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[Qemu-devel] [PATCH] char: drop data written to a disconnected pty

From: Ed Swierk
Subject: [Qemu-devel] [PATCH] char: drop data written to a disconnected pty
Date: Tue, 31 Jan 2017 05:45:29 -0800

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

Signed-off-by: Ed Swierk <address@hidden>
 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 */
         if (!s->connected) {
-            return 0;
+            return len;
     return io_channel_send(s->ioc, buf, len);

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