gpg: Avoid multiple open calls to the keybox file.
* g10/keydb.h (KEYDB_HANDLE): Move typedef to ... * g10/gpg.h: here. (struct server_control_s): Add field 'cached_getkey_kdb'. * g10/gpg.c (gpg_deinit_default_ctrl): Release that keydb handle. * g10/getkey.c (getkey_end): Cache keydb handle. (get_pubkey): Use cached keydb handle. * kbx/keybox-search.c (keybox_search_reset): Use lseek instead of closing the file.
Before this patch a "gpg --check-sigs" opened and closed the keybox
file for almost every signature check. By caching the keydb handle
and using lseek(2) this can be limited to just 2 times. This might
speed up things on Windows.
- Signed-off-by: Werner Koch <wk@gnupg.org>