libgo/runtime/go-strerror.c

   1 /* go-strerror.c -- wrapper around XSI-compliant strerror_r.
   2
   3    Copyright 2022 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 /* There are two version of strerror_r on GNU/Linux: a GNU-specific
   8    and an XSI-compliant version.  The former version is only available
   9    on glibc.  Since glibc 2.13, the XSI-compliant version is also
  10    provided by glibc if _GNU_SOURCE is not defined.  Since the
  11    entirety of gofrontend is compiled with _GNU_SOURCE, this file
  12    exists to selectively undefine it and provides an alias to the
  13    XSI-compliant version of strerror_r(3).  */
  14
  15 #if defined(__linux__) || defined(__gnu_hurd__)
  16
  17 /* Force selection of XSI-compliant strerror_r by glibc.  */
  18 #undef XOPEN_SOURCE
  19 #define XOPEN_SOURCE 600
  20 #undef _POSIX_C_SOURCE
  21 #define _POSIX_C_SOURCE 200112L
  22 #undef _GNU_SOURCE
  23
  24 #endif /* defined(__linux__) || defined(__gnu_hurd__) */
  25
  26 #include <string.h>
  27
  28 #ifndef HAVE_STRERROR_R
  29 // Provided by go-nosys.c if not provided by libc itself.
  30 extern int strerror_r (int, char *, size_t);
  31 #endif
  32
  33 int
  34 go_strerror (int errnum, char *buf, size_t buflen)
  35 {
  36   return strerror_r (errnum, buf, buflen);
  37 }