CAP_INIT
NAME
cap_init, cap_free, cap_dup - capability data object storage management
SYNOPSIS
#include <sys/capability.h>
cap_t cap_init(void);
I int cap_free(void * obj_d );
I cap_t cap_dup(cap_t cap_p );
USAGE
cc ... -lcap
DESCRIPTION
The capabilities associated with a file or process are never edited
directly. Instead, working storage is allocated to contain a
representation of the capability state. Capabilities are edited and
manipulated only within this working storage area. Once editing of
the capability state is complete, the updated capability state is used
to replace the capability state associated with the file or process.
cap_init
creates a capability state in working storage and return a pointer to
the capability state. The initial value of all flags are cleared. 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_free
liberates any releasable memory that has been allocated to the
capability state identified by
R obj_d .
The
obj_d
argument may identify either a
cap_t
entity, or a
char *
entity allocated by the
cap_to_text
function.
cap_dup
returns a duplicate capability state in working storage given by the
source object
R cap_p ,
allocating any memory necessary, and returning a
pointer to the newly created capability state. Once duplicated, no
operation on either capability state affects the other in any way.
RETURN VALUE
cap_init
and
cap_dup
return a non-NULL value on success, and NULL on failure.
cap_free
returns zero on success, and -1 on failure.
On failure,
errno(3)
is set to
R EINVAL ,
or
R ENOMEM .
CONFORMING TO
These functions are specified by POSIX.1e.
SEE ALSO
R cap_clear (3),
R cap_copy_ext (3),
R cap_from_text (3),
R cap_get_file (3),
R cap_get_proc (3)
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