From 6968b9e7d3cf2019a7ba3a73692c1c9d15989fe1 Mon Sep 17 00:00:00 2001
From: imp <imp@FreeBSD.org>
Date: Mon, 21 Apr 2003 04:30:12 +0000
Subject: Put an anti-foot-shooting measure in place.  Set
 hw.bus.devctl_disable to 0 when we startup.  Print a warning in this case. 
 This allows people that are playing with devd by hand to have something
 happen. Otherwise, it appears that devd isn't working because /dev/devctl is
 disabled and producing no events.

Suggested by: peter on irc a long time ago.
---
 sbin/devd/devd.cc | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'sbin/devd')

diff --git a/sbin/devd/devd.cc b/sbin/devd/devd.cc
index 9a0ea0e..bc598fe 100644
--- a/sbin/devd/devd.cc
+++ b/sbin/devd/devd.cc
@@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/types.h>
+#include <sys/sysctl.h>
 
 #include <ctype.h>
 #include <dirent.h>
@@ -58,6 +59,7 @@ __FBSDID("$FreeBSD$");
 #include "devd.h"
 
 #define CF "/etc/devd.conf"
+#define SYSCTL "hw.bus.devctl_disable"
 
 using namespace std;
 
@@ -783,6 +785,22 @@ usage()
 	exit(1);
 }
 
+static void
+check_devd_enabled()
+{
+	int val = 0;
+	size_t len;
+
+	len = sizeof(val);
+	if (sysctlbyname(SYSCTL, &val, &len, NULL, NULL) != 0)
+		errx(1, "devctl sysctl missing from kernel!");
+	if (val) {
+		warnx("Setting " SYSCTL " to 0");
+		val = 0;
+		sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
+	}
+}
+
 /*
  * main
  */
@@ -791,6 +809,7 @@ main(int argc, char **argv)
 {
 	int ch;
 
+	check_devd_enabled();
 	while ((ch = getopt(argc, argv, "d")) != -1) {
 		switch (ch) {
 		case 'd':
-- 
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