libbpf: add raw tracepoint attach API (84bf5e1f) · Commits · 戴 / test

tools/lib/bpf/libbpf.c

+39 −0

Original line number	Diff line number	Diff line
		@@ -4269,6 +4269,45 @@ struct bpf_link bpf_program__attach_tracepoint(struct bpf_program prog,
		return link;
		}

		static int bpf_link__destroy_fd(struct bpf_link *link)
		{
		struct bpf_link_fd l = (void )link;

		return close(l->fd);
		}

		struct bpf_link bpf_program__attach_raw_tracepoint(struct bpf_program prog,
		const char *tp_name)
		{
		char errmsg[STRERR_BUFSIZE];
		struct bpf_link_fd *link;
		int prog_fd, pfd;

		prog_fd = bpf_program__fd(prog);
		if (prog_fd < 0) {
		pr_warning("program '%s': can't attach before loaded\n",
		bpf_program__title(prog, false));
		return ERR_PTR(-EINVAL);
		}

		link = malloc(sizeof(*link));
		if (!link)
		return ERR_PTR(-ENOMEM);
		link->link.destroy = &bpf_link__destroy_fd;

		pfd = bpf_raw_tracepoint_open(tp_name, prog_fd);
		if (pfd < 0) {
		pfd = -errno;
		free(link);
		pr_warning("program '%s': failed to attach to raw tracepoint '%s': %s\n",
		bpf_program__title(prog, false), tp_name,
		libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
		return ERR_PTR(pfd);
		}
		link->fd = pfd;
		return (struct bpf_link *)link;
		}

		enum bpf_perf_event_ret
		bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size,
		void *copy_mem, size_t copy_size,

+3 −0

Original line number	Diff line number	Diff line
		@@ -182,6 +182,9 @@ LIBBPF_API struct bpf_link *
		bpf_program__attach_tracepoint(struct bpf_program *prog,
		const char *tp_category,
		const char *tp_name);
		LIBBPF_API struct bpf_link *
		bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
		const char *tp_name);

		struct bpf_insn;

+1 −0

Original line number	Diff line number	Diff line
		@@ -171,6 +171,7 @@ LIBBPF_0.0.4 {
		bpf_object__load_xattr;
		bpf_program__attach_kprobe;
		bpf_program__attach_perf_event;
		bpf_program__attach_raw_tracepoint;
		bpf_program__attach_tracepoint;
		bpf_program__attach_uprobe;
		btf_dump__dump_type;