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Improved handling of current working directory (CWD).
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@@ -264,7 +264,7 @@ static bool modbus_send_rtu (modbus_message_t *msg, const modbus_callbacks_t *ca
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while(spin_lock);
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if(block) {
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if((block &= !sys.blocking_event)) {
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if(is_blocking)
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return false;
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