[libvirt] [PATCH] char: drop data written to a disconnected pty

[Ed Swierk]

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 <eswierk at skyportsystems.com>
---
 qemu-char.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qemu-char.c b/qemu-char.c
index 676944a..ccb6923 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -1528,7 +1528,7 @@ static int pty_chr_write(CharDriverState *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);
-- 
1.9.1