Manual Reference Pages  - KEYCTL_UPDATE (3)

NAME

keyctl_update - Update a key

CONTENTS

Synopsis
Description
Return Value
Errors
Linking
See Also

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  The key specified had been revoked.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_get_keyring_ID(3),
keyctl_join_session_keyring(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)


Linux KEYCTL_UPDATE (3) 4 May 2006
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