KEYCTL_SET_TIMEOUT
Sets or clears the expiration timer on a key. Arguments
ecx | Key serial number.
edx | Timeout (in seconds) to set. If this values is null the the timeout is cleared. When the key expires, further attempts to access it will be met with error EKEYEXPIRED.
Return values If the system call succeeds the return value is 0. If the system call fails the return value is one of the following errno values:
`-ENOKEY` | `No matching key was found.`
`-EKEYEXPIRED` | `The keyring specified has expired.`
`-EKEYREVOKED` | `The keyring specified had been revoked.`
`-EACCES` | `The named key exists, but does not grant setattr permission to the calling process.`
Remarks The process must have attribute modification access on a key to set its timeout. Timeouts may not be set with this function on negative, revoked or expired keys.