Extend kqueue down to the device layer.

Backwards compatible approach suggested by: peter

1 files changed, 28 insertions, 27 deletions

diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index d8a95cf..85667de 100644
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -64,21 +64,18 @@
 static int	 do_setopt_accept_filter(struct socket *so, struct sockopt *sopt);
 #endif
 
-static int 	filt_sorattach(struct knote *kn);
 static void 	filt_sordetach(struct knote *kn);
 static int 	filt_soread(struct knote *kn, long hint);
-static int 	filt_sowattach(struct knote *kn);
 static void 	filt_sowdetach(struct knote *kn);
 static int	filt_sowrite(struct knote *kn, long hint);
 static int	filt_solisten(struct knote *kn, long hint);
 
 static struct filterops solisten_filtops = 
-	{ 1, filt_sorattach, filt_sordetach, filt_solisten };
-
-struct filterops so_rwfiltops[] = {
-	{ 1, filt_sorattach, filt_sordetach, filt_soread },
-	{ 1, filt_sowattach, filt_sowdetach, filt_sowrite },
-};
+	{ 1, NULL, filt_sordetach, filt_solisten };
+static struct filterops soread_filtops =
+	{ 1, NULL, filt_sordetach, filt_soread };
+static struct filterops sowrite_filtops = 
+	{ 1, NULL, filt_sowdetach, filt_sowrite };
 
 struct	vm_zone *socket_zone;
 so_gen_t	so_gencnt;	/* generation count for sockets */
@@ -1534,16 +1531,32 @@ sopoll(struct socket *so, int events, struct ucred *cred, struct proc *p)
 	return (revents);
 }
 
-static int
-filt_sorattach(struct knote *kn)
+int
+sokqfilter(struct file *fp, struct knote *kn)
 {
 	struct socket *so = (struct socket *)kn->kn_fp->f_data;
-	int s = splnet();
+	struct sockbuf *sb;
+	int s;
 
-	if (so->so_options & SO_ACCEPTCONN)
-		kn->kn_fop = &solisten_filtops;
-	SLIST_INSERT_HEAD(&so->so_rcv.sb_sel.si_note, kn, kn_selnext);
-	so->so_rcv.sb_flags |= SB_KNOTE;
+	switch (kn->kn_filter) {
+	case EVFILT_READ:
+		if (so->so_options & SO_ACCEPTCONN)
+			kn->kn_fop = &solisten_filtops;
+		else
+			kn->kn_fop = &soread_filtops;
+		sb = &so->so_rcv;
+		break;
+	case EVFILT_WRITE:
+		kn->kn_fop = &sowrite_filtops;
+		sb = &so->so_snd;
+		break;
+	default:
+		return (1);
+	}
+
+	s = splnet();
+	SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext);
+	sb->sb_flags |= SB_KNOTE;
 	splx(s);
 	return (0);
 }
@@ -1576,18 +1589,6 @@ filt_soread(struct knote *kn, long hint)
 	return (kn->kn_data >= so->so_rcv.sb_lowat);
 }
 
-static int
-filt_sowattach(struct knote *kn)
-{
-	struct socket *so = (struct socket *)kn->kn_fp->f_data;
-	int s = splnet();
-
-	SLIST_INSERT_HEAD(&so->so_snd.sb_sel.si_note, kn, kn_selnext);
-	so->so_snd.sb_flags |= SB_KNOTE;
-	splx(s);
-	return (0);
-}
-
 static void
 filt_sowdetach(struct knote *kn)
 {