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

fusl/src/network/getaddrinfo.c

+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <string.h>
+#include "lookup.h"
+
+int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
+{
+        struct service ports[MAXSERVS];
+        struct address addrs[MAXADDRS];
+        char canon[256], *outcanon;
+        int nservs, naddrs, nais, canon_len, i, j, k;
+        int family = AF_UNSPEC, flags = 0, proto = 0, socktype = 0;
+        struct aibuf {
+                struct addrinfo ai;
+                union sa {
+                        struct sockaddr_in sin;
+                        struct sockaddr_in6 sin6;
+                } sa;
+        } *out;
+
+        if (!host && !serv) return EAI_NONAME;
+
+        if (hint) {
+                family = hint->ai_family;
+                flags = hint->ai_flags;
+                proto = hint->ai_protocol;
+                socktype = hint->ai_socktype;
+
+                const int mask = AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST |
+                        AI_V4MAPPED | AI_ALL | AI_ADDRCONFIG | AI_NUMERICSERV;
+                if ((flags & mask) != flags)
+                        return EAI_BADFLAGS;
+
+                switch (family) {
+                case AF_INET:
+                case AF_INET6:
+                case AF_UNSPEC:
+                        break;
+                default:
+                        return EAI_FAMILY;
+                }
+        }
+
+        nservs = __lookup_serv(ports, serv, proto, socktype, flags);
+        if (nservs < 0) return nservs;
+
+        naddrs = __lookup_name(addrs, canon, host, family, flags);
+        if (naddrs < 0) return naddrs;
+
+        nais = nservs * naddrs;
+        canon_len = strlen(canon);
+        out = calloc(1, nais * sizeof(*out) + canon_len + 1);
+        if (!out) return EAI_MEMORY;
+
+        if (canon_len) {
+                outcanon = (void *)&out[nais];
+                memcpy(outcanon, canon, canon_len+1);
+        } else {
+                outcanon = 0;
+        }
+
+        for (k=i=0; i<naddrs; i++) for (j=0; j<nservs; j++, k++) {
+                out[k].ai = (struct addrinfo){
+                        .ai_family = addrs[i].family,
+                        .ai_socktype = ports[j].socktype,
+                        .ai_protocol = ports[j].proto,
+                        .ai_addrlen = addrs[i].family == AF_INET
+                                ? sizeof(struct sockaddr_in)
+                                : sizeof(struct sockaddr_in6),
+                        .ai_addr = (void *)&out[k].sa,
+                        .ai_canonname = outcanon,
+                        .ai_next = &out[k+1].ai };
+                switch (addrs[i].family) {
+                case AF_INET:
+                        out[k].sa.sin.sin_family = AF_INET;
+                        out[k].sa.sin.sin_port = htons(ports[j].port);
+                        memcpy(&out[k].sa.sin.sin_addr, &addrs[i].addr, 4);
+                        break;
+                case AF_INET6:
+                        out[k].sa.sin6.sin6_family = AF_INET6;
+                        out[k].sa.sin6.sin6_port = htons(ports[j].port);
+                        out[k].sa.sin6.sin6_scope_id = addrs[i].scopeid;
+                        memcpy(&out[k].sa.sin6.sin6_addr, &addrs[i].addr, 16);
+                        break;                  
+                }
+        }
+        out[nais-1].ai.ai_next = 0;
+        *res = &out->ai;
+        return 0;
+}