roberts
Group: Members
Posts: 4983
Joined: Oct. 2003 |
 |
Posted: Feb. 18 2007,05:46 |
 |
Reading this script and a request for how to handle timeout, made me think of such capability using Lua sockets.
So, just for fun, I cobbed together this little Lua socket program.
It is working well for me. I run it manually prefixed with sudo.
I did not call date using sudo as in newOldUser's original, as I call this lua program from /opt/bootlocal.sh
Now when I boot my machine, I have a much more accurate clock set.
You can see socket level programming is at a lower level than calling bash functions. But it does provide much more control.
| Code Sample | #! /bin/lua
--[[
# This lua script based in part of the idea expressed in
# the bash script from newOldUser of the damnsmall linux forums
# by Robert Shingledecker - 2007/02/17
# This script gets time information from time.nist.gov in
# universal time format. It then rearranges it into
# the format that the date command uses MMDDhhmmCCYY.ss
# and issues the date command as super user.
#
# An internet connection must be available
#
# sample of returned information follows
#54144 07-02-13 16:14:43 00 0 0 95.3 UTC(NIST) *
#1---0----1----1----2----2----3----3----4----4----5
#1---5----0----5----0----5----0----5----0----5----0
#
--]]
host = "time.nist.gov"
port = 13
target = {10,13,16,19,7,22}
date = ""
timeserver,err = socket.connect(host,port)
if err then
print("Could not connect "..err)
os.exit(1)
end
_,err = timeserver:send("anything\n")
if err then
print("Error in sending "..err)
os.exit(1)
end
timeserver:settimeout(0.10)
while 1 do
line,err = timeserver:receive('*l')
if err then
print("Error in receiving "..err)
os.exit(1)
end
if string.find(line,"UTC") then
for i = 1, 6 do
if i == 5 then date = date .. "20" end
if i == 6 then date = date .. "." end
date = date .. string.sub(line,target[i],target[i]+1)
end
os.execute("date -u "..date)
os.exit(0)
end
end
|
Edited by roberts on Feb. 20 2007,19:31
|
.
DSL Market ,
Great VPS hosting provided by Tektonic
