pingbell

#!/usr/bin/env python
#
# $Id: pingbell,v 1.4 2014/04/09 04:51:33 dtg Exp $
# $Source: /Users/dtg/bin/RCS/pingbell,v $

import errno
import os
import signal
import subprocess
import sys
import time

def main():
    args = list(sys.argv)
    args[0] = 'ping'
    p = subprocess.Popen(args, stdin=None,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT, close_fds=True)
    def handle_sig(sig, stack):
        os.kill(p.pid, sig)
    for sig in (signal.SIGTERM, signal.SIGINT, ):
        signal.signal(sig, handle_sig)
    p_out = p.stdout
    sys_out = sys.stdout
    line = True
    while line:
        try:
            line = p_out.readline()
        except IOError, exc:
            if exc.errno not in (
                errno.EINTR,
                errno.EAGAIN,
                errno.ETIMEDOUT,
                ): raise
        if 'bytes from' in line and 'time=' in line:
            sys_out.write('\x07')
        iso_str = time.strftime('%Y-%m-%dT%H:%M:%S%z ', time.localtime())
        sys_out.write(iso_str)
        sys_out.write(line)
        sys_out.flush()

if __name__ == '__main__':
    main()