A simple ping program written in Python. ====================================

Tested it on Ubuntu 15.04(3.19.0-34-generic).

Get started ----------

Install it from GitHub with pip, you must use root permission: :

sudo pip install git+https://github.com/Damnever/dping.git@master

Run it, root permission is also required, no optional arguments: :

sudo dping example-site.com

That's it. You can learn more from the source code.

About the C extension -------------------

The reason to write the C extension is I want to block SIGINT when a ping request-response cycle is not finished. And, the Python signal module is weak, it can not support for pending a signal.

You can consider the situation like this: it sends a ICMP packet to destination, and it increases transmitted counter value, it waiting for receiving a ICMP response packet, then it increases received counter value. If it sends a packet then you enter Ctrl+C, then the program will be interrupted, it will loss the ICMP response packet and received counter value, so the loss rate is not exactly incorrect.

Why don't I just throw the last counter value away? Because I do not wanna do this, I want to learn more and ...

The C extension is usefull. For example:

import time
import signal

from dping.sigpending import sigpending


def main():
    try:
        with sigpending(signal.SIGINT):
            print('Doing sth.')
            for i in range(1, 6):
                time.sleep(1)
                print('{0} sec passed!'.format(i))
            print('Done.')
    except KeyboardInterrupt:
        print('\nInterruped')

if __name__ == '__main__':
    main()

Ouput(^C is Ctrl+C): :

Doing sth.
1 sec passed!
^C2 sec passed!
3 sec passed!
4 sec passed!
5 sec passed!
Done.

Interruped