char: drop data written to a disconnected pty

When a serial port writes data to a pty that's disconnected, drop the
data and return the length dropped. This avoids triggering pointless
retries in callers like the 16550A serial_xmit(), and causes
qemu_chr_fe_write() to write all data to the log file, rather than
logging only while a pty client like virsh console happens to be
connected.

Signed-off-by: Ed Swierk <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

chardev/char-pty.c

@@ -129,7 +129,7 @@ static int char_pty_chr_write(Chardev *chr, const uint8_t *buf, int len)
         /* guest sends data, check for (re-)connect */
         pty_chr_update_read_handler_locked(chr);
         if (!s->connected) {
-            return 0;
+            return len;
         }
     }
     return io_channel_send(s->ioc, buf, len);