From: Oksana Vohchana <ovoshcha@redhat.com>
To: qemu-devel@nongnu.org
Cc: ovoshcha@redhat.com, philmd@redhat.com, ehabkost@redhat.com,
wainersm@redhat.com, crosa@redhat.com
Subject: [PATCH v2 1/3] Adding functions _send_fds and _recv_fds
Date: Thu, 20 Feb 2020 17:10:37 +0200 [thread overview]
Message-ID: <20200220151039.20552-2-ovoshcha@redhat.com> (raw)
In-Reply-To: <20200220151039.20552-1-ovoshcha@redhat.com>
It provides new possibilities to send or receive data through the Unix domain
socket file descriptor.
This is useful for obtaining a socket that belongs to a different network
namespace.
Signed-off-by: Oksana Vohchana <ovoshcha@redhat.com>
---
python/qemu/machine.py | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/python/qemu/machine.py b/python/qemu/machine.py
index 183d8f3d38..976316e5f5 100644
--- a/python/qemu/machine.py
+++ b/python/qemu/machine.py
@@ -24,6 +24,7 @@ import subprocess
import shutil
import socket
import tempfile
+import array
from . import qmp
@@ -155,6 +156,29 @@ class QEMUMachine(object):
self._args.append(','.join(options))
return self
+ def _recv_fds(self, sock, msglen=8192, maxfds=4096):
+ """
+ Function from:
+ https://docs.python.org/3/library/socket.html#socket.socket.recvmsg
+ """
+ fds = array.array("i")
+ msg, ancdata, flags, addr = sock.recvmsg(msglen, socket.CMSG_LEN(
+ maxfds * fds.itemsize))
+ for cmsg_level, cmsg_type, cmsg_data in ancdata:
+ if (cmsg_level == socket.SOL_SOCKET and
+ cmsg_type == socket.SCM_RIGHTS):
+ fds.frombytes(cmsg_data[:len(cmsg_data) - (len(cmsg_data)
+ % fds.itemsize)])
+ return msg, list(fds)
+
+ def _send_fds(self, sock, msg, fds):
+ """
+ Function from:
+ https://docs.python.org/3/library/socket.html#socket.socket.sendmsg
+ """
+ return sock.sendmsg([msg], [(socket.SOL_SOCKET, socket.SCM_RIGHTS,
+ array.array("i", fds))])
+
def send_fd_scm(self, fd=None, file_path=None):
"""
Send an fd or file_path to socket_scm_helper.
--
2.21.1
next prev parent reply other threads:[~2020-02-20 15:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 15:10 [PATCH v2 0/3] Migration mechanism with FD Oksana Vohchana
2020-02-20 15:10 ` Oksana Vohchana [this message]
2020-02-20 15:10 ` [PATCH v2 2/3] Updates send_fd_scm function Oksana Vohchana
2020-02-20 15:10 ` [PATCH v2 3/3] Acceptance test: FD migration Oksana Vohchana
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