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I tried google, but found getppid() which gets the parent pid of the current process.
I need something like getppid(some_other_pid), is there such a thing? Basically takes the pid of some process and returns the parent process’ pid.
I think the simplest thing would be to open "/proc" and parse the contents.
You’ll find the ppid as the 4th parameter of /proc/pid/stat
In C, libproc has a
get_proc_statsfunction for parsing that file: see Given a child PID how can you get the parent PID for an example.