Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
9cb30eb6 KM |
2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. |
3 | * All rights reserved. | |
da7c5cc6 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
9cb30eb6 | 6 | * |
f66fdda5 | 7 | * @(#)kern_time.c 7.16 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
961945a8 | 9 | |
94368568 | 10 | #include "param.h" |
8429d022 | 11 | #include "resourcevar.h" |
94368568 | 12 | #include "kernel.h" |
94368568 | 13 | #include "proc.h" |
f66fdda5 | 14 | #include "vnode.h" |
b6f30e0a | 15 | |
fb1db32c | 16 | |
1edb1cf8 BJ |
17 | /* |
18 | * Time of day and interval timer support. | |
aa261505 BJ |
19 | * |
20 | * These routines provide the kernel entry points to get and set | |
21 | * the time-of-day and per-process interval timers. Subroutines | |
22 | * here provide support for adding and subtracting timeval structures | |
23 | * and decrementing interval timers, optionally reloading the interval | |
24 | * timers when they expire. | |
1edb1cf8 BJ |
25 | */ |
26 | ||
fc4a5eac MK |
27 | /* ARGSUSED */ |
28 | gettimeofday(p, uap, retval) | |
29 | struct proc *p; | |
30 | register struct args { | |
b6f30e0a BJ |
31 | struct timeval *tp; |
32 | struct timezone *tzp; | |
fc4a5eac MK |
33 | } *uap; |
34 | int *retval; | |
35 | { | |
b6f30e0a | 36 | struct timeval atv; |
fc4a5eac | 37 | int error = 0; |
4147b3f6 | 38 | |
2b6a7e0f KB |
39 | if (uap->tp) { |
40 | microtime(&atv); | |
fc4a5eac MK |
41 | if (error = copyout((caddr_t)&atv, (caddr_t)uap->tp, |
42 | sizeof (atv))) | |
d9c2f47f | 43 | return (error); |
2b6a7e0f KB |
44 | } |
45 | if (uap->tzp) | |
fc4a5eac MK |
46 | error = copyout((caddr_t)&tz, (caddr_t)uap->tzp, |
47 | sizeof (tz)); | |
d9c2f47f | 48 | return (error); |
4147b3f6 BJ |
49 | } |
50 | ||
cd23cb29 | 51 | /* ARGSUSED */ |
fc4a5eac MK |
52 | settimeofday(p, uap, retval) |
53 | struct proc *p; | |
54 | struct args { | |
1edb1cf8 BJ |
55 | struct timeval *tv; |
56 | struct timezone *tzp; | |
fc4a5eac MK |
57 | } *uap; |
58 | int *retval; | |
59 | { | |
b6f30e0a BJ |
60 | struct timeval atv; |
61 | struct timezone atz; | |
fc4a5eac | 62 | int error, s; |
4147b3f6 | 63 | |
8429d022 | 64 | if (error = suser(p->p_ucred, &p->p_acflag)) |
d9c2f47f | 65 | return (error); |
2b6a7e0f | 66 | if (uap->tv) { |
fc4a5eac MK |
67 | if (error = copyin((caddr_t)uap->tv, (caddr_t)&atv, |
68 | sizeof (struct timeval))) | |
d9c2f47f | 69 | return (error); |
9cb30eb6 KM |
70 | /* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */ |
71 | boottime.tv_sec += atv.tv_sec - time.tv_sec; | |
f66fdda5 | 72 | LEASE_UPDATETIME(atv.tv_sec - time.tv_sec); |
9cb30eb6 KM |
73 | s = splhigh(); time = atv; splx(s); |
74 | resettodr(); | |
2b6a7e0f | 75 | } |
fc4a5eac MK |
76 | if (uap->tzp && (error = copyin((caddr_t)uap->tzp, (caddr_t)&atz, |
77 | sizeof (atz))) == 0) | |
849cbd39 | 78 | tz = atz; |
d9c2f47f | 79 | return (error); |
4147b3f6 BJ |
80 | } |
81 | ||
4ca0d0d6 MK |
82 | extern int tickadj; /* "standard" clock skew, us./tick */ |
83 | int tickdelta; /* current clock skew, us. per tick */ | |
84 | long timedelta; /* unapplied time correction, us. */ | |
85 | long bigadj = 1000000; /* use 10x skew above bigadj us. */ | |
99e47f6b | 86 | |
fc4a5eac MK |
87 | /* ARGSUSED */ |
88 | adjtime(p, uap, retval) | |
89 | struct proc *p; | |
