(p); 365 get_process_cputime(p, ats); 366 PROC_UNLOCK(p); 367 break; 368 default: 369 if ((int)clock_id >= 0) 370 return (EINVAL); 371 return (get_cputime(td, clock_id, ats)); 372 } 373 return (0); 374 } 375 376 #ifndef _SYS_SYSPROTO_H_ 377 struct clock_settime_args { 378 clockid_t clock_id; 379 const struct timespec *tp; 380 }; 381 #endif 382 /* ARGSUSED */ 383 int 384 sys_clock_settime(struct thread *td, struct clock_settime_args *uap) 385 { 386 struct timespec ats; 387 int error; 388 389 if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0) 390 return (error); 391 return (kern_clock_settime(td, uap->clock_id, &ats)); 392 } 393 394 int 395 kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats) 396 { 397 struct timeval atv; 398 int error; 399 400 if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0) 401 return (error); 402 if (clock_id != CLOCK_REALTIME) 403 return (EINVAL); 404 if (ats->tv_nsec < 0 || ats->tv_nsec >= 1000000000) 405 return (EINVAL); 406 /* XXX Don't convert nsec->usec and back */ 407 TIMESPEC_TO_TIMEVAL(&atv, ats); 408 error = settime(td, &atv); 409 return (error); 410 } 411 412 #ifndef _SYS_SYSPROTO_H_ 413 struct clock_getres_args { 414 clockid_t clock_id; 415 struct timespec *tp; 416 }; 417 #endif 418 int 419 sys_clock_getres(struct thread *td, struct clock_getres_args *uap) 420 { 421 struct timespec ts; 422 int error; 423 424 if (uap->tp == NULL) 425 return (0); 426 427 error = kern_clock_getres(td, uap->clock_id, &ts); 428 if (error == 0) 429 error = copyout(&ts, uap->tp, sizeof(ts)); 430 return (error); 431 } 432 433 int 434 kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts) 435 { 436 437 ts->tv_sec = 0; 438 switch (clock_id) { 439 case CLOCK_REALTIME: 440 case CLOCK_REALTIME_FAST: 441 case CLOCK_REALTIME_PRECISE: 442 case CLOCK_MONOTONIC: 443 case CLOCK_MONOTONIC_FAST: 444 case CLOCK_MONOTONIC_PRECISE: 445 case CLOCK_UPTIME: 446 case CLOCK_UPTIME_FAST: 447 case CLOCK_UPTIME_PRECISE: 448 /* 449 * Round up the result of the division cheaply by adding 1. 450 * Rounding up is especially important if rounding down 451 * would give 0. Perfect rounding is unimportant. 452 */ 453 ts->tv_nsec = 1000000000 / tc_getfrequency() + 1; 454 break; 455 case CLOCK_VIRTUAL: 456 case CLOCK_PROF: 457 /* Accurately round up here because we can do so cheaply. */ 458 ts->tv_nsec = (1000000000 + hz - 1) / hz; 459 break; 460 case CLOCK_SECOND: 461 ts->tv_sec = 1; 462 ts->tv_nsec = 0; 463 break; 464 case CLOCK_THREAD_CPUTIME_ID: 465 case CLOCK_PROCESS_CPUTIME_ID: 466 cputime: 467 /* sync with cputick2usec */ 468 ts->tv_nsec = 1000000 / cpu_tickrate(); 469 if (ts->tv_nsec == 0) 470 ts->tv_nsec = 1000; 471 break; 472 default: 473 if ((int)clock_id < 0) 474 goto cputime; 475 return (EINVAL); 476 } 477 return (0); 478 } 479 480 static uint8_t nanowait[MAXCPU]; 481 482 int 483 kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt) 484 { 485 struct timespec ts; 486 sbintime_t sbt, sbtt, prec, tmp; 487 time_t over; 488 int error; 489 490 if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000) 491 return (EINVAL); 492 if (rqt->tv_sec < 0 || (rqt->tv_sec == 0 && rqt->tv_nsec == 0)) 493 return (0); 494 ts = *rqt; 495 if (ts.tv_sec > INT32_MAX / 2) { 496 over = ts.tv_sec - INT32_MAX / 2; 497 ts.tv_sec -= over; 498 } else 499 over = 0; 500 tmp = tstosbt(ts); 501 prec = tmp; 502 prec >>= tc_precexp; 503 if (TIMESEL(&sbt, tmp)) 504 sbt += tc_tick_sbt; 505 sbt += tmp; 506 error = tsleep_sbt(&nanowait[curcpu], PWAIT | PCATCH, "nanslp", 507 sbt, prec, C_ABSOLUTE); 508 if (error != EWOULDBLOCK) { 509 if (error == ERESTART) 510 error = EINTR; 511 TIMESEL(&sbtt, tmp); 512 if (rmt != NULL) { 513 ts = sbttots(sbt - sbtt); 514 ts.tv_sec += over; 515 if (ts.tv_sec < 0) 516 timespecclear(&ts); 517 *rmt = ts; 518 } 519 if (sbtt >= sbt) 520 return (0); 521 return (error); 522 } 523 return (0); 524 } 525 526 #ifndef _SYS_SYSPROTO_H_ 527 struct nanosleep_args { 528 struct timespec *rqtp; 529 struct timespec *rmtp; 530 }; 531 #endif 532 /* ARGSUSED */ 533 int 534 sys_nanosleep(struct thread *td, struct nanosleep_args *uap) 535 { 536 struct timespec rmt, rqt; 537 int error; 538 539 