| 1 |
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| 2 | /* Signal module -- many thanks to Lance Ellinghaus */
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| 3 |
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| 4 | /* XXX Signals should be recorded per thread, now we have thread state. */
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| 5 |
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| 6 | #include "Python.h"
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| 7 | #include "intrcheck.h"
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| 8 |
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| 9 | #ifdef MS_WINDOWS
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| 10 | #include <process.h>
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| 11 | #endif
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| 12 |
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| 13 | #include <signal.h>
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| 14 |
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| 15 | #ifndef SIG_ERR
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| 16 | #define SIG_ERR ((PyOS_sighandler_t)(-1))
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| 17 | #endif
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| 18 |
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| 19 | #if defined(PYOS_OS2) && !defined(PYCC_GCC)
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| 20 | #define NSIG 12
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| 21 | #include <process.h>
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| 22 | #endif
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| 23 |
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| 24 | #ifndef NSIG
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| 25 | # if defined(_NSIG)
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| 26 | # define NSIG _NSIG /* For BSD/SysV */
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| 27 | # elif defined(_SIGMAX)
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| 28 | # define NSIG (_SIGMAX + 1) /* For QNX */
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| 29 | # elif defined(SIGMAX)
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| 30 | # define NSIG (SIGMAX + 1) /* For djgpp */
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| 31 | # else
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| 32 | # define NSIG 64 /* Use a reasonable default value */
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| 33 | # endif
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| 34 | #endif
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| 35 |
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| 36 |
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| 37 | /*
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| 38 | NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS
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| 39 |
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| 40 | When threads are supported, we want the following semantics:
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| 41 |
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| 42 | - only the main thread can set a signal handler
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| 43 | - any thread can get a signal handler
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| 44 | - signals are only delivered to the main thread
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| 45 |
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| 46 | I.e. we don't support "synchronous signals" like SIGFPE (catching
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| 47 | this doesn't make much sense in Python anyway) nor do we support
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| 48 | signals as a means of inter-thread communication, since not all
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| 49 | thread implementations support that (at least our thread library
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| 50 | doesn't).
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| 51 |
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| 52 | We still have the problem that in some implementations signals
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| 53 | generated by the keyboard (e.g. SIGINT) are delivered to all
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| 54 | threads (e.g. SGI), while in others (e.g. Solaris) such signals are
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| 55 | delivered to one random thread (an intermediate possibility would
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| 56 | be to deliver it to the main thread -- POSIX?). For now, we have
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| 57 | a working implementation that works in all three cases -- the
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| 58 | handler ignores signals if getpid() isn't the same as in the main
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| 59 | thread. XXX This is a hack.
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| 60 |
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| 61 | GNU pth is a user-space threading library, and as such, all threads
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| 62 | run within the same process. In this case, if the currently running
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| 63 | thread is not the main_thread, send the signal to the main_thread.
