python中的socket.recv（255）挂起等待数据

Question

Newbie question here,

I am trying to hack an existing python program that searches for bluethooth signal

all works fine if there is a bluetooh transmitter around,

but the program simply sits there if there is no Bluetooth signal around.

I found out that it is getting hung on this line

    pkt = sock.recv(255)

I am naively guessing that is simply sitting there waiting for data, I want it to give me an error or timeout after lets say 10 seconds.

How do I do this? Is my thinking correct?

Thanks

Answer 1

Call settimeout before recving. Then it will raise an error if it takes too long.

sock.settimeout(10)
try:
    pkt = sock.recv(255)
except socket.error:
    print "connection timed out!"
    return