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

fusl/src/network/netlink.h

+#include <stdint.h>
+
+/* linux/netlink.h */
+
+#define NETLINK_ROUTE 0
+
+struct nlmsghdr {
+        uint32_t        nlmsg_len;
+        uint16_t        nlmsg_type;
+        uint16_t        nlmsg_flags;
+        uint32_t        nlmsg_seq;
+        uint32_t        nlmsg_pid;
+};
+
+#define NLM_F_REQUEST   1
+#define NLM_F_MULTI     2
+#define NLM_F_ACK       4
+
+#define NLM_F_ROOT      0x100
+#define NLM_F_MATCH     0x200
+#define NLM_F_ATOMIC    0x400
+#define NLM_F_DUMP      (NLM_F_ROOT|NLM_F_MATCH)
+
+#define NLMSG_NOOP      0x1
+#define NLMSG_ERROR     0x2
+#define NLMSG_DONE      0x3
+#define NLMSG_OVERRUN   0x4
+
+/* linux/rtnetlink.h */
+
+#define RTM_NEWLINK     16
+#define RTM_GETLINK     18
+#define RTM_NEWADDR     20
+#define RTM_GETADDR     22
+
+struct rtattr {
+        unsigned short  rta_len;
+        unsigned short  rta_type;
+};
+
+struct rtgenmsg {
+        unsigned char   rtgen_family;
+};
+
+struct ifinfomsg {
+        unsigned char   ifi_family;
+        unsigned char   __ifi_pad;
+        unsigned short  ifi_type;
+        int             ifi_index;
+        unsigned        ifi_flags;
+        unsigned        ifi_change;
+};
+
+/* linux/if_link.h */
+
+#define IFLA_ADDRESS    1
+#define IFLA_BROADCAST  2
+#define IFLA_IFNAME     3
+#define IFLA_STATS      7
+
+/* linux/if_addr.h */
+
+struct ifaddrmsg {
+        uint8_t         ifa_family;
+        uint8_t         ifa_prefixlen;
+        uint8_t         ifa_flags;
+        uint8_t         ifa_scope;
+        uint32_t        ifa_index;
+};
+
+#define IFA_ADDRESS     1
+#define IFA_LOCAL       2
+#define IFA_LABEL       3
+#define IFA_BROADCAST   4
+
+/* musl */
+
+#define NETLINK_ALIGN(len)      (((len)+3) & ~3)
+#define NLMSG_DATA(nlh)         ((void*)((char*)(nlh)+sizeof(struct nlmsghdr)))
+#define NLMSG_DATALEN(nlh)      ((nlh)->nlmsg_len-sizeof(struct nlmsghdr))
+#define NLMSG_DATAEND(nlh)      ((char*)(nlh)+(nlh)->nlmsg_len)
+#define NLMSG_NEXT(nlh)         (struct nlmsghdr*)((char*)(nlh)+NETLINK_ALIGN((nlh)->nlmsg_len))
+#define NLMSG_OK(nlh,end)       ((char*)(end)-(char*)(nlh) >= sizeof(struct nlmsghdr))
+
+#define RTA_DATA(rta)           ((void*)((char*)(rta)+sizeof(struct rtattr)))
+#define RTA_DATALEN(rta)        ((rta)->rta_len-sizeof(struct rtattr))
+#define RTA_DATAEND(rta)        ((char*)(rta)+(rta)->rta_len)
+#define RTA_NEXT(rta)           (struct rtattr*)((char*)(rta)+NETLINK_ALIGN((rta)->rta_len))
+#define RTA_OK(nlh,end)         ((char*)(end)-(char*)(rta) >= sizeof(struct rtattr))
+
+#define NLMSG_RTA(nlh,len)      ((void*)((char*)(nlh)+sizeof(struct nlmsghdr)+NETLINK_ALIGN(len)))
+#define NLMSG_RTAOK(rta,nlh)    RTA_OK(rta,NLMSG_DATAEND(nlh))
+
+int __rtnetlink_enumerate(int link_af, int addr_af, int (*cb)(void *ctx, struct nlmsghdr *h), void *ctx);