1*4882a593Smuzhiyun // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun /*
4*4882a593Smuzhiyun * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
5*4882a593Smuzhiyun * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
6*4882a593Smuzhiyun * Copyright (C) 2015 Huawei Inc.
7*4882a593Smuzhiyun * Copyright (C) 2017 Nicira, Inc.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #undef _GNU_SOURCE
11*4882a593Smuzhiyun #include <stdio.h>
12*4882a593Smuzhiyun #include <string.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "libbpf.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /* make sure libbpf doesn't use kernel-only integer typedefs */
17*4882a593Smuzhiyun #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
20*4882a593Smuzhiyun #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
21*4882a593Smuzhiyun #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static const char *libbpf_strerror_table[NR_ERRNO] = {
24*4882a593Smuzhiyun [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
25*4882a593Smuzhiyun [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
26*4882a593Smuzhiyun [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
27*4882a593Smuzhiyun [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch",
28*4882a593Smuzhiyun [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
29*4882a593Smuzhiyun [ERRCODE_OFFSET(RELOC)] = "Relocation failed",
30*4882a593Smuzhiyun [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
31*4882a593Smuzhiyun [ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
32*4882a593Smuzhiyun [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
33*4882a593Smuzhiyun [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type",
34*4882a593Smuzhiyun [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message",
35*4882a593Smuzhiyun [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence",
36*4882a593Smuzhiyun [ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing",
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
libbpf_strerror(int err,char * buf,size_t size)39*4882a593Smuzhiyun int libbpf_strerror(int err, char *buf, size_t size)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun if (!buf || !size)
42*4882a593Smuzhiyun return -1;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun err = err > 0 ? err : -err;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun if (err < __LIBBPF_ERRNO__START) {
47*4882a593Smuzhiyun int ret;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun ret = strerror_r(err, buf, size);
50*4882a593Smuzhiyun buf[size - 1] = '\0';
51*4882a593Smuzhiyun return ret;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun if (err < __LIBBPF_ERRNO__END) {
55*4882a593Smuzhiyun const char *msg;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
58*4882a593Smuzhiyun snprintf(buf, size, "%s", msg);
59*4882a593Smuzhiyun buf[size - 1] = '\0';
60*4882a593Smuzhiyun return 0;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun snprintf(buf, size, "Unknown libbpf error %d", err);
64*4882a593Smuzhiyun buf[size - 1] = '\0';
65*4882a593Smuzhiyun return -1;
66*4882a593Smuzhiyun }
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