90 | register struct args { | |
99e47f6b MK |
91 | struct timeval *delta; |
92 | struct timeval *olddelta; | |
fc4a5eac MK |
93 | } *uap; |
94 | int *retval; | |
95 | { | |
99e47f6b | 96 | struct timeval atv, oatv; |
4ca0d0d6 | 97 | register long ndelta; |
fc4a5eac | 98 | int s, error; |
99e47f6b | 99 | |
8429d022 | 100 | if (error = suser(p->p_ucred, &p->p_acflag)) |
d9c2f47f | 101 | return (error); |
fc4a5eac MK |
102 | if (error = |
103 | copyin((caddr_t)uap->delta, (caddr_t)&atv, sizeof (struct timeval))) | |
d9c2f47f | 104 | return (error); |
4ca0d0d6 MK |
105 | ndelta = atv.tv_sec * 1000000 + atv.tv_usec; |
106 | if (timedelta == 0) | |
107 | if (ndelta > bigadj) | |
108 | tickdelta = 10 * tickadj; | |
109 | else | |
110 | tickdelta = tickadj; | |
111 | if (ndelta % tickdelta) | |
112 | ndelta = ndelta / tickadj * tickadj; | |
113 | ||
8efc019f | 114 | s = splclock(); |
99e47f6b | 115 | if (uap->olddelta) { |
4ca0d0d6 MK |
116 | oatv.tv_sec = timedelta / 1000000; |
117 | oatv.tv_usec = timedelta % 1000000; | |
99e47f6b | 118 | } |
4ca0d0d6 | 119 | timedelta = ndelta; |
8efc019f | 120 | splx(s); |
4ca0d0d6 MK |
121 | |
122 | if (uap->olddelta) | |
123 | (void) copyout((caddr_t)&oatv, (caddr_t)uap->olddelta, | |
124 | sizeof (struct timeval)); | |
d9c2f47f | 125 | return (0); |
99e47f6b MK |
126 | } |
127 | ||
aa261505 BJ |
128 | /* |
129 | * Get value of an interval timer. The process virtual and | |
8429d022 | 130 | * profiling virtual time timers are kept in the p_stats area, since |
aa261505 BJ |
131 | * they can be swapped out. These are kept internally in the |
132 | * way they are specified externally: in time until they expire. | |
133 | * | |
134 | * The real time interval timer is kept in the process table slot | |
135 | * for the process, and its value (it_value) is kept as an | |
136 | * absolute time rather than as a delta, so that it is easy to keep | |
137 | * periodic real-time signals from drifting. | |
138 | * | |
139 | * Virtual time timers are processed in the hardclock() routine of | |
140 | * kern_clock.c. The real time timer is processed by a timeout | |
141 | * routine, called from the softclock() routine. Since a callout | |
142 | * may be delayed in real time due to interrupt processing in the system, | |
143 | * it is possible for the real time timeout routine (realitexpire, given below), | |
144 | * to be delayed in real time past when it is supposed to occur. It | |
145 | * does not suffice, therefore, to reload the real timer .it_value from the | |
146 | * real time timers .it_interval. Rather, we compute the next time in | |
147 | * absolute time the timer should go off. | |
148 | */ | |
fc4a5eac MK |
149 | /* ARGSUSED */ |
150 | getitimer(p, uap, retval) | |
151 | struct proc *p; | |
152 | register struct args { | |
b6f30e0a BJ |
153 | u_int which; |
154 | struct itimerval *itv; | |
fc4a5eac MK |
155 | } *uap; |
156 | int *retval; | |
157 | { | |
d01b68d6 | 158 | struct itimerval aitv; |
b6f30e0a | 159 | int s; |
aac7ea5b | 160 | |
fc4a5eac | 161 | if (uap->which > ITIMER_PROF) |
d9c2f47f | 162 | return (EINVAL); |
fa5e5ab4 | 163 | s = splclock(); |
d01b68d6 | 164 | if (uap->which == ITIMER_REAL) { |
aa261505 BJ |
165 | /* |
166 | * Convert from absoulte to relative time in .it_value | |
167 | * part of real time timer. If time for real time timer | |
