diff -r 7a0f1bf86516 tools/include/xen-sys/NetBSD/privcmd.h
--- a/tools/include/xen-sys/NetBSD/privcmd.h	Tue Jun 10 09:27:01 2008 +0100
+++ b/tools/include/xen-sys/NetBSD/privcmd.h	Tue Jun 10 10:49:17 2008 +0200
@@ -36,6 +36,7 @@ typedef struct privcmd_hypercall
 {
     unsigned long op;
     unsigned long arg[5];
+    long retval;
 } privcmd_hypercall_t;
 
 typedef struct privcmd_mmap_entry {
diff -r 7a0f1bf86516 tools/libxc/xc_netbsd.c
--- a/tools/libxc/xc_netbsd.c	Tue Jun 10 09:27:01 2008 +0100
+++ b/tools/libxc/xc_netbsd.c	Tue Jun 10 10:49:17 2008 +0200
@@ -142,9 +142,13 @@ static int do_privcmd(int xc_handle, uns
 
 int do_xen_hypercall(int xc_handle, privcmd_hypercall_t *hypercall)
 {
-    return do_privcmd(xc_handle,
+    int error = do_privcmd(xc_handle,
                       IOCTL_PRIVCMD_HYPERCALL,
                       (unsigned long)hypercall);
+    if (error)
+       return error;
+    else
+       return (hypercall->retval);
 }
 
 #define EVTCHN_DEV_NAME  "/dev/xenevt"