Name
udev_device_get_syspath, udev_device_get_sysname, udev_device_get_sysnum, udev_device_get_devpath, udev_device_get_devnode, udev_device_get_devnum, udev_device_get_devtype, udev_device_get_subsystem, udev_device_get_driver, udev_device_get_udev, udev_device_get_parent, udev_device_get_parent_with_subsystem_devtype, udev_device_get_is_initialized, udev_device_get_action — Query device properties
Synopsis
#include <libudev.h>
const char *udev_device_get_syspath( | struct udev_device *udev_device); |
const char *udev_device_get_sysname( | struct udev_device *udev_device); |
const char *udev_device_get_sysnum( | struct udev_device *udev_device); |
const char *udev_device_get_devpath( | struct udev_device *udev_device); |
const char *udev_device_get_devnode( | struct udev_device *udev_device); |
dev_t udev_device_get_devnum( | struct udev_device *udev_device); |
const char *udev_device_get_devtype( | struct udev_device *udev_device); |
const char *udev_device_get_subsystem( | struct udev_device *udev_device); |
const char *udev_device_get_driver( | struct udev_device *udev_device); |
struct udev *udev_device_get_udev( | struct udev_device *udev_device); |
struct udev_device *udev_device_get_parent( | struct udev_device *udev_device); |
struct udev_device *udev_device_get_parent_with_subsystem_devtype( | struct udev_device *udev_device, |
| | const char *subsystem, |
| | const char *devtype); |
int udev_device_get_is_initialized( | struct udev_device *udev_device); |
const char *udev_device_get_action( | struct udev_device *udev_device); |
Return Value
On success, udev_device_get_syspath(),
udev_device_get_sysname(),
udev_device_get_sysnum(),
udev_device_get_devpath(),
udev_device_get_devnode(),
udev_device_get_devtype(),
udev_device_get_subsystem(),
udev_device_get_driver() and
udev_device_get_action() return a pointer
to a constant string that describes the requested property. The
lifetime of this string is bound to the device it was requested
on. On failure, each function may return
NULL.
On success, udev_device_get_devnum()
returns the device type of the passed device. On failure, a
device type with minor and major number set to
0 is returned.
udev_device_get_udev() always returns
a valid pointer to the udev context that this device belongs
to.
On success, udev_device_get_parent()
and
udev_device_get_parent_with_subsystem_devtype()
return a pointer to the parent device. No additional reference
to this device is acquired, but the child device owns a reference
to such a parent device. On failure, NULL
is returned.
On success, udev_device_get_is_initialized() returns either 1 or
0, depending on whether the passed device has already been initialized by udev or not. On
failure, a negative error code is returned. Note that devices for which no udev rules are defined are never
reported initialized.