168 | * has passed return 0, else return difference between | |
169 | * current time and time for the timer to go off. | |
170 | */ | |
fc4a5eac | 171 | aitv = p->p_realtimer; |
d01b68d6 BJ |
172 | if (timerisset(&aitv.it_value)) |
173 | if (timercmp(&aitv.it_value, &time, <)) | |
174 | timerclear(&aitv.it_value); | |
175 | else | |
176 | timevalsub(&aitv.it_value, &time); | |
177 | } else | |
8429d022 | 178 | aitv = p->p_stats->p_timer[uap->which]; |
d01b68d6 | 179 | splx(s); |
d9c2f47f | 180 | return (copyout((caddr_t)&aitv, (caddr_t)uap->itv, |
fc4a5eac | 181 | sizeof (struct itimerval))); |
aac7ea5b BJ |
182 | } |
183 | ||
fc4a5eac MK |
184 | /* ARGSUSED */ |
185 | setitimer(p, uap, retval) | |
186 | struct proc *p; | |
187 | register struct args { | |
b6f30e0a | 188 | u_int which; |
1edb1cf8 | 189 | struct itimerval *itv, *oitv; |
fc4a5eac MK |
190 | } *uap; |
191 | int *retval; | |
192 | { | |
c4bbb24f KB |
193 | struct itimerval aitv; |
194 | register struct itimerval *itvp; | |
fc4a5eac | 195 | int s, error; |
aac7ea5b | 196 | |
fc4a5eac | 197 | if (uap->which > ITIMER_PROF) |
d9c2f47f | 198 | return (EINVAL); |
c4bbb24f | 199 | itvp = uap->itv; |
fc4a5eac | 200 | if (itvp && (error = copyin((caddr_t)itvp, (caddr_t)&aitv, |
c4bbb24f | 201 | sizeof(struct itimerval)))) |
d9c2f47f | 202 | return (error); |
fc4a5eac | 203 | if ((uap->itv = uap->oitv) && (error = getitimer(p, uap, retval))) |
d9c2f47f | 204 | return (error); |
c4bbb24f | 205 | if (itvp == 0) |
fc4a5eac MK |
206 | return (0); |
207 | if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval)) | |
d9c2f47f | 208 | return (EINVAL); |
fa5e5ab4 | 209 | s = splclock(); |
d01b68d6 | 210 | if (uap->which == ITIMER_REAL) { |
b32450f4 | 211 | untimeout(realitexpire, (caddr_t)p); |
d01b68d6 BJ |
212 | if (timerisset(&aitv.it_value)) { |
213 | timevaladd(&aitv.it_value, &time); | |
b32450f4 | 214 | timeout(realitexpire, (caddr_t)p, hzto(&aitv.it_value)); |
d01b68d6 BJ |
215 | } |
216 | p->p_realtimer = aitv; | |
217 | } else | |
8429d022 | 218 | p->p_stats->p_timer[uap->which] = aitv; |
b6f30e0a | 219 | splx(s); |
d9c2f47f | 220 | return (0); |
b6f30e0a BJ |
221 | } |
222 | ||
aa261505 BJ |
223 | /* |
224 | * Real interval timer expired: | |
225 | * send process whose timer expired an alarm signal. | |
226 | * If time is not set up to reload, then just return. | |
227 | * Else compute next time timer should go off which is > current time. | |
228 | * This is where delay in processing this timeout causes multiple | |
229 | * SIGALRM calls to be compressed into one. | |
230 | */ | |
231 | realitexpire(p) | |
d01b68d6 BJ |
232 | register struct proc *p; |
233 | { | |
234 | int s; | |
235 | ||
236 | psignal(p, SIGALRM); | |
237 | if (!timerisset(&p->p_realtimer.it_interval)) { | |
238 | timerclear(&p->p_realtimer.it_value); | |
239 | return; | |
240 | } | |
241 | for (;;) { | |
fa5e5ab4 | 242 | s = splclock(); |
d01b68d6 BJ |
243 | timevaladd(&p->p_realtimer.it_value, |
244 | &p->p_realtimer.it_interval); | |
245 | if (timercmp(&p->p_realtimer.it_value, &time, >)) { | |
b32450f4 BJ |
246 | timeout(realitexpire, (caddr_t)p, |
247 | hzto(&p->p_realtimer.it_value)); | |
d01b68d6 BJ |
248 | splx(s); |
249 | return; | |
250 | } | |
251 | splx(s); | |
252 | } | |
253 | } | |
254 | ||
aa261505 BJ |
255 | /* |
256 | * Check that a proposed value to load into the .it_value or | |
