From: Ed Swierk <eswierk@skyportsystems.com>
Date: Tue, 31 Jan 2017 13:45:29 +0000 (-0800)
Subject: char: drop data written to a disconnected pty
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1c64fdbc8177058802df205f5d7cd65edafa59a8;p=qemu.git

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>
---

diff --git a/chardev/char-pty.c b/chardev/char-pty.c
index 27eb85f505..ecf2c7a5c4 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);