From aaf3e744fd4e63742027d09d2eee91b1912ce8e2 Mon Sep 17 00:00:00 2001
From: Enji Cooper <ngie@FreeBSD.org>
Date: Fri, 26 Aug 2016 03:46:43 +0000
Subject: [PATCH] Detect virtual machines on FreeBSD using the kern.vm_guest
 sysctl

kern.vm_guest == none -> not a virtual machine

It's a bit of a misnomer with the function being named `isQEMU`... but FreeBSD's
support seems to be a bit more all-encompassing than NetBSD's is today.

Sponsored by: EMC / Isilon Storage Division
---
 contrib/netbsd-tests/lib/libc/gen/isqemu.h | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/contrib/netbsd-tests/lib/libc/gen/isqemu.h b/contrib/netbsd-tests/lib/libc/gen/isqemu.h
index e5e5ea4b586..c44ffda082a 100644
--- a/contrib/netbsd-tests/lib/libc/gen/isqemu.h
+++ b/contrib/netbsd-tests/lib/libc/gen/isqemu.h
@@ -41,6 +41,30 @@
 
 static __inline bool
 isQEMU(void) {
+#ifdef __FreeBSD__
+	char *vm_guest_name_buf;
+	size_t len;
+	bool is_vm;
+
+	if (sysctlbyname("kern.vm_guest", NULL, &len, NULL, 0) == -1)
+		err(EXIT_FAILURE, "sysctl");
+
+	if ((vm_guest_name_buf = malloc(len)) == NULL)
+		err(EXIT_FAILURE, "malloc");
+
+	if (sysctlbyname("kern.vm_guest", vm_guest_name_buf, &len, NULL, 0)
+	    == -1)
+		err(EXIT_FAILURE, "sysctl");
+
+	if (strcmp(vm_guest_name_buf, "none") == 0)
+		is_vm = false;
+	else
+		is_vm = true;
+
+	free(vm_guest_name_buf);
+
+	return is_vm;
+#else
 #if defined(__i386__) || defined(__x86_64__)
 	char name[1024];
 	size_t len = sizeof(name);
@@ -54,6 +78,7 @@ isQEMU(void) {
 #else
 	return false;
 #endif
+#endif
 }
 
 #ifdef TEST