问题
If I fork and the child process then exec and creates more child processes (which themselves can create more processes) , how do I get a list of pids of all the descendent process from the first process?
Is there a better way then looping though /proc/ and checking the PPid (the parent of process's id) of each of process?
回答1:
Iterating through /proc is the "standard" way to do this. That's how ps and friends (pstree, etc.) are implemented.
回答2:
If you are looking for commands to see the process tree, check below commands.
ps -ejH
ps axjf
pstree $PID
Check the man pages of ps and pstree commands.
来源：https://stackoverflow.com/questions/20533979/how-to-get-all-descendent-child-process-id-of-pid-in-c-in-linux