eryksun added the comment:
> it only works if the the target process id is 0 and then it
> generates the signal in all processes that share the console.
You can target a process group, which is a subset of the console's attached
processes. That's why the console host, conhost.exe, routes dispatching the
event through the session CSRSS.EXE, which handles bookkeeping of Windows
processes and threads, including groups.
CSRSS creates a thread in each target, which starts at kernel32!CtrlRoutine. If
a process is being debugged this routine raises a DBG_CONTROL_C or
DBG_CONTROL_BREAK exception. Next it calls the registered handlers. The default
handler, if called, exits the process with the exit code set to
STATUS_CONTROL_C_EXIT (0xC000013A):
0:000> u kernel32!DefaultHandler l3
kernel32!DefaultHandler:
00000000`76f31290 4883ec28 sub rsp,28h
00000000`76f31294 b93a0100c0 mov ecx,0C000013Ah
00000000`76f31299 ff15e1bb0500 call qword ptr
[kernel32!
_imp_RtlExitUserProcess
(00000000`76f8ce80)]
Example:
import os
import sys
import signal
import subprocess
import threading
STATUS_CONTROL_C_EXIT = 0xC000013A
p = subprocess.Popen([sys.executable, '-i'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)
p.stderr.read(1) # poor man's WaitForInputIdle
os.kill(p.pid, signal.CTRL_BREAK_EVENT)
watchdog = threading.Timer(5, p.terminate)
watchdog.start()
exitcode = p.wait()
watchdog.cancel()
if exitcode < 0:
exitcode += 2 ** 32
assert exitcode == STATUS_CONTROL_C_EXIT
----------
nosy: +eryksun
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<http://bugs.python.org/issue23948>
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