15460eaed2
We can only request one fd per device from systemd-logind. If a fd is re-used by the same device, releasing the fd from one device doesn't mean we can close it. The systemd code knows when it's really released, so let it close the fd. Test case: xorg.conf section for an input device with hotplugging enabled. evdev detects the duplicate and closes the hotplugged device, which closes the fd. The other instance of evdev thinks the fd is still valid so now you're playing a double lottery. First, which client(s) will get the evdev fd? Second, which requests will be picked up by evdev and which ones will be picked up by the client? You'll never know, but the fun is in finding out. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
/*
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* Copyright © 2013 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Author: Hans de Goede <hdegoede@redhat.com>
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*/
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#ifndef SYSTEMD_LOGIND_H
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#define SYSTEMD_LOGIND_H
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#ifdef SYSTEMD_LOGIND
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int systemd_logind_init(void);
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void systemd_logind_fini(void);
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int systemd_logind_take_fd(int major, int minor, const char *path, Bool *paus);
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void systemd_logind_release_fd(int major, int minor, int fd);
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int systemd_logind_controls_session(void);
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void systemd_logind_vtenter(void);
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#else
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#define systemd_logind_init()
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#define systemd_logind_fini()
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#define systemd_logind_take_fd(major, minor, path, paus) -1
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#define systemd_logind_release_fd(major, minor, fd) close(fd)
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#define systemd_logind_controls_session() 0
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#define systemd_logind_vtenter()
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#endif
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#endif
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