| |
| /* Signal module -- many thanks to Lance Ellinghaus */ |
| |
| /* XXX Signals should be recorded per thread, now we have thread state. */ |
| |
| #include "Python.h" |
| #include "intrcheck.h" |
| |
| #ifdef MS_WIN32 |
| #include <process.h> |
| #endif |
| |
| #include <signal.h> |
| |
| #ifndef SIG_ERR |
| #define SIG_ERR ((PyOS_sighandler_t)(-1)) |
| #endif |
| |
| #if defined(PYOS_OS2) && !defined(PYCC_GCC) |
| #define NSIG 12 |
| #include <process.h> |
| #endif |
| |
| #ifndef NSIG |
| # if defined(_NSIG) |
| # define NSIG _NSIG /* For BSD/SysV */ |
| # elif defined(_SIGMAX) |
| # define NSIG (_SIGMAX + 1) /* For QNX */ |
| # elif defined(SIGMAX) |
| # define NSIG (SIGMAX + 1) /* For djgpp */ |
| # else |
| # define NSIG 64 /* Use a reasonable default value */ |
| # endif |
| #endif |
| |
| |
| /* |
| NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS |
| |
| When threads are supported, we want the following semantics: |
| |
| - only the main thread can set a signal handler |
| - any thread can get a signal handler |
| - signals are only delivered to the main thread |
| |
| I.e. we don't support "synchronous signals" like SIGFPE (catching |
| this doesn't make much sense in Python anyway) nor do we support |
| signals as a means of inter-thread communication, since not all |
| thread implementations support that (at least our thread library |
| doesn't). |
| |
| We still have the problem that in some implementations signals |
| generated by the keyboard (e.g. SIGINT) are delivered to all |
| threads (e.g. SGI), while in others (e.g. Solaris) such signals are |
| delivered to one random thread (an intermediate possibility would |
| be to deliver it to the main thread -- POSIX?). For now, we have |
| a working implementation that works in all three cases -- the |
| handler ignores signals if getpid() isn't the same as in the main |
| thread. XXX This is a hack. |
| |
| GNU pth is a user-space threading library, and as such, all threads |
| run within the same process. In this case, if the currently running |
| thread is not the main_thread, send the signal to the main_thread. |
| */ |
| |
| #ifdef WITH_THREAD |
| #include <sys/types.h> /* For pid_t */ |
| #include "pythread.h" |
| static long main_thread; |
| static pid_t main_pid; |
| #endif |
| |
| static struct { |
| int tripped; |
| PyObject *func; |
| } Handlers[NSIG]; |
| |
| static int is_tripped = 0; /* Speed up sigcheck() when none tripped */ |
| |
| static PyObject *DefaultHandler; |
| static PyObject *IgnoreHandler; |
| static PyObject *IntHandler; |
| |
| /* On Solaris 8, gcc will produce a warning that the function |
| declaration is not a prototype. This is caused by the definition of |
| SIG_DFL as (void (*)())0; the correct declaration would have been |
| (void (*)(int))0. */ |
| |
| static PyOS_sighandler_t old_siginthandler = SIG_DFL; |
| |
| |
| static PyObject * |
| signal_default_int_handler(PyObject *self, PyObject *args) |
| { |
| PyErr_SetNone(PyExc_KeyboardInterrupt); |
| return NULL; |
| } |
| |
| static char default_int_handler_doc[] = |
| "default_int_handler(...)\n\ |
| \n\ |
| The default handler for SIGINT instated by Python.\n\ |
| It raises KeyboardInterrupt."; |
| |
| |
| static int |
| checksignals_witharg(void * unused) |
| { |
| return PyErr_CheckSignals(); |
| } |
| |
| static void |
| signal_handler(int sig_num) |
| { |
| #ifdef WITH_THREAD |
| #ifdef WITH_PTH |
| if (PyThread_get_thread_ident() != main_thread) { |
| pth_raise(*(pth_t *) main_thread, sig_num); |
| return; |
| } |
| #endif |
| /* See NOTES section above */ |
| if (getpid() == main_pid) { |
| #endif |
| is_tripped++; |
