diff --git a/mio/bin/t01.c b/mio/bin/t01.c
index 1bc3d9a..40db095 100644
--- a/mio/bin/t01.c
+++ b/mio/bin/t01.c
@@ -671,8 +671,12 @@ static int x = 0;
 int y;
 int z = 0;
 
-	//y = ++x;
+#if defined(__ATOMIC_RELAXED)
 	y = __atomic_add_fetch (&x, 1, __ATOMIC_RELAXED);
+#else
+	// this is buggy..
+	y = ++x;
+#endif
 
 	while ((n = read(iop->rfd, buf, MIO_COUNTOF(buf)))> 0) write (iop->wfd, buf, n);
 
@@ -1031,6 +1035,7 @@ int main (int argc, char* argv[])
 	}
 
 
+	memset (&tcp_lstn, 0, MIO_SIZEOF(tcp_lstn));
 	tcp_lstn.backlogs = 100;
 	if (mio_dev_sck_listen(tcp[1], &tcp_lstn) <= -1)
 	{
@@ -1139,7 +1144,8 @@ for (i = 0; i < 5; i++)
 
 	dnc = mio_svc_dnc_start(mio, &servaddr, MIO_NULL, &send_tmout, &reply_tmout, 2); /* option - send to all, send one by one */
 	htts = mio_svc_htts_start(mio, &htts_bind_addr, process_http_request);
-	mio_svc_htts_setservernamewithbcstr (htts, "MIO-HTTP");
+	if (htts) mio_svc_htts_setservernamewithbcstr (htts, "MIO-HTTP");
+	else MIO_INFO1 (mio, "UNABLE TO START HTTS - %js\n", mio_geterrmsg(mio));
 
 #if 1
 	{
@@ -1258,6 +1264,7 @@ if (!mio_svc_dnc_resolve(dnc, "google.com", MIO_DNS_RRT_SOA, MIO_SVC_DNC_RESOLVE
 }
 #endif
 
+#if 0
 {
 	mio_dev_pipe_t* pp;
 	mio_dev_pipe_make_t mi;
@@ -1281,6 +1288,7 @@ for (i = 0; i < 20; i++)
 	mio_dev_thr_write (tt, "hello, world", 12, MIO_NULL);
 	mio_dev_thr_write (tt, MIO_NULL, 0, MIO_NULL);
 }
+#endif
 
 	mio_loop (mio);
 
diff --git a/mio/lib/http-svr.c b/mio/lib/http-svr.c
index a5300c7..28b4290 100644
--- a/mio/lib/http-svr.c
+++ b/mio/lib/http-svr.c
@@ -395,7 +395,7 @@ mio_svc_htts_t* mio_svc_htts_start (mio_t* mio, const mio_skad_t* bind_addr, mio
 
 	MIO_MEMSET (&info, 0, MIO_SIZEOF(info));
 	info.b.localaddr = *bind_addr;
-	info.b.options = MIO_DEV_SCK_BIND_REUSEADDR | MIO_DEV_SCK_BIND_REUSEPORT;
+	info.b.options = MIO_DEV_SCK_BIND_REUSEADDR | MIO_DEV_SCK_BIND_REUSEPORT | MIO_DEV_SCK_BIND_IGNERR;
 	/*info.b.options |= MIO_DEV_SCK_BIND_SSL; */
 	info.b.ssl_certfile = "localhost.crt";
 	info.b.ssl_keyfile = "localhost.key";
@@ -826,6 +826,7 @@ static int cgi_peer_on_read (mio_dev_pro_t* pro, mio_dev_pro_sid_t sid, const vo
 
 		MIO_ASSERT (mio, !(cgi_state->over & CGI_STATE_OVER_READ_FROM_PEER));
 
+printf ("FEED %d BYTES TO HTRD\n", (int)dlen);
 		if (mio_htrd_feed(cgi_state->peer_htrd, data, dlen, &rem) <= -1) 
 		{
 			MIO_DEBUG3 (mio, "HTTPS(%p) - unable to feed peer into to htrd - peer %p(pid=%u)\n", cgi_state->htts, pro, (unsigned int)pro->child_pid);
@@ -964,7 +965,9 @@ static int cgi_peer_htrd_push_content (mio_htrd_t* htrd, mio_htre_t* req, const
 			mio_bch_t lbuf[16];
 			mio_oow_t llen;
 
