interface now needs to be defined in sledconf

Author: Draradech

src/modules/out_5a_75e.c

@@ -32,6 +32,13 @@
 #define WIDTH 256
 #define HEIGHT 256
 
+#define xstr(x) str(x)
+#define str(x) #x
+
+#ifndef INTERFACE
+#error "define INTERFACE in sledconf"
+#endif
+
 typedef struct
 {
   uint8_t b;
@@ -131,7 +138,7 @@ int init(void) {
 
   /* Get the index of the interface to send on */
   memset(&if_idx, 0, sizeof(struct ifreq));
-  strncpy(if_idx.ifr_name, "eth0", IFNAMSIZ-1);
+  strncpy(if_idx.ifr_name, xstr(INTERFACE), IFNAMSIZ-1);
   if (ioctl(sockfd, SIOCGIFINDEX, &if_idx) < 0)
   {
     perror("SIOCGIFINDEX");