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Title: Operating System Utilities — Python 3.14.2 documentation

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Description: System Functions: 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 conta...

Open Graph Description: System Functions: 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 conta...

Opengraph URL: https://docs.python.org/3/c-api/sys.html

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og:image:alt	System Functions: 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 conta...
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Links:

	https://www.python.org/
Table of Contents	https://docs.python.org/3/contents.html
Operating System Utilities	https://docs.python.org/3/c-api/sys.html
System Functions	https://docs.python.org/3/c-api/sys.html#system-functions
Process Control	https://docs.python.org/3/c-api/sys.html#process-control
Utilities	https://docs.python.org/3/c-api/utilities.html
Importing Modules	https://docs.python.org/3/c-api/import.html
Report a bug	https://docs.python.org/3/bugs.html
Show source	https://github.com/python/cpython/blob/main/Doc/c-api/sys.rst?plain=1
index	https://docs.python.org/3/genindex.html
modules	https://docs.python.org/3/py-modindex.html
next	https://docs.python.org/3/c-api/import.html
previous	https://docs.python.org/3/c-api/utilities.html
Python	https://www.python.org/
3.14.2 Documentation	https://docs.python.org/3/index.html
Python/C API Reference Manual	https://docs.python.org/3/c-api/index.html
Utilities	https://docs.python.org/3/c-api/utilities.html
Operating System Utilities	https://docs.python.org/3/c-api/sys.html
¶	https://docs.python.org/3/c-api/sys.html#operating-system-utilities
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_FSPath
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
str	https://docs.python.org/3/library/stdtypes.html#str
bytes	https://docs.python.org/3/library/stdtypes.html#bytes
strong reference	https://docs.python.org/3/glossary.html#term-strong-reference
os.PathLike	https://docs.python.org/3/library/os.html#os.PathLike
__fspath__()	https://docs.python.org/3/library/os.html#os.PathLike.__fspath__
str	https://docs.python.org/3/library/stdtypes.html#str
bytes	https://docs.python.org/3/library/stdtypes.html#bytes
TypeError	https://docs.python.org/3/library/exceptions.html#TypeError
¶	https://docs.python.org/3/c-api/sys.html#c.Py_FdIsInteractive
PyConfig.interactive	https://docs.python.org/3/c-api/init_config.html#c.PyConfig.interactive
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_BeforeFork
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
“main” thread	https://docs.python.org/3/c-api/init.html#fork-and-threads
“main” interpreter	https://docs.python.org/3/c-api/init.html#sub-interpreter-support
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_AfterFork_Parent
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
“main” thread	https://docs.python.org/3/c-api/init.html#fork-and-threads
“main” interpreter	https://docs.python.org/3/c-api/init.html#sub-interpreter-support
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_AfterFork_Child
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
“main” thread	https://docs.python.org/3/c-api/init.html#fork-and-threads
“main” interpreter	https://docs.python.org/3/c-api/init.html#sub-interpreter-support
os.register_at_fork()	https://docs.python.org/3/library/os.html#os.register_at_fork
PyOS_BeforeFork()	https://docs.python.org/3/c-api/sys.html#c.PyOS_BeforeFork
PyOS_AfterFork_Parent()	https://docs.python.org/3/c-api/sys.html#c.PyOS_AfterFork_Parent
PyOS_AfterFork_Child()	https://docs.python.org/3/c-api/sys.html#c.PyOS_AfterFork_Child
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_AfterFork
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PyOS_AfterFork_Child()	https://docs.python.org/3/c-api/sys.html#c.PyOS_AfterFork_Child
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_CheckStack
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_sighandler_t
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PyOS_sighandler_t	https://docs.python.org/3/c-api/sys.html#c.PyOS_sighandler_t
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_getsig
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PyOS_sighandler_t	https://docs.python.org/3/c-api/sys.html#c.PyOS_sighandler_t
PyOS_sighandler_t	https://docs.python.org/3/c-api/sys.html#c.PyOS_sighandler_t
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_setsig
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
¶	https://docs.python.org/3/c-api/sys.html#c.PyOS_InterruptOccurred
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PyErr_CheckSignals()	https://docs.python.org/3/c-api/exceptions.html#c.PyErr_CheckSignals
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
