UDEV(3) BSD Library Functions Manual UDEV(3)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
The udev_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 refer‐
ence 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 ALSOdevattr(3), udev_device(3), udev_enumerate(3), udev_monitor(3), udevd(8)BSD July 11, 2010 BSD
