操作系统实用程序

• PyObject* PyOS_FSPath(PyObject *path)

• Return value: New reference.

  Return the file system representation for path. If the object is a str or bytes object, then its reference count is incremented. If the object implements the os.PathLike interface, then __fspath__() is returned as long as it is a str or bytes object. Otherwise TypeError is raised and NULL is returned.

  3.6 新版功能.

• int Py_FdIsInteractive(FILE *fp, const char *filename)

• Return true (nonzero) if the standard I/O file fp with name filename is deemed interactive. This is the case for files for which isatty(fileno(fp)) is true. If the global flag Py_InteractiveFlag is true, this function also returns true if the filename pointer is NULL or if the name is equal to one of the strings '' or '???'.

• void PyOS_BeforeFork()

• Function to prepare some internal state before a process fork. This should be called before calling fork() or any similar function that clones the current process. Only available on systems where fork() is defined.

  警告

  The C fork() call should only be made from the "main" thread (of the "main" interpreter). The same is true for PyOS_BeforeFork().

  3.7 新版功能.

• void PyOS_AfterFork_Parent()

• Function to update some internal state after a process fork. This should be called from the parent process after calling fork() or any similar function that clones the current process, regardless of whether process cloning was successful. Only available on systems where fork() is defined.

  警告

  The C fork() call should only be made from the "main" thread (of the "main" interpreter). The same is true for PyOS_AfterFork_Parent().

  3.7 新版功能.

• void PyOS_AfterFork_Child()

• Function to update internal interpreter state after a process fork. This must be called from the child process after calling fork(), or any similar function that clones the current process, if there is any chance the process will call back into the Python interpreter. Only available on systems where fork() is defined.

  警告

  The C fork() call should only be made from the "main" thread (of the "main" interpreter). The same is true for PyOS_AfterFork_Child().

  3.7 新版功能.

  参见

  os.register_at_fork() allows registering custom Python functions to be called by PyOS_BeforeFork(), PyOS_AfterFork_Parent() and PyOS_AfterFork_Child().

• void PyOS_AfterFork()

• Function to update some internal state after a process fork; this should be called in the new process if the Python interpreter will continue to be used. If a new executable is loaded into the new process, this function does not need to be called.

  3.7 版后已移除: This function is superseded by PyOS_AfterFork_Child().

• int PyOS_CheckStack()

• Return true when the interpreter runs out of stack space. This is a reliable check, but is only available when USE_STACKCHECK is defined (currently on Windows using the Microsoft Visual C++ compiler). USE_STACKCHECK will be defined automatically; you should never change the definition in your own code.

• PyOS_sighandler_t PyOS_getsig(int i)

• Return the current signal handler for signal i. This is a thin wrapper around either sigaction() or signal(). Do not call those functions directly! PyOS_sighandler_t is a typedef alias for void (*)(int).

• PyOS_sighandler_t PyOS_setsig(int i, PyOS_sighandler_t h)

• Set the signal handler for signal i to be h; return the old signal handler. This is a thin wrapper around either sigaction() or signal(). Do not call those functions directly! PyOS_sighandler_t is a typedef alias for void (*)(int).

• wchar_t* Py_DecodeLocale(const char* arg, size_t *size)

• 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.

  Encoding, highest priority to lowest priority:

  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.

  参见

  The PyUnicode_DecodeFSDefaultAndSize() and PyUnicode_DecodeLocaleAndSize() functions.

  3.5 新版功能.

  在 3.7 版更改: The function now uses the UTF-8 encoding in the UTF-8 mode.

  在 3.8 版更改: The function now uses the UTF-8 encoding on Windows if Py_LegacyWindowsFSEncodingFlag is zero;

  • UTF-8 on macOS, Android, and VxWorks;

  • UTF-8 on Windows if Py_LegacyWindowsFSEncodingFlag is zero;

  • UTF-8 if the Python UTF-8 mode is enabled;

  • ASCII if the LC_CTYPE locale is "C", nl_langinfo(CODESET) returns the ASCII encoding (or an alias), and mbstowcs() and wcstombs() functions uses the ISO-8859-1 encoding.

  • the current locale encoding.

• char* Py_EncodeLocale(const wchar_t *text, size_t *error_pos)

• 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.

  Encoding, highest priority to lowest priority:

  The function uses the UTF-8 encoding in the Python UTF-8 mode.

  Return a pointer to a newly allocated byte string, use PyMem_Free() to free the memory. Return NULL on encoding error 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.

  参见

  The PyUnicode_EncodeFSDefault() and PyUnicode_EncodeLocale() functions.

  3.5 新版功能.

  在 3.7 版更改: The function now uses the UTF-8 encoding in the UTF-8 mode.

  在 3.8 版更改: The function now uses the UTF-8 encoding on Windows if Py_LegacyWindowsFSEncodingFlag is zero;

  • UTF-8 on macOS, Android, and VxWorks;

  • UTF-8 on Windows if Py_LegacyWindowsFSEncodingFlag is zero;

  • UTF-8 if the Python UTF-8 mode is enabled;

  • ASCII if the LC_CTYPE locale is "C", nl_langinfo(CODESET) returns the ASCII encoding (or an alias), and mbstowcs() and wcstombs() functions uses the ISO-8859-1 encoding.

  • the current locale encoding.

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