Annotation of src/sys/kern/kern_time.c, Revision 1.50
1.50 ! itojun 1: /* $NetBSD: kern_time.c,v 1.49 2000/07/09 06:40:08 itojun Exp $ */
1.42 cgd 2:
3: /*-
4: * Copyright (c) 2000 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.
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: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the NetBSD
21: * Foundation, Inc. and its contributors.
22: * 4. Neither the name of The NetBSD Foundation nor the names of its
23: * contributors may be used to endorse or promote products derived
24: * from this software without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: * POSSIBILITY OF SUCH DAMAGE.
37: */
1.9 cgd 38:
1.1 cgd 39: /*
1.8 cgd 40: * Copyright (c) 1982, 1986, 1989, 1993
41: * The Regents of the University of California. All rights reserved.
1.1 cgd 42: *
43: * Redistribution and use in source and binary forms, with or without
44: * modification, are permitted provided that the following conditions
45: * are met:
46: * 1. Redistributions of source code must retain the above copyright
47: * notice, this list of conditions and the following disclaimer.
48: * 2. Redistributions in binary form must reproduce the above copyright
49: * notice, this list of conditions and the following disclaimer in the
50: * documentation and/or other materials provided with the distribution.
51: * 3. All advertising materials mentioning features or use of this software
52: * must display the following acknowledgement:
53: * This product includes software developed by the University of
54: * California, Berkeley and its contributors.
55: * 4. Neither the name of the University nor the names of its contributors
56: * may be used to endorse or promote products derived from this software
57: * without specific prior written permission.
58: *
59: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69: * SUCH DAMAGE.
70: *
1.33 fvdl 71: * @(#)kern_time.c 8.4 (Berkeley) 5/26/95
1.1 cgd 72: */
1.31 thorpej 73:
74: #include "fs_nfs.h"
1.34 thorpej 75: #include "opt_nfsserver.h"
1.1 cgd 76:
1.5 mycroft 77: #include <sys/param.h>
78: #include <sys/resourcevar.h>
79: #include <sys/kernel.h>
1.8 cgd 80: #include <sys/systm.h>
1.5 mycroft 81: #include <sys/proc.h>
1.8 cgd 82: #include <sys/vnode.h>
1.17 christos 83: #include <sys/signalvar.h>
1.25 perry 84: #include <sys/syslog.h>
1.1 cgd 85:
1.11 cgd 86: #include <sys/mount.h>
87: #include <sys/syscallargs.h>
1.19 christos 88:
1.37 thorpej 89: #include <uvm/uvm_extern.h>
90:
1.26 thorpej 91: #if defined(NFS) || defined(NFSSERVER)
1.20 fvdl 92: #include <nfs/rpcv2.h>
93: #include <nfs/nfsproto.h>
1.19 christos 94: #include <nfs/nfs_var.h>
95: #endif
1.17 christos 96:
1.5 mycroft 97: #include <machine/cpu.h>
1.23 cgd 98:
99: /*
1.1 cgd 100: * Time of day and interval timer support.
101: *
102: * These routines provide the kernel entry points to get and set
103: * the time-of-day and per-process interval timers. Subroutines
104: * here provide support for adding and subtracting timeval structures
105: * and decrementing interval timers, optionally reloading the interval
106: * timers when they expire.
107: */
108:
1.22 jtc 109: /* This function is used by clock_settime and settimeofday */
1.39 tron 110: int
1.22 jtc 111: settime(tv)
112: struct timeval *tv;
113: {
114: struct timeval delta;
1.47 thorpej 115: struct cpu_info *ci;
1.22 jtc 116: int s;
117:
118: /* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */
119: s = splclock();
120: timersub(tv, &time, &delta);
1.29 tls 121: if ((delta.tv_sec < 0 || delta.tv_usec < 0) && securelevel > 1)
122: return (EPERM);
123: #ifdef notyet
124: if ((delta.tv_sec < 86400) && securelevel > 0)
125: return (EPERM);
126: #endif
1.22 jtc 127: time = *tv;
1.38 thorpej 128: (void) spllowersoftclock();
1.22 jtc 129: timeradd(&boottime, &delta, &boottime);
1.47 thorpej 130: /*
131: * XXXSMP
132: * This is wrong. We should traverse a list of all
133: * CPUs and add the delta to the runtime of those
134: * CPUs which have a process on them.
