Add a "fork" of musl as //fusl.

fusl/include/net/if.h

+#ifndef _NET_IF_H
+#define _NET_IF_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#define IF_NAMESIZE 16
+
+struct if_nameindex
+{
+        unsigned int if_index;
+        char *if_name;
+};
+
+unsigned int if_nametoindex (const char *);
+char *if_indextoname (unsigned int, char *);
+struct if_nameindex *if_nameindex (void);
+void if_freenameindex (struct if_nameindex *);
+
+
+
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+
+#include <sys/socket.h>
+
+#define IFF_UP  0x1
+#define IFF_BROADCAST 0x2
+#define IFF_DEBUG 0x4
+#define IFF_LOOPBACK 0x8
+#define IFF_POINTOPOINT 0x10
+#define IFF_NOTRAILERS 0x20
+#define IFF_RUNNING 0x40
+#define IFF_NOARP 0x80
+#define IFF_PROMISC 0x100
+#define IFF_ALLMULTI 0x200
+#define IFF_MASTER 0x400
+#define IFF_SLAVE 0x800
+#define IFF_MULTICAST 0x1000
+#define IFF_PORTSEL 0x2000
+#define IFF_AUTOMEDIA 0x4000
+#define IFF_DYNAMIC 0x8000
+#define IFF_LOWER_UP 0x10000
+#define IFF_DORMANT 0x20000
+#define IFF_ECHO 0x40000
+#define IFF_VOLATILE (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_BROADCAST| \
+        IFF_ECHO|IFF_MASTER|IFF_SLAVE|IFF_RUNNING|IFF_LOWER_UP|IFF_DORMANT)
+
+struct ifaddr {
+        struct sockaddr ifa_addr;
+        union {
+                struct sockaddr ifu_broadaddr;
+                struct sockaddr ifu_dstaddr;
+        } ifa_ifu;
+        struct iface *ifa_ifp;
+        struct ifaddr *ifa_next;
+};
+
+#define ifa_broadaddr   ifa_ifu.ifu_broadaddr
+#define ifa_dstaddr     ifa_ifu.ifu_dstaddr
+
+struct ifmap {
+        unsigned long int mem_start;
+        unsigned long int mem_end;
+        unsigned short int base_addr;
+        unsigned char irq;
+        unsigned char dma;
+        unsigned char port;
+};
+
+#define IFHWADDRLEN     6
+#define IFNAMSIZ        IF_NAMESIZE
+
+struct ifreq {
+        union {
+                char ifrn_name[IFNAMSIZ];
+        } ifr_ifrn;
+        union {
+                struct sockaddr ifru_addr;
+                struct sockaddr ifru_dstaddr;
+                struct sockaddr ifru_broadaddr;
+                struct sockaddr ifru_netmask;
+                struct sockaddr ifru_hwaddr;
+                short int ifru_flags;
+                int ifru_ivalue;
+                int ifru_mtu;
+                struct ifmap ifru_map;
+                char ifru_slave[IFNAMSIZ];
+                char ifru_newname[IFNAMSIZ];
+                void *ifru_data;
+        } ifr_ifru;
+};
+
+#define ifr_name        ifr_ifrn.ifrn_name
+#define ifr_hwaddr      ifr_ifru.ifru_hwaddr
+#define ifr_addr        ifr_ifru.ifru_addr
+#define ifr_dstaddr     ifr_ifru.ifru_dstaddr
+#define ifr_broadaddr   ifr_ifru.ifru_broadaddr
+#define ifr_netmask     ifr_ifru.ifru_netmask
+#define ifr_flags       ifr_ifru.ifru_flags
+#define ifr_metric      ifr_ifru.ifru_ivalue
+#define ifr_mtu         ifr_ifru.ifru_mtu
+#define ifr_map         ifr_ifru.ifru_map
+#define ifr_slave       ifr_ifru.ifru_slave
+#define ifr_data        ifr_ifru.ifru_data
+#define ifr_ifindex     ifr_ifru.ifru_ivalue
+#define ifr_bandwidth   ifr_ifru.ifru_ivalue
+#define ifr_qlen        ifr_ifru.ifru_ivalue
+#define ifr_newname     ifr_ifru.ifru_newname
+#define _IOT_ifreq      _IOT(_IOTS(char),IFNAMSIZ,_IOTS(char),16,0,0)
+#define _IOT_ifreq_short _IOT(_IOTS(char),IFNAMSIZ,_IOTS(short),1,0,0)
+#define _IOT_ifreq_int  _IOT(_IOTS(char),IFNAMSIZ,_IOTS(int),1,0,0)
+
+struct ifconf {
+        int ifc_len;            
+        union {
+                void *ifcu_buf;
+                struct ifreq *ifcu_req;
+        } ifc_ifcu;
+};
+
+#define ifc_buf         ifc_ifcu.ifcu_buf
+#define ifc_req         ifc_ifcu.ifcu_req
+#define _IOT_ifconf _IOT(_IOTS(struct ifconf),1,0,0,0,0)
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif