Etc.uname

static VALUE
etc_uname(VALUE obj)
{
#ifdef _WIN32
    typedef long (WINAPI version_func)(OSVERSIONINFOW *);
    version_func *pRtlGetVersion;
    OSVERSIONINFOW v;
    SYSTEM_INFO s;
    const char *sysname, *mach;
    VALUE result, release, version;
    VALUE vbuf, nodename = Qnil;
    DWORD len = 0;
    WCHAR *buf;

    /* GetVersionEx reports 6.2 unless the manifest declares Windows 8.1 or later */
    pRtlGetVersion = (version_func *)GetProcAddress(GetModuleHandleW(L"ntdll.dll"), "RtlGetVersion");
    v.dwOSVersionInfoSize = sizeof(v);
    if (!pRtlGetVersion || pRtlGetVersion(&v))
        rb_notimplement();

    result = rb_hash_new();
    sysname = "Windows_NT";
    rb_hash_aset(result, SYMBOL_LIT("sysname"), rb_str_new_cstr(sysname));
    release = rb_sprintf("%lu.%lu.%lu", v.dwMajorVersion, v.dwMinorVersion, v.dwBuildNumber);
    rb_hash_aset(result, SYMBOL_LIT("release"), release);
    version = rb_sprintf("%s Version %"PRIsVALUE": %"PRIsVALUE, sysname, release,
                         rb_w32_conv_from_wchar(v.szCSDVersion, rb_utf8_encoding()));
    rb_hash_aset(result, SYMBOL_LIT("version"), version);

#   define GET_COMPUTER_NAME(ptr, plen) GetComputerNameExW(ComputerNameDnsFullyQualified, ptr, plen)
    GET_COMPUTER_NAME(NULL, &len);
    buf = ALLOCV_N(WCHAR, vbuf, len);
    if (GET_COMPUTER_NAME(buf, &len)) {
        nodename = rb_w32_conv_from_wchar(buf, rb_utf8_encoding());
    }
    ALLOCV_END(vbuf);
    if (NIL_P(nodename)) nodename = rb_str_new(0, 0);
    rb_hash_aset(result, SYMBOL_LIT("nodename"), nodename);

# ifndef PROCESSOR_ARCHITECTURE_AMD64
#   define PROCESSOR_ARCHITECTURE_AMD64 9
# endif
# ifndef PROCESSOR_ARCHITECTURE_INTEL
#   define PROCESSOR_ARCHITECTURE_INTEL 0
# endif
# ifndef PROCESSOR_ARCHITECTURE_ARM64
#   define PROCESSOR_ARCHITECTURE_ARM64 12
# endif
    GetSystemInfo(&s);
    switch (s.wProcessorArchitecture) {
      case PROCESSOR_ARCHITECTURE_AMD64:
        mach = "x64";
        break;
      case PROCESSOR_ARCHITECTURE_ARM:
        mach = "ARM";
        break;
      case PROCESSOR_ARCHITECTURE_ARM64:
        mach = "ARM64";
        break;
      case PROCESSOR_ARCHITECTURE_INTEL:
        mach = "x86";
        break;
      default:
        mach = "unknown";
        break;
    }

    rb_hash_aset(result, SYMBOL_LIT("machine"), rb_str_new_cstr(mach));
#else
    struct utsname u;
    int ret;
    VALUE result;

    ret = uname(&u);
    if (ret == -1)
        rb_sys_fail("uname");

    result = rb_hash_new();
    rb_hash_aset(result, SYMBOL_LIT("sysname"), rb_str_new_cstr(u.sysname));
    rb_hash_aset(result, SYMBOL_LIT("nodename"), rb_str_new_cstr(u.nodename));
    rb_hash_aset(result, SYMBOL_LIT("release"), rb_str_new_cstr(u.release));
    rb_hash_aset(result, SYMBOL_LIT("version"), rb_str_new_cstr(u.version));
    rb_hash_aset(result, SYMBOL_LIT("machine"), rb_str_new_cstr(u.machine));
#endif

    return result;
}