CAP_CLEAR(3)

NAME
cap_clear, cap_get_flag, cap_set_flag - capability data object manipulation

SYNOPSIS
#include <sys/capability.h>

int cap_clear(cap_t cap_p);

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);

USAGE
cc ... -lcap

DESCRIPTION
cap_clear initializes the capability state in working storage identified by cap_p in such a way that all capability flags are cleared.

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 argument, ncap, is used to specify the number of capabilities in the array, caps.

A cap_value_t can identify any capability, such as CAP_CHOWN. A cap_flag_t can be set to CAP_EFFECTIVE, CAP_INHERITABLE or CAP_PERMITTED. A cap_flag_value_t can be CAP_CLEAR (0) or CAP_SET (1).

RETURN VALUE
cap_clear, cap_get_flag and cap_set_flag return zero on success, and -1 on failure.

On failure, errno(3) is set to EINVAL, indicating that one of the arguments is invalid.

CONFORMING TO
These functions are specified by POSIX.1e.

SEE ALSO
cap_copy_ext(3), cap_from_text(3), cap_get_file(3), cap_get_proc(3), cap_init(3)