Modify network detection on QNX to delay SD #841
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Implemented a "simple_connector" to mimic the netlink_connector available on Linux. This connector, along with vsomeip3.5.4 introduction of the RS_DELAYED_RESUME routing state, allows us to delay SD until the network is available. The simple_connector works by using QNX's waitfor to wait for a file whose creation indicates network availability. This file is created externally. The simple_connector does not continue to monitor the network. It simply notifies the routing_manager the first time the network is available. That said, the interface does allow for easy extension in the future This behaviour is controlled with the env vars VSOMEIP_USE_ASYNCHRONOUS_SD and VSOMEIP_WAIT_FOR_INTERFACE. An alternative implementation would be to use PPS, but that isn't available by default on our deployment of QNX 7. This implementation has a reduced foot print from earlier implementations and also does not modify any interfaces. Notes: - There is no timeout on the waitfor. The original implementation had a configurable timeout, however because timing out left us in an error state anyways, this timeout was removed (raised to numeric_limits<int>::max() = ~45 days, give or take.)
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Overview
Introducing a
simple_connectorto mimic thenetlink_connector(in a very limited way) on QNX. This PR is not intended to be merged upstream, but instead serves as a discussion topic and example.Description
Implemented a "simple_connector" to mimic the
netlink_connectoravailable on Linux. This connector, along with vsomeip3.5.4 introduction of theRS_DELAYED_RESUMErouting state, allows us to delay SD until the network is available.The simple_connector works by using QNX's
waitforto wait for a file whose creation indicates network availability. This file is created externally.The
simple_connectordoes not continue to monitor the network. It simply notifies the routing_manager the first time the network is available.That said, the interface does allow for easy extension in the future
This behaviour is controlled with the env vars
VSOMEIP_USE_ASYNCHRONOUS_SDandVSOMEIP_WAIT_FOR_INTERFACE.An alternative implementation would be to use PPS, but that isn't available by default on our deployment of QNX 7.
This implementation has a reduced foot print from earlier implementations and also does not modify any interfaces.
Notes
waitfor. The original implementation had a configurable timeout, however because timing out left us in an error state anyways, this timeout was removed (raised tonumeric_limits<int>::max()= ~45 days, give or take.)