Berkeley DB: db_env_set_func_file

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Berkeley DB: db_env_set_func_file_map

db_env_set_func_file_map

#include <db.h> int db_env_set_func_file_map(int (*func_file_map)(DB_ENV *dbenv, char *path, size_t len, int is_rdonly, void **addr), int (*func_file_unmap)(DB_ENV *dbenv, void *addr)); Description: db_env_set_func_file_map The Berkeley DB library optionally uses the ability to map a file into memory. The db_env_set_func_file_map method configures all operations performed by a process and all of its threads of control, not operations confined to a single database environment. Although the db_env_set_func_file_map method may be called at any time during the life of the application, it should normally be called before making calls to the db_env_create or db_create methods. The db_env_set_func_file_map method returns a non-zero error value on failure and 0 on success. Parameters func_file_mapThe func_file_map parameter is the function which maps a file into memory. The function takes 5 parameters: dbenvThe dbenv parameter is the enclosing database environment handle. pathThe path parameter is the name of file. Repeated requests for the mapping of the same name should return a reference to the same memory. lenThe len parameter is the length, in bytes, of the file. is_rdonlyThe is_rdonly parameter will be non-zero if the mapped file is read-only. addrThe addr parameter is the memory location into which a pointer to the mapped file is returned. The func_file_map function must return the value of errno on failure and 0 on success. func_file_unmapThe func_file_unmap parameter is the function which unmaps a file from memory. The function takes 2 parameters: dbenvThe dbenv parameter is the enclosing database environment handle. addrThe addr parameter is the value returned by the func_file_map function when the file or region was mapped into memory. The func_file_unmap function must return the value of errno on failure and 0 on success. See Also Run-time configuration