DBENV->set_func_unmap

APIRef

#include <db.h>

int DBENV->set_func_unmap(DB_ENV *dbenv, 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 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.

Errors

EINVAL
An invalid flag value or parameter was specified.

Called after DBENV->open was called.

See Also

DBENV->set_func_close, DBENV->set_func_dirfree, DBENV->set_func_dirlist, DBENV->set_func_exists, DBENV->set_func_free, DBENV->set_func_fsync, DBENV->set_func_ioinfo, DBENV->set_func_malloc, DBENV->set_func_map, DBENV->set_func_open, DBENV->set_func_read, DBENV->set_func_realloc, DBENV->set_func_seek, DBENV->set_func_sleep, DBENV->set_func_unlink, DBENV->set_func_unmap, DBENV->set_func_write and DBENV->set_func_yield.

APIRef

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