¶	https://docs.python.org/3/c-api/sys.html#c.Py_DecodeLocale
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PyConfig	https://docs.python.org/3/c-api/init_config.html#c.PyConfig
PyConfig_SetBytesString()	https://docs.python.org/3/c-api/init_config.html#c.PyConfig_SetBytesString
Python is preinitialized	https://docs.python.org/3/c-api/init_config.html#c-preinit
Python is preinitialized	https://docs.python.org/3/c-api/init_config.html#c-preinit
Py_PreInitialize()	https://docs.python.org/3/c-api/init_config.html#c.Py_PreInitialize
filesystem encoding and error handler	https://docs.python.org/3/glossary.html#term-filesystem-encoding-and-error-handler
surrogateescape error handler	https://docs.python.org/3/library/codecs.html#surrogateescape
PyMem_RawFree()	https://docs.python.org/3/c-api/memory.html#c.PyMem_RawFree
filesystem encoding and error handler	https://docs.python.org/3/glossary.html#term-filesystem-encoding-and-error-handler
PyConfig_Read()	https://docs.python.org/3/c-api/init_config.html#c.PyConfig_Read
filesystem_encoding	https://docs.python.org/3/c-api/init_config.html#c.PyConfig.filesystem_encoding
filesystem_errors	https://docs.python.org/3/c-api/init_config.html#c.PyConfig.filesystem_errors
PyConfig	https://docs.python.org/3/c-api/init_config.html#c.PyConfig
Py_EncodeLocale()	https://docs.python.org/3/c-api/sys.html#c.Py_EncodeLocale
PyUnicode_DecodeFSDefaultAndSize()	https://docs.python.org/3/c-api/unicode.html#c.PyUnicode_DecodeFSDefaultAndSize
PyUnicode_DecodeLocaleAndSize()	https://docs.python.org/3/c-api/unicode.html#c.PyUnicode_DecodeLocaleAndSize
Python UTF-8 Mode	https://docs.python.org/3/library/os.html#utf8-mode
PyPreConfig.legacy_windows_fs_encoding	https://docs.python.org/3/c-api/init_config.html#c.PyPreConfig.legacy_windows_fs_encoding
¶	https://docs.python.org/3/c-api/sys.html#c.Py_EncodeLocale
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
filesystem encoding and error handler	https://docs.python.org/3/glossary.html#term-filesystem-encoding-and-error-handler
surrogateescape error handler	https://docs.python.org/3/library/codecs.html#surrogateescape
PyMem_Free()	https://docs.python.org/3/c-api/memory.html#c.PyMem_Free
filesystem encoding and error handler	https://docs.python.org/3/glossary.html#term-filesystem-encoding-and-error-handler
PyConfig_Read()	https://docs.python.org/3/c-api/init_config.html#c.PyConfig_Read
filesystem_encoding	https://docs.python.org/3/c-api/init_config.html#c.PyConfig.filesystem_encoding
filesystem_errors	https://docs.python.org/3/c-api/init_config.html#c.PyConfig.filesystem_errors
PyConfig	https://docs.python.org/3/c-api/init_config.html#c.PyConfig
Py_DecodeLocale()	https://docs.python.org/3/c-api/sys.html#c.Py_DecodeLocale
Python is preinitialized	https://docs.python.org/3/c-api/init_config.html#c-preinit
Py_PreInitialize()	https://docs.python.org/3/c-api/init_config.html#c.Py_PreInitialize
PyUnicode_EncodeFSDefault()	https://docs.python.org/3/c-api/unicode.html#c.PyUnicode_EncodeFSDefault
PyUnicode_EncodeLocale()	https://docs.python.org/3/c-api/unicode.html#c.PyUnicode_EncodeLocale
Python UTF-8 Mode	https://docs.python.org/3/library/os.html#utf8-mode
PyPreConfig.legacy_windows_fs_encoding	https://docs.python.org/3/c-api/init_config.html#c.PyPreConfig.legacy_windows_fs_encoding
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
¶	https://docs.python.org/3/c-api/sys.html#c.Py_fopen
str	https://docs.python.org/3/library/stdtypes.html#str
bytes	https://docs.python.org/3/library/stdtypes.html#bytes
path-like object	https://docs.python.org/3/glossary.html#term-path-like-object
Py_fclose()	https://docs.python.org/3/c-api/sys.html#c.Py_fclose
PEP 446	https://peps.python.org/pep-0446/
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
¶	https://docs.python.org/3/c-api/sys.html#c.Py_fclose
Py_fopen()	https://docs.python.org/3/c-api/sys.html#c.Py_fopen
Py_fclose()	https://docs.python.org/3/c-api/sys.html#c.Py_fclose
¶	https://docs.python.org/3/c-api/sys.html#system-functions
sys	https://docs.python.org/3/library/sys.html#module-sys
sys	https://docs.python.org/3/library/sys.html#module-sys
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_GetObject
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
sys	https://docs.python.org/3/library/sys.html#module-sys
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_SetObject
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
sys	https://docs.python.org/3/library/sys.html#module-sys
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_ResetWarnOptions
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
sys.warnoptions	https://docs.python.org/3/library/sys.html#sys.warnoptions
Py_Initialize()	https://docs.python.org/3/c-api/init.html#c.Py_Initialize
sys.warnoptions	https://docs.python.org/3/library/sys.html#sys.warnoptions
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_WriteStdout
