CODEWITHSUNDEEP
clinuxprocess
daisy
daisy

Reputation: 23489

How can one tell the parent pid of a process , out of that process?

I know getppid retrieves the parent pid of the underlying program, but how can you tell this out of that program? I can't find anything useful in /proc/[pid], or is there any useful API that i can use?

UPDATE

I mean , i'm inspecting these procress with another process , so getppid won't work here

Upvotes: 2

Views: 161

Answers (2)

Mat
Mat

Reputation: 206659

That information is present in /proc/<pid>/stat, and more readably in /proc/<pid>/status:

$ grep PPid /proc/$$/status
PPid:   10615
$ awk '{print $4}' /proc/$$/stat
10615
$ ps -ef
...
me 10616 10615  0 11:04 pts/2    00:00:00 bash

Upvotes: 1

nosid
nosid

Reputation: 50024

It is the fourth field in /proc/[pid]/stat. It is documented in the man page proc(5).

Upvotes: 2

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