Index: g_gate.c
===================================================================
RCS file: /private/FreeBSD/src/sys/geom/gate/g_gate.c,v
retrieving revision 1.12
diff -u -p -r1.12 g_gate.c
--- g_gate.c	2 Oct 2004 15:03:26 -0000	1.12
+++ g_gate.c	2 Oct 2004 16:38:19 -0000
@@ -497,6 +497,11 @@ g_gate_ioctl(struct cdev *dev, u_long cm
 			bp = bioq_first(&sc->sc_inqueue);
 			if (bp != NULL)
 				break;
+			if ((ggio->gctl_flags & G_GATE_IOFLAG_NONBLOCK) != 0) {
+				g_gate_release(sc);
+				ggio->gctl_error = EAGAIN;
+				return (0);
+			}
 			if (msleep(sc, &sc->sc_inqueue_mtx,
 			    PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) {
 				g_gate_release(sc);
Index: g_gate.h
===================================================================
RCS file: /private/FreeBSD/src/sys/geom/gate/g_gate.h,v
retrieving revision 1.3
diff -u -p -r1.3 g_gate.h
--- g_gate.h	3 May 2004 21:02:02 -0000	1.3
+++ g_gate.h	2 Oct 2004 16:36:35 -0000
@@ -41,7 +41,7 @@
 #define	G_GATE_MOD_NAME		"ggate"
 #define	G_GATE_CTL_NAME		"ggctl"
 
-#define G_GATE_VERSION		0
+#define G_GATE_VERSION		1
 
 /*
  * Maximum number of request that can be stored in
@@ -61,6 +61,8 @@
 
 #define	G_GATE_INFOSIZE		2048
 
+#define	G_GATE_IOFLAG_NONBLOCK	0x0001
+
 #ifdef _KERNEL
 /*
  * 'P:' means 'Protected by'.
@@ -138,6 +140,7 @@ struct g_gate_ctl_io {
 	off_t		 gctl_offset;
 	off_t		 gctl_length;
 	void		*gctl_data;
+	u_int		 gctl_flags;
 	int		 gctl_error;
 };
 #endif	/* !_G_GATE_H_ */