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docs: sysctl/kernel: document cad_pid

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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@sk2.org>
Link: https://lore.kernel.org/r/20200423183651.15365-1-steve@sk2.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Stephen Kitt 2020-04-23 20:36:49 +02:00 committed by Jonathan Corbet
parent 2ad9a844fc
commit 6bc47621cb
1 changed files with 10 additions and 0 deletions
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Documentation/admin-guide/sysctl/kernel.rst
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@ -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 cap_last_cap
============ ============