DragonFly On-Line Manual Pages

Search: Section:  

UDEV_DEVICE(3)        DragonFly 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
     functions


LIBRARY

     Device attribute and event library (libdevattr, -ldevattr)


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
     associated 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
     specified udev_device has no property for key.


SEE ALSO

     devattr(3), udev(3), udev_enumerate(3), udev_monitor(3), udevd(8)

DragonFly 5.5                    July 11, 2010                   DragonFly 5.5

Search: Section: