105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
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/*
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* Copyright 2014 by VMware, 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 shall be included in
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* all copies or substantial portions of the 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of the copyright holder(s)
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* and author(s) shall not be used in advertising or otherwise to promote
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* the sale, use or other dealings in this Software without prior written
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* authorization from the copyright holder(s) and author(s).
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_LIBUDEV
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#include <libudev.h>
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#include <stdlib.h>
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#include <string.h>
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#define KERNEL_DEVNAME "VirtualPS/2 VMware VMMouse"
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/**
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* vmmouse_uses_kernel_driver - Check whether there's an active
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* vmmouse driver in the kernel.
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*
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* Returns 0 if there was no kernel driver found.
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* Returns non-zero on error or if there was an active driver found.
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*
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* Scans the input subsystem for devices matching KERNEL_DEVNAME. These
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* devices are assumed to be active vmmouse drivers.
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*/
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int vmmouse_uses_kernel_driver(void)
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{
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struct udev *udev;
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struct udev_enumerate *enumerate;
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struct udev_list_entry *devices, *dev_list_entry;
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struct udev_device *dev;
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udev = udev_new();
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if (!udev)
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return 1;
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/*
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* Udev error return codes that are not caught immediately are
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* typically caught in the input argument check in the udev
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* function calls following the failing call!
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*/
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enumerate = udev_enumerate_new(udev);
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if (udev_enumerate_add_match_subsystem(enumerate, "input"))
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goto out_err;
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if (udev_enumerate_scan_devices(enumerate))
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goto out_err;
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devices = udev_enumerate_get_list_entry(enumerate);
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udev_list_entry_foreach(dev_list_entry, devices) {
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const char *path, *name;
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path = udev_list_entry_get_name(dev_list_entry);
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dev = udev_device_new_from_syspath(udev, path);
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if (!dev)
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goto out_err;
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name = udev_device_get_sysattr_value(dev, "name");
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if (name && !strcasecmp(name, KERNEL_DEVNAME))
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goto out_found;
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udev_device_unref(dev);
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}
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udev_enumerate_unref(enumerate);
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udev_unref(udev);
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return 0;
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out_found:
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udev_device_unref(dev);
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out_err:
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udev_enumerate_unref(enumerate);
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udev_unref(udev);
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return 1;
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}
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#else
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int vmmouse_uses_kernel_driver(void)
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{
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return 0;
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}
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#endif
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