stubdom: drop lwip support

Network support is still provided the same way: using the tap
interface, created in qemu using netfront.
The lwip stack is still available to avoid additional compilation
issues.
However the stubdom is not going to have its own vif anymore,
this means that the only vnc server supported is the one in dom0.
You can still enable the vnc server in a stubdom at compile time, if
you want so.

Probably the most important change caused by this patch to xen users
is that you don't have to specify two vif in the stubdom config file
anymore, but just one:

-vif = [ '', 'ip=10.0.1.1,mac=aa:00:00:12:23:34']
+vif = ['ip=10.0.1.1,mac=aa:00:00:12:23:34']

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

1 files changed, 9 insertions, 7 deletions

diff --git a/extras/mini-os/lib/sys.c b/extras/mini-os/lib/sys.c
index 7c5f05cd41..12395bf730 100644
--- a/extras/mini-os/lib/sys.c
+++ b/extras/mini-os/lib/sys.c
@@ -677,7 +677,7 @@ static int select_poll(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exce
 {
     int i, n = 0;
 #ifdef HAVE_LWIP
-    int sock_n, sock_nfds = 0;
+    int sock_n = 0, sock_nfds = 0;
     fd_set sock_readfds, sock_writefds, sock_exceptfds;
     struct timeval timeout = { .tv_sec = 0, .tv_usec = 0};
 #endif
@@ -711,12 +711,14 @@ static int select_poll(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exce
 	    }
 	}
     }
-    DEBUG("lwip_select(");
-    dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
-    DEBUG("); -> ");
-    sock_n = lwip_select(sock_nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
-    dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
-    DEBUG("\n");
+    if (sock_nfds > 0) {
+        DEBUG("lwip_select(");
+        dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
+        DEBUG("); -> ");
+        sock_n = lwip_select(sock_nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
+        dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
+        DEBUG("\n");
+    }
 #endif
 
     /* Then see others as well. */