Gecko [ fernandoquevedodop.com ]

Name	Size	Permission
2to3.html	70.96 KB	-rw-r--r--
__future__.html	20.75 KB	-rw-r--r--
__main__.html	44.87 KB	-rw-r--r--
_thread.html	30.39 KB	-rw-r--r--
abc.html	46.87 KB	-rw-r--r--
aifc.html	35.56 KB	-rw-r--r--
allos.html	34.33 KB	-rw-r--r--
archiving.html	17 KB	-rw-r--r--
argparse.html	300.89 KB	-rw-r--r--
array.html	37.28 KB	-rw-r--r--
ast.html	293.08 KB	-rw-r--r--
asynchat.html	37.41 KB	-rw-r--r--
asyncio-api-index.html	27.68 KB	-rw-r--r--
asyncio-dev.html	36.1 KB	-rw-r--r--
asyncio-eventloop.html	204.43 KB	-rw-r--r--
asyncio-exceptions.html	17.11 KB	-rw-r--r--
asyncio-future.html	38.23 KB	-rw-r--r--
asyncio-llapi-index.html	61.97 KB	-rw-r--r--
asyncio-platforms.html	21.77 KB	-rw-r--r--
asyncio-policy.html	39.56 KB	-rw-r--r--
asyncio-protocol.html	118.33 KB	-rw-r--r--
asyncio-queue.html	31.86 KB	-rw-r--r--
asyncio-stream.html	69.98 KB	-rw-r--r--
asyncio-subprocess.html	49.25 KB	-rw-r--r--
asyncio-sync.html	42.79 KB	-rw-r--r--
asyncio-task.html	109.14 KB	-rw-r--r--
asyncio.html	17.31 KB	-rw-r--r--
asyncore.html	49.36 KB	-rw-r--r--
atexit.html	22.87 KB	-rw-r--r--
audioop.html	46 KB	-rw-r--r--
audit_events.html	72.85 KB	-rw-r--r--
base64.html	48.09 KB	-rw-r--r--
bdb.html	66 KB	-rw-r--r--
binary.html	15.97 KB	-rw-r--r--
binascii.html	36.3 KB	-rw-r--r--
binhex.html	15.97 KB	-rw-r--r--
bisect.html	43.38 KB	-rw-r--r--
builtins.html	14.87 KB	-rw-r--r--
bz2.html	50.68 KB	-rw-r--r--
calendar.html	69.35 KB	-rw-r--r--
cgi.html	59.95 KB	-rw-r--r--
cgitb.html	19.96 KB	-rw-r--r--
chunk.html	22.21 KB	-rw-r--r--
cmath.html	43.89 KB	-rw-r--r--
cmd.html	50.42 KB	-rw-r--r--
code.html	35.38 KB	-rw-r--r--
codecs.html	157.96 KB	-rw-r--r--
codeop.html	18.26 KB	-rw-r--r--
collections.abc.html	79.17 KB	-rw-r--r--
collections.html	189.43 KB	-rw-r--r--
colorsys.html	17.31 KB	-rw-r--r--
compileall.html	50.68 KB	-rw-r--r--
concurrency.html	24.15 KB	-rw-r--r--
concurrent.futures.html	79.03 KB	-rw-r--r--
concurrent.html	11.56 KB	-rw-r--r--
configparser.html	159.4 KB	-rw-r--r--
constants.html	22.41 KB	-rw-r--r--
contextlib.html	117.2 KB	-rw-r--r--
contextvars.html	38.38 KB	-rw-r--r--
copy.html	17.92 KB	-rw-r--r--
copyreg.html	18.63 KB	-rw-r--r--
crypt.html	28.29 KB	-rw-r--r--
crypto.html	13.93 KB	-rw-r--r--
csv.html	82.89 KB	-rw-r--r--
ctypes.html	295.49 KB	-rw-r--r--
curses.ascii.html	32.04 KB	-rw-r--r--
curses.html	221.24 KB	-rw-r--r--
curses.panel.html	22.16 KB	-rw-r--r--
custominterp.html	11.85 KB	-rw-r--r--
dataclasses.html	113.16 KB	-rw-r--r--
datatypes.html	31.82 KB	-rw-r--r--
datetime.html	374.92 KB	-rw-r--r--
dbm.html	51.16 KB	-rw-r--r--
debug.html	17 KB	-rw-r--r--
decimal.html	270.12 KB	-rw-r--r--
development.html	32.34 KB	-rw-r--r--
devmode.html	31.72 KB	-rw-r--r--
dialog.html	43.03 KB	-rw-r--r--
difflib.html	111.99 KB	-rw-r--r--
dis.html	136.07 KB	-rw-r--r--
distribution.html	13.67 KB	-rw-r--r--
distutils.html	14.73 KB	-rw-r--r--
doctest.html	199.32 KB	-rw-r--r--
email.charset.html	31.92 KB	-rw-r--r--
email.compat32-message.html	97.74 KB	-rw-r--r--
email.contentmanager.html	37.02 KB	-rw-r--r--
email.encoders.html	18.47 KB	-rw-r--r--
email.errors.html	24.45 KB	-rw-r--r--
email.examples.html	60.49 KB	-rw-r--r--
email.generator.html	48.79 KB	-rw-r--r--
email.header.html	37.61 KB	-rw-r--r--
email.headerregistry.html	66.26 KB	-rw-r--r--
email.html	30.75 KB	-rw-r--r--
email.iterators.html	18.23 KB	-rw-r--r--
email.message.html	99.75 KB	-rw-r--r--
email.mime.html	44.89 KB	-rw-r--r--
email.parser.html	57.39 KB	-rw-r--r--
email.policy.html	84.24 KB	-rw-r--r--
email.utils.html	42.57 KB	-rw-r--r--
ensurepip.html	23.9 KB	-rw-r--r--