| Handlers[sig_num].tripped = 1; |
| Py_AddPendingCall(checksignals_witharg, NULL); |
| #ifdef WITH_THREAD |
| } |
| #endif |
| #ifdef SIGCHLD |
| if (sig_num == SIGCHLD) { |
| /* To avoid infinite recursion, this signal remains |
| reset until explicit re-instated. |
| Don't clear the 'func' field as it is our pointer |
| to the Python handler... */ |
| return; |
| } |
| #endif |
| #ifdef HAVE_SIGINTERRUPT |
| siginterrupt(sig_num, 1); |
| #endif |
| PyOS_setsig(sig_num, signal_handler); |
| } |
| |
| |
| #ifdef HAVE_ALARM |
| static PyObject * |
| signal_alarm(PyObject *self, PyObject *args) |
| { |
| int t; |
| if (!PyArg_ParseTuple(args, "i:alarm", &t)) |
| return NULL; |
| /* alarm() returns the number of seconds remaining */ |
| return PyInt_FromLong((long)alarm(t)); |
| } |
| |
| static char alarm_doc[] = |
| "alarm(seconds)\n\ |
| \n\ |
| Arrange for SIGALRM to arrive after the given number of seconds."; |
| #endif |
| |
| #ifdef HAVE_PAUSE |
| static PyObject * |
| signal_pause(PyObject *self) |
| { |
| Py_BEGIN_ALLOW_THREADS |
| (void)pause(); |
| Py_END_ALLOW_THREADS |
| /* make sure that any exceptions that got raised are propagated |
| * back into Python |
| */ |
| if (PyErr_CheckSignals()) |
| return NULL; |
| |
| Py_INCREF(Py_None); |
| return Py_None; |
| } |
| static char pause_doc[] = |
| "pause()\n\ |
| \n\ |
| Wait until a signal arrives."; |
| |
| #endif |
| |
| |
| static PyObject * |
| signal_signal(PyObject *self, PyObject *args) |
| { |
| PyObject *obj; |
| int sig_num; |
| PyObject *old_handler; |
| void (*func)(int); |
| if (!PyArg_ParseTuple(args, "iO:signal", &sig_num, &obj)) |
| return NULL; |
| #ifdef WITH_THREAD |
| if (PyThread_get_thread_ident() != main_thread) { |
| PyErr_SetString(PyExc_ValueError, |
| "signal only works in main thread"); |
| return NULL; |
| } |
| #endif |
| if (sig_num < 1 || sig_num >= NSIG) { |
| PyErr_SetString(PyExc_ValueError, |
| "signal number out of range"); |
| return NULL; |
| } |
| if (obj == IgnoreHandler) |
| func = SIG_IGN; |
| else if (obj == DefaultHandler) |
| func = SIG_DFL; |
| else if (!PyCallable_Check(obj)) { |
| PyErr_SetString(PyExc_TypeError, |
| "signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object"); |
| return NULL; |
| } |
| else |
| func = signal_handler; |
| #ifdef HAVE_SIGINTERRUPT |
| siginterrupt(sig_num, 1); |
| #endif |
| if (PyOS_setsig(sig_num, func) == SIG_ERR) { |
| PyErr_SetFromErrno(PyExc_RuntimeError); |
| return NULL; |
| } |
| old_handler = Handlers[sig_num].func; |
| Handlers[sig_num].tripped = 0; |
| Py_INCREF(obj); |
| Handlers[sig_num].func = obj; |
| return old_handler; |
| } |
| |
| static char signal_doc[] = |
| "signal(sig, action) -> action\n\ |
| \n\ |
| Set the action for the given signal. The action can be SIG_DFL,\n\ |
| SIG_IGN, or a callable Python object. The previous action is\n\ |
| returned. See getsignal() for possible return values.\n\ |
| \n\ |
| *** IMPORTANT NOTICE ***\n\ |
| A signal handler function is called with two arguments:\n\ |
| the first is the signal number, the second is the interrupted stack frame."; |
| |
| |
| static PyObject * |
| signal_getsignal(PyObject *self, PyObject *args) |
| { |
| int sig_num; |
| PyObject *old_handler; |
| if (!PyArg_ParseTuple(args, "i:getsignal", &sig_num)) |
| return NULL; |
| if (sig_num < 1 || sig_num >= NSIG) { |
| PyErr_SetString(PyExc_ValueError, |
| "signal number out of range"); |
| return NULL; |
| } |
| old_handler = Handlers[sig_num].func; |
| Py_INCREF(old_handler); |
| return old_handler; |
| } |
| |
| static char getsignal_doc[] = |
| "getsignal(sig) -> action\n\ |
| \n\ |
| Return the current action for the given signal. The return value can be:\n\ |
| SIG_IGN -- if the signal is being ignored\n\ |
| SIG_DFL -- if the default action for the signal is in effect\n\ |
| None -- if an unknown handler is in effect\n\ |
| anything else -- the callable Python object used as a handler\n\ |
| "; |
| |
| #ifdef HAVE_SIGPROCMASK /* we assume that having SIGPROCMASK is enough |
| to guarantee full POSIX signal handling */ |
| /* returns 0 for success, <0 for failure (with exception set) */ |
| static int |
| _signal_list_to_sigset(PyObject* seq, sigset_t* set, char* mesg) |
| { |
| int i, len, val; |
| |
| seq = PySequence_Fast(seq, mesg); |
| if (!seq) |
| return -1; |
| |
| len = PySequence_Fast_GET_SIZE(seq); |
| |
| sigemptyset(set); |
| |
| for (i = 0; i < len; i++) { |
| val = PyInt_AsLong(PySequence_Fast_GET_ITEM(seq, i)); |
| if (val == -1 && PyErr_Occurred()) { |
| Py_DECREF(seq); |
| return -1; |
| } |
| if (sigaddset(set, val) < 0) { |
| Py_DECREF(seq); |
| PyErr_SetFromErrno(PyExc_ValueError); |
| return -1; |
| } |
| } |
| |
| Py_DECREF(seq); |
| return 0; |
| } |
| |
| static PyObject* |
| _signal_sigset_to_list(sigset_t* set) |
| { |
| PyObject* ret; |
| PyObject* ob; |
| int i; |
| |
| ret = PyList_New(0); |
| if (!ret) |
| return NULL; |
| |
| for (i = 1; i < NSIG; i++) { |
| if (sigismember(set, i)) { |
| ob = PyInt_FromLong(i); |
| if (!ob) { |
| Py_DECREF(ret); |
| return NULL; |
| } |
| PyList_Append(ret, ob); |
| Py_DECREF(ob); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static PyObject* |
| signal_sigprocmask(PyObject* self, PyObject* args) |
| { |
| int how; |
| sigset_t newset, oldset; |
| PyObject* seq; |
| |
| if (!PyArg_ParseTuple(args, "iO", &how, &seq)) |
| return NULL; |
| |
| if (_signal_list_to_sigset(seq, &newset, |
| "sigprocmask requires a sequence") < 0) |
| return NULL; |
| |
| if (sigprocmask(how, &newset, &oldset) < 0) { |
| return PyErr_SetFromErrno(PyExc_ValueError); |
| } |
| |
| if (PyErr_CheckSignals()) |
| return NULL; |
| |
| return _signal_sigset_to_list(&oldset); |
| } |
| |
| static char sigprocmask_doc[] = |
| "sigprocmask(how, sigset) -> sigset\n\ |
| \n\ |
| Change the list of currently blocked signals. The parameter how should be\n\ |
| one of SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK and sigset should be a\n\ |
| sequence of signal numbers. The behaviour of the call depends on the value\n\ |
| of how:\n\ |
| \n\ |
| SIG_BLOCK\n\ |
| The set of blocked signals is the union of the current set and the\n\ |
| sigset argument.\n\ |
| SIG_UNBLOCK\n\ |
| The signals in sigset are removed from the current set of blocked\n\ |
| signals. It is legal to attempt to unblock a signal which is not\n\ |
| blocked.\n\ |
| SIG_SETMASK\n\ |
| The set of blocked signals is set to the argument set.\n\ |
| \n\ |
| A list contating the numbers of the previously blocked signals is returned."; |
| |
| static PyObject* |
| signal_sigpending(PyObject* self) |
| { |
| sigset_t set; |
| |
| if (sigpending(&set) < 0) { |
| return PyErr_SetFromErrno(PyExc_ValueError); |
| } |
| |
| return _signal_sigset_to_list(&set); |
| } |
| |
| static char sigpending_doc[] = |
| "sigpending() -> sigset\n\ |
| \n\ |
| Return the set of pending signals, i.e. a list containing the numbers of\n\ |
| those signals that have been raised while blocked."; |
| |
| static PyObject* |
| signal_sigsuspend(PyObject* self, PyObject* arg) |
| { |
| sigset_t set; |
| |
| if (_signal_list_to_sigset(arg, &set, |
| "sigsuspend requires a sequence") < 0) |
| return NULL; |
| |
| Py_BEGIN_ALLOW_THREADS |
| sigsuspend(&set); |
| Py_END_ALLOW_THREADS |
| |
| if (PyErr_CheckSignals()) |
| return NULL; |
| |
| Py_INCREF(Py_None); |
