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-rw-r--r--src/vpp-api/python/vpp_papi/vpp_transport_shmem.py11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/vpp-api/python/vpp_papi/vpp_transport_shmem.py b/src/vpp-api/python/vpp_papi/vpp_transport_shmem.py
index 53ae775069f..64c1a59ba74 100644
--- a/src/vpp-api/python/vpp_papi/vpp_transport_shmem.py
+++ b/src/vpp-api/python/vpp_papi/vpp_transport_shmem.py
@@ -48,7 +48,13 @@ def vac_error_handler(arg, msg, msg_len):
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):
@@ -117,7 +123,8 @@ 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