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/*
* Copyright 2014 by VMware, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of the copyright holder(s)
* and author(s) shall not be used in advertising or otherwise to promote
* the sale, use or other dealings in this Software without prior written
* authorization from the copyright holder(s) and author(s).
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_LIBUDEV
#include <libudev.h>
#include <stdlib.h>
#include <string.h>
#define KERNEL_DEVNAME "VirtualPS/2 VMware VMMouse"
/**
* vmmouse_uses_kernel_driver - Check whether there's an active
* vmmouse driver in the kernel.
*
* Returns 0 if there was no kernel driver found.
* Returns non-zero on error or if there was an active driver found.
*
* Scans the input subsystem for devices matching KERNEL_DEVNAME. These
* devices are assumed to be active vmmouse drivers.
*/
int vmmouse_uses_kernel_driver(void)
{
struct udev *udev;
struct udev_enumerate *enumerate;
struct udev_list_entry *devices, *dev_list_entry;
struct udev_device *dev;
udev = udev_new();
if (!udev)
return 1;
/*
* Udev error return codes that are not caught immediately are
* typically caught in the input argument check in the udev
* function calls following the failing call!
*/
enumerate = udev_enumerate_new(udev);
if (udev_enumerate_add_match_subsystem(enumerate, "input"))
goto out_err;
if (udev_enumerate_scan_devices(enumerate))
goto out_err;
devices = udev_enumerate_get_list_entry(enumerate);
udev_list_entry_foreach(dev_list_entry, devices) {
const char *path, *name;
path = udev_list_entry_get_name(dev_list_entry);
dev = udev_device_new_from_syspath(udev, path);
if (!dev)
goto out_err;
name = udev_device_get_sysattr_value(dev, "name");
if (name && !strcasecmp(name, KERNEL_DEVNAME))
goto out_found;
udev_device_unref(dev);
}
udev_enumerate_unref(enumerate);
udev_unref(udev);
return 0;
out_found:
udev_device_unref(dev);
out_err:
udev_enumerate_unref(enumerate);
udev_unref(udev);
return 1;
}
#else
int vmmouse_uses_kernel_driver(void)
{
return 0;
}
#endif
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