10-18-2014
OK. So you're sending a request to a server on a socket and immediately after sending the request, you try to read a response from the server with NDELAY set in the socket options. There is no server and no network that can respond that fast to a request.
There are a couple of obvious things you could try:
- Drop the TCP_NDELAY socket option so the read() will wait for data instead of returning immediately if no data is present.
- Drop the 1st read() and start with the poll() or pollsys() to wait for data to be present before attempting the read().
I haven't tried to evaluate the arguments to
pollsys() to see if your program is waiting for data on a group of file descriptors or just waiting for data on fd #4. If it is just waiting for data on fd #4, I would start by trying #1; but if your program can continue processing if data is available on another file descriptor as well, choose option 2.
With what you have shown us there is no way for us to guess why it is taking more than 24 seconds for the server to respond to your request.
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