[docs] [issue13368] Possible problem in documentation of module subprocess, method send_signal

[Eryk Sun]

Eryk Sun added the comment:

You can send CTRL_C_EVENT to a process group. But it requires the group leader to manually enable Ctrl+C handling. Initially it's disabled when creating a process with CREATE_NEW_PROCESS_GROUP. 

The attached script demonstrates sending CTRL_C_EVENT to a process group. The child process is the group leader, so CTRL+C event processing has to be manually enabled in it by calling SetConsoleCtrlHandler(NULL, FALSE). This flag gets inherited by the grandchild process. Example output:

    Process 0300: created process 0464
    Process 0464: created process 0456
    Process 0464: received CTRL+C
    Process 0456: received CTRL+C

That said, given that MSDN [erroneously] claims that this isn't possible, probably the subprocess docs should only mention sending CTRL_BREAK_EVENT.

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nosy: +eryksun
versions: +Python 3.4, Python 3.5, Python 3.6 -Python 3.2, Python 3.3
Added file: http://bugs.python.org/file41242/proc_group_ctrl_c.py

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