Title: Auto-reboot
Description: Issues
feldmarschall - December 18, 2006 08:01 AM (GMT)
I've been looking through google and tons of places for references to Linux C++ commands and what not.
What I am going to do:
Write a program that checks say every 5 minutes if a specific program is already running, and if it is not, start it up.
Problem:
I have no idea how to do it.
For the program Im thinking to create a new thread that just has an infinite loop with some sort of pause. to start the program I probably would do system("./startup &)
But what I need to figure out is how to check if a program is already running?
Any help would be hot. Also if possible a link to some good documentation on generic Linux C++ programming.
myork - December 18, 2006 12:52 PM (GMT)
You need to look up cron.
cron is a service provided by the OS to run a program at set intervals.
Use
To edit your own personal crontab file.
The following command will run a script in your home directory every 5 minutes.
| QUOTE |
# run a command every 5 minutes. Output to log file
5 * * * * $HOME/mybin/myJob >> $HOME/mylog/mmyJobLog |
To check if a process is running use ps.
feldmarschall - December 19, 2006 08:20 AM (GMT)
K cron is driving me nuts. Im logged into the shell as user drakhl, and my home directory is /home2/drakhl.
I do crontab -e and I add my line of commands in.
So far what im doing is trying to run this every five minutes so I do
*/5 * * * * /src/startup
That should run the startup script but nothing happens..
Im a total noob with linux, does it matter if I have to run it with ./startup &
These are all the lines I've tried so far and none of them have worked.
*/5 * * * * /src/startup
*/5 * * * * /home2/drakhl/src/startup
*/5 * * * * startup
*/5 * * * * ./startup &
*/5 * * * * /src/ ./startup &
*/5 * * * * /home2/drakhl/src/ ./startup &
30 * * * * /src/ ./startup &
30 * * * * ./startup &
5 * * * * $HOME/src/startup
A little help please?
myork - December 19, 2006 09:47 AM (GMT)
Don't put a slash before the 5.
| QUOTE |
| */5 * * * * /src/startup |
Should probably be
| QUOTE |
| * 5 * * * * /src/startup |
Check that you can run /src/startup manually. Note that you must specify a full path name to the program.
Note: this command will not produce any output to the console. Therefore it is best to send output to a log file.
Note:
| QUOTE |
| 5 * * * * $HOME/src/startup |
will run this command every 5 hours.
feldmarschall - December 19, 2006 06:45 PM (GMT)
Ok * 5 * * * * /src/startup gives errors, because that is too many fields. You can only have 6.
the /5 is how you tell cron to run it every five minutes.
I tried all those commands and outputting them to a log..the log is there but it is blank..
What do you mean by running startup manually? If you mean can I run it from the shell then yes I've done so many times.
and Im trying the full path. I cded as far back as I can go and used that..
This is just weird that it doesnt work.
myork - December 20, 2006 01:19 PM (GMT)
What shell are you using?
Is the command you are running a script?
If so what is the first line (ie does it specify the shell it should be run in)?
feldmarschall - December 21, 2006 03:04 AM (GMT)
Like I said I am a linux noob. I am doing this on a remote shell. What command can I type to give me the name of the flavor Im running?
Here is the entire script. I know I go to the /src/ directory and type ./startup & to start it up.
| QUOTE |
#! /bin/csh -f
# Set the port number.
set port = 4100
if ( "$1" != "" ) set port="$1"
# Change to area directory.
cd ../area
# Set limits.
limit coredumpsize unlimited
limit stacksize unlimited
if ( -e shutdown.txt ) rm -f shutdown.txt
while ( 1 )
# If you want to have logs in a different directory,
# change the 'set logfile' line to reflect the directory name.
set index = 1000
while ( 1 )
set logfile = ../log/$index.log
if ( ! -e $logfile ) break
@ index++
end
# Record starting time
date > $logfile
date > ../area/boot.txt
# Run SMAUG.
# Check if already running
set matches = `netstat -an | grep ":$port " | grep -c LISTEN`
if ( $matches >= 1 ) then
# Already running
echo Port $port is already in use.
exit 0
endif
../src/swreality $port >&! $logfile
# Restart, giving old connections a chance to die.
if ( -e shutdown.txt ) then
rm -f shutdown.txt
exit 0
endif
sleep 10
end
|
myork - December 21, 2006 10:05 AM (GMT)
The script assumes that your current working directory is in "/src"
( or at least a directory where ../area and ../log are accessable)
To get it to work do:
If it runs now then it should run under cron.
