RECURSIVE_KEY_SCAN(3) Linux Key Utility Calls RECURSIVE_KEY_SCAN(3)
recursive_key_scan, recursive_session_key_scan - apply a function to all keys in a keyring tree
#include <keyutils.h> typedef int (*recursive_key_scanner_t)(key_serial_t parent, key_serial_t key, char *desc, int desc_len, void *data); long recursive_key_scan(key_serial_t keyring, recursive_key_scanner_t func, void *data); long recursive_session_key_scan(recursive_key_scanner_t func, void *data);
recursive_key_scan() performs a depth-first recursive scan of the specified keyring tree and applies func to every link found in the accessible keyrings in that tree. data is passed to each invocation of func. The return values of func are summed and returned as the overall return value. Errors are ignored. Inaccessible keyrings are not scanned, but links to them are still passed to func. recursive_session_key_scan() works exactly like recursive_key_scan() with the caller's session keyring specified as the starting keyring. The callback function is called for each link found in all the keyrings in the nominated tree and so may be called multiple times for a particular key if that key has multiple links to it. The callback function is passed the following parameters: parent The keyring containing the link or 0 for the initial key. key The key to which the link points. desc and desc_len A pointer to the raw description and its length as retrieved with keyctl_describe_alloc(). These will be NULL and -1 respectively if the description couldn't be retrieved and errno will retain the error from keyctl_describe_alloc(). data The data passed to the scanner function.
These functions return the sum of the results of the callback functions they invoke.
When linking, -lkeyutils should be specified to the linker.
keyctl(3), keyctl_describe_alloc(3), keyrings(7)
This page is part of the keyutils (key management utilities) project. Information about the project can be found at [unknown -- if you know, please contact email@example.com] If you have a bug report for this manual page, send it to firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨http://git.kernel.org/pub/scm/linux/kernel/git/dhowells/keyutils.git⟩ on 2021-04-01. (At that time, the date of the most recent commit that was found in the repository was 2020-07-07.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com Linux 10 Mar 2011 RECURSIVE_KEY_SCAN(3)
Pages that refer to this page: keyctl(2), keyctl(3)