text: #include "Python.h"
  #include "pycore_fileutils.h"
  #include "osdefs.h"               // SEP
  #include <locale.h>
  
  #ifdef MS_WINDOWS
  #  include <malloc.h>
  #  include <windows.h>
  extern int winerror_to_errno(int);
  #endif
  
  #ifdef HAVE_LANGINFO_H
  #include <langinfo.h>
  #endif
  
  #ifdef HAVE_SYS_IOCTL_H
  #include <sys/ioctl.h>
  #endif
  
  #ifdef HAVE_FCNTL_H
  #include <fcntl.h>
  #endif /* HAVE_FCNTL_H */
  
  #ifdef O_CLOEXEC
  /* Does open() support the O_CLOEXEC flag? Possible values:
  
     -1: unknown
      0: open() ignores O_CLOEXEC flag, ex: Linux kernel older than 2.6.23
      1: open() supports O_CLOEXEC flag, close-on-exec is set
  
     The flag is used by _Py_open(), _Py_open_noraise(), io.FileIO
     and os.open(). */
  int _Py_open_cloexec_works = -1;
  #endif
  
  
  static int
  get_surrogateescape(_Py_error_handler errors, int *surrogateescape)
  {
      switch (errors)
      {
      case _Py_ERROR_STRICT:
          *surrogateescape = 0;
          return 0;
      case _Py_ERROR_SURROGATEESCAPE:
          *surrogateescape = 1;
          return 0;
      default:
          return -1;
      }
  }
  
  
  PyObject *
  _Py_device_encoding(int fd)
  {
  #if defined(MS_WINDOWS)
      UINT cp;
  #endif
      int valid;
      _Py_BEGIN_SUPPRESS_IPH
      valid = isatty(fd);
      _Py_END_SUPPRESS_IPH
      if (!valid)
          Py_RETURN_NONE;
  
  #if defined(MS_WINDOWS)
      if (fd == 0)
          cp = GetConsoleCP();
      else if (fd == 1 || fd == 2)
          cp = GetConsoleOutputCP();
      else
          cp = 0;
      /* GetConsoleCP() and GetConsoleOutputCP() return 0 if the application
         has no console */
      if (cp != 0)
          return PyUnicode_FromFormat("cp%u", (unsigned int)cp);
  #elif defined(CODESET)
      {
          char *codeset = nl_langinfo(CODESET);
          if (codeset != NULL && codeset[0] != 0)
              return PyUnicode_FromString(codeset);
      }
  #endif
      Py_RETURN_NONE;
  }
  
  #if !defined(_Py_FORCE_UTF8_FS_ENCODING) && !defined(MS_WINDOWS)
  
  #define USE_FORCE_ASCII
  
  extern int _Py_normalize_encoding(const char *, char *, size_t);
  
  /* Workaround FreeBSD and OpenIndiana locale encoding issue with the C locale
     and POSIX locale. nl_langinfo(CODESET) announces an alias of the
     ASCII encoding, whereas mbstowcs() and wcstombs() functions use the
     ISO-8859-1 encoding. The problem is that os.fsencode() and os.fsdecode() use
     locale.getpreferredencoding() codec. For example, if command line arguments
     are decoded by mbstowcs() and encoded back by os.fsencode(), we get a
     UnicodeEncodeError instead of retrieving the original byte string.
  
     The workaround is enabled if setlocale(LC_CTYPE, NULL) returns "C",
     nl_langinfo(CODESET) announces "ascii" (or an alias to ASCII), and at least
     one byte in range 0x80-0xff can be decoded from the locale encoding. The
     workaround is also enabled on error, for example if getting the locale
     failed.
  
     On HP-UX with the C locale or the POSIX locale, nl_langinfo(CODESET)
     announces "roman8" but mbstowcs() uses Latin1 in practice. Force also the
     ASCII encoding in this case.
  
     Values of force_ascii:
  
         1: the workaround is used: Py_EncodeLocale() uses
            encode_ascii_surrogateescape() and Py_DecodeLocale() uses
            decode_ascii()
         0: the workaround is not used: Py_EncodeLocale() uses wcstombs() and
            Py_DecodeLocale() uses mbstowcs()
        -1: unknown, need to call check_force_ascii() to get the value
  */
  static int force_ascii = -1;
  
  static int
  check_force_ascii(void)
  {
      char *loc = setlocale(LC_CTYPE, NULL);
      if (loc == NULL) {
          goto error;
      }
      if (strcmp(loc, "C") != 0 && strcmp(loc, "POSIX") != 0) {
          /* the LC_CTYPE locale is different than C and POSIX */
          return 0;
      }
  
  #if defined(HAVE_LANGINFO_H) && defined(CODESET)
      const char *codeset = nl_langinfo(CODESET);
      if (!codeset || codeset[0] == '\0') {
          /* CODESET is not set or empty */
          goto error;
      }
  
      char encoding[20];   /* longest name: "iso_646.irv_1991\0" */
      if (!_Py_normalize_encoding(codeset, encoding, sizeof(encoding))) {
          goto error;
      }
  
  #ifdef __hpux
      if (strcmp(encoding, "roman8") == 0) {
          unsigned char ch;
          wchar_t wch;
          size_t res;
  
          ch = (unsigned char)0xA7;
          res = mbstowcs(&wch, (char*)&ch, 1);
          if (res != (size_t)-1 && wch == L'\xA7') {
              /* On HP-UX withe C locale or the POSIX locale,
                 nl_langinfo(CODESET) announces "roman8", whereas mbstowcs() uses
                 Latin1 encoding in practice. Force ASCII in this case.
  
                 Roman8 decodes 0xA7 to U+00CF. Latin1 decodes 0xA7 to U+00A7. */
              return 1;
          }
      }
  #else
      const char* ascii_aliases[] = {
          "ascii",
          /* Aliases from Lib/encodings/aliases.py */
          "646",
          "ansi_x3.4_1968",
          "ansi_x3.4_1986",
          "ansi_x3_4_1968",
          "cp367",
          "csascii",
          "ibm367",
          "iso646_us",
          "iso_646.irv_1991",
          "iso_ir_6",
          "us",
          "us_ascii",
          NULL
      };
  
      int is_ascii = 0;
      for (const char **alias=ascii_aliases; *alias != NULL; alias++) {
          if (strcmp(encoding, *alias) == 0) {
              is_ascii = 1;
              break;
          }
      }
      if (!is_ascii) {
          /* nl_langinfo(CODESET) is not "ascii" or an alias of ASCII */
          return 0;
      }
  
      for (unsigned int i=0x80; i<=0xff; i++) {
          char ch[1];
          wchar_t wch[1];
          size_t res;
  
          unsigned uch = (unsigned char)i;
          ch[0] = (char)uch;
          res = mbstowcs(wch, ch, 1);
          if (res != (size_t)-1) {
              /* decoding a non-ASCII character from the locale encoding succeed:
                 the locale encoding is not ASCII, force ASCII */
              return 1;
          }
      }
      /* None of the bytes in the range 0x80-0xff can be decoded from the locale
         encoding: the locale encoding is really ASCII */
  #endif   /* !defined(__hpux) */
      return 0;
  #else
      /* nl_langinfo(CODESET) is not available: always force ASCII */
      return 1;
  #endif   /* defined(HAVE_LANGINFO_H) && defined(CODESET) */
  
  error:
      /* if an error occurred, force the ASCII encoding */
      return 1;
  }
  
  
  int
  _Py_GetForceASCII(void)
  {
      if (force_ascii == -1) {
          force_ascii = check_force_ascii();
      }
      return force_ascii;
  }
  
  
  void
  _Py_ResetForceASCII(void)
  {
      force_ascii = -1;
  }
  
  
  static int
  encode_ascii(const wchar_t *text, char **str,
               size_t *error_pos, const char **reason,
               int raw_malloc, _Py_error_handler errors)
  {
      char *result = NULL, *out;
      size_t len, i;
      wchar_t ch;
  
      int surrogateescape;
      if (get_surrogateescape(errors, &surrogateescape) < 0) {
          return -3;
      }
  
      len = wcslen(text);
  