135: */
136: ci = curcpu();
137: timeradd(&ci->ci_schedstate.spc_runtime, &delta,
138: &ci->ci_schedstate.spc_runtime);
1.26 thorpej 139: # if defined(NFS) || defined(NFSSERVER)
1.22 jtc 140: nqnfs_lease_updatetime(delta.tv_sec);
141: # endif
142: splx(s);
143: resettodr();
1.29 tls 144: return (0);
1.22 jtc 145: }
146:
147: /* ARGSUSED */
148: int
149: sys_clock_gettime(p, v, retval)
150: struct proc *p;
151: void *v;
152: register_t *retval;
153: {
1.45 augustss 154: struct sys_clock_gettime_args /* {
1.22 jtc 155: syscallarg(clockid_t) clock_id;
1.23 cgd 156: syscallarg(struct timespec *) tp;
157: } */ *uap = v;
1.22 jtc 158: clockid_t clock_id;
159: struct timeval atv;
160: struct timespec ats;
161:
162: clock_id = SCARG(uap, clock_id);
163: if (clock_id != CLOCK_REALTIME)
164: return (EINVAL);
165:
166: microtime(&atv);
167: TIMEVAL_TO_TIMESPEC(&atv,&ats);
168:
1.24 cgd 169: return copyout(&ats, SCARG(uap, tp), sizeof(ats));
1.22 jtc 170: }
171:
172: /* ARGSUSED */
173: int
174: sys_clock_settime(p, v, retval)
175: struct proc *p;
176: void *v;
177: register_t *retval;
178: {
1.45 augustss 179: struct sys_clock_settime_args /* {
1.22 jtc 180: syscallarg(clockid_t) clock_id;
1.23 cgd 181: syscallarg(const struct timespec *) tp;
182: } */ *uap = v;
1.22 jtc 183: clockid_t clock_id;
184: struct timeval atv;
185: struct timespec ats;
186: int error;
187:
188: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
189: return (error);
190:
191: clock_id = SCARG(uap, clock_id);
192: if (clock_id != CLOCK_REALTIME)
193: return (EINVAL);
194:
1.24 cgd 195: if ((error = copyin(SCARG(uap, tp), &ats, sizeof(ats))) != 0)
1.23 cgd 196: return (error);
1.22 jtc 197:
198: TIMESPEC_TO_TIMEVAL(&atv,&ats);
1.29 tls 199: if ((error = settime(&atv)))
200: return (error);
1.22 jtc 201:
202: return 0;
203: }
204:
205: int
206: sys_clock_getres(p, v, retval)
207: struct proc *p;
208: void *v;
209: register_t *retval;
210: {
1.45 augustss 211: struct sys_clock_getres_args /* {
1.22 jtc 212: syscallarg(clockid_t) clock_id;
1.23 cgd 213: syscallarg(struct timespec *) tp;
214: } */ *uap = v;
1.22 jtc 215: clockid_t clock_id;
216: struct timespec ts;
217: int error = 0;
218:
219: clock_id = SCARG(uap, clock_id);
220: if (clock_id != CLOCK_REALTIME)
221: return (EINVAL);
222:
223: if (SCARG(uap, tp)) {
224: ts.tv_sec = 0;
225: ts.tv_nsec = 1000000000 / hz;
226:
1.35 perry 227: error = copyout(&ts, SCARG(uap, tp), sizeof(ts));
1.22 jtc 228: }
229:
230: return error;
231: }
232:
1.27 jtc 233: /* ARGSUSED */
234: int
235: sys_nanosleep(p, v, retval)
236: struct proc *p;
237: void *v;
238: register_t *retval;
239: {
240: static int nanowait;
1.45 augustss 241: struct sys_nanosleep_args/* {
1.27 jtc 242: syscallarg(struct timespec *) rqtp;
243: syscallarg(struct timespec *) rmtp;
244: } */ *uap = v;
245: struct timespec rqt;
246: struct timespec rmt;
247: struct timeval atv, utv;
248: int error, s, timo;
249:
250: error = copyin((caddr_t)SCARG(uap, rqtp), (caddr_t)&rqt,
251: sizeof(struct timespec));
252: if (error)
253: return (error);
254:
255: TIMESPEC_TO_TIMEVAL(&atv,&rqt)
256: if (itimerfix(&atv))
