| #include "Python.h" |
| #include "osdefs.h" |
| #include <locale.h> |
| |
| #ifdef MS_WINDOWS |
| # include <windows.h> |
| #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 __APPLE__ |
| extern wchar_t* _Py_DecodeUTF8_surrogateescape(const char *s, Py_ssize_t size); |
| #endif |
| |
| #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(), io.FileIO and os.open() */ |
| int _Py_open_cloexec_works = -1; |
| #endif |
| |
| PyObject * |
| _Py_device_encoding(int fd) |
| { |
| #if defined(MS_WINDOWS) |
| UINT cp; |
| #endif |
| if (!_PyVerify_fd(fd) || !isatty(fd)) { |
| 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(__APPLE__) && !defined(MS_WINDOWS) |
| extern int _Py_normalize_encoding(const char *, char *, size_t); |
| |
| /* Workaround FreeBSD and OpenIndiana locale encoding issue with the C locale. |
| On these operating systems, 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. |
| |
| Values of force_ascii: |
| |
| 1: the workaround is used: _Py_wchar2char() uses |
| encode_ascii_surrogateescape() and _Py_char2wchar() uses |
| decode_ascii_surrogateescape() |
| 0: the workaround is not used: _Py_wchar2char() uses wcstombs() and |
| _Py_char2wchar() 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; |
| #if defined(HAVE_LANGINFO_H) && defined(CODESET) |
| char *codeset, **alias; |
| char encoding[100]; |
| int is_ascii; |
| unsigned int i; |
| char* ascii_aliases[] = { |
| "ascii", |
| "646", |
| "ansi-x3.4-1968", |
| "ansi-x3-4-1968", |
| "ansi-x3.4-1986", |
| "cp367", |
| "csascii", |
| "ibm367", |
| "iso646-us", |
| "iso-646.irv-1991", |
| "iso-ir-6", |
| "us", |
| "us-ascii", |
| NULL |
| }; |
| #endif |
| |
| loc = setlocale(LC_CTYPE, NULL); |
| if (loc == NULL) |
| goto error; |
| if (strcmp(loc, "C") != 0) { |
| /* the LC_CTYPE locale is different than C */ |
| return 0; |
| } |
| |
| #if defined(HAVE_LANGINFO_H) && defined(CODESET) |
| codeset = nl_langinfo(CODESET); |
| if (!codeset || codeset[0] == '\0') { |
| /* CODESET is not set or empty */ |
| goto error; |
| } |
| if (!_Py_normalize_encoding(codeset, encoding, sizeof(encoding))) |
| goto error; |
| |
| is_ascii = 0; |
| for (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 (i=0x80; i<0xff; i++) { |
| unsigned char ch; |
| wchar_t wch; |
| size_t res; |
| |
| ch = (unsigned char)i; |
| res = mbstowcs(&wch, (char*)&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 */ |
| return 0; |
| #else |
| /* nl_langinfo(CODESET) is not available: always force ASCII */ |
| return 1; |
| #endif |
| |
| error: |
| /* if an error occured, force the ASCII encoding */ |
| return 1; |
| } |
| |
| static char* |
| encode_ascii_surrogateescape(const wchar_t *text, size_t *error_pos) |
| { |
| char *result = NULL, *out; |
| size_t len, i; |
| wchar_t ch; |
| |
| if (error_pos != NULL) |
| *error_pos = (size_t)-1; |
| |
| len = wcslen(text); |
| |
| result = PyMem_Malloc(len + 1); /* +1 for NUL byte */ |
| if (result == NULL) |
| return NULL; |
| |
| out = result; |
| for (i=0; i<len; i++) { |
| ch = text[i]; |
| |
| if (ch <= 0x7f) { |
| /* ASCII character */ |
| *out++ = (char)ch; |
| } |
| else if (0xdc80 <= ch && ch <= 0xdcff) { |
| /* UTF-8b surrogate */ |
| *out++ = (char)(ch - 0xdc00); |
| } |
| else { |
| if (error_pos != NULL) |
| *error_pos = i; |
| PyMem_Free(result); |
| return NULL; |
| } |
| } |
| *out = '\0'; |
| return result; |
| } |
| #endif /* !defined(__APPLE__) && !defined(MS_WINDOWS) */ |
| |
| #if !defined(__APPLE__) && (!defined(MS_WINDOWS) || !defined(HAVE_MBRTOWC)) |
| static wchar_t* |
| decode_ascii_surrogateescape(const char *arg, size_t *size) |
| { |
| wchar_t *res; |
| unsigned char *in; |
