libbpf

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Andrey Ignatov db1adc8658 Add symlinks for DSO

Add symlinks with version suffix in a way similar to how it's done in
kernel tree.

The differences with kernel tree version:

* LIBS is used to handle both files and targets w/o separation;

* Version symlink is created in corresponding target as opposed to do
  everything in libbpf.so.$(LIBBPF_VERSION).

Example:

  % OBJDIR=build DESTDIR=root make install
  ...
  % find root/ ! -type d -exec ls -l {} +
  -rw-r--r--. 1 rdna users   6046 Apr  2 18:09 root/usr/include/bpf/bpf.h
  -rw-r--r--. 1 rdna users   3485 Apr  2 18:09 root/usr/include/bpf/btf.h
  -rw-r--r--. 1 rdna users  16454 Apr  2 18:09 root/usr/include/bpf/libbpf.h
  -rw-r--r--. 1 rdna users 602030 Apr  2 18:09 root/usr/lib64/libbpf.a
  lrwxrwxrwx. 1 rdna users     11 Apr  2 18:09 root/usr/lib64/libbpf.so -> libbpf.so.0
  lrwxrwxrwx. 1 rdna users     15 Apr  2 18:09 root/usr/lib64/libbpf.so.0 -> libbpf.so.0.0.2
  -rwxr-xr-x. 1 rdna users 377640 Apr  2 18:09 root/usr/lib64/libbpf.so.0.0.2
  -rw-r--r--. 1 rdna users    241 Apr  2 18:09 root/usr/lib64/pkgconfig/libbpf.pc

Signed-off-by: Andrey Ignatov <rdna@fb.com>

2019-04-02 18:37:19 -07:00

include

bpf: Sync bpf.h to tools

2019-03-28 19:51:55 -07:00

scripts

scripts/sync_kernel.sh: skip empty merges, preventing cherry-picking

2019-03-28 19:51:11 -07:00

src

Add symlinks for DSO

2019-04-02 18:37:19 -07:00

CHECKPOINT-COMMIT

sync: latest libbpf changes from kernel

2019-03-28 19:51:55 -07:00

README

Makefile: use pkg-config to get libelf flags

2019-03-29 17:37:54 +00:00

README

This is a mirror of bpf-next linux tree
(https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next)
bpf-next/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/tools/include/linux/*.h to make compilation
successful.

Build
=====
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:
  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/:
  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/:

  cd src
  PKG_CONFIG_PATH=/build/root/lib64/pkgconfig DESTDIR=/build/root make install