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CentOS 7.0 - man page for cap_copy_int (centos section 3)

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

       cap_copy_ext,  cap_size,  cap_copy_int - capability state external representation transla-

       #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 representa-
       tion of a capability state in user-managed space.  The internal representation is  managed
       by the capability functions in working storage.

       cap_size()  returns the total length (in bytes) that the capability state in working stor-
       age identified by cap_p would require when converted 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 necessary
       to convert the capability state from the undefined internal format to an exportable,  con-
       tiguous,  persistent data record.  It is the responsibility of the user to allocate a buf-
       fer 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, persis-
       tent 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 successfully.  The
       caller should free any releasable memory, when the capability 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 specification.

       libcap(3), cap_clear(3), cap_from_text(3), cap_get_file(3), cap_get_proc(3),  cap_init(3),

					    2008-05-11				  CAP_COPY_EXT(3)

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