操作系统实用工具 ¶

PyObject * PyOS_FSPath ( PyObject  *path ) ¶

返回值：新引用。

返回文件系统表示为 path 。若对象是 str or bytes 对象，则会递增其引用计数。若对象实现 os.PathLike 接口，那么 __fspath__() is returned as long as it is a str or bytes object. Otherwise TypeError is raised and NULL 被返回。

3.6 版新增。

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 '<stdin>' or '???' .

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.

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() 。不要直接调用这些函数！ 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() 。不要直接调用这些函数！ PyOS_sighandler_t is a typedef alias for void (*)(int) .

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

解码字节字符串从区域设置编码采用 替代转义错误处理程序 : 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.

编码，最高优先级到最低优先级：

• UTF-8 在 macOS 和 Android；
• ASCII 若 LC_CTYPE 区域设置是 "C" , nl_langinfo(CODESET) 返回 ASCII 编码 (或别名)，和 mbstowcs() and wcstombs() functions use the ISO-8859-1 编码。
• the current locale encoding ( LC_CTYPE 区域设置)。

Return a pointer to a newly allocated wide character string, use PyMem_RawFree() 来释放内存。若尺寸不是 NULL , write the number of wide characters excluding the null character into *size .

返回 NULL 当解码错误或内存分配出错时。若 size 不是 NULL , *size 被设为 (size_t)-1 当内存出错时或设为 (size_t)-2 当解码错误时。

解码错误应从不发生，除非 C 库存在 Bug。

使用 Py_EncodeLocale() 函数将字符串编码回字节字符串。

另请参阅

PyUnicode_DecodeFSDefaultAndSize() and PyUnicode_DecodeLocaleAndSize() 函数。

3.5 版新增。

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

将宽字符串编码成区域设置编码采用 替代转义错误处理程序 : surrogate characters in the range U+DC80..U+DCFF are converted to bytes 0x80..0xFF.

编码，最高优先级到最低优先级：

• UTF-8 在 macOS 和 Android；
• ASCII 若 LC_CTYPE 区域设置是 "C" , nl_langinfo(CODESET) 返回 ASCII 编码 (或别名)，和 mbstowcs() and wcstombs() functions uses the ISO-8859-1 编码。
• 当前区域设置编码。

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

若 error_pos 不是 NULL , *error_pos is set to the index of the invalid character on encoding error, or set to (size_t)-1 否则。

使用 Py_DecodeLocale() 函数将字节字符串解码回宽字符串。

另请参阅

PyUnicode_EncodeFSDefault() and PyUnicode_EncodeLocale() 函数。

3.5 版新增。

系统函数 ¶

These are utility functions that make functionality from the sys module accessible to C code. They all work with the current interpreter thread’s sys module’s dict, which is contained in the internal thread state structure.

PyObject * PySys_GetObject ( const char  *name ) ¶

返回值：借位引用。

返回对象 name 从 sys 模块或 NULL 若不存在，则不设置异常。

int PySys_SetObject ( const char  *name , PyObject  *v ) ¶

Set name 在 sys module to v unless v is NULL , in which case name is deleted from the sys module. Returns 0 当成功时， -1 当出错时。

void PySys_ResetWarnOptions ( ) ¶

重置 sys.warnoptions to an empty list.

void PySys_AddWarnOption ( wchar_t  *s ) ¶

追加 s to sys.warnoptions .

void PySys_AddWarnOptionUnicode ( PyObject  *unicode ) ¶

追加 unicode to sys.warnoptions .

void PySys_SetPath ( wchar_t  *path ) ¶

Set 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 ( : 在 Unix， ; 在 Windows)。

void PySys_WriteStdout ( const char  *format , ... ) ¶

Write the output string described by format to 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 is unset, the formatted message is written to the real (C level) stdout .

void PySys_WriteStderr ( const char  *format , ... ) ¶

As PySys_WriteStdout() ，但写入 sys.stderr or stderr 代替。

void PySys_FormatStdout ( const char  *format , ... ) ¶

Function similar to PySys_WriteStdout() but format the message using PyUnicode_FromFormatV() and don’t truncate the message to an arbitrary length.

3.2 版新增。

void PySys_FormatStderr ( const char  *format , ... ) ¶

As PySys_FormatStdout() ，但写入 sys.stderr or stderr 代替。

3.2 版新增。

void PySys_AddXOption ( const wchar_t  *s ) ¶

剖析 s as a set of -X options and add them to the current options mapping as returned by PySys_GetXOptions() .

3.2 版新增。

PyObject * PySys_GetXOptions ( ) ¶

返回值：借位引用。

返回当前字典为 -X 选项，类似于 sys._xoptions 。当出错时， NULL 被返回并设置异常。

3.2 版新增。

进程控制 ¶

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 文件。

void Py_Exit ( int  status ) ¶

退出当前进程。这调用 Py_FinalizeEx() 然后调用标准 C 库函数 exit(status) 。若 Py_FinalizeEx() 指示出错，退出状态被设为 120。

3.6 版改变： 不再忽略来自定稿的错误。

int Py_AtExit ( void ( *func )() ) ¶

Register a cleanup function to be called by 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() 返回 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 .

内容表

• 操作系统实用工具
• 系统函数
• 进程控制

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