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Dir : ~/lib/python3/dist-packages/twisted/internet/test/

View File Name : process_helper.py

# A program which exits after starting a child which inherits its
# stdin/stdout/stderr and keeps them open until stdin is closed.

import os
import sys


def grandchild() -> None:
    sys.stdout.write("grandchild started")
    sys.stdout.flush()
    sys.stdin.read()


def main() -> None:
    if sys.argv[1] == "child":
        if sys.argv[2] == "windows":
            import win32api as api
            import win32process as proc

            info = proc.STARTUPINFO()
            info.hStdInput = api.GetStdHandle(api.STD_INPUT_HANDLE)
            info.hStdOutput = api.GetStdHandle(api.STD_OUTPUT_HANDLE)
            info.hStdError = api.GetStdHandle(api.STD_ERROR_HANDLE)
            python = sys.executable
            scriptDir = os.path.dirname(__file__)
            scriptName = os.path.basename(__file__)
            proc.CreateProcess(
                None,
                " ".join((python, scriptName, "grandchild")),
                None,
                None,
                1,
                0,
                os.environ,
                scriptDir,
                info,
            )
        else:
            if os.fork() == 0:
                grandchild()
    else:
        grandchild()


if __name__ == "__main__":
    main()