top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

In socket programming using python how much time does the socket.recv() system call waits for the message?

+2 votes
493 views

As per my understanding Receive system calls will be a blocking call of the code... it will not go ahead unless it receives the response from client .. my question is how would i set time in that? i want my code should wait only for few seconds then it has to come out from that

posted Mar 12, 2015 by Chirag Gangdev

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

+1 vote
 
Best answer

You can make your socket as nonblocking in the folllowing way 

socket.setblocking(0)
while (retry_condition):
       data = socket.recv(512)
       ....

If you want to block the socket for certain time say 5 sec then leave your socket in blocking mode with the timeout say 

socket.setblocking(1) // 1 is for blocking and is default behavior also 
socket.settimeout(5.0)
...
answer Mar 13, 2015 by Salil Agrawal
Similar Questions
0 votes
the exact use of listen system call in socket-programming?

is it for No of connection can be accepted?
or is it for no of client can be in queue while SFD is busy..?

i have kept 0 as an argument in listen, still it is taking 10 connection..
but if i remove listen then it is showing an error..

Can anybody please help in this?

Thanks in advance

0 votes
How to raise a socket "104 connection reset by peer error" in Python

For testing purposes I want my code to raise a socket "connection reset by peer" error, so that I can test how I handle it, but I am not sure how to raise the error.

+2 votes
HTTP over Asynchronous AF_UNIX Socket in python

The problem description:

There are set of processes running on my system say process_set_1. Build a process agent which runs an asynchronous socket listening to incoming requests from process_set_1. Each process sends an id. The agent stores these ids in a dictionary and sends response that ur id has been accepted. Now agent process receives some data from another process (which is some sort of sister process for the agent). This data contains id along with a command which is to be sent by the agent to the process_set_1 through HTTP client over AF_UNIX socket, since each process in process_set_1 has a HTTP listening CLI. The process agent sends an HTTP request by recognizing id stored in dictionary to the process_set_1. A service running in the process_set_1 routes this HTTP command to the respective process.

Now my problem is the HTTP request which to be sent must go through AF_UNIX socket. I got this solution.

class UnixStreamHTTPConnection(httplib.HTTPConnection):

    def __init__(self, path, host='localhost/rg_cli',port=None, strict=None,
                 timeout=None):
        httplib.HTTPConnection.__init__(self, host, port=port, strict=strict,
                                        timeout=timeout)
        self.path=path

    def connect(self):
        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        self.sock.connect(self.path)

But this cannot work since normal socket will not work and thus i thought of asyncore module in python. To use asyncore module again i will have to subclass asyncore.dispatcher. This class also contains connect() method.

Another problem is I don't know how asyncore module works and thus not able to find a way to mix the work of 1) listening forever, accept the connection, store id and the sock_fd.
2) accept data from the process' agent sister process, retrieve the sock_fd by matching the id in the dictionary and send it through the AF_UNIX socket.

Please help since i have already spent 2 days digging it out. Sorry if could explain my problem very well.

...