UDEV_DEVICE(3) BSD Library Functions Manual UDEV_DEVICE(3)NAME
udev_device_ref, udev_device_unref, udev_device_get_dictionary,
udev_device_get_udev, udev_device_get_action, udev_device_get_devnum,
udev_device_get_devnode, udev_device_get_driver,
udev_device_get_subsystem, udev_device_get_kptr, udev_device_get_major,
udev_device_get_minor, udev_device_get_property_value — udev device func‐
tions
LIBRARY
library “libdevattr”
SYNOPSIS
#include <devattr.h>
struct udev_device *
udev_device_ref(struct udev_device *udev_device);
void
udev_device_unref(struct udev_device *udev_device);
struct udev *
udev_device_get_udev(struct udev_device *udev_device);
prop_dictionary_t
udev_device_get_dictionary(struct udev_device *udev_device);
const char *
udev_device_get_action(struct udev_device *udev_device);
dev_t
udev_device_get_devnum(struct udev_device *udev_device);
const char *
udev_device_get_devnode(struct udev_device *udev_device);
const char *
udev_device_get_driver(struct udev_device *udev_device);
const char *
udev_device_get_subsystem(struct udev_device *udev_device);
uint64_t
udev_device_get_kptr(struct udev_device *udev_device);
int32_t
udev_device_get_major(struct udev_device *udev_device);
int32_t
udev_device_get_minor(struct udev_device *udev_device);
const char *
udev_device_get_property_value(struct udev_device *udev_device,
const char *key);
DESCRIPTION
The udev_device_ref() and udev_device_unref() functions increase or
decrease the reference count on a udev_device object respectively. When
the reference count drops to 0, the object is automatically destroyed.
The udev_device_ref() function returns the same object that was passed
in.
The udev_device_get_udev() function returns the udev context in which the
udev_device was created.
The udev_device_get_dictionary() function returns the raw
prop_dictionary(3) dictionary associated to the given udev_device. It
returns NULL when no dictionary is associated to the device.
The udev_device_get_action() function returns the action, as a string,
related to the udev_device. Possible actions are "add" for attach
events, "remove" for detach events and "none" if the udev_device is not
associated with a particular event.
The udev_device_get_devnum(), udev_device_get_devnode(),
udev_device_get_driver(), udev_device_get_subsystem(),
udev_device_get_kptr(), udev_device_get_major() and
udev_device_get_minor() function return some information of the device
corresponding to the udev_device. The udev_device_get_devnum(), function
returns the device number. The udev_device_get_devnode() function
returns the full path in the system to the given device. The returned
string and errno are the same as for the devname(3) function. The
udev_device_get_driver() and udev_device_get_subsystem() functions return
the driver name and subsystem of the device if available. Otherwise they
return NULL. The udev_device_get_kptr(), udev_device_get_major() and
udev_device_get_minor() functions return the kernel pointer to the asso‐
ciated cdev_t, the major and the minor number, respectively.
The udev_device_get_property_value() function returns the value for the
udev_device for the specified property key. It returns NULL if the spec‐
ified udev_device has no property for key.
SEE ALSOdevattr(3), udev(3), udev_enumerate(3), udev_monitor(3), udevd(8)BSD July 11, 2010 BSD
