mirror of
https://github.com/python/cpython.git
synced 2025-11-03 07:01:21 +00:00
9e8181b809
I can't test this, so I'm just checking it in with blind faith in Andy. I've tested that it doesn't broeak a non-Pth build on Linux. Changes include: - There's a --with-pth configure option. - Instead of _GNU_PTH, we test for HAVE_PTH. - Better signal handling. - (The config.h.in file is regenerated in a slightly different order.)
661 lines
15 KiB
C
661 lines
15 KiB
C
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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_WIN32
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#include <process.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.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)
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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 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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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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static char 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_Parse(args, "i", &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(alarm(t));
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}
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static char 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, PyObject *args)
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{
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if (!PyArg_NoArgs(args))
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return NULL;
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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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static char 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_Parse(args, "(iO)", &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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static char 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_Parse(args, "i", &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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static char 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\n\
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";
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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_OLDARGS, alarm_doc},
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#endif
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{"signal", signal_signal, METH_OLDARGS, signal_doc},
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{"getsignal", signal_getsignal, METH_OLDARGS, getsignal_doc},
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#ifdef HAVE_PAUSE
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{"pause", signal_pause, METH_OLDARGS, pause_doc},
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#endif
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{"default_int_handler", signal_default_int_handler,
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METH_OLDARGS, default_int_handler_doc},
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{NULL, NULL} /* sentinel */
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};
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static char 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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DL_EXPORT(void)
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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 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);
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#endif
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#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);
|
|
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
|
|
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
|
|
}
|