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Commit a5c239e

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update
1 parent 3e17105 commit a5c239e

16 files changed

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lines changed

‎README.md‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -183,7 +183,7 @@ python的强大之处有很大的一方面在于它有各种各样非常强大
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## [csv](content/csv.md)
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## [][signal](content/signal.md)
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## [signal](content/signal.md)
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## [asyncore](content/asyncore.md)
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‎code/signal_alarm.py‎

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# -*- coding: utf-8 -*-
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import time
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import signal
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# After finish alarm
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def receive_alarm(signum, stack):
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print 'Alarm :', time.ctime()
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# Call receive_alarm with 2 seconds
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signal.signal(signal.SIGALRM, receive_alarm)
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print 'Before:', time.ctime()
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# Unix only
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signal.alarm(2)
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print 'After alarm :', time.ctime()
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# Alarm will finish sleep
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time.sleep(3)
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print 'After sleep :', time.ctime()

‎code/signal_demo.py‎

Lines changed: 16 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -1,18 +1,24 @@
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# coding=utf-8
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# -*- coding: utf-8 -*-
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import time
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import signal
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import os
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import time
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def handle(signo, frame):
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print"Got Signal",signo
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def receive_signal(signum, stack):
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print'Received:', signum
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signal.signal(signal.SIGINT, handle)
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# Unix Only
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signal.alarm(2)
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if __name__ == '__main__':
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now = time.now()
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# Register signal handlers
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signal.signal(signal.SIGUSR1, receive_signal)
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signal.signal(signal.SIGUSR2, receive_signal)
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time.sleep(200)
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# Print the process ID so it can be used with 'kill'
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# to send this program signals.
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print 'My PID is:', os.getpid()
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print "sleep for",time.time() - now," seconds "
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while True:
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print 'Waiting...'
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time.sleep(3)

‎code/signal_exit.py‎

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@@ -0,0 +1,17 @@
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# -*- coding: utf-8 -*-
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import signal
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import os
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def do_exit(sig, stack):
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raise SystemExit('Exiting')
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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signal.signal(signal.SIGUSR1, do_exit)
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print 'My PID:', os.getpid()
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signal.pause() # 当接受到键盘的时候,signal.SIG_IGN给忽略了
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print 'End of Exit'

‎code/signal_official.py‎

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# -*- coding: utf-8 -*-
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import os
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import signal
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# 定义一个信号处理函数,该函数打印收到的信号,然后raise IOError
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def handler(signum, frame):
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print 'Signal handler called with signal', signum
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raise IOError("Couldn't open device!")
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# 对SIGALRM(终止)设置处理的handler, 然后设置定时器,5秒后触发SIGALRM信号
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signal.signal(signal.SIGALRM, handler)
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signal.alarm(5)
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# open 操作可能异常等待
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fd = os.open('/dev/ttys0', os.O_RDWR)
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signal.alarm(0) # 关闭定时器

‎code/signal_show.py‎

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# -*- coding: utf-8 -*-
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import signal
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import os
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import time
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def receive_signal(signum, stack):
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print 'Received:', signum
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def receive_exit(signum, stack):
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print 'Exit'
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raise SystemExit('Exiting')
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if __name__ == '__main__':
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# Register signal handlers
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signal.signal(signal.SIGINT, receive_signal)
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signal.signal(signal.SIGQUIT, receive_signal)
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# SIGSTOP, SIGKILL can't received message
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# signal.signal(signal.SIGSTOP, receive_signal)
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# signal.signal(signal.SIGKILL, receive_exit)
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print 'My PID is:', os.getpid()
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while True:
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print 'Waiting...'
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time.sleep(3)

‎code/signal_timeout.py‎

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# -*- coding: utf-8 -*-
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import signal
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import requests
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def timeoutFn(func, args=(), kwargs={}, timeout_duration=5, default=None):
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class TimeoutError(Exception):
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pass
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def handler(signum, frame):
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raise TimeoutError()
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# set the timeout handler
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signal.signal(signal.SIGALRM, handler)
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signal.alarm(timeout_duration)
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try:
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result = func(*args, **kwargs)
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except TimeoutError as exc:
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result = default
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finally:
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signal.alarm(0)
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signal.signal(signal.SIGALRM, signal.SIG_DFL)
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return result
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if __name__ == '__main__':
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print timeoutFn(requests.get, ("https://baidu.com", ), default='failed')
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print timeoutFn(requests.get, ("https://google.com", ), default='failed')

‎code/signal_traverse.py‎

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# -*- coding: utf-8 -*-
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import signal
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def alarm_received(n, stack):
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return
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signal.signal(signal.SIGALRM, alarm_received)
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# SIG_ING 如果信号被忽略
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# SIG_DFL 如果使用默认行为
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# SIG_IGN -- if the signal is being ignored
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# SIG_DFL -- if the default action for the signal is in effect
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# None -- if an unknown handler is in effect
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# anything else -- the callable Python object used as a handler
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signals_to_names = dict(
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(getattr(signal, n), n)
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for n in dir(signal)
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if n.startswith('SIG') and '_' not in n
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)
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for s, name in sorted(signals_to_names.items()):
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handler = signal.getsignal(s)
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if handler is signal.SIG_DFL:
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handler = 'SIG_DFL'
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elif handler is signal.SIG_IGN:
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handler = 'SIG_IGN'
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print '%-10s (%2d):' % (name, s), handler

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