static void
faulthandler_user(int signum)
{
user_signal_t *user;
int save_errno = errno;
user = &user_signals[signum];
if (!user->enabled)
return;
faulthandler_dump_traceback(user->fd, user->all_threads, user->interp);
#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_register_py(PyObject *self,
PyObject *args, PyObject *kwargs)
{
static char *kwlist[] = {"signum", "file", "all_threads", "chain", NULL};
int signum;
PyObject *file = NULL;
int all_threads = 1;
int chain = 0;
int fd;
user_signal_t *user;
_Py_sighandler_t previous;
PyThreadState *tstate;
int err;
if (!PyArg_ParseTupleAndKeywords(args, kwargs,
"i|Oii:register", kwlist,
&signum, &file, &all_threads, &chain))
return NULL;
if (!check_signum(signum))
return NULL;
tstate = get_thread_state();
if (tstate == NULL)
return NULL;
file = faulthandler_get_fileno(file, &fd);
if (file == NULL)
return NULL;
if (user_signals == NULL) {
user_signals = PyMem_Malloc(NSIG * sizeof(user_signal_t));
if (user_signals == NULL)
return PyErr_NoMemory();
memset(user_signals, 0, NSIG * sizeof(user_signal_t));
}
user = &user_signals[signum];
if (!user->enabled) {
err = faulthandler_register(signum, chain, &previous);
if (err) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
user->previous = previous;
}
Py_XDECREF(user->file);
Py_INCREF(file);
user->file = file;
user->fd = fd;
user->all_threads = all_threads;
user->chain = chain;
user->interp = tstate->interp;
user->enabled = 1;
Py_RETURN_NONE;
}
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
}
