musl/src/network/gethostbyname_r.c

#define _GNU_SOURCE

#include <sys/socket.h>
#include <netdb.h>

int gethostbyname_r(const char *name,
	struct hostent *h, char *buf, size_t buflen,
	struct hostent **res, int *err)
{
	return gethostbyname2_r(name, AF_INET, h, buf, buflen, res, err);
}