| |
| /* 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_WINDOWS |
| #include <Windows.h> |
| #ifdef HAVE_PROCESS_H |
| #include <process.h> |
| #endif |
| #endif |
| |
| #ifdef HAVE_SIGNAL_H |
| #include <signal.h> |
| #endif |
| #ifdef HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #ifdef HAVE_SYS_TIME_H |
| #include <sys/time.h> |
| #endif |
| |
| #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 sig_atomic_t wakeup_fd = -1; |
| |
| /* Speed up sigcheck() when none tripped */ |
| static volatile sig_atomic_t is_tripped = 0; |
| |
| 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; |
| |
| #ifdef HAVE_GETITIMER |
| static PyObject *ItimerError; |
| |
| /* auxiliary functions for setitimer/getitimer */ |
| static void |
| timeval_from_double(double d, struct timeval *tv) |
| { |
| tv->tv_sec = floor(d); |
| tv->tv_usec = fmod(d, 1.0) * 1000000.0; |
| } |
| |
| Py_LOCAL_INLINE(double) |
| double_from_timeval(struct timeval *tv) |
| { |
| return tv->tv_sec + (double)(tv->tv_usec / 1000000.0); |
| } |
| |
| static PyObject * |
| itimer_retval(struct itimerval *iv) |
| { |
| PyObject *r, *v; |
| |
| r = PyTuple_New(2); |
| if (r == NULL) |
| return NULL; |
| |
| if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_value)))) { |
| Py_DECREF(r); |
| return NULL; |
| } |
| |
| PyTuple_SET_ITEM(r, 0, v); |
| |
| if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_interval)))) { |
| Py_DECREF(r); |
| return NULL; |
| } |
| |
| PyTuple_SET_ITEM(r, 1, v); |
| |
| return r; |
| } |
| #endif |
| |
| static PyObject * |
| signal_default_int_handler(PyObject *self, PyObject *args) |
| { |
| PyErr_SetNone(PyExc_KeyboardInterrupt); |
| return NULL; |
| } |
| |
| PyDoc_STRVAR(default_int_handler_doc, |
| "default_int_handler(...)\n\ |
| \n\ |
| The default handler for SIGINT installed 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 |
| Handlers[sig_num].tripped = 1; |
| /* Set is_tripped after setting .tripped, as it gets |
| cleared in PyErr_CheckSignals() before .tripped. */ |
| is_tripped = 1; |
| Py_AddPendingCall(checksignals_witharg, NULL); |
| if (wakeup_fd != -1) |
| write(wakeup_fd, "\0", 1); |
| #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 |
| 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 PyLong_FromLong((long)alarm(t)); |
| } |
| |
| PyDoc_STRVAR(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; |
| } |
| PyDoc_STRVAR(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; |
| 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; |
| } |
| |
| PyDoc_STRVAR(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; |
| } |
| |
| PyDoc_STRVAR(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"); |
| |
| #ifdef HAVE_SIGINTERRUPT |
| PyDoc_STRVAR(siginterrupt_doc, |
| "siginterrupt(sig, flag) -> None\n\ |
| change system call restart behaviour: if flag is False, system calls\n\ |
| will be restarted when interrupted by signal sig, else system calls\n\ |
| will be interrupted."); |
| |
| static PyObject * |
| signal_siginterrupt(PyObject *self, PyObject *args) |
| { |
| int sig_num; |
| int flag; |
| |
| if (!PyArg_ParseTuple(args, "ii:siginterrupt", &sig_num, &flag)) |
| return NULL; |
| if (sig_num < 1 || sig_num >= NSIG) { |
| PyErr_SetString(PyExc_ValueError, |
| "signal number out of range"); |
| return NULL; |
| } |
| if (siginterrupt(sig_num, flag)<0) { |
| PyErr_SetFromErrno(PyExc_RuntimeError); |
| return NULL; |
| } |
| |
| Py_INCREF(Py_None); |
| return Py_None; |
| } |
| |
| #endif |
| |
| static PyObject * |
| signal_set_wakeup_fd(PyObject *self, PyObject *args) |
| { |
| struct stat buf; |
| int fd, old_fd; |
| if (!PyArg_ParseTuple(args, "i:set_wakeup_fd", &fd)) |
| return NULL; |
| #ifdef WITH_THREAD |
| if (PyThread_get_thread_ident() != main_thread) { |
| PyErr_SetString(PyExc_ValueError, |
| "set_wakeup_fd only works in main thread"); |
| return NULL; |
| } |
| #endif |
| if (fd != -1 && fstat(fd, &buf) != 0) { |
| PyErr_SetString(PyExc_ValueError, "invalid fd"); |
