micropython/tests/net_hosted/accept_nonblock.py

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# test that socket.accept() on a non-blocking socket raises EAGAIN
try:
import usocket as socket
except:
import socket
s = socket.socket()
s.bind(socket.getaddrinfo('127.0.0.1', 8123)[0][-1])
s.setblocking(False)
s.listen(1)
try:
s.accept()
except OSError as er:
print(er.args[0] == 11) # 11 is EAGAIN
s.close()