Re: debugging threaded apps running under a clone(CLONE_NEWPID)

[Greg Kurz <gkurz@fr.ibm.com>]

On Tue, 2009-02-24 at 10:51 +0100, Cedric Le Goater wrote:
> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
> ---
>  fs/proc/base.c |   19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> Index: 2.6.27-mcr.git/fs/proc/base.c
> ===================================================================
> --- 2.6.27-mcr.git.orig/fs/proc/base.c
> +++ 2.6.27-mcr.git/fs/proc/base.c
> @@ -2444,6 +2444,23 @@ static int proc_tgid_io_accounting(struc
>  }
>  #endif /* CONFIG_TASK_IO_ACCOUNTING */
> 
> +static int proc_pid_vpids(struct task_struct *task, char *buffer)
> +{
> +	struct pid_namespace *pid_ns = task->nsproxy->pid_ns;
> +

This breaks if task is a zombie...

> +	return sprintf(buffer, "%6d %6d %6d %6d %6d %6d %6d %6d %6d %6d\n",
> +		       task_pid_nr_ns(task, pid_ns), // pid
> +		       task_pid_nr(task),
> +		       task_tgid_nr_ns(task, pid_ns), // tgid
> +		       task_tgid_nr(task),
> +		       task_tgid_nr_ns(task->real_parent, pid_ns), // ppid
> +		       task_tgid_nr(task->real_parent),
> +		       task_pgrp_nr_ns(task, pid_ns), // pgid
> +		       task_pgrp_nr(task),
> +		       task_session_nr_ns(task, pid_ns), // sid
> +		       task_session_nr(task));
> +}
> +
>  /*
>   * Thread groups
>   */
> @@ -2519,6 +2536,7 @@ static const struct pid_entry tgid_base_
>  #ifdef CONFIG_TASK_IO_ACCOUNTING
>  	INF("io",	S_IRUGO, tgid_io_accounting),
>  #endif
> +	INF("vpids",	S_IRUGO, pid_vpids),
>  };
> 
>  static int proc_tgid_base_readdir(struct file * filp,
> @@ -2854,6 +2872,7 @@ static const struct pid_entry tid_base_s
>  #ifdef CONFIG_TASK_IO_ACCOUNTING
>  	INF("io",	S_IRUGO, tid_io_accounting),
>  #endif
> +	INF("vpids",	S_IRUGO, pid_vpids),
>  };
> 
>  static int proc_tid_base_readdir(struct file * filp,
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-- 
Gregory Kurz                                     gkurz@fr.ibm.com
Software Engineer @ IBM/Meiosys                  http://www.ibm.com
Tel +33 (0)534 638 479                           Fax +33 (0)561 400 420

"Anarchy is about taking complete responsibility for yourself."
        Alan Moore.