From 1c64fdbc8177058802df205f5d7cd65edafa59a8 Mon Sep 17 00:00:00 2001
From: Ed Swierk <eswierk@skyportsystems.com>
Date: Tue, 31 Jan 2017 05:45:29 -0800
Subject: [PATCH] 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 <eswierk@skyportsystems.com>
Message-Id: <1485870329-79428-1-git-send-email-eswierk@skyportsystems.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
chardev/char-pty.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/chardev/char-pty.c b/chardev/char-pty.c
index 27eb85f5056..ecf2c7a5c42 100644
--- a/chardev/char-pty.c
+++ b/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);
--
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