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selabel_open(3) SELinux API documentation selabel_open(3)


selabel_open, selabel_close - userspace SELinux labeling interface


#include <selinux/selinux.h>
#include <selinux/label.h>

struct selabel_handle *selabel_open(int backend,
const struct selinux_opt *options,
unsigned nopt);

void selabel_close(struct selabel_handle *hnd);


selabel_open() is used to initialize a labeling handle to be used for lookup operations. The backend argument specifies which backend is to be opened; the list of current backends appears in BACKENDS below.

The options argument should be NULL or a pointer to an array of selinux_opt structures of length nopt:

struct selinux_opt {
	int	type;
	const char	*value;

The available option types are described in GLOBAL OPTIONS below as well as in the documentation for each individual backend. The return value on success is a non-NULL value for use in subsequent label operations.

selabel_close() terminates use of a handle, freeing any internal resources associated with it. After this call has been made, the handle must not be used again.


Global options which may be passed to selabel_open() include the following:

The option with a type code of zero is a no-op. Thus an array of options may be initizalized to zero and any untouched elements will not cause an error.
A non-null value for this option enables context validation. By default, security_check_context(3) is used; a custom validation function can be provided via selinux_set_callback(3). Note that an invalid context may not be treated as an error unless it is actually encountered during a lookup operation.
A non-null value for this option enables the generation of an SHA1 digest of the spec files loaded as described in selabel_digest(3)


File contexts backend, described in selabel_file(5).
Media contexts backend, described in selabel_media(5).
X Windows contexts backend, described in selabel_x(5).
Database objects contexts backend, described in selabel_db(5).


A non-NULL handle value is returned on success. On error, NULL is returned and errno is set appropriately.


Eamon Walsh <>


selabel_lookup(3), selabel_stats(3), selinux_set_callback(3), selinux(8)

18 Jun 2007