Index: qemu/linux-user/syscall.c
===================================================================
--- qemu.orig/linux-user/syscall.c
+++ qemu/linux-user/syscall.c
@@ -1736,6 +1736,8 @@ static long do_ipc(long call, long first
 
     switch (call) {
     case IPCOP_semop:
+	    ret = -EINVAL;
+	    break;
     {
 	struct sembuf *target_sops;
 	int i;