diff --git a/main.c b/main.c
index b0c252a..bb70362 100644
--- a/main.c
+++ b/main.c
@@ -28,11 +28,15 @@
 
 static ttyd dtty = {.dev = NULL, .mutex = PTHREAD_MUTEX_INITIALIZER};
 
+//FILE *fd;
+
 void signals(int signo){
     if(dtty.dev){
         pthread_mutex_lock(&dtty.mutex);
         close_tty(&dtty.dev);
     }
+    //fprintf(fd, "stop\n");
+    //fflush(fd);
     deinit_ncurses();
     deinit_readline();
     exit(signo);
@@ -48,6 +52,8 @@ int main(int argc, char **argv){
         WARN("Can't open device %s", G->ttyname);
         signals(1);
     }
+    //fd = fopen("loglog", "w");
+    //fprintf(fd, "start\n");
     init_ncurses();
     init_readline();
     const char *EOL = "\n";
@@ -69,9 +75,9 @@ int main(int argc, char **argv){
     if(pthread_create(&writer, NULL, cmdline, (void*)&dtty)) ERR("pthread_create()");
     settimeout(G->tmoutms);
     while(1){
-        //if(0 == pthread_mutex_lock(&dtty.mutex)){
+        if(0 == pthread_mutex_lock(&dtty.mutex)){
             int l = Read_tty(dtty.dev);
-            if(l){
+            if(l > 0){
                 char *buf = dtty.dev->buf;
                 char *eol = NULL, *estr = buf + l;
                 do{
@@ -84,9 +90,13 @@ int main(int argc, char **argv){
                         add_ttydata(buf);
                     }
                 }while(eol && buf < estr);
-            }else if(l < 0) signals(9);
-          //  pthread_mutex_unlock(&dtty.mutex);
-        //}
+            }else if(l < 0){
+                pthread_mutex_unlock(&dtty.mutex);
+                ERRX("Device disconnected");
+            }
+            pthread_mutex_unlock(&dtty.mutex);
+            usleep(1000);
+        }
     }
     // never reached
     return 0;
diff --git a/ncurses_and_readline.c b/ncurses_and_readline.c
index fe4c1ca..28d38fb 100644
--- a/ncurses_and_readline.c
+++ b/ncurses_and_readline.c
@@ -112,32 +112,6 @@ static void msg_win_redisplay(bool for_resize){
     else wrefresh(msg_win);
 }
 
-void add_ttydata(const char *text){
-    if(!text) return;
-    if(!*text) text = " "; // empty string
-    Line *lp = malloc(sizeof(Line));
-    lp->contents = strdup(text);
-    lp->prev = curr;
-    lp->next = NULL;
-    lp->Nline = nr_lines++;
-    if(!curr || !head){
-        head = curr = firstline = lp;
-    }else
-        curr->next = lp;
-    curr = lp;
-    // roll back to show last input
-    if(curr->prev){
-        firstline = curr;
-        int totalln = (strlen(firstline->contents) - 1)/COLS + 1;
-        while(firstline->prev){
-            totalln += (strlen(firstline->prev->contents) - 1)/COLS + 1;
-            if(totalln > LINES-2) break;
-            firstline = firstline->prev;
-        }
-    }
-    msg_win_redisplay(false);
-}
-
 static void cmd_win_redisplay(bool for_resize){
     int cursor_col = 2 + rl_point; // "> " width is 2
     werase(cmd_win);
@@ -168,6 +142,34 @@ static void show_mode(bool for_resize){
     cmd_win_redisplay(for_resize);
 }
 
+void add_ttydata(const char *text){
+    if(!text) return;
+    if(!*text) text = " "; // empty string
+    Line *lp = malloc(sizeof(Line));
+    lp->contents = strdup(text);
+    lp->prev = curr;
+    lp->next = NULL;
+    lp->Nline = nr_lines++;
+    if(!curr || !head){
+        head = curr = firstline = lp;
+    }else
+        curr->next = lp;
+    curr = lp;
+    // roll back to show last input
+    if(curr->prev){
+        firstline = curr;
+        int totalln = (strlen(firstline->contents) - 1)/COLS + 1;
+        while(firstline->prev){
+            totalln += (strlen(firstline->prev->contents) - 1)/COLS + 1;
+            if(totalln > LINES-2) break;
+            firstline = firstline->prev;
+        }
+    }
+    msg_win_redisplay(true);
+    show_mode(true);
+    doupdate();
+}
+
 static void resize(){
     if(LINES > 2){
         wresize(msg_win, LINES - 2, COLS);
@@ -217,26 +219,27 @@ void init_ncurses(){
 }
 
 void deinit_ncurses(){
+    visual_mode = false;
     delwin(msg_win);
     delwin(sep_win);
     delwin(cmd_win);
     endwin();
-    visual_mode = false;
 }
 
 static void got_command(char *line){
+    bool err = false;
     if(!line) // Ctrl-D pressed on empty line
         should_exit = true;
     else{
         if(!*line) return; // zero length
         add_history(line);
         if(dtty && dtty->dev){
-
-            //if(0 == pthread_mutex_lock(&dtty->mutex)){
-                if(write_tty(dtty->dev->comfd, line, strlen(line))) signals(9);
-                if(write_tty(dtty->dev->comfd, dtty->eol, dtty->eollen)) signals(9);
-               // pthread_mutex_unlock(&dtty->mutex);
-            //}
+            if(0 == pthread_mutex_lock(&dtty->mutex)){
+                if(write_tty(dtty->dev->comfd, line, strlen(line))) err = true;
+                else if(write_tty(dtty->dev->comfd, dtty->eol, dtty->eollen)) err = true;
+                pthread_mutex_unlock(&dtty->mutex);
+                if(err) ERRX("Device disconnected");
+            }
         }
         free(line);
     }
@@ -289,6 +292,8 @@ void *cmdline(void* arg){
                 keypad(cmd_win, insert_mode); // enable/disable reaction @ special characters
                 insert_mode = !insert_mode;
                 show_mode(false);
+                if(insert_mode) curs_set(2);
+                else curs_set(0);
             break;
             case KEY_RESIZE:
                 resize();
diff --git a/tty.c b/tty.c
index 315a766..fb58450 100644
--- a/tty.c
+++ b/tty.c
@@ -31,8 +31,10 @@ void settimeout(int tmout){
     usec = tmout * 1000L;
 }
 
+//extern FILE *fd;
+
 int Read_tty(TTY_descr *d){
-    if(d->comfd < 0) return 0;
+    if(!d || d->comfd < 0) return 0;
     size_t L = 0;
     ssize_t l;
     size_t length = d->bufsz;
@@ -46,11 +48,11 @@ int Read_tty(TTY_descr *d){
         FD_SET(d->comfd, &rfds);
         tv.tv_sec = sec; tv.tv_usec = usec;
         retval = select(d->comfd + 1, &rfds, NULL, NULL, &tv);
-        if (!retval) break;
+        if(!retval) break;
+        if(retval < 0) return -1;
         if(FD_ISSET(d->comfd, &rfds)){
             l = read(d->comfd, ptr, length);
-            if(l < 0) return -1;
-            if(l == 0) break;
+            if(l < 1) return -1; // disconnected
             ptr += l; L += l;
             length -= l;
         }