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

       cap_clear,  cap_clear_flag,  cap_get_flag,  cap_set_flag, cap_compare -
       capability data object manipulation

       #include <sys/capability.h>

       int cap_clear(cap_t cap_p);

       int cap_clear_flag(cap_t cap_p, cap_flag_t flag);

       int cap_get_flag(cap_t cap_p, cap_value_t cap,
			cap_flag_t flag, cap_flag_value_t *value_p);

       int cap_set_flag(cap_t cap_p, cap_flag_t flag, int ncap,
			const cap_value_t *caps, cap_flag_value_t value);

       int cap_compare(cap_t cap_a, cap_t cap_b);

       Link with -lcap.

       These functions work on a capability state held in working storage.   A
       cap_t  holds  information  about	 the capabilities in each of the three
       sets, Permitted, Inheritable, and Effective.  Each capability in a  set
       may be clear (disabled, 0) or set (enabled, 1).

       These functions work with the following data types:

       cap_value_t	 identifies a capability, such as CAP_CHOWN.

       cap_flag_t	 identifies  one  of the three flags associated with a
			 capability (i.e., it  identifies  one	of  the	 three
			 capability  sets).   Valid  values  for this type are

       cap_flag_value_t	 identifies the setting	 of  a	particular  capability
			 flag  (i.e,  the  value  of  a	 capability in a set).
			 Valid values for  this	 type  are  CAP_CLEAR  (0)  or
			 CAP_SET (1).

       cap_clear() initializes the capability state in working storage identi‐
       fied by cap_p so that all capability flags are cleared.

       cap_clear_flag() clears all of the capabilities of the specified	 capa‐
       bility flag, flag.

       cap_get_flag()  obtains the current value of the capability flag, flag,
       of the capability, cap, from the capability state identified  by	 cap_p
       and places it in the location pointed to by value_p.

       cap_set_flag()  sets  the  flag,	 flag, of each capability in the array
       caps in the capability state identified by cap_p to value.   The	 argu‐
       ment, ncap, is used to specify the number of capabilities in the array,

       cap_compare() compares two full capability sets and, in the  spirit  of
       memcmp(), returns zero if the two capability sets are identical. A pos‐
       itive return value, status, indicates there  is	a  difference  between
       them.  The  returned  value  carries further information about which of
       three sets, cap_flag_t flag, differ. Specifically, the  macro  CAP_DIF‐
       FERS  (status,  flag) evaluates to non-zero if the returned status dif‐
       fers in its flag components.

       cap_clear(),  cap_clear_flag(),	 cap_get_flag()	  cap_set_flag()   and
       cap_compare()  return  zero on success, and -1 on failure. Other return
       values for cap_compare() are described above.

       On failure, errno is set to EINVAL, indicating that one	of  the	 argu‐
       ments is invalid.

       These  functions are as per the withdrawn POSIX.1e draft specification.
       cap_clear_flag() and cap_compare() are Linux extensions.

       libcap(3),    cap_copy_ext(3),	 cap_from_text(3),    cap_get_file(3),
       cap_get_proc(3), cap_init(3), capabilities(7)

				  2008-05-11			  CAP_CLEAR(3)

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