76 lines · c
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_SOURCE11#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 s6419 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 int ret;43 44 if (!buf || !size)45 return libbpf_err(-EINVAL);46 47 err = err > 0 ? err : -err;48 49 if (err < __LIBBPF_ERRNO__START) {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 ret = snprintf(buf, size, "%s", msg);60 buf[size - 1] = '\0';61 /* The length of the buf and msg is positive.62 * A negative number may be returned only when the63 * size exceeds INT_MAX. Not likely to appear.64 */65 if (ret >= size)66 return libbpf_err(-ERANGE);67 return 0;68 }69 70 ret = snprintf(buf, size, "Unknown libbpf error %d", err);71 buf[size - 1] = '\0';72 if (ret >= size)73 return libbpf_err(-ERANGE);74 return libbpf_err(-ENOENT);75}76