| wchar_t *out; |
| size_t argsize = strlen(arg) + 1; |
| |
| if (argsize > PY_SSIZE_T_MAX/sizeof(wchar_t)) |
| return NULL; |
| res = PyMem_RawMalloc(argsize*sizeof(wchar_t)); |
| if (!res) |
| return NULL; |
| |
| in = (unsigned char*)arg; |
| out = res; |
| while(*in) |
| if(*in < 128) |
| *out++ = *in++; |
| else |
| *out++ = 0xdc00 + *in++; |
| *out = 0; |
| if (size != NULL) |
| *size = out - res; |
| return res; |
| } |
| #endif |
| |
| |
| /* 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. |
| |
| Use _Py_wchar2char() to encode the character string back to a byte string. |
| |
| Return a pointer to a newly allocated wide character string (use |
| PyMem_RawFree() to free the memory) and write the number of written wide |
| characters excluding the null character into *size if size is not NULL, or |
| NULL on error (decoding or memory allocation error). If size is not NULL, |
| *size is set to (size_t)-1 on memory error and (size_t)-2 on decoding |
| error. |
| |
| Conversion errors should never happen, unless there is a bug in the C |
| library. */ |
| wchar_t* |
| _Py_char2wchar(const char* arg, size_t *size) |
| { |
| #ifdef __APPLE__ |
| wchar_t *wstr; |
| wstr = _Py_DecodeUTF8_surrogateescape(arg, strlen(arg)); |
| if (size != NULL) { |
| if (wstr != NULL) |
| *size = wcslen(wstr); |
| else |
| *size = (size_t)-1; |
| } |
| return wstr; |
| #else |
| wchar_t *res; |
| size_t argsize; |
| size_t count; |
| #ifdef HAVE_MBRTOWC |
| unsigned char *in; |
| wchar_t *out; |
| mbstate_t mbs; |
| #endif |
| |
| #ifndef MS_WINDOWS |
| if (force_ascii == -1) |
| force_ascii = check_force_ascii(); |
| |
| if (force_ascii) { |
| /* force ASCII encoding to workaround mbstowcs() issue */ |
| res = decode_ascii_surrogateescape(arg, size); |
| if (res == NULL) |
| goto oom; |
| return res; |
| } |
| #endif |
| |
| #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) |
| goto oom; |
| argsize += 1; |
| if (argsize > PY_SSIZE_T_MAX/sizeof(wchar_t)) |
| goto oom; |
| res = (wchar_t *)PyMem_RawMalloc(argsize*sizeof(wchar_t)); |
| if (!res) |
| goto oom; |
| count = mbstowcs(res, arg, argsize); |
| 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 (size != NULL) |
| *size = count; |
| return res; |
| } |
| } |
| 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)) |
| goto oom; |
| res = (wchar_t*)PyMem_RawMalloc(argsize*sizeof(wchar_t)); |
| if (!res) |
| goto oom; |
| 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. */ |
| PyMem_RawFree(res); |
| if (size != NULL) |
| *size = (size_t)-2; |
| return NULL; |
| } |
| if (converted == (size_t)-1) { |
| /* 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)) { |
| /* 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 (size != NULL) |
| *size = out - res; |
| #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. */ |
| res = decode_ascii_surrogateescape(arg, size); |
| if (res == NULL) |
| goto oom; |
| #endif /* HAVE_MBRTOWC */ |
| return res; |
| oom: |
| if (size != NULL) |
| *size = (size_t)-1; |
| return NULL; |
| #endif /* __APPLE__ */ |
| } |
| |
| /* Encode a (wide) character string to the locale encoding with the |
| surrogateescape error handler (characters in range U+DC80..U+DCFF are |
| converted to bytes 0x80..0xFF). |
| |
| This function is the reverse of _Py_char2wchar(). |
| |
| Return a pointer to a newly allocated byte string (use PyMem_Free() to free |
| the memory), or NULL on encoding or memory allocation error. |
| |
| If error_pos is not NULL: *error_pos is the index of the invalid character |
| on encoding error, or (size_t)-1 otherwise. */ |
| char* |
| _Py_wchar2char(const wchar_t *text, size_t *error_pos) |
