Add support for OpenBSD to QEMU's tap driver.

Signed-off-by: Brad Smith <brad@comstyle.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

net/tap-bsd.c

diff --git a/net/tap-bsd.c b/net/tap-bsd.c
index efccfe0..2f3efde 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -43,8 +43,8 @@
     char *dev;
     struct stat s;
 
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-    /* if no ifname is given, always start the search from tap0. */
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
+    /* if no ifname is given, always start the search from tap0/tun0. */
     int i;
     char dname[100];
 
@@ -52,7 +52,11 @@
         if (*ifname) {
             snprintf(dname, sizeof dname, "/dev/%s", ifname);
         } else {
+#if defined(__OpenBSD__)
+            snprintf(dname, sizeof dname, "/dev/tun%d", i);
+#else
             snprintf(dname, sizeof dname, "/dev/tap%d", i);
+#endif
         }
         TFR(fd = open(dname, O_RDWR));
         if (fd >= 0) {