      /* +1 for NULL byte */
      if (raw_malloc) {
          result = PyMem_RawMalloc(len + 1);
      }
      else {
          result = PyMem_Malloc(len + 1);
      }
      if (result == NULL) {
          return -1;
      }
  
      out = result;
      for (i=0; i<len; i++) {
          ch = text[i];
  
          if (ch <= 0x7f) {
              /* ASCII character */
              *out++ = (char)ch;
          }
          else if (surrogateescape && 0xdc80 <= ch && ch <= 0xdcff) {
              /* UTF-8b surrogate */
              *out++ = (char)(ch - 0xdc00);
          }
          else {
              if (raw_malloc) {
                  PyMem_RawFree(result);
              }
              else {
                  PyMem_Free(result);
              }
              if (error_pos != NULL) {
                  *error_pos = i;
              }
              if (reason) {
                  *reason = "encoding error";
              }
              return -2;
          }
      }
      *out = '\0';
      *str = result;
      return 0;
  }
  #else
  int
  _Py_GetForceASCII(void)
  {
      return 0;
  }
  
  void
  _Py_ResetForceASCII(void)
  {
      /* nothing to do */
  }
  #endif   /* !defined(_Py_FORCE_UTF8_FS_ENCODING) && !defined(MS_WINDOWS) */
  
  
  #if !defined(HAVE_MBRTOWC) || defined(USE_FORCE_ASCII)
  static int
  decode_ascii(const char *arg, wchar_t **wstr, size_t *wlen,
               const char **reason, _Py_error_handler errors)
  {
      wchar_t *res;
      unsigned char *in;
      wchar_t *out;
      size_t argsize = strlen(arg) + 1;
  
      int surrogateescape;
      if (get_surrogateescape(errors, &surrogateescape) < 0) {
          return -3;
      }
  
      if (argsize > PY_SSIZE_T_MAX / sizeof(wchar_t)) {
          return -1;
      }
      res = PyMem_RawMalloc(argsize * sizeof(wchar_t));
      if (!res) {
          return -1;
      }
  
      out = res;
      for (in = (unsigned char*)arg; *in; in++) {
          unsigned char ch = *in;
          if (ch < 128) {
              *out++ = ch;
          }
          else {
              if (!surrogateescape) {
                  PyMem_RawFree(res);
                  if (wlen) {
                      *wlen = in - (unsigned char*)arg;
                  }
                  if (reason) {
                      *reason = "decoding error";
                  }
                  return -2;
              }
              *out++ = 0xdc00 + ch;
          }
      }
      *out = 0;
  
      if (wlen != NULL) {
          *wlen = out - res;
      }
      *wstr = res;
      return 0;
  }
  #endif   /* !HAVE_MBRTOWC */
  
  static int
  decode_current_locale(const char* arg, wchar_t **wstr, size_t *wlen,
                        const char **reason, _Py_error_handler errors)
  {
      wchar_t *res;
      size_t argsize;
      size_t count;
  #ifdef HAVE_MBRTOWC
      unsigned char *in;
      wchar_t *out;
      mbstate_t mbs;
  #endif
  
      int surrogateescape;
      if (get_surrogateescape(errors, &surrogateescape) < 0) {
          return -3;
      }
  
  #ifdef HAVE_BROKEN_MBSTOWCS
      /* Some platforms have a broken implementation of
       * mbstowcs which does not count the characters that
       * would result from conversion.  Use an upper bound.
       */
      argsize = strlen(arg);
  #else
      argsize = mbstowcs(NULL, arg, 0);
  #endif
      if (argsize != (size_t)-1) {
          if (argsize > PY_SSIZE_T_MAX / sizeof(wchar_t) - 1) {
              return -1;
          }
          res = (wchar_t *)PyMem_RawMalloc((argsize + 1) * sizeof(wchar_t));
          if (!res) {
              return -1;
          }
  
          count = mbstowcs(res, arg, argsize + 1);
          if (count != (size_t)-1) {
              wchar_t *tmp;
              /* Only use the result if it contains no
                 surrogate characters. */
              for (tmp = res; *tmp != 0 &&
                           !Py_UNICODE_IS_SURROGATE(*tmp); tmp++)
                  ;
              if (*tmp == 0) {
                  if (wlen != NULL) {
                      *wlen = count;
                  }
                  *wstr = res;
                  return 0;
              }
          }
          PyMem_RawFree(res);
      }
  
      /* Conversion failed. Fall back to escaping with surrogateescape. */
  #ifdef HAVE_MBRTOWC
      /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
  
      /* Overallocate; as multi-byte characters are in the argument, the
         actual output could use less memory. */
      argsize = strlen(arg) + 1;
      if (argsize > PY_SSIZE_T_MAX / sizeof(wchar_t)) {
          return -1;
      }
      res = (wchar_t*)PyMem_RawMalloc(argsize * sizeof(wchar_t));
      if (!res) {
          return -1;
      }
  
      in = (unsigned char*)arg;
      out = res;
      memset(&mbs, 0, sizeof mbs);
      while (argsize) {
          size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
          if (converted == 0) {
              /* Reached end of string; null char stored. */
              break;
          }
  
          if (converted == (size_t)-2) {
              /* Incomplete character. This should never happen,
                 since we provide everything that we have -
                 unless there is a bug in the C library, or I
                 misunderstood how mbrtowc works. */
              goto decode_error;
          }
  
          if (converted == (size_t)-1) {
              if (!surrogateescape) {
                  goto decode_error;
              }
  
              /* Conversion error. Escape as UTF-8b, and start over
                 in the initial shift state. */
              *out++ = 0xdc00 + *in++;
              argsize--;
              memset(&mbs, 0, sizeof mbs);
              continue;
          }
  
          if (Py_UNICODE_IS_SURROGATE(*out)) {
              if (!surrogateescape) {
                  goto decode_error;
              }
  
              /* Surrogate character.  Escape the original
                 byte sequence with surrogateescape. */
              argsize -= converted;
              while (converted--) {
                  *out++ = 0xdc00 + *in++;
              }
              continue;
          }
          /* successfully converted some bytes */
          in += converted;
          argsize -= converted;
          out++;
      }
      if (wlen != NULL) {
          *wlen = out - res;
      }
      *wstr = res;
      return 0;
  
  decode_error:
      PyMem_RawFree(res);
      if (wlen) {
          *wlen = in - (unsigned char*)arg;
      }
      if (reason) {
          *reason = "decoding error";
      }
      return -2;
  #else   /* HAVE_MBRTOWC */
      /* Cannot use C locale for escaping; manually escape as if charset
         is ASCII (i.e. escape all bytes > 128. This will still roundtrip
         correctly in the locale's charset, which must be an ASCII superset. */
      return decode_ascii(arg, wstr, wlen, reason, errors);
  #endif   /* HAVE_MBRTOWC */
  }
  
  
  /* Decode a byte string from the locale encoding.
  
     Use the strict error handler if 'surrogateescape' is zero.  Use the
     surrogateescape error handler if 'surrogateescape' is non-zero: undecodable
     bytes are decoded as characters in range U+DC80..U+DCFF. If a byte sequence
     can be decoded as a surrogate character, escape the bytes using the
     surrogateescape error handler instead of decoding them.
  
     On success, return 0 and write the newly allocated wide character string into
     *wstr (use PyMem_RawFree() to free the memory). If wlen is not NULL, write
     the number of wide characters excluding the null character into *wlen.
  
     On memory allocation failure, return -1.
  
     On decoding error, return -2. If wlen is not NULL, write the start of
     invalid byte sequence in the input string into *wlen. If reason is not NULL,
     write the decoding error message into *reason.
  
     Return -3 if the error handler 'errors' is not supported.
  
     Use the Py_EncodeLocaleEx() function to encode the character string back to
     a byte string. */
  int
  _Py_DecodeLocaleEx(const char* arg, wchar_t **wstr, size_t *wlen,
                     const char **reason,
                     int current_locale, _Py_error_handler errors)
  {
      if (current_locale) {
  #ifdef _Py_FORCE_UTF8_LOCALE
          return _Py_DecodeUTF8Ex(arg, strlen(arg), wstr, wlen, reason,
                                  errors);
  #else
          return decode_current_locale(arg, wstr, wlen, reason, errors);
  #endif
      }
  
  #ifdef _Py_FORCE_UTF8_FS_ENCODING
      return _Py_DecodeUTF8Ex(arg, strlen(arg), wstr, wlen, reason,
                              errors);
  #else
      int use_utf8 = (Py_UTF8Mode == 1);
  #ifdef MS_WINDOWS
      use_utf8 |= !Py_LegacyWindowsFSEncodingFlag;
  #endif
      if (use_utf8) {
          return _Py_DecodeUTF8Ex(arg, strlen(arg), wstr, wlen, reason,
                                  errors);
      }
  
  #ifdef USE_FORCE_ASCII
      if (force_ascii == -1) {
          force_ascii = check_force_ascii();
      }
  
      if (force_ascii) {
          /* force ASCII encoding to workaround mbstowcs() issue */
          return decode_ascii(arg, wstr, wlen, reason, errors);
      }
  #endif
  
      return decode_current_locale(arg, wstr, wlen, reason, errors);
  #endif   /* !_Py_FORCE_UTF8_FS_ENCODING */
  }
  
  
  /* Decode a byte string from the locale encoding with the
     surrogateescape error handler: undecodable bytes are decoded as characters
     in range U+DC80..U+DCFF. If a byte sequence can be decoded as a surrogate
     character, escape the bytes using the surrogateescape error handler instead
     of decoding them.
  