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| 64 | */
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| 65 |
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| 66 | #ifdef WITH_THREAD
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| 67 | #include <sys/types.h> /* For pid_t */
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| 68 | #include "pythread.h"
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| 69 | static long main_thread;
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| 70 | static pid_t main_pid;
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| 71 | #endif
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| 72 |
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| 73 | static struct {
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| 74 | int tripped;
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| 75 | PyObject *func;
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| 76 | } Handlers[NSIG];
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| 77 |
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| 78 | static int is_tripped = 0; /* Speed up sigcheck() when none tripped */
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| 79 |
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| 80 | static PyObject *DefaultHandler;
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| 81 | static PyObject *IgnoreHandler;
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| 82 | static PyObject *IntHandler;
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| 83 |
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| 84 | /* On Solaris 8, gcc will produce a warning that the function
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| 85 | declaration is not a prototype. This is caused by the definition of
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| 86 | SIG_DFL as (void (*)())0; the correct declaration would have been
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| 87 | (void (*)(int))0. */
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| 88 |
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| 89 | static PyOS_sighandler_t old_siginthandler = SIG_DFL;
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| 90 |
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| 91 |
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| 92 | static PyObject *
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| 93 | signal_default_int_handler(PyObject *self, PyObject *args)
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| 94 | {
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| 95 | PyErr_SetNone(PyExc_KeyboardInterrupt);
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| 96 | return NULL;
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| 97 | }
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| 98 |
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| 99 | PyDoc_STRVAR(default_int_handler_doc,
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| 100 | "default_int_handler(...)\n\
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| 101 | \n\
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| 102 | The default handler for SIGINT installed by Python.\n\
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| 103 | It raises KeyboardInterrupt.");
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| 104 |
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| 105 |
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| 106 | static int
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| 107 | checksignals_witharg(void * unused)
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| 108 | {
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| 109 | return PyErr_CheckSignals();
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| 110 | }
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| 111 |
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| 112 | static void
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| 113 | signal_handler(int sig_num)
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| 114 | {
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| 115 | #ifdef WITH_THREAD
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| 116 | #ifdef WITH_PTH
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| 117 | if (PyThread_get_thread_ident() != main_thread) {
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| 118 | pth_raise(*(pth_t *) main_thread, sig_num);
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| 119 | return;
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| 120 | }
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| 121 | #endif
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| 122 | /* See NOTES section above */
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| 123 | if (getpid() == main_pid) {
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| 124 | #endif
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| 125 | is_tripped++;
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| 126 | Handlers[sig_num].tripped = 1;
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| 127 | Py_AddPendingCall(checksignals_witharg, NULL);
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| 128 | #ifdef WITH_THREAD
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| 129 | }
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| 130 | #endif
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| 131 | #ifdef SIGCHLD
