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char: drop data written to a disconnected pty

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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>
This commit is contained in:
Ed Swierk 2017-01-31 05:45:29 -08:00 committed by Paolo Bonzini
parent f65e821262
commit 1c64fdbc81
1 changed files with 1 additions and 1 deletions
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2
chardev/char-pty.c
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@ -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);