error = copyin(uap->rqtp, &rqt, sizeof(rqt)); 540 if (error) 541 return (error); 542 543 if (uap->rmtp && 544 !useracc((caddr_t)uap->rmtp, sizeof(rmt), VM_PROT_WRITE)) 545 return (EFAULT); 546 error = kern_nanosleep(td, &rqt, &rmt); 547 if (error && uap->rmtp) { 548 int error2; 549 550 error2 = copyout(&rmt, uap->rmtp, sizeof(rmt)); 551 if (error2) 552 error = error2; 553 } 554 return (error); 555 } 556 557 #ifndef _SYS_SYSPROTO_H_ 558 struct gettimeofday_args { 559 struct timeval *tp; 560 struct timezone *tzp; 561 }; 562 #endif 563 /* ARGSUSED */ 564 int 565 sys_gettimeofday(struct thread *td, struct gettimeofday_args *uap) 566 { 567 struct timeval atv; 568 struct timezone rtz; 569 int error = 0; 570 571 if (uap->tp) { 572 microtime(&atv); 573 error = copyout(&atv, uap->tp, sizeof (atv)); 574 } 575 if (error == 0 && uap->tzp != NULL) { 576 rtz.tz_minuteswest = tz_minuteswest; 577 rtz.tz_dsttime = tz_dsttime; 578 error = copyout(&rtz, uap->tzp, sizeof (rtz)); 579 } 580 return (error); 581 } 582 583 #ifndef _SYS_SYSPROTO_H_ 584 struct settimeofday_args { 585 struct timeval *tv; 586 struct timezone *tzp; 587 }; 588 #endif 589 /* ARGSUSED */ 590 int 591 sys_settimeofday(struct thread *td, struct settimeofday_args *uap) 592 { 593 struct timeval atv, *tvp; 594 struct timezone atz, *tzp; 595 int error; 596 597 if (uap->tv) { 598 error = copyin(uap->tv, &atv, sizeof(atv)); 599 if (error) 600 return (error); 601 tvp = &atv; 602 } else 603 tvp = NULL; 604 if (uap->tzp) { 605 error = copyin(uap->tzp, &atz, sizeof(atz)); 606 if (error) 607 return (error); 608 tzp = &atz; 609 } else 610 tzp = NULL; 611 return (kern_settimeofday(td, tvp, tzp)); 612 } 613 614 int 615 kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp) 616 { 617 int error; 618 619 error = priv_check(td, PRIV_SETTIMEOFDAY); 620 if (error) 621 return (error); 622 /* Verify all parameters before changing time. */ 623 if (tv) { 624 if (tv->tv_usec < 0 || tv->tv_usec >= 1000000) 625 return (EINVAL); 626 error = settime(td, tv); 627 } 628 if (tzp && error == 0) { 629 tz_minuteswest = tzp->tz_minuteswest; 630 tz_dsttime = tzp->tz_dsttime; 631 } 632 return (error); 633 } 634 635 /* 636 * Get value of an interval timer. The process virtual and profiling virtual 637 * time timers are kept in the p_stats area, since they can be swapped out. 638 * These are kept internally in the way they are specified externally: in 639 * time until they expire. 640 * 641 * The real time interval timer is kept in the process table slot for the 642 * process, and its value (it_value) is kept as an absolute time rather than 643 * as a delta, so that it is easy to keep periodic real-time signals from 644 * drifting. 645 * 646 * Virtual time timers are processed in the hardclock() routine of 647 * kern_clock.c. The real time timer is processed by a timeout routine, 648 * called from the softclock() routine. Since a callout may be delayed in 649 * real time due to interrupt processing in the system, it is possible for 650 * the real time timeout routine (realitexpire, given below), to be delayed 651 * in real time past when it is supposed to occur. It does not suffice, 652 * therefore, to reload the real timer .it_value from the real time timers 653 * .it_interval. Rather, we compute the next time in absolute time the timer 654 * should go off. 655 */ 656 #ifndef _SYS_SYSPROTO_H_ 657 struct getitimer_args { 658 u_int which; 659 struct itimerval *itv; 660 }; 661 #endif 662 int 663 sys_getitimer(struct thread *td, struct getitimer_args *uap) 664 { 665 struct itimerval aitv; 666 int error; 667 668 error = kern_getitimer(td, uap->which, &aitv); 669 if (error != 0) 670 return (error); 671 return (copyout(&aitv, uap->itv, sizeof (struct itimerval))); 672 } 673 674 int 675 kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv) 676 { 677 struct proc *p = td->td_proc; 678 struct timeval ctv; 679 680 if (which > ITIMER_PROF) 681 return (EINVAL); 682 683 if (which == ITIMER_REAL) { 684 /* 685 * Convert from absolute to relative time in .it_value 686 * part of real time timer. If time for real time timer 687 * has passed return 0, else return difference between 688 * current time and time for the timer to go off. 689 */ 690 PROC_LOCK(p); 691 *aitv = p->p_realtimer; 692 PROC_UNLOCK(p); 693 if (timevalisset(&aitv->it_value)) { 694 microuptime(&ctv); 695 if (timevalcmp(&aitv->it_value, &ctv, <)) 696 timevalclear(&aitv->it_value); 697 else 698 timevalsub(&aitv->it_value, &ctv); 699 } 700 } else { 701 PROC_SLOCK(p); 702 *aitv = p->p_stats->p_timer[which]; 703 PROC_SUNLOCK(p); 704 } 705 return (0); 706 } 707 708 #ifndef _SYS_SYSPROTO_H_ 709 struct setitimer_args { 710 u_int which; 711 struct itimerval *itv, *oitv; 712 }; 713 #endif 714 int 715 sys_setitimer(struct thread *td, struct setitimer_args *uap) 716 { 717 struct itimerval aitv, oitv; 718 int error; 719 720 if (uap->itv == NULL) { 721 uap->itv = uap->oitv; 722 return (sys_getitimer(td, (struct getitimer_args *)uap)); 723 } 724 725 if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval)))) 726 return (error); 727 error = kern_setitimer(td, uap->which, &aitv, &oitv); 728 if (error != 0 || uap->oitv == NULL) 729 return (error); 730 return (copyout(&oitv, uap->oitv, sizeof(struct itimerval))); 731 } 732 733 int 734 kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv, 735 struct itimerval *oitv) 736 { 737 struct proc *p = td->td_proc; 738 struct timeval ctv; 739 sbintime_t sbt, pr; 740 741 if (aitv == NULL) 742 return (kern_getitimer(td, which, oitv)); 743 744 if (which > ITIMER_PROF) 745 return (EINVAL); 746 if (itimerfix(&aitv->it_value) || 747 aitv->it_value.tv_sec > INT32_MAX / 2) 748 return (EINVAL); 749 if (!timevalisset(&aitv->it_value)) 750 timevalclear(&aitv->it_interval); 751 else if (itimerfix(&aitv->it_interval) || 752 aitv->it_interval.tv_sec > INT32_MAX / 2) 753 return (EINVAL); 754 755 if (which == ITIMER_REAL) { 756 PROC_LOCK(p); 757 if (timevalisset(&p->p_realtimer.it_value)) 758 callout_stop(&p->p_itcallout); 759 microuptime(&ctv); 760 if (timevalisset(&aitv->it_value)) { 761 pr = tvtosbt(aitv->it_value) >> tc_precexp; 762 timevaladd(&aitv->it_value, &ctv); 763 sbt = tvtosbt(aitv->it_value); 764 callout_reset_sbt(&p->p_itcallout, sbt, pr, 765 realitexpire, p, C_ABSOLUTE); 766 } 767 *oitv = p->p_realtimer; 768 p->p_realtimer = *aitv; 769 PROC_UNLOCK(p); 770 if (timevalisset(&oitv->it_value)) { 771 if (timevalcmp(&oitv->it_value, &ctv, <)) 772 timevalclear(&oitv->it_value); 773 else 774 timevalsub(&oitv->it_value, &ctv); 775 } 776 } else { 777 PROC_SLOCK(p); 778 *oitv = p->p_stats->p_timer[which]; 779 p->p_stats->p_timer[which] = *aitv; 780 PROC_SUNLOCK(p); 781 } 782 return (0); 783 } 784 785 /* 786 * Real interval timer expired: 787 * send process whose timer expired an alarm signal. 788 * If time is not set up to reload, then just return. 789 * Else compute next time timer should go off which is > current time. 790 * This is where delay in processing this timeout causes multiple 791 * SIGALRM calls to be compressed into one. 792 * tvtohz() always adds 1 to allow for the time until the next clock 793 * interrupt being strictly less than 1 clock tick, but we don't want 794 * that here since we want to appear to be in sync with the clock 795 * interrupt even when we're delayed. 796 */ 797 void 798 realitexpire(void *arg) 799 { 800 struct proc *p; 801 struct timeval ctv; 802 sbintime_t isbt; 803 804 p = (struct proc *)arg; 805 kern_psignal(p, SIGALRM); 806 if (!timevalisset(&p->p_realtimer.it_interval)) { 807 timevalclear(&p->p_realtimer.it_value); 808 if (p->p_flag & P_WEXIT) 809 wakeup(&p->p_itcallout); 810 return; 811 } 812 isbt = tvtosbt(p->p_realtimer.it_interval); 813 if (isbt >= sbt_timethreshold) 814 getmicrouptime(&ctv); 815 else 816 microuptime(&ctv); 817 do { 818 timevaladd(&p->p_realtimer.it_value, 819 &p->p_realtimer.it_interval); 820 } while (timevalcmp(&p->p_realtimer.it_value, &ctv, <=)); 821 callout_reset_sbt(&p->p_itcallout, tvtosbt(p->p_realtimer.it_value), 822 isbt >> tc_precexp, realitexpire, p, C_ABSOLUTE); 823 } 824 825 /* 826 * Check that a proposed value to load into the .it_value or 827 * .it_interval part of an interval timer is acceptable, and 828 * fix it to have at least minimal value (i.e. if it is less 829 * than the resolution of the