mongoc_host_list_t(3) on Linux
The text 3cdcd1421d12, as Debian 9 (Stretch) shipped it.
typedef struct { mongoc_host_list_t *next; char host [BSON_HOST_NAME_MAX + 1]; char host_and_port [BSON_HOST_NAME_MAX + 7]; uint16_t port; int family; void *padding [4]; } mongoc_host_list_t;