Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1 | |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 2 | /* Signal module -- many thanks to Lance Ellinghaus */ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 3 | |
Guido van Rossum | 644a12b | 1997-04-09 19:24:53 +0000 | [diff] [blame] | 4 | /* XXX Signals should be recorded per thread, now we have thread state. */ |
| 5 | |
Guido van Rossum | 602099a | 1994-09-14 13:32:22 +0000 | [diff] [blame] | 6 | #include "Python.h" |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 7 | #include "intrcheck.h" |
| 8 | |
Martin v. Löwis | 6238d2b | 2002-06-30 15:26:10 +0000 | [diff] [blame] | 9 | #ifdef MS_WINDOWS |
Guido van Rossum | 644a12b | 1997-04-09 19:24:53 +0000 | [diff] [blame] | 10 | #include <process.h> |
| 11 | #endif |
| 12 | |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 13 | #include <signal.h> |
| 14 | |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 15 | #ifndef SIG_ERR |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 16 | #define SIG_ERR ((PyOS_sighandler_t)(-1)) |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 17 | #endif |
| 18 | |
Andrew MacIntyre | 7bf6833 | 2002-03-03 02:59:16 +0000 | [diff] [blame] | 19 | #if defined(PYOS_OS2) && !defined(PYCC_GCC) |
Guido van Rossum | 8e9ebfd | 1997-11-22 21:53:48 +0000 | [diff] [blame] | 20 | #define NSIG 12 |
| 21 | #include <process.h> |
| 22 | #endif |
| 23 | |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 24 | #ifndef NSIG |
Marc-André Lemburg | 8bcfb8a | 2000-07-04 14:17:33 +0000 | [diff] [blame] | 25 | # if defined(_NSIG) |
| 26 | # define NSIG _NSIG /* For BSD/SysV */ |
| 27 | # elif defined(_SIGMAX) |
| 28 | # define NSIG (_SIGMAX + 1) /* For QNX */ |
| 29 | # elif defined(SIGMAX) |
| 30 | # define NSIG (SIGMAX + 1) /* For djgpp */ |
| 31 | # else |
| 32 | # define NSIG 64 /* Use a reasonable default value */ |
| 33 | # endif |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 34 | #endif |
| 35 | |
| 36 | |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 37 | /* |
| 38 | NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS |
| 39 | |
| 40 | When threads are supported, we want the following semantics: |
| 41 | |
| 42 | - only the main thread can set a signal handler |
| 43 | - any thread can get a signal handler |
| 44 | - signals are only delivered to the main thread |
| 45 | |
| 46 | I.e. we don't support "synchronous signals" like SIGFPE (catching |
| 47 | this doesn't make much sense in Python anyway) nor do we support |
| 48 | signals as a means of inter-thread communication, since not all |
| 49 | thread implementations support that (at least our thread library |
| 50 | doesn't). |
| 51 | |
| 52 | We still have the problem that in some implementations signals |
| 53 | generated by the keyboard (e.g. SIGINT) are delivered to all |
| 54 | threads (e.g. SGI), while in others (e.g. Solaris) such signals are |
| 55 | delivered to one random thread (an intermediate possibility would |
Guido van Rossum | a3c04b0 | 1995-01-12 11:29:01 +0000 | [diff] [blame] | 56 | be to deliver it to the main thread -- POSIX?). For now, we have |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 57 | a working implementation that works in all three cases -- the |
| 58 | handler ignores signals if getpid() isn't the same as in the main |
| 59 | thread. XXX This is a hack. |
| 60 | |
Guido van Rossum | 9e8181b | 2000-09-19 00:46:46 +0000 | [diff] [blame] | 61 | GNU pth is a user-space threading library, and as such, all threads |
| 62 | run within the same process. In this case, if the currently running |
| 63 | thread is not the main_thread, send the signal to the main_thread. |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 64 | */ |
| 65 | |
| 66 | #ifdef WITH_THREAD |
Guido van Rossum | 295b8e5 | 1997-06-06 21:16:41 +0000 | [diff] [blame] | 67 | #include <sys/types.h> /* For pid_t */ |
Guido van Rossum | 49b5606 | 1998-10-01 20:42:43 +0000 | [diff] [blame] | 68 | #include "pythread.h" |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 69 | static long main_thread; |
| 70 | static pid_t main_pid; |
| 71 | #endif |
| 72 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 73 | static struct { |
| 74 | int tripped; |
| 75 | PyObject *func; |
| 76 | } Handlers[NSIG]; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 77 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 78 | static int is_tripped = 0; /* Speed up sigcheck() when none tripped */ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 79 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 80 | static PyObject *DefaultHandler; |
