искать связку ключей для ключа (search a keyring for a key)
Имя (Name)
keyctl_search - search a keyring for a key
Синопсис (Synopsis)
#include <keyutils.h>
long keyctl_search(key_serial_t keyring, const char *type,
const char *description, key_serial_t destination);
Описание (Description)
keyctl_search() recursively searches the keyring for a key of the
specified type and description.
If found, the key will be attached to the destination keyring (if
given), and its serial number will be returned.
The source keyring must grant search permission to the caller,
and for a key to be found, it must also grant search permission
to the caller. Child keyrings will be only be recursively
searched if they grant search permission to the caller as well.
If the destination keyring is zero, no attempt will be made to
forge a link to the key, and just the serial number will be
returned.
If the destination keyring is given, then the link may only be
formed if the found key grants the caller link permission and the
destination keyring grants the caller write permission.
If the search is successful, and if the destination keyring
already contains a link to a key that matches the specified type
and description, then that link will be replaced by a link to the
found key.
The source keyring and destination keyring serial numbers may be
those of valid keyrings to which the caller has appropriate
permission, or they may be special keyring IDs:
KEY_SPEC_THREAD_KEYRING
This specifies the caller's thread-specific keyring.
KEY_SPEC_PROCESS_KEYRING
This specifies the caller's process-specific keyring.
KEY_SPEC_SESSION_KEYRING
This specifies the caller's session-specific keyring.
KEY_SPEC_USER_KEYRING
This specifies the caller's UID-specific keyring.
KEY_SPEC_USER_SESSION_KEYRING
This specifies the caller's UID-session keyring.
Возвращаемое значение (Return value)
On success keyctl_search() 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.
Ошибки (Error)
ENOKEY One of the keyrings doesn't exist, no key was found by the
search, or the only key found by the search was a negative
key.
ENOTDIR
One of the keyrings is a valid key that isn't a keyring.
EKEYEXPIRED
One of the keyrings has expired, or the only key found was
expired.
EKEYREVOKED
One of the keyrings has been revoked, or the only key
found was revoked.
ENOMEM Insufficient memory to expand the destination keyring.
EDQUOT The key quota for this user would be exceeded by creating
a link to the found key in the destination keyring.
EACCES The source keyring didn't grant search permission, the
destination keyring didn't grant write permission or the
found key didn't grant link permission to the caller.
Ссылки (Linking)
Although this is a Linux system call, it is not present in libc
but can be found rather in libkeyutils. When linking, -lkeyutils
should be specified to the linker.
Смотри также (See also)
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
keyrings(7), keyutils(7)
