command timeout in ksh


 
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# 1  
Old 09-07-2012
command timeout in ksh

I probably read all the threads in almost all the forums for a solution to my need. I am a beginner in shell scripting and I dont have a perfect solution yet. Below is my code snippet.
Code:
idql -n $REPOSITORY_NAME.$cs -Udmadmin -P"" -R$DM_SCRIPTS/test.api > /dev/null 2>&1 
    if [ $? != 0 ]; then 
      echo "   \c" 
      echo "ERROR: Cannot connect to: $REPOSITORY_NAME.$cs on $HOST" 
    else 
      echo "   Successfully connected to: $REPOSITORY_NAME.$cs" 
    fi

This is from the main logic that we use for monitoring our service. But we often see our service getting hung and so the first line of the above snippet gets hung and it doesnt proceed after that. Due to this we are not able to catch this 'service hung' condition.

Most importantly we have to retain the checks for the existing conditions (specified in the if-else conditional statements) and additionally we have to be checking for the 'hung' state. If the idql command takes more than 5 seconds, we can assume that it is hung.

Could you please help me achieve this.
# 2  
Old 09-07-2012
i dont know idql but many connectivity tools such as ssh, scp and others have timeout option in them which can be use as a leverage. can you try

Code:
idql --help

# 3  
Old 09-07-2012
idql --help

Thanks for your reply.

idql --help
syntax: idql<docbase> [-U<user>] [-D<domain>] [-P<password>] [-K<secure flag>] [ -R<input file>] [-n] [-l<error level>] [-X] [-z] [-w<display width>]


There is no in-built timeout option. We have to manually timeout the command after say 5 seconds.
# 4  
Old 09-07-2012
i dont know any other method but this probably is worth a try. If your script is named test.sh run it like below, sleep 10 is 10 seconds after the script started, after that it will be killed. Once its killed you can be sure it timedout. lets see if other folks have more idea.

Code:
-bash-3.2$ ./test.sh & sleep 10 ;pkill test.sh
[2] 26221
[2]+  Terminated              ./test.sh
-bash-3.2$

# 5  
Old 09-07-2012
Thanks ryandegreat25.

In this case, how to capture the result of the command, i.e, if the command is not hung, how to know whether it was a success or failure.
./test.sh
if [[ $?!=0 ]] will be true even if its a usual failure condition or a service hung condition, right?

I want to be able to catch 3 different conditions separately and print error messages correspondingly.
# 6  
Old 09-07-2012
Not sure if this is the best way to do this Smilie you might want to create a script inside a script.

if successful, pkill wont be able to kill any which will result to exit code 1 else it will be 0

Code:
-bash-3.2$ ./test.sh & sleep 10 ;pkill test.sh
[1] 28058
[1]+  Done                    ./test.sh
-bash-3.2$ echo $?
1
-bash-3.2$

in your case you might want to put idql in script1 and then the conditional test in script2, though im afraid it cant capture failed or success. Smilie maybe some conditional test again in script1.

Just to add the normal execution will be 0 and failure will be something else, the kill only happens if it hang so this is where the 2nd script comes in.

Last edited by ryandegreat25; 09-07-2012 at 05:38 AM..
This User Gave Thanks to ryandegreat25 For This Post:
# 7  
Old 09-07-2012
Anybody has any other solutions please?
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