     Return a pointer to a newly allocated wide character string, use
     PyMem_RawFree() to free the memory. If size is not NULL, write the number of
     wide characters excluding the null character into *size
  
     Return NULL on decoding error or memory allocation error. If *size* is not
     NULL, *size is set to (size_t)-1 on memory error or set to (size_t)-2 on
     decoding error.
  
     Decoding errors should never happen, unless there is a bug in the C
     library.
  
     Use the Py_EncodeLocale() function to encode the character string back to a
     byte string. */
  wchar_t*
  Py_DecodeLocale(const char* arg, size_t *wlen)
  {
      wchar_t *wstr;
      int res = _Py_DecodeLocaleEx(arg, &wstr, wlen,
                                   NULL, 0,
                                   _Py_ERROR_SURROGATEESCAPE);
      if (res != 0) {
          assert(res != -3);
          if (wlen != NULL) {
              *wlen = (size_t)res;
          }
          return NULL;
      }
      return wstr;
  }
  
  
  static int
  encode_current_locale(const wchar_t *text, char **str,
                        size_t *error_pos, const char **reason,
                        int raw_malloc, _Py_error_handler errors)
  {
      const size_t len = wcslen(text);
      char *result = NULL, *bytes = NULL;
      size_t i, size, converted;
      wchar_t c, buf[2];
  
      int surrogateescape;
      if (get_surrogateescape(errors, &surrogateescape) < 0) {
          return -3;
      }
  
      /* The function works in two steps:
         1. compute the length of the output buffer in bytes (size)
         2. outputs the bytes */
      size = 0;
      buf[1] = 0;
      while (1) {
          for (i=0; i < len; i++) {
              c = text[i];
              if (c >= 0xdc80 && c <= 0xdcff) {
                  if (!surrogateescape) {
                      goto encode_error;
                  }
                  /* UTF-8b surrogate */
                  if (bytes != NULL) {
                      *bytes++ = c - 0xdc00;
                      size--;
                  }
                  else {
                      size++;
                  }
                  continue;
              }
              else {
                  buf[0] = c;
                  if (bytes != NULL) {
                      converted = wcstombs(bytes, buf, size);
                  }
                  else {
                      converted = wcstombs(NULL, buf, 0);
                  }
                  if (converted == (size_t)-1) {
                      goto encode_error;
                  }
                  if (bytes != NULL) {
                      bytes += converted;
                      size -= converted;
                  }
                  else {
                      size += converted;
                  }
              }
          }
          if (result != NULL) {
              *bytes = '\0';
              break;
          }
  
          size += 1; /* nul byte at the end */
          if (raw_malloc) {
              result = PyMem_RawMalloc(size);
          }
          else {
              result = PyMem_Malloc(size);
          }
          if (result == NULL) {
              return -1;
          }
          bytes = result;
      }
      *str = result;
      return 0;
  
  encode_error:
      if (raw_malloc) {
          PyMem_RawFree(result);
      }
      else {
          PyMem_Free(result);
      }
      if (error_pos != NULL) {
          *error_pos = i;
      }
      if (reason) {
          *reason = "encoding error";
      }
      return -2;
  }
  
  
  /* Encode a string to the locale encoding.
  
     Parameters:
  
     * raw_malloc: if non-zero, allocate memory using PyMem_RawMalloc() instead
       of PyMem_Malloc().
     * current_locale: if non-zero, use the current LC_CTYPE, otherwise use
       Python filesystem encoding.
     * errors: error handler like "strict" or "surrogateescape".
  
     Return value:
  
      0: success, *str is set to a newly allocated decoded string.
     -1: memory allocation failure
     -2: encoding error, set *error_pos and *reason (if set).
     -3: the error handler 'errors' is not supported.
   */
  static int
  encode_locale_ex(const wchar_t *text, char **str, size_t *error_pos,
                   const char **reason,
                   int raw_malloc, int current_locale, _Py_error_handler errors)
  {
      if (current_locale) {
  #ifdef _Py_FORCE_UTF8_LOCALE
          return _Py_EncodeUTF8Ex(text, str, error_pos, reason,
                                  raw_malloc, errors);
  #else
          return encode_current_locale(text, str, error_pos, reason,
                                       raw_malloc, errors);
  #endif
      }
  
  #ifdef _Py_FORCE_UTF8_FS_ENCODING
      return _Py_EncodeUTF8Ex(text, str, error_pos, reason,
                              raw_malloc, errors);
  #else
      int use_utf8 = (Py_UTF8Mode == 1);
  #ifdef MS_WINDOWS
      use_utf8 |= !Py_LegacyWindowsFSEncodingFlag;
  #endif
      if (use_utf8) {
          return _Py_EncodeUTF8Ex(text, str, error_pos, reason,
                                  raw_malloc, errors);
      }
  
  #ifdef USE_FORCE_ASCII
      if (force_ascii == -1) {
          force_ascii = check_force_ascii();
      }
  
      if (force_ascii) {
          return encode_ascii(text, str, error_pos, reason,
                              raw_malloc, errors);
      }
  #endif
  
      return encode_current_locale(text, str, error_pos, reason,
                                   raw_malloc, errors);
  #endif   /* _Py_FORCE_UTF8_FS_ENCODING */
  }
  
  static char*
  encode_locale(const wchar_t *text, size_t *error_pos,
                int raw_malloc, int current_locale)
  {
      char *str;
      int res = encode_locale_ex(text, &str, error_pos, NULL,
                                 raw_malloc, current_locale,
                                 _Py_ERROR_SURROGATEESCAPE);
      if (res != -2 && error_pos) {
          *error_pos = (size_t)-1;
      }
      if (res != 0) {
          return NULL;
      }
      return str;
  }
  
  /* Encode a wide character string to the locale encoding with the
     surrogateescape error handler: surrogate characters in the range
     U+DC80..U+DCFF are converted to bytes 0x80..0xFF.
  
     Return a pointer to a newly allocated byte string, use PyMem_Free() to free
     the memory. Return NULL on encoding or memory allocation error.
  
     If error_pos is not NULL, *error_pos is set to (size_t)-1 on success, or set
     to the index of the invalid character on encoding error.
  
     Use the Py_DecodeLocale() function to decode the bytes string back to a wide
     character string. */
  char*
  Py_EncodeLocale(const wchar_t *text, size_t *error_pos)
  {
      return encode_locale(text, error_pos, 0, 0);
  }
  
  
  /* Similar to Py_EncodeLocale(), but result must be freed by PyMem_RawFree()
     instead of PyMem_Free(). */
  char*
  _Py_EncodeLocaleRaw(const wchar_t *text, size_t *error_pos)
  {
      return encode_locale(text, error_pos, 1, 0);
  }
  
  
  int
  _Py_EncodeLocaleEx(const wchar_t *text, char **str,
                     size_t *error_pos, const char **reason,
                     int current_locale, _Py_error_handler errors)
  {
      return encode_locale_ex(text, str, error_pos, reason, 1,
                              current_locale, errors);
  }
  
  
  #ifdef MS_WINDOWS
  static __int64 secs_between_epochs = 11644473600; /* Seconds between 1.1.1601 and 1.1.1970 */
  
  static void
  FILE_TIME_to_time_t_nsec(FILETIME *in_ptr, time_t *time_out, int* nsec_out)
  {
      /* XXX endianness. Shouldn't matter, as all Windows implementations are little-endian */
      /* Cannot simply cast and dereference in_ptr,
         since it might not be aligned properly */
      __int64 in;
      memcpy(&in, in_ptr, sizeof(in));
      *nsec_out = (int)(in % 10000000) * 100; /* FILETIME is in units of 100 nsec. */
      *time_out = Py_SAFE_DOWNCAST((in / 10000000) - secs_between_epochs, __int64, time_t);
  }
  
  void
  _Py_time_t_to_FILE_TIME(time_t time_in, int nsec_in, FILETIME *out_ptr)
  {
      /* XXX endianness */
      __int64 out;
      out = time_in + secs_between_epochs;
      out = out * 10000000 + nsec_in / 100;
      memcpy(out_ptr, &out, sizeof(out));
  }
  