257: return (EINVAL);
258:
259: s = splclock();
260: timeradd(&atv,&time,&atv);
261: timo = hzto(&atv);
262: /*
263: * Avoid inadvertantly sleeping forever
264: */
265: if (timo == 0)
266: timo = 1;
267: splx(s);
268:
269: error = tsleep(&nanowait, PWAIT | PCATCH, "nanosleep", timo);
270: if (error == ERESTART)
271: error = EINTR;
272: if (error == EWOULDBLOCK)
273: error = 0;
274:
275: if (SCARG(uap, rmtp)) {
1.28 jtc 276: int error;
277:
1.27 jtc 278: s = splclock();
279: utv = time;
280: splx(s);
281:
282: timersub(&atv, &utv, &utv);
283: if (utv.tv_sec < 0)
284: timerclear(&utv);
285:
286: TIMEVAL_TO_TIMESPEC(&utv,&rmt);
287: error = copyout((caddr_t)&rmt, (caddr_t)SCARG(uap,rmtp),
1.28 jtc 288: sizeof(rmt));
289: if (error)
290: return (error);
1.27 jtc 291: }
292:
293: return error;
294: }
1.22 jtc 295:
1.1 cgd 296: /* ARGSUSED */
1.3 andrew 297: int
1.16 mycroft 298: sys_gettimeofday(p, v, retval)
1.1 cgd 299: struct proc *p;
1.15 thorpej 300: void *v;
301: register_t *retval;
302: {
1.45 augustss 303: struct sys_gettimeofday_args /* {
1.11 cgd 304: syscallarg(struct timeval *) tp;
305: syscallarg(struct timezone *) tzp;
1.15 thorpej 306: } */ *uap = v;
1.1 cgd 307: struct timeval atv;
308: int error = 0;
1.25 perry 309: struct timezone tzfake;
1.1 cgd 310:
1.11 cgd 311: if (SCARG(uap, tp)) {
1.1 cgd 312: microtime(&atv);
1.35 perry 313: error = copyout(&atv, SCARG(uap, tp), sizeof(atv));
1.17 christos 314: if (error)
1.1 cgd 315: return (error);
316: }
1.25 perry 317: if (SCARG(uap, tzp)) {
318: /*
1.32 mycroft 319: * NetBSD has no kernel notion of time zone, so we just
1.25 perry 320: * fake up a timezone struct and return it if demanded.
321: */
322: tzfake.tz_minuteswest = 0;
323: tzfake.tz_dsttime = 0;
1.35 perry 324: error = copyout(&tzfake, SCARG(uap, tzp), sizeof(tzfake));
1.25 perry 325: }
1.1 cgd 326: return (error);
327: }
328:
329: /* ARGSUSED */
1.3 andrew 330: int
1.16 mycroft 331: sys_settimeofday(p, v, retval)
1.1 cgd 332: struct proc *p;
1.15 thorpej 333: void *v;
334: register_t *retval;
335: {
1.16 mycroft 336: struct sys_settimeofday_args /* {
1.24 cgd 337: syscallarg(const struct timeval *) tv;
338: syscallarg(const struct timezone *) tzp;
1.15 thorpej 339: } */ *uap = v;
1.22 jtc 340: struct timeval atv;
1.1 cgd 341: struct timezone atz;
1.22 jtc 342: int error;
1.1 cgd 343:
1.17 christos 344: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
1.1 cgd 345: return (error);
1.8 cgd 346: /* Verify all parameters before changing time. */
1.24 cgd 347: if (SCARG(uap, tv) && (error = copyin(SCARG(uap, tv),
348: &atv, sizeof(atv))))
1.8 cgd 349: return (error);
1.25 perry 350: /* XXX since we don't use tz, probably no point in doing copyin. */
1.24 cgd 351: if (SCARG(uap, tzp) && (error = copyin(SCARG(uap, tzp),
352: &atz, sizeof(atz))))
1.8 cgd 353: return (error);
1.22 jtc 354: if (SCARG(uap, tv))
1.29 tls 355: if ((error = settime(&atv)))
356: return (error);
1.25 perry 357: /*
1.32 mycroft 358: * NetBSD has no kernel notion of time zone, and only an
1.25 perry 359: * obsolete program would try to set it, so we log a warning.
