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authorStephen Kitt <steve@sk2.org>2020-04-23 21:36:49 +0300
committerJonathan Corbet <corbet@lwn.net>2020-04-28 21:39:33 +0300
commit6bc47621cbf357a9b7bab3890489804f38916a35 (patch)
treee31d1ec1b8e1669ad2398b5030482b7c5c145ffe /Documentation/admin-guide/sysctl
parent2ad9a844fc83282d7f4e71baa82ffa2c0ae88c63 (diff)
downloadlinux-6bc47621cbf357a9b7bab3890489804f38916a35.tar.xz
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 <steve@sk2.org> Link: https://lore.kernel.org/r/20200423183651.15365-1-steve@sk2.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/admin-guide/sysctl')
-rw-r--r--Documentation/admin-guide/sysctl/kernel.rst10
1 files changed, 10 insertions, 0 deletions
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
============