class VppTransportShmemIOError(IOError):
- pass
+ """ exception communicating with vpp over shared memory """
+
+ def __init__(self, rv, descr):
+ self.rv = rv
+ self.desc = descr
+
+ super(VppTransportShmemIOError, self).__init__(rv, descr)
class VppTransport(object):
size = ffi.new("int *")
rv = vpp_api.vac_read(mem, size, self.read_timeout)
if rv:
- raise VppTransportShmemIOError(rv, 'vac_read failed')
+ strerror = 'vac_read failed. It is likely that VPP died.'
+ raise VppTransportShmemIOError(rv, strerror)
msg = bytes(ffi.buffer(mem[0], size[0]))
vpp_api.vac_free(mem[0])
return msg