360: */
1.11 cgd 361: if (SCARG(uap, tzp))
1.25 perry 362: log(LOG_WARNING, "pid %d attempted to set the "
1.32 mycroft 363: "(obsolete) kernel time zone\n", p->p_pid);
1.8 cgd 364: return (0);
1.1 cgd 365: }
366:
367: int tickdelta; /* current clock skew, us. per tick */
368: long timedelta; /* unapplied time correction, us. */
369: long bigadj = 1000000; /* use 10x skew above bigadj us. */
370:
371: /* ARGSUSED */
1.3 andrew 372: int
1.16 mycroft 373: sys_adjtime(p, v, retval)
1.1 cgd 374: struct proc *p;
1.15 thorpej 375: void *v;
376: register_t *retval;
377: {
1.45 augustss 378: struct sys_adjtime_args /* {
1.24 cgd 379: syscallarg(const struct timeval *) delta;
1.11 cgd 380: syscallarg(struct timeval *) olddelta;
1.15 thorpej 381: } */ *uap = v;
1.8 cgd 382: struct timeval atv;
1.45 augustss 383: long ndelta, ntickdelta, odelta;
1.1 cgd 384: int s, error;
385:
1.17 christos 386: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
1.1 cgd 387: return (error);
1.17 christos 388:
1.24 cgd 389: error = copyin(SCARG(uap, delta), &atv, sizeof(struct timeval));
1.17 christos 390: if (error)
1.1 cgd 391: return (error);
1.37 thorpej 392: if (SCARG(uap, olddelta) != NULL &&
393: uvm_useracc((caddr_t)SCARG(uap, olddelta), sizeof(struct timeval),
394: B_WRITE) == FALSE)
395: return (EFAULT);
1.8 cgd 396:
397: /*
398: * Compute the total correction and the rate at which to apply it.
399: * Round the adjustment down to a whole multiple of the per-tick
400: * delta, so that after some number of incremental changes in
401: * hardclock(), tickdelta will become zero, lest the correction
402: * overshoot and start taking us away from the desired final time.
403: */
1.1 cgd 404: ndelta = atv.tv_sec * 1000000 + atv.tv_usec;
1.41 hwr 405: if (ndelta > bigadj || ndelta < -bigadj)
1.8 cgd 406: ntickdelta = 10 * tickadj;
407: else
408: ntickdelta = tickadj;
409: if (ndelta % ntickdelta)
410: ndelta = ndelta / ntickdelta * ntickdelta;
411:
412: /*
413: * To make hardclock()'s job easier, make the per-tick delta negative
414: * if we want time to run slower; then hardclock can simply compute
415: * tick + tickdelta, and subtract tickdelta from timedelta.
