I knew a process ID which creates a pocess, which inturn creates a process,
which in turn creates another process (like this down the line for about 10
process). Now I want to see what are all the process created down th line
from the pid of the first process. Is there any way/scheme to find it out.
There's a command called pstree which displays all processes as a tree.
pstree <pid> displays from the specified pid. But perhaps you wanted to do
this within a program instead of from a user terminal?
If you want it in your code, you can access the /proc/PID/status file,
where you have a PPid (parent Pid) field. I think this is what pstree
does.
However, I am not sure this is always good (or possible).
Consider process A creating B which creates C.
pstree will show:
init -> A -> B -> C
Now if B dies pstree will show:
init -> A
-> C
AFAIK, processes whose parent dies become children of init.
I don't know how (or if) you can retrive the info that C is a descendant
of A.
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