### 导航 - [索引](../genindex.xhtml "总目录") - [模块](../py-modindex.xhtml "Python 模块索引") | - [下一页](import.xhtml "导入模块") | - [上一页](utilities.xhtml "工具") | -  - [Python](https://www.python.org/) » - zh\_CN 3.7.3 [文档](../index.xhtml) » - [Python/C API 参考手册](index.xhtml) » - [工具](utilities.xhtml) » - $('.inline-search').show(0); | # 操作系统实用程序 [PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyOS_FSPath`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*path*)*Return value: New reference.*Return the file system representation for *path*. If the object is a [`str`](../library/stdtypes.xhtml#str "str") or [`bytes`](../library/stdtypes.xhtml#bytes "bytes") object, then its reference count is incremented. If the object implements the [`os.PathLike`](../library/os.xhtml#os.PathLike "os.PathLike") interface, then [`__fspath__()`](../library/os.xhtml#os.PathLike.__fspath__ "os.PathLike.__fspath__") is returned as long as it is a [`str`](../library/stdtypes.xhtml#str "str") or [`bytes`](../library/stdtypes.xhtml#bytes "bytes") object. Otherwise [`TypeError`](../library/exceptions.xhtml#TypeError "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`](init.xhtml#c.Py_InteractiveFlag "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 `'<stdin>'` 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. 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. 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. 3\.7 新版功能. 参见 [`os.register_at_fork()`](../library/os.xhtml#os.register_at_fork "os.register_at_fork") allows registering custom Python functions to be called by [`PyOS_BeforeFork()`](#c.PyOS_BeforeFork "PyOS_BeforeFork"), [`PyOS_AfterFork_Parent()`](#c.PyOS_AfterFork_Parent "PyOS_AfterFork_Parent") and [`PyOS_AfterFork_Child()`](#c.PyOS_AfterFork_Child "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()`](#c.PyOS_AfterFork_Child "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](../library/codecs.xhtml#surrogateescape): 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: - `UTF-8` 在 macOS 和 Android上; - `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. Return a pointer to a newly allocated wide character string, use [`PyMem_RawFree()`](memory.xhtml#c.PyMem_RawFree "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()`](#c.Py_EncodeLocale "Py_EncodeLocale") function to encode the character string back to a byte string. 参见 The [`PyUnicode_DecodeFSDefaultAndSize()`](unicode.xhtml#c.PyUnicode_DecodeFSDefaultAndSize "PyUnicode_DecodeFSDefaultAndSize") and [`PyUnicode_DecodeLocaleAndSize()`](unicode.xhtml#c.PyUnicode_DecodeLocaleAndSize "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. 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](../library/codecs.xhtml#surrogateescape): surrogate characters in the range U+DC80..U+DCFF are converted to bytes 0x80..0xFF. Encoding, highest priority to lowest priority: - `UTF-8` 在 macOS 和 Android上; - `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. 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()`](memory.xhtml#c.PyMem_Free "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()`](#c.Py_DecodeLocale "Py_DecodeLocale") function to decode the bytes string back to a wide character string. 在 3.7 版更改: The function now uses the UTF-8 encoding in the UTF-8 mode. 参见 The [`PyUnicode_EncodeFSDefault()`](unicode.xhtml#c.PyUnicode_EncodeFSDefault "PyUnicode_EncodeFSDefault") and [`PyUnicode_EncodeLocale()`](unicode.xhtml#c.PyUnicode_EncodeLocale "PyUnicode_EncodeLocale") functions. 3\.5 新版功能. 在 3.7 版更改: The function now supports the UTF-8 mode. # 系统功能 These are utility functions that make functionality from the [`sys`](../library/sys.xhtml#module-sys "sys: Access system-specific parameters and functions.") module accessible to C code. They all work with the current interpreter thread's [`sys`](../library/sys.xhtml#module-sys "sys: Access system-specific parameters and functions.") module's dict, which is contained in the internal thread state structure. [PyObject](structures.xhtml#c.PyObject "PyObject") \*`PySys_GetObject`(const char *\*name*)*Return value: Borrowed reference.*Return the object *name* from the [`sys`](../library/sys.xhtml#module-sys "sys: Access system-specific parameters and functions.") module or *NULL* if it does not exist, without setting an exception. int `PySys_SetObject`(const char *\*name*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*v*)Set *name* in the [`sys`](../library/sys.xhtml#module-sys "sys: Access system-specific parameters and functions.") module to *v* unless *v* is *NULL*, in which case *name* is deleted from the sys module. Returns `0` on success, `-1`on error. void `PySys_ResetWarnOptions`()Reset [`sys.warnoptions`](../library/sys.xhtml#sys.warnoptions "sys.warnoptions") to an empty list. This function may be called prior to [`Py_Initialize()`](init.xhtml#c.Py_Initialize "Py_Initialize"). void `PySys_AddWarnOption`(const wchar\_t *\*s*)Append *s* to [`sys.warnoptions`](../library/sys.xhtml#sys.warnoptions "sys.warnoptions"). This function must be called prior to [`Py_Initialize()`](init.xhtml#c.Py_Initialize "Py_Initialize") in order to affect the warnings