avc_netlink_open man page on Scientific

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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 automati‐
       cally 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 block.

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

       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.

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

				  30 Mar 2009		   avc_netlink_loop(3)

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