| return NULL; |
| } |
| old_fd = wakeup_fd; |
| wakeup_fd = fd; |
| return PyLong_FromLong(old_fd); |
| } |
| |
| PyDoc_STRVAR(set_wakeup_fd_doc, |
| "set_wakeup_fd(fd) -> fd\n\ |
| \n\ |
| Sets the fd to be written to (with '\\0') when a signal\n\ |
| comes in. A library can use this to wakeup select or poll.\n\ |
| The previous fd is returned.\n\ |
| \n\ |
| The fd must be non-blocking."); |
| |
| /* C API for the same, without all the error checking */ |
| int |
| PySignal_SetWakeupFd(int fd) |
| { |
| int old_fd = wakeup_fd; |
| if (fd < 0) |
| fd = -1; |
| wakeup_fd = fd; |
| return old_fd; |
| } |
| |
| |
| #ifdef HAVE_SETITIMER |
| static PyObject * |
| signal_setitimer(PyObject *self, PyObject *args) |
| { |
| double first; |
| double interval = 0; |
| int which; |
| struct itimerval new, old; |
| |
| if(!PyArg_ParseTuple(args, "id|d:setitimer", &which, &first, &interval)) |
| return NULL; |
| |
| timeval_from_double(first, &new.it_value); |
| timeval_from_double(interval, &new.it_interval); |
| /* Let OS check "which" value */ |
| if (setitimer(which, &new, &old) != 0) { |
| PyErr_SetFromErrno(ItimerError); |
| return NULL; |
| } |
| |
| return itimer_retval(&old); |
| } |
| |
| PyDoc_STRVAR(setitimer_doc, |
| "setitimer(which, seconds[, interval])\n\ |
| \n\ |
| Sets given itimer (one of ITIMER_REAL, ITIMER_VIRTUAL\n\ |
| or ITIMER_PROF) to fire after value seconds and after\n\ |
| that every interval seconds.\n\ |
| The itimer can be cleared by setting seconds to zero.\n\ |
| \n\ |
| Returns old values as a tuple: (delay, interval)."); |
| #endif |
| |
| |
| #ifdef HAVE_GETITIMER |
| static PyObject * |
| signal_getitimer(PyObject *self, PyObject *args) |
| { |
| int which; |
| struct itimerval old; |
| |
| if (!PyArg_ParseTuple(args, "i:getitimer", &which)) |
| return NULL; |
| |
| if (getitimer(which, &old) != 0) { |
| PyErr_SetFromErrno(ItimerError); |
| return NULL; |
| } |
| |
| return itimer_retval(&old); |
| } |
| |
| PyDoc_STRVAR(getitimer_doc, |
| "getitimer(which)\n\ |
| \n\ |
| Returns current value of given itimer."); |
| #endif |
| |
| |
| /* List of functions defined in the module */ |
| static PyMethodDef signal_methods[] = { |
| #ifdef HAVE_ALARM |
| {"alarm", signal_alarm, METH_VARARGS, alarm_doc}, |
| #endif |
| #ifdef HAVE_SETITIMER |
| {"setitimer", signal_setitimer, METH_VARARGS, setitimer_doc}, |
| #endif |
| #ifdef HAVE_GETITIMER |
| {"getitimer", signal_getitimer, METH_VARARGS, getitimer_doc}, |
| #endif |
| {"signal", signal_signal, METH_VARARGS, signal_doc}, |
| {"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc}, |
| {"set_wakeup_fd", signal_set_wakeup_fd, METH_VARARGS, set_wakeup_fd_doc}, |
| #ifdef HAVE_SIGINTERRUPT |
| {"siginterrupt", signal_siginterrupt, METH_VARARGS, siginterrupt_doc}, |
| #endif |
| #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}, |
| {NULL, NULL} /* sentinel */ |
| }; |
| |
| |
| PyDoc_STRVAR(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\ |
| setitimer() -- cause a signal (described below) after a specified\n\ |
| float time and the timer may restart then [Unix only]\n\ |
| getitimer() -- get current value of timer [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\ |
| signal constants:\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\ |
| SIGINT, SIGTERM, etc. -- signal numbers\n\ |
| \n\ |
| itimer constants:\n\ |
| ITIMER_REAL -- decrements in real time, and delivers SIGALRM upon\n\ |
| expiration\n\ |
| ITIMER_VIRTUAL -- decrements only when the process is executing,\n\ |
| and delivers SIGVTALRM upon expiration\n\ |
| ITIMER_PROF -- decrements both when the process is executing and\n\ |
| when the system is executing on behalf of the process.\n\ |
| Coupled with ITIMER_VIRTUAL, this timer is usually\n\ |
| used to profile the time spent by the application\n\ |
| in user and kernel space. SIGPROF is delivered upon\n\ |
| expiration.\n\ |
| \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 struct PyModuleDef signalmodule = { |
