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KEYCTL_UPDATE(3)          Linux Key Management Calls          KEYCTL_UPDATE(3)



NAME
       keyctl_update - Update a key

SYNOPSIS
       #include <keyutils.h>

       long keyctl_update(key_serial_t key, const char *payload,
       size_t plen);

DESCRIPTION
       keyctl_update() updates the payload of a key if the key type permits it.

       The caller must have write permission on a key to be able update it.

       payload  and  plen  specify  the data for the new payload.  payload may be NULL and plen may be zero if the key
       type permits that.  The key type may reject the data if it's in the wrong format or in some other way  invalid.

RETURN VALUE
       On  success keyctl_update() returns 0.  On error, the value -1 will be returned and errno will have been set to
       an appropriate error.

ERRORS
       ENOKEY The key specified is invalid.

       EKEYEXPIRED
              The key specified has expired.

       EKEYREVOKED
              The key specified had been revoked.

       EINVAL The payload data was invalid.

       ENOMEM Insufficient memory to store the new payload.

       EDQUOT The key quota for this user would be exceeded by increasing the size of the key to accommodate  the  new
              payload.

       EACCES The key exists, but is not writable by the calling process.

       EOPNOTSUPP
              The key type does not support the update operation on its keys.

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(3),
       request-key(8)



Linux                             4 May 2006                  KEYCTL_UPDATE(3)