enum.html	151 KB	-rw-r--r--
errno.html	60.17 KB	-rw-r--r--
exceptions.html	108.44 KB	-rw-r--r--
faulthandler.html	31.5 KB	-rw-r--r--
fcntl.html	36.67 KB	-rw-r--r--
filecmp.html	32.08 KB	-rw-r--r--
fileformats.html	13.52 KB	-rw-r--r--
fileinput.html	40.37 KB	-rw-r--r--
filesys.html	16.78 KB	-rw-r--r--
fnmatch.html	21.02 KB	-rw-r--r--
fractions.html	35.29 KB	-rw-r--r--
frameworks.html	16.15 KB	-rw-r--r--
ftplib.html	71.97 KB	-rw-r--r--
functional.html	12.19 KB	-rw-r--r--
functions.html	260.33 KB	-rw-r--r--
functools.html	92.96 KB	-rw-r--r--
gc.html	40.97 KB	-rw-r--r--
getopt.html	29.4 KB	-rw-r--r--
getpass.html	16.01 KB	-rw-r--r--
gettext.html	98.02 KB	-rw-r--r--
glob.html	27.2 KB	-rw-r--r--
graphlib.html	34.82 KB	-rw-r--r--
grp.html	16.03 KB	-rw-r--r--
gzip.html	45.65 KB	-rw-r--r--
hashlib.html	93.19 KB	-rw-r--r--
heapq.html	42.43 KB	-rw-r--r--
hmac.html	24.74 KB	-rw-r--r--
html.entities.html	14.91 KB	-rw-r--r--
html.html	14.81 KB	-rw-r--r--
html.parser.html	47.7 KB	-rw-r--r--
http.client.html	85.63 KB	-rw-r--r--
http.cookiejar.html	113.94 KB	-rw-r--r--
http.cookies.html	47.64 KB	-rw-r--r--
http.html	45.52 KB	-rw-r--r--
http.server.html	73.05 KB	-rw-r--r--
i18n.html	13.44 KB	-rw-r--r--
idle.html	77.18 KB	-rw-r--r--
imaplib.html	87.08 KB	-rw-r--r--
imghdr.html	17.94 KB	-rw-r--r--
imp.html	54.32 KB	-rw-r--r--
importlib.html	239.96 KB	-rw-r--r--
importlib.metadata.html	43.14 KB	-rw-r--r--
index.html	75.06 KB	-rw-r--r--
inspect.html	168.74 KB	-rw-r--r--
internet.html	29.89 KB	-rw-r--r--
intro.html	13.81 KB	-rw-r--r--
io.html	154.15 KB	-rw-r--r--
ipaddress.html	137.75 KB	-rw-r--r--
ipc.html	12.6 KB	-rw-r--r--
itertools.html	153.27 KB	-rw-r--r--
json.html	98.9 KB	-rw-r--r--
keyword.html	14.88 KB	-rw-r--r--
language.html	16.71 KB	-rw-r--r--
linecache.html	18.09 KB	-rw-r--r--
locale.html	77.35 KB	-rw-r--r--
logging.config.html	100.3 KB	-rw-r--r--
logging.handlers.html	146.28 KB	-rw-r--r--
logging.html	169.67 KB	-rw-r--r--
lzma.html	66.89 KB	-rw-r--r--
mailbox.html	176.34 KB	-rw-r--r--
mailcap.html	20.86 KB	-rw-r--r--
markup.html	22.31 KB	-rw-r--r--
marshal.html	24.43 KB	-rw-r--r--
math.html	85.82 KB	-rw-r--r--
mimetypes.html	40.27 KB	-rw-r--r--
mm.html	11.16 KB	-rw-r--r--
mmap.html	55.53 KB	-rw-r--r--
modulefinder.html	23.67 KB	-rw-r--r--
modules.html	15.88 KB	-rw-r--r--
msilib.html	78.38 KB	-rw-r--r--
msvcrt.html	29.22 KB	-rw-r--r--
multiprocessing.html	405.24 KB	-rw-r--r--
multiprocessing.shared_memory....	60 KB	-rw-r--r--
netdata.html	20.24 KB	-rw-r--r--
netrc.html	20.39 KB	-rw-r--r--
nis.html	16.76 KB	-rw-r--r--
nntplib.html	84.93 KB	-rw-r--r--
numbers.html	45.67 KB	-rw-r--r--
numeric.html	19.29 KB	-rw-r--r--
operator.html	107.32 KB	-rw-r--r--
optparse.html	256.96 KB	-rw-r--r--
os.html	594.39 KB	-rw-r--r--
os.path.html	65.54 KB	-rw-r--r--
ossaudiodev.html	56.35 KB	-rw-r--r--
pathlib.html	170.01 KB	-rw-r--r--
pdb.html	68.67 KB	-rw-r--r--
persistence.html	19.13 KB	-rw-r--r--
pickle.html	154.45 KB	-rw-r--r--
pickletools.html	22.92 KB	-rw-r--r--
pipes.html	21.7 KB	-rw-r--r--
pkgutil.html	42.76 KB	-rw-r--r--
platform.html	45.08 KB	-rw-r--r--
plistlib.html	30.06 KB	-rw-r--r--
poplib.html	41.42 KB	-rw-r--r--
posix.html	20.96 KB	-rw-r--r--
pprint.html	55.35 KB	-rw-r--r--
profile.html	84.63 KB	-rw-r--r--
pty.html	23.7 KB	-rw-r--r--
pwd.html	16.84 KB	-rw-r--r--
py_compile.html	29 KB	-rw-r--r--
pyclbr.html	24.06 KB	-rw-r--r--
pydoc.html	19.59 KB	-rw-r--r--
pyexpat.html	104.38 KB	-rw-r--r--
python.html	22.46 KB	-rw-r--r--
queue.html	43.39 KB	-rw-r--r--
quopri.html	18.64 KB	-rw-r--r--
random.html	86.31 KB	-rw-r--r--
re.html	214.24 KB	-rw-r--r--
