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CAP_COPY_EXT(3)		   Linux Programmer's Manual	       CAP_COPY_EXT(3)

       cap_copy_ext, cap_size, cap_copy_int - capability state external repre‐
       sentation translation

       #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.

       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_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.

       cap_size() returns the length required to hold a capability data record
       on success, and -1 on failure.

       cap_copy_ext() returns the number of bytes placed in the	 user  managed
       space pointed to by ext_p on success, and -1 on failure.

       cap_copy_int()  returns a pointer to the newly created capability state
       in working storage on success, and NULL on failure.

       On failure, errno is set to EINVAL, ENOMEM, or ERANGE.

       These functions are specified in the withdrawn POSIX.1e draft  specifi‐

       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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