NAME
udev_new,
udev_ref, udev_unref,
udev_get_dev_path,
udev_set_userdata,
udev_get_userdata —
general udev functions
LIBRARY
library “libdevattr”
SYNOPSIS
#include
<devattr.h>
struct udev *
udev_new(void);
struct udev *
udev_ref(struct
udev *udev_ctx);
void
udev_unref(struct
udev *udev_ctx);
const char *
udev_get_dev_path(struct
udev *udev_ctx);
void
udev_set_userdata(struct
udev *udev_ctx, void
*userdata);
void *
udev_get_userdata(struct
udev *udev_ctx);
DESCRIPTION
Theudev_new()
function returns a new udev context. This is needed as a context for all other
libdevattr functions. The returned context has a refcount of 1. This function
returns NULL if no udev context could be created,
which usually happens when the udevd daemon is not running.
The
udev_ref()
and
udev_unref()
functions increase or decrease the reference count on a udev object
respectively. When the reference count drops to 0, the object is
automatically destroyed. The udev_ref() function
returns the same object that was passed in.
The
udev_get_dev_path()
function returns the path to the system device directory.
The
udev_set_userdata()
function allows the consumer to associate some
userdata to the specified
udev_ctx. The
udev_get_userdata()
function returns the currently associated user data.
SEE ALSO
devattr(3), udev_device(3), udev_enumerate(3), udev_monitor(3), udevd(8)