  /* Below, we *know* that ugo+r is 0444 */
  #if _S_IREAD != 0400
  #error Unsupported C library
  #endif
  static int
  attributes_to_mode(DWORD attr)
  {
      int m = 0;
      if (attr & FILE_ATTRIBUTE_DIRECTORY)
          m |= _S_IFDIR | 0111; /* IFEXEC for user,group,other */
      else
          m |= _S_IFREG;
      if (attr & FILE_ATTRIBUTE_READONLY)
          m |= 0444;
      else
          m |= 0666;
      return m;
  }
  
  void
  _Py_attribute_data_to_stat(BY_HANDLE_FILE_INFORMATION *info, ULONG reparse_tag,
                             struct _Py_stat_struct *result)
  {
      memset(result, 0, sizeof(*result));
      result->st_mode = attributes_to_mode(info->dwFileAttributes);
      result->st_size = (((__int64)info->nFileSizeHigh)<<32) + info->nFileSizeLow;
      result->st_dev = info->dwVolumeSerialNumber;
      result->st_rdev = result->st_dev;
      FILE_TIME_to_time_t_nsec(&info->ftCreationTime, &result->st_ctime, &result->st_ctime_nsec);
      FILE_TIME_to_time_t_nsec(&info->ftLastWriteTime, &result->st_mtime, &result->st_mtime_nsec);
      FILE_TIME_to_time_t_nsec(&info->ftLastAccessTime, &result->st_atime, &result->st_atime_nsec);
      result->st_nlink = info->nNumberOfLinks;
      result->st_ino = (((uint64_t)info->nFileIndexHigh) << 32) + info->nFileIndexLow;
      /* bpo-37834: Only actual symlinks set the S_IFLNK flag. But lstat() will
         open other name surrogate reparse points without traversing them. To
         detect/handle these, check st_file_attributes and st_reparse_tag. */
      result->st_reparse_tag = reparse_tag;
      if (info->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT &&
          reparse_tag == IO_REPARSE_TAG_SYMLINK) {
          /* first clear the S_IFMT bits */
          result->st_mode ^= (result->st_mode & S_IFMT);
          /* now set the bits that make this a symlink */
          result->st_mode |= S_IFLNK;
      }
      result->st_file_attributes = info->dwFileAttributes;
  }
  #endif
  
  /* Return information about a file.
  
     On POSIX, use fstat().
  
     On Windows, use GetFileType() and GetFileInformationByHandle() which support
     files larger than 2 GiB.  fstat() may fail with EOVERFLOW on files larger
     than 2 GiB because the file size type is a signed 32-bit integer: see issue
     #23152.
  
     On Windows, set the last Windows error and return nonzero on error. On
     POSIX, set errno and return nonzero on error. Fill status and return 0 on
     success. */
  int
  _Py_fstat_noraise(int fd, struct _Py_stat_struct *status)
  {
  #ifdef MS_WINDOWS
      BY_HANDLE_FILE_INFORMATION info;
      HANDLE h;
      int type;
  
      _Py_BEGIN_SUPPRESS_IPH
      h = (HANDLE)_get_osfhandle(fd);
      _Py_END_SUPPRESS_IPH
  
      if (h == INVALID_HANDLE_VALUE) {
          /* errno is already set by _get_osfhandle, but we also set
             the Win32 error for callers who expect that */
          SetLastError(ERROR_INVALID_HANDLE);
          return -1;
      }
      memset(status, 0, sizeof(*status));
  
      type = GetFileType(h);
      if (type == FILE_TYPE_UNKNOWN) {
          DWORD error = GetLastError();
          if (error != 0) {
              errno = winerror_to_errno(error);
              return -1;
          }
          /* else: valid but unknown file */
      }
  
      if (type != FILE_TYPE_DISK) {
          if (type == FILE_TYPE_CHAR)
              status->st_mode = _S_IFCHR;
          else if (type == FILE_TYPE_PIPE)
              status->st_mode = _S_IFIFO;
          return 0;
      }
  
      if (!GetFileInformationByHandle(h, &info)) {
          /* The Win32 error is already set, but we also set errno for
             callers who expect it */
          errno = winerror_to_errno(GetLastError());
          return -1;
      }
  
      _Py_attribute_data_to_stat(&info, 0, status);
      /* specific to fstat() */
      status->st_ino = (((uint64_t)info.nFileIndexHigh) << 32) + info.nFileIndexLow;
      return 0;
  #else
      return fstat(fd, status);
  #endif
  }
  
  /* Return information about a file.
  
     On POSIX, use fstat().
  
     On Windows, use GetFileType() and GetFileInformationByHandle() which support
     files larger than 2 GiB.  fstat() may fail with EOVERFLOW on files larger
     than 2 GiB because the file size type is a signed 32-bit integer: see issue
     #23152.
  
     Raise an exception and return -1 on error. On Windows, set the last Windows
     error on error. On POSIX, set errno on error. Fill status and return 0 on
     success.
  
     Release the GIL to call GetFileType() and GetFileInformationByHandle(), or
     to call fstat(). The caller must hold the GIL. */
  int
  _Py_fstat(int fd, struct _Py_stat_struct *status)
  {
      int res;
  
      assert(PyGILState_Check());
  
      Py_BEGIN_ALLOW_THREADS
      res = _Py_fstat_noraise(fd, status);
      Py_END_ALLOW_THREADS
  
      if (res != 0) {
  #ifdef MS_WINDOWS
          PyErr_SetFromWindowsErr(0);
  #else
          PyErr_SetFromErrno(PyExc_OSError);
  #endif
          return -1;
      }
      return 0;
  }
  
  /* Call _wstat() on Windows, or encode the path to the filesystem encoding and
     call stat() otherwise. Only fill st_mode attribute on Windows.
  
     Return 0 on success, -1 on _wstat() / stat() error, -2 if an exception was
     raised. */
  
  int
  _Py_stat(PyObject *path, struct stat *statbuf)
  {
  #ifdef MS_WINDOWS
      int err;
      struct _stat wstatbuf;
  
  #if USE_UNICODE_WCHAR_CACHE
      const wchar_t *wpath = _PyUnicode_AsUnicode(path);
  #else /* USE_UNICODE_WCHAR_CACHE */
      wchar_t *wpath = PyUnicode_AsWideCharString(path, NULL);
  #endif /* USE_UNICODE_WCHAR_CACHE */
      if (wpath == NULL)
          return -2;
  
      err = _wstat(wpath, &wstatbuf);
      if (!err)
          statbuf->st_mode = wstatbuf.st_mode;
  #if !USE_UNICODE_WCHAR_CACHE
      PyMem_Free(wpath);
  #endif /* USE_UNICODE_WCHAR_CACHE */
      return err;
  #else
      int ret;
      PyObject *bytes;
      char *cpath;
  
      bytes = PyUnicode_EncodeFSDefault(path);
      if (bytes == NULL)
          return -2;
  
      /* check for embedded null bytes */
      if (PyBytes_AsStringAndSize(bytes, &cpath, NULL) == -1) {
          Py_DECREF(bytes);
          return -2;
      }
  
      ret = stat(cpath, statbuf);
      Py_DECREF(bytes);
      return ret;
  #endif
  }
  
  
  /* This function MUST be kept async-signal-safe on POSIX when raise=0. */
  static int
  get_inheritable(int fd, int raise)
  {
  #ifdef MS_WINDOWS
      HANDLE handle;
      DWORD flags;
  
      _Py_BEGIN_SUPPRESS_IPH
      handle = (HANDLE)_get_osfhandle(fd);
      _Py_END_SUPPRESS_IPH
      if (handle == INVALID_HANDLE_VALUE) {
          if (raise)
              PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
      if (!GetHandleInformation(handle, &flags)) {
          if (raise)
              PyErr_SetFromWindowsErr(0);
          return -1;
      }
  
      return (flags & HANDLE_FLAG_INHERIT);
  #else
      int flags;
  
      flags = fcntl(fd, F_GETFD, 0);
      if (flags == -1) {
          if (raise)
              PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
      return !(flags & FD_CLOEXEC);
  #endif
  }
  
