Linux and UNIX Man Pages

Test Your Knowledge in Computers #544
Difficulty: Medium
Using global variables is generally considered a best practice in modern programming languages..
True or False?
Linux & Unix Commands - Search Man Pages

keyctl_link(3) [suse man page]

KEYCTL_LINK(3)						    Linux Key Management Calls						    KEYCTL_LINK(3)

NAME
keyctl_link - Link a key to a keyring keyctl_unlink - Unlink a key from a keyring SYNOPSIS
#include <keyutils.h> long keyctl_link(key_serial_t key, key_serial_t keyring); long keyctl_unlink(key_serial_t key, key_serial_t keyring); DESCRIPTION
keyctl_link() creates a link from keyring to key, displacing any link to another key of the same type and description in that keyring if one exists. keyctl_unlink() removes the link from keyring to key if it exists. The caller must have write permission on a keyring to be able create or remove links in it. The caller must have link permission on a key to be able to create a link to it. RETURN VALUE
On success keyctl_link() and keyctl_unlink() return 0. On error, the value -1 will be returned and errno will have been set to an appro- priate error. ERRORS
ENOKEY The key or the keyring specified are invalid. EKEYEXPIRED The key or the keyring specified have expired. EKEYREVOKED The key or the keyring specified have been revoked. EACCES The keyring exists, but is not writable by the calling process. For keyctl_link() only: ENOMEM Insufficient memory to expand the keyring EDQUOT Expanding the keyring would exceed the keyring owner's quota. EACCES The key exists, but is not linkable by the calling process. LINKING
This is a library function that can be found in libkeyutils. When linking, -lkeyutils should be specified to the linker. SEE ALSO
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl_get_keyring_ID(3), keyctl_join_session_keyring(3), keyctl_update(3), keyctl_revoke(3), keyctl_chown(3), keyctl_setperm(3), keyctl_describe(3), keyctl_clear(3), keyctl_search(3), keyctl_read(3), keyctl_instantiate(3), keyctl_negate(3), keyctl_set_reqkey_keyring(3), keyctl_set_timeout(3), keyctl_assume_authority(3), keyctl_describe_alloc(3), keyctl_read_alloc(3), request-key(8) Linux 4 May 2006 KEYCTL_LINK(3)

Featured Tech Videos