readline.html	50.19 KB	-rw-r--r--
reprlib.html	30.85 KB	-rw-r--r--
resource.html	48.26 KB	-rw-r--r--
rlcompleter.html	18.06 KB	-rw-r--r--
runpy.html	30.99 KB	-rw-r--r--
sched.html	27.04 KB	-rw-r--r--
secrets.html	30.2 KB	-rw-r--r--
security_warnings.html	16.21 KB	-rw-r--r--
select.html	74.58 KB	-rw-r--r--
selectors.html	41.91 KB	-rw-r--r--
shelve.html	36.54 KB	-rw-r--r--
shlex.html	61.03 KB	-rw-r--r--
shutil.html	100.13 KB	-rw-r--r--
signal.html	95.39 KB	-rw-r--r--
site.html	38.16 KB	-rw-r--r--
smtpd.html	44.09 KB	-rw-r--r--
smtplib.html	81.4 KB	-rw-r--r--
sndhdr.html	16.4 KB	-rw-r--r--
socket.html	256.95 KB	-rw-r--r--
socketserver.html	91.95 KB	-rw-r--r--
spwd.html	16.71 KB	-rw-r--r--
sqlite3.html	225.51 KB	-rw-r--r--
ssl.html	328.83 KB	-rw-r--r--
stat.html	57.79 KB	-rw-r--r--
statistics.html	123.22 KB	-rw-r--r--
stdtypes.html	615.43 KB	-rw-r--r--
string.html	108.03 KB	-rw-r--r--
stringprep.html	24.94 KB	-rw-r--r--
struct.html	70.58 KB	-rw-r--r--
subprocess.html	199.03 KB	-rw-r--r--
sunau.html	39.84 KB	-rw-r--r--
superseded.html	26.21 KB	-rw-r--r--
symtable.html	33.26 KB	-rw-r--r--
sys.html	198.83 KB	-rw-r--r--
sysconfig.html	39.81 KB	-rw-r--r--
syslog.html	27.36 KB	-rw-r--r--
tabnanny.html	16.18 KB	-rw-r--r--
tarfile.html	161.92 KB	-rw-r--r--
telnetlib.html	38.21 KB	-rw-r--r--
tempfile.html	58.39 KB	-rw-r--r--
termios.html	22.86 KB	-rw-r--r--
test.html	222.85 KB	-rw-r--r--
text.html	16.8 KB	-rw-r--r--
textwrap.html	48.83 KB	-rw-r--r--
threading.html	128.33 KB	-rw-r--r--
time.html	107.46 KB	-rw-r--r--
timeit.html	52.63 KB	-rw-r--r--
tk.html	28.08 KB	-rw-r--r--
tkinter.colorchooser.html	14.49 KB	-rw-r--r--
tkinter.dnd.html	17.09 KB	-rw-r--r--
tkinter.font.html	22.21 KB	-rw-r--r--
tkinter.html	106.85 KB	-rw-r--r--
tkinter.messagebox.html	20.09 KB	-rw-r--r--
tkinter.scrolledtext.html	14.52 KB	-rw-r--r--
tkinter.tix.html	59.69 KB	-rw-r--r--
tkinter.ttk.html	138.37 KB	-rw-r--r--
token.html	45.73 KB	-rw-r--r--
tokenize.html	39.86 KB	-rw-r--r--
trace.html	38.85 KB	-rw-r--r--
traceback.html	75.61 KB	-rw-r--r--
tracemalloc.html	122.33 KB	-rw-r--r--
tty.html	14.46 KB	-rw-r--r--
turtle.html	271.71 KB	-rw-r--r--
types.html	64.85 KB	-rw-r--r--
typing.html	315.69 KB	-rw-r--r--
unicodedata.html	27.3 KB	-rw-r--r--
unittest.html	310.01 KB	-rw-r--r--
unittest.mock-examples.html	177.75 KB	-rw-r--r--
unittest.mock.html	363.51 KB	-rw-r--r--
unix.html	13.46 KB	-rw-r--r--
urllib.error.html	18.56 KB	-rw-r--r--
urllib.html	12.92 KB	-rw-r--r--
urllib.parse.html	104.65 KB	-rw-r--r--
urllib.request.html	208.87 KB	-rw-r--r--
urllib.robotparser.html	22.63 KB	-rw-r--r--
uu.html	18.2 KB	-rw-r--r--
uuid.html	42.88 KB	-rw-r--r--
venv.html	90.43 KB	-rw-r--r--
warnings.html	69.13 KB	-rw-r--r--
wave.html	36.12 KB	-rw-r--r--
weakref.html	73.36 KB	-rw-r--r--
webbrowser.html	33.98 KB	-rw-r--r--
windows.html	12.32 KB	-rw-r--r--
winreg.html	89.48 KB	-rw-r--r--
winsound.html	26.3 KB	-rw-r--r--
wsgiref.html	111.52 KB	-rw-r--r--
xdrlib.html	42.07 KB	-rw-r--r--
xml.dom.html	114.66 KB	-rw-r--r--
xml.dom.minidom.html	49.6 KB	-rw-r--r--
xml.dom.pulldom.html	30.06 KB	-rw-r--r--
xml.etree.elementtree.html	186.49 KB	-rw-r--r--
xml.html	22.34 KB	-rw-r--r--
xml.sax.handler.html	55.78 KB	-rw-r--r--
xml.sax.html	31.74 KB	-rw-r--r--
xml.sax.reader.html	56.23 KB	-rw-r--r--
xml.sax.utils.html	22.28 KB	-rw-r--r--
xmlrpc.client.html	79.73 KB	-rw-r--r--
xmlrpc.html	11.9 KB	-rw-r--r--
xmlrpc.server.html	63.56 KB	-rw-r--r--
zipapp.html	52.45 KB	-rw-r--r--
zipfile.html	116.59 KB	-rw-r--r--
zipimport.html	33.76 KB	-rw-r--r--
zlib.html	42.29 KB	-rw-r--r--
zoneinfo.html	57.25 KB	-rw-r--r--

Code Editor : faulthandler.html

<!DOCTYPE html>

<title>faulthandler — Dump the Python traceback &#8212; Python 3.10.12 documentation</title><meta name="viewport" content="width=device-width, initial-scale=1.0">
    
    <link rel="stylesheet" type="text/css" href="../_static/pygments.css" />
    <link rel="stylesheet" type="text/css" href="../_static/pydoctheme.css?2022.1" />
    
    <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script>
    <script src="../_static/jquery.js"></script>
    <script src="../_static/underscore.js"></script>
    <script src="../_static/doctools.js"></script>
    
    <script src="../_static/sidebar.js"></script>
    
    <link rel="search" type="application/opensearchdescription+xml"
          title="Search within Python 3.10.12 documentation"
          href="../_static/opensearch.xml"/>
    <link rel="author" title="About these documents" href="../about.html" />
    <link rel="index" title="Index" href="../genindex.html" />
    <link rel="search" title="Search" href="../search.html" />
    <link rel="copyright" title="Copyright" href="../copyright.html" />
    <link rel="next" title="pdb — The Python Debugger" href="pdb.html" />
    <link rel="prev" title="bdb — Debugger framework" href="bdb.html" />
    <link rel="canonical" href="file:///usr/share/doc/python3.10/html/library/faulthandler.html" />