clock, round it up.) 830 */ 831 int 832 itimerfix(struct timeval *tv) 833 { 834 835 if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000) 836 return (EINVAL); 837 if (tv->tv_sec == 0 && tv->tv_usec != 0 && 838 tv->tv_usec < (u_int)tick / 16) 839 tv->tv_usec = (u_int)tick / 16; 840 return (0); 841 } 842 843 /* 844 * Decrement an interval timer by a specified number 845 * of microseconds, which must be less than a second, 846 * i.e. < 1000000. If the timer expires, then reload 847 * it. In this case, carry over (usec - old value) to 848 * reduce the value reloaded into the timer so that 849 * the timer does not drift. This routine assumes 850 * that it is called in a context where the timers 851 * on which it is operating cannot change in value. 852 */ 853 int 854 itimerdecr(struct itimerval *itp, int usec) 855 { 856 857 if (itp->it_value.tv_usec < usec) { 858 if (itp->it_value.tv_sec == 0) { 859 /* expired, and already in next interval */ 860 usec -= itp->it_value.tv_usec; 861 goto expire; 862 } 863 itp->it_value.tv_usec += 1000000; 864 itp->it_value.tv_sec--; 865 } 866 itp->it_value.tv_usec -= usec; 867 usec = 0; 868 if (timevalisset(&itp->it_value)) 869 return (1); 870 /* expired, exactly at end of interval */ 871 expire: 872 if (timevalisset(&itp->it_interval)) { 873 itp->it_value = itp->it_interval; 874 itp->it_value.tv_usec -= usec; 875 if (itp->it_value.tv_usec < 0) { 876 itp->it_value.tv_usec += 1000000; 877 itp->it_value.tv_sec--; 878 } 879 } else 880 itp->it_value.tv_usec = 0; /* sec is already 0 */ 881 return (0); 882 } 883 884 /* 885 * Add and subtract routines for timevals. 886 * N.B.: subtract routine doesn't deal with 887 * results which are before the beginning, 888 * it just gets very confused in this case. 889 * Caveat emptor. 890 */ 891 void 892 timevaladd(struct timeval *t1, const struct timeval *t2) 893 { 894 895 t1->tv_sec += t2->tv_sec; 896 t1->tv_usec += t2->tv_usec; 897 timevalfix(t1); 898 } 899 900 void 901 timevalsub(struct timeval *t1, const struct timeval *t2) 902 { 903 904 t1->tv_sec -= t2->tv_sec; 905 t1->tv_usec -= t2->tv_usec; 906 timevalfix(t1); 907 } 908 909 static void 910 timevalfix(struct timeval *t1) 911 { 912 913 if (t1->tv_usec < 0) { 914 t1->tv_sec--; 915 t1->tv_usec += 1000000; 916 } 917 if (t1->tv_usec >= 1000000) { 918 t1->tv_sec++; 919 t1->tv_usec -= 1000000; 920 } 921 } 922 923 /* 924 * ratecheck(): simple time-based rate-limit checking. 925 */ 926 int 927 ratecheck(struct timeval *lasttime, const struct timeval *mininterval) 928 { 929 struct timeval tv, delta; 930 int rv = 0; 931 932 getmicrouptime(&tv); /* NB: 10ms precision */ 933 delta = tv; 934 timevalsub(&delta, lasttime); 935 936 /* 937 * check for 0,0 is so that the message will be seen at least once, 938 * even if interval is huge. 939 */ 940 if (timevalcmp(&delta, mininterval, >=) || 941 (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) { 942 *lasttime = tv; 943 rv = 1; 944 } 945 946 return (rv); 947 } 948 949 /* 950 * ppsratecheck(): packets (or events) per second limitation. 951 * 952 * Return 0 if the limit is to be enforced (e.g. the caller 953 * should drop a packet because of the rate limitation). 954 * 955 * maxpps of 0 always causes zero to be returned. maxpps of -1 956 * always causes 1 to be returned; this effectively defeats rate 957 * limiting. 958 * 959 * Note that we maintain the struct timeval for compatibility 960 * with other bsd systems. We reuse the storage and just monitor 961 * clock ticks for minimal overhead. 962 */ 963 int 964 ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps) 965 { 966 int now; 967 968 /* 969 * Reset the last time and counter if this is the first call 970 * or more than a second has passed since the last update of 971 * lasttime. 