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    Command:

    add_key

    
    
    

    SYNOPSIS

           #include <keyutils.h>
    
           key_serial_t add_key(const char *type, const char *description,
                                const void *payload, size_t plen,
                                key_serial_t keyring);
    
    
    

    DESCRIPTION

           add_key()  asks  the kernel to create or update a key of the given type
           and description, instantiate it with the payload of length plen, and to
           attach it to the nominated keyring and to return its serial number.
    
           The key type may reject the data if it's in the wrong format or in some
           other way invalid.
    
           If the destination keyring already contains  a  key  that  matches  the
           specified  type and description then, if the key type supports it, that
           key will be updated rather than a new key being created; if not, a  new
           key  will  be  created  and it will displace the link to the extant key
           from the keyring.
    
           The destination keyring serial number may be that of a valid keyring to
           which  the  caller has write permission, or it may be a special keyring
           ID:
    
           KEY_SPEC_THREAD_KEYRING
                  This specifies the caller's thread-specific keyring.
    
           KEY_SPEC_PROCESS_KEYRING
                  This specifies the caller's process-specific keyring.
    
           KEY_SPEC_SESSION_KEYRING
                  This specifies the caller's session-specific keyring.
    
           KEY_SPEC_USER_KEYRING
                  This specifies the caller's UID-specific keyring.
    
           KEY_SPEC_USER_SESSION_KEYRING
                  This specifies the caller's UID-session keyring.
    
    
    

    KEY TYPES

           There are a number of key types available in the  core  key  management
           code, and these can be specified to this function:
    
           "user" Keys  of  the  user-defined key type may contain a blob of arbi-
                  trary data, and the description may be any valid string,  though
                  it  is  preferred that the description be prefixed with a string
                  representing the service to which the key is of interest  and  a
                  colon  (for  instance "afs:mykey").  The payload may be empty or
                  NULL for keys of this type.
    
           "keyring"
                  The keyring has expired.
    
           EKEYREVOKED
                  The keyring has been revoked.
    
           EINVAL The payload data was invalid.
    
           ENOMEM Insufficient memory to create a key.
    
           EDQUOT The  key  quota for this user would be exceeded by creating this
                  key or linking it to the keyring.
    
           EACCES The keyring wasn't available for modification by the user.
    
    
    

    LINKING

           Although this is a Linux system call, it is not present in libc but can
           be  found  rather  in  libkeyutils.  When linking, -lkeyutils should be
           specified to the linker.
    
    
    

    SEE ALSO

           keyctl(1), keyctl(2), request_key(2)
    
    
    

    Linux 2010-02-25 ADD_KEY(2)

    
    
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