Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2
3/*
4 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
5 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
6 * Copyright (C) 2015 Huawei Inc.
7 * Copyright (C) 2017 Nicira, Inc.
8 */
9
10#undef _GNU_SOURCE
11#include <stdio.h>
12#include <string.h>
13
14#include "libbpf.h"
15
16#define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
17#define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
18#define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
19
20static const char *libbpf_strerror_table[NR_ERRNO] = {
21 [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
22 [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
23 [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
24 [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch",
25 [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
26 [ERRCODE_OFFSET(RELOC)] = "Relocation failed",
27 [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
28 [ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
29 [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
30 [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type",
31 [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message",
32 [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence",
33 [ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing",
34};
35
36int libbpf_strerror(int err, char *buf, size_t size)
37{
38 if (!buf || !size)
39 return -1;
40
41 err = err > 0 ? err : -err;
42
43 if (err < __LIBBPF_ERRNO__START) {
44 int ret;
45
46 ret = strerror_r(err, buf, size);
47 buf[size - 1] = '\0';
48 return ret;
49 }
50
51 if (err < __LIBBPF_ERRNO__END) {
52 const char *msg;
53
54 msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
55 snprintf(buf, size, "%s", msg);
56 buf[size - 1] = '\0';
57 return 0;
58 }
59
60 snprintf(buf, size, "Unknown libbpf error %d", err);
61 buf[size - 1] = '\0';
62 return -1;
63}