</head>
<body>
<div class="mobile-nav">
    <input type="checkbox" id="menuToggler" class="toggler__input" aria-controls="navigation"
           aria-pressed="false" aria-expanded="false" role="button" aria-label="Menu" />
    <label for="menuToggler" class="toggler__label">
        <span></span>
    </label>
    <nav class="nav-content" role="navigation">
         <a href="https://www.python.org/" class="nav-logo">
             <img src="../_static/py.svg" alt="Logo"/>
         </a>
        <div class="version_switcher_placeholder"></div>
        <form role="search" class="search" action="../search.html" method="get">
            <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" class="search-icon">
                <path fill-rule="nonzero"
                        d="M15.5 14h-.79l-.28-.27a6.5 6.5 0 001.48-5.34c-.47-2.78-2.79-5-5.59-5.34a6.505 6.505 0 00-7.27 7.27c.34 2.8 2.56 5.12 5.34 5.59a6.5 6.5 0 005.34-1.48l.27.28v.79l4.25 4.25c.41.41 1.08.41 1.49 0 .41-.41.41-1.08 0-1.49L15.5 14zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z" fill="#444"></path>
            </svg>
            <input type="text" name="q" aria-label="Quick search"/>
            <input type="submit" value="Go"/>
        </form>
    </nav>
    <div class="menu-wrapper">
        <nav class="menu" role="navigation" aria-label="main navigation">
            <div class="language_switcher_placeholder"></div>
  <h3><a href="../contents.html">Table of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">faulthandler</span></code> — Dump the Python traceback</a><ul>
<li><a class="reference internal" href="#dumping-the-traceback">Dumping the traceback</a></li>
<li><a class="reference internal" href="#fault-handler-state">Fault handler state</a></li>
<li><a class="reference internal" href="#dumping-the-tracebacks-after-a-timeout">Dumping the tracebacks after a timeout</a></li>
<li><a class="reference internal" href="#dumping-the-traceback-on-a-user-signal">Dumping the traceback on a user signal</a></li>
<li><a class="reference internal" href="#issue-with-file-descriptors">Issue with file descriptors</a></li>
<li><a class="reference internal" href="#example">Example</a></li>
</ul>
</li>
</ul>

<div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             accesskey="I">index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="pdb.html" title="pdb — The Python Debugger"
             accesskey="N">next</a> |</li>
        <li class="right" >
          <a href="bdb.html" title="bdb — Debugger framework"
             accesskey="P">previous</a> |</li>

<li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; margin-top: -1px"/></li>
          <li><a href="https://www.python.org/">Python</a> &#187;</li>
          <li class="switchers">
            <div class="language_switcher_placeholder"></div>
            <div class="version_switcher_placeholder"></div>
          </li>
          <li>
              
          </li>
    <li id="cpython-language-and-version">
      <a href="../index.html">3.10.12 Documentation</a> &#187;
    </li>

<li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="debug.html" accesskey="U">Debugging and Profiling</a> &#187;</li>
        <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">faulthandler</span></code> — Dump the Python traceback</a></li>
                <li class="right">

