Script creating new processes

[jones33]

Hi,

I would like to check if my understanding is correct of how a single script creates new processes.

When the script starts initially it creates a new process. This is the parent process. Then as new processes are spawned within the script they will have a new PID but the PPID will be the same as the PID of the main script.

If anyone of the new processes creates a new process then the new process will have the same PPID as its parent's PID.

Therefore all processes created from within a script will have some sort of Parent\Child relationship.

Is my understanding correct?

Many Thanks

 

[Annihilannic]

All correct apart from this:

If anyone of the new processes creates a new process then the new process will have the same PPID as its parent's PID.

If any one of the new processes creates a new process, let's call it the grandchild of the original process, then it's PPID will be the PID of the child of the original process, e.g.

[TT]parentscript, PID 253
childprocess1, PID 254, PPID 253
grandchildprocess, PID 255, PPID 254
childprocess2, PID 256, PPID 253[/tt]

Does that make sense?

Annihilannic.

 

[Annihilannic]

Actually... re-reading what you said... I think that's what you meant anyway, so you were correct in the first place

Annihilannic.

 

[PHV]

You may have a look here: faq822-4603

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ181-2886