Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #540
Difficulty: Medium
In dynamically typed programming languages. instead of declaring a variable to have a particular type, the type of a variable is determined by an A.I. in the operating system.
True or False?
Linux & Unix Commands - Search Man Pages

keyctl_search(3) [suse man page]

KEYCTL_SEARCH(3)					    Linux Key Management Calls						  KEYCTL_SEARCH(3)

NAME
keyctl_search - Search a keyring for a key SYNOPSIS
#include <keyutils.h> long keyctl_search(key_serial_t keyring, const char *type, const char *description, key_serial_t destination); 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 call- er. 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 destina- tion 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 descrip- tion, 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. 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. ERRORS
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. 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), 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_link(3), keyctl_unlink(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_SEARCH(3)

Check Out this Related 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