--- libaitio/src/bpf.c	2013/06/26 15:04:02	1.1.2.17
+++ libaitio/src/bpf.c	2013/06/26 15:31:17	1.1.2.18
@@ -272,6 +272,11 @@ io_etherRecv(int eth, void * __restrict buf, size_t bu
 #ifdef __FreeBSD__
 	struct bpf_zbuf bz;
 	struct bpf_zbuf_header *bzh;
+#else
+	if (zcbuf) {
+		io_SetErr(ENOTSUP, "bpf zero copy buffer mode is not supported");
+		return -1;
+	}
 #endif
 
 	if (!buf || !buflen) {
@@ -291,16 +296,9 @@ io_etherRecv(int eth, void * __restrict buf, size_t bu
 				bzh = (struct bpf_zbuf_header*) zcache;
 				memcpy(buf, zcache + sizeof(struct bpf_zbuf_header), 
 						MIN(buflen, rlen));
-				ackZCbuf(bzh);
 			}
-			if (!rlen && !ioctl(eth, BIOCROTZBUF, &bz)) {
-				bzh = (struct bpf_zbuf_header*) bz.bz_bufa;
-				if (bzh && chkZCbuf(bzh)) {
-					rlen = bz.bz_buflen;
-					memcpy(buf, bz.bz_bufa + sizeof(struct bpf_zbuf_header), 
-							MIN(buflen, rlen));
-				}
-			}
+			if (!rlen && !ioctl(eth, BIOCROTZBUF, &bz))
+				continue;
 		} while (0);
 #else
 		rlen = -1;