| { |
| #ifdef __APPLE__ |
| Py_ssize_t len; |
| PyObject *unicode, *bytes = NULL; |
| char *cpath; |
| |
| unicode = PyUnicode_FromWideChar(text, wcslen(text)); |
| if (unicode == NULL) |
| return NULL; |
| |
| bytes = _PyUnicode_AsUTF8String(unicode, "surrogateescape"); |
| Py_DECREF(unicode); |
| if (bytes == NULL) { |
| PyErr_Clear(); |
| if (error_pos != NULL) |
| *error_pos = (size_t)-1; |
| return NULL; |
| } |
| |
| len = PyBytes_GET_SIZE(bytes); |
| cpath = PyMem_Malloc(len+1); |
| if (cpath == NULL) { |
| PyErr_Clear(); |
| Py_DECREF(bytes); |
| if (error_pos != NULL) |
| *error_pos = (size_t)-1; |
| return NULL; |
| } |
| memcpy(cpath, PyBytes_AsString(bytes), len + 1); |
| Py_DECREF(bytes); |
| return cpath; |
| #else /* __APPLE__ */ |
| const size_t len = wcslen(text); |
| char *result = NULL, *bytes = NULL; |
| size_t i, size, converted; |
| wchar_t c, buf[2]; |
| |
| #ifndef MS_WINDOWS |
| if (force_ascii == -1) |
| force_ascii = check_force_ascii(); |
| |
| if (force_ascii) |
| return encode_ascii_surrogateescape(text, error_pos); |
| #endif |
| |
| /* 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) { |
| /* 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) { |
| if (result != NULL) |
| PyMem_Free(result); |
| if (error_pos != NULL) |
| *error_pos = i; |
| return NULL; |
| } |
| if (bytes != NULL) { |
| bytes += converted; |
| size -= converted; |
| } |
| else |
| size += converted; |
| } |
| } |
| if (result != NULL) { |
| *bytes = '\0'; |
| break; |
| } |
| |
| size += 1; /* nul byte at the end */ |
| result = PyMem_Malloc(size); |
| if (result == NULL) { |
| if (error_pos != NULL) |
| *error_pos = (size_t)-1; |
| return NULL; |
| } |
| bytes = result; |
| } |
| return result; |
| #endif /* __APPLE__ */ |
| } |
| |
| /* In principle, this should use HAVE__WSTAT, and _wstat |
| should be detected by autoconf. However, no current |
| POSIX system provides that function, so testing for |
| it is pointless. |
| Not sure whether the MS_WINDOWS guards are necessary: |
| perhaps for cygwin/mingw builds? |
| */ |
| #if defined(HAVE_STAT) && !defined(MS_WINDOWS) |
| |
| /* Get file status. Encode the path to the locale encoding. */ |
| |
| int |
| _Py_wstat(const wchar_t* path, struct stat *buf) |
| { |
| int err; |
| char *fname; |
| fname = _Py_wchar2char(path, NULL); |
| if (fname == NULL) { |
| errno = EINVAL; |
| return -1; |
| } |
| err = stat(fname, buf); |
| PyMem_Free(fname); |
| return err; |
| } |
| #endif |
| |
| #ifdef HAVE_STAT |
| |
| /* 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; |
| wchar_t *wpath; |
| |
| wpath = PyUnicode_AsUnicode(path); |
| if (wpath == NULL) |
| return -2; |
| err = _wstat(wpath, &wstatbuf); |
| if (!err) |
| statbuf->st_mode = wstatbuf.st_mode; |
| return err; |
| #else |
| int ret; |
| PyObject *bytes = PyUnicode_EncodeFSDefault(path); |
| if (bytes == NULL) |
| return -2; |
| ret = stat(PyBytes_AS_STRING(bytes), statbuf); |
| Py_DECREF(bytes); |
| return ret; |
| #endif |
| } |
| |
| #endif |
| |
| static int |
| get_inheritable(int fd, int raise) |
| { |
| #ifdef MS_WINDOWS |
| HANDLE handle; |
| DWORD flags; |
| |
| if (!_PyVerify_fd(fd)) { |
| if (raise) |
| PyErr_SetFromErrno(PyExc_OSError); |
| return -1; |
| } |
| |
| handle = (HANDLE)_get_osfhandle(fd); |
| if (handle == INVALID_HANDLE_VALUE) { |
| if (raise) |
| PyErr_SetFromWindowsErr(0); |
| 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); |
| } |
| |
| 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; |
| 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 inheritable = get_inheritable(fd, raise); |
| if (inheritable == -1) |
| return -1; |