filter list. void `PySys_AddWarnOptionUnicode`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*unicode*)Append *unicode* to [`sys.warnoptions`](../library/sys.xhtml#sys.warnoptions "sys.warnoptions"). Note: this function is not currently usable from outside the CPython implementation, as it must be called prior to the implicit import of [`warnings`](../library/warnings.xhtml#module-warnings "warnings: Issue warning messages and control their disposition.") in [`Py_Initialize()`](init.xhtml#c.Py_Initialize "Py_Initialize") to be effective, but can't be called until enough of the runtime has been initialized to permit the creation of Unicode objects. void `PySys_SetPath`(const wchar\_t *\*path*)Set [`sys.path`](../library/sys.xhtml#sys.path "sys.path") to a list object of paths found in *path* which should be a list of paths separated with the platform's search path delimiter (`:` on Unix, `;` on Windows). void `PySys_WriteStdout`(const char *\*format*, ...)Write the output string described by *format* to [`sys.stdout`](../library/sys.xhtml#sys.stdout "sys.stdout"). No exceptions are raised, even if truncation occurs (see below). *format* should limit the total size of the formatted output string to 1000 bytes or less -- after 1000 bytes, the output string is truncated. In particular, this means that no unrestricted "%s" formats should occur; these should be limited using "%.<N>s" where <N> is a decimal number calculated so that <N> plus the maximum size of other formatted text does not exceed 1000 bytes. Also watch out for "%f", which can print hundreds of digits for very large numbers. If a problem occurs, or [`sys.stdout`](../library/sys.xhtml#sys.stdout "sys.stdout") is unset, the formatted message is written to the real (C level) *stdout*. void `PySys_WriteStderr`(const char *\*format*, ...)As [`PySys_WriteStdout()`](#c.PySys_WriteStdout "PySys_WriteStdout"), but write to [`sys.stderr`](../library/sys.xhtml#sys.stderr "sys.stderr") or *stderr*instead. void `PySys_FormatStdout`(const char *\*format*, ...)Function similar to PySys\_WriteStdout() but format the message using [`PyUnicode_FromFormatV()`](unicode.xhtml#c.PyUnicode_FromFormatV "PyUnicode_FromFormatV") and don't truncate the message to an arbitrary length. 3\.2 新版功能. void `PySys_FormatStderr`(const char *\*format*, ...)As [`PySys_FormatStdout()`](#c.PySys_FormatStdout "PySys_FormatStdout"), but write to [`sys.stderr`](../library/sys.xhtml#sys.stderr "sys.stderr") or *stderr*instead. 3\.2 新版功能. void `PySys_AddXOption`(const wchar\_t *\*s*)Parse *s* as a set of [`-X`](../using/cmdline.xhtml#id5) options and add them to the current options mapping as returned by [`PySys_GetXOptions()`](#c.PySys_GetXOptions "PySys_GetXOptions"). This function may be called prior to [`Py_Initialize()`](init.xhtml#c.Py_Initialize "Py_Initialize"). 3\.2 新版功能. [PyObject](structures.xhtml#c.PyObject "PyObject") \*`PySys_GetXOptions`()*Return value: Borrowed reference.*Return the current dictionary of [`-X`](../using/cmdline.xhtml#id5) options, similarly to [`sys._xoptions`](../library/sys.xhtml#sys._xoptions "sys._xoptions"). On error, *NULL* is returned and an exception is set. 3\.2 新版功能. # 过程控制 void `Py_FatalError`(const char *\*message*)Print a fatal error message and kill the process. No cleanup is performed. This function should only be invoked when a condition is detected that would make it dangerous to continue using the Python interpreter; e.g., when the object administration appears to be corrupted. On Unix, the standard C library function `abort()` is called which will attempt to produce a `core`file. void `Py_Exit`(int *status*)Exit the current process. This calls [`Py_FinalizeEx()`](init.xhtml#c.Py_FinalizeEx "Py_FinalizeEx") and then calls the standard C library function `exit(status)`. If [`Py_FinalizeEx()`](init.xhtml#c.Py_FinalizeEx "Py_FinalizeEx")indicates an error, the exit status is set to 120. 在 3.6 版更改: Errors from finalization no longer ignored. int `Py_AtExit`(void (*\*func*)())Register a cleanup function to be called by [`Py_FinalizeEx()`](init.xhtml#c.Py_FinalizeEx "Py_FinalizeEx"). The cleanup function will be called with no arguments and should return no value. At most 32 cleanup functions can be registered. When the registration is successful, [`Py_AtExit()`](#c.Py_AtExit "Py_AtExit") returns `0`; on failure, it returns `-1`. The cleanup function registered last is called first. Each cleanup function will be called at most once. Since Python's internal finalization will have completed before the cleanup function, no Python APIs should be called by *func*. ### 导航 - [索引](../genindex.xhtml "总目录") - [模块](../py-modindex.xhtml "Python 模块索引") | - [下一页](import.xhtml "导入模块") | - [上一页](utilities.xhtml "工具") | -  - [Python](https://www.python.org/) » - zh\_CN 3.7.3 [文档](../index.xhtml) » - [Python/C API 参考手册](index.xhtml) » - [工具](utilities.xhtml) » - $('.inline-search').show(0); | © [版权所有](../copyright.xhtml) 2001-2019, Python Software Foundation. Python 软件基金会是一个非盈利组织。 [请捐助。](https://www.python.org/psf/donations/) 最后更新于 5月 21, 2019. [发现了问题](../bugs.xhtml)？ 使用[Sphinx](http://sphinx.pocoo.org/)1.8.4 创建。