What happens to a futures or options position you hold during a stock spit or a bonus issue ?
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Exchanges put out circulars as and when explaining how the strike prices would be affected.
So for example if there is 1:5 split, lot size changes, and on the day of the split, all your open positions also change. So in case of bank of baroda, instead of 1 lot at say 1000, the next day you will have 5 lots at 200.
We at Zerodha share this on our circular tool as and when the exchange releases it, have a look: https://zerodha.com/marketintel/Circulars/
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good question buddy 
i am looking for an answer too.
Similar query has been asked before, please search the forum before posting questions!
This is what i find on investopedia , but not sure if it is applicable to our exchanges as well.
When do we know the exact split is going to take place ? It is obviously not on the day it has been declared . Is it going to be mentioned anywhere ?