int sasl_getrealm_t(void *context, int id,
const char **result)
sasl_getrealm_t is used when there is an interaction with SASL_CB_GETREALM as the type.
If a mechanism would use this callback, but it is not present, then the first
realm listed is automatically selected. (Note that a mechanism may still
force the existence of a getrealm callback by SASL_CB_GETREALM to its
context context from the callback record
id callback ID (SASL_CB_GETREALM)
availrealms A string list of the available realms. NULL terminated, may be empty.
result The chosen realm. (a NUL terminated string)