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674 lines
16 KiB
674 lines
16 KiB
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/* Signal module -- many thanks to Lance Ellinghaus */ |
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/* XXX Signals should be recorded per thread, now we have thread state. */ |
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#include "Python.h" |
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#include "intrcheck.h" |
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#ifdef MS_WINDOWS |
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#include <process.h> |
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#endif |
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#include <signal.h> |
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#ifndef SIG_ERR |
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#define SIG_ERR ((PyOS_sighandler_t)(-1)) |
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#endif |
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#if defined(PYOS_OS2) && !defined(PYCC_GCC) |
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#define NSIG 12 |
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#include <process.h> |
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#endif |
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#ifndef NSIG |
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# if defined(_NSIG) |
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# define NSIG _NSIG /* For BSD/SysV */ |
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# elif defined(_SIGMAX) |
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# define NSIG (_SIGMAX + 1) /* For QNX */ |
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# elif defined(SIGMAX) |
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# define NSIG (SIGMAX + 1) /* For djgpp */ |
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# else |
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# define NSIG 64 /* Use a reasonable default value */ |
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# endif |
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#endif |
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/* |
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NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS |
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When threads are supported, we want the following semantics: |
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- only the main thread can set a signal handler |
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- any thread can get a signal handler |
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- signals are only delivered to the main thread |
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I.e. we don't support "synchronous signals" like SIGFPE (catching |
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this doesn't make much sense in Python anyway) nor do we support |
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signals as a means of inter-thread communication, since not all |
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thread implementations support that (at least our thread library |
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doesn't). |
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We still have the problem that in some implementations signals |
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generated by the keyboard (e.g. SIGINT) are delivered to all |
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threads (e.g. SGI), while in others (e.g. Solaris) such signals are |
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delivered to one random thread (an intermediate possibility would |
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be to deliver it to the main thread -- POSIX?). For now, we have |
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a working implementation that works in all three cases -- the |
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handler ignores signals if getpid() isn't the same as in the main |
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thread. XXX This is a hack. |
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GNU pth is a user-space threading library, and as such, all threads |
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run within the same process. In this case, if the currently running |
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thread is not the main_thread, send the signal to the main_thread. |
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*/ |
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#ifdef MS_XBOX |
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// No pid on Xbox |
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#undef WITH_THREAD |
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#endif |
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#ifdef WITH_THREAD |
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#include <sys/types.h> /* For pid_t */ |
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#include "pythread.h" |
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static long main_thread; |
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static pid_t main_pid; |
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#endif |
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static struct { |
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int tripped; |
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PyObject *func; |
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} Handlers[NSIG]; |
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static int is_tripped = 0; /* Speed up sigcheck() when none tripped */ |
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static PyObject *DefaultHandler; |
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static PyObject *IgnoreHandler; |
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static PyObject *IntHandler; |
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/* On Solaris 8, gcc will produce a warning that the function |
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declaration is not a prototype. This is caused by the definition of |
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SIG_DFL as (void (*)())0; the correct declaration would have been |
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(void (*)(int))0. */ |
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static PyOS_sighandler_t old_siginthandler = SIG_DFL; |
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static PyObject * |
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signal_default_int_handler(PyObject *self, PyObject *args) |
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{ |
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PyErr_SetNone(PyExc_KeyboardInterrupt); |
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return NULL; |
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} |
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PyDoc_STRVAR(default_int_handler_doc, |
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"default_int_handler(...)\n\ |
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\n\ |
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The default handler for SIGINT instated by Python.\n\ |
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It raises KeyboardInterrupt."); |
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static int |
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checksignals_witharg(void * unused) |
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{ |
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return PyErr_CheckSignals(); |
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} |
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static void |
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signal_handler(int sig_num) |
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{ |
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#ifdef WITH_THREAD |
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#ifdef WITH_PTH |
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if (PyThread_get_thread_ident() != main_thread) { |
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pth_raise(*(pth_t *) main_thread, sig_num); |
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return; |
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} |
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#endif |
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/* See NOTES section above */ |
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if (getpid() == main_pid) { |
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#endif |
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is_tripped++; |
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Handlers[sig_num].tripped = 1; |
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Py_AddPendingCall(checksignals_witharg, NULL); |
