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CentOS 7.0 - man page for keyctl (centos section 2)

KEYCTL(2)						    Linux Key Management Calls							 KEYCTL(2)

keyctl - manipulate the kernel's key management facility
#include <keyutils.h> long keyctl(int cmd, ...);
keyctl() has a number of functions available: KEYCTL_GET_KEYRING_ID Ask for a keyring's ID. KEYCTL_JOIN_SESSION_KEYRING Join or start named session keyring. KEYCTL_UPDATE Update a key. KEYCTL_REVOKE Revoke a key. KEYCTL_CHOWN Set ownership of a key. KEYCTL_SETPERM Set perms on a key. KEYCTL_DESCRIBE Describe a key. KEYCTL_CLEAR Clear contents of a keyring. KEYCTL_LINK Link a key into a keyring. KEYCTL_UNLINK Unlink a key from a keyring. KEYCTL_SEARCH Search for a key in a keyring. KEYCTL_READ Read a key or keyring's contents. KEYCTL_INSTANTIATE Instantiate a partially constructed key. KEYCTL_NEGATE Negate a partially constructed key. KEYCTL_SET_REQKEY_KEYRING Set default request-key keyring. KEYCTL_SET_TIMEOUT Set timeout on a key. KEYCTL_ASSUME_AUTHORITY Assume authority to instantiate key. These are wrapped by libkeyutils into individual functions to permit compiler the compiler to check types. See the See Also section at the bottom.
On success keyctl() 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.
EACCES A key operation wasn't permitted. EDQUOT The key quota for the caller's user would be exceeded by creating a key or linking it to the keyring. EKEYEXPIRED An expired key was found or specified. EKEYREJECTED A rejected key was found or specified. EKEYREVOKED A revoked key was found or specified. ENOKEY No matching key was found or an invalid key was specified.
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.
keyctl(1), add_key(2), request_key(2), keyctl_set_timeout(3), keyctl_chown(3), keyctl_clear(3), keyctl_describe(3), keyctl_describe_alloc(3), keyctl_get_keyring_ID(3), keyctl_instantiate(3), keyctl_join_session_keyring(3), keyctl_link(3), keyctl_negate(3), keyctl_revoke(3), keyctl_search(3), keyctl_setperm(3), keyctl_set_reqkey_keyring(3), keyctl_set_timeout(3), keyctl_read(3), keyctl_read_alloc(3), keyctl_unlink(3), keyctl_update(3), request-key(8)
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2010-02-25 KEYCTL(2)