Re: [RFC] "biological parent" pid
From: Michael Buesch (mbuesch_at_freenet.de)
Date: 01/31/05
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- In reply to: Tim Schmielau: "[RFC] "biological parent" pid"
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To: Tim Schmielau <tim@physik3.uni-rostock.de> Date: Mon, 31 Jan 2005 23:09:46 +0100
Quoting Tim Schmielau <tim@physik3.uni-rostock.de>:
> The ppid of a process is not really helpful if I want to reconstruct the
> real history of processes on a machine, since it may become 1 when the
> parent dies and the process is reparented to init.
>
> I am not aware of concepts in Linux or other unices that apply to this
> case. So I made up the "biological parent pid" bioppid (in contrast to the
> adoptive parents pid) that just never changes.
> Any user of it must of course remember that it doesn't need to be a valid
> pid anymore or might even belong to a different process that was forked in
> the meantime. bioppid only had to be a valid pid at time btime (it's
> a (btime, pid) pair that unambiguously identifies a process).
>
> Comments? (other that I just broke /proc/nnn/status parsing once again :-)
Eh, I can't see how this bioppid would be useful.
Help me. Examples?
> Tim
>
>
> --- linux-2.6.10/include/linux/sched.h 2004-12-24 22:33:59.000000000 +0100
> +++ linux-2.6.10-ppid/include/linux/sched.h 2005-01-31 19:20:00.000000000 +0100
> @@ -556,6 +556,7 @@ struct task_struct {
> unsigned did_exec:1;
> pid_t pid;
> pid_t tgid;
> + pid_t bioppid; /* biological parents */
> /*
> * pointers to (original) parent process, youngest child, younger sibling,
> * older sibling, respectively. (p->father can be replaced with
>
> --- linux-2.6.10/kernel/fork.c 2004-12-24 22:33:59.000000000 +0100
> +++ linux-2.6.10-ppid/kernel/fork.c 2005-01-31 18:15:39.000000000 +0100
> @@ -889,6 +889,7 @@ static task_t *copy_process(unsigned lon
> p->tgid = p->pid;
> if (clone_flags & CLONE_THREAD)
> p->tgid = current->tgid;
> + p->bioppid = current->pid;
>
> if ((retval = security_task_alloc(p)))
> goto bad_fork_cleanup_policy;
>
> --- linux-2.6.10/fs/proc/array.c 2004-12-24 22:35:00.000000000 +0100
> +++ linux-2.6.10-ppid/fs/proc/array.c 2005-01-31 18:19:02.000000000 +0100
> @@ -165,6 +165,7 @@ static inline char * task_state(struct t
> "Tgid:\t%d\n"
> "Pid:\t%d\n"
> "PPid:\t%d\n"
> + "BioPPid:\t%d\n"
> "TracerPid:\t%d\n"
> "Uid:\t%d\t%d\t%d\t%d\n"
> "Gid:\t%d\t%d\t%d\t%d\n",
> @@ -172,6 +173,7 @@ static inline char * task_state(struct t
> (p->sleep_avg/1024)*100/(1020000000/1024),
> p->tgid,
> p->pid, pid_alive(p) ? p->group_leader->real_parent->tgid : 0,
> + p->bioppid,
> pid_alive(p) && p->ptrace ? p->parent->pid : 0,
> p->uid, p->euid, p->suid, p->fsuid,
> p->gid, p->egid, p->sgid, p->fsgid);
>
> --- linux-2.6.10/kernel/acct.c 2004-12-24 22:34:58.000000000 +0100
> +++ linux-2.6.10-ppid/kernel/acct.c 2005-01-31 18:19:35.000000000 +0100
> @@ -446,7 +446,7 @@ static void do_acct_process(long exitcod
> #endif
> #if ACCT_VERSION==3
> ac.ac_pid = current->tgid;
> - ac.ac_ppid = current->parent->tgid;
> + ac.ac_ppid = current->bioppid;
> #endif
>
> read_lock(&tasklist_lock); /* pin current->signal */
> -
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>
-- Regards Michael Buesch [ http://www.tuxsoft.de.vu ]
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