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#ifdef WITH_THREAD |
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} |
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#endif |
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#ifdef SIGCHLD |
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if (sig_num == SIGCHLD) { |
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/* To avoid infinite recursion, this signal remains |
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reset until explicit re-instated. |
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Don't clear the 'func' field as it is our pointer |
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to the Python handler... */ |
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return; |
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} |
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#endif |
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#ifdef HAVE_SIGINTERRUPT |
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siginterrupt(sig_num, 1); |
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#endif |
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PyOS_setsig(sig_num, signal_handler); |
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} |
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#ifdef HAVE_ALARM |
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static PyObject * |
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signal_alarm(PyObject *self, PyObject *args) |
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{ |
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int t; |
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if (!PyArg_ParseTuple(args, "i:alarm", &t)) |
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return NULL; |
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/* alarm() returns the number of seconds remaining */ |
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return PyInt_FromLong((long)alarm(t)); |
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} |
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PyDoc_STRVAR(alarm_doc, |
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"alarm(seconds)\n\ |
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\n\ |
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Arrange for SIGALRM to arrive after the given number of seconds."); |
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#endif |
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#ifdef HAVE_PAUSE |
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static PyObject * |
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signal_pause(PyObject *self) |
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{ |
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Py_BEGIN_ALLOW_THREADS |
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(void)pause(); |
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Py_END_ALLOW_THREADS |
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/* make sure that any exceptions that got raised are propagated |
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* back into Python |
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*/ |
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if (PyErr_CheckSignals()) |
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return NULL; |
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Py_INCREF(Py_None); |
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return Py_None; |
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} |
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PyDoc_STRVAR(pause_doc, |
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"pause()\n\ |
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\n\ |
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Wait until a signal arrives."); |
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#endif |
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static PyObject * |
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signal_signal(PyObject *self, PyObject *args) |
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{ |
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PyObject *obj; |
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int sig_num; |
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PyObject *old_handler; |
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void (*func)(int); |
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if (!PyArg_ParseTuple(args, "iO:signal", &sig_num, &obj)) |
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return NULL; |
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#ifdef WITH_THREAD |
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if (PyThread_get_thread_ident() != main_thread) { |
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PyErr_SetString(PyExc_ValueError, |
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"signal only works in main thread"); |
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return NULL; |
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} |
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#endif |
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if (sig_num < 1 || sig_num >= NSIG) { |
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PyErr_SetString(PyExc_ValueError, |
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"signal number out of range"); |
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return NULL; |
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} |
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if (obj == IgnoreHandler) |
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func = SIG_IGN; |
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else if (obj == DefaultHandler) |
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func = SIG_DFL; |
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else if (!PyCallable_Check(obj)) { |
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PyErr_SetString(PyExc_TypeError, |
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"signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object"); |
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return NULL; |
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} |
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else |
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func = signal_handler; |
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#ifdef HAVE_SIGINTERRUPT |
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siginterrupt(sig_num, 1); |
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#endif |
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if (PyOS_setsig(sig_num, func) == SIG_ERR) { |
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PyErr_SetFromErrno(PyExc_RuntimeError); |
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return NULL; |
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} |
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old_handler = Handlers[sig_num].func; |
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Handlers[sig_num].tripped = 0; |
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Py_INCREF(obj); |
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Handlers[sig_num].func = obj; |
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return old_handler; |
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} |
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PyDoc_STRVAR(signal_doc, |
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"signal(sig, action) -> action\n\ |
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\n\ |
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Set the action for the given signal. The action can be SIG_DFL,\n\ |
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SIG_IGN, or a callable Python object. The previous action is\n\ |
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returned. See getsignal() for possible return values.\n\ |
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\n\ |
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*** IMPORTANT NOTICE ***\n\ |
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A signal handler function is called with two arguments:\n\ |
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the first is the signal number, the second is the interrupted stack frame."); |
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static PyObject * |
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signal_getsignal(PyObject *self, PyObject *args) |
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{ |
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int sig_num; |
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PyObject *old_handler; |
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if (!PyArg_ParseTuple(args, "i:getsignal", &sig_num)) |
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return NULL; |
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if (sig_num < 1 || sig_num >= NSIG) { |