| return Py_None; |
| } |
| |
| static char sigsuspend_doc[] = |
| "sigsuspend(sigset) -> None\n\ |
| \n\ |
| Temporarily replace the signal mask with sigset (which should be a sequence\n\ |
| of signal numbers) and suspend the process until a signal is received."; |
| #endif |
| |
| /* List of functions defined in the module */ |
| static PyMethodDef signal_methods[] = { |
| #ifdef HAVE_ALARM |
| {"alarm", signal_alarm, METH_VARARGS, alarm_doc}, |
| #endif |
| {"signal", signal_signal, METH_VARARGS, signal_doc}, |
| {"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc}, |
| #ifdef HAVE_PAUSE |
| {"pause", (PyCFunction)signal_pause, |
| METH_NOARGS,pause_doc}, |
| #endif |
| {"default_int_handler", signal_default_int_handler, |
| METH_VARARGS, default_int_handler_doc}, |
| #ifdef HAVE_SIGPROCMASK |
| {"sigprocmask", (PyCFunction)signal_sigprocmask, |
| METH_VARARGS, sigprocmask_doc}, |
| {"sigpending", (PyCFunction)signal_sigpending, |
| METH_NOARGS, sigpending_doc}, |
| {"sigsuspend", (PyCFunction)signal_sigsuspend, |
| METH_O, sigsuspend_doc}, |
| #endif |
| {NULL, NULL} /* sentinel */ |
| }; |
| |
| |
| static char module_doc[] = |
| "This module provides mechanisms to use signal handlers in Python.\n\ |
| \n\ |
| Functions:\n\ |
| \n\ |
| alarm() -- cause SIGALRM after a specified time [Unix only]\n\ |
| signal() -- set the action for a given signal\n\ |
| getsignal() -- get the signal action for a given signal\n\ |
| pause() -- wait until a signal arrives [Unix only]\n\ |
| default_int_handler() -- default SIGINT handler\n\ |
| \n\ |
| sigpending() |\n\ |
| sigprocmask() |-- posix signal mask handling [Unix only]\n\ |
| sigsuspend() |\n\ |
| \n\ |
| Constants:\n\ |
| \n\ |
| SIG_DFL -- used to refer to the system default handler\n\ |
| SIG_IGN -- used to ignore the signal\n\ |
| NSIG -- number of defined signals\n\ |
| \n\ |
| SIGINT, SIGTERM, etc. -- signal numbers\n\ |
| \n\ |
| *** IMPORTANT NOTICE ***\n\ |
| A signal handler function is called with two arguments:\n\ |
| the first is the signal number, the second is the interrupted stack frame."; |
| |
| DL_EXPORT(void) |
| initsignal(void) |
| { |
| PyObject *m, *d, *x; |
| int i; |
| |
| #ifdef WITH_THREAD |
| main_thread = PyThread_get_thread_ident(); |
| main_pid = getpid(); |
| #endif |
| |
| /* Create the module and add the functions */ |
| m = Py_InitModule3("signal", signal_methods, module_doc); |
| |
| /* Add some symbolic constants to the module */ |
| d = PyModule_GetDict(m); |
| |
| x = DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL); |
| if (!x || PyDict_SetItemString(d, "SIG_DFL", x) < 0) |
| goto finally; |
| |
| x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN); |
| if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0) |
| goto finally; |
| |
| x = PyInt_FromLong((long)NSIG); |
| if (!x || PyDict_SetItemString(d, "NSIG", x) < 0) |
| goto finally; |
| Py_DECREF(x); |
| |
| x = IntHandler = PyDict_GetItemString(d, "default_int_handler"); |
| if (!x) |
| goto finally; |
| Py_INCREF(IntHandler); |
| |
| Handlers[0].tripped = 0; |
| for (i = 1; i < NSIG; i++) { |
| void (*t)(int); |
| t = PyOS_getsig(i); |
| Handlers[i].tripped = 0; |
| if (t == SIG_DFL) |
| Handlers[i].func = DefaultHandler; |
| else if (t == SIG_IGN) |
| Handlers[i].func = IgnoreHandler; |
| else |
| Handlers[i].func = Py_None; /* None of our business */ |
| Py_INCREF(Handlers[i].func); |
| } |
| if (Handlers[SIGINT].func == DefaultHandler) { |
| /* Install default int handler */ |
| Py_INCREF(IntHandler); |
| Py_DECREF(Handlers[SIGINT].func); |
| Handlers[SIGINT].func = IntHandler; |
| old_siginthandler = PyOS_setsig(SIGINT, &signal_handler); |
