Shawn, Lennart, Kay,
On Wed, Feb 6, 2013 at 7:33 PM, Shawn Landden <shawnlandden@xxxxxxxxx> wrote:
> Signed-off-by: Shawn Landden <shawnlandden@xxxxxxxxx>
> ---
> man2/prctl.2 | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index e4a1030..fd78f48 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -379,6 +379,23 @@ if the kernel is configured with
> .B CONFIG_SECCOMP
> enabled.
> .TP
> +.BR PR_SET_CHILD_SUBREAPER " (since Linux 3.3)"
> +Designates this process as a service manager for its' (immediate and
> +indirect) offspring processes. Any process whose immediate parent
> +dies and whose ancestry includes a process where this flag is set will
> +be reparented to the closest process with this flag set, instead of PID
> +1. A 'subreaper' hence receives
> +.B SIGHCLD
> +signals for any orphaned
> +offspring processes, that otherwise would be received by
> +.BR init (8).
> +.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 .
Shawn, there was some imprecision in your patch. I've instead come up
with an alternative.
Kay, Lennart, is the following correct?
PR_SET_CHILD_SUBREAPER (since Linux 3.4)
If arg2 is nonzero, set the "child subreaper" attribute
of the calling process; if arg2 is zero, unset the
attribute. When a process is marked as a child sub‐
reaper, all of the children that it creates, and their
descendants, will be marked as having a subreaper. in
effect, a subreaper fulfills the role of init(1) for its
descendant processes. Upon termination of a process
that is orphaned (i.e., its immediate parent has already
terminated) and marked as having a subreaper, the near‐
est still living ancestor subreaper will receive a
SIGCHLD signal and be able to wait(2) on the process to
diiscover its termination status.
PR_GET_CHILD_SUBREAPER (since Linux 3.4)
Return the "child subreaper" setting of the caller, in
the location pointed to by (int *) arg2.
Cheers,
Michael
--
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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