python socket file read timeout?

Question

I'm using a python socket as a file to talk to another process:

def connect(self):
    try:
        self.sock = socket.socket( socket.AF_INET, socket.SOCK_STREAM)
        self.sock.connect( (self.target, self.port) )
        self.fobj = self.sock.makefile()

Normally I'd write a command through the socket and expect a reply within a certain period. So my question is: is there a way to achieve timeout when reading a line from the socket file object?

Thanks,

what do you mean exactly by saying way to achieve timeout, are you asking for capturing exception? — Aamir Rind
– Aamir Rind, Commented Aug 2, 2011 at 15:13

mdeous · Accepted Answer · 2011-08-02 15:15:52Z

2

Taken from Python's documentation about socket.makefile():

socket.makefile([mode[, bufsize]])

Return a file object associated with the socket. (File objects are described in File Objects.) The file object references a dup()ped version of the socket file descriptor, so the file object and socket object may be closed or garbage-collected independently. The socket must be in blocking mode (it can not have a timeout). The optional mode and bufsize arguments are interpreted the same way as by the built-in file() function.

Therefore you can't have a timeout on a socket-file, if you need timeouts, you must use regular sockets.

answered Aug 2, 2011 at 15:15

mdeous

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4 Comments

NameOfTheRose Over a year ago

Although the documentation says so, it is actually possible and reliable to use timeouts. This was tested on linux and windows with python 2.7.14

Eric Over a year ago

@NameOfTheRose do you have any reference to backup your claim?

NameOfTheRose Over a year ago

@eric, sorry for the delayed response. What do you mean by reference? I have a working program that does that. If you are still interested I will try to post a minimum program demonstrating it.

Eric Over a year ago

you claim it's reliable, is it documented anywhere? By reference I mean documentation.

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