static void
faulthandler_dump_traceback(int fd, int all_threads,
PyInterpreterState *interp)
{
static volatile int reentrant = 0;
PyThreadState *tstate;
if (reentrant)
return;
reentrant = 1;
#ifdef WITH_THREAD
/* SIGSEGV, SIGFPE, SIGABRT, SIGBUS and SIGILL are synchronous signals and
are thus delivered to the thread that caused the fault. Get the Python
thread state of the current thread.
PyThreadState_Get() doesn't give the state of the thread that caused the
fault if the thread released the GIL, and so this function cannot be
used. Read the thread local storage (TLS) instead: call
PyGILState_GetThisThreadState(). */
tstate = PyGILState_GetThisThreadState();
#else
tstate = PyThreadState_Get();
#endif
if (all_threads)
_Py_DumpTracebackThreads(fd, interp, tstate);
else {
if (tstate != NULL)
_Py_DumpTraceback(fd, tstate);
}
reentrant = 0;
}
static void
faulthandler_user(int signum)
{
user_signal_t *user;
PyThreadState *tstate;
int save_errno = errno;
user = &user_signals[signum];
if (!user->enabled)
return;
#ifdef WITH_THREAD
/* PyThreadState_Get() doesn't give the state of the current thread if
the thread doesn't hold the GIL. Read the thread local storage (TLS)
instead: call PyGILState_GetThisThreadState(). */
tstate = PyGILState_GetThisThreadState();
#else
tstate = PyThreadState_Get();
#endif
if (user->all_threads)
_Py_DumpTracebackThreads(user->fd, user->interp, tstate);
else {
if (tstate != NULL)
_Py_DumpTraceback(user->fd, tstate);
}
#ifdef HAVE_SIGACTION
if (user->chain) {
(void)sigaction(signum, &user->previous, NULL);
errno = save_errno;
/* call the previous signal handler */
raise(signum);
save_errno = errno;
(void)faulthandler_register(signum, user->chain, NULL);
errno = save_errno;
}
#else
if (user->chain) {
errno = save_errno;
/* call the previous signal handler */
user->previous(signum);
}
#endif
}
static PyObject*
faulthandler_dump_traceback_py(PyObject *self,
PyObject *args, PyObject *kwargs)
{
static char *kwlist[] = {"file", "all_threads", NULL};
PyObject *file = NULL;
int all_threads = 1;
PyThreadState *tstate;
const char *errmsg;
int fd;
if (!PyArg_ParseTupleAndKeywords(args, kwargs,
"|Oi:dump_traceback", kwlist,
&file, &all_threads))
return NULL;
fd = faulthandler_get_fileno(&file);
if (fd < 0)
return NULL;
tstate = get_thread_state();
if (tstate == NULL)
return NULL;
if (all_threads) {
errmsg = _Py_DumpTracebackThreads(fd, NULL, tstate);
if (errmsg != NULL) {
PyErr_SetString(PyExc_RuntimeError, errmsg);
return NULL;
}
}
else {
_Py_DumpTraceback(fd, tstate);
}
if (PyErr_CheckSignals())
return NULL;
Py_RETURN_NONE;
}
static PyObject*
faulthandler_dump_traceback_py(PyObject *self,
PyObject *args, PyObject *kwargs)
{
static char *kwlist[] = {"file", "all_threads", NULL};
PyObject *file = NULL;
int all_threads = 0;
PyThreadState *tstate;
const char *errmsg;
int fd;
if (!PyArg_ParseTupleAndKeywords(args, kwargs,
"|Oi:dump_traceback", kwlist,
&file, &all_threads))
return NULL;
file = faulthandler_get_fileno(file, &fd);
if (file == NULL)
return NULL;
/* The caller holds the GIL and so PyThreadState_Get() can be used */
tstate = PyThreadState_Get();
if (tstate == NULL) {
PyErr_SetString(PyExc_RuntimeError,
"unable to get the current thread state");
return NULL;
}
if (all_threads) {
errmsg = _Py_DumpTracebackThreads(fd, tstate->interp, tstate);
if (errmsg != NULL) {
PyErr_SetString(PyExc_RuntimeError, errmsg);
return NULL;
}
}
else {
_Py_DumpTraceback(fd, tstate);
}
Py_RETURN_NONE;
}
static void
faulthandler_user(int signum)
{
user_signal_t *user;
PyThreadState *tstate;
user = &user_signals[signum];
if (!user->enabled)
return;
/* PyThreadState_Get() doesn't give the state of the current thread if
the thread doesn't hold the GIL. Read the thread local storage (TLS)
instead: call PyGILState_GetThisThreadState(). */
tstate = PyGILState_GetThisThreadState();
if (user->all_threads)
_Py_DumpTracebackThreads(user->fd, user->interp, tstate);
else {
if (tstate == NULL)
return;
_Py_DumpTraceback(user->fd, tstate);
}
}
static void
faulthandler_fatal_error(int signum)
{
const int fd = fatal_error.fd;
unsigned int i;
fault_handler_t *handler = NULL;
PyThreadState *tstate;
int save_errno = errno;
if (!fatal_error.enabled)
return;
for (i=0; i < faulthandler_nsignals; i++) {
handler = &faulthandler_handlers[i];
if (handler->signum == signum)
break;
}
if (handler == NULL) {
/* faulthandler_nsignals == 0 (unlikely) */
return;
}
/* restore the previous handler */
#ifdef HAVE_SIGACTION
(void)sigaction(signum, &handler->previous, NULL);
#else
(void)signal(signum, handler->previous);
#endif
handler->enabled = 0;
PUTS(fd, "Fatal Python error: ");
PUTS(fd, handler->name);
PUTS(fd, "\n\n");
#ifdef WITH_THREAD
/* SIGSEGV, SIGFPE, SIGABRT, SIGBUS and SIGILL are synchronous signals and
are thus delivered to the thread that caused the fault. Get the Python
thread state of the current thread.
PyThreadState_Get() doesn't give the state of the thread that caused the
fault if the thread released the GIL, and so this function cannot be
used. Read the thread local storage (TLS) instead: call
PyGILState_GetThisThreadState(). */
tstate = PyGILState_GetThisThreadState();
#else
tstate = PyThreadState_Get();
#endif
if (fatal_error.all_threads)
_Py_DumpTracebackThreads(fd, fatal_error.interp, tstate);
else {
if (tstate != NULL)
_Py_DumpTraceback(fd, tstate);
}
errno = save_errno;
#ifdef MS_WINDOWS
if (signum == SIGSEGV) {
/* don't explicitly call the previous handler for SIGSEGV in this signal
handler, because the Windows signal handler would not be called */
return;
}
#endif
/* call the previous signal handler: it is called immediatly if we use
sigaction() thanks to SA_NODEFER flag, otherwise it is deferred */
raise(signum);
}