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UDEV(3)               DragonFly 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

     Device attribute and event library (libdevattr, -ldevattr)


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
     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)

DragonFly 5.5                    July 11, 2010                   DragonFly 5.5

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