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| 132 | if (sig_num == SIGCHLD) {
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| 133 | /* To avoid infinite recursion, this signal remains
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| 134 | reset until explicit re-instated.
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| 135 | Don't clear the 'func' field as it is our pointer
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| 136 | to the Python handler... */
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| 137 | return;
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| 138 | }
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| 139 | #endif
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| 140 | PyOS_setsig(sig_num, signal_handler);
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| 141 | }
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| 142 |
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| 143 |
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| 144 | #ifdef HAVE_ALARM
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| 145 | static PyObject *
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| 146 | signal_alarm(PyObject *self, PyObject *args)
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| 147 | {
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| 148 | int t;
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| 149 | if (!PyArg_ParseTuple(args, "i:alarm", &t))
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| 150 | return NULL;
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| 151 | /* alarm() returns the number of seconds remaining */
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| 152 | return PyInt_FromLong((long)alarm(t));
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| 153 | }
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| 154 |
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| 155 | PyDoc_STRVAR(alarm_doc,
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| 156 | "alarm(seconds)\n\
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| 157 | \n\
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| 158 | Arrange for SIGALRM to arrive after the given number of seconds.");
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| 159 | #endif
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| 160 |
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| 161 | #ifdef HAVE_PAUSE
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| 162 | static PyObject *
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| 163 | signal_pause(PyObject *self)
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| 164 | {
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| 165 | Py_BEGIN_ALLOW_THREADS
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| 166 | (void)pause();
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| 167 | Py_END_ALLOW_THREADS
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| 168 | /* make sure that any exceptions that got raised are propagated
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| 169 | * back into Python
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| 170 | */
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| 171 | if (PyErr_CheckSignals())
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| 172 | return NULL;
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| 173 |
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| 174 | Py_INCREF(Py_None);
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| 175 | return Py_None;
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| 176 | }
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| 177 | PyDoc_STRVAR(pause_doc,
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| 178 | "pause()\n\
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| 179 | \n\
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| 180 | Wait until a signal arrives.");
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| 181 |
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| 182 | #endif
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| 183 |
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| 184 |
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| 185 | static PyObject *
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| 186 | signal_signal(PyObject *self, PyObject *args)
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| 187 | {
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| 188 | PyObject *obj;
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| 189 | int sig_num;
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| 190 | PyObject *old_handler;
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| 191 | void (*func)(int);
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| 192 | if (!PyArg_ParseTuple(args, "iO:signal", &sig_num, &obj))
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| 193 | return NULL;
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| 194 | #ifdef WITH_THREAD
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| 195 | if (PyThread_get_thread_ident() != main_thread) {
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| 196 | PyErr_SetString(PyExc_ValueError,
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| 197 | "signal only works in main thread");
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| 198 | return NULL;
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| 199 | }