972 */ 973 now = ticks; 974 if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) { 975 lasttime->tv_sec = now; 976 *curpps = 1; 977 return (maxpps != 0); 978 } else { 979 (*curpps)++; /* NB: ignore potential overflow */ 980 return (maxpps < 0 || *curpps < maxpps); 981 } 982 } 983 984 static void 985 itimer_start(void) 986 { 987 struct kclock rt_clock = { 988 .timer_create = realtimer_create, 989 .timer_delete = realtimer_delete, 990 .timer_settime = realtimer_settime, 991 .timer_gettime = realtimer_gettime, 992 .event_hook = NULL 993 }; 994 995 itimer_zone = uma_zcreate("itimer", sizeof(struct itimer), 996 NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0); 997 register_posix_clock(CLOCK_REALTIME, &rt_clock); 998 register_posix_clock(CLOCK_MONOTONIC, &rt_clock); 999 p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L); 1000 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX); 1001 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX); 1002 EVENTHANDLER_REGISTER(process_exit, itimers_event_hook_exit, 1003 (void *)ITIMER_EV_EXIT, EVENTHANDLER_PRI_ANY); 1004 EVENTHANDLER_REGISTER(process_exec, itimers_event_hook_exec, 1005 (void *)ITIMER_EV_EXEC, EVENTHANDLER_PRI_ANY); 1006 } 1007 1008 int 1009 register_posix_clock(int clockid, struct kclock *clk) 1010 { 1011 if ((unsigned)clockid >= MAX_CLOCKS) { 1012 printf("%s: invalid clockid\n", __func__); 1013 return (0); 1014 } 1015 posix_clocks[clockid] = *clk; 1016 return (1); 1017 } 1018 1019 static int 1020 itimer_init(void *mem, int size, int flags) 1021 { 1022 struct itimer *it; 1023 1024 it = (struct itimer *)mem; 1025 mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF); 1026 return (0); 1027 } 1028 1029 static void 1030 itimer_fini(void *mem, int size) 1031 { 1032 struct itimer *it; 1033 1034 it = (struct itimer *)mem; 1035 mtx_destroy(&it->it_mtx); 1036 } 1037 1038 static void 1039 itimer_enter(struct itimer *it) 1040 { 1041 1042 mtx_assert(&it->it_mtx, MA_OWNED); 1043 it->it_usecount++; 1044 } 1045 1046 static void 1047 itimer_leave(struct itimer *it) 1048 { 1049 1050 mtx_assert(&it->it_mtx, MA_OWNED); 1051 KASSERT(it->it_usecount > 0, ("invalid it_usecount")); 1052 1053 if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0) 1054 wakeup(it); 1055 } 1056 1057 #ifndef _SYS_SYSPROTO_H_ 1058 struct ktimer_create_args { 1059 clockid_t clock_id; 1060 struct sigevent * evp; 1061 int * timerid; 1062 }; 1063 #endif 1064 int 1065 sys_ktimer_create(struct thread *td, struct ktimer_create_args *uap) 1066 { 1067 struct sigevent *evp1, ev; 1068 int id; 1069 int error; 1070 1071 if (uap->evp != NULL) { 1072 error = copyin(uap->evp, &ev, sizeof(ev)); 1073 if (error != 0) 1074 return (error); 1075 evp1 = &ev; 1076 } else 1077 evp1 = NULL; 1078 1079 error = kern_timer_create(td, uap->clock_id, evp1, &id, -1); 1080 1081 if (error == 0) { 1082 error = copyout(&id, uap->timerid, sizeof(int)); 1083 if (error != 0) 1084 kern_timer_delete(td, id); 1085 } 1086 return (error); 1087 } 1088 1089 static int 1090 kern_timer_create(struct thread *td, clockid_t clock_id, 1091 struct sigevent *evp, int *timerid, int preset_id) 1092 { 1093 struct proc *p = td->td_proc; 1094 struct itimer *it; 1095 int id; 1096 int error; 1097 1098 if (clock_id < 0 || clock_id >= MAX_CLOCKS) 1099 return (EINVAL); 1100 1101 if (posix_clocks[clock_id].timer_create == NULL) 1102 return (EINVAL); 1103 1104 if (evp != NULL) { 1105 if (evp->sigev_notify != SIGEV_NONE && 1106 evp->sigev_notify != SIGEV_SIGNAL && 1107 evp->sigev_notify != SIGEV_THREAD_ID) 1108 return (EINVAL); 1109 if ((evp->sigev_notify == SIGEV_SIGNAL || 1110 evp->sigev_notify == SIGEV_THREAD_ID) && 1111 !_SIG_VALID(evp->sigev_signo)) 1112 return (EINVAL); 1113 } 1114 1115 if (p->p_itimers == NULL) 1116 itimers_alloc(p); 1117 1118 it = uma_zalloc(itimer_zone, M_WAITOK); 1119 it->it_flags = 0; 1120 it->it_usecount = 0; 1121 it->it_active = 0; 1122 timespecclear(&it->it_time.it_value); 1123 timespecclear(&it->it_time.it_interval); 1124 it->it_overrun = 0; 1125 it->it_overrun_last = 0; 1126 it->it_clockid = clock_id; 1127 it->it_timerid = -1; 1128 it->it_proc = p; 1129 ksiginfo_init(&it->it_ksi); 1130 it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT; 1131 error = CLOCK_CALL(clock_id, timer_create, (it)); 1132 if (error != 0) 1133 goto out; 1134 1135 PROC_LOCK(p); 1136 if (preset_id != -1) { 1137 KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id")); 1138 id = preset_id; 1139 if (p->p_itimers->its_timers[id] != NULL) { 1140 PROC_UNLOCK(p); 1141 error = 0; 1142 goto out; 1143 } 1144 } else { 1145 /* 1146 * Find a free timer slot, skipping those reserved 1147 * for setitimer(). 