在Windows的python 2.7中,根据文档,您可以发送CTRL_C_EVENT
(Python 2.7 Subprocess Popen.send_signal documentation).
但是,当我尝试它时,我在子进程中没有收到预期的键盘中断。
这是父流程的示例代码:
# FILE : parentProcess.py
import subprocess
import time
import signal
CREATE_NEW_PROCESS_GROUP = 512
process = subprocess.Popen(['python', '-u', 'childProcess.py'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True,
creationflags=CREATE_NEW_PROCESS_GROUP)
print "pid = ", process.pid
index = 0
maxLoops = 15
while index < maxLoops:
index += 1
# Send one message every 0.5 seconds
time.sleep(0.5)
# Send data to the subprocess
process.stdin.write('Bar\n')
# Read data from the subprocess
temp = process.stdout.readline()
print temp,
if (index == 10):
# Send Keyboard Interrupt
process.send_signal(signal.CTRL_C_EVENT)
这是 child 程序的示例代码:
# FILE : childProcess.py
import sys
while True:
try:
# Get data from main process
temp = sys.stdin.readline()
# Write data out
print 'Foo ' + temp,
except KeyboardInterrupt:
print "KeyboardInterrupt"
如果我运行文件parentProcess.py,我希望获得“Foo Bar”十次,然后获得“KeyboardInterrupt”,随后是“Foo Bar” 4次,但是获得“Foo Bar” 15次。
有没有办法使CTRL_C_EVENT像键盘SIGINT在Linux中一样表现为键盘中断?
经过阅读后,我发现一些信息似乎与CTRL_C_EVENT的python文档相矛盾,特别是它说
以下站点提供有关创建标志的更多信息:
Process Creation Flags.
最佳答案
这种由子进程进行信号处理的方法在Linux和Windows 2008上都适用,都使用Python 2.7.2,但它使用Ctrl-Break而不是Ctrl-C。请参阅http://msdn.microsoft.com/en-us/library/ms683155%28v=vs.85%29.aspx中有关进程组和Ctrl-C的注释。
catcher.py:
import os
import signal
import sys
import time
def signal_handler(signal, frame):
print 'catcher: signal %d received!' % signal
raise Exception('catcher: i am done')
if hasattr(os.sys, 'winver'):
signal.signal(signal.SIGBREAK, signal_handler)
else:
signal.signal(signal.SIGTERM, signal_handler)
print 'catcher: started'
try:
while(True):
print 'catcher: sleeping...'
time.sleep(1)
except Exception as ex:
print ex
sys.exit(0)
thrower.py:
import signal
import subprocess
import time
import os
args = [
'python',
'catcher.py',
]
print 'thrower: starting catcher'
if hasattr(os.sys, 'winver'):
process = subprocess.Popen(args, creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)
else:
process = subprocess.Popen(args)
print 'thrower: waiting a couple of seconds for catcher to start...'
time.sleep(2)
print 'thrower: sending signal to catch'
if hasattr(os.sys, 'winver'):
os.kill(process.pid, signal.CTRL_BREAK_EVENT)
else:
process.send_signal(signal.SIGTERM)
print 'thrower: i am done'
关于python - 在Windows中使用子过程Popen.send_signal(CTRL_C_EVENT)时如何获得期望的结果?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/5033277/