<div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body" role="main">
            
  <section id="module-faulthandler">
<span id="faulthandler-dump-the-python-traceback"></span><h1><a class="reference internal" href="#module-faulthandler" title="faulthandler: Dump the Python traceback."><code class="xref py py-mod docutils literal notranslate"><span class="pre">faulthandler</span></code></a> — Dump the Python traceback<a class="headerlink" href="#module-faulthandler" title="Permalink to this headline">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.3.</span></p>
</div>
<hr class="docutils" />
<p>This module contains functions to dump Python tracebacks explicitly, on a fault,
after a timeout, or on a user signal. Call <a class="reference internal" href="#faulthandler.enable" title="faulthandler.enable"><code class="xref py py-func docutils literal notranslate"><span class="pre">faulthandler.enable()</span></code></a> to
install fault handlers for the <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGSEGV</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGFPE</span></code>,
<code class="xref py py-const docutils literal notranslate"><span class="pre">SIGABRT</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGBUS</span></code>, and <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGILL</span></code> signals. You can also
enable them at startup by setting the <span class="target" id="index-0"></span><a class="reference internal" href="../using/cmdline.html#envvar-PYTHONFAULTHANDLER"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONFAULTHANDLER</span></code></a> environment
variable or by using the <a class="reference internal" href="../using/cmdline.html#cmdoption-X"><code class="xref std std-option docutils literal notranslate"><span class="pre">-X</span></code></a> <code class="docutils literal notranslate"><span class="pre">faulthandler</span></code> command line option.</p>
<p>The fault handler is compatible with system fault handlers like Apport or the
Windows fault handler. The module uses an alternative stack for signal handlers
if the <code class="xref c c-func docutils literal notranslate"><span class="pre">sigaltstack()</span></code> function is available. This allows it to dump the
traceback even on a stack overflow.</p>
<p>The fault handler is called on catastrophic cases and therefore can only use
signal-safe functions (e.g. it cannot allocate memory on the heap). Because of
this limitation traceback dumping is minimal compared to normal Python
tracebacks:</p>
<ul class="simple">
<li><p>Only ASCII is supported. The <code class="docutils literal notranslate"><span class="pre">backslashreplace</span></code> error handler is used on
encoding.</p></li>
<li><p>Each string is limited to 500 characters.</p></li>
<li><p>Only the filename, the function name and the line number are
displayed. (no source code)</p></li>
<li><p>It is limited to 100 frames and 100 threads.</p></li>
<li><p>The order is reversed: the most recent call is shown first.</p></li>
</ul>
<p>By default, the Python traceback is written to <a class="reference internal" href="sys.html#sys.stderr" title="sys.stderr"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.stderr</span></code></a>. To see
tracebacks, applications must be run in the terminal. A log file can
alternatively be passed to <a class="reference internal" href="#faulthandler.enable" title="faulthandler.enable"><code class="xref py py-func docutils literal notranslate"><span class="pre">faulthandler.enable()</span></code></a>.</p>
<p>The module is implemented in C, so tracebacks can be dumped on a crash or when
Python is deadlocked.</p>
<p>The <a class="reference internal" href="devmode.html#devmode"><span class="std std-ref">Python Development Mode</span></a> calls <a class="reference internal" href="#faulthandler.enable" title="faulthandler.enable"><code class="xref py py-func docutils literal notranslate"><span class="pre">faulthandler.enable()</span></code></a>
at Python startup.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<dl class="simple">
<dt>Module <a class="reference internal" href="pdb.html#module-pdb" title="pdb: The Python debugger for interactive interpreters."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pdb</span></code></a></dt><dd><p>Interactive source code debugger for Python programs.</p>
</dd>
<dt>Module <a class="reference internal" href="traceback.html#module-traceback" title="traceback: Print or retrieve a stack traceback."><code class="xref py py-mod docutils literal notranslate"><span class="pre">traceback</span></code></a></dt><dd><p>Standard interface to extract, format and print stack traces of Python programs.</p>
</dd>
</dl>
</div>
<section id="dumping-the-traceback">
<h2>Dumping the traceback<a class="headerlink" href="#dumping-the-traceback" title="Permalink to this headline">¶</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.dump_traceback">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">dump_traceback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">file</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">sys.stderr</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">all_threads</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.dump_traceback" title="Permalink to this definition">¶</a></dt>
<dd><p>Dump the tracebacks of all threads into <em>file</em>. If <em>all_threads</em> is
<code class="docutils literal notranslate"><span class="pre">False</span></code>, dump only the current thread.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p><a class="reference internal" href="traceback.html#traceback.print_tb" title="traceback.print_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">traceback.print_tb()</span></code></a>, which can be used to print a traceback object.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Added support for passing file descriptor to this function.</p>
</div>
</dd></dl>

</section>
<section id="fault-handler-state">
<h2>Fault handler state<a class="headerlink" href="#fault-handler-state" title="Permalink to this headline">¶</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.enable">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">enable</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">file</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">sys.stderr</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">all_threads</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.enable" title="Permalink to this definition">¶</a></dt>
<dd><p>Enable the fault handler: install handlers for the <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGSEGV</span></code>,
<code class="xref py py-const docutils literal notranslate"><span class="pre">SIGFPE</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGABRT</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGBUS</span></code> and <code class="xref py py-const docutils literal notranslate"><span class="pre">SIGILL</span></code>
signals to dump the Python traceback. If <em>all_threads</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code>,
produce tracebacks for every running thread. Otherwise, dump only the current
thread.</p>
<p>The <em>file</em> must be kept open until the fault handler is disabled: see
<a class="reference internal" href="#faulthandler-fd"><span class="std std-ref">issue with file descriptors</span></a>.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Added support for passing file descriptor to this function.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>On Windows, a handler for Windows exception is also installed.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.10: </span>The dump now mentions if a garbage collector collection is running
if <em>all_threads</em> is true.</p>
</div>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.disable">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">disable</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.disable" title="Permalink to this definition">¶</a></dt>
<dd><p>Disable the fault handler: uninstall the signal handlers installed by
<a class="reference internal" href="#faulthandler.enable" title="faulthandler.enable"><code class="xref py py-func docutils literal notranslate"><span class="pre">enable()</span></code></a>.</p>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.is_enabled">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">is_enabled</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.is_enabled" title="Permalink to this definition">¶</a></dt>
<dd><p>Check if the fault handler is enabled.</p>
</dd></dl>

