def recv_fd(sock):
"""Get file descriptor for memory map"""
fds = array.array("i") # Array of ints
- _, ancdata, _, _ = sock.recvmsg(0, socket.CMSG_LEN(4))
+ _, ancdata, _, _ = sock.recvmsg(0, socket.CMSG_SPACE(4))
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)])
if self.connected:
return
sock = socket.socket(socket.AF_UNIX, socket.SOCK_SEQPACKET)
+
+ # Our connect races the corresponding recv_fds call in VPP, if we beat
+ # VPP then we will try (unsuccessfully) to receive file descriptors and
+ # will have gone away before VPP can respond to our connect. A short
+ # timeout here stops this error occurring.
+ sock.settimeout(1)
sock.connect(self.socketname)
mfd = recv_fd(sock)