mirror of
https://github.com/xdp-project/bpf-examples.git
synced 2024-05-06 15:54:53 +00:00
91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <bpf/libbpf.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <bpf/btf.h> /* Notice libbpf BTF include */
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#include <linux/err.h>
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static const char *module_name = "tun";
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static const char *symbol_name = "tun_struct";
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static const struct option long_options[] = {
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{ "debug", no_argument, NULL, 'd' },
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{ 0, 0, NULL, 0 }
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};
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int print_all_levels(enum libbpf_print_level level,
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const char *format, va_list args)
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{
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return vfprintf(stderr, format, args);
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}
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#define pr_err(fmt, ...) \
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fprintf(stderr, "%s:%d - " fmt, __FILE__, __LINE__, ##__VA_ARGS__)
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int main(int argc, char **argv)
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{
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struct btf *vmlinux_btf, *module_btf = NULL;
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int opt, longindex = 0;
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__s32 type_id;
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int err = 0;
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/* Parse commands line args */
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while ((opt = getopt_long(argc, argv, "d",
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long_options, &longindex)) != -1) {
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switch (opt) {
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case 'd':
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libbpf_set_print(print_all_levels);
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break;
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default:
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pr_err("Unrecognized option '%s'\n", argv[optind - 1]);
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return EXIT_FAILURE;
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}
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}
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argc -= optind;
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argv += optind;
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vmlinux_btf = btf__load_vmlinux_btf();
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err = libbpf_get_error(vmlinux_btf);
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if (err) {
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pr_err("ERROR(%d): btf__load_vmlinux_btf()\n", err);
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goto out;
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}
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module_btf = btf__load_module_btf(module_name, vmlinux_btf);
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err = libbpf_get_error(module_btf);
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if (err) {
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pr_err("ERROR(%d): btf__load_module_btf() module_name: %s\n",
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err, module_name);
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goto out;
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}
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type_id = btf__find_by_name(module_btf, symbol_name);
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if (type_id < 0) {
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err = type_id;
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pr_err("ERROR(%d): btf__find_by_name() symbol_name: %s\n",
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err, symbol_name);
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goto out;
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}
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printf("Module:%s Symbol:%s have BTF id:%d\n",
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module_name, symbol_name, type_id);
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out:
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btf__free(module_btf);
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btf__free(vmlinux_btf);
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if (err)
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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