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BTF-playground: Handle error and free resources explicitly

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Signed-off-by: Hengqi Chen <chenhengqi@outlook.com>
This commit is contained in:
Hengqi Chen
2022-03-06 21:54:46 +08:00
parent c9398145ac
commit e307581009
1 changed files with 12 additions and 5 deletions
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17
BTF-playground/btf_module_read.c
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@@ -35,9 +35,9 @@ int print_all_levels(enum libbpf_print_level level,
int main(int argc, char **argv)
{
struct btf *vmlinux_btf, *module_btf;
struct btf *vmlinux_btf, *module_btf = NULL;
int opt, longindex = 0;
__s32 type_id;
__s32 type_id;
int err = 0;
/* Parse commands line args */
@@ -46,7 +46,6 @@ int main(int argc, char **argv)
switch (opt) {
case 'd':
libbpf_set_print(print_all_levels);
// verifier_logs = true;
break;
default:
pr_err("Unrecognized option '%s'\n", argv[optind - 1]);
@@ -66,17 +65,25 @@ int main(int argc, char **argv)
module_btf = btf__load_module_btf(module_name, vmlinux_btf);
err = libbpf_get_error(module_btf);
if (err) {
pr_err("ERROR(%d): btf__load_module_btf() module_name:%s\n",
pr_err("ERROR(%d): btf__load_module_btf() module_name: %s\n",
err, module_name);
goto out;
}
type_id = btf__find_by_name(module_btf, symbol_name);
type_id = btf__find_by_name(module_btf, symbol_name);
if (type_id < 0) {
err = type_id;
pr_err("ERROR(%d): btf__find_by_name() symbol_name: %s\n",
err, symbol_name);
goto out;
}
printf("Module:%s Symbol:%s have BTF id:%d\n",
module_name, symbol_name, type_id);
out:
btf__free(module_btf);
btf__free(vmlinux_btf);
if (err)
return EXIT_FAILURE;
return EXIT_SUCCESS;