Commit 5fbc2208 authored May 09, 2020 by Yonghong Song Committed by Alexei Starovoitov May 09, 2020

tools/libpf: Add offsetof/container_of macro in bpf_helpers.h



These two helpers will be used later in bpf_iter bpf program
bpf_iter_netlink.c. Put them in bpf_helpers.h since they could
be useful in other cases.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200509175919.2477104-1-yhs@fb.com

parent c09add2f

tools/lib/bpf/bpf_helpers.h

+14 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,20 @@
		#define __weak __attribute__((weak))
		#endif

		/*
		* Helper macro to manipulate data structures
		*/
		#ifndef offsetof
		#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
		#endif
		#ifndef container_of
		#define container_of(ptr, type, member) \
		({ \
		void __mptr = (void )(ptr); \
		((type *)(__mptr - offsetof(type, member))); \
		})
		#endif

		/*
		* Helper structure used by eBPF C program
		* to describe BPF map attributes to libbpf loader

Admin message