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How to use on_fork method in autotest

Best Python code snippet using autotest_python

fork.py

Source:fork.py

...112            handle_child_crash()113    def _child_main(self, childfp):114        reset_logging_framework()  # Must be first!115        fixup_prngs()116        mitogen.core.Latch._on_fork()117        mitogen.core.Side._on_fork()118        if self.on_fork:119            self.on_fork()120        mitogen.core.set_block(childfp.fileno())121        # Expected by the ExternalContext.main().122        os.dup2(childfp.fileno(), 1)123        os.dup2(childfp.fileno(), 100)124        # Overwritten by ExternalContext.main(); we must replace the125        # parent-inherited descriptors that were closed by Side._on_fork() to126        # avoid ExternalContext.main() accidentally allocating new files over127        # the standard handles.128        os.dup2(childfp.fileno(), 0)129        # Avoid corrupting the stream on fork crash by dupping /dev/null over130        # stderr. Instead, handle_child_crash() uses /dev/tty to log errors.131        devnull = os.open('/dev/null', os.O_WRONLY)132        if devnull != 2:133            os.dup2(devnull, 2)134            os.close(devnull)135        # If we're unlucky, childfp.fileno() may coincidentally be one of our136        # desired FDs. In that case closing it breaks ExternalContext.main().137        if childfp.fileno() not in (0, 1, 100):138            childfp.close()139        config = self.get_econtext_config()...

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