avc_netlink_acquire_fd man page on Oracle

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avc_netlink_loop(3)	   SELinux API documentation	   avc_netlink_loop(3)

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

       #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);

       These  functions	 enable applications to handle notification of SELinux
       events via netlink.  The userspace AVC normally checks for netlink mes‐
       sages  on each call to avc_has_perm(3).	Applications may wish to over‐
       ride 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  notifica‐
       tions.	  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 auto‐
       matically on calls to avc_has_perm(3).

       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

       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.

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

       avc_open(3), selinux_set_callback(3), selinux(8)

				  30 Mar 2009		   avc_netlink_loop(3)

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