recursive_key_scan(3) — Linux manual page

RECURSIVE_KEY_SCAN(3)    Linux Key Utility Calls   RECURSIVE_KEY_SCAN(3)

NAME

       recursive_key_scan, recursive_session_key_scan - apply a function
       to all keys in a keyring tree

SYNOPSIS

       #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);

DESCRIPTION

       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.

RETURN VALUE

       These functions return the sum of the results of the callback
       functions they invoke.

ERRORS

       Ignored.

LINKING

       When linking, -lkeyutils should be specified to the linker.

SEE ALSO

       keyctl(3), keyctl_describe_alloc(3), keyrings(7)

COLOPHON

       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 man-pages@man7.org] If you have a
       bug report for this manual page, send it to
       keyrings@linux-nfs.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 2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2023-03-20.)  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 man-pages@man7.org

Linux                          10 Mar 2011         RECURSIVE_KEY_SCAN(3)

Pages that refer to this page: keyctl(2), keyctl(3)

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