From 6bc47621cbf357a9b7bab3890489804f38916a35 Mon Sep 17 00:00:00 2001 From: Stephen Kitt Date: Thu, 23 Apr 2020 20:36:49 +0200 Subject: [PATCH] docs: sysctl/kernel: document cad_pid Based on the implementation in kernel/sysctl.c (the proc_do_cad_pid() function), kernel/reboot.c, and include/linux/sched/signal.h. Signed-off-by: Stephen Kitt Link: https://lore.kernel.org/r/20200423183651.15365-1-steve@sk2.org Signed-off-by: Jonathan Corbet --- Documentation/admin-guide/sysctl/kernel.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 55b24eada13c..82bfd5892663 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -116,6 +116,16 @@ run. The statistics can be seen using ``bpftool``. = =================================== +cad_pid +======= + +This is the pid which will be signalled on reboot (notably, by +Ctrl-Alt-Delete). Writing a value to this file which doesn't +correspond to a running process will result in ``-ESRCH``. + +See also `ctrl-alt-del`_. + + cap_last_cap ============ -- 2.11.0