</section>
<section id="dumping-the-tracebacks-after-a-timeout">
<h2>Dumping the tracebacks after a timeout<a class="headerlink" href="#dumping-the-tracebacks-after-a-timeout" title="Permalink to this headline">¶</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.dump_traceback_later">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">dump_traceback_later</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">timeout</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">repeat</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">file</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">sys.stderr</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">exit</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.dump_traceback_later" title="Permalink to this definition">¶</a></dt>
<dd><p>Dump the tracebacks of all threads, after a timeout of <em>timeout</em> seconds, or
every <em>timeout</em> seconds if <em>repeat</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code>.  If <em>exit</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code>, call
<code class="xref c c-func docutils literal notranslate"><span class="pre">_exit()</span></code> with status=1 after dumping the tracebacks.  (Note
<code class="xref c c-func docutils literal notranslate"><span class="pre">_exit()</span></code> exits the process immediately, which means it doesn’t do any
cleanup like flushing file buffers.) If the function is called twice, the new
call replaces previous parameters and resets the timeout. The timer has a
sub-second resolution.</p>
<p>The <em>file</em> must be kept open until the traceback is dumped or
<a class="reference internal" href="#faulthandler.cancel_dump_traceback_later" title="faulthandler.cancel_dump_traceback_later"><code class="xref py py-func docutils literal notranslate"><span class="pre">cancel_dump_traceback_later()</span></code></a> is called: see <a class="reference internal" href="#faulthandler-fd"><span class="std std-ref">issue with file
descriptors</span></a>.</p>
<p>This function is implemented using a watchdog thread.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>This function is now always available.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Added support for passing file descriptor to this function.</p>
</div>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.cancel_dump_traceback_later">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">cancel_dump_traceback_later</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.cancel_dump_traceback_later" title="Permalink to this definition">¶</a></dt>
<dd><p>Cancel the last call to <a class="reference internal" href="#faulthandler.dump_traceback_later" title="faulthandler.dump_traceback_later"><code class="xref py py-func docutils literal notranslate"><span class="pre">dump_traceback_later()</span></code></a>.</p>
</dd></dl>

</section>
<section id="dumping-the-traceback-on-a-user-signal">
<h2>Dumping the traceback on a user signal<a class="headerlink" href="#dumping-the-traceback-on-a-user-signal" title="Permalink to this headline">¶</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.register">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">register</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">signum</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">file</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">sys.stderr</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">all_threads</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">chain</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.register" title="Permalink to this definition">¶</a></dt>
<dd><p>Register a user signal: install a handler for the <em>signum</em> signal to dump
the traceback of all threads, or of the current thread if <em>all_threads</em> is
<code class="docutils literal notranslate"><span class="pre">False</span></code>, into <em>file</em>. Call the previous handler if chain is <code class="docutils literal notranslate"><span class="pre">True</span></code>.</p>
<p>The <em>file</em> must be kept open until the signal is unregistered by
<a class="reference internal" href="#faulthandler.unregister" title="faulthandler.unregister"><code class="xref py py-func docutils literal notranslate"><span class="pre">unregister()</span></code></a>: see <a class="reference internal" href="#faulthandler-fd"><span class="std std-ref">issue with file descriptors</span></a>.</p>
<p>Not available on Windows.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Added support for passing file descriptor to this function.</p>
</div>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="faulthandler.unregister">
<span class="sig-prename descclassname"><span class="pre">faulthandler.</span></span><span class="sig-name descname"><span class="pre">unregister</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">signum</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#faulthandler.unregister" title="Permalink to this definition">¶</a></dt>
<dd><p>Unregister a user signal: uninstall the handler of the <em>signum</em> signal
installed by <a class="reference internal" href="#faulthandler.register" title="faulthandler.register"><code class="xref py py-func docutils literal notranslate"><span class="pre">register()</span></code></a>. Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the signal was registered,
<code class="docutils literal notranslate"><span class="pre">False</span></code> otherwise.</p>
<p>Not available on Windows.</p>
</dd></dl>

