How to fix blocking error when receiving data on non-blocking socket

Question

I'm trying to create a simple echo server that can handle multiple connections, I am using select and need to use non blocking sockets but I get an error saying 'BlockingIOError: [Errno 35] Resource temporarily unavailable' on the line where I receive the data.

Here's the server and client code

inputs = [server]

while True:
    inready, outready, excready = select.select(inputs, [], [])

    for s in inready:
        if s == server:
            client, address = server.accept()
            client.setblocking(0)
            print(address)
            inready.append(client)

        else:
            data = s.recv(1024);
            if data:
                s.send(data)
            else:
                inputs.remove(s)
                s.close()

Armali · Accepted Answer · 2019-02-19 12:59:35Z

1

This little error took me also a while to find:

            inready.append(client)

Correct is, of course:

            inputs.append(client)

Since inready was accidentally modified, the else block was executed when it shouldn't have been.

answered Feb 19, 2019 at 12:59

Armali

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1 Comment

pure Over a year ago

This is life saver! I had the same problem lol! I smash that thumb up button!

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