how to get parent process id (ppid) of another process

Subject: how to get parent process id (ppid) of *another* process
From: Aurélien Hugelé <email@hidden>
Date: Sun, 27 Nov 2005 01:52:52 +0100
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Hi list !

it's my first post here, because i'm not a low level guy, usually developing with Cocoa high level API... but low level UNIX knowledge is very important and very useful to understand what's behind the hood...

Well, for my project, i need to get the parent process id (ppid) of another process than the current one. Given its pid for example. In fact, i would like to get exactly what Activity Monitor.app get when using "All processes, Hierarchically" (in the pop up button at the top). The hierarchic mode is able to display the parent process of *any* process...

how is that achieved ? i look at tons of man pages, google etc... i could not find anything useful. I'm pretty sure there is no standart unix call for that but what do i know ? is it a private API ?

any help ?

thanks a lot !
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