KEYCTL_GET_KEYRING_ID(2const) - Linux manual page (original) (raw)

KEYCTLGETKEYRINGID(2const) KEYCTLGETKEYRINGID(2const)

NAME top

   KEYCTL_GET_KEYRING_ID - map a special key ID to a real key ID for
   this process

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#include <linux/keyctl.h>** /* Definition of **KEY*** constants */
   **#include <sys/syscall.h>** /* Definition of **SYS_*** constants */
   **#include <unistd.h>**

   **long syscall(SYS_keyctl, KEYCTL_GET_KEYRING_ID, key_serial_t** _key_**,**
                **int** _arg3_**);**

DESCRIPTION top

   Map a special key ID to a real key ID for this process.

   This operation looks up the special key whose ID is provided in
   _key_.  If the special key is found, the ID of the corresponding
   real key is returned as the function result.  The following values
   may be specified in _key_:

   **KEY_SPEC_THREAD_KEYRING**
          This specifies the calling thread's thread-specific
          keyring.  See [thread-keyring(7)](../man7/thread-keyring.7.html).

   **KEY_SPEC_PROCESS_KEYRING**
          This specifies the caller's process-specific keyring.  See
          [process-keyring(7)](../man7/process-keyring.7.html).

   **KEY_SPEC_SESSION_KEYRING**
          This specifies the caller's session-specific keyring.  See
          [session-keyring(7)](../man7/session-keyring.7.html).

   **KEY_SPEC_USER_KEYRING**
          This specifies the caller's UID-specific keyring.  See
          [user-keyring(7)](../man7/user-keyring.7.html).

   **KEY_SPEC_USER_SESSION_KEYRING**
          This specifies the caller's UID-session keyring.  See
          [user-session-keyring(7)](../man7/user-session-keyring.7.html).

   **KEY_SPEC_REQKEY_AUTH_KEY** (since Linux 2.6.16)
          This specifies the authorization key created by
          [request_key(2)](../man2/request%5Fkey.2.html) and passed to the process it spawns to
          generate a key.  This key is available only in a
          [request-key(8)](../man8/request-key.8.html)-style program that was passed an
          authorization key by the kernel and ceases to be available
          once the requested key has been instantiated; see
          [request_key(2)](../man2/request%5Fkey.2.html).

   **KEY_SPEC_REQUESTOR_KEYRING** (since Linux 2.6.29)
          This specifies the key ID for the [request_key(2)](../man2/request%5Fkey.2.html)
          destination keyring.  This keyring is available only in a
          [request-key(8)](../man8/request-key.8.html)-style program that was passed an
          authorization key by the kernel and ceases to be available
          once the requested key has been instantiated; see
          [request_key(2)](../man2/request%5Fkey.2.html).

   The behavior if the key specified in _key_ does not exist depends on
   the value of _arg3_.  If _arg3_ contains a nonzero value, then —if it
   is appropriate to do so (e.g., when looking up the user, user-
   session, or session key)— a new key is created and its real key ID
   returned as the function result.  Otherwise, the operation fails
   with the error **ENOKEY**.

   If a valid key ID is specified in _key_, and the key exists, then
   this operation simply returns the key ID.  If the key does not
   exist, the call fails with error **ENOKEY**.

   The caller must have _search_ permission on a keyring in order for
   it to be found.

RETURN VALUE top

   On success, the ID of the requested keyring.

   On error, -1 is returned, and _[errno](../man3/errno.3.html)_ is set to indicate the error.

ERRORS top

   **ENOKEY** The key specified in _key_ did not exist, and _arg3_ was zero
          (meaning don't create the key if it didn't exist).

VERSIONS top

   A wrapper is provided in the _libkeyutils_ library:
   [keyctl_get_keyring_ID(3)](../man3/keyctl%5Fget%5Fkeyring%5FID.3.html).

STANDARDS top

   Linux.

HISTORY top

   Linux 2.6.10.

SEE ALSO top

   [keyctl(2)](../man2/keyctl.2.html), [keyctl_get_keyring_ID(3)](../man3/keyctl%5Fget%5Fkeyring%5FID.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-08-21 KEYCTLGETKEYRINGID(2const)

Pages that refer to this page:keyctl(2), KEYCTL_READ(2const), KEYCTL_SEARCH(2const), KEYCTL_SETPERM(2const)