Flushing ioctl fixups

- Propagate TCFLSH to slave.
- Actually send flush requests to server.
- TCIFLUSH, TCOFLUSH, and TCIOFLUSH are not ioctls but TCFLSH arguments.
- Re-enable read polls if input is flushed.

ttynvt.c

@@ -665,9 +665,6 @@ static const char *_ioctl_name(int cmd)
         CASE(TIOCINQ);
         CASE(TIOCOUTQ);
         CASE(TCFLSH);
-        CASE(TCIFLUSH);
-        CASE(TCOFLUSH);
-        CASE(TCIOFLUSH);
         CASE(TIOCMGET);
         CASE(TIOCMBIS);
         CASE(TIOCMBIC);
@@ -784,6 +781,9 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
 
             ioctl(tty->fds[FD_SLAVE].fd, cmd, tio);
 
+            if (cmd == TCSETSF)
+                tty->n_fds = 3; /* Re-enable polling of Slave */
+
             fuse_reply_ioctl(req, 0, 0, 0);
         }
         break;
@@ -805,33 +805,23 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
         fuse_reply_ioctl(req, 0, &val, sizeof(int));
         break;
     case TCFLSH:
-        if (arg == TCIFLUSH)
+        switch ((size_t) arg)
         {
-            /*todo */
+        default:
+        case TCIFLUSH:
+            byte = 1;
+            tty->n_fds = 3;     /* Re-enable polling of Slave */
+            break;
+        case TCOFLUSH:
+            byte = 2;
+            break;
+        case TCIOFLUSH:
+            byte = 3;
+            tty->n_fds = 3;     /* Re-enable polling of Slave */
+            break;
         }
-        else if ((size_t) arg == TCOFLUSH)
-        {
-            /*todo */
-        }
-        else if ((size_t) arg == TCIOFLUSH)
-        {
-            /*todo */
-        }
-        fuse_reply_ioctl(req, 0, 0, 0);
-        break;
-    case TCIFLUSH:
-        byte = 1;
-        telnet_rfc2217_cfg(tty->tn, TNS_SET_PURGE, &byte, 1);
-        fuse_reply_ioctl(req, 0, 0, 0);
-        break;
-    case TCOFLUSH:
-        byte = 2;
-        telnet_rfc2217_cfg(tty->tn, TNS_SET_PURGE, &byte, 1);
-        fuse_reply_ioctl(req, 0, 0, 0);
-        break;
-    case TCIOFLUSH:
-        byte = 3;
         telnet_rfc2217_cfg(tty->tn, TNS_SET_PURGE, &byte, 1);
+        ioctl(tty->fds[FD_SLAVE].fd, TCFLSH, arg);
         fuse_reply_ioctl(req, 0, 0, 0);
         break;
     case TIOCMGET: