git: fedfe274225a - stable/12 - rc(8): document how to reload rc's configuration

The branch stable/12 has been updated by grahamperrin:

URL: https://cgit.FreeBSD.org/src/commit/?id=fedfe274225a60a9c7e3894b245027caab92470a

commit fedfe274225a60a9c7e3894b245027caab92470a
Author:     Mina Galić <freebsd@igalic.co>
AuthorDate: 2023-06-02 18:01:03 +0000
Commit:     Graham Perrin <grahamperrin@FreeBSD.org>
CommitDate: 2023-06-10 18:23:06 +0000

    rc(8): document how to reload rc's configuration
    
    The fact that rc(8) only reads its configuration once is in the man
    page, but how to trigger a reload is only in the code.
    
    Discovered while trying to make cloud-init disable and stop syslogd.
    
    Thanks to RhodiumToad for providing the words.
    
    Reviewed by:           debdrup, grahamperrin
    Approved by:           grahamperrin, imp
    Sponsored by:          The FreeBSD Foundation
    Differential revision: https://reviews.freebsd.org/D40329
    
    (cherry picked from commit 0981275c75d5678172eb9dd8fbc89ef61c05c979)
---
 share/man/man8/rc.8 | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/share/man/man8/rc.8 b/share/man/man8/rc.8
index ebd28cd85c2a..ebffeca09d63 100644
--- a/share/man/man8/rc.8
+++ b/share/man/man8/rc.8
@@ -31,7 +31,7 @@
 .\"     @(#)rc.8	8.2 (Berkeley) 12/11/93
 .\" $FreeBSD$
 .\"
-.Dd July 4, 2022
+.Dd June 1, 2023
 .Dt RC 8
 .Os
 .Sh NAME
@@ -124,10 +124,9 @@ to load various
 .Xr rc.subr 8
 shell functions to use.
 .It
-Load the configuration files.
+Load the configuration files (see below for reloading).
 .It
-Determine if booting in a jail,
-and add
+Determine if booting in a jail, and add
 .Dq Li nojail
 (no jails allowed) or
 .Dq Li nojailvnet
@@ -367,6 +366,17 @@ the command name (see the
 .Sx EXAMPLES
 section).
 .Pp
+The configuration files are normally read only once at the start of a boot
+sequence; if a script needs to
+.Cm enable
+or
+.Cm disable
+any other script that would run later in the sequence, it must send a
+.Dv SIGALRM
+to the rc process (identified by
+.Ev $RC_PID )
+to have it re-read the files.
+.Pp
 The following key points apply to old-style scripts in
 .Pa /usr/local/etc/rc.d/ :
 .Bl -bullet