addr_is_ip4mapped
int addr_is_ip4mapped(struct sockaddr_storage* addr, socklen_t addrlen);
if(errno == EINVAL && addr_is_ip4mapped(
unit_assert(!addr_is_ip4mapped(&a, l));
unit_assert(!addr_is_ip4mapped(&a, l));
unit_assert(!addr_is_ip4mapped(&a, l));
unit_assert(!addr_is_ip4mapped(&a, l));
unit_assert(!addr_is_ip4mapped(&a, l));
unit_assert(addr_is_ip4mapped(&a, l));
unit_assert(addr_is_ip4mapped(&a, l));
unit_assert(addr_is_ip4mapped(&a, l));
unit_assert(!addr_is_ip4mapped(&a, l));
int addr_is_ip4mapped(struct sockaddr_storage* addr, socklen_t addrlen);
if(errno == EINVAL && addr_is_ip4mapped(