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""" Advanced signal (e.g. ctrl+C) handling for IPython
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So far, this only ignores ctrl + C in IPython file a subprocess
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is executing, to get closer to how a "proper" shell behaves.
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Other signal processing may be implemented later on.
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If _ip.options.verbose is true, show exit status if nonzero
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"""
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import signal,os,sys
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from IPython.core import ipapi
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import subprocess
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ip = ipapi.get()
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def new_ipsystem_posix(cmd):
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""" ctrl+c ignoring replacement for system() command in iplib.
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Ignore ctrl + c in IPython process during the command execution.
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The subprocess will still get the ctrl + c signal.
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posix implementation
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"""
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p = subprocess.Popen(cmd, shell = True)
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old_handler = signal.signal(signal.SIGINT, signal.SIG_IGN)
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pid,status = os.waitpid(p.pid,0)
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signal.signal(signal.SIGINT, old_handler)
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if status and ip.options.verbose:
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print "[exit status: %d]" % status
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def new_ipsystem_win32(cmd):
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""" ctrl+c ignoring replacement for system() command in iplib.
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Ignore ctrl + c in IPython process during the command execution.
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The subprocess will still get the ctrl + c signal.
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win32 implementation
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"""
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old_handler = signal.signal(signal.SIGINT, signal.SIG_IGN)
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status = os.system(cmd)
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signal.signal(signal.SIGINT, old_handler)
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if status and ip.options.verbose:
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print "[exit status: %d]" % status
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def init():
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o = ip.options
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try:
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o.verbose
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except AttributeError:
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o.allow_new_attr (True )
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o.verbose = 0
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ip.system = (sys.platform == 'win32' and new_ipsystem_win32 or
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new_ipsystem_posix)
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init()
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