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
sys.stdout	https://docs.python.org/3/library/sys.html#sys.stdout
sys.stdout	https://docs.python.org/3/library/sys.html#sys.stdout
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_WriteStderr
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PySys_WriteStdout()	https://docs.python.org/3/c-api/sys.html#c.PySys_WriteStdout
sys.stderr	https://docs.python.org/3/library/sys.html#sys.stderr
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_FormatStdout
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PyUnicode_FromFormatV()	https://docs.python.org/3/c-api/unicode.html#c.PyUnicode_FromFormatV
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_FormatStderr
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PySys_FormatStdout()	https://docs.python.org/3/c-api/sys.html#c.PySys_FormatStdout
sys.stderr	https://docs.python.org/3/library/sys.html#sys.stderr
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_GetXOptions
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
-X	https://docs.python.org/3/using/cmdline.html#cmdoption-X
sys._xoptions	https://docs.python.org/3/library/sys.html#sys._xoptions
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_Audit
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
Py_BuildValue()	https://docs.python.org/3/c-api/arg.html#c.Py_BuildValue
Py_ssize_t	https://docs.python.org/3/c-api/intro.html#c.Py_ssize_t
sys.audit()	https://docs.python.org/3/library/sys.html#sys.audit
PySys_AuditTuple()	https://docs.python.org/3/c-api/sys.html#c.PySys_AuditTuple
Py_ssize_t	https://docs.python.org/3/c-api/intro.html#c.Py_ssize_t
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_AuditTuple
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PySys_Audit()	https://docs.python.org/3/c-api/sys.html#c.PySys_Audit
tuple	https://docs.python.org/3/library/stdtypes.html#tuple
Py_AuditHookFunction	https://docs.python.org/3/c-api/sys.html#c.Py_AuditHookFunction
¶	https://docs.python.org/3/c-api/sys.html#c.PySys_AddAuditHook
Py_Initialize()	https://docs.python.org/3/c-api/init.html#c.Py_Initialize
Exception	https://docs.python.org/3/library/exceptions.html#Exception
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
PEP 578	https://peps.python.org/pep-0578/
audit events table	https://docs.python.org/3/library/audit_events.html#audit-events
Exception	https://docs.python.org/3/library/exceptions.html#Exception
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
¶	https://docs.python.org/3/c-api/sys.html#c.Py_AuditHookFunction
PySys_Audit()	https://docs.python.org/3/c-api/sys.html#c.PySys_Audit
PySys_AuditTuple()	https://docs.python.org/3/c-api/sys.html#c.PySys_AuditTuple
PyTupleObject	https://docs.python.org/3/c-api/tuple.html#c.PyTupleObject
¶	https://docs.python.org/3/c-api/sys.html#process-control
¶	https://docs.python.org/3/c-api/sys.html#c.Py_FatalError
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
¶	https://docs.python.org/3/c-api/sys.html#c.Py_Exit
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
Py_FinalizeEx()	https://docs.python.org/3/c-api/init.html#c.Py_FinalizeEx
Py_FinalizeEx()	https://docs.python.org/3/c-api/init.html#c.Py_FinalizeEx
¶	https://docs.python.org/3/c-api/sys.html#c.Py_AtExit
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
Py_FinalizeEx()	https://docs.python.org/3/c-api/init.html#c.Py_FinalizeEx
Py_AtExit()	https://docs.python.org/3/c-api/sys.html#c.Py_AtExit
PyUnstable_AtExit()	https://docs.python.org/3/c-api/init.html#c.PyUnstable_AtExit
Table of Contents	https://docs.python.org/3/contents.html
Operating System Utilities	https://docs.python.org/3/c-api/sys.html
System Functions	https://docs.python.org/3/c-api/sys.html#system-functions
Process Control	https://docs.python.org/3/c-api/sys.html#process-control
Utilities	https://docs.python.org/3/c-api/utilities.html
Importing Modules	https://docs.python.org/3/c-api/import.html
Report a bug	https://docs.python.org/3/bugs.html
Show source	https://github.com/python/cpython/blob/main/Doc/c-api/sys.rst?plain=1
index	https://docs.python.org/3/genindex.html
modules	https://docs.python.org/3/py-modindex.html
next	https://docs.python.org/3/c-api/import.html
previous	https://docs.python.org/3/c-api/utilities.html
Python	https://www.python.org/
3.14.2 Documentation	https://docs.python.org/3/index.html
Python/C API Reference Manual	https://docs.python.org/3/c-api/index.html
Utilities	https://docs.python.org/3/c-api/utilities.html
Operating System Utilities	https://docs.python.org/3/c-api/sys.html
Copyright	https://docs.python.org/3/copyright.html
History and License	https://docs.python.org/license.html
Please donate.	https://www.python.org/psf/donations/
Found a bug	https://docs.python.org/bugs.html
Sphinx	https://www.sphinx-doc.org/

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