Add chardev-send-break monitor command

Sending a break on a serial console can be useful for debugging the
guest. But not all chardev backends support sending breaks (only telnet
and mux do). The chardev-send-break command allows to send a break even
if using other backends.

Signed-off-by: Stefan Fritsch <sf@sfritsch.de>
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20170611074817.13621-1-sf@sfritsch.de>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  Use 'send a break' in all 3 pieces of text as suggested by eblake

1 files changed, 16 insertions, 0 deletions

diff --git a/hmp-commands.hx b/hmp-commands.hx
index e763606fe5..275ccdfbc7 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1745,6 +1745,22 @@ Removes the chardev @var{id}.
 ETEXI
 
     {
+        .name       = "chardev-send-break",
+        .args_type  = "id:s",
+        .params     = "id",
+        .help       = "send a break on chardev",
+        .cmd        = hmp_chardev_send_break,
+        .command_completion = chardev_remove_completion,
+    },
+
+STEXI
+@item chardev-send-break id
+@findex chardev-send-break
+Send a break on the chardev @var{id}.
+
+ETEXI
+
+    {
         .name       = "qemu-io",
         .args_type  = "device:B,command:s",
         .params     = "[device] \"[command]\"",