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 <steve@xxxxxxx> --- 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 ============ base-commit: 7b9121040d83eb9e332f7dbc140eca17643d3586 -- 2.20.1
