Created
July 15, 2014 21:40
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An example how in python on linux you can ensure that a signal gets passed to a child on its parent's death
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| #!/usr/bin/env python | |
| from prctl import prctl, PDEATHSIG # https://pypi.python.org/pypi/prctl/1.0.1 | |
| import signal as sig | |
| import subprocess | |
| p = subprocess.Popen(['yes'], preexec_fn=lambda: prctl(PDEATHSIG, sig.SIGTERM)) | |
| p.communicate() |
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Running deathsig will start 'yes' which just echoes 'y' forever. Without the preexec_fn, killing deathsig results in yes being reparented to init and continuing to run indefinitely. With it, SIGTERM is sent to the 'yes' child process on parent death, allowing it to terminate.