416: */
417: if (ndelta < 0)
418: ntickdelta = -ntickdelta;
1.1 cgd 419: s = splclock();
1.8 cgd 420: odelta = timedelta;
1.1 cgd 421: timedelta = ndelta;
1.8 cgd 422: tickdelta = ntickdelta;
1.1 cgd 423: splx(s);
424:
1.11 cgd 425: if (SCARG(uap, olddelta)) {
1.8 cgd 426: atv.tv_sec = odelta / 1000000;
427: atv.tv_usec = odelta % 1000000;
1.24 cgd 428: (void) copyout(&atv, SCARG(uap, olddelta),
1.8 cgd 429: sizeof(struct timeval));
430: }
1.1 cgd 431: return (0);
432: }
433:
434: /*
435: * Get value of an interval timer. The process virtual and
436: * profiling virtual time timers are kept in the p_stats area, since
437: * they can be swapped out. These are kept internally in the
438: * way they are specified externally: in time until they expire.
439: *
440: * The real time interval timer is kept in the process table slot
441: * for the process, and its value (it_value) is kept as an
442: * absolute time rather than as a delta, so that it is easy to keep
443: * periodic real-time signals from drifting.
444: *
445: * Virtual time timers are processed in the hardclock() routine of
446: * kern_clock.c. The real time timer is processed by a timeout
447: * routine, called from the softclock() routine. Since a callout
448: * may be delayed in real time due to interrupt processing in the system,
449: * it is possible for the real time timeout routine (realitexpire, given below),
450: * to be delayed in real time past when it is supposed to occur. It
451: * does not suffice, therefore, to reload the real timer .it_value from the
452: * real time timers .it_interval. Rather, we compute the next time in
453: * absolute time the timer should go off.
454: */
455: /* ARGSUSED */
1.3 andrew 456: int
1.16 mycroft 457: sys_getitimer(p, v, retval)
1.1 cgd 458: struct proc *p;
1.15 thorpej 459: void *v;
460: register_t *retval;
461: {
1.45 augustss 462: struct sys_getitimer_args /* {
1.30 mycroft 463: syscallarg(int) which;
1.11 cgd 464: syscallarg(struct itimerval *) itv;
1.15 thorpej 465: } */ *uap = v;
1.30 mycroft 466: int which = SCARG(uap, which);
1.1 cgd 467: struct itimerval aitv;
468: int s;
469:
1.30 mycroft 470: if ((u_int)which > ITIMER_PROF)
1.1 cgd 471: return (EINVAL);
472: s = splclock();
1.30 mycroft 473: if (which == ITIMER_REAL) {
1.1 cgd 474: /*
1.12 mycroft 475: * Convert from absolute to relative time in .it_value
1.1 cgd 476: * part of real time timer. If time for real time timer
477: * has passed return 0, else return difference between
478: * current time and time for the timer to go off.
479: */
480: aitv = p->p_realtimer;
1.36 thorpej 481: if (timerisset(&aitv.it_value)) {
1.1 cgd 482: if (timercmp(&aitv.it_value, &time, <))
483: timerclear(&aitv.it_value);
484: else
1.14 mycroft 485: timersub(&aitv.it_value, &time, &aitv.it_value);
1.36 thorpej 486: }
1.1 cgd 487: } else
1.30 mycroft 488: aitv = p->p_stats->p_timer[which];
1.1 cgd 489: splx(s);
1.35 perry 490: return (copyout(&aitv, SCARG(uap, itv), sizeof(struct itimerval)));
1.1 cgd 491: }
492:
493: /* ARGSUSED */
1.3 andrew 494: int
1.16 mycroft 495: sys_setitimer(p, v, retval)
1.1 cgd 496: struct proc *p;
1.45 augustss 497: void *v;
1.15 thorpej 498: register_t *retval;
499: {
1.45 augustss 500: struct sys_setitimer_args /* {
1.30 mycroft 501: syscallarg(int) which;
1.24 cgd 502: syscallarg(const struct itimerval *) itv;
1.11 cgd 503: syscallarg(struct itimerval *) oitv;
1.15 thorpej 504: } */ *uap = v;
