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key_serial_t keyctl_get_keyring_ID(key_serial_t key,
keyctl_get_keyring_ID() maps a special key or keyring ID to the serial
number of the key actually representing that feature. The serial num-
ber will be returned if that key exists.
If the key or keyring does not yet exist, then if create is non-zero,
the key or keyring will be created if it is appropriate to do so.
The following special key IDs may be specified as key:
This specifies the caller's thread-specific keyring.
This specifies the caller's process-specific keyring.
This specifies the caller's session-specific keyring.
This specifies the caller's UID-specific keyring.
This specifies the caller's UID-session keyring.
This specifies the authorisation key created by request_key()
and passed to the process it spawns to generate a key.
If a valid keyring ID is passed in, then this will simply be returned
if the key exists; an error will be issued if it doesn't exist.
On success keyctl_get_keyring_ID() returns the serial number of the key
it found. On error, the value -1 will be returned and errno will have
been set to an appropriate error.
ENOKEY No matching key was found.
ENOMEM Insufficient memory to create a key.
EDQUOT The key quota for this user would be exceeded by creating this
key or linking it to the keyring.