| } |
| |
| #ifdef SIGHUP |
| x = PyInt_FromLong(SIGHUP); |
| PyDict_SetItemString(d, "SIGHUP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGINT |
| x = PyInt_FromLong(SIGINT); |
| PyDict_SetItemString(d, "SIGINT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGBREAK |
| x = PyInt_FromLong(SIGBREAK); |
| PyDict_SetItemString(d, "SIGBREAK", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGQUIT |
| x = PyInt_FromLong(SIGQUIT); |
| PyDict_SetItemString(d, "SIGQUIT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGILL |
| x = PyInt_FromLong(SIGILL); |
| PyDict_SetItemString(d, "SIGILL", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTRAP |
| x = PyInt_FromLong(SIGTRAP); |
| PyDict_SetItemString(d, "SIGTRAP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGIOT |
| x = PyInt_FromLong(SIGIOT); |
| PyDict_SetItemString(d, "SIGIOT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGABRT |
| x = PyInt_FromLong(SIGABRT); |
| PyDict_SetItemString(d, "SIGABRT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGEMT |
| x = PyInt_FromLong(SIGEMT); |
| PyDict_SetItemString(d, "SIGEMT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGFPE |
| x = PyInt_FromLong(SIGFPE); |
| PyDict_SetItemString(d, "SIGFPE", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGKILL |
| x = PyInt_FromLong(SIGKILL); |
| PyDict_SetItemString(d, "SIGKILL", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGBUS |
| x = PyInt_FromLong(SIGBUS); |
| PyDict_SetItemString(d, "SIGBUS", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGSEGV |
| x = PyInt_FromLong(SIGSEGV); |
| PyDict_SetItemString(d, "SIGSEGV", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGSYS |
| x = PyInt_FromLong(SIGSYS); |
| PyDict_SetItemString(d, "SIGSYS", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPIPE |
| x = PyInt_FromLong(SIGPIPE); |
| PyDict_SetItemString(d, "SIGPIPE", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGALRM |
| x = PyInt_FromLong(SIGALRM); |
| PyDict_SetItemString(d, "SIGALRM", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTERM |
| x = PyInt_FromLong(SIGTERM); |
| PyDict_SetItemString(d, "SIGTERM", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGUSR1 |
| x = PyInt_FromLong(SIGUSR1); |
| PyDict_SetItemString(d, "SIGUSR1", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGUSR2 |
| x = PyInt_FromLong(SIGUSR2); |
| PyDict_SetItemString(d, "SIGUSR2", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGCLD |
| x = PyInt_FromLong(SIGCLD); |
| PyDict_SetItemString(d, "SIGCLD", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGCHLD |
| x = PyInt_FromLong(SIGCHLD); |
| PyDict_SetItemString(d, "SIGCHLD", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPWR |
| x = PyInt_FromLong(SIGPWR); |
| PyDict_SetItemString(d, "SIGPWR", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGIO |
| x = PyInt_FromLong(SIGIO); |
| PyDict_SetItemString(d, "SIGIO", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGURG |
| x = PyInt_FromLong(SIGURG); |
| PyDict_SetItemString(d, "SIGURG", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGWINCH |
| x = PyInt_FromLong(SIGWINCH); |
| PyDict_SetItemString(d, "SIGWINCH", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPOLL |
| x = PyInt_FromLong(SIGPOLL); |
| PyDict_SetItemString(d, "SIGPOLL", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGSTOP |
| x = PyInt_FromLong(SIGSTOP); |
| PyDict_SetItemString(d, "SIGSTOP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTSTP |
| x = PyInt_FromLong(SIGTSTP); |
| PyDict_SetItemString(d, "SIGTSTP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGCONT |
| x = PyInt_FromLong(SIGCONT); |
