<p><b>@jia200x</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11879#discussion_r329535412">sys/net/netif/netif.c</a>:</p>
<pre style='color:#555'>> +
+#include <string.h>
+
+#include "errno.h"
+#include "net/netif.h"
+#include "utlist.h"
+
+static netif_t *netif_list;
+
+int netif_register(netif_t *netif)
+{
+    if(netif == NULL) {
+        return -EINVAL;
+    }
+
+    LL_APPEND(netif_list, netif);
</pre>
<p>done</p>

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