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45 lines
1.3 KiB
45 lines
1.3 KiB
# -*- coding: utf-8 -
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#
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# This file is part of gunicorn released under the MIT license.
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# See the NOTICE for more information.
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import os
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SD_LISTEN_FDS_START = 3
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def listen_fds(unset_environment=True):
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"""
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Get the number of sockets inherited from systemd socket activation.
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:param unset_environment: clear systemd environment variables unless False
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:type unset_environment: bool
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:return: the number of sockets to inherit from systemd socket activation
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:rtype: int
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Returns zero immediately if $LISTEN_PID is not set to the current pid.
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Otherwise, returns the number of systemd activation sockets specified by
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$LISTEN_FDS.
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When $LISTEN_PID matches the current pid, unsets the environment variables
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unless the ``unset_environment`` flag is ``False``.
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.. note::
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Unlike the sd_listen_fds C function, this implementation does not set
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the FD_CLOEXEC flag because the gunicorn arbiter never needs to do this.
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.. seealso::
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`<https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html>`_
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"""
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fds = int(os.environ.get('LISTEN_FDS', 0))
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listen_pid = int(os.environ.get('LISTEN_PID', 0))
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if listen_pid != os.getpid():
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return 0
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if unset_environment:
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os.environ.pop('LISTEN_PID', None)
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os.environ.pop('LISTEN_FDS', None)
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return fds
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