#include <db.h> int db_env_set_func_write(ssize_t (*func_write)(int fd, const void *buffer, size_t nbytes));
Replace Berkeley DB calls to the IEEE/ANSI Std 1003.1 (POSIX) write function with func_write, which must conform to the standard interface specification.
The db_env_set_func_write()
function 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_write()
function 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_write()
function returns a non-zero error value on failure and 0 on success.