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PyErr_SetString(PyExc_ValueError, |
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"signal number out of range"); |
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return NULL; |
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} |
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old_handler = Handlers[sig_num].func; |
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Py_INCREF(old_handler); |
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return old_handler; |
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} |
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PyDoc_STRVAR(getsignal_doc, |
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"getsignal(sig) -> action\n\ |
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\n\ |
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Return the current action for the given signal. The return value can be:\n\ |
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SIG_IGN -- if the signal is being ignored\n\ |
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SIG_DFL -- if the default action for the signal is in effect\n\ |
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None -- if an unknown handler is in effect\n\ |
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anything else -- the callable Python object used as a handler"); |
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/* List of functions defined in the module */ |
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static PyMethodDef signal_methods[] = { |
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#ifdef HAVE_ALARM |
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{"alarm", signal_alarm, METH_VARARGS, alarm_doc}, |
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#endif |
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{"signal", signal_signal, METH_VARARGS, signal_doc}, |
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{"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc}, |
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#ifdef HAVE_PAUSE |
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{"pause", (PyCFunction)signal_pause, |
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METH_NOARGS,pause_doc}, |
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#endif |
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{"default_int_handler", signal_default_int_handler, |
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METH_VARARGS, default_int_handler_doc}, |
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{NULL, NULL} /* sentinel */ |
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}; |
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PyDoc_STRVAR(module_doc, |
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"This module provides mechanisms to use signal handlers in Python.\n\ |
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\n\ |
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Functions:\n\ |
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\n\ |
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alarm() -- cause SIGALRM after a specified time [Unix only]\n\ |
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signal() -- set the action for a given signal\n\ |
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getsignal() -- get the signal action for a given signal\n\ |
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pause() -- wait until a signal arrives [Unix only]\n\ |
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default_int_handler() -- default SIGINT handler\n\ |
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\n\ |
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Constants:\n\ |
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\n\ |
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SIG_DFL -- used to refer to the system default handler\n\ |
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SIG_IGN -- used to ignore the signal\n\ |
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NSIG -- number of defined signals\n\ |
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\n\ |
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SIGINT, SIGTERM, etc. -- signal numbers\n\ |
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\n\ |
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*** IMPORTANT NOTICE ***\n\ |
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A signal handler function is called with two arguments:\n\ |
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the first is the signal number, the second is the interrupted stack frame."); |
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PyMODINIT_FUNC |
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initsignal(void) |
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{ |
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PyObject *m, *d, *x; |
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int i; |
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#ifdef WITH_THREAD |
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main_thread = PyThread_get_thread_ident(); |
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main_pid = getpid(); |
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#endif |
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/* Create the module and add the functions */ |
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m = Py_InitModule3("signal", signal_methods, module_doc); |
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/* Add some symbolic constants to the module */ |
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d = PyModule_GetDict(m); |
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x = DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL); |
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if (!x || PyDict_SetItemString(d, "SIG_DFL", x) < 0) |
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goto finally; |
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x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN); |
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if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0) |
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goto finally; |
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x = PyInt_FromLong((long)NSIG); |
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if (!x || PyDict_SetItemString(d, "NSIG", x) < 0) |
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goto finally; |
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Py_DECREF(x); |
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x = IntHandler = PyDict_GetItemString(d, "default_int_handler"); |
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if (!x) |
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goto finally; |
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Py_INCREF(IntHandler); |
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Handlers[0].tripped = 0; |
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for (i = 1; i < NSIG; i++) { |
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void (*t)(int); |
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t = PyOS_getsig(i); |
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Handlers[i].tripped = 0; |
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if (t == SIG_DFL) |
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Handlers[i].func = DefaultHandler; |
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else if (t == SIG_IGN) |
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Handlers[i].func = IgnoreHandler; |
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else |
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Handlers[i].func = Py_None; /* None of our business */ |
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Py_INCREF(Handlers[i].func); |
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} |
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if (Handlers[SIGINT].func == DefaultHandler) { |
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/* Install default int handler */ |
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Py_INCREF(IntHandler); |
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Py_DECREF(Handlers[SIGINT].func); |
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Handlers[SIGINT].func = IntHandler; |
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old_siginthandler = PyOS_setsig(SIGINT, signal_handler); |
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} |
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#ifdef SIGHUP |
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x = PyInt_FromLong(SIGHUP); |
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PyDict_SetItemString(d, "SIGHUP", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGINT |
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x = PyInt_FromLong(SIGINT); |
