LIBUDEV(3)                         libudev                        LIBUDEV(3)

NAME         top

       libudev - API for enumerating and introspecting local devices

SYNOPSIS         top

       #include <libudev.h>

       pkg-config --cflags --libs libudev

DESCRIPTION         top

       libudev.h provides APIs to introspect and enumerate devices on the
       local system.

       All functions require a libudev context to operate. This context can
       be create via udev_new(3). It is used to track library state and link
       objects together. No global state is used by libudev, everything is
       always linked to a udev context. Furthermore, multiple different udev
       contexts can be used in parallel by multiple threads. However, a
       single context must not be accessed by multiple threads in parallel.
       The caller is responsible for providing suitable locking if they
       intend to use it from multiple threads.

       To introspect a local device on a system, a udev device object can be
       created via udev_device_new_from_syspath(3) and friends. The device
       object allows one to query current state, read and write attributes
       and lookup properties of the device in question.

       To enumerate local devices on the system, an enumeration object can
       be created via udev_enumerate_new(3).

       To monitor the local system for hotplugged or unplugged devices, a
       monitor can be created via udev_monitor_new_from_netlink(3).

       Whenever libudev returns a list of objects, the udev_list_entry(3)
       API should be used to iterate, access and modify those lists.

       Furthermore, libudev also exports legacy APIs that should not be used
       by new software (and as such are not documented as part of this
       manual). This includes the hardware database known as udev_hwdb
       (please use the new sd-hwdb(3) API instead) and the udev_queue object
       to query the udev daemon (which should not be used by new software at

SEE ALSO         top

       udev_new(3), udev_device_new_from_syspath(3), udev_enumerate_new(3),
       udev_monitor_new_from_netlink(3), udev_list_entry(3), systemd(1),
       sd-device(3), sd-hwdb(3), pkg-config(1)

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug
       report for this manual page, see 
       ⟨⟩.  This
       page was obtained from the project's upstream Git repository 
       ⟨⟩ on 2017-03-13.  If you dis‐
       cover any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

systemd 233                                                       LIBUDEV(3)