Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!mit-eddie!uw-beaver!sumax!amc-gw!pilchuck!dataio!peterson
From: peterson@Data-IO.COM (Joe Peterson)
Newsgroups: comp.unix.questions
Subject: UNIX process id trace
Keywords: unix pid
Message-ID: <2738@dataio.Data-IO.COM>
Date: 9 Oct 90 23:59:47 GMT
Organization: Data I/O Corporation; Redmond, WA
Lines: 29

I have a simple question:

Is there a way to get the parent process id of any arbitrary
process id?  I know of getpid() and getppid(), but those only
operate on the current process.

I want to build a pid trace for the current process such as

        long pidtrace[REALLYBIG];
        long pid;
        int i;

        i=0;
        pid = getpid();

        while(pid != BOOTPROCESS)
        {
                pidtrace[i] = pid;

                ++i;
                pid = parentpid(pid);
        }

where parentpid() is the magic function that I can't find.

Any ideas?

Joe Peterson
peterson@Data-IO.COM