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Full Discussion: BASH - Handling background processes - distributed processing
Top Forums Shell Programming and Scripting BASH - Handling background processes - distributed processing Post 302514591 by dcarrion87 on Sunday 17th of April 2011 02:07:03 AM
Old 04-17-2011
BASH - Handling background processes - distributed processing
NOTE: I am using BASH and Solaris 10 for this.

Currently in the process of building a script that has a main "watcher" daemon that reads a configuration file and starts background processes based on it's global configuration. It is basically an infinite loop of configuration reading. Some of the background processes do things like "decrypting files" and "encrypting files" all from a configuration table that is read in. Yes the sub processes have configuration files also. The idea is that the watcher process calls the sub process with an "ID" that is valid in the sub processes' configuration.

What I'm having trouble deciding on is how to deal with things like notifications via email on how the sub process finished. They run in the background from the watcher process so assuming after it's finished I can't tell the watcher what happened. These sub processes can be called without the watcher as well. E.g.

Code:
# ClientDataDecrypt 1

Where 1 is the ID from a table configuration.

My thoughts were to:
1. Have the watcher touch a stat file when it kicks off the particular subtask. The sub process can then update this. I can also use this to stop the watcher from kicking off another sub process too quickly.
2. Have the watcher pass the relevant email addresses to the sub process and let the sub process handle the notifications. There still may be an issue with spam notifications if the sub process fails on particular files.

Sorry if I have confused what I'm trying to do. Your thoughts and feedback are welcome.

---------- Post updated at 04:07 PM ---------- Previous update was at 02:42 PM ----------

Thinking further about this I'm thinking that when I kick off the sub process I have it spit to an output file:

Code:
# ClientDataEncrypt -i <id> -o <path>_<id>_<parent>.lock

Where ID is the ID in the config, <path> is the parent file path, and <parent> is the parent (watcher) process ID.

I can then from the watcher keep checking for files matching the above criteria as it parses through. The out file can have something like this to read in:

SUCCESS=
FAIL=
SOURCE_DIR=
DEST_DIR=

It can then construct a notification based on this.
 

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killall

killall(1M)															       killall(1M)

NAME

       killall - kill all active processes

SYNOPSIS

       [signal]

DESCRIPTION

       is a procedure used by to kill all active processes not directly related to the shutdown procedure.

       is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted.  sends
       the specified signal to all user processes in the system, with the following exceptions:

	      the process;

	      all processes (including background processes) associated with the terminal from which was invoked;

	      any process, if owned by

	      any process, if owned by

	      any process;

	      any process;

	      any process.

       obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).

       If no signal is specified, a default of (kill) is used.

       is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).

FILES

SEE ALSO

       fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).

STANDARDS CONFORMANCE

																       killall(1M)
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