| *atomic_flag_works = !inheritable; |
| } |
| |
| if (*atomic_flag_works) |
| return 0; |
| } |
| |
| #ifdef MS_WINDOWS |
| if (!_PyVerify_fd(fd)) { |
| if (raise) |
| PyErr_SetFromErrno(PyExc_OSError); |
| return -1; |
| } |
| |
| handle = (HANDLE)_get_osfhandle(fd); |
| if (handle == INVALID_HANDLE_VALUE) { |
| if (raise) |
| PyErr_SetFromWindowsErr(0); |
| return -1; |
| } |
| |
| if (inheritable) |
| flags = HANDLE_FLAG_INHERIT; |
| else |
| flags = 0; |
| if (!SetHandleInformation(handle, HANDLE_FLAG_INHERIT, flags)) { |
| if (raise) |
| PyErr_SetFromWindowsErr(0); |
| return -1; |
| } |
| return 0; |
| |
| #else |
| |
| #if defined(HAVE_SYS_IOCTL_H) && defined(FIOCLEX) && defined(FIONCLEX) |
| if (ioctl_works != 0) { |
| /* fast-path: ioctl() only requires one syscall */ |
| if (inheritable) |
| request = FIONCLEX; |
| else |
| request = FIOCLEX; |
| err = ioctl(fd, request, NULL); |
| if (!err) { |
| ioctl_works = 1; |
| return 0; |
| } |
| |
| if (errno != ENOTTY) { |
| 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. */ |
| 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) |
| flags &= ~FD_CLOEXEC; |
| else |
| flags |= FD_CLOEXEC; |
| res = fcntl(fd, F_SETFD, 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 if raise is nonzero |
| 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); |
| } |
| |
| /* Open a file with the specified flags (wrapper to open() function). |
| The file descriptor is created non-inheritable. */ |
| int |
| _Py_open(const char *pathname, int flags) |
| { |
| int fd; |
| #ifdef MS_WINDOWS |
| fd = open(pathname, flags | O_NOINHERIT); |
| if (fd < 0) |
| return fd; |
| #else |
| |
| int *atomic_flag_works; |
| #ifdef O_CLOEXEC |
| atomic_flag_works = &_Py_open_cloexec_works; |
| flags |= O_CLOEXEC; |
| #else |
| atomic_flag_works = NULL; |
| #endif |
| fd = open(pathname, flags); |
| if (fd < 0) |
| return fd; |
| |
| if (set_inheritable(fd, 0, 0, atomic_flag_works) < 0) { |
| close(fd); |
| return -1; |
| } |
| #endif /* !MS_WINDOWS */ |
| return fd; |
| } |
| |
| /* 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. */ |
| FILE * |
| _Py_wfopen(const wchar_t *path, const wchar_t *mode) |
| { |
| FILE *f; |
| #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_wchar2char(path, NULL); |
| if (cpath == NULL) |
| return NULL; |
| f = fopen(cpath, cmode); |
| PyMem_Free(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. */ |
| FILE* |
| _Py_fopen(const char *pathname, const char *mode) |
| { |
| 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. The file descriptor is created |
| non-inheritable. |
| |
| Return the new file object on success, or NULL if the file cannot be open or |
| (if PyErr_Occurred()) on unicode error. */ |
| FILE* |
| _Py_fopen_obj(PyObject *path, const char *mode) |
| { |
| FILE *f; |
| #ifdef MS_WINDOWS |
| wchar_t *wpath; |
| wchar_t wmode[10]; |
| int usize; |
| |
| if (!PyUnicode_Check(path)) { |
| PyErr_Format(PyExc_TypeError, |
| "str file path expected under Windows, got %R", |
| Py_TYPE(path)); |
| return NULL; |
| } |
| wpath = PyUnicode_AsUnicode(path); |
| if (wpath == NULL) |
| return NULL; |
| |
| usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode)); |
| if (usize == 0) |
| return NULL; |
| |
| f = _wfopen(wpath, wmode); |
| #else |
| PyObject *bytes; |
| if (!PyUnicode_FSConverter(path, &bytes)) |
| return NULL; |
| f = fopen(PyBytes_AS_STRING(bytes), mode); |
| Py_DECREF(bytes); |
| #endif |
| if (f == NULL) |
| return NULL; |
| if (make_non_inheritable(fileno(f)) < 0) { |
| fclose(f); |
| return NULL; |
| } |
| return f; |
| } |
| |
| #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 error. */ |
