Re: [PATCH] prctl.2: PR_{SET,GET}_CHILD_SUBREAPER

["Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

[CC=+Lennart et al.]

Lennart,

Could you please review Shawn's patch or provide an alternative?

Thanks,

Michael


On Thu, Aug 9, 2012 at 9:09 PM,  <shawnlandden-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> From: Shawn Landden <shawnlandden-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>
> ---
>  man2/prctl.2 |   26 +++++++++++++++++++++++++-
>  1 file changed, 25 insertions(+), 1 deletion(-)
>
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index f866f04..b1a005e 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -42,10 +42,12 @@
>  .\" 2012-04-25 Michael Kerrisk, Document PR_TASK_PERF_EVENTS_DISABLE and
>  .\"                            PR_TASK_PERF_EVENTS_ENABLE
>  .\" 2012-08-03 Shawn Landden, Document PR_SET_NO_NEW_PRIVS, PR_GET_NO_NEW_PRIVS,
> -.\"       SECCOMP_MODE_STRICT, SECCOMP_MODE_FILTER
>  .\"       (thx Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org> 259e5e6c)
> +.\"       SECCOMP_MODE_STRICT, SECCOMP_MODE_FILTER,
>  .\"       PR_SET_TIMERSLACK, PR_GET_TIMESLACK, ARM alignment trap handler
>  .\"       PR_SET_PTRACER
> +.\"       PR_SET_CHILD_SUBREAPER, PR_GET_CHILD_SUBREAPER
> +.\"       (thx Lennart Poettering <lennart-mdGvqq1h2p+GdvJs77BJ7Q@public.gmane.org> ebec18a6)
>  .\"
>  .TH PRCTL 2 2012-08-03 "Linux" "Linux Programmer's Manual"
>  .SH NAME
> @@ -323,6 +325,7 @@ This operation is only available if the kernel is configured with
>  enabled.
>  .TP
>  .BR PR_SET_PTRACER " (since Linux 3.3)"
> +.\" see commit ebec18a6d3aa1e7d84aab16225e87fd25170ec2b
>  When using restricted ptrace, permit process of pid
>  .I arg2
>  to ptrace the current task. A value of 0 means "no process", and the special
> @@ -334,6 +337,27 @@ when the kernel has been configured with
>  .B CONFIG_SECURITY_YAMA
>  and the yama LSM is active.
>  .TP
> +.BR PR_SET_CHILD_SUBREAPER " (since Linux 3.3)"
> +Sets a process, such as a service manager, such that orphan (double-forking)
> +child processes re-parent to this process instead of
> +.BR init (8).
> +The service manager
> +is able to receive
> +.B SIGCHLD
> +signals and is able to investigate the process until
> +it calls
> +.BR wait (2).
> +All children of this process will inherit a flag if they should
> +look for a child_subreaper process at exit. Set
> +.I arg2
> +to 1 or 0 to enable or disable, respectively.
> +.TP
> +.BR PR_GET_CHILD_SUBREAPER " (since Linux 3.3)"
> +Returns whether calling process is a child subreaper (see
> +.BR PR_SET_CHILD_SUBREAPER ),
> +in the location pointed to by
> +.IR "(int\ *) arg2" .
> +.TP
>  .BR PR_SET_SECUREBITS " (since Linux 2.6.26)"
>  Set the "securebits" flags of the calling thread to the value supplied in
>  .IR arg2 .
> --
> 1.7.9.5
>



-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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