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| 200 | #endif
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| 201 | if (sig_num < 1 || sig_num >= NSIG) {
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| 202 | PyErr_SetString(PyExc_ValueError,
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| 203 | "signal number out of range");
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| 204 | return NULL;
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| 205 | }
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| 206 | if (obj == IgnoreHandler)
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| 207 | func = SIG_IGN;
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| 208 | else if (obj == DefaultHandler)
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| 209 | func = SIG_DFL;
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| 210 | else if (!PyCallable_Check(obj)) {
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| 211 | PyErr_SetString(PyExc_TypeError,
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| 212 | "signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object");
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| 213 | return NULL;
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| 214 | }
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| 215 | else
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| 216 | func = signal_handler;
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| 217 | if (PyOS_setsig(sig_num, func) == SIG_ERR) {
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| 218 | PyErr_SetFromErrno(PyExc_RuntimeError);
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| 219 | return NULL;
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| 220 | }
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| 221 | old_handler = Handlers[sig_num].func;
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| 222 | Handlers[sig_num].tripped = 0;
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| 223 | Py_INCREF(obj);
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| 224 | Handlers[sig_num].func = obj;
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| 225 | return old_handler;
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| 226 | }
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| 227 |
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| 228 | PyDoc_STRVAR(signal_doc,
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| 229 | "signal(sig, action) -> action\n\
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| 230 | \n\
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| 231 | Set the action for the given signal. The action can be SIG_DFL,\n\
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| 232 | SIG_IGN, or a callable Python object. The previous action is\n\
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| 233 | returned. See getsignal() for possible return values.\n\
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| 234 | \n\
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| 235 | *** IMPORTANT NOTICE ***\n\
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| 236 | A signal handler function is called with two arguments:\n\
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| 237 | the first is the signal number, the second is the interrupted stack frame.");
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| 238 |
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| 239 |
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| 240 | static PyObject *
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| 241 | signal_getsignal(PyObject *self, PyObject *args)
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| 242 | {
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| 243 | int sig_num;
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| 244 | PyObject *old_handler;
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| 245 | if (!PyArg_ParseTuple(args, "i:getsignal", &sig_num))
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| 246 | return NULL;
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| 247 | if (sig_num < 1 || sig_num >= NSIG) {
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| 248 | PyErr_SetString(PyExc_ValueError,
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| 249 | "signal number out of range");
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| 250 | return NULL;
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| 251 | }
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| 252 | old_handler = Handlers[sig_num].func;
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| 253 | Py_INCREF(old_handler);
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| 254 | return old_handler;
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| 255 | }
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| 256 |
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| 257 | PyDoc_STRVAR(getsignal_doc,
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| 258 | "getsignal(sig) -> action\n\
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| 259 | \n\
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| 260 | Return the current action for the given signal. The return value can be:\n\
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| 261 | SIG_IGN -- if the signal is being ignored\n\
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| 262 | SIG_DFL -- if the default action for the signal is in effect\n\
