1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
|
/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Driver file for Solaris operating system
*/
#include "config.h"
#ifdef SOLARIS
#include <kvm.h>
#include <fcntl.h>
#include <nlist.h>
#include <assert.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include <stdio.h>
#include "sys_solaris.h"
#include "localp.h"
#include "sched.h"
#include "logging.h"
#include "util.h"
/* ================================================== */
/* This register contains the number of seconds by which the local
clock was estimated to be fast of reference time at the epoch when
gettimeofday() returned T0 */
static double offset_register;
/* This register contains the epoch to which the offset is referenced */
static struct timeval T0;
/* This register contains the current estimate of the system
frequency, in absolute (NOT ppm) */
static double current_freq;
/* This register contains the number of seconds of adjustment that
were passed to adjtime last time it was called. */
static double adjustment_requested;
/* ================================================== */
/* On Solaris 2.5 & 2.5.1, passing an argument of zero as the new
delta to adjtime does not zero out the adjustment - the remaining
adjustment is returned as the old delta arg, but the adjustment keeps
running. To get round this, we set adjustments of +/-1us when we
really want zero. Alternate adjustments are used to avoid a drift
from building up. */
static struct timeval zeroes[2] = {
{0, 1},
{-1, 999999}
};
static int index=0;
/* If 1, need to run dosynctodr(). If 0, don't */
static int need_dosynctodr = -1;
#define GET_ZERO (zeroes[index^=1])
/* ================================================== */
static void
clock_initialise(void)
{
struct timeval newadj, oldadj;
offset_register = 0.0;
adjustment_requested = 0.0;
current_freq = 0.0;
if (gettimeofday(&T0, NULL) < 0) {
LOG_FATAL(LOGF_SysSolaris, "gettimeofday() failed");
}
newadj = GET_ZERO;
if (adjtime(&newadj, &oldadj) < 0) {
LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
}
if (adjtime(&newadj, &oldadj) < 0) {
LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
}
}
/* ================================================== */
static void
clock_finalise(void)
{
/* Nothing to do yet */
}
/* ================================================== */
static void
start_adjust(void)
{
struct timeval newadj, oldadj;
struct timeval T1;
double elapsed, accrued_error;
double adjust_required;
struct timeval exact_newadj;
double rounding_error;
double old_adjust_remaining;
/* Determine the amount of error built up since the last adjustment */
if (gettimeofday(&T1, NULL) < 0) {
LOG_FATAL(LOGF_SysSolaris, "gettimeofday() failed");
}
UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
accrued_error = elapsed * current_freq;
adjust_required = - (accrued_error + offset_register);
UTI_DoubleToTimeval(adjust_required, &exact_newadj);
/* At this point, we will need to call the adjustment rounding
algorithm in the system-specific layer. For now, just assume the
adjustment can be applied exactly. */
newadj = exact_newadj;
/* Want to *add* rounding error back onto offset register */
UTI_DiffTimevalsToDouble(&rounding_error, &exact_newadj, &newadj);
if (adjtime(&newadj, &oldadj) < 0) {
LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
}
UTI_TimevalToDouble(&oldadj, &old_adjust_remaining);
offset_register = rounding_error - old_adjust_remaining;
T0 = T1;
UTI_TimevalToDouble(&newadj, &adjustment_requested);
}
/* ================================================== */
static void
stop_adjust(void)
{
struct timeval T1;
struct timeval zeroadj, remadj;
double adjustment_remaining, adjustment_achieved;
double elapsed, elapsed_plus_adjust;
zeroadj = GET_ZERO;
if (adjtime(&zeroadj, &remadj) < 0) {
LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
}
if (gettimeofday(&T1, NULL) < 0) {
LOG_FATAL(LOGF_SysSolaris, "gettimeofday() failed");
}
UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
UTI_TimevalToDouble(&remadj, &adjustment_remaining);
adjustment_achieved = adjustment_requested - adjustment_remaining;
elapsed_plus_adjust = elapsed - adjustment_achieved;
offset_register += current_freq * elapsed_plus_adjust - adjustment_remaining;
adjustment_requested = 0.0;
T0 = T1;
}
/* ================================================== */
/* Positive offset means system clock is fast of true time, therefore
slew backwards */
static void
accrue_offset(double offset, double corr_rate)
{
stop_adjust();
offset_register += offset;
start_adjust();
}
/* ================================================== */
/* Positive offset means system clock is fast of true time, therefore
step backwards */
static void
apply_step_offset(double offset)
{
struct timeval old_time, new_time, rounded_new_time, T1;
double rounding_error;
stop_adjust();
if (gettimeofday(&old_time, NULL) < 0) {
LOG_FATAL(LOGF_SysSolaris, "gettimeofday() failed");
}
UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
/* The settimeofday function (on Solaris 2.5/Sparc20 at least) does
not work quite as we would want. The time we want to set is
rounded to the nearest second and that time is used. Also, the
clock appears to start from that second boundary plus about 4ms.
