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.
History
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()
, and
udev_device_get_action()
were added in version 221.