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| 263 | None -- if an unknown handler is in effect\n\
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| 264 | anything else -- the callable Python object used as a handler");
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| 265 |
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| 266 |
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| 267 | /* List of functions defined in the module */
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| 268 | static PyMethodDef signal_methods[] = {
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| 269 | #ifdef HAVE_ALARM
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| 270 | {"alarm", signal_alarm, METH_VARARGS, alarm_doc},
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| 271 | #endif
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| 272 | {"signal", signal_signal, METH_VARARGS, signal_doc},
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| 273 | {"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc},
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| 274 | #ifdef HAVE_PAUSE
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| 275 | {"pause", (PyCFunction)signal_pause,
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| 276 | METH_NOARGS,pause_doc},
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| 277 | #endif
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| 278 | {"default_int_handler", signal_default_int_handler,
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| 279 | METH_VARARGS, default_int_handler_doc},
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| 280 | {NULL, NULL} /* sentinel */
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| 281 | };
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| 282 |
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| 283 |
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| 284 | PyDoc_STRVAR(module_doc,
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| 285 | "This module provides mechanisms to use signal handlers in Python.\n\
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| 286 | \n\
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| 287 | Functions:\n\
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| 288 | \n\
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| 289 | alarm() -- cause SIGALRM after a specified time [Unix only]\n\
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| 290 | signal() -- set the action for a given signal\n\
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| 291 | getsignal() -- get the signal action for a given signal\n\
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| 292 | pause() -- wait until a signal arrives [Unix only]\n\
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| 293 | default_int_handler() -- default SIGINT handler\n\
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| 294 | \n\
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| 295 | Constants:\n\
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| 296 | \n\
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| 297 | SIG_DFL -- used to refer to the system default handler\n\
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| 298 | SIG_IGN -- used to ignore the signal\n\
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| 299 | NSIG -- number of defined signals\n\
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| 300 | \n\
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| 301 | SIGINT, SIGTERM, etc. -- signal numbers\n\
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| 302 | \n\
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| 303 | *** IMPORTANT NOTICE ***\n\
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| 304 | A signal handler function is called with two arguments:\n\
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| 305 | the first is the signal number, the second is the interrupted stack frame.");
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| 306 |
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| 307 | PyMODINIT_FUNC
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| 308 | initsignal(void)
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| 309 | {
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| 310 | PyObject *m, *d, *x;
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| 311 | int i;
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| 312 |
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| 313 | #ifdef WITH_THREAD
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| 314 | main_thread = PyThread_get_thread_ident();
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| 315 | main_pid = getpid();
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| 316 | #endif
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| 317 |
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| 318 | /* Create the module and add the functions */
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| 319 | m = Py_InitModule3("signal", signal_methods, module_doc);
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| 320 | if (m == NULL)
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| 321 | return;
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| 322 |
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| 323 | /* Add some symbolic constants to the module */
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| 324 | d = PyModule_GetDict(m);
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| 325 |