1.30 mycroft 505: int which = SCARG(uap, which);
1.21 cgd 506: struct sys_getitimer_args getargs;
1.1 cgd 507: struct itimerval aitv;
1.45 augustss 508: const struct itimerval *itvp;
1.1 cgd 509: int s, error;
510:
1.30 mycroft 511: if ((u_int)which > ITIMER_PROF)
1.1 cgd 512: return (EINVAL);
1.11 cgd 513: itvp = SCARG(uap, itv);
1.24 cgd 514: if (itvp && (error = copyin(itvp, &aitv, sizeof(struct itimerval))))
1.1 cgd 515: return (error);
1.21 cgd 516: if (SCARG(uap, oitv) != NULL) {
1.30 mycroft 517: SCARG(&getargs, which) = which;
1.21 cgd 518: SCARG(&getargs, itv) = SCARG(uap, oitv);
1.23 cgd 519: if ((error = sys_getitimer(p, &getargs, retval)) != 0)
1.21 cgd 520: return (error);
521: }
1.1 cgd 522: if (itvp == 0)
523: return (0);
524: if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval))
525: return (EINVAL);
526: s = splclock();
1.30 mycroft 527: if (which == ITIMER_REAL) {
1.44 thorpej 528: callout_stop(&p->p_realit_ch);
1.1 cgd 529: if (timerisset(&aitv.it_value)) {
1.14 mycroft 530: timeradd(&aitv.it_value, &time, &aitv.it_value);
1.44 thorpej 531: callout_reset(&p->p_realit_ch, hzto(&aitv.it_value),
532: realitexpire, p);
1.1 cgd 533: }
534: p->p_realtimer = aitv;
535: } else
1.30 mycroft 536: p->p_stats->p_timer[which] = aitv;
1.1 cgd 537: splx(s);
538: return (0);
539: }
540:
541: /*
542: * Real interval timer expired:
543: * send process whose timer expired an alarm signal.
544: * If time is not set up to reload, then just return.
545: * Else compute next time timer should go off which is > current time.
546: * This is where delay in processing this timeout causes multiple
547: * SIGALRM calls to be compressed into one.
548: */
1.3 andrew 549: void
1.6 cgd 550: realitexpire(arg)
551: void *arg;
552: {
1.45 augustss 553: struct proc *p;
1.1 cgd 554: int s;
555:
1.6 cgd 556: p = (struct proc *)arg;
1.1 cgd 557: psignal(p, SIGALRM);
558: if (!timerisset(&p->p_realtimer.it_interval)) {
559: timerclear(&p->p_realtimer.it_value);
560: return;
561: }
562: for (;;) {
563: s = splclock();
1.14 mycroft 564: timeradd(&p->p_realtimer.it_value,
565: &p->p_realtimer.it_interval, &p->p_realtimer.it_value);
1.1 cgd 566: if (timercmp(&p->p_realtimer.it_value, &time, >)) {
1.44 thorpej 567: callout_reset(&p->p_realit_ch,
568: hzto(&p->p_realtimer.it_value), realitexpire, p);
1.1 cgd 569: splx(s);
570: return;
571: }
572: splx(s);
573: }
574: }
575:
576: /*
577: * Check that a proposed value to load into the .it_value or
578: * .it_interval part of an interval timer is acceptable, and
579: * fix it to have at least minimal value (i.e. if it is less
580: * than the resolution of the clock, round it up.)
581: */
1.3 andrew 582: int
1.1 cgd 583: itimerfix(tv)
584: struct timeval *tv;
585: {
586:
587: if (tv->tv_sec < 0 || tv->tv_sec > 100000000 ||
588: tv->tv_usec < 0 || tv->tv_usec >= 1000000)
589: return (EINVAL);
590: if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick)
591: tv->tv_usec = tick;
592: return (0);
593: }
594:
595: /*
596: * Decrement an interval timer by a specified number
597: * of microseconds, which must be less than a second,
598: * i.e. < 1000000. If the timer expires, then reload
599: * it. In this case, carry over (usec - old value) to
1.8 cgd 600: * reduce the value reloaded into the timer so that
1.1 cgd 601: * the timer does not drift. This routine assumes
602: * that it is called in a context where the timers
603: * on which it is operating cannot change in value.
