[PATCH 07/15] python/aqmp: add send_fd_scm

[John Snow <jsnow@redhat.com>]

The single space is indeed required to successfully transmit the file
descriptor to QEMU.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 python/qemu/aqmp/qmp_client.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/python/qemu/aqmp/qmp_client.py b/python/qemu/aqmp/qmp_client.py
index d2ad7459f9..58f85990bc 100644
--- a/python/qemu/aqmp/qmp_client.py
+++ b/python/qemu/aqmp/qmp_client.py
@@ -9,6 +9,8 @@
 
 import asyncio
 import logging
+import socket
+import struct
 from typing import (
     Dict,
     List,
@@ -624,3 +626,18 @@ async def execute(self, cmd: str,
         """
         msg = self.make_execute_msg(cmd, arguments, oob=oob)
         return await self.execute_msg(msg)
+
+    @upper_half
+    @require(Runstate.RUNNING)
+    def send_fd_scm(self, fd: int) -> None:
+        """
+        Send a file descriptor to the remote via SCM_RIGHTS.
+        """
+        assert self._writer is not None
+        sock = self._writer.transport.get_extra_info('socket')
+
+        # Python 3.9+ adds socket.send_fds(...)
+        sock.sendmsg(
+            [b' '],
+            [(socket.SOL_SOCKET, socket.SCM_RIGHTS, struct.pack('@i', fd))]
+        )
-- 
2.31.1