257 | * .it_interval part of an interval timer is acceptable, and | |
258 | * fix it to have at least minimal value (i.e. if it is less | |
259 | * than the resolution of the clock, round it up.) | |
260 | */ | |
1edb1cf8 BJ |
261 | itimerfix(tv) |
262 | struct timeval *tv; | |
b6f30e0a | 263 | { |
b6f30e0a | 264 | |
d01b68d6 BJ |
265 | if (tv->tv_sec < 0 || tv->tv_sec > 100000000 || |
266 | tv->tv_usec < 0 || tv->tv_usec >= 1000000) | |
1edb1cf8 | 267 | return (EINVAL); |
c45fcba6 | 268 | if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick) |
1edb1cf8 BJ |
269 | tv->tv_usec = tick; |
270 | return (0); | |
b6f30e0a BJ |
271 | } |
272 | ||
aa261505 BJ |
273 | /* |
274 | * Decrement an interval timer by a specified number | |
275 | * of microseconds, which must be less than a second, | |
276 | * i.e. < 1000000. If the timer expires, then reload | |
277 | * it. In this case, carry over (usec - old value) to | |
278 | * reducint the value reloaded into the timer so that | |
279 | * the timer does not drift. This routine assumes | |
280 | * that it is called in a context where the timers | |
281 | * on which it is operating cannot change in value. | |
282 | */ | |
b6f30e0a BJ |
283 | itimerdecr(itp, usec) |
284 | register struct itimerval *itp; | |
285 | int usec; | |
286 | { | |
287 | ||
1edb1cf8 BJ |
288 | if (itp->it_value.tv_usec < usec) { |
289 | if (itp->it_value.tv_sec == 0) { | |
aa261505 | 290 | /* expired, and already in next interval */ |
1edb1cf8 | 291 | usec -= itp->it_value.tv_usec; |
b6f30e0a | 292 | goto expire; |
1edb1cf8 BJ |
293 | } |
294 | itp->it_value.tv_usec += 1000000; | |
295 | itp->it_value.tv_sec--; | |
aac7ea5b | 296 | } |
1edb1cf8 BJ |
297 | itp->it_value.tv_usec -= usec; |
298 | usec = 0; | |
299 | if (timerisset(&itp->it_value)) | |
b6f30e0a | 300 | return (1); |
aa261505 | 301 | /* expired, exactly at end of interval */ |
b6f30e0a | 302 | expire: |
1edb1cf8 BJ |
303 | if (timerisset(&itp->it_interval)) { |
304 | itp->it_value = itp->it_interval; | |
305 | itp->it_value.tv_usec -= usec; | |
306 | if (itp->it_value.tv_usec < 0) { | |
307 | itp->it_value.tv_usec += 1000000; | |
308 | itp->it_value.tv_sec--; | |
309 | } | |
310 | } else | |
aa261505 | 311 | itp->it_value.tv_usec = 0; /* sec is already 0 */ |
b6f30e0a | 312 | return (0); |
aac7ea5b BJ |
313 | } |
314 | ||
aa261505 BJ |
315 | /* |
316 | * Add and subtract routines for timevals. | |
317 | * N.B.: subtract routine doesn't deal with | |
318 | * results which are before the beginning, | |
319 | * it just gets very confused in this case. | |
320 | * Caveat emptor. | |
321 | */ | |
322 | timevaladd(t1, t2) | |
323 | struct timeval *t1, *t2; | |
324 | { | |
325 | ||
326 | t1->tv_sec += t2->tv_sec; | |
327 | t1->tv_usec += t2->tv_usec; | |
328 | timevalfix(t1); | |
329 | } | |
330 | ||
331 | timevalsub(t1, t2) | |
332 | struct timeval *t1, *t2; | |
333 | { | |
334 | ||
335 | t1->tv_sec -= t2->tv_sec; | |
336 | t1->tv_usec -= t2->tv_usec; | |
337 | timevalfix(t1); | |
338 | } | |
339 | ||
340 | timevalfix(t1) | |
341 | struct timeval *t1; | |
342 | { | |
343 | ||
344 | if (t1->tv_usec < 0) { | |
345 | t1->tv_sec--; | |
346 | t1->tv_usec += 1000000; | |
347 | } | |
348 | if (t1->tv_usec >= 1000000) { | |
349 | t1->tv_sec++; | |
350 | t1->tv_usec -= 1000000; | |
351 | } | |
352 | } |