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# Test UDP recv and recvfrom with MSG_DONTWAIT
import random
import socket
try:
import errno, time
except ImportError:
print("SKIP")
raise SystemExit
# Server
def instance0():
PORT = random.randrange(10000, 50000)
multitest.globals(IP=multitest.get_network_ip(), PORT=PORT)
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(socket.getaddrinfo("0.0.0.0", PORT)[0][-1])
multitest.next()
begin = time.ticks_ms()
# do some recvs before instance1 starts, when we know no packet is waiting
try:
print(s.recvfrom(8, socket.MSG_DONTWAIT))
except OSError as e:
print(e.errno == errno.EAGAIN)
try:
print(s.recv(8, socket.MSG_DONTWAIT))
except OSError as e:
print(e.errno == errno.EAGAIN)
# the above steps should not have taken any substantial time
elapsed = time.ticks_diff(time.ticks_ms(), begin)
print(True if elapsed < 50 else elapsed)
# Now instance1 will send us a UDP packet
multitest.broadcast("0-ready")
multitest.wait("1-sent")
for _ in range(10): # retry if necessary, to allow for network delay
time.sleep_ms(100)
try:
print(s.recv(8, socket.MSG_DONTWAIT))
break
except OSError as er:
if er.errno != errno.EAGAIN:
raise er
s.close()
# Client
def instance1():
multitest.next()
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(socket.getaddrinfo(IP, PORT)[0][-1])
multitest.wait("0-ready")
print(s.send(b"abcdefgh"))
multitest.broadcast("1-sent")
s.close()
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