diff --git a/ttynvt.c b/ttynvt.c
index ceed9d8..de5acb6 100644
--- a/ttynvt.c
+++ b/ttynvt.c
@@ -196,10 +196,14 @@ static void    *_read_net(void *arg)
     int             res;
 
     pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
+    DBG2("%s: net_cnt=%d\n", __func__, tty->net_cnt);
 
     while (1)
     {
         res = poll(tty->fds, 3, -1);
+        DBG2("%s: res=%d events-N/M/S=%#x/%#x/%#x\n", __func__, res,
+             tty->fds[FD_NET].revents, tty->fds[FD_MASTER].revents,
+             tty->fds[FD_SLAVE].revents);
         if (res < 0)
         {
             if (errno == EINTR)
@@ -254,6 +258,8 @@ static void    *_read_net(void *arg)
         }
     }
 
+    DBG2("%s: done\n", __func__);
+
     tty->error = 1;
     _notify(tty);
 
@@ -305,6 +311,9 @@ static int _srv_write(void *cctx, const void *buf, int len)
 
     res = write(tty->fds[FD_NET].fd, buf, len);
 
+    DBG2("%s: fd=%d: len=%u: res=%d\n", __func__,
+         tty->fds[FD_NET].fd, len, res);
+
     return res;
 }
 
@@ -313,9 +322,12 @@ static int _srv_read(void *cctx, int timeout)
     ttynvt_t       *tty = cctx;
     int             res;
 
+    DBG2("%s: net_cnt=%d\n", __func__, tty->net_cnt);
     while (1)
     {
         res = poll(&tty->fds[FD_NET], 1, timeout);
+        DBG("%s: res=%d events-N=%#x\n",
+            __func__, res, tty->fds[FD_NET].revents);
         if (res <= 0)
             return res;
 
@@ -323,10 +335,13 @@ static int _srv_read(void *cctx, int timeout)
         {
             res = read(tty->fds[FD_NET].fd, tty->net_buf + tty->net_cnt,
                        NET_BUF_SIZE - tty->net_cnt);
+            DBG2("%s: fd=%d: res=%d net_cnt=%d\n", __func__,
+                 tty->fds[FD_NET].fd, res, tty->net_cnt);
             if (res <= 0)
                 return res;
             tty->net_cnt += res;
             res = telnet_rx(tty->tn, tty->net_buf, &tty->net_cnt);
+            DBG2("%s: res=%d net_cnt=%d\n", __func__, res, tty->net_cnt);
             if (res == 0)
                 break;
         }
@@ -373,7 +388,7 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     int             res;
     int             n;
 
-    DBG2("open: thread:%lu\n", pthread_self());
+    DBG("%s\n", __func__);
 
     tty = calloc(1, sizeof(*tty));
     if (!tty)
@@ -477,9 +492,11 @@ ttynvt_read(fuse_req_t req, size_t size, off_t off,
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
     int             res;
 
+    DBG2("%s\n", __func__);
+
     if (tty->error)
     {
-        DBG2("read (slave) in error state, thread:%lu\n", pthread_self());
+        DBG2("%s: tty->error=%d\n", __func__, tty->error);
         if (tty->epipe == 0)
         {
             _log(LOG_WARNING, "Rx EPIPE\n");
@@ -502,12 +519,13 @@ ttynvt_read(fuse_req_t req, size_t size, off_t off,
     fuse_req_interrupt_func(req, NULL, NULL);
     if (res < 0)
     {
-        DBG2("read (slave) error: %m\n");
+        DBG2("%s: error: %m\n", __func__);
         fuse_reply_err(req, errno);
         return;
     }
 
-    DBG2("read (slave): size:%d, thread:%lu\n", res, pthread_self());
+    DBG2("%s: fd=%d: sz=%u/%u: '%.*s'\n", __func__,
+         tty->fds[FD_SLAVE].fd, res, (int)size, res, tty->tmp_buf);
 
     fuse_reply_buf(req, tty->tmp_buf, res);
 }
@@ -519,6 +537,8 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
     int             res;
 
+    DBG2("%s: fd=%d: sz=%u: '%.*s'\n", __func__,
+         tty->fds[FD_SLAVE].fd, (int)size, (int)size, data);
 
     if (size == 0)
     {
@@ -528,6 +548,7 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
 
     if (tty->error)
     {
+        DBG2("%s: tty->error=%d\n", __func__, tty->error);
         fuse_reply_err(req, EPIPE);
         return;
     }
@@ -535,14 +556,12 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
     res = write(tty->fds[FD_SLAVE].fd, data, size);
     if (res < 0)
     {
-        DBG2("write (slave) error: %m\n");
+        DBG2("%s: error: %m\n", __func__);
         tty->error = 1;
         fuse_reply_err(req, errno);
         return;
     }
 
-    DBG2("write (slave): size:%d, thread:%lu\n", (int)size, pthread_self());
-
     fuse_reply_write(req, res);
 }
 
@@ -891,6 +910,9 @@ ttynvt_poll(fuse_req_t req, struct fuse_file_info *info,
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
     int             revents = 0;
 
+    DBG2("%s: tty->pollin=%d tty->error/epipe=%d/%d\n",
+         __func__, tty->pollin, tty->error, tty->epipe);
+
     _update_notify(tty, ph);
 
     if (tty->pollin)
@@ -906,6 +928,8 @@ ttynvt_poll(fuse_req_t req, struct fuse_file_info *info,
             revents = 0;
     }
 
+    DBG2("%s: revents=%#x\n", __func__, revents);
+
     fuse_reply_poll(req, revents);
 }