Messages in this thread | | | Date | Sat, 31 Jan 2004 21:12:33 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: More waitpid issues with CLONE_DETACHED/CLONE_THREAD |
| |
On Sat, 31 Jan 2004, Daniel Jacobowitz wrote: > > > > Can you verify that that process doesn't have any sub-threads? (Again, > > that should be easily visible in /proc/<pid>/task/). > > It is quite easily visible - in fact, it's hilarious. > > 8454 pts/8 Z 0:00 [linux-dp] <defunct> > > drow@nevyn:~% ls /proc/8454 > auxv cmdline cwd@ environ exe@ fd/ maps mem mounts root@ stat > > drow@nevyn:~% ls /proc/8454/task > ls: /proc/8454/task: No such file or directory
Oh damn. Yeah, we don't allow you to even see the threads in this case (it checks "pid_alive(task)". We don't want you to try to confuse things by opening files of processes that we think are dead.
For the case of trying to figure out sub-threads of a dead thread group leader, that may actually be a bug.
Just for testing this, you might remove the check for
if (!pid_alive(task)) goto out;
in proc_pident_lookup() in fs/proc/base.c.
Ingo - comments? We really want the sysadmin to be able to find threads that have a dead group leader, and right now that seems to be impossible.
Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |