内容简介
#include <keyutils.h> long keyctl(int cmd, ...); |
描述
keyctl() 有许多功能可用：| 标签 | 描述 |
|---|---|
| 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. | |
返回值
On success keyctl() returns the serial number of the key it found. On error, the value -1will be returned and errno will have been set to an appropriate error.错误
| 标签 | 描述 |
|---|---|
| ENOKEY | No matching key was found or an invalid key was specified. |
| EKEYEXPIRED | |
| An expired key was found or specified. | |
| EKEYREVOKED | |
| A revoked key was found or specified. | |
| EKEYREJECTED | |
| A rejected key was found or specified. | |
| EDQUOT | The key quota for the caller’s user would be exceeded by creating a key or linking it to the keyring. |
| EACCES | A key operation wasn’t permitted. |
LINKING
Although this is a Linux system call, it is not present in libc but can be found rather inlibkeyutils. When linking, -lkeyutils should be specified to the linker.另请参阅
add_key(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_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)
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