| PyDict_SetItemString(d, "SIGCONT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTTIN |
| x = PyInt_FromLong(SIGTTIN); |
| PyDict_SetItemString(d, "SIGTTIN", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTTOU |
| x = PyInt_FromLong(SIGTTOU); |
| PyDict_SetItemString(d, "SIGTTOU", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGVTALRM |
| x = PyInt_FromLong(SIGVTALRM); |
| PyDict_SetItemString(d, "SIGVTALRM", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPROF |
| x = PyInt_FromLong(SIGPROF); |
| PyDict_SetItemString(d, "SIGPROF", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGXCPU |
| x = PyInt_FromLong(SIGXCPU); |
| PyDict_SetItemString(d, "SIGXCPU", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGXFSZ |
| x = PyInt_FromLong(SIGXFSZ); |
| PyDict_SetItemString(d, "SIGXFSZ", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGINFO |
| x = PyInt_FromLong(SIGINFO); |
| PyDict_SetItemString(d, "SIGINFO", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef HAVE_SIGPROCMASK |
| x = PyInt_FromLong(SIG_BLOCK); |
| PyDict_SetItemString(d, "SIG_BLOCK", x); |
| Py_XDECREF(x); |
| x = PyInt_FromLong(SIG_UNBLOCK); |
| PyDict_SetItemString(d, "SIG_UNBLOCK", x); |
| Py_XDECREF(x); |
| x = PyInt_FromLong(SIG_SETMASK); |
| PyDict_SetItemString(d, "SIG_SETMASK", x); |
| Py_XDECREF(x); |
| #endif |
| |
| if (!PyErr_Occurred()) |
| return; |
| |
| /* Check for errors */ |
| finally: |
| return; |
| } |
| |
| static void |
| finisignal(void) |
| { |
| int i; |
| PyObject *func; |
| |
| PyOS_setsig(SIGINT, old_siginthandler); |
| old_siginthandler = SIG_DFL; |
| |
| for (i = 1; i < NSIG; i++) { |
| func = Handlers[i].func; |
| Handlers[i].tripped = 0; |
| Handlers[i].func = NULL; |
| if (i != SIGINT && func != NULL && func != Py_None && |
| func != DefaultHandler && func != IgnoreHandler) |
| PyOS_setsig(i, SIG_DFL); |
| Py_XDECREF(func); |
| } |
| |
| Py_XDECREF(IntHandler); |
| IntHandler = NULL; |
| Py_XDECREF(DefaultHandler); |
| DefaultHandler = NULL; |
| Py_XDECREF(IgnoreHandler); |
| IgnoreHandler = NULL; |
| } |
| |
| |
| /* Declared in pyerrors.h */ |
| int |
| PyErr_CheckSignals(void) |
| { |
| int i; |
| PyObject *f; |
| |
| if (!is_tripped) |
| return 0; |
| #ifdef WITH_THREAD |
| if (PyThread_get_thread_ident() != main_thread) |
| return 0; |
| #endif |
| if (!(f = PyEval_GetFrame())) |
| f = Py_None; |
| |
| for (i = 1; i < NSIG; i++) { |
| if (Handlers[i].tripped) { |
| PyObject *result = NULL; |
| PyObject *arglist = Py_BuildValue("(iO)", i, f); |
| Handlers[i].tripped = 0; |
| |
| if (arglist) { |
| result = PyEval_CallObject(Handlers[i].func, |
| arglist); |
| Py_DECREF(arglist); |
| } |
| if (!result) |
| return -1; |
| |
| Py_DECREF(result); |
| } |
| } |
| is_tripped = 0; |
| return 0; |
| } |
| |
| |
| /* Replacements for intrcheck.c functionality |
| * Declared in pyerrors.h |
| */ |
| void |
| PyErr_SetInterrupt(void) |
| { |
| is_tripped++; |
| Handlers[SIGINT].tripped = 1; |
| Py_AddPendingCall((int (*)(void *))PyErr_CheckSignals, NULL); |
| } |
| |
| void |
| PyOS_InitInterrupts(void) |
| { |
| initsignal(); |
| _PyImport_FixupExtension("signal", "signal"); |
| } |
| |
| void |
| PyOS_FiniInterrupts(void) |
| { |
| finisignal(); |
| } |
| |
| int |
| PyOS_InterruptOccurred(void) |
| { |
| if (Handlers[SIGINT].tripped) { |
| #ifdef WITH_THREAD |
| if (PyThread_get_thread_ident() != main_thread) |
| return 0; |
| #endif |
| Handlers[SIGINT].tripped = 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| void |
| PyOS_AfterFork(void) |
| { |
| #ifdef WITH_THREAD |
| PyEval_ReInitThreads(); |
| main_thread = PyThread_get_thread_ident(); |
| main_pid = getpid(); |
| #endif |
| } |