  /* Get the inheritable flag of the specified file descriptor.
     Return 1 if the file descriptor can be inherited, 0 if it cannot,
     raise an exception and return -1 on error. */
  int
  _Py_get_inheritable(int fd)
  {
      return get_inheritable(fd, 1);
  }
  
  
  /* This function MUST be kept async-signal-safe on POSIX when raise=0. */
  static int
  set_inheritable(int fd, int inheritable, int raise, int *atomic_flag_works)
  {
  #ifdef MS_WINDOWS
      HANDLE handle;
      DWORD flags;
  #else
  #if defined(HAVE_SYS_IOCTL_H) && defined(FIOCLEX) && defined(FIONCLEX)
      static int ioctl_works = -1;
      int request;
      int err;
  #endif
      int flags, new_flags;
      int res;
  #endif
  
      /* atomic_flag_works can only be used to make the file descriptor
         non-inheritable */
      assert(!(atomic_flag_works != NULL && inheritable));
  
      if (atomic_flag_works != NULL && !inheritable) {
          if (*atomic_flag_works == -1) {
              int isInheritable = get_inheritable(fd, raise);
              if (isInheritable == -1)
                  return -1;
              *atomic_flag_works = !isInheritable;
          }
  
          if (*atomic_flag_works)
              return 0;
      }
  
  #ifdef MS_WINDOWS
      _Py_BEGIN_SUPPRESS_IPH
      handle = (HANDLE)_get_osfhandle(fd);
      _Py_END_SUPPRESS_IPH
      if (handle == INVALID_HANDLE_VALUE) {
          if (raise)
              PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
      if (inheritable)
          flags = HANDLE_FLAG_INHERIT;
      else
          flags = 0;
  
      /* This check can be removed once support for Windows 7 ends. */
  #define CONSOLE_PSEUDOHANDLE(handle) (((ULONG_PTR)(handle) & 0x3) == 0x3 && \
          GetFileType(handle) == FILE_TYPE_CHAR)
  
      if (!CONSOLE_PSEUDOHANDLE(handle) &&
          !SetHandleInformation(handle, HANDLE_FLAG_INHERIT, flags)) {
          if (raise)
              PyErr_SetFromWindowsErr(0);
          return -1;
      }
  #undef CONSOLE_PSEUDOHANDLE
      return 0;
  
  #else
  
  #if defined(HAVE_SYS_IOCTL_H) && defined(FIOCLEX) && defined(FIONCLEX)
      if (ioctl_works != 0 && raise != 0) {
          /* fast-path: ioctl() only requires one syscall */
          /* caveat: raise=0 is an indicator that we must be async-signal-safe
           * thus avoid using ioctl() so we skip the fast-path. */
          if (inheritable)
              request = FIONCLEX;
          else
              request = FIOCLEX;
          err = ioctl(fd, request, NULL);
          if (!err) {
              ioctl_works = 1;
              return 0;
          }
  
          if (errno != ENOTTY && errno != EACCES) {
              if (raise)
                  PyErr_SetFromErrno(PyExc_OSError);
              return -1;
          }
          else {
              /* Issue #22258: Here, ENOTTY means "Inappropriate ioctl for
                 device". The ioctl is declared but not supported by the kernel.
                 Remember that ioctl() doesn't work. It is the case on
                 Illumos-based OS for example.
  
                 Issue #27057: When SELinux policy disallows ioctl it will fail
                 with EACCES. While FIOCLEX is safe operation it may be
                 unavailable because ioctl was denied altogether.
                 This can be the case on Android. */
              ioctl_works = 0;
          }
          /* fallback to fcntl() if ioctl() does not work */
      }
  #endif
  
      /* slow-path: fcntl() requires two syscalls */
      flags = fcntl(fd, F_GETFD);
      if (flags < 0) {
          if (raise)
              PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
      if (inheritable) {
          new_flags = flags & ~FD_CLOEXEC;
      }
      else {
          new_flags = flags | FD_CLOEXEC;
      }
  
      if (new_flags == flags) {
          /* FD_CLOEXEC flag already set/cleared: nothing to do */
          return 0;
      }
  
      res = fcntl(fd, F_SETFD, new_flags);
      if (res < 0) {
          if (raise)
              PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
      return 0;
  #endif
  }
  
  /* Make the file descriptor non-inheritable.
     Return 0 on success, set errno and return -1 on error. */
  static int
  make_non_inheritable(int fd)
  {
      return set_inheritable(fd, 0, 0, NULL);
  }
  
  /* Set the inheritable flag of the specified file descriptor.
     On success: return 0, on error: raise an exception and return -1.
  
     If atomic_flag_works is not NULL:
  
      * if *atomic_flag_works==-1, check if the inheritable is set on the file
        descriptor: if yes, set *atomic_flag_works to 1, otherwise set to 0 and
        set the inheritable flag
      * if *atomic_flag_works==1: do nothing
      * if *atomic_flag_works==0: set inheritable flag to False
  
     Set atomic_flag_works to NULL if no atomic flag was used to create the
     file descriptor.
  
     atomic_flag_works can only be used to make a file descriptor
     non-inheritable: atomic_flag_works must be NULL if inheritable=1. */
  int
  _Py_set_inheritable(int fd, int inheritable, int *atomic_flag_works)
  {
      return set_inheritable(fd, inheritable, 1, atomic_flag_works);
  }
  
  /* Same as _Py_set_inheritable() but on error, set errno and
     don't raise an exception.
     This function is async-signal-safe. */
  int
  _Py_set_inheritable_async_safe(int fd, int inheritable, int *atomic_flag_works)
  {
      return set_inheritable(fd, inheritable, 0, atomic_flag_works);
  }
  
  static int
  _Py_open_impl(const char *pathname, int flags, int gil_held)
  {
      int fd;
      int async_err = 0;
  #ifndef MS_WINDOWS
      int *atomic_flag_works;
  #endif
  
  #ifdef MS_WINDOWS
      flags |= O_NOINHERIT;
  #elif defined(O_CLOEXEC)
      atomic_flag_works = &_Py_open_cloexec_works;
      flags |= O_CLOEXEC;
  #else
      atomic_flag_works = NULL;
  #endif
  
      if (gil_held) {
          PyObject *pathname_obj = PyUnicode_DecodeFSDefault(pathname);
          if (pathname_obj == NULL) {
              return -1;
          }
          if (PySys_Audit("open", "OOi", pathname_obj, Py_None, flags) < 0) {
              Py_DECREF(pathname_obj);
              return -1;
          }
  
          do {
              Py_BEGIN_ALLOW_THREADS
              fd = open(pathname, flags);
              Py_END_ALLOW_THREADS
          } while (fd < 0
                   && errno == EINTR && !(async_err = PyErr_CheckSignals()));
          if (async_err) {
              Py_DECREF(pathname_obj);
              return -1;
          }
          if (fd < 0) {
              PyErr_SetFromErrnoWithFilenameObjects(PyExc_OSError, pathname_obj, NULL);
              Py_DECREF(pathname_obj);
              return -1;
          }
          Py_DECREF(pathname_obj);
      }
      else {
          fd = open(pathname, flags);
          if (fd < 0)
              return -1;
      }
  
  #ifndef MS_WINDOWS
      if (set_inheritable(fd, 0, gil_held, atomic_flag_works) < 0) {
          close(fd);
          return -1;
      }
  #endif
  
      return fd;
  }
  
  /* Open a file with the specified flags (wrapper to open() function).
     Return a file descriptor on success. Raise an exception and return -1 on
     error.
  
     The file descriptor is created non-inheritable.
  
     When interrupted by a signal (open() fails with EINTR), retry the syscall,
     except if the Python signal handler raises an exception.
  
     Release the GIL to call open(). The caller must hold the GIL. */
  int
  _Py_open(const char *pathname, int flags)
  {
      /* _Py_open() must be called with the GIL held. */
      assert(PyGILState_Check());
      return _Py_open_impl(pathname, flags, 1);
  }
  
  /* Open a file with the specified flags (wrapper to open() function).
     Return a file descriptor on success. Set errno and return -1 on error.
  
     The file descriptor is created non-inheritable.
  
     If interrupted by a signal, fail with EINTR. */
  int
  _Py_open_noraise(const char *pathname, int flags)
  {
      return _Py_open_impl(pathname, flags, 0);
  }
  
  /* Open a file. Use _wfopen() on Windows, encode the path to the locale
     encoding and use fopen() otherwise.
  
     The file descriptor is created non-inheritable.
  
