CAP_CLEAR(3) Linux Programmer's Manual CAP_CLEAR(3)NAME
cap_clear, cap_get_flag, cap_set_flag - capability data object manipu‐
lation
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, cap_value_t
*caps, cap_flag_value_t value);
USAGE
cc ... -lcap
DESCRIPTION
cap_clear initializes the capability state in working storage identi‐
fied 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_PERMIT‐
TED. 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 argu‐
ments is invalid.
CONFORMING TO
These functions are specified by POSIX.1e.
SEE ALSOcap_copy_ext(3), cap_from_text(3), cap_get_file(3), cap_get_proc(3),
cap_init(3)
26th May 1997 CAP_CLEAR(3)