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| 326 | x = DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL);
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| 327 | if (!x || PyDict_SetItemString(d, "SIG_DFL", x) < 0)
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| 328 | goto finally;
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| 329 |
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| 330 | x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN);
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| 331 | if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0)
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| 332 | goto finally;
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| 333 |
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| 334 | x = PyInt_FromLong((long)NSIG);
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| 335 | if (!x || PyDict_SetItemString(d, "NSIG", x) < 0)
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| 336 | goto finally;
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| 337 | Py_DECREF(x);
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| 338 |
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| 339 | x = IntHandler = PyDict_GetItemString(d, "default_int_handler");
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| 340 | if (!x)
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| 341 | goto finally;
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| 342 | Py_INCREF(IntHandler);
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| 343 |
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| 344 | Handlers[0].tripped = 0;
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| 345 | for (i = 1; i < NSIG; i++) {
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| 346 | void (*t)(int);
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| 347 | t = PyOS_getsig(i);
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| 348 | Handlers[i].tripped = 0;
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| 349 | if (t == SIG_DFL)
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| 350 | Handlers[i].func = DefaultHandler;
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| 351 | else if (t == SIG_IGN)
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| 352 | Handlers[i].func = IgnoreHandler;
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| 353 | else
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| 354 | Handlers[i].func = Py_None; /* None of our business */
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| 355 | Py_INCREF(Handlers[i].func);
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| 356 | }
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| 357 | if (Handlers[SIGINT].func == DefaultHandler) {
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| 358 | /* Install default int handler */
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| 359 | Py_INCREF(IntHandler);
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| 360 | Py_DECREF(Handlers[SIGINT].func);
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| 361 | Handlers[SIGINT].func = IntHandler;
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| 362 | old_siginthandler = PyOS_setsig(SIGINT, signal_handler);
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| 363 | }
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| 364 |
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| 365 | #ifdef SIGHUP
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| 366 | x = PyInt_FromLong(SIGHUP);
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| 367 | PyDict_SetItemString(d, "SIGHUP", x);
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| 368 | Py_XDECREF(x);
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| 369 | #endif
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| 370 | #ifdef SIGINT
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| 371 | x = PyInt_FromLong(SIGINT);
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| 372 | PyDict_SetItemString(d, "SIGINT", x);
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| 373 | Py_XDECREF(x);
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| 374 | #endif
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| 375 | #ifdef SIGBREAK
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| 376 | x = PyInt_FromLong(SIGBREAK);
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| 377 | PyDict_SetItemString(d, "SIGBREAK", x);
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| 378 | Py_XDECREF(x);
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| 379 | #endif
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| 380 | #ifdef SIGQUIT
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| 381 | x = PyInt_FromLong(SIGQUIT);
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| 382 | PyDict_SetItemString(d, "SIGQUIT", x);
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| 383 | Py_XDECREF(x);
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| 384 | #endif
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| 385 | #ifdef SIGILL
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| 386 | x = PyInt_FromLong(SIGILL);
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| 387 | PyDict_SetItemString(d, "SIGILL", x);
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| 388 | Py_XDECREF(x);
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| 389 | #endif
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| 390 | #ifdef SIGTRAP