1148 */ 1149 for (id = 3; id < TIMER_MAX; id++) 1150 if (p->p_itimers->its_timers[id] == NULL) 1151 break; 1152 if (id == TIMER_MAX) { 1153 PROC_UNLOCK(p); 1154 error = EAGAIN; 1155 goto out; 1156 } 1157 } 1158 it->it_timerid = id; 1159 p->p_itimers->its_timers[id] = it; 1160 if (evp != NULL) 1161 it->it_sigev = *evp; 1162 else { 1163 it->it_sigev.sigev_notify = SIGEV_SIGNAL; 1164 switch (clock_id) { 1165 default: 1166 case CLOCK_REALTIME: 1167 it->it_sigev.sigev_signo = SIGALRM; 1168 break; 1169 case CLOCK_VIRTUAL: 1170 it->it_sigev.sigev_signo = SIGVTALRM; 1171 break; 1172 case CLOCK_PROF: 1173 it->it_sigev.sigev_signo = SIGPROF; 1174 break; 1175 } 1176 it->it_sigev.sigev_value.sival_int = id; 1177 } 1178 1179 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || 1180 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { 1181 it->it_ksi.ksi_signo = it->it_sigev.sigev_signo; 1182 it->it_ksi.ksi_code = SI_TIMER; 1183 it->it_ksi.ksi_value = it->it_sigev.sigev_value; 1184 it->it_ksi.ksi_timerid = id; 1185 } 1186 PROC_UNLOCK(p); 1187 *timerid = id; 1188 return (0); 1189 1190 out: 1191 ITIMER_LOCK(it); 1192 CLOCK_CALL(it->it_clockid, timer_delete, (it)); 1193 ITIMER_UNLOCK(it); 1194 uma_zfree(itimer_zone, it); 1195 return (error); 1196 } 1197 1198 #ifndef _SYS_SYSPROTO_H_ 1199 struct ktimer_delete_args { 1200 int timerid; 1201 }; 1202 #endif 1203 int 1204 sys_ktimer_delete(struct thread *td, struct ktimer_delete_args *uap) 1205 { 1206 return (kern_timer_delete(td, uap->timerid)); 1207 } 1208 1209 static struct itimer * 1210 itimer_find(struct proc *p, int timerid) 1211 { 1212 struct itimer *it; 1213 1214 PROC_LOCK_ASSERT(p, MA_OWNED); 1215 if ((p->p_itimers == NULL) || 1216 (timerid < 0) || (timerid >= TIMER_MAX) || 1217 (it = p->p_itimers->its_timers[timerid]) == NULL) { 1218 return (NULL); 1219 } 1220 ITIMER_LOCK(it); 1221 if ((it->it_flags & ITF_DELETING) != 0) { 1222 ITIMER_UNLOCK(it); 1223 it = NULL; 1224 } 1225 return (it); 1226 } 1227 1228 static int 1229 kern_timer_delete(struct thread *td, int timerid) 1230 { 1231 struct proc *p = td->td_proc; 1232 struct itimer *it; 1233 1234 PROC_LOCK(p); 1235 it = itimer_find(p, timerid); 1236 if (it == NULL) { 1237 PROC_UNLOCK(p); 1238 return (EINVAL); 1239 } 1240 PROC_UNLOCK(p); 1241 1242 it->it_flags |= ITF_DELETING; 1243 while (it->it_usecount > 0) { 1244 it->it_flags |= ITF_WANTED; 1245 msleep(it, &it->it_mtx, PPAUSE, "itimer", 0); 1246 } 1247 it->it_flags &= ~ITF_WANTED; 1248 CLOCK_CALL(it->it_clockid, timer_delete, (it)); 1249 ITIMER_UNLOCK(it); 1250 1251 PROC_LOCK(p); 1252 if (KSI_ONQ(&it->it_ksi)) 1253 sigqueue_take(&it->it_ksi); 1254 p->p_itimers->its_timers[timerid] = NULL; 1255 PROC_UNLOCK(p); 1256 uma_zfree(itimer_zone, it); 1257 return (0); 1258 } 1259 1260 #ifndef _SYS_SYSPROTO_H_ 1261 struct ktimer_settime_args { 1262 int timerid; 1263 int flags; 1264 const struct itimerspec * value; 1265 struct itimerspec * ovalue; 1266 }; 1267 #endif 1268 int 1269 sys_ktimer_settime(struct thread *td, struct ktimer_settime_args *uap) 1270 { 1271 struct proc *p = td->td_proc; 1272 struct itimer *it; 1273 struct itimerspec val, oval, *ovalp; 1274 int error; 1275 1276 error = copyin(uap->value, &val, sizeof(val)); 1277 if (error != 0) 1278 return (error); 1279 1280 if (uap->ovalue != NULL) 1281 ovalp = &oval; 1282 else 1283 ovalp = NULL; 1284 1285 PROC_LOCK(p); 1286 if (uap->timerid < 3 || 1287 (it = itimer_find(p, uap->timerid)) == NULL) { 1288 PROC_UNLOCK(p); 1289 error = EINVAL; 1290 } else { 1291 PROC_UNLOCK(p); 1292 itimer_enter(it); 1293 error = CLOCK_CALL(it->it_clockid, timer_settime, 1294 (it, uap->flags, &val, ovalp)); 1295 itimer_leave(it); 1296 ITIMER_UNLOCK(it); 1297 } 1298 if (error == 0 && uap->ovalue != NULL) 1299 error = copyout(ovalp, uap->ovalue, sizeof(*ovalp)); 1300 return (error); 1301 } 1302 1303 #ifndef _SYS_SYSPROTO_H_ 1304 struct ktimer_gettime_args { 1305 int timerid; 1306 struct itimerspec * value; 1307 }; 1308 #endif 1309 int 1310 sys_ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap) 1311 { 