-			llen = mio_fmt_uintmax_to_bcstr(lbuf, MIO_COUNTOF(lbuf) - 2, dlen, 16 | MIO_FMT_UINTMAX_UPPERCASE, 0, '\0', MIO_NULL);
+			/* mio_fmt_uintmax_to_bcstr() null-terminates the output. only MIO_COUNTOF(lbuf) - 1
+			 * is enough to hold '\r' and '\n' at the back without '\0'. */ 
+			llen = mio_fmt_uintmax_to_bcstr(lbuf, MIO_COUNTOF(lbuf) - 1, dlen, 16 | MIO_FMT_UINTMAX_UPPERCASE, 0, '\0', MIO_NULL);
 			lbuf[llen++] = '\r';
 			lbuf[llen++] = '\n';
 
diff --git a/mio/lib/mio-sck.h b/mio/lib/mio-sck.h
index af57579..edc7450 100644
--- a/mio/lib/mio-sck.h
+++ b/mio/lib/mio-sck.h
@@ -315,6 +315,7 @@ enum mio_dev_sck_bind_option_t
 /* TODO: more options --- SO_RCVBUF, SO_SNDBUF, SO_RCVTIMEO, SO_SNDTIMEO, SO_KEEPALIVE */
 /*   BINDTODEVICE??? */
 
+	MIO_DEV_SCK_BIND_IGNERR      = (1 << 14), /* ignore non-critical error in binding */
 	MIO_DEV_SCK_BIND_SSL         = (1 << 15)
 };
 typedef enum mio_dev_sck_bind_option_t mio_dev_sck_bind_option_t;
diff --git a/mio/lib/mio.c b/mio/lib/mio.c
index d95628d..344f5ff 100644
--- a/mio/lib/mio.c
+++ b/mio/lib/mio.c
@@ -1429,12 +1429,11 @@ static int __dev_writev (mio_dev_t* dev, mio_iovec_t* iov, mio_iolen_t iovcnt, c
 
 	len = 0;
 	for (i = 0; i < iovcnt; i++) len += iov[i].iov_len;
+	urem = len;
 
 	if (!MIO_WQ_IS_EMPTY(&dev->wq)) 
 	{
-		/* the writing queue is not empty. 
-		 * enqueue this request immediately */
-		urem = len;
+		/* if the writing queue is not empty, enqueue this request immediately */
 		goto enqueue_data;
 	}
 
@@ -1523,7 +1522,7 @@ enqueue_data:
 
 	/* queue the remaining data*/
 	q = (mio_wq_t*)mio_allocmem(mio, MIO_SIZEOF(*q) + (dstaddr? dstaddr->len: 0) + urem);
-	if (!q) return -1;
+	if (MIO_UNLIKELY(!q)) return -1;
 
 	q->tmridx = MIO_TMRIDX_INVALID;
 	q->dev = dev;
@@ -1542,7 +1541,7 @@ enqueue_data:
 
 	q->ptr = (mio_uint8_t*)(q + 1) + q->dstaddr.len;
 	q->len = urem;
-	q->olen = len;
+	q->olen = len; /* original length to use when invoking on_write() */
 	for (i = index, j = 0; i < iovcnt; i++)
 	{
 		MIO_MEMCPY (&q->ptr[j], iov[i].iov_ptr, iov[i].iov_len);
diff --git a/mio/lib/mio.h b/mio/lib/mio.h
index 027dcda..b2b1e7c 100644
--- a/mio/lib/mio.h
+++ b/mio/lib/mio.h
@@ -1003,6 +1003,12 @@ MIO_EXPORT void mio_freemem (
 	void*   ptr
 );
 
