1LIBUDEV(3)                          libudev                         LIBUDEV(3)
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NAME

6       libudev - API for enumerating and introspecting local devices
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SYNOPSIS

9       #include <libudev.h>
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11       pkg-config --cflags --libs libudev
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DESCRIPTION

14       libudev.h provides APIs to introspect and enumerate devices on the
15       local system.
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17       All functions require a libudev context to operate. This context can be
18       create via udev_new(3). It is used to track library state and link
19       objects together. No global state is used by libudev, everything is
20       always linked to a udev context. Furthermore, multiple different udev
21       contexts can be used in parallel by multiple threads. However, a single
22       context must not be accessed by multiple threads in parallel. The
23       caller is responsible for providing suitable locking if they intend to
24       use it from multiple threads.
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26       To introspect a local device on a system, a udev device object can be
27       created via udev_device_new_from_syspath(3) and friends. The device
28       object allows one to query current state, read and write attributes and
29       lookup properties of the device in question.
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31       To enumerate local devices on the system, an enumeration object can be
32       created via udev_enumerate_new(3).
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34       To monitor the local system for hotplugged or unplugged devices, a
35       monitor can be created via udev_monitor_new_from_netlink(3).
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37       Whenever libudev returns a list of objects, the udev_list_entry(3) API
38       should be used to iterate, access and modify those lists.
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40       Furthermore, libudev also exports legacy APIs that should not be used
41       by new software (and as such are not documented as part of this
42       manual). This includes the hardware database known as udev_hwdb (please
43       use the new sd-hwdb(3) API instead) and the udev_queue object to query
44       the udev daemon (which should not be used by new software at all).
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SEE ALSO

47       udev_new(3), udev_device_new_from_syspath(3), udev_enumerate_new(3),
48       udev_monitor_new_from_netlink(3), udev_list_entry(3), systemd(1), sd-
49       device(3), sd-hwdb(3), pkg-config(1)
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53systemd 239                                                         LIBUDEV(3)
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