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| 391 | x = PyInt_FromLong(SIGTRAP);
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| 392 | PyDict_SetItemString(d, "SIGTRAP", x);
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| 393 | Py_XDECREF(x);
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| 394 | #endif
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| 395 | #ifdef SIGIOT
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| 396 | x = PyInt_FromLong(SIGIOT);
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| 397 | PyDict_SetItemString(d, "SIGIOT", x);
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| 398 | Py_XDECREF(x);
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| 399 | #endif
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| 400 | #ifdef SIGABRT
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| 401 | x = PyInt_FromLong(SIGABRT);
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| 402 | PyDict_SetItemString(d, "SIGABRT", x);
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| 403 | Py_XDECREF(x);
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| 404 | #endif
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| 405 | #ifdef SIGEMT
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| 406 | x = PyInt_FromLong(SIGEMT);
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| 407 | PyDict_SetItemString(d, "SIGEMT", x);
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| 408 | Py_XDECREF(x);
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| 409 | #endif
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| 410 | #ifdef SIGFPE
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| 411 | x = PyInt_FromLong(SIGFPE);
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| 412 | PyDict_SetItemString(d, "SIGFPE", x);
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| 413 | Py_XDECREF(x);
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| 414 | #endif
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| 415 | #ifdef SIGKILL
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| 416 | x = PyInt_FromLong(SIGKILL);
|
|---|
| 417 | PyDict_SetItemString(d, "SIGKILL", x);
|
|---|
| 418 | Py_XDECREF(x);
|
|---|
| 419 | #endif
|
|---|
| 420 | #ifdef SIGBUS
|
|---|
| 421 | x = PyInt_FromLong(SIGBUS);
|
|---|
| 422 | PyDict_SetItemString(d, "SIGBUS", x);
|
|---|
| 423 | Py_XDECREF(x);
|
|---|
| 424 | #endif
|
|---|
| 425 | #ifdef SIGSEGV
|
|---|
| 426 | x = PyInt_FromLong(SIGSEGV);
|
|---|
| 427 | PyDict_SetItemString(d, "SIGSEGV", x);
|
|---|
| 428 | Py_XDECREF(x);
|
|---|
| 429 | #endif
|
|---|
| 430 | #ifdef SIGSYS
|
|---|
| 431 | x = PyInt_FromLong(SIGSYS);
|
|---|
| 432 | PyDict_SetItemString(d, "SIGSYS", x);
|
|---|
| 433 | Py_XDECREF(x);
|
|---|
| 434 | #endif
|
|---|
| 435 | #ifdef SIGPIPE
|
|---|
| 436 | x = PyInt_FromLong(SIGPIPE);
|
|---|
| 437 | PyDict_SetItemString(d, "SIGPIPE", x);
|
|---|
| 438 | Py_XDECREF(x);
|
|---|
| 439 | #endif
|
|---|
| 440 | #ifdef SIGALRM
|
|---|
| 441 | x = PyInt_FromLong(SIGALRM);
|
|---|
| 442 | PyDict_SetItemString(d, "SIGALRM", x);
|
|---|
| 443 | Py_XDECREF(x);
|
|---|
| 444 | #endif
|
|---|
| 445 | #ifdef SIGTERM
|
|---|
| 446 | x = PyInt_FromLong(SIGTERM);
|
|---|
| 447 | PyDict_SetItemString(d, "SIGTERM", x);
|
|---|
| 448 | Py_XDECREF(x);
|
|---|
| 449 | #endif
|
|---|
| 450 | #ifdef SIGUSR1
|
|---|
| 451 | x = PyInt_FromLong(SIGUSR1);
|
|---|
| 452 | PyDict_SetItemString(d, "SIGUSR1", x);
|
|---|
| 453 | Py_XDECREF(x);
|
|---|
| 454 | #endif
|
|---|
| 455 | #ifdef SIGUSR2
|
|---|
| 456 | x = PyInt_FromLong(SIGUSR2);
|
|---|
| 457 | PyDict_SetItemString(d, "SIGUSR2", x);
|
|---|
| 458 | Py_XDECREF(x);
|
|---|
| 459 | #endif
|
|---|
| 460 | #ifdef SIGCLD
|
|---|
| 461 | x = PyInt_FromLong(SIGCLD);
|
|---|
| 462 | PyDict_SetItemString(d, "SIGCLD", x);
|
|---|
| 463 | Py_XDECREF(x);
|
|---|
| 464 | #endif
|
|---|
| 465 | #ifdef SIGCHLD
|
|---|
| 466 | x = PyInt_FromLong(SIGCHLD);
|
|---|
| 467 | PyDict_SetItemString(d, "SIGCHLD", x);
|
|---|
| 468 | Py_XDECREF(x);
|
|---|
| 469 | #endif
|
|---|
| 470 | #ifdef SIGPWR
|
|---|
| 471 | x = PyInt_FromLong(SIGPWR);
|
|---|
| 472 | PyDict_SetItemString(d, "SIGPWR", x);
|
|---|
| 473 | Py_XDECREF(x);
|
|---|
| 474 | #endif
|
|---|
| 475 | #ifdef SIGIO
|
|---|
| 476 | x = PyInt_FromLong(SIGIO);
|
|---|
| 477 | PyDict_SetItemString(d, "SIGIO", x);
|
|---|
| 478 | Py_XDECREF(x);
|
|---|
| 479 | #endif
|
|---|
| 480 | #ifdef SIGURG
|
|---|
| 481 | x = PyInt_FromLong(SIGURG);
|
|---|
| 482 | PyDict_SetItemString(d, "SIGURG", x);
|
|---|
| 483 | Py_XDECREF(x);
|
|---|
| 484 | #endif
|
|---|
| 485 | #ifdef SIGWINCH
|
|---|
| 486 | x = PyInt_FromLong(SIGWINCH);
|
|---|
| 487 | PyDict_SetItemString(d, "SIGWINCH", x);
|
|---|
| 488 | Py_XDECREF(x);
|
|---|
| 489 | #endif
|
|---|
| 490 | #ifdef SIGPOLL
|
|---|
| 491 | x = PyInt_FromLong(SIGPOLL);
|
|---|
| 492 | PyDict_SetItemString(d, "SIGPOLL", x);
|
|---|
| 493 | Py_XDECREF(x);
|
|---|
| 494 | #endif
|
|---|
| 495 | #ifdef SIGSTOP
|
|---|
| 496 | x = PyInt_FromLong(SIGSTOP);
|
|---|
| 497 | PyDict_SetItemString(d, "SIGSTOP", x);
|
|---|
| 498 | Py_XDECREF(x);
|
|---|
| 499 | #endif
|
|---|
| 500 | #ifdef SIGTSTP
|
|---|
| 501 | x = PyInt_FromLong(SIGTSTP);
|
|---|
| 502 | PyDict_SetItemString(d, "SIGTSTP", x);
|
|---|
| 503 | Py_XDECREF(x);
|
|---|
| 504 | #endif
|
|---|
| 505 | #ifdef SIGCONT
|
|---|
| 506 | x = PyInt_FromLong(SIGCONT);
|
|---|
| 507 | PyDict_SetItemString(d, "SIGCONT", x);
|
|---|
| 508 | Py_XDECREF(x);
|
|---|
| 509 | #endif
