[PATCH bpf-next v2 1/4] libbpf: Implement btf__save_raw()
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STALE1787d
From: Mauricio Vásquez <hidden>
Date: 2021-11-16 16:42:27
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
Implement helper function to save the contents of a BTF object to a file. Signed-off-by: Mauricio Vásquez <redacted> Signed-off-by: Rafael David Tinoco <redacted> Signed-off-by: Lorenzo Fontana <redacted> Signed-off-by: Leonardo Di Donato <redacted> --- tools/lib/bpf/btf.c | 30 ++++++++++++++++++++++++++++++ tools/lib/bpf/btf.h | 2 ++ tools/lib/bpf/libbpf.map | 1 + 3 files changed, 33 insertions(+)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index fadf089ae8fe..96a242f91832 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c@@ -1121,6 +1121,36 @@ struct btf *btf__parse_split(const char *path, struct btf *base_btf) return libbpf_ptr(btf_parse(path, base_btf, NULL)); } +int btf__save_raw(const struct btf *btf, const char *path) +{ + const void *data; + FILE *f = NULL; + __u32 data_sz; + int err = 0; + + data = btf__raw_data(btf, &data_sz); + if (!data) { + err = -ENOMEM; + goto out; + } + + f = fopen(path, "wb"); + if (!f) { + err = -errno; + goto out; + } + + if (fwrite(data, 1, data_sz, f) != data_sz) { + err = -errno; + goto out; + } + +out: + if (f) + fclose(f); + return libbpf_err(err); +} + static void *btf_get_raw_data(const struct btf *btf, __u32 *size, bool swap_endian); int btf__load_into_kernel(struct btf *btf)
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 5c73a5b0a044..4f8d3f303aa6 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h@@ -114,6 +114,8 @@ LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_b LIBBPF_API struct btf *btf__parse_raw(const char *path); LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf); +LIBBPF_API int btf__save_raw(const struct btf *btf, const char *path); + LIBBPF_API struct btf *btf__load_vmlinux_btf(void); LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf); LIBBPF_API struct btf *libbpf_find_kernel_btf(void);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 6a59514a48cf..c9555f8655af 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map@@ -414,4 +414,5 @@ LIBBPF_0.6.0 { perf_buffer__new_deprecated; perf_buffer__new_raw; perf_buffer__new_raw_deprecated; + btf__save_raw; } LIBBPF_0.5.0;
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2.25.1