1312 struct proc *p = td->td_proc; 1313 struct itimer *it; 1314 struct itimerspec val; 1315 int error; 1316 1317 PROC_LOCK(p); 1318 if (uap->timerid < 3 || 1319 (it = itimer_find(p, uap->timerid)) == NULL) { 1320 PROC_UNLOCK(p); 1321 error = EINVAL; 1322 } else { 1323 PROC_UNLOCK(p); 1324 itimer_enter(it); 1325 error = CLOCK_CALL(it->it_clockid, timer_gettime, 1326 (it, &val)); 1327 itimer_leave(it); 1328 ITIMER_UNLOCK(it); 1329 } 1330 if (error == 0) 1331 error = copyout(&val, uap->value, sizeof(val)); 1332 return (error); 1333 } 1334 1335 #ifndef _SYS_SYSPROTO_H_ 1336 struct timer_getoverrun_args { 1337 int timerid; 1338 }; 1339 #endif 1340 int 1341 sys_ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap) 1342 { 1343 struct proc *p = td->td_proc; 1344 struct itimer *it; 1345 int error ; 1346 1347 PROC_LOCK(p); 1348 if (uap->timerid < 3 || 1349 (it = itimer_find(p, uap->timerid)) == NULL) { 1350 PROC_UNLOCK(p); 1351 error = EINVAL; 1352 } else { 1353 td->td_retval[0] = it->it_overrun_last; 1354 ITIMER_UNLOCK(it); 1355 PROC_UNLOCK(p); 1356 error = 0; 1357 } 1358 return (error); 1359 } 1360 1361 static int 1362 realtimer_create(struct itimer *it) 1363 { 1364 callout_init_mtx(&it->it_callout, &it->it_mtx, 0); 1365 return (0); 1366 } 1367 1368 static int 1369 realtimer_delete(struct itimer *it) 1370 { 1371 mtx_assert(&it->it_mtx, MA_OWNED); 1372 1373 /* 1374 * clear timer's value and interval to tell realtimer_expire 1375 * to not rearm the timer. 1376 */ 1377 timespecclear(&it->it_time.it_value); 1378 timespecclear(&it->it_time.it_interval); 1379 ITIMER_UNLOCK(it); 1380 callout_drain(&it->it_callout); 1381 ITIMER_LOCK(it); 1382 return (0); 1383 } 1384 1385 static int 1386 realtimer_gettime(struct itimer *it, struct itimerspec *ovalue) 1387 { 1388 struct timespec cts; 1389 1390 mtx_assert(&it->it_mtx, MA_OWNED); 1391 1392 realtimer_clocktime(it->it_clockid, &cts); 1393 *ovalue = it->it_time; 1394 if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) { 1395 timespecsub(&ovalue->it_value, &cts); 1396 if (ovalue->it_value.tv_sec < 0 || 1397 (ovalue->it_value.tv_sec == 0 && 1398 ovalue->it_value.tv_nsec == 0)) { 1399 ovalue->it_value.tv_sec = 0; 1400 ovalue->it_value.tv_nsec = 1; 1401 } 1402 } 1403 return (0); 1404 } 1405 1406 static int 1407 realtimer_settime(struct itimer *it, int flags, 1408 struct itimerspec *value, struct itimerspec *ovalue) 1409 { 1410 struct timespec cts, ts; 1411 struct timeval tv; 1412 struct itimerspec val; 1413 1414 mtx_assert(&it->it_mtx, MA_OWNED); 1415 1416 val = *value; 1417 if (itimespecfix(&val.it_value)) 1418 return (EINVAL); 1419 1420 if (timespecisset(&val.it_value)) { 1421 if (itimespecfix(&val.it_interval)) 1422 return (EINVAL); 1423 } else { 1424 timespecclear(&val.it_interval); 1425 } 1426 1427 if (ovalue != NULL) 1428 realtimer_gettime(it, ovalue); 1429 1430 it->it_time = val; 1431 if (timespecisset(&val.it_value)) { 1432 realtimer_clocktime(it->it_clockid, &cts); 1433 ts = val.it_value; 1434 if ((flags & TIMER_ABSTIME) == 0) { 1435 /* Convert to absolute time. */ 1436 timespecadd(&it->it_time.it_value, &cts); 1437 } else { 1438 timespecsub(&ts, &cts); 1439 /* 1440 * We don't care if ts is negative, tztohz will 1441 * fix it. 1442 */ 1443 } 1444 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1445 callout_reset(&it->it_callout, tvtohz(&tv), 1446 realtimer_expire, it); 1447 } else { 1448 callout_stop(&it->it_callout); 1449 } 1450 1451 return (0); 1452 } 1453 1454 static void 1455 realtimer_clocktime(clockid_t id, struct timespec *ts) 1456 { 1457 if (id == CLOCK_REALTIME) 1458 getnanotime(ts); 1459 else /* CLOCK_MONOTONIC */ 1460 getnanouptime(ts); 1461 } 1462 1463 int 1464 itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi) 1465 { 1466 struct itimer *it; 1467 1468 PROC_LOCK_ASSERT(p, MA_OWNED); 1469 it = itimer_find(p, timerid); 1470 if (it != NULL) { 1471 ksi->ksi_overrun = it->it_overrun; 1472 it->it_overrun_last = it->it_overrun; 1473 it->it_overrun = 0; 1474 ITIMER_UNLOCK(it); 1475 return (0); 1476 } 1477 return (EINVAL); 1478 } 1479 1480 int 1481 itimespecfix(struct timespec *ts) 1482 { 1483 1484 