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fix signal issue in Windows

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also refactor code and incorporate some "pythonic" patterns
This commit is contained in:
Babak Farrokhi 2016-04-14 20:51:13 +04:30
parent 8322a83e52
commit 20d007d672
1 changed files with 13 additions and 12 deletions
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25
dnseval.py
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@ -60,12 +60,9 @@ def signal_handler(sig, frame):
should_stop = True # pressed once, exit gracefully
def widest_len(names):
width = 8
for s in names:
if len(s) > width:
width = len(s)
return width
def maxlen(names):
sn = sorted(names, key=len)
return len(sn[-1])
def dnsping(host, server, dnsrecord, timeout, count):
@ -114,8 +111,11 @@ def dnsping(host, server, dnsrecord, timeout, count):
def main():
signal.signal(signal.SIGTSTP, signal.SIG_IGN) # ignore CTRL+Z
signal.signal(signal.SIGINT, signal_handler) # ignore CTRL+C
try:
signal.signal(signal.SIGTSTP, signal.SIG_IGN) # ignore CTRL+Z
signal.signal(signal.SIGINT, signal_handler) # ignore CTRL+C
except AttributeError: # Some systems may not support all signals
pass
if len(sys.argv) == 1:
usage()
@ -163,15 +163,16 @@ def main():
f = resolvers
if len(f) == 0:
print("No nameserver specified")
width = widest_len(f)
f = [ name.strip() for name in f]
width = maxlen(f)
blanks = (width - 5) * ' '
print('server ', blanks, ' avg(ms) min(ms) max(ms) stddev(ms) lost(%)')
print((60 + width) * '-')
for server in f:
s = server.strip()
if not s:
if not server:
continue
(server, r_avg, r_min, r_max, r_stddev, r_lost_percent) = dnsping(hostname, s, dnsrecord, waittime, count)
(server, r_avg, r_min, r_max, r_stddev, r_lost_percent) = dnsping(hostname, server, dnsrecord, waittime, count)
server = server.ljust(width + 1)
print("%s %-8.3f %-8.3f %-8.3f %-8.3f %%%d" % (