| |
| int |
| _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz) |
| { |
| char *cpath; |
| char cbuf[MAXPATHLEN]; |
| wchar_t *wbuf; |
| int res; |
| size_t r1; |
| |
| cpath = _Py_wchar2char(path, NULL); |
| if (cpath == NULL) { |
| errno = EINVAL; |
| return -1; |
| } |
| res = (int)readlink(cpath, cbuf, Py_ARRAY_LENGTH(cbuf)); |
| PyMem_Free(cpath); |
| if (res == -1) |
| return -1; |
| if (res == Py_ARRAY_LENGTH(cbuf)) { |
| errno = EINVAL; |
| return -1; |
| } |
| cbuf[res] = '\0'; /* buf will be null terminated */ |
| wbuf = _Py_char2wchar(cbuf, &r1); |
| if (wbuf == NULL) { |
| errno = EINVAL; |
| return -1; |
| } |
| if (bufsiz <= r1) { |
| PyMem_RawFree(wbuf); |
| errno = EINVAL; |
| return -1; |
| } |
| wcsncpy(buf, wbuf, bufsiz); |
| 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 error. */ |
| |
| wchar_t* |
| _Py_wrealpath(const wchar_t *path, |
| wchar_t *resolved_path, size_t resolved_path_size) |
| { |
| char *cpath; |
| char cresolved_path[MAXPATHLEN]; |
| wchar_t *wresolved_path; |
| char *res; |
| size_t r; |
| cpath = _Py_wchar2char(path, NULL); |
| if (cpath == NULL) { |
| errno = EINVAL; |
| return NULL; |
| } |
| res = realpath(cpath, cresolved_path); |
| PyMem_Free(cpath); |
| if (res == NULL) |
| return NULL; |
| |
| wresolved_path = _Py_char2wchar(cresolved_path, &r); |
| if (wresolved_path == NULL) { |
| errno = EINVAL; |
| return NULL; |
| } |
| if (resolved_path_size <= r) { |
| PyMem_RawFree(wresolved_path); |
| errno = EINVAL; |
| return NULL; |
| } |
| wcsncpy(resolved_path, wresolved_path, resolved_path_size); |
| PyMem_RawFree(wresolved_path); |
| return resolved_path; |
| } |
| #endif |
| |
| /* Get the current directory. size is the buffer size in wide characters |
| including the null character. Decode the path from the locale encoding. |
| Return NULL on error. */ |
| |
| wchar_t* |
| _Py_wgetcwd(wchar_t *buf, size_t size) |
| { |
| #ifdef MS_WINDOWS |
| int isize = (int)Py_MIN(size, INT_MAX); |
| return _wgetcwd(buf, isize); |
| #else |
| char fname[MAXPATHLEN]; |
| wchar_t *wname; |
| size_t len; |
| |
| if (getcwd(fname, Py_ARRAY_LENGTH(fname)) == NULL) |
| return NULL; |
| wname = _Py_char2wchar(fname, &len); |
| if (wname == NULL) |
| return NULL; |
| if (size <= len) { |
| PyMem_RawFree(wname); |
| return NULL; |
| } |
| wcsncpy(buf, wname, size); |
| 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; |
| DWORD ftype; |
| #endif |
| |
| if (!_PyVerify_fd(fd)) { |
| PyErr_SetFromErrno(PyExc_OSError); |
| return -1; |
| } |
| |
| #ifdef MS_WINDOWS |
| handle = (HANDLE)_get_osfhandle(fd); |
| if (handle == INVALID_HANDLE_VALUE) { |
| PyErr_SetFromWindowsErr(0); |
| return -1; |
| } |
| |
| /* get the file type, ignore the error if it failed */ |
| ftype = GetFileType(handle); |
| |
| Py_BEGIN_ALLOW_THREADS |
| fd = dup(fd); |
| Py_END_ALLOW_THREADS |
| if (fd < 0) { |
| PyErr_SetFromErrno(PyExc_OSError); |
| return -1; |
| } |
| |
| /* Character files like console cannot be make non-inheritable */ |
| if (ftype != FILE_TYPE_CHAR) { |
| if (_Py_set_inheritable(fd, 0, NULL) < 0) { |
| close(fd); |
| return -1; |
| } |
| } |
| #elif defined(HAVE_FCNTL_H) && defined(F_DUPFD_CLOEXEC) |
| Py_BEGIN_ALLOW_THREADS |
| fd = fcntl(fd, F_DUPFD_CLOEXEC, 0); |
| Py_END_ALLOW_THREADS |
| if (fd < 0) { |
| PyErr_SetFromErrno(PyExc_OSError); |
| return -1; |
| } |
| |
| #else |
| Py_BEGIN_ALLOW_THREADS |
| fd = dup(fd); |
| Py_END_ALLOW_THREADS |
| if (fd < 0) { |
| PyErr_SetFromErrno(PyExc_OSError); |
| return -1; |
| } |
| |
| if (_Py_set_inheritable(fd, 0, NULL) < 0) { |
| close(fd); |
| return -1; |
| } |
| #endif |
| return fd; |
| } |
| |