     If interrupted by a signal, fail with EINTR. */
  FILE *
  _Py_wfopen(const wchar_t *path, const wchar_t *mode)
  {
      FILE *f;
      if (PySys_Audit("open", "uui", path, mode, 0) < 0) {
          return NULL;
      }
  #ifndef MS_WINDOWS
      char *cpath;
      char cmode[10];
      size_t r;
      r = wcstombs(cmode, mode, 10);
      if (r == (size_t)-1 || r >= 10) {
          errno = EINVAL;
          return NULL;
      }
      cpath = _Py_EncodeLocaleRaw(path, NULL);
      if (cpath == NULL) {
          return NULL;
      }
      f = fopen(cpath, cmode);
      PyMem_RawFree(cpath);
  #else
      f = _wfopen(path, mode);
  #endif
      if (f == NULL)
          return NULL;
      if (make_non_inheritable(fileno(f)) < 0) {
          fclose(f);
          return NULL;
      }
      return f;
  }
  
  /* Wrapper to fopen().
  
     The file descriptor is created non-inheritable.
  
     If interrupted by a signal, fail with EINTR. */
  FILE*
  _Py_fopen(const char *pathname, const char *mode)
  {
      PyObject *pathname_obj = PyUnicode_DecodeFSDefault(pathname);
      if (pathname_obj == NULL) {
          return NULL;
      }
      if (PySys_Audit("open", "Osi", pathname_obj, mode, 0) < 0) {
          Py_DECREF(pathname_obj);
          return NULL;
      }
      Py_DECREF(pathname_obj);
  
      FILE *f = fopen(pathname, mode);
      if (f == NULL)
          return NULL;
      if (make_non_inheritable(fileno(f)) < 0) {
          fclose(f);
          return NULL;
      }
      return f;
  }
  
  /* Open a file. Call _wfopen() on Windows, or encode the path to the filesystem
     encoding and call fopen() otherwise.
  
     Return the new file object on success. Raise an exception and return NULL
     on error.
  
     The file descriptor is created non-inheritable.
  
     When interrupted by a signal (open() fails with EINTR), retry the syscall,
     except if the Python signal handler raises an exception.
  
     Release the GIL to call _wfopen() or fopen(). The caller must hold
     the GIL. */
  FILE*
  _Py_fopen_obj(PyObject *path, const char *mode)
  {
      FILE *f;
      int async_err = 0;
  #ifdef MS_WINDOWS
      wchar_t wmode[10];
      int usize;
  
      assert(PyGILState_Check());
  
      if (PySys_Audit("open", "Osi", path, mode, 0) < 0) {
          return NULL;
      }
      if (!PyUnicode_Check(path)) {
          PyErr_Format(PyExc_TypeError,
                       "str file path expected under Windows, got %R",
                       Py_TYPE(path));
          return NULL;
      }
  #if USE_UNICODE_WCHAR_CACHE
      const wchar_t *wpath = _PyUnicode_AsUnicode(path);
  #else /* USE_UNICODE_WCHAR_CACHE */
      wchar_t *wpath = PyUnicode_AsWideCharString(path, NULL);
  #endif /* USE_UNICODE_WCHAR_CACHE */
      if (wpath == NULL)
          return NULL;
  
      usize = MultiByteToWideChar(CP_ACP, 0, mode, -1,
                                  wmode, Py_ARRAY_LENGTH(wmode));
      if (usize == 0) {
          PyErr_SetFromWindowsErr(0);
  #if !USE_UNICODE_WCHAR_CACHE
          PyMem_Free(wpath);
  #endif /* USE_UNICODE_WCHAR_CACHE */
          return NULL;
      }
  
      do {
          Py_BEGIN_ALLOW_THREADS
          f = _wfopen(wpath, wmode);
          Py_END_ALLOW_THREADS
      } while (f == NULL
               && errno == EINTR && !(async_err = PyErr_CheckSignals()));
  #if !USE_UNICODE_WCHAR_CACHE
      PyMem_Free(wpath);
  #endif /* USE_UNICODE_WCHAR_CACHE */
  #else
      PyObject *bytes;
      const char *path_bytes;
  
      assert(PyGILState_Check());
  
      if (!PyUnicode_FSConverter(path, &bytes))
          return NULL;
      path_bytes = PyBytes_AS_STRING(bytes);
  
      if (PySys_Audit("open", "Osi", path, mode, 0) < 0) {
          Py_DECREF(bytes);
          return NULL;
      }
  
      do {
          Py_BEGIN_ALLOW_THREADS
          f = fopen(path_bytes, mode);
          Py_END_ALLOW_THREADS
      } while (f == NULL
               && errno == EINTR && !(async_err = PyErr_CheckSignals()));
  
      Py_DECREF(bytes);
  #endif
      if (async_err)
          return NULL;
  
      if (f == NULL) {
          PyErr_SetFromErrnoWithFilenameObject(PyExc_OSError, path);
          return NULL;
      }
  
      if (set_inheritable(fileno(f), 0, 1, NULL) < 0) {
          fclose(f);
          return NULL;
      }
      return f;
  }
  
  /* Read count bytes from fd into buf.
  
     On success, return the number of read bytes, it can be lower than count.
     If the current file offset is at or past the end of file, no bytes are read,
     and read() returns zero.
  
     On error, raise an exception, set errno and return -1.
  
     When interrupted by a signal (read() fails with EINTR), retry the syscall.
     If the Python signal handler raises an exception, the function returns -1
     (the syscall is not retried).
  
     Release the GIL to call read(). The caller must hold the GIL. */
  Py_ssize_t
  _Py_read(int fd, void *buf, size_t count)
  {
      Py_ssize_t n;
      int err;
      int async_err = 0;
  
      assert(PyGILState_Check());
  
      /* _Py_read() must not be called with an exception set, otherwise the
       * caller may think that read() was interrupted by a signal and the signal
       * handler raised an exception. */
      assert(!PyErr_Occurred());
  
      if (count > _PY_READ_MAX) {
          count = _PY_READ_MAX;
      }
  
      _Py_BEGIN_SUPPRESS_IPH
      do {
          Py_BEGIN_ALLOW_THREADS
          errno = 0;
  #ifdef MS_WINDOWS
          n = read(fd, buf, (int)count);
  #else
          n = read(fd, buf, count);
  #endif
          /* save/restore errno because PyErr_CheckSignals()
           * and PyErr_SetFromErrno() can modify it */
          err = errno;
          Py_END_ALLOW_THREADS
      } while (n < 0 && err == EINTR &&
              !(async_err = PyErr_CheckSignals()));
      _Py_END_SUPPRESS_IPH
  
      if (async_err) {
          /* read() was interrupted by a signal (failed with EINTR)
           * and the Python signal handler raised an exception */
          errno = err;
          assert(errno == EINTR && PyErr_Occurred());
          return -1;
      }
      if (n < 0) {
          PyErr_SetFromErrno(PyExc_OSError);
          errno = err;
          return -1;
      }
  
      return n;
  }
  
  static Py_ssize_t
  _Py_write_impl(int fd, const void *buf, size_t count, int gil_held)
  {
      Py_ssize_t n;
      int err;
      int async_err = 0;
  
      _Py_BEGIN_SUPPRESS_IPH
  #ifdef MS_WINDOWS
      if (count > 32767 && isatty(fd)) {
          /* Issue #11395: the Windows console returns an error (12: not
             enough space error) on writing into stdout if stdout mode is
             binary and the length is greater than 66,000 bytes (or less,
             depending on heap usage). */
          count = 32767;
      }
  #endif
      if (count > _PY_WRITE_MAX) {
          count = _PY_WRITE_MAX;
      }
  
      if (gil_held) {
          do {
              Py_BEGIN_ALLOW_THREADS
              errno = 0;
  #ifdef MS_WINDOWS
              n = write(fd, buf, (int)count);
  #else
              n = write(fd, buf, count);
  #endif
              /* save/restore errno because PyErr_CheckSignals()
               * and PyErr_SetFromErrno() can modify it */
              err = errno;
              Py_END_ALLOW_THREADS
          } while (n < 0 && err == EINTR &&
                  !(async_err = PyErr_CheckSignals()));
      }
      else {
          do {
              errno = 0;
  #ifdef MS_WINDOWS
              n = write(fd, buf, (int)count);
  #else
              n = write(fd, buf, count);
  #endif
              err = errno;
          } while (n < 0 && err == EINTR);
      }
      _Py_END_SUPPRESS_IPH
  
      if (async_err) {
          /* write() was interrupted by a signal (failed with EINTR)
             and the Python signal handler raised an exception (if gil_held is
             nonzero). */
          errno = err;
          assert(errno == EINTR && (!gil_held || PyErr_Occurred()));
          return -1;
      }
      if (n < 0) {
          if (gil_held)
              PyErr_SetFromErrno(PyExc_OSError);
          errno = err;
          return -1;
      }
  
      return n;
  }
  
  /* Write count bytes of buf into fd.
  
