DBENV->set_func_unmap |
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#include <db.h>int DBENV->set_func_unmap(DB_ENV *dbenv, int (*func_unmap)(void *addr, size_t len));
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 DBENV->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 DBENV->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 DBENV->set_func_unmap interface affects the entire application, not only the environment in which it is called.
The DBENV->set_func_unmap interface may only be used to configure Berkeley DB before the DBENV->open interface is called.
The DBENV->set_func_unmap function returns a non-zero error value on failure and 0 on success.
Called after DBENV->open was called.
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