</section>
<section id="issue-with-file-descriptors">
<span id="faulthandler-fd"></span><h2>Issue with file descriptors<a class="headerlink" href="#issue-with-file-descriptors" title="Permalink to this headline">¶</a></h2>
<p><a class="reference internal" href="#faulthandler.enable" title="faulthandler.enable"><code class="xref py py-func docutils literal notranslate"><span class="pre">enable()</span></code></a>, <a class="reference internal" href="#faulthandler.dump_traceback_later" title="faulthandler.dump_traceback_later"><code class="xref py py-func docutils literal notranslate"><span class="pre">dump_traceback_later()</span></code></a> and <a class="reference internal" href="#faulthandler.register" title="faulthandler.register"><code class="xref py py-func docutils literal notranslate"><span class="pre">register()</span></code></a> keep the
file descriptor of their <em>file</em> argument. If the file is closed and its file
descriptor is reused by a new file, or if <a class="reference internal" href="os.html#os.dup2" title="os.dup2"><code class="xref py py-func docutils literal notranslate"><span class="pre">os.dup2()</span></code></a> is used to replace
the file descriptor, the traceback will be written into a different file. Call
these functions again each time that the file is replaced.</p>
</section>
<section id="example">
<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
<p>Example of a segmentation fault on Linux with and without enabling the fault
handler:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>python3 -c <span class="s2">&quot;import ctypes; ctypes.string_at(0)&quot;</span>
<span class="go">Segmentation fault</span>

<span class="gp">$ </span>python3 -q -X faulthandler
<span class="go">&gt;&gt;&gt; import ctypes</span>
<span class="go">&gt;&gt;&gt; ctypes.string_at(0)</span>
<span class="go">Fatal Python error: Segmentation fault</span>

<span class="go">Current thread 0x00007fb899f39700 (most recent call first):</span>
<span class="go">  File &quot;/home/python/cpython/Lib/ctypes/__init__.py&quot;, line 486 in string_at</span>
<span class="go">  File &quot;&lt;stdin&gt;&quot;, line 1 in &lt;module&gt;</span>
<span class="go">Segmentation fault</span>
</pre></div>
</div>
</section>
</section>

<div class="clearer"></div>
          </div>
        </div>
      </div>
      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
        <div class="sphinxsidebarwrapper">
  <h3><a href="../contents.html">Table of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">faulthandler</span></code> — Dump the Python traceback</a><ul>
<li><a class="reference internal" href="#dumping-the-traceback">Dumping the traceback</a></li>
<li><a class="reference internal" href="#fault-handler-state">Fault handler state</a></li>
<li><a class="reference internal" href="#dumping-the-tracebacks-after-a-timeout">Dumping the tracebacks after a timeout</a></li>
<li><a class="reference internal" href="#dumping-the-traceback-on-a-user-signal">Dumping the traceback on a user signal</a></li>
<li><a class="reference internal" href="#issue-with-file-descriptors">Issue with file descriptors</a></li>
<li><a class="reference internal" href="#example">Example</a></li>
</ul>
</li>
</ul>

<h4>Previous topic</h4>
  <p class="topless"><a href="bdb.html"
                        title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">bdb</span></code> — Debugger framework</a></p>
  <h4>Next topic</h4>
  <p class="topless"><a href="pdb.html"
                        title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">pdb</span></code> — The Python Debugger</a></p>
  <div role="note" aria-label="source link">
    <h3>This Page</h3>
    <ul class="this-page-menu">
      <li><a href="../bugs.html">Report a Bug</a></li>
      <li>
        <a href="https://github.com/python/cpython/blob/3.10/Doc/library/faulthandler.rst"
            rel="nofollow">Show Source
        </a>
      </li>
    </ul>
  </div>
        </div>
      </div>
      <div class="clearer"></div>
    </div>  
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             >index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="pdb.html" title="pdb — The Python Debugger"
             >next</a> |</li>
        <li class="right" >
          <a href="bdb.html" title="bdb — Debugger framework"
             >previous</a> |</li>

<li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="debug.html" >Debugging and Profiling</a> &#187;</li>
        <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">faulthandler</span></code> — Dump the Python traceback</a></li>
                <li class="right">

<div class="inline-search" role="search">
        <form class="inline-search" action="../search.html" method="get">
          <input placeholder="Quick search" aria-label="Quick search" type="text" name="q" />
          <input type="submit" value="Go" />
          <input type="hidden" name="check_keywords" value="yes" />
          <input type="hidden" name="area" value="default" />
        </form>
    </div>
                     |
                </li>
            
      </ul>
    </div>  
    <div class="footer">
    &copy; <a href="../copyright.html">Copyright</a> 2001-2026, Python Software Foundation.
    <br />
    This page is licensed under the Python Software Foundation License Version 2.
    <br />
    Examples, recipes, and other code in the documentation are additionally licensed under the Zero Clause BSD License.
    <br />
    See <a href="/license.html">History and License</a> for more information.<br />
    <br />

The Python Software Foundation is a non-profit corporation.
<a href="https://www.python.org/psf/donations/">Please donate.</a>
<br />
    <br />

Last updated on January 26, 2026.
    <a href="/bugs.html">Found a bug</a>?
    <br />

Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.3.2.
    </div>

</body>
</html>

${this.title}

Code Editor : faulthandler.html