Berkeley DB

db_env_set_func_map

						#include <db.h>
						int
						db_env_set_func_map(int (*func_map)(char *path,
						size_t len, int is_region, int is_rdonly, void **addr));
					

Description

The Berkeley DB library requires the ability to map a file into memory and to create shared memory regions (which may or may not be backed by files). The func_map argument must conform to the following interface:

int map(char *path, size_t len, 
int is_region, int is_rdonly, void **addr); 

The path argument is the name of a file.

The is_region argument will be zero if the intention is to map a file into shared memory. In this case, the map function must map the first len bytes of the file into memory and return a pointer to the mapped location in the memory location referenced by the ...