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how to read data from a socket given a file descriptor

P: n/a
I'm writing some code using PyGTK2 that uses inpu_add_full() to watch a
socket. I've included the code below. I have two questions:

1) What does a condition == 16 mean? It does match any of the
gtk.gdk.INPUT_* values. What is the use of the condition variable in the

2) The source variable in the call back is an fd. I have some trivial code
that is able to read from a socket:

while 1:
conn = sock.accept()[0]
got = conn.recv(20)
if (got == 'close'): break
conn.send('hello there %d' % (c))
c += 1

But how can I make this work when I get an fd?



def process_socket_message(source, condition):

if condition == gtk.gdk.INPUT_READ:
print 'something to read'
elif condition == gtk.gdk.INPUT_WRITE:
print 'ok to write'
elif condition == gtk.gdk.INPUT_EXCEPTION:
print 'an exception occured on the socket'
print 'I dont know what the condition means'

conn = sock.accept()[0]
got = conn.recv(20)
print got
return gtk.TRUE

if __name__ == '__main__':

widgets = WidgetsWrapper('','toplevel', TopLevelHandlers)

# set up the socket to get messages from a client
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)

# setup and input_add
socket_handler_id = gtk.input_add_full(sock, gtk.gdk.INPUT_READ, process_socket_message)

gtk.mainloop ()
Jul 18 '05 #1
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