sdt_provider
__link_set_decl(sdt_providers_set, struct sdt_provider);
struct sdt_provider * const * provider;
struct sdt_provider sdt_provider_##prov[1] = { \
extern struct sdt_provider sdt_provider_##prov[1]
struct sdt_provider;
struct sdt_provider *prov; /* Ptr to the provider structure. */
TAILQ_ENTRY(sdt_provider)