cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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libbpf_errno.c (2042B)


      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#include "libbpf_internal.h"
     16
     17/* make sure libbpf doesn't use kernel-only integer typedefs */
     18#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
     19
     20#define ERRNO_OFFSET(e)		((e) - __LIBBPF_ERRNO__START)
     21#define ERRCODE_OFFSET(c)	ERRNO_OFFSET(LIBBPF_ERRNO__##c)
     22#define NR_ERRNO	(__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
     23
     24static const char *libbpf_strerror_table[NR_ERRNO] = {
     25	[ERRCODE_OFFSET(LIBELF)]	= "Something wrong in libelf",
     26	[ERRCODE_OFFSET(FORMAT)]	= "BPF object format invalid",
     27	[ERRCODE_OFFSET(KVERSION)]	= "'version' section incorrect or lost",
     28	[ERRCODE_OFFSET(ENDIAN)]	= "Endian mismatch",
     29	[ERRCODE_OFFSET(INTERNAL)]	= "Internal error in libbpf",
     30	[ERRCODE_OFFSET(RELOC)]		= "Relocation failed",
     31	[ERRCODE_OFFSET(VERIFY)]	= "Kernel verifier blocks program loading",
     32	[ERRCODE_OFFSET(PROG2BIG)]	= "Program too big",
     33	[ERRCODE_OFFSET(KVER)]		= "Incorrect kernel version",
     34	[ERRCODE_OFFSET(PROGTYPE)]	= "Kernel doesn't support this program type",
     35	[ERRCODE_OFFSET(WRNGPID)]	= "Wrong pid in netlink message",
     36	[ERRCODE_OFFSET(INVSEQ)]	= "Invalid netlink sequence",
     37	[ERRCODE_OFFSET(NLPARSE)]	= "Incorrect netlink message parsing",
     38};
     39
     40int libbpf_strerror(int err, char *buf, size_t size)
     41{
     42	if (!buf || !size)
     43		return libbpf_err(-EINVAL);
     44
     45	err = err > 0 ? err : -err;
     46
     47	if (err < __LIBBPF_ERRNO__START) {
     48		int ret;
     49
     50		ret = strerror_r(err, buf, size);
     51		buf[size - 1] = '\0';
     52		return libbpf_err_errno(ret);
     53	}
     54
     55	if (err < __LIBBPF_ERRNO__END) {
     56		const char *msg;
     57
     58		msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
     59		snprintf(buf, size, "%s", msg);
     60		buf[size - 1] = '\0';
     61		return 0;
     62	}
     63
     64	snprintf(buf, size, "Unknown libbpf error %d", err);
     65	buf[size - 1] = '\0';
     66	return libbpf_err(-ENOENT);
     67}