     On success, return the number of written bytes, it can be lower than count
     including 0. On error, raise an exception, set errno and return -1.
  
     When interrupted by a signal (write() fails with EINTR), retry the syscall.
     If the Python signal handler raises an exception, the function returns -1
     (the syscall is not retried).
  
     Release the GIL to call write(). The caller must hold the GIL. */
  Py_ssize_t
  _Py_write(int fd, const void *buf, size_t count)
  {
      assert(PyGILState_Check());
  
      /* _Py_write() must not be called with an exception set, otherwise the
       * caller may think that write() was interrupted by a signal and the signal
       * handler raised an exception. */
      assert(!PyErr_Occurred());
  
      return _Py_write_impl(fd, buf, count, 1);
  }
  
  /* Write count bytes of buf into fd.
   *
   * On success, return the number of written bytes, it can be lower than count
   * including 0. On error, set errno and return -1.
   *
   * When interrupted by a signal (write() fails with EINTR), retry the syscall
   * without calling the Python signal handler. */
  Py_ssize_t
  _Py_write_noraise(int fd, const void *buf, size_t count)
  {
      return _Py_write_impl(fd, buf, count, 0);
  }
  
  #ifdef HAVE_READLINK
  
  /* Read value of symbolic link. Encode the path to the locale encoding, decode
     the result from the locale encoding.
  
     Return -1 on encoding error, on readlink() error, if the internal buffer is
     too short, on decoding error, or if 'buf' is too short. */
  int
  _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t buflen)
  {
      char *cpath;
      char cbuf[MAXPATHLEN];
      size_t cbuf_len = Py_ARRAY_LENGTH(cbuf);
      wchar_t *wbuf;
      Py_ssize_t res;
      size_t r1;
  
      cpath = _Py_EncodeLocaleRaw(path, NULL);
      if (cpath == NULL) {
          errno = EINVAL;
          return -1;
      }
      res = readlink(cpath, cbuf, cbuf_len);
      PyMem_RawFree(cpath);
      if (res == -1) {
          return -1;
      }
      if ((size_t)res == cbuf_len) {
          errno = EINVAL;
          return -1;
      }
      cbuf[res] = '\0'; /* buf will be null terminated */
      wbuf = Py_DecodeLocale(cbuf, &r1);
      if (wbuf == NULL) {
          errno = EINVAL;
          return -1;
      }
      /* wbuf must have space to store the trailing NUL character */
      if (buflen <= r1) {
          PyMem_RawFree(wbuf);
          errno = EINVAL;
          return -1;
      }
      wcsncpy(buf, wbuf, buflen);
      PyMem_RawFree(wbuf);
      return (int)r1;
  }
  #endif
  
  #ifdef HAVE_REALPATH
  
  /* Return the canonicalized absolute pathname. Encode path to the locale
     encoding, decode the result from the locale encoding.
  
     Return NULL on encoding error, realpath() error, decoding error
     or if 'resolved_path' is too short. */
  wchar_t*
  _Py_wrealpath(const wchar_t *path,
                wchar_t *resolved_path, size_t resolved_path_len)
  {
      char *cpath;
      char cresolved_path[MAXPATHLEN];
      wchar_t *wresolved_path;
      char *res;
      size_t r;
      cpath = _Py_EncodeLocaleRaw(path, NULL);
      if (cpath == NULL) {
          errno = EINVAL;
          return NULL;
      }
      res = realpath(cpath, cresolved_path);
      PyMem_RawFree(cpath);
      if (res == NULL)
          return NULL;
  
      wresolved_path = Py_DecodeLocale(cresolved_path, &r);
      if (wresolved_path == NULL) {
          errno = EINVAL;
          return NULL;
      }
      /* wresolved_path must have space to store the trailing NUL character */
      if (resolved_path_len <= r) {
          PyMem_RawFree(wresolved_path);
          errno = EINVAL;
          return NULL;
      }
      wcsncpy(resolved_path, wresolved_path, resolved_path_len);
      PyMem_RawFree(wresolved_path);
      return resolved_path;
  }
  #endif
  
  
  #ifndef MS_WINDOWS
  int
  _Py_isabs(const wchar_t *path)
  {
      return (path[0] == SEP);
  }
  #endif
  
  
  /* Get an absolute path.
     On error (ex: fail to get the current directory), return -1.
     On memory allocation failure, set *abspath_p to NULL and return 0.
     On success, return a newly allocated to *abspath_p to and return 0.
     The string must be freed by PyMem_RawFree(). */
  int
  _Py_abspath(const wchar_t *path, wchar_t **abspath_p)
  {
  #ifdef MS_WINDOWS
      wchar_t woutbuf[MAX_PATH], *woutbufp = woutbuf;
      DWORD result;
  
      result = GetFullPathNameW(path,
                                Py_ARRAY_LENGTH(woutbuf), woutbuf,
                                NULL);
      if (!result) {
          return -1;
      }
  
      if (result > Py_ARRAY_LENGTH(woutbuf)) {
          if ((size_t)result <= (size_t)PY_SSIZE_T_MAX / sizeof(wchar_t)) {
              woutbufp = PyMem_RawMalloc((size_t)result * sizeof(wchar_t));
          }
          else {
              woutbufp = NULL;
          }
          if (!woutbufp) {
              *abspath_p = NULL;
              return 0;
          }
  
          result = GetFullPathNameW(path, result, woutbufp, NULL);
          if (!result) {
              PyMem_RawFree(woutbufp);
              return -1;
          }
      }
  
      if (woutbufp != woutbuf) {
          *abspath_p = woutbufp;
          return 0;
      }
  
      *abspath_p = _PyMem_RawWcsdup(woutbufp);
      return 0;
  #else
      if (_Py_isabs(path)) {
          *abspath_p = _PyMem_RawWcsdup(path);
          return 0;
      }
  
      wchar_t cwd[MAXPATHLEN + 1];
      cwd[Py_ARRAY_LENGTH(cwd) - 1] = 0;
      if (!_Py_wgetcwd(cwd, Py_ARRAY_LENGTH(cwd) - 1)) {
          /* unable to get the current directory */
          return -1;
      }
  
      size_t cwd_len = wcslen(cwd);
      size_t path_len = wcslen(path);
      size_t len = cwd_len + 1 + path_len + 1;
      if (len <= (size_t)PY_SSIZE_T_MAX / sizeof(wchar_t)) {
          *abspath_p = PyMem_RawMalloc(len * sizeof(wchar_t));
      }
      else {
          *abspath_p = NULL;
      }
      if (*abspath_p == NULL) {
          return 0;
      }
  
      wchar_t *abspath = *abspath_p;
      memcpy(abspath, cwd, cwd_len * sizeof(wchar_t));
      abspath += cwd_len;
  
      *abspath = (wchar_t)SEP;
      abspath++;
  
      memcpy(abspath, path, path_len * sizeof(wchar_t));
      abspath += path_len;
  
      *abspath = 0;
      return 0;
  #endif
  }
  
  
  /* Get the current directory. buflen is the buffer size in wide characters
     including the null character. Decode the path from the locale encoding.
  
     Return NULL on getcwd() error, on decoding error, or if 'buf' is
     too short. */
  wchar_t*
  _Py_wgetcwd(wchar_t *buf, size_t buflen)
  {
  #ifdef MS_WINDOWS
      int ibuflen = (int)Py_MIN(buflen, INT_MAX);
      return _wgetcwd(buf, ibuflen);
  #else
      char fname[MAXPATHLEN];
      wchar_t *wname;
      size_t len;
  
      if (getcwd(fname, Py_ARRAY_LENGTH(fname)) == NULL)
          return NULL;
      wname = Py_DecodeLocale(fname, &len);
      if (wname == NULL)
          return NULL;
      /* wname must have space to store the trailing NUL character */
      if (buflen <= len) {
          PyMem_RawFree(wname);
          return NULL;
      }
      wcsncpy(buf, wname, buflen);
      PyMem_RawFree(wname);
      return buf;
  #endif
  }
  
  /* Duplicate a file descriptor. The new file descriptor is created as
     non-inheritable. Return a new file descriptor on success, raise an OSError
     exception and return -1 on error.
  
