Py_FdIsInteractive(FILE *fp, const char *filename)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 '???'.PyOS_AfterFork()PyOS_CheckStack()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_getsig(int i)sigaction() or signal(). Do not call those functions directly! PyOS_sighandler_t is a typedef alias for void (*)(int).PyOS_setsig(int i, PyOS_sighandler_t h)sigaction() or signal(). Do not call those functions directly! PyOS_sighandler_t is a typedef alias for void (*)(int).
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.
PySys_GetObject(char *name)Return value: Borrowed reference.
Return the object name from the sys module or NULL if it does
not exist, without setting an exception.
PySys_GetFile(char *name, FILE *def)FILE* associated with the object name in the sys module, or def if name is not in the module or is not associated with a FILE*.PySys_SetObject(char *name, PyObject *v)sys module to v unless v is NULL, in which case name is deleted from the sys module. Returns 0 on success, -1 on error.PySys_ResetWarnOptions()sys.warnoptions to an empty list.PySys_AddWarnOption(char *s)sys.warnoptions.PySys_SetPath(char *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).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.
PySys_WriteStderr(const char *format, ...)sys.stderr or stderr instead.
Py_FatalError(const char *message)abort() is called which will attempt to produce a core file.Py_Exit(int status)Py_Finalize() and then calls the standard C library function exit(status).Py_AtExit(void (*func)())Py_Finalize(). 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() 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.