int
db_env_set_func_unmap(int (*func_unmap)(void *addr, size_t len));
Description
The Berkeley DB library requires the ability to unmap a file or shared memory
region from memory. The func_unmap argument must conform to the
following interface:
int unmap(void *addr, size_t len);
The addr argument is the argument returned by the
db_env_set_func_map function when the file or region was mapped
into memory, and the len argument is the same as the len
argument specified to the db_env_set_func_map function when the
file or region was mapped into memory.
The func_unmap function must return the value of errno on
failure and 0 on success.
The db_env_set_func_unmap interface affects the entire application, not a single
database or database environment.
While the db_env_set_func_unmap interface may be used to configure Berkeley DB at any time
during the life of the application, it should normally be called before
making any calls to the db_env_create or db_create functions.
The db_env_set_func_unmap function returns a non-zero error value on failure and 0 on success.