Re: bugs in trap signal handling

[Tinni]

Chet Ramey wrote:
> 
> On 10/10/12 2:53 AM, lanshun zhou wrote:
>> Red Hat Enterprise Linux Server release 6.2 (Santiago)
>> uname -r:   2.6.32-220.17.1.el6.x86_64
>> bash version: bash-4.1.2-9.el6_2.src.rpm  (also tested with bash-4.2
>> compiled from source
>> with patches bash42-001~bash42-037)
>> 
>> When interrupt_immediately is set, handler for signals registered by trap
>> is called
>> immediately after the signal is triggered. But many function calls in
>> trap_handler
>> are not async-signal-safe, so it's unsafe and could cause bash to enter
>> a deadlock.
> 
> Thanks for the report.  This has been under discussion for a long time.
> 
> There are a couple of issues: how one satisfies users' expections of
> responsiveness, and what to do with partially-read input.  The work on
> that continues.
> 
> Right now, I've been running a slightly modified version of your script
> (I changed the echo -n ? to echo ? to avoid stdio buffering issues) for
> over an hour on a RHEL5 system without any lockups.  I have ideas about
> what to do to reduce the potential deadlock window, but I need a way to
> measure the effect of those changes.
> 
> Chet
> 
> -- 
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
>``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, ITS, CWRUc...@case.edu   
> http://cnswww.cns.cwru.edu/~chet/
> 
> 
> 

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Need help for bash function return value

[Tinni]

Hi,

I am  very new to the shell scripting.. Need some pointers for getting the
return value in shell scripting.
The scripts are mentioned below:

I want the values (  db_host_user, db_host, ORACLE_SID)  should be returned
from the clonesel to test1.sh

If i set the  script inside  the test1.sh  as  

val=`ssh remoteserver '/bin/sh clonesel' `,

then it is also not rot returning value.. 

Pl. advice  how can I get the values  in test1.sh.

Thanks in advance
-Tinni



-
I have one script  as test1.sh. The script is as 

#!/bin/bash
ssh remoteserver '/bin/sh clonesel'


--
In the remote server , the script  clonesel is as follows:


#!/bin/bash

echo
echo -e "\e[1;31m\tSetup Oracle Environments \e[0m"
echo -e "\t--"
echo
echo
echo -en "\e[1;32m\tType DB OS User Name :\e[0m"
read db_host_user
echo
echo -en "\e[1;32m\tType Database Host Name :\e[0m"
read db_host
echo
echo -en "\e[1;32m\tType Database Name :\e[0m"
read ORACLE_SID

export ORACLE_SID
export ORACLE_HOME=`cat /var/opt/oracle/oratab  | grep -v "#" |grep
$ORACLE_SID | awk -F ":" '{print $2 }'`
export PATH=$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATH
sqlplus -s / as sysdba < /tmp/1
set echo off
set head off
set pause off
select open_mode from v\$database;
EOF
db_s=`cat /tmp/1 |grep "."`
echo
echo -e "\e[1;33m\tDatabase Name Set to  : *** $ORACLE_SID *** \e[0m"
echo
echo -e "\e[1;33m\tDatabase Mode Set to  : *** $db_s *** \e[0m"
echo
echo -e "\e[1;34mPress Enter to Continue ..\e[0m"

exit  0

read dummy
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