Combined the interface set into the datalink_init for all the datalink layers. Changed all the demo programs to use datalink_init instead of specific datalink functions.

bacnet-stack/ports/linux/arcnet.c

@@ -178,7 +178,10 @@ static int arcnet_bind(char *interface_name)
 
 bool arcnet_init(char *interface_name)
 {
-    ARCNET_Sock_FD = arcnet_bind(interface_name);
+    if (interface_name)
+        ARCNET_Sock_FD = arcnet_bind(interface_name);
+    else
+        ARCNET_Sock_FD = arcnet_bind("arc0");
 
     return arcnet_valid();
 }

bacnet-stack/ports/linux/bip-init.c

@@ -71,7 +71,9 @@ static int get_local_address_ioctl(char *ifname,
     return rv;
 }
 
-void bip_set_interface(char *ifname)
+
+/* on Linux, ifname is eth0, ath0, arc0, and others. */
+static void bip_set_interface(char *ifname)
 {
     struct in_addr local_address;
     struct in_addr broadcast_address;
@@ -91,13 +93,15 @@ void bip_set_interface(char *ifname)
 #endif
 }
 
-bool bip_init(void)
+bool bip_init(char *ifname)
 {
     int status = 0;             /* return from socket lib calls */
     struct sockaddr_in sin;
     int sockopt = 0;
     int sock_fd = -1;
 
+    if (ifname)
+        bip_set_interface(ifname);
     /* assumes that the driver has already been initialized */
     sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
     bip_set_socket(sock_fd);

bacnet-stack/ports/linux/ethernet.c

@@ -170,8 +170,13 @@ static int get_local_hwaddr(const char *ifname, unsigned char *mac)
 
 bool ethernet_init(char *interface_name)
 {
-    get_local_hwaddr(interface_name, Ethernet_MAC_Address);
-    eth802_sockfd = ethernet_bind(&eth_addr, interface_name);
+    if (interface_name) {
+        get_local_hwaddr(interface_name, Ethernet_MAC_Address);
+        eth802_sockfd = ethernet_bind(&eth_addr, interface_name);
+    } else {
+        get_local_hwaddr("eth0", Ethernet_MAC_Address);
+        eth802_sockfd = ethernet_bind(&eth_addr, "eth0");
+    }
 
     return ethernet_valid();
 }