     The GIL is released to call dup(). The caller must hold the GIL. */
  int
  _Py_dup(int fd)
  {
  #ifdef MS_WINDOWS
      HANDLE handle;
  #endif
  
      assert(PyGILState_Check());
  
  #ifdef MS_WINDOWS
      _Py_BEGIN_SUPPRESS_IPH
      handle = (HANDLE)_get_osfhandle(fd);
      _Py_END_SUPPRESS_IPH
      if (handle == INVALID_HANDLE_VALUE) {
          PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
      Py_BEGIN_ALLOW_THREADS
      _Py_BEGIN_SUPPRESS_IPH
      fd = dup(fd);
      _Py_END_SUPPRESS_IPH
      Py_END_ALLOW_THREADS
      if (fd < 0) {
          PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
      if (_Py_set_inheritable(fd, 0, NULL) < 0) {
          _Py_BEGIN_SUPPRESS_IPH
          close(fd);
          _Py_END_SUPPRESS_IPH
          return -1;
      }
  #elif defined(HAVE_FCNTL_H) && defined(F_DUPFD_CLOEXEC)
      Py_BEGIN_ALLOW_THREADS
      _Py_BEGIN_SUPPRESS_IPH
      fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
      _Py_END_SUPPRESS_IPH
      Py_END_ALLOW_THREADS
      if (fd < 0) {
          PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
  #else
      Py_BEGIN_ALLOW_THREADS
      _Py_BEGIN_SUPPRESS_IPH
      fd = dup(fd);
      _Py_END_SUPPRESS_IPH
      Py_END_ALLOW_THREADS
      if (fd < 0) {
          PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
      if (_Py_set_inheritable(fd, 0, NULL) < 0) {
          _Py_BEGIN_SUPPRESS_IPH
          close(fd);
          _Py_END_SUPPRESS_IPH
          return -1;
      }
  #endif
      return fd;
  }
  
  #ifndef MS_WINDOWS
  /* Get the blocking mode of the file descriptor.
     Return 0 if the O_NONBLOCK flag is set, 1 if the flag is cleared,
     raise an exception and return -1 on error. */
  int
  _Py_get_blocking(int fd)
  {
      int flags;
      _Py_BEGIN_SUPPRESS_IPH
      flags = fcntl(fd, F_GETFL, 0);
      _Py_END_SUPPRESS_IPH
      if (flags < 0) {
          PyErr_SetFromErrno(PyExc_OSError);
          return -1;
      }
  
      return !(flags & O_NONBLOCK);
  }
  
  /* Set the blocking mode of the specified file descriptor.
  
     Set the O_NONBLOCK flag if blocking is False, clear the O_NONBLOCK flag
     otherwise.
  
     Return 0 on success, raise an exception and return -1 on error. */
  int
  _Py_set_blocking(int fd, int blocking)
  {
  #if defined(HAVE_SYS_IOCTL_H) && defined(FIONBIO)
      int arg = !blocking;
      if (ioctl(fd, FIONBIO, &arg) < 0)
          goto error;
  #else
      int flags, res;
  
      _Py_BEGIN_SUPPRESS_IPH
      flags = fcntl(fd, F_GETFL, 0);
      if (flags >= 0) {
          if (blocking)
              flags = flags & (~O_NONBLOCK);
          else
              flags = flags | O_NONBLOCK;
  
          res = fcntl(fd, F_SETFL, flags);
      } else {
          res = -1;
      }
      _Py_END_SUPPRESS_IPH
  
      if (res < 0)
          goto error;
  #endif
      return 0;
  
  error:
      PyErr_SetFromErrno(PyExc_OSError);
      return -1;
  }
  #endif
  
  
  int
  _Py_GetLocaleconvNumeric(struct lconv *lc,
                           PyObject **decimal_point, PyObject **thousands_sep)
  {
      assert(decimal_point != NULL);
      assert(thousands_sep != NULL);
  
      int change_locale = 0;
      if ((strlen(lc->decimal_point) > 1 || ((unsigned char)lc->decimal_point[0]) > 127)) {
          change_locale = 1;
      }
      if ((strlen(lc->thousands_sep) > 1 || ((unsigned char)lc->thousands_sep[0]) > 127)) {
          change_locale = 1;
      }
  
      /* Keep a copy of the LC_CTYPE locale */
      char *oldloc = NULL, *loc = NULL;
      if (change_locale) {
          oldloc = setlocale(LC_CTYPE, NULL);
          if (!oldloc) {
              PyErr_SetString(PyExc_RuntimeWarning,
                              "failed to get LC_CTYPE locale");
              return -1;
          }
  
          oldloc = _PyMem_Strdup(oldloc);
          if (!oldloc) {
              PyErr_NoMemory();
              return -1;
          }
  
          loc = setlocale(LC_NUMERIC, NULL);
          if (loc != NULL && strcmp(loc, oldloc) == 0) {
              loc = NULL;
          }
  
          if (loc != NULL) {
              /* Only set the locale temporarily the LC_CTYPE locale
                 if LC_NUMERIC locale is different than LC_CTYPE locale and
                 decimal_point and/or thousands_sep are non-ASCII or longer than
                 1 byte */
              setlocale(LC_CTYPE, loc);
          }
      }
  
      int res = -1;
  
      *decimal_point = PyUnicode_DecodeLocale(lc->decimal_point, NULL);
      if (*decimal_point == NULL) {
          goto done;
      }
  
      *thousands_sep = PyUnicode_DecodeLocale(lc->thousands_sep, NULL);
      if (*thousands_sep == NULL) {
          goto done;
      }
  
      res = 0;
  
  done:
      if (loc != NULL) {
          setlocale(LC_CTYPE, oldloc);
      }
      PyMem_Free(oldloc);
      return res;
  }
  
  /* Our selection logic for which function to use is as follows:
   * 1. If close_range(2) is available, always prefer that; it's better for
   *    contiguous ranges like this than fdwalk(3) which entails iterating over
   *    the entire fd space and simply doing nothing for those outside the range.
   * 2. If closefrom(2) is available, we'll attempt to use that next if we're
   *    closing up to sysconf(_SC_OPEN_MAX).
   * 2a. Fallback to fdwalk(3) if we're not closing up to sysconf(_SC_OPEN_MAX),
   *    as that will be more performant if the range happens to have any chunk of
   *    non-opened fd in the middle.
   * 2b. If fdwalk(3) isn't available, just do a plain close(2) loop.
   */
  #ifdef __FreeBSD__
  #  define USE_CLOSEFROM
  #endif /* __FreeBSD__ */
  
  #ifdef HAVE_FDWALK
  #  define USE_FDWALK
  #endif /* HAVE_FDWALK */
  
  #ifdef USE_FDWALK
  static int
  _fdwalk_close_func(void *lohi, int fd)
  {
      int lo = ((int *)lohi)[0];
      int hi = ((int *)lohi)[1];
  
      if (fd >= hi) {
          return 1;
      }
      else if (fd >= lo) {
          /* Ignore errors */
          (void)close(fd);
      }
      return 0;
  }
  #endif /* USE_FDWALK */
  
  /* Closes all file descriptors in [first, last], ignoring errors. */
  void
  _Py_closerange(int first, int last)
  {
      first = Py_MAX(first, 0);
      _Py_BEGIN_SUPPRESS_IPH
  #ifdef HAVE_CLOSE_RANGE
      if (close_range(first, last, 0) == 0 || errno != ENOSYS) {
          /* Any errors encountered while closing file descriptors are ignored;
           * ENOSYS means no kernel support, though,
           * so we'll fallback to the other methods. */
      }
      else
  #endif /* HAVE_CLOSE_RANGE */
  #ifdef USE_CLOSEFROM
      if (last >= sysconf(_SC_OPEN_MAX)) {
          /* Any errors encountered while closing file descriptors are ignored */
          closefrom(first);
      }
      else
  #endif /* USE_CLOSEFROM */
  #ifdef USE_FDWALK
      {
          int lohi[2];
          lohi[0] = first;
          lohi[1] = last + 1;
          fdwalk(_fdwalk_close_func, lohi);
      }
  #else
      {
          for (int i = first; i <= last; i++) {
              /* Ignore errors */
              (void)close(i);
          }
      }
  #endif /* USE_FDWALK */
      _Py_END_SUPPRESS_IPH
  }
  