How to set timeout on python's socket recv met

Question

I need to set timeout on python's socket recv method. How to do it?

Answer 1

As mentioned both select.select() and socket.settimeout() will work.

Note you might need to call settimeout twice for your needs, e.g.

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# accept can throw socket.timeout
sock.settimeout(5.0)
conn, addr = sock.accept()

# recv can throw socket.timeout
conn.settimeout(5.0)
conn.recv(1024)

Answer 2

You can use socket.settimeout() which accepts a integer argument representing number of seconds. For example, socket.settimeout(1) will set the timeout to 1 second

Answer 3

You could set timeout before receiving the response and after having received the response set it back to None:

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

sock.settimeout(5.0)
data = sock.recv(1024)
sock.settimeout(None)

Answer 4

The typical approach is to use select() to wait until data is available or until the timeout occurs. Only call recv() when data is actually available. To be safe, we also set the socket to non-blocking mode to guarantee that recv() will never block indefinitely. select() can also be used to wait on more than one socket at a time.

import select

mysocket.setblocking(0)

ready = select.select([mysocket], [], [], timeout_in_seconds)
if ready[0]:
    data = mysocket.recv(4096)

If you have a lot of open file descriptors, poll() is a more efficient alternative to select().

Another option is to set a timeout for all operations on the socket using socket.settimeout(), but I see that you've explicitly rejected that solution in another answer.

Answer 5

try this it uses the underlying C.

timeval = struct.pack('ll', 2, 100)

s.setsockopt(socket.SOL_SOCKET,SO_RCVTIMEO, timeval)

Answer 6

there's socket.settimeout()