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

fusl/src/network/getservbyname_r.c

+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <string.h>
+#include "lookup.h"
+
+#define ALIGN (sizeof(struct { char a; char *b; }) - sizeof(char *))
+
+int getservbyname_r(const char *name, const char *prots,
+        struct servent *se, char *buf, size_t buflen, struct servent **res)
+{
+        struct service servs[MAXSERVS];
+        int cnt, proto, align;
+
+        /* Align buffer */
+        align = -(uintptr_t)buf & ALIGN-1;
+        if (buflen < 2*sizeof(char *)+align)
+                return ERANGE;
+        buf += align;
+
+        if (!prots) proto = 0;
+        else if (!strcmp(prots, "tcp")) proto = IPPROTO_TCP;
+        else if (!strcmp(prots, "udp")) proto = IPPROTO_UDP;
+        else return EINVAL;
+
+        cnt = __lookup_serv(servs, name, proto, 0, 0);
+        if (cnt<0) switch (cnt) {
+        case EAI_MEMORY:
+        case EAI_SYSTEM:
+                return ENOMEM;
+        default:
+                return ENOENT;
+        }
+
+        se->s_name = (char *)name;
+        se->s_aliases = (void *)buf;
+        se->s_aliases[0] = se->s_name;
+        se->s_aliases[1] = 0;
+        se->s_port = htons(servs[0].port);
+        se->s_proto = servs[0].proto == IPPROTO_TCP ? "tcp" : "udp";
+
+        *res = se;
+        return 0;
+}