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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2011, 2014
*
* 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.
*
**********************************************************************
=======================================================================
Routines implementing temperature compensation.
*/
#include "config.h"
#include "conf.h"
#include "local.h"
#include "memory.h"
#include "util.h"
#include "logging.h"
#include "sched.h"
#include "tempcomp.h"
/* Sanity limit (in ppm) */
#define MAX_COMP 10.0
static SCH_TimeoutID timeout_id;
static LOG_FileID logfileid;
static char *filename;
static double update_interval;
static double T0, k0, k1, k2;
static void
read_timeout(void *arg)
{
FILE *f;
double temp, comp;
f = fopen(filename, "r");
if (f && fscanf(f, "%lf", &temp) == 1) {
comp = k0 + (temp - T0) * k1 + (temp - T0) * (temp - T0) * k2;
if (fabs(comp) <= MAX_COMP) {
comp = LCL_SetTempComp(comp);
if (logfileid != -1) {
struct timeval now;
LCL_ReadCookedTime(&now, NULL);
LOG_FileWrite(logfileid, "%s %11.4e %11.4e",
UTI_TimeToLogForm(now.tv_sec), temp, comp);
}
} else {
LOG(LOGS_WARN, LOGF_TempComp,
"Temperature compensation of %.3f ppm exceeds sanity limit of %.1f",
comp, MAX_COMP);
}
} else {
LOG(LOGS_WARN, LOGF_TempComp, "Could not read temperature from %s",
filename);
}
if (f)
fclose(f);
timeout_id = SCH_AddTimeoutByDelay(update_interval, read_timeout, NULL);
}
void
TMC_Initialise(void)
{
CNF_GetTempComp(&filename, &update_interval, &T0, &k0, &k1, &k2);
if (filename == NULL)
return;
if (update_interval <= 0.0)
update_interval = 1.0;
logfileid = CNF_GetLogTempComp() ? LOG_FileOpen("tempcomp",
" Date (UTC) Time Temp. Comp.")
: -1;
read_timeout(NULL);
}
void
TMC_Finalise(void)
{
if (filename == NULL)
return;
SCH_RemoveTimeout(timeout_id);
Free(filename);
}
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