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   avc_netlink_open    ( 3 )

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Имя (Name)

avc_netlink_open, avc_netlink_close, avc_netlink_acquire_fd,
       avc_netlink_release_fd, avc_netlink_check_nb, avc_netlink_loop -
       SELinux netlink processing

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Синопсис (Synopsis)

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

       int avc_netlink_open(int blocking);

       void avc_netlink_close(void);

       int avc_netlink_acquire_fd(void);

       void avc_netlink_release_fd(void);

       void avc_netlink_loop(void);

       int avc_netlink_check_nb(void);

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Описание (Description)

These functions enable applications to handle notification of
       SELinux events via netlink.  The userspace AVC normally checks
       for netlink messages on each call to avc_has_perm(3).
       Applications may wish to override this behavior and check for
       notification separately, for example in a select(2) loop.  These
       functions also permit netlink monitoring without requiring a call
       to avc_open(3).

       avc_netlink_open() opens a netlink socket to receive SELinux
       notifications.  The socket descriptor is stored internally; use
       avc_netlink_acquire_fd(3) to take ownership of it in application
       code.  The blocking argument controls whether the O_NONBLOCK flag
       is set on the socket descriptor.  avc_open(3) calls this function
       internally, specifying non-blocking behavior.

       avc_netlink_close() closes the netlink socket.  This function is
       called automatically by avc_destroy(3).

       avc_netlink_acquire_fd() returns the netlink socket descriptor
       number and informs the userspace AVC not to check the socket
       descriptor automatically on calls to avc_has_perm(3).  If no such
       socket descriptor exists, avc_netlink_acquire_fd(3) will first
       call avc_netlink_open(3) and then return the resulting fd.

       avc_netlink_release_fd() returns control of the netlink socket to
       the userspace AVC, re-enabling automatic processing of
       notifications.

       avc_netlink_check_nb() checks the netlink socket for pending
       messages and processes them.  Callbacks for policyload and
       enforcing changes will be called; see selinux_set_callback(3).
       This function does not block.

       avc_netlink_loop() enters a loop blocking on the netlink socket
       and processing messages as they are received.  This function will
       not return unless an error occurs on the socket, in which case
       the socket is closed.

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Возвращаемое значение (Return value)

avc_netlink_acquire_fd() returns a non-negative file descriptor
       number on success.  Other functions with a return value return
       zero on success.  On error, -1 is returned and errno is set
       appropriately.

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