This is a mirror of [bpf-next linux tree](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next)'s
`tools/lib/bpf` directory plus its supporting header files.

The following files will by sync'ed with bpf-next repo:
  - `src/` <-> `bpf-next/tools/lib/bpf/`
  - `include/uapi/linux/bpf_common.h` <-> `bpf-next/tools/include/uapi/linux/bpf_common.h`
  - `include/uapi/linux/bpf.h` <-> `bpf-next/tools/include/uapi/linux/bpf.h`
  - `include/uapi/linux/btf.h` <-> `bpf-next/tools/include/uapi/linux/btf.h`
  - `include/uapi/linux/if_link.h` <-> `bpf-next/tools/include/uapi/linux/if_link.h`
  - `include/uapi/linux/if_xdp.h` <-> `bpf-next/tools/include/uapi/linux/if_xdp.h`
  - `include/uapi/linux/netlink.h` <-> `bpf-next/tools/include/uapi/linux/netlink.h`
  - `include/tools/libc_compat.h` <-> `bpf-next/tools/include/tools/libc_compat.h`

Other header files at this repo (`include/linux/*.h`) are reduced versions of
their counterpart files at bpf-next's `tools/include/linux/*.h` to make compilation
successful.

Build
[![Build Status](https://travis-ci.org/libbpf/libbpf.svg?branch=master)](https://travis-ci.org/libbpf/libbpf)
[![Total alerts](https://img.shields.io/lgtm/alerts/g/libbpf/libbpf.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/libbpf/libbpf/alerts/)
[![Coverity](https://img.shields.io/coverity/scan/18195.svg)](https://scan.coverity.com/projects/libbpf)
=====
libelf is an internal dependency of libbpf and thus it is required to link
against and must be installed on the system for applications to work.
pkg-config is used by default to find libelf, and the program called can be
overridden with `PKG_CONFIG`.
If using `pkg-config` at build time is not desired, it can be disabled by setting
`NO_PKG_CONFIG=1` when calling make.

To build both static libbpf.a and shared libbpf.so:
```bash
$ cd src
$ make
```

To build only static libbpf.a library in directory
build/ and install them together with libbpf headers in a staging directory
root/:
```bash
$ cd src
$ mkdir build root
$ BUILD_STATIC_ONLY=y OBJDIR=build DESTDIR=root make install
```

To build both static libbpf.a and shared libbpf.so against a custom libelf
dependency installed in /build/root/ and install them together with libbpf
headers in a build directory /build/root/:
```bash
$ cd src
$ PKG_CONFIG_PATH=/build/root/lib64/pkgconfig DESTDIR=/build/root make install
```

Distributions
=====

Distributions packaging libbpf from this mirror:
  - [Fedora](https://src.fedoraproject.org/rpms/libbpf)
  - [Gentoo](https://packages.gentoo.org/packages/dev-libs/libbpf)

Benefits of packaging from the mirror over packaging from kernel sources:
  - Consistent versioning across distributions.
  - No ties to any specific kernel, transparent handling of older kernels.
    Libbpf is designed to be kernel-agnostic and work across multitude of kernel
    versions. It has built-in mechanisms to gracefully handle older kernels,
    that are missing some of the features, by working around or gracefully
    degrading functionality. Thus libbpf is not tied to a specific kernel
    version and can/should be packaged and versioned independently.
  - Continuous integration testing via [TravisCI](https://travis-ci.org/libbpf/libbpf).
  - Static code analysis via [LGTM](https://lgtm.com/projects/g/libbpf/libbpf) and [Coverity](https://scan.coverity.com/projects/libbpf).

Package dependencies of libbpf, package names may vary across distros:
  - zlib
  - libelf

License
=====

This work is dual-licensed under BSD 2-clause license and GNU LGPL v2.1 license.
You can choose between one of them if you use this work.

`SPDX-License-Identifier: BSD-2-Clause OR LGPL-2.1`