604: */
1.3 andrew 605: int
1.1 cgd 606: itimerdecr(itp, usec)
1.45 augustss 607: struct itimerval *itp;
1.1 cgd 608: int usec;
609: {
610:
611: if (itp->it_value.tv_usec < usec) {
612: if (itp->it_value.tv_sec == 0) {
613: /* expired, and already in next interval */
614: usec -= itp->it_value.tv_usec;
615: goto expire;
616: }
617: itp->it_value.tv_usec += 1000000;
618: itp->it_value.tv_sec--;
619: }
620: itp->it_value.tv_usec -= usec;
621: usec = 0;
622: if (timerisset(&itp->it_value))
623: return (1);
624: /* expired, exactly at end of interval */
625: expire:
626: if (timerisset(&itp->it_interval)) {
627: itp->it_value = itp->it_interval;
628: itp->it_value.tv_usec -= usec;
629: if (itp->it_value.tv_usec < 0) {
630: itp->it_value.tv_usec += 1000000;
631: itp->it_value.tv_sec--;
632: }
633: } else
634: itp->it_value.tv_usec = 0; /* sec is already 0 */
635: return (0);
1.42 cgd 636: }
637:
638: /*
639: * ratecheck(): simple time-based rate-limit checking. see ratecheck(9)
640: * for usage and rationale.
641: */
642: int
643: ratecheck(lasttime, mininterval)
644: struct timeval *lasttime;
645: const struct timeval *mininterval;
646: {
1.49 itojun 647: struct timeval tv, delta;
1.42 cgd 648: int s, rv = 0;
649:
650: s = splclock();
1.49 itojun 651: tv = mono_time;
652: splx(s);
653:
654: timersub(&tv, lasttime, &delta);
1.42 cgd 655:
656: /*
657: * check for 0,0 is so that the message will be seen at least once,
658: * even if interval is huge.
659: */
660: if (timercmp(&delta, mininterval, >=) ||
661: (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
1.49 itojun 662: *lasttime = tv;
1.42 cgd 663: rv = 1;
664: }
1.50 ! itojun 665:
! 666: return (rv);
! 667: }
! 668:
! 669: /*
! 670: * ppsratecheck(): packets (or events) per second limitation.
! 671: */
! 672: int
! 673: ppsratecheck(lasttime, curpps, maxpps)
! 674: struct timeval *lasttime;
! 675: int *curpps;
! 676: int maxpps; /* maximum pps allowed */
! 677: {
! 678: struct timeval tv, delta;
! 679: int s, rv;
! 680:
! 681: s = splclock();
! 682: tv = mono_time;
! 683: splx(s);
! 684:
! 685: timersub(&tv, lasttime, &delta);
! 686:
! 687: /*
! 688: * check for 0,0 is so that the message will be seen at least once.
! 689: * if more than one second have passed since the last update of
! 690: * lasttime, reset the counter.
! 691: *
! 692: * we do increment *curpps even in *curpps < maxpps case, as some may
! 693: * try to use *curpps for stat purposes as well.
! 694: */
! 695: if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
! 696: delta.tv_sec >= 1) {
! 697: *lasttime = tv;
! 698: *curpps = 0;
! 699: rv = 1;
! 700: } else if (*curpps < maxpps)
! 701: rv = 1;
! 702: else
! 703: rv = 0;
! 704:
! 705: #if 1 /*DIAGNOSTICS?*/
! 706: /* be careful about wrap-around */
! 707: if (*curpps + 1 > *curpps)
! 708: *curpps = *curpps + 1;
! 709: #else
! 710: /*
! 711: * assume that there's not too many calls to this function.
! 712: * not sure if the assumption holds, as it depends on *caller's*
! 713: * behavior, not the behavior of this function.
! 714: * IMHO it is wrong to make assumption on the caller's behavior,
! 715: * so the above #if is #if 1, not #ifdef DIAGNOSTICS.
! 716: */
! 717: *curpps = *curpps + 1;
! 718: #endif
1.42 cgd 719:
720: return (rv);
1.1 cgd 721: }
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