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#!/usr/bin/env awk -f
function log10(n) {
return log(n)/log(10.0)
}
function merge_meas(est_val, est_unc, meas_val, meas_unc) {
# Kalman filtering compares variances,
# convert uncertainties to square units
est_unc = (0.5*est_unc)^2.0
meas_unc = (0.5*meas_unc)^2.0
K = (est_unc)/((est_unc) + (meas_unc))
est_val = est_val + K*(meas_val - est_val)
est_unc = (est_unc*meas_unc)/(est_unc + meas_unc)
# convert uncertainties back to original units
est_unc = 2.0*sqrt(est_unc)
meas_unc = 2.0*sqrt(meas_unc)
return sprintf(OFMT OFS OFMT ORS, est_val, est_unc)
}
function sigfig(val, unc) {
ordmag_val = log10(val)
ordmag_unc = log10(unc)
ordmag_high = sqrt((ordmag_val)^2.0 + (ordmag_unc)^2.0)
ordmag_low = ((ordmag_val)^-1.0 + (ordmag_unc)^-1.0)^-1.0
ordmag_range = ordmag_high - ordmag_low
sigfig_unc = sprintf("%.f", ordmag_range)
sigfig_val = sprintf("%.f", sigfig_unc + 6.0)
ofmt_val = "%." sigfig_val "g"
ofmt_unc = "%." sigfig_unc "g"
return sprintf(ofmt_val OFS ofmt_unc, val, unc)
}
function ck_boottime(unm) {
if (unm ~/OpenBSD/) {
"sysctl kern.boottime" | getline t0_k
close("sysctl kern.boottime")
sub("^.*=", "", t0_k)
split(t0_k, t0_k_arr)
t0_k_arr[2] = (index("JanFebMarAprMayJunJulAugSepOctNovDec", t0_k_arr[2]) + 2)/3.0
gsub(":", " ", t0_k_arr[4])
t0_k = sprintf("%04d %02d %02d %s", t0_k_arr[5], t0_k_arr[2], t0_k_arr[3], t0_k_arr[4])
t0_k = mktime(t0_k)
}
if (unm ~/FreeBSD/) {
"sysctl kern.boottime" | getline t0_k
close("sysctl kern.boottime")
sub("^.*{", "", t0_k)
sub("}.*$", "", t0_k)
split(t0_k, t0_k_arr, ",")
for (n in t0_k_arr) {
sub("^.*= ", "", t0_k_arr[n])
}
t0_k = t0_k_arr[1] "." t0_k_arr[2]
}
t0_k_unc = systime()
return sprintf("%s %s", t0_k, t0_k_unc)
}
function ck_time(unm) {
if (unm ~/FreeBSD/) {
#t = systime()
"date +%s.%N" | getline t
close("date +%s.%N")
}
else {
t = systime()
}
return t
}
function ck_uptime() {
# check uptime cmd
"uptime" | getline t_up_cmd
close("uptime")
# evaluate measured uptime
t_up_meas[1] = 0.0
t_up_meas[2] = systime()
sub("^.*up ", "", t_up_cmd)
sub(", load.*$", "", t_up_cmd)
split(t_up_cmd, t_up_cmd_arr, ",")
for (i in t_up_cmd_arr) {
# TODO: add cases for days, months, years, etc.
if (t_up_cmd_arr[i] ~ /day/) {
split(t_up_cmd_arr[i], days)
t_up_meas[1] += 86400.0*(days[1] + 0.0)
(t_up_meas[2] > 86400.0) ? t_up_meas[2] = 86400.0 : t_up_meas[2] += 0.0
}
if (t_up_cmd_arr[i] ~ /hr/) {
split(t_up_cmd_arr[i], hrs)
t_up_meas[1] += 3600.0*(hrs[1] + 0.0)
(t_up_meas[2] > 3600.0) ? t_up_meas[2] = 3600.0 : t_up_meas[2] += 0.0
}
if (t_up_cmd_arr[i] ~ /min/) {
split(t_up_cmd_arr[i], mins)
t_up_meas[1] += (60.0*(mins[1] + 0.0))
(t_up_meas[2] > 60.0) ? t_up_meas[2] = 60.0 : t_up_meas[2] += 0.0
}
if (t_up_cmd_arr[i] ~ /:/) {
split(t_up_cmd_arr[i], hrs_min, ":")
t_up_meas[1] += 3600.0*(hrs_min[1] + 0.0)
(t_up_meas[2] > 3600.0) ? t_up_meas[2] = 3600.0 : t_up_meas[2] += 0.0
t_up_meas[1] += 60.0*(hrs_min[2] + 0.0)
(t_up_meas[2] > 60.0) ? t_up_meas[2] = 60.0 : t_up_meas[2] += 0.0
}
}
return sigfig(t_up_meas[1], t_up_meas[2])
}
BEGIN {
OFMT="%f"
pi = 4.0*atan2(1.0, 1.0)
c0 = 299792458 # m/sec
"uname" | getline uname
close("uname")
#print("_systime_", systime())
#print("_boottime_", ck_boottime())
# check ARGV for previous estimates
#print("ARGC:", ARGC)
if (ARGC) {
ARGV[1] ? t_prev[1] = ARGV[1] : t_prev[1] = 0.0
ARGV[2] ? t_prev[2] = ARGV[2] : t_prev[2] = systime()
ARGV[3] ? t_up_prev[1] = ARGV[3] : t_up_prev[1] = 0.0
ARGV[4] ? t_up_prev[2] = ARGV[4] : t_up_prev[2] = systime()
ARGV[5] ? t0_prev[1] = ARGV[5] : split(ck_boottime(uname), t0_prev)
ARGV[6] ? t0_prev[2] = ARGV[6] : split(ck_boottime(uname), t0_prev)
}
#print( t_prev[1], t_prev[2], t_up_prev[1], t_up_prev[2], t0_prev[1], t0_prev[2] )
# check systime, check uptime, check systime again
t_meas[1] = ck_time(uname)
split(ck_uptime(), t_up_meas)
t_meas[2] = ck_time(uname)
# convert to [val, unc] vector
if ( t_meas[1] != t_meas[2] ) {
t_meas[2] -= t_meas[1]
t_meas[1] += 0.5*t_meas[2]
} else {
t_meas[2] = 1.0
}
t_meas_str = sigfig(t_meas[1], t_meas[2])
# estimate dt
dt[1] = t_meas[1] - t_prev[1]
dt[2] = t_meas[2] + t_prev[2]
# predict uptime based on dt, t_up(new) = t_up(old) + dt
t_up_est[1] = t_up_prev[1] + dt[1]
t_up_est[2] = t_up_prev[2] + dt[2]
# merge predicted and measured uptimes
split(merge_meas(t_up_est[1], t_up_est[2], t_up_meas[1], t_up_meas[2]), t_up_est)
t_up_est[2] = sqrt( t_up_est[2]^2.0 + (t_up_est[1] - t_up_prev[1] - dt[1])^2.0 )
t_up_est_str = sigfig(t_up_est[1], t_up_est[2])
# evaluate measured boot time, t0
t0_est[1] = t_meas[1] - t_up_est[1]
t0_est[2] = t_meas[2] + t_up_est[2]
# merge previous and updated boot time, t0
split(merge_meas(t0_est[1], t0_est[2], t0_prev[1], t0_prev[2]), t0_est)
t0_est[2] = sqrt( t0_est[2]^2.0 + (t0_est[1] - t0_prev[1])^2.0 )
t0_est_str = sigfig(t0_est[1], t0_est[2])
print(t_meas_str, t_up_est_str, t0_est_str)
}
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