1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) 2 #undef _GNU_SOURCE 3 #include <string.h> 4 #include <stdio.h> 5 #include <errno.h> 6 #include "str_error.h" 7 8 /* make sure libbpf doesn't use kernel-only integer typedefs */ 9 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 10 11 /* 12 * Wrapper to allow for building in non-GNU systems such as Alpine Linux's musl 13 * libc, while checking strerror_r() return to avoid having to check this in 14 * all places calling it. 15 */ 16 char *libbpf_strerror_r(int err, char *dst, int len) 17 { 18 int ret = strerror_r(err < 0 ? -err : err, dst, len); 19 /* on glibc <2.13, ret == -1 and errno is set, if strerror_r() can't 20 * handle the error, on glibc >=2.13 *positive* (errno-like) error 21 * code is returned directly 22 */ 23 if (ret == -1) 24 ret = errno; 25 if (ret) { 26 if (ret == EINVAL) 27 /* strerror_r() doesn't recognize this specific error */ 28 snprintf(dst, len, "unknown error (%d)", err < 0 ? err : -err); 29 else 30 snprintf(dst, len, "ERROR: strerror_r(%d)=%d", err, ret); 31 } 32 return dst; 33 } 34