| PyModuleDef_HEAD_INIT, |
| "signal", |
| module_doc, |
| -1, |
| signal_methods, |
| NULL, |
| NULL, |
| NULL, |
| NULL |
| }; |
| |
| PyMODINIT_FUNC |
| PyInit_signal(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 = PyModule_Create(&signalmodule); |
| if (m == NULL) |
| return NULL; |
| |
| /* 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 = PyLong_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 = PyLong_FromLong(SIGHUP); |
| PyDict_SetItemString(d, "SIGHUP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGINT |
| x = PyLong_FromLong(SIGINT); |
| PyDict_SetItemString(d, "SIGINT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGBREAK |
| x = PyLong_FromLong(SIGBREAK); |
| PyDict_SetItemString(d, "SIGBREAK", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGQUIT |
| x = PyLong_FromLong(SIGQUIT); |
| PyDict_SetItemString(d, "SIGQUIT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGILL |
| x = PyLong_FromLong(SIGILL); |
| PyDict_SetItemString(d, "SIGILL", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTRAP |
| x = PyLong_FromLong(SIGTRAP); |
| PyDict_SetItemString(d, "SIGTRAP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGIOT |
| x = PyLong_FromLong(SIGIOT); |
| PyDict_SetItemString(d, "SIGIOT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGABRT |
| x = PyLong_FromLong(SIGABRT); |
| PyDict_SetItemString(d, "SIGABRT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGEMT |
| x = PyLong_FromLong(SIGEMT); |
| PyDict_SetItemString(d, "SIGEMT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGFPE |
| x = PyLong_FromLong(SIGFPE); |
| PyDict_SetItemString(d, "SIGFPE", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGKILL |
| x = PyLong_FromLong(SIGKILL); |
| PyDict_SetItemString(d, "SIGKILL", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGBUS |
| x = PyLong_FromLong(SIGBUS); |
| PyDict_SetItemString(d, "SIGBUS", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGSEGV |
| x = PyLong_FromLong(SIGSEGV); |
| PyDict_SetItemString(d, "SIGSEGV", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGSYS |
| x = PyLong_FromLong(SIGSYS); |
| PyDict_SetItemString(d, "SIGSYS", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPIPE |
| x = PyLong_FromLong(SIGPIPE); |
| PyDict_SetItemString(d, "SIGPIPE", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGALRM |
| x = PyLong_FromLong(SIGALRM); |
| PyDict_SetItemString(d, "SIGALRM", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTERM |
| x = PyLong_FromLong(SIGTERM); |
| PyDict_SetItemString(d, "SIGTERM", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGUSR1 |
| x = PyLong_FromLong(SIGUSR1); |
| PyDict_SetItemString(d, "SIGUSR1", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGUSR2 |
| x = PyLong_FromLong(SIGUSR2); |
| PyDict_SetItemString(d, "SIGUSR2", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGCLD |
| x = PyLong_FromLong(SIGCLD); |
| PyDict_SetItemString(d, "SIGCLD", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGCHLD |
| x = PyLong_FromLong(SIGCHLD); |
| PyDict_SetItemString(d, "SIGCHLD", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPWR |
| x = PyLong_FromLong(SIGPWR); |
| PyDict_SetItemString(d, "SIGPWR", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGIO |
| x = PyLong_FromLong(SIGIO); |
| PyDict_SetItemString(d, "SIGIO", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGURG |
| x = PyLong_FromLong(SIGURG); |
| PyDict_SetItemString(d, "SIGURG", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGWINCH |
| x = PyLong_FromLong(SIGWINCH); |
| PyDict_SetItemString(d, "SIGWINCH", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPOLL |
| x = PyLong_FromLong(SIGPOLL); |
| PyDict_SetItemString(d, "SIGPOLL", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGSTOP |
| x = PyLong_FromLong(SIGSTOP); |
| PyDict_SetItemString(d, "SIGSTOP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTSTP |
| x = PyLong_FromLong(SIGTSTP); |
