HOw to set a NONBLOCK recvfrom() in SOCKET?

[#ZHU MING#]

Hi,

If O_NONBLOCK is not  set  on the socket's file descriptor,
recvfrom() blocks until a message arrives.  If no messages  are
available  at  the  socket  and  O_NONBLOCK  is  set  on
the socket's file descriptor, recvfrom() fails and sets errno to EAGAIN.

But how to set 0_NONBLOCK on the socket's file descriptor?

Yours
Zhu Ming
                  
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