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    Command:

    cap_size

    
    
    
    

    SYNOPSIS

           #include <sys/capability.h>
    
           ssize_t cap_size(cap_t cap_p);
    
           ssize_t cap_copy_ext(void *ext_p, cap_t cap_p, ssize_t size);
    
           cap_t cap_copy_int(const void *ext_p);
    
           Link with -lcap.
    
    
    

    DESCRIPTION

           These functions translate between internal and external representations
           of  a  capability state.  The external representation is an exportable,
           contiguous, persistent representation of a capability  state  in  user-
           managed  space.  The internal representation is managed by the capabil-
           ity functions in working storage.
    
           cap_size() returns the total length  (in  bytes)  that  the  capability
           state  in  working  storage identified by cap_p would require when con-
           verted by cap_copy_ext().  This function is used primarily to determine
           the  amount of buffer space that must be provided to the cap_copy_ext()
           function in order to hold  the  capability  data  record  created  from
           cap_p.
    
           cap_copy_ext() copies a capability state in working storage, identified
           by cap_p, from system managed space to user-managed space  (pointed  to
           by  ext_p)  and  returns  the length of the resulting data record.  The
           size parameter represents the maximum size, in bytes, of the  resulting
           data  record.  The cap_copy_ext() function will do any conversions nec-
           essary to convert the capability state from the undefined internal for-
           mat  to  an  exportable, contiguous, persistent data record.  It is the
           responsibility of the user to allocate a buffer large  enough  to  hold
           the  copied  data.   The buffer length required to hold the copied data
           may be obtained by a call to the cap_size() function.
    
           cap_copy_int() copies a capability state from a capability data  record
           in  user-managed  space  to  a new capability state in working storage,
           allocating any memory necessary, and returning a pointer to  the  newly
           created  capability  state.   The  function  initializes the capability
           state and then copies the capability state from the record  pointed  to
           by  ext_p into the capability state, converting, if necessary, the data
           from a contiguous, persistent format to an undefined, internal  format.
           Once  copied into internal format, the object can be manipulated by the
           capability state manipulation functions (see cap_clear(3)).  Note  that
           the record pointed to by ext_p must have been obtained from a previous,
           successful call to cap_copy_ext() for this function  to  work  success-
           fully.  The caller should free any releasable memory, when the capabil-
           ity state  in  working  storage  is  no  longer  required,  by  calling
           cap_free() with the cap_t as an argument.
    
           cation.
    
    
    

    SEE ALSO

           libcap(3),     cap_clear(3),     cap_from_text(3),     cap_get_file(3),
           cap_get_proc(3), cap_init(3), capabilities(7)
    
                                      2008-05-11                   CAP_COPY_EXT(3)
    
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