From: Daira Hopwood Date: Tue, 21 Oct 2014 17:36:11 +0000 (+0100) Subject: Improve a comment to take Windows into account. X-Git-Url: https://git.rkrishnan.org/(%5B%5E?a=commitdiff_plain;h=refs%2Fheads%2F1159-notac-3;p=tahoe-lafs%2Ftahoe-lafs.git Improve a comment to take Windows into account. Signed-off-by: Daira Hopwood --- diff --git a/src/allmydata/scripts/startstop_node.py b/src/allmydata/scripts/startstop_node.py index e1b5f641..710f79dc 100644 --- a/src/allmydata/scripts/startstop_node.py +++ b/src/allmydata/scripts/startstop_node.py @@ -125,25 +125,31 @@ def start(config, out=sys.stdout, err=sys.stderr): return 1 twistd_config.loadedPlugins = {"StartTahoeNode": StartTahoeNodePlugin(nodetype, basedir)} - # Unless --nodaemon was provided, the twistd.runApp() below spawns off a - # child process, and the parent calls os._exit(0), so there's no way for - # us to get control afterwards, even with 'except SystemExit'. If - # application setup fails (e.g. ImportError), runApp() will raise an - # exception. + # On Unix-like platforms: + # Unless --nodaemon was provided, the twistd.runApp() below spawns off a + # child process, and the parent calls os._exit(0), so there's no way for + # us to get control afterwards, even with 'except SystemExit'. If + # application setup fails (e.g. ImportError), runApp() will raise an + # exception. # - # So if we wanted to do anything with the running child, we'd have two - # options: + # So if we wanted to do anything with the running child, we'd have two + # options: # - # * fork first, and have our child wait for the runApp() child to get - # running. (note: just fork(). This is easier than fork+exec, since we - # don't have to get PATH and PYTHONPATH set up, since we're not - # starting a *different* process, just cloning a new instance of the - # current process) - # * or have the user run a separate command some time after this one - # exits. + # * fork first, and have our child wait for the runApp() child to get + # running. (note: just fork(). This is easier than fork+exec, since we + # don't have to get PATH and PYTHONPATH set up, since we're not + # starting a *different* process, just cloning a new instance of the + # current process) + # * or have the user run a separate command some time after this one + # exits. # - # For Tahoe, we don't need to do anything with the child, so we can just - # let it exit. + # For Tahoe, we don't need to do anything with the child, so we can just + # let it exit. + # + # On Windows: + # twistd does not fork; it just runs in the current process whether or not + # --nodaemon is specified. (As on Unix, --nodaemon does have the side effect + # of causing us to log to stdout/stderr.) if "--nodaemon" in twistd_args or sys.platform == "win32": verb = "running"