int rv;
vl_shmem_hdr_t *shmem_hdr;
- if (!pm->connected_to_vlib) return -1;
+ /* svm_queue_sub(below) returns {-1, -2} */
+ if (!pm->connected_to_vlib) return -3;
*l = 0;
- if (am->our_pid == 0) return (-1);
+ /* svm_queue_sub(below) returns {-1, -2} */
+ if (am->our_pid == 0) return (-4);
/* Poke timeout thread */
if (timeout)
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