| PyDict_SetItemString(d, "SIGTSTP", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGCONT |
| x = PyLong_FromLong(SIGCONT); |
| PyDict_SetItemString(d, "SIGCONT", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTTIN |
| x = PyLong_FromLong(SIGTTIN); |
| PyDict_SetItemString(d, "SIGTTIN", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGTTOU |
| x = PyLong_FromLong(SIGTTOU); |
| PyDict_SetItemString(d, "SIGTTOU", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGVTALRM |
| x = PyLong_FromLong(SIGVTALRM); |
| PyDict_SetItemString(d, "SIGVTALRM", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGPROF |
| x = PyLong_FromLong(SIGPROF); |
| PyDict_SetItemString(d, "SIGPROF", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGXCPU |
| x = PyLong_FromLong(SIGXCPU); |
| PyDict_SetItemString(d, "SIGXCPU", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGXFSZ |
| x = PyLong_FromLong(SIGXFSZ); |
| PyDict_SetItemString(d, "SIGXFSZ", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGRTMIN |
| x = PyLong_FromLong(SIGRTMIN); |
| PyDict_SetItemString(d, "SIGRTMIN", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGRTMAX |
| x = PyLong_FromLong(SIGRTMAX); |
| PyDict_SetItemString(d, "SIGRTMAX", x); |
| Py_XDECREF(x); |
| #endif |
| #ifdef SIGINFO |
| x = PyLong_FromLong(SIGINFO); |
| PyDict_SetItemString(d, "SIGINFO", x); |
| Py_XDECREF(x); |
| #endif |
| |
| #ifdef ITIMER_REAL |
| x = PyLong_FromLong(ITIMER_REAL); |
| PyDict_SetItemString(d, "ITIMER_REAL", x); |
| Py_DECREF(x); |
| #endif |
| #ifdef ITIMER_VIRTUAL |
| x = PyLong_FromLong(ITIMER_VIRTUAL); |
| PyDict_SetItemString(d, "ITIMER_VIRTUAL", x); |
| Py_DECREF(x); |
| #endif |
| #ifdef ITIMER_PROF |
| x = PyLong_FromLong(ITIMER_PROF); |
| PyDict_SetItemString(d, "ITIMER_PROF", x); |
| Py_DECREF(x); |
| #endif |
| |
| #if defined (HAVE_SETITIMER) || defined (HAVE_GETITIMER) |
| ItimerError = PyErr_NewException("signal.ItimerError", |
| PyExc_IOError, NULL); |
| if (ItimerError != NULL) |
| PyDict_SetItemString(d, "ItimerError", ItimerError); |
| #endif |
| |
| #ifdef CTRL_C_EVENT |
| x = PyLong_FromLong(CTRL_C_EVENT); |
| PyDict_SetItemString(d, "CTRL_C_EVENT", x); |
| Py_DECREF(x); |
| #endif |
| |
| #ifdef CTRL_BREAK_EVENT |
| x = PyLong_FromLong(CTRL_BREAK_EVENT); |
| PyDict_SetItemString(d, "CTRL_BREAK_EVENT", x); |
| Py_DECREF(x); |
| #endif |
| |
| if (PyErr_Occurred()) { |
| Py_DECREF(m); |
| m = NULL; |
| } |
| |
| finally: |
| return m; |
| } |
| |
| 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 |
| |
| /* |
| * The is_tripped variable is meant to speed up the calls to |
| * PyErr_CheckSignals (both directly or via pending calls) when no |
| * signal has arrived. This variable is set to 1 when a signal arrives |
| * and it is set to 0 here, when we know some signals arrived. This way |
| * we can run the registered handlers with no signals blocked. |
| * |
| * NOTE: with this approach we can have a situation where is_tripped is |
| * 1 but we have no more signals to handle (Handlers[i].tripped |
| * is 0 for every signal i). This won't do us any harm (except |
| * we're gonna spent some cycles for nothing). This happens when |
| * we receive a signal i after we zero is_tripped and before we |
| * check Handlers[i].tripped. |
| */ |
| is_tripped = 0; |
| |
| if (!(f = (PyObject *)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); |
| } |
| } |
| |
| return 0; |
| } |
| |
| |
| /* Replacements for intrcheck.c functionality |
| * Declared in pyerrors.h |
| */ |
| void |
| PyErr_SetInterrupt(void) |
| { |
| is_tripped = 1; |
| Handlers[SIGINT].tripped = 1; |
| Py_AddPendingCall((int (*)(void *))PyErr_CheckSignals, NULL); |
| } |
| |
| void |
| PyOS_InitInterrupts(void) |
| { |
| PyObject *m = PyInit_signal(); |
| if (m) { |
| _PyImport_FixupExtension(m, "signal", "signal"); |
| Py_DECREF(m); |
| } |
| } |
| |
| 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(); |
| _PyImport_ReInitLock(); |
| PyThread_ReInitTLS(); |
| #endif |
| } |