mingw-w64-crt/misc/_get_errno.c

/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the mingw-w64 runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
#include <errno.h>

errno_t __cdecl _get_errno (int *_Value)
{
  if(!_Value)
  {
    errno = EINVAL;
    return EINVAL;
  }

  *_Value = errno;
  return 0;
}