b9b338a8df
Update the reachability register of a refclock source by 1 if a valid measurement is received by the drivers between source polls, and not only when it is accumulated to sourcestats, similarly to how reachability works with NTP sources. This avoids drops in the reported reachability when a PHC refclock is dropping samples due to significant changes in the measured delay (e.g. due to high PCIe load), or a PPS refclock dropping samples due to failed lock.
136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Miroslav Lichvar 2009
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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SHM refclock driver.
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*/
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#include "config.h"
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#include "sysincl.h"
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#include "refclock.h"
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#include "logging.h"
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#include "util.h"
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#define SHMKEY 0x4e545030
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struct shmTime {
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int mode; /* 0 - if valid set
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* use values,
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* clear valid
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* 1 - if valid set
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* if count before and after read of values is equal,
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* use values
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* clear valid
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*/
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volatile int count;
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time_t clockTimeStampSec;
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int clockTimeStampUSec;
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time_t receiveTimeStampSec;
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int receiveTimeStampUSec;
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int leap;
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int precision;
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int nsamples;
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volatile int valid;
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int clockTimeStampNSec;
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int receiveTimeStampNSec;
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int dummy[8];
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};
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static int shm_initialise(RCL_Instance instance) {
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const char *options[] = {"perm", NULL};
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int id, param, perm;
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char *s;
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struct shmTime *shm;
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RCL_CheckDriverOptions(instance, options);
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param = atoi(RCL_GetDriverParameter(instance));
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s = RCL_GetDriverOption(instance, "perm");
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perm = s ? strtol(s, NULL, 8) & 0777 : 0600;
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id = shmget(SHMKEY + param, sizeof (struct shmTime), IPC_CREAT | perm);
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if (id == -1) {
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LOG_FATAL("shmget() failed : %s", strerror(errno));
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return 0;
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}
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shm = (struct shmTime *)shmat(id, 0, 0);
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if ((long)shm == -1) {
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LOG_FATAL("shmat() failed : %s", strerror(errno));
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return 0;
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}
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RCL_SetDriverData(instance, shm);
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return 1;
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}
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static void shm_finalise(RCL_Instance instance)
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{
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shmdt(RCL_GetDriverData(instance));
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}
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static int shm_poll(RCL_Instance instance)
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{
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struct timespec receive_ts, clock_ts;
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struct shmTime t, *shm;
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shm = (struct shmTime *)RCL_GetDriverData(instance);
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t = *shm;
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if ((t.mode == 1 && t.count != shm->count) ||
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!(t.mode == 0 || t.mode == 1) || !t.valid) {
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DEBUG_LOG("SHM sample ignored mode=%d count=%d valid=%d",
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t.mode, t.count, t.valid);
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return 0;
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}
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shm->valid = 0;
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RCL_UpdateReachability(instance);
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receive_ts.tv_sec = t.receiveTimeStampSec;
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clock_ts.tv_sec = t.clockTimeStampSec;
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if (t.clockTimeStampNSec / 1000 == t.clockTimeStampUSec &&
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t.receiveTimeStampNSec / 1000 == t.receiveTimeStampUSec) {
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receive_ts.tv_nsec = t.receiveTimeStampNSec;
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clock_ts.tv_nsec = t.clockTimeStampNSec;
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} else {
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receive_ts.tv_nsec = 1000 * t.receiveTimeStampUSec;
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clock_ts.tv_nsec = 1000 * t.clockTimeStampUSec;
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}
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UTI_NormaliseTimespec(&clock_ts);
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UTI_NormaliseTimespec(&receive_ts);
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return RCL_AddSample(instance, &receive_ts, &clock_ts, t.leap);
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}
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RefclockDriver RCL_SHM_driver = {
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shm_initialise,
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shm_finalise,
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shm_poll
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};
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