Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Pass return value of a function in background process

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Pass return value of a function in background process
# 8  
Old 02-15-2016
If you need really put something to do in background, then do something (parallel) and after that wait the child process to end, solution could be something like:

Code:
child()
{
  parentfile=$1

  do_something
  stat=$?

  echo "mypid=$$
           mystat=$stat" > $parentfile
}


#########
# MAIN

# file to use get answer from child process
childfile=$$.child.txt

# start child
child $childfile >/dev/null 2>&1  &
# save child process PID
CHILDPID=$!

do_something

# wait child process to end
wait $CHILDPID

# source childfile answer
. $childfile
# and destroy it
rm -f $childfile 2>/dev/null 

# use values
echo "child pid=$mypid"
echo "stat=$mystat"

Other method is to use event methods to communicate between process (trap + kill). Use file to move values between process. I like more event methods. There are not any shared variables. Of course you can use also named pipes between process. Source file is so easy.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Function - Make your function return an exit status

Hi All, Good Day, seeking for your assistance on how to not perform my 2nd, 3rd,4th etc.. function if my 1st function is in else condition. #Body function1() { if then echo "exist" else echo "not exist" } #if not exist in function1 my all other function will not proceed.... (4 Replies)
Discussion started by: meister29
4 Replies

2. Shell Programming and Scripting

Return: can only `return' from a function or sourced script

Not sure where the problem is. I can run the script without any issue using the following command. . /opt/app/scripts/cdc_migration.sh But it fails with the below error when I try it this way /opt/app/scripts/cdc_migration.sh /opt/app/scripts/cdc_migration.sh: line 65: return: can only... (1 Reply)
Discussion started by: svajhala
1 Replies

3. Shell Programming and Scripting

How to return from background process and check if it is running or not?

Hi Team, i am executing 3 scripts in background from 1 script and i want to send a message once the script gets completed.these scripts usually takes 1 hr to complete. My sample script is below, Vi abc.sh sh /opt/data/Split_1.sh & sh /opt/data/Split_2.sh & sh /opt/data/Split_3.sh & ... (3 Replies)
Discussion started by: raju2016
3 Replies

4. Shell Programming and Scripting

Capturing the return code from background process

Hi All, I was out not working on unix from quite sometime and came back recently. I would really appreciate a help on one of the issue I am facing.... I am trying to kick off the CodeNameProcess.sh in PARALLEL for all the available codes. The script runs fine in parallel. Let say there are... (1 Reply)
Discussion started by: rkumar28
1 Replies

5. Shell Programming and Scripting

Background process, return code and pid.

Hey all, Okay, this one is tricky and I'm not sure there is a niec way to do it, or indeed anyway to do it. The main issue revolves around timing out a hung ssh. I am doing this by creating a wrapper script for the ssh with the following requirements. My requirements are: Defineable... (5 Replies)
Discussion started by: RECrerar
5 Replies

6. Shell Programming and Scripting

How to put FTP process as a background process/job in perl?

Hi, I am using net::ftp for transferring files now i am trying in the same Linux server as a result ftp is very fast but if the server is other location (remote) then the file transferred will be time consuming. So i want try putting FTP part as a background process. I am unaware how to do... (5 Replies)
Discussion started by: vanitham
5 Replies

7. Programming

C function to start process but to return right away

Hello, I am using C on a Centos box with gcc as the compiler. I want a function to do something, them make an http request to some server (most probably using curl but suggestions are welcome) and return right away without waiting for the server's answer on that request. What should I use... (8 Replies)
Discussion started by: JCR
8 Replies

8. Shell Programming and Scripting

Return code of background process

Hi, I have a process that I run in the background that looks like this ${BASEDIR}/ksh/sqler.ksh ${compnames003} & and I would like to get the return code of the sqler.ksh script. so my code is like this ${BASEDIR}/ksh/sqler.ksh ${compnames003} & retcode=$? (3 Replies)
Discussion started by: c19h28O2
3 Replies

9. Shell Programming and Scripting

How to include RETURN KEY with Background process "&" in Shell Script

Hello All, I am a newbie in Shell script programming, and maybe you can help me with my query. I need to write a shell script (mntServer.ksh) that will start a background process and also to be able to run another script. The mntServer.ksh script contains: #!/bin/ksh... (1 Reply)
Discussion started by: racbern
1 Replies

10. Shell Programming and Scripting

background process return code

Hi I have the following piece of code that is calling another child process archive.ksh in the background while read file; do file_name=`ls $file`; ksh archive.ksh $file_name &; done < $indirect_file The problem is, indirect_file may contain anwhere from 2 to 20 different... (5 Replies)
Discussion started by: Vikas Sood
5 Replies
Login or Register to Ask a Question

LEARN ABOUT OSF1

uudemon.cleanu

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)