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Linux/tools/lib/bpf/str_error.c

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  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 

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