summaryrefslogtreecommitdiff
path: root/tools/bpf/bpftool/btf.c
diff options
context:
space:
mode:
authorTianyi Liu <i.pear@outlook.com>2022-09-28 11:09:32 +0300
committerAndrii Nakryiko <andrii@kernel.org>2022-10-01 01:40:46 +0300
commit3ca2fb497440a3c8294f9df0ce7b2c3c9a1c5875 (patch)
tree7ef24febc2a8323e03331e137d3b42c9ded065d8 /tools/bpf/bpftool/btf.c
parent51e05a8cf8eb34da7473823b7f236a77adfef0b4 (diff)
downloadlinux-3ca2fb497440a3c8294f9df0ce7b2c3c9a1c5875.tar.xz
bpftool: Fix error message of strerror
strerror() expects a positive errno, however variable err will never be positive when an error occurs. This causes bpftool to output too many "unknown error", even a simple "file not exist" error can not get an accurate message. This patch fixed all "strerror(err)" patterns in bpftool. Specially in btf.c#L823, hashmap__append() is an internal function of libbpf and will not change errno, so there's a little difference. Some libbpf_get_error() calls are kept for return values. Changes since v1: https://lore.kernel.org/bpf/SY4P282MB1084B61CD8671DFA395AA8579D539@SY4P282MB1084.AUSP282.PROD.OUTLOOK.COM/ Check directly for NULL values instead of calling libbpf_get_error(). Signed-off-by: Tianyi Liu <i.pear@outlook.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Reviewed-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/SY4P282MB1084AD9CD84A920F08DF83E29D549@SY4P282MB1084.AUSP282.PROD.OUTLOOK.COM
Diffstat (limited to 'tools/bpf/bpftool/btf.c')
-rw-r--r--tools/bpf/bpftool/btf.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index 64411fe49a66..68a70ac03c80 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -635,10 +635,9 @@ static int do_dump(int argc, char **argv)
btf = btf__parse_split(*argv, base ?: base_btf);
err = libbpf_get_error(btf);
- if (err) {
- btf = NULL;
+ if (!btf) {
p_err("failed to load BTF from %s: %s",
- *argv, strerror(err));
+ *argv, strerror(errno));
goto done;
}
NEXT_ARG();
@@ -683,8 +682,8 @@ static int do_dump(int argc, char **argv)
btf = btf__load_from_kernel_by_id_split(btf_id, base_btf);
err = libbpf_get_error(btf);
- if (err) {
- p_err("get btf by id (%u): %s", btf_id, strerror(err));
+ if (!btf) {
+ p_err("get btf by id (%u): %s", btf_id, strerror(errno));
goto done;
}
}
@@ -820,7 +819,7 @@ build_btf_type_table(struct hashmap *tab, enum bpf_obj_type type,
u32_as_hash_field(id));
if (err) {
p_err("failed to append entry to hashmap for BTF ID %u, object ID %u: %s",
- btf_id, id, strerror(errno));
+ btf_id, id, strerror(-err));
goto err_free;
}
}