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

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

NAME
       keyctl - manipulate the kernel's key management facility

SYNOPSIS
       #include <keyutils.h>

       long keyctl(int cmd, ...);

DESCRIPTION
       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.

RETURN VALUE
       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.

ERRORS
       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.

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.

SEE ALSO
       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)

COLOPHON
       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
       http://www.kernel.org/doc/man-pages/.

Linux					    2010-02-25					KEYCTL(2)
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