if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 1485 return (EINVAL); 1486 if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000) 1487 ts->tv_nsec = tick * 1000; 1488 return (0); 1489 } 1490 1491 /* Timeout callback for realtime timer */ 1492 static void 1493 realtimer_expire(void *arg) 1494 { 1495 struct timespec cts, ts; 1496 struct timeval tv; 1497 struct itimer *it; 1498 1499 it = (struct itimer *)arg; 1500 1501 realtimer_clocktime(it->it_clockid, &cts); 1502 /* Only fire if time is reached. */ 1503 if (timespeccmp(&cts, &it->it_time.it_value, >=)) { 1504 if (timespecisset(&it->it_time.it_interval)) { 1505 timespecadd(&it->it_time.it_value, 1506 &it->it_time.it_interval); 1507 while (timespeccmp(&cts, &it->it_time.it_value, >=)) { 1508 if (it->it_overrun < INT_MAX) 1509 it->it_overrun++; 1510 else 1511 it->it_ksi.ksi_errno = ERANGE; 1512 timespecadd(&it->it_time.it_value, 1513 &it->it_time.it_interval); 1514 } 1515 } else { 1516 /* single shot timer ? */ 1517 timespecclear(&it->it_time.it_value); 1518 } 1519 if (timespecisset(&it->it_time.it_value)) { 1520 ts = it->it_time.it_value; 1521 timespecsub(&ts, &cts); 1522 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1523 callout_reset(&it->it_callout, tvtohz(&tv), 1524 realtimer_expire, it); 1525 } 1526 itimer_enter(it); 1527 ITIMER_UNLOCK(it); 1528 itimer_fire(it); 1529 ITIMER_LOCK(it); 1530 itimer_leave(it); 1531 } else if (timespecisset(&it->it_time.it_value)) { 1532 ts = it->it_time.it_value; 1533 timespecsub(&ts, &cts); 1534 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1535 callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire, 1536 it); 1537 } 1538 } 1539 1540 void 1541 itimer_fire(struct itimer *it) 1542 { 1543 struct proc *p = it->it_proc; 1544 struct thread *td; 1545 1546 if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || 1547 it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { 1548 if (sigev_findtd(p, &it->it_sigev, &td) != 0) { 1549 ITIMER_LOCK(it); 1550 timespecclear(&it->it_time.it_value); 1551 timespecclear(&it->it_time.it_interval); 1552 callout_stop(&it->it_callout); 1553 ITIMER_UNLOCK(it); 1554 return; 1555 } 1556 if (!KSI_ONQ(&it->it_ksi)) { 1557 it->it_ksi.ksi_errno = 0; 1558 ksiginfo_set_sigev(&it->it_ksi, &it->it_sigev); 1559 tdsendsignal(p, td, it->it_ksi.ksi_signo, &it->it_ksi); 1560 } else { 1561 if (it->it_overrun < INT_MAX) 1562 it->it_overrun++; 1563 else 1564 it->it_ksi.ksi_errno = ERANGE; 1565 } 1566 PROC_UNLOCK(p); 1567 } 1568 } 1569 1570 static void 1571 itimers_alloc(struct proc *p) 1572 { 1573 struct itimers *its; 1574 int i; 1575 1576 its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO); 1577 LIST_INIT(&its->its_virtual); 1578 LIST_INIT(&its->its_prof); 1579 TAILQ_INIT(&its->its_worklist); 1580 for (i = 0; i < TIMER_MAX; i++) 1581 its->its_timers[i] = NULL; 1582 PROC_LOCK(p); 1583 if (p->p_itimers == NULL) { 1584 p->p_itimers = its; 1585 PROC_UNLOCK(p); 1586 } 1587 else { 1588 PROC_UNLOCK(p); 1589 free(its, M_SUBPROC); 1590 } 1591 } 1592 1593 static void 1594 itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp __unused) 1595 { 1596 itimers_event_hook_exit(arg, p); 1597 } 1598 1599 /* Clean up timers when some process events are being triggered. */ 1600 static void 1601 itimers_event_hook_exit(void *arg, struct proc *p) 1602 { 1603 struct itimers *its; 1604 struct itimer *it; 1605 int event = (int)(intptr_t)arg; 1606 int i; 1607 1608 if (p->p_itimers != NULL) { 1609 its = p->p_itimers; 1610 for (i = 0; i < MAX_CLOCKS; ++i) { 1611 if (posix_clocks[i].event_hook != NULL) 1612 CLOCK_CALL(i, event_hook, (p, i, event)); 1613 } 1614 /* 1615 * According to susv3, XSI interval timers should be inherited 1616 * by new image. 1617 */ 1618 if (event == ITIMER_EV_EXEC) 1619 i = 3; 1620 else if (event == ITIMER_EV_EXIT) 1621 i = 0; 1622 else 1623 panic("unhandled event"); 1624 for (; i < TIMER_MAX; ++i) { 1625 if ((it = its->its_timers[i]) != NULL) 1626 kern_timer_delete(curthread, i); 1627 } 1628 if (its->its_timers[0] == NULL && 1629 its->its_timers[1] == NULL && 1630 its->its_timers[2] == NULL) { 1631 free(its, M_SUBPROC); 1632 p->p_itimers = NULL; 1633 } 1634 } 1635 } 1636