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PyDict_SetItemString(d, "SIGINT", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGBREAK |
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x = PyInt_FromLong(SIGBREAK); |
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PyDict_SetItemString(d, "SIGBREAK", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGQUIT |
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x = PyInt_FromLong(SIGQUIT); |
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PyDict_SetItemString(d, "SIGQUIT", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGILL |
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x = PyInt_FromLong(SIGILL); |
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PyDict_SetItemString(d, "SIGILL", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGTRAP |
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x = PyInt_FromLong(SIGTRAP); |
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PyDict_SetItemString(d, "SIGTRAP", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGIOT |
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x = PyInt_FromLong(SIGIOT); |
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PyDict_SetItemString(d, "SIGIOT", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGABRT |
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x = PyInt_FromLong(SIGABRT); |
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PyDict_SetItemString(d, "SIGABRT", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGEMT |
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x = PyInt_FromLong(SIGEMT); |
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PyDict_SetItemString(d, "SIGEMT", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGFPE |
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x = PyInt_FromLong(SIGFPE); |
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PyDict_SetItemString(d, "SIGFPE", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGKILL |
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x = PyInt_FromLong(SIGKILL); |
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PyDict_SetItemString(d, "SIGKILL", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGBUS |
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x = PyInt_FromLong(SIGBUS); |
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PyDict_SetItemString(d, "SIGBUS", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGSEGV |
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x = PyInt_FromLong(SIGSEGV); |
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PyDict_SetItemString(d, "SIGSEGV", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGSYS |
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x = PyInt_FromLong(SIGSYS); |
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PyDict_SetItemString(d, "SIGSYS", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGPIPE |
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x = PyInt_FromLong(SIGPIPE); |
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PyDict_SetItemString(d, "SIGPIPE", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGALRM |
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x = PyInt_FromLong(SIGALRM); |
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PyDict_SetItemString(d, "SIGALRM", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGTERM |
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x = PyInt_FromLong(SIGTERM); |
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PyDict_SetItemString(d, "SIGTERM", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGUSR1 |
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x = PyInt_FromLong(SIGUSR1); |
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PyDict_SetItemString(d, "SIGUSR1", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGUSR2 |
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x = PyInt_FromLong(SIGUSR2); |
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PyDict_SetItemString(d, "SIGUSR2", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGCLD |
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x = PyInt_FromLong(SIGCLD); |
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PyDict_SetItemString(d, "SIGCLD", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGCHLD |
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x = PyInt_FromLong(SIGCHLD); |
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PyDict_SetItemString(d, "SIGCHLD", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGPWR |
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x = PyInt_FromLong(SIGPWR); |
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PyDict_SetItemString(d, "SIGPWR", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGIO |
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x = PyInt_FromLong(SIGIO); |
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PyDict_SetItemString(d, "SIGIO", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGURG |
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x = PyInt_FromLong(SIGURG); |
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PyDict_SetItemString(d, "SIGURG", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGWINCH |
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x = PyInt_FromLong(SIGWINCH); |
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PyDict_SetItemString(d, "SIGWINCH", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGPOLL |
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x = PyInt_FromLong(SIGPOLL); |
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PyDict_SetItemString(d, "SIGPOLL", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGSTOP |
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x = PyInt_FromLong(SIGSTOP); |
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PyDict_SetItemString(d, "SIGSTOP", x); |
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Py_XDECREF(x); |
|
#endif |
|
#ifdef SIGTSTP |
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x = PyInt_FromLong(SIGTSTP); |
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PyDict_SetItemString(d, "SIGTSTP", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGCONT |
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x = PyInt_FromLong(SIGCONT); |
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PyDict_SetItemString(d, "SIGCONT", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGTTIN |
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x = PyInt_FromLong(SIGTTIN); |
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PyDict_SetItemString(d, "SIGTTIN", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGTTOU |
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x = PyInt_FromLong(SIGTTOU); |
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PyDict_SetItemString(d, "SIGTTOU", x); |
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Py_XDECREF(x); |
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#endif |
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#ifdef SIGVTALRM |
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x = PyInt_FromLong(SIGVTALRM); |
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PyDict_SetItemString(d, "SIGVTALRM", x); |
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Py_XDECREF(x); |
|
#endif |
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#ifdef SIGPROF |
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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); |
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PyDict_SetItemString(d, "SIGXFSZ", x); |
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Py_XDECREF(x); |
|
#endif |
|
#ifdef SIGINFO |
|
x = PyInt_FromLong(SIGINFO); |
|
PyDict_SetItemString(d, "SIGINFO", x); |
|
Py_XDECREF(x); |
|
#endif |
|
if (!PyErr_Occurred()) |
|
return; |
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|
|
/* Check for errors */ |
|
finally: |
|
return; |
|
} |
|
|
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static void |
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finisignal(void) |
|
{ |
|
int i; |
|
PyObject *func; |
|
|
|
PyOS_setsig(SIGINT, old_siginthandler); |
|
old_siginthandler = SIG_DFL; |
|
|
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for (i = 1; i < NSIG; i++) { |
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func = Handlers[i].func; |
|
Handlers[i].tripped = 0; |
|
Handlers[i].func = NULL; |
|
if (i != SIGINT && func != NULL && func != Py_None && |
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func != DefaultHandler && func != IgnoreHandler) |
|
PyOS_setsig(i, SIG_DFL); |
|
Py_XDECREF(func); |
|
} |
|
|
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Py_XDECREF(IntHandler); |
|
IntHandler = NULL; |
|
Py_XDECREF(DefaultHandler); |
|
DefaultHandler = NULL; |
|
Py_XDECREF(IgnoreHandler); |
|
IgnoreHandler = NULL; |
|
} |
|
|
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|
|
/* 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 = (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); |
|
} |
|
} |
|
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 |
|
}
|
|
|