+MIO_EXPORT void mio_addcfmb (
+	mio_t*             mio,
+	mio_cfmb_t*        cfmb,
+	mio_cfmb_checker_t checker
+);
+
 /* =========================================================================
  * STRING ENCODING CONVERSION
  * ========================================================================= */
diff --git a/mio/lib/pro.c b/mio/lib/pro.c
index 9c51dde..12d003f 100644
--- a/mio/lib/pro.c
+++ b/mio/lib/pro.c
@@ -205,8 +205,19 @@ static pid_t standard_fork_and_exec (mio_dev_pro_t* dev, int pfds[], mio_dev_pro
 			devnull = open("/dev/null", O_RDWR, 0);
 		#endif
 			if (devnull == MIO_SYSHND_INVALID) goto slave_oops;
+
+			if ((mi->flags & MIO_DEV_PRO_INTONUL) && dup2(devnull, 0) == -1) goto slave_oops;
+			if ((mi->flags & MIO_DEV_PRO_OUTTONUL) && dup2(devnull, 1) == -1) goto slave_oops;
+			if ((mi->flags & MIO_DEV_PRO_ERRTONUL) && dup2(devnull, 2) == -1) goto slave_oops;
+
+			close (devnull); 
+			devnull = MIO_SYSHND_INVALID;
 		}
 
+		if (mi->flags & MIO_DEV_PRO_DROPIN) close (0);
+		if (mi->flags & MIO_DEV_PRO_DROPOUT) close (1);
+		if (mi->flags & MIO_DEV_PRO_DROPERR) close (2);
+
 		execv (param->argv[0], param->argv);
 
 		/* if exec fails, free 'param' parameter which is an inherited pointer */
diff --git a/mio/lib/sck.c b/mio/lib/sck.c
index a015e8c..4e4a85f 100644
--- a/mio/lib/sck.c
+++ b/mio/lib/sck.c
@@ -809,8 +809,11 @@ static int dev_sck_ioctl (mio_dev_t* dev, int cmd, void* arg)
 				int v = 1;
 				if (setsockopt(rdev->hnd, SOL_SOCKET, SO_REUSEADDR, &v, MIO_SIZEOF(v)) == -1)
 				{
-					mio_seterrbfmtwithsyserr (mio, 0, errno, "unable to set SO_REUSEADDR");
-					return -1;
+					if (!(bnd->options & MIO_DEV_SCK_BIND_IGNERR))
+					{
+						mio_seterrbfmtwithsyserr (mio, 0, errno, "unable to set SO_REUSEADDR");
+						return -1;
+					}
 				}
 			/* ignore it if not available
 			#else
@@ -826,8 +829,11 @@ static int dev_sck_ioctl (mio_dev_t* dev, int cmd, void* arg)
 				int v = 1;
 				if (setsockopt(rdev->hnd, SOL_SOCKET, SO_REUSEPORT, &v, MIO_SIZEOF(v)) == -1)
 				{
-					mio_seterrbfmtwithsyserr (mio, 0, errno, "unable to set SO_REUSEPORT");
-					return -1;
+					if (!(bnd->options & MIO_DEV_SCK_BIND_IGNERR))
+					{
+						mio_seterrbfmtwithsyserr (mio, 0, errno, "unable to set SO_REUSEPORT");
+						return -1;
+					}
 				}
 			/* ignore it if not available
 			#else
diff --git a/mio/lib/thr.c b/mio/lib/thr.c
index 0facd23..26e924f 100644
--- a/mio/lib/thr.c
+++ b/mio/lib/thr.c
@@ -34,6 +34,17 @@
 
 /* ========================================================================= */
 
+struct mio_dev_thr_info_t
+{
+	MIO_CFMB_HEADER;
+
+	mio_dev_thr_func_t thr_func;
+	mio_dev_thr_iopair_t thr_iop;
+	void* thr_ctx;
+	pthread_t thr_hnd;
+	int thr_done;
+};
+
 struct slave_info_t
 {
 	mio_dev_thr_make_t* mi;
@@ -48,19 +59,6 @@ static mio_dev_thr_slave_t* make_slave (mio_t* mio, slave_info_t* si);
 
 /* ========================================================================= */
 
-struct mio_dev_thr_info_t
-{
-	MIO_CFMB_HEADER;
-
-	mio_dev_thr_func_t thr_func;
-	mio_dev_thr_iopair_t thr_iop;
-	void* thr_ctx;
-	pthread_t thr_hnd;
-	int thr_done;
-};
-
-typedef struct mio_dev_thr_info_t mio_dev_thr_info_t;
-
 
 static void free_thr_info_resources (mio_t* mio, mio_dev_thr_info_t* ti)
 {