For now we'll tolerate this small error. */
rounded_new_time.tv_usec = 0;
if (new_time.tv_usec >= 500000) {
rounded_new_time.tv_sec = new_time.tv_sec + 1;
} else {
rounded_new_time.tv_sec = new_time.tv_sec;
}
UTI_DiffTimevalsToDouble(&rounding_error, &rounded_new_time, &new_time);
if (settimeofday(&new_time, NULL) < 0) {
LOG_FATAL(LOGF_SysSolaris, "settimeofday() failed");
}
UTI_AddDoubleToTimeval(&T0, offset, &T1);
T0 = T1;
offset_register += rounding_error;
start_adjust();
}
/* ================================================== */
static double
set_frequency(double new_freq_ppm)
{
stop_adjust();
current_freq = new_freq_ppm * 1.0e-6;
start_adjust();
return current_freq * 1.0e6;
}
/* ================================================== */
static double
read_frequency(void)
{
return current_freq * 1.0e6;
}
/* ================================================== */
static void
get_offset_correction(struct timeval *raw,
double *corr, double *err)
{
stop_adjust();
*corr = -offset_register;
start_adjust();
if (err)
*err = 0.0;
}
/* ================================================== */
static void
immediate_step(void)
{
}
/* ================================================== */
/* Interval in seconds between adjustments to cancel systematic drift */
#define DRIFT_REMOVAL_INTERVAL (4.0)
static int drift_removal_running = 0;
static SCH_TimeoutID drift_removal_id;
/* ================================================== */
/* This is the timer callback routine which is called periodically to
invoke a time adjustment to take out the machine's drift.
Otherwise, times reported through this software (e.g. by running
ntpdate from another machine) show the machine being correct (since
they correct for drift build-up), but any program on this machine
that reads the system time will be given an erroneous value, the
degree of error depending on how long it is since
get_offset_correction was last called. */
static void
drift_removal_timeout(SCH_ArbitraryArgument not_used)
{
stop_adjust();
start_adjust();
drift_removal_id = SCH_AddTimeoutByDelay(DRIFT_REMOVAL_INTERVAL, drift_removal_timeout, NULL);
}
/* ================================================== */
static void
check_need_dosynctodr(void)
{
struct utsname name;
int result;
int major, minor, veryminor, n_fields;
result = uname(&name);
if (result < 0) {
LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot use uname to detect Solaris version");
need_dosynctodr = 0; /* Assume recent Solaris where it isn't needed */
return;
}
n_fields = sscanf(name.release, "%d.%d.%d\n", &major, &minor, &veryminor);
if (n_fields < 2) {
LOG(LOGS_ERR, LOGF_SysSolaris, "Solaris version doesn't appear to be of the form X.Y[.Z]");
need_dosynctodr = 0; /* Assume recent Solaris where it isn't needed */
return;
}
if (major != 5) {
LOG(LOGS_ERR, LOGF_SysSolaris, "Solaris major version doesn't appear to be 5");
need_dosynctodr = 0; /* Assume recent Solaris where it isn't needed */
return;
}
/* The 'rule of thumb' is that from Solaris 2.6 onwards, dosynctodr() doesn't
* need to be called, and in fact it is counter-productive to do so. For
* earlier versions, it is required. */
if (minor < 6) {
need_dosynctodr = 1;
} else {
need_dosynctodr = 0;
}
}
/* ================================================== */
static void
set_dosynctodr(unsigned long on_off)
{
static struct nlist nl[] = {
{"dosynctodr"},
{NULL}
};
kvm_t *kt;
unsigned long read_back;
assert(on_off == 1 || on_off == 0);
kt = kvm_open(NULL, NULL, NULL, O_RDWR, NULL);
if (!kt) {
LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot open kvm to change dosynctodr");
return;
}
if (kvm_nlist(kt, nl) < 0) {
LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot read dosynctodr in nlist");
kvm_close(kt);
return;
}
if (kvm_write(kt, nl[0].n_value, (char *)(&on_off), sizeof(unsigned long)) < 0) {
LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot write to dosynctodr");
kvm_close(kt);
return;
}
if (kvm_read(kt, nl[0].n_value, (char *)(&read_back), sizeof(unsigned long)) < 0) {
LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot read from dosynctodr");
kvm_close(kt);
return;
}
kvm_close(kt);
assert(read_back == on_off);
}
/* ================================================== */
void
SYS_Solaris_Initialise(void)
{
check_need_dosynctodr();
/* Need to do KVM stuff to turn off dosynctodr. */
clock_initialise();
lcl_RegisterSystemDrivers(read_frequency, set_frequency,
accrue_offset, apply_step_offset,
get_offset_correction,
NULL /* set_leap */);
/* Turn off the kernel switch that keeps the system clock in step
with the non-volatile clock */
if (need_dosynctodr) {
set_dosynctodr(0);
}
drift_removal_id = SCH_AddTimeoutByDelay(DRIFT_REMOVAL_INTERVAL, drift_removal_timeout, NULL);
drift_removal_running = 1;
}
/* ================================================== */
void
SYS_Solaris_Finalise(void)
{
if (drift_removal_running) {
SCH_RemoveTimeout(drift_removal_id);
}
clock_finalise();
/* When exiting, we want to return the machine to its 'autonomous'
tracking mode */
if (need_dosynctodr) {
set_dosynctodr(1);
}
}
/* ================================================== */
#endif /* SOLARIS */
|