KEYCTL\_SET\_TIMEOUT(3) Linux Key Management Calls KEYCTL\_SET\_TIMEOUT(3) # [NAME](#NAME) keyctl\_set\_timeout - set the expiration timer on a key # [SYNOPSIS](#SYNOPSIS) ``` #include long keyctl_set_timeout(key_serial_t key, unsigned timeout); ``` # [DESCRIPTION](#DESCRIPTION) **keyctl\_set\_timeout**() sets the expiration timer on a key to *timeout* seconds into the future. Setting *timeout* to **zero** cancels the expiration, assuming the key hasn't already expired. When the key expires, further attempts to access it will be met with error **EKEYEXPIRED**. The caller must have **setattr** permission on a key to be able to change its permissions mask. # [RETURN VALUE](#RETURN_VALUE) On success **keyctl\_set\_timeout**() returns **0 .** On error, the value **-1** will be returned and *errno* will have been set to an appropriate error. # [ERRORS](#ERRORS) [**ENOKEY**](#ENOKEY) The specified key does not exist. [**EKEYEXPIRED**](#EKEYEXPIRED) The specified key has already expired. [**EKEYREVOKED**](#EKEYREVOKED) The specified key has been revoked. [**EACCES**](#EACCES) The named key exists, but does not grant **setattr** permission to the calling process. # [LINKING](#LINKING) This is a library function that can be found in *libkeyutils*. When linking, **-lkeyutils** should be specified to the linker. # [SEE ALSO](#SEE_ALSO) [**keyctl**(1)](/man/os/keyutils/keyctl.1), [**add\_key**(2)](/man/os/keyutils/add_key.2), [**keyctl**(2)](/man/os/keyutils/keyctl.2), [**request\_key**(2)](/man/os/keyutils/request_key.2), [**keyctl**(3)](/man/os/keyutils/keyctl.3), [**keyrings**(7)](/man/os/keyutils/keyrings.7), [**keyutils**(7)](/man/os/keyutils/keyutils.7) 4 May 2006 Linux --- Document: keyctl_set_timeout(3) from keyutils 1.6.3-r41 (Chainguard OS) Source: https://kernel.googlesource.com/pub/scm/linux/kernel/git/dhowells/keyutils.git