// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) /* * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org> * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com> * Copyright (C) 2015 Huawei Inc. * Copyright (C) 2017 Nicira, Inc. */ #undef _GNU_SOURCE #include <stdio.h> #include <string.h> #include "libbpf.h" #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START) #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c) #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START) static const char *libbpf_strerror_table[NR_ERRNO] = { [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch", [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", [ERRCODE_OFFSET(RELOC)] = "Relocation failed", [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type", [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message", [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence", [ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing", }; int libbpf_strerror(int err, char *buf, size_t size) { if (!buf || !size) return -1; err = err > 0 ? err : -err; if (err < __LIBBPF_ERRNO__START) { int ret; ret = strerror_r(err, buf, size); buf[size - 1] = '\0'; return ret; } if (err < __LIBBPF_ERRNO__END) { const char *msg; msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; snprintf(buf, size, "%s", msg); buf[size - 1] = '\0'; return 0; } snprintf(buf, size, "Unknown libbpf error %d", err); buf[size - 1] = '\0'; return -1; }