Oh I see, I used wrong function. All I want is to know if I have in buffer some 
another data to read. In final step I want to have client that have e.g. 10 
connections to several servers. I want to guard with function select() the file 
descriptors. And when select() awakes my thread i want to read the server 
massage. But when I`m reading, it might be possibly, that another server send 
data. So I want to scan buffers for all conection, if there are another data to 
read. I thought that this is possible with the function BIO_pending()

So now I have another Question. Is there any function that says me if there are 
another data in buffer to read. Or I must try to read from all connections 
before I use the select() function again??
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