|
|---|
| 510 | #ifdef SIGTTIN
|
|---|
| 511 | x = PyInt_FromLong(SIGTTIN);
|
|---|
| 512 | PyDict_SetItemString(d, "SIGTTIN", x);
|
|---|
| 513 | Py_XDECREF(x);
|
|---|
| 514 | #endif
|
|---|
| 515 | #ifdef SIGTTOU
|
|---|
| 516 | x = PyInt_FromLong(SIGTTOU);
|
|---|
| 517 | PyDict_SetItemString(d, "SIGTTOU", x);
|
|---|
| 518 | Py_XDECREF(x);
|
|---|
| 519 | #endif
|
|---|
| 520 | #ifdef SIGVTALRM
|
|---|
| 521 | x = PyInt_FromLong(SIGVTALRM);
|
|---|
| 522 | PyDict_SetItemString(d, "SIGVTALRM", x);
|
|---|
| 523 | Py_XDECREF(x);
|
|---|
| 524 | #endif
|
|---|
| 525 | #ifdef SIGPROF
|
|---|
| 526 | x = PyInt_FromLong(SIGPROF);
|
|---|
| 527 | PyDict_SetItemString(d, "SIGPROF", x);
|
|---|
| 528 | Py_XDECREF(x);
|
|---|
| 529 | #endif
|
|---|
| 530 | #ifdef SIGXCPU
|
|---|
| 531 | x = PyInt_FromLong(SIGXCPU);
|
|---|
| 532 | PyDict_SetItemString(d, "SIGXCPU", x);
|
|---|
| 533 | Py_XDECREF(x);
|
|---|
| 534 | #endif
|
|---|
| 535 | #ifdef SIGXFSZ
|
|---|
| 536 | x = PyInt_FromLong(SIGXFSZ);
|
|---|
| 537 | PyDict_SetItemString(d, "SIGXFSZ", x);
|
|---|
| 538 | Py_XDECREF(x);
|
|---|
| 539 | #endif
|
|---|
| 540 | #ifdef SIGRTMIN
|
|---|
| 541 | x = PyInt_FromLong(SIGRTMIN);
|
|---|
| 542 | PyDict_SetItemString(d, "SIGRTMIN", x);
|
|---|
| 543 | Py_XDECREF(x);
|
|---|
| 544 | #endif
|
|---|
| 545 | #ifdef SIGRTMAX
|
|---|
| 546 | x = PyInt_FromLong(SIGRTMAX);
|
|---|
| 547 | PyDict_SetItemString(d, "SIGRTMAX", x);
|
|---|
| 548 | Py_XDECREF(x);
|
|---|
| 549 | #endif
|
|---|
| 550 | #ifdef SIGINFO
|
|---|
| 551 | x = PyInt_FromLong(SIGINFO);
|
|---|
| 552 | PyDict_SetItemString(d, "SIGINFO", x);
|
|---|
| 553 | Py_XDECREF(x);
|
|---|
| 554 | #endif
|
|---|
| 555 | if (!PyErr_Occurred())
|
|---|
| 556 | return;
|
|---|
| 557 |
|
|---|
| 558 | /* Check for errors */
|
|---|
| 559 | finally:
|
|---|
| 560 | return;
|
|---|
| 561 | }
|
|---|
| 562 |
|
|---|
| 563 | static void
|
|---|
| 564 | finisignal(void)
|
|---|
| 565 | {
|
|---|
| 566 | int i;
|
|---|
| 567 | PyObject *func;
|
|---|
| 568 |
|
|---|
| 569 | PyOS_setsig(SIGINT, old_siginthandler);
|
|---|
| 570 | old_siginthandler = SIG_DFL;
|
|---|
| 571 |
|
|---|
| 572 | for (i = 1; i < NSIG; i++) {
|
|---|
| 573 | func = Handlers[i].func;
|
|---|
| 574 | Handlers[i].tripped = 0;
|
|---|
| 575 | Handlers[i].func = NULL;
|
|---|
| 576 | if (i != SIGINT && func != NULL && func != Py_None &&
|
|---|
| 577 | func != DefaultHandler && func != IgnoreHandler)
|
|---|
| 578 | PyOS_setsig(i, SIG_DFL);
|
|---|
| 579 | Py_XDECREF(func);
|
|---|
| 580 | }
|
|---|
| 581 |
|
|---|
| 582 | Py_XDECREF(IntHandler);
|
|---|
| 583 | IntHandler = NULL;
|
|---|
| 584 | Py_XDECREF(DefaultHandler);
|
|---|
| 585 | DefaultHandler = NULL;
|
|---|
| 586 | Py_XDECREF(IgnoreHandler);
|
|---|
| 587 | IgnoreHandler = NULL;
|
|---|
| 588 | }
|
|---|
| 589 |
|
|---|
| 590 |
|
|---|
| 591 | /* Declared in pyerrors.h */
|
|---|
| 592 | int
|
|---|
| 593 | PyErr_CheckSignals(void)
|
|---|
| 594 | {
|
|---|
| 595 | int i;
|
|---|
| 596 | PyObject *f;
|
|---|
| 597 |
|
|---|
| 598 | if (!is_tripped)
|
|---|
| 599 | return 0;
|
|---|
| 600 | #ifdef WITH_THREAD
|
|---|
| 601 | if (PyThread_get_thread_ident() != main_thread)
|
|---|
| 602 | return 0;
|
|---|
| 603 | #endif
|
|---|
| 604 | if (!(f = (PyObject *)PyEval_GetFrame()))
|
|---|
| 605 | f = Py_None;
|
|---|
| 606 |
|
|---|
| 607 | for (i = 1; i < NSIG; i++) {
|
|---|
| 608 | if (Handlers[i].tripped) {
|
|---|
| 609 | PyObject *result = NULL;
|
|---|
| 610 | PyObject *arglist = Py_BuildValue("(iO)", i, f);
|
|---|
| 611 | Handlers[i].tripped = 0;
|
|---|
| 612 |
|
|---|
| 613 | if (arglist) {
|
|---|
| 614 | result = PyEval_CallObject(Handlers[i].func,
|
|---|
| 615 | arglist);
|
|---|
| 616 | Py_DECREF(arglist);
|
|---|
| 617 | }
|
|---|
| 618 | if (!result)
|
|---|
| 619 | return -1;
|
|---|
| 620 |
|
|---|
| 621 | Py_DECREF(result);
|
|---|
| 622 | }
|
|---|
| 623 | }
|
|---|
| 624 | is_tripped = 0;
|
|---|
| 625 | return 0;
|
|---|
| 626 | }
|
|---|
| 627 |
|
|---|
| 628 |
|
|---|
| 629 | /* Replacements for intrcheck.c functionality
|
|---|
| 630 | * Declared in pyerrors.h
|
|---|
| 631 | */
|
|---|
| 632 | void
|
|---|
| 633 | PyErr_SetInterrupt(void)
|
|---|
| 634 | {
|
|---|
| 635 | is_tripped++;
|
|---|
| 636 | Handlers[SIGINT].tripped = 1;
|
|---|
| 637 | Py_AddPendingCall((int (*)(void *))PyErr_CheckSignals, NULL);
|
|---|
| 638 | }
|
|---|
| 639 |
|
|---|
| 640 | void
|
|---|
| 641 | PyOS_InitInterrupts(void)
|
|---|
| 642 | {
|
|---|
| 643 | initsignal();
|
|---|
| 644 | _PyImport_FixupExtension("signal", "signal");
|
|---|
| 645 | }
|
|---|
| 646 |
|
|---|
| 647 | void
|
|---|
| 648 | PyOS_FiniInterrupts(void)
|
|---|
| 649 | {
|
|---|
| 650 | finisignal();
|
|---|
| 651 | }
|
|---|
| 652 |
|
|---|
| 653 | int
|
|---|
| 654 | PyOS_InterruptOccurred(void)
|
|---|
| 655 | {
|
|---|
| 656 | if (Handlers[SIGINT].tripped) {
|
|---|
| 657 | #ifdef WITH_THREAD
|
|---|
| 658 | if (PyThread_get_thread_ident() != main_thread)
|
|---|
| 659 | return 0;
|
|---|
| 660 | #endif
|
|---|
| 661 | Handlers[SIGINT].tripped = 0;
|
|---|
| 662 | return 1;
|
|---|
| 663 | }
|
|---|
| 664 | return 0;
|
|---|
| 665 | }
|
|---|
| 666 |
|
|---|
| 667 | void
|
|---|
| 668 | PyOS_AfterFork(void)
|
|---|
| 669 | {
|
|---|
| 670 | #ifdef WITH_THREAD
|
|---|
| 671 | PyEval_ReInitThreads();
|
|---|
| 672 | main_thread = PyThread_get_thread_ident();
|
|---|
| 673 | main_pid = getpid();
|
|---|
| 674 | _PyImport_ReInitLock();
|
|---|
| 675 | #endif
|
|---|
| 676 | }
|
|---|