| 81 | static PyObject *IgnoreHandler; |
| 82 | static PyObject *IntHandler; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 83 | |
Martin v. Löwis | f58de1b | 2001-03-06 12:13:56 +0000 | [diff] [blame] | 84 | /* On Solaris 8, gcc will produce a warning that the function |
| 85 | declaration is not a prototype. This is caused by the definition of |
| 86 | SIG_DFL as (void (*)())0; the correct declaration would have been |
| 87 | (void (*)(int))0. */ |
| 88 | |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 89 | static PyOS_sighandler_t old_siginthandler = SIG_DFL; |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 90 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 91 | |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 92 | static PyObject * |
Peter Schneider-Kamp | e89b156 | 2000-07-10 12:04:18 +0000 | [diff] [blame] | 93 | signal_default_int_handler(PyObject *self, PyObject *args) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 94 | { |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 95 | PyErr_SetNone(PyExc_KeyboardInterrupt); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 96 | return NULL; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 97 | } |
| 98 | |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 99 | PyDoc_STRVAR(default_int_handler_doc, |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 100 | "default_int_handler(...)\n\ |
| 101 | \n\ |
Michael W. Hudson | 24ec211 | 2004-06-17 15:55:53 +0000 | [diff] [blame] | 102 | The default handler for SIGINT installed by Python.\n\ |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 103 | It raises KeyboardInterrupt."); |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 104 | |
Thomas Wouters | 0796b00 | 2000-07-22 23:49:30 +0000 | [diff] [blame] | 105 | |
| 106 | static int |
| 107 | checksignals_witharg(void * unused) |
| 108 | { |
| 109 | return PyErr_CheckSignals(); |
| 110 | } |
| 111 | |
Tim Peters | 4f1b208 | 2000-07-23 21:18:09 +0000 | [diff] [blame] | 112 | static void |
Peter Schneider-Kamp | e89b156 | 2000-07-10 12:04:18 +0000 | [diff] [blame] | 113 | signal_handler(int sig_num) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 114 | { |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 115 | #ifdef WITH_THREAD |
Guido van Rossum | 9e8181b | 2000-09-19 00:46:46 +0000 | [diff] [blame] | 116 | #ifdef WITH_PTH |
| 117 | if (PyThread_get_thread_ident() != main_thread) { |
| 118 | pth_raise(*(pth_t *) main_thread, sig_num); |
| 119 | return; |
| 120 | } |
| 121 | #endif |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 122 | /* See NOTES section above */ |
| 123 | if (getpid() == main_pid) { |
| 124 | #endif |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 125 | is_tripped++; |
| 126 | Handlers[sig_num].tripped = 1; |
Thomas Wouters | 0796b00 | 2000-07-22 23:49:30 +0000 | [diff] [blame] | 127 | Py_AddPendingCall(checksignals_witharg, NULL); |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 128 | #ifdef WITH_THREAD |
| 129 | } |
| 130 | #endif |
Guido van Rossum | 602099a | 1994-09-14 13:32:22 +0000 | [diff] [blame] | 131 | #ifdef SIGCHLD |
| 132 | if (sig_num == SIGCHLD) { |
| 133 | /* To avoid infinite recursion, this signal remains |
| 134 | reset until explicit re-instated. |
| 135 | Don't clear the 'func' field as it is our pointer |
| 136 | to the Python handler... */ |
Tim Peters | 4f1b208 | 2000-07-23 21:18:09 +0000 | [diff] [blame] | 137 | return; |
Guido van Rossum | 602099a | 1994-09-14 13:32:22 +0000 | [diff] [blame] | 138 | } |
| 139 | #endif |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 140 | PyOS_setsig(sig_num, signal_handler); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 141 | } |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 142 | |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 143 | |
Guido van Rossum | 1171ee6 | 1997-08-22 20:42:00 +0000 | [diff] [blame] | 144 | #ifdef HAVE_ALARM |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 145 | static PyObject * |
Peter Schneider-Kamp | e89b156 | 2000-07-10 12:04:18 +0000 | [diff] [blame] | 146 | signal_alarm(PyObject *self, PyObject *args) |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 147 | { |
| 148 | int t; |
Neal Norwitz | ba3a16c | 2002-03-31 15:27:00 +0000 | [diff] [blame] | 149 | if (!PyArg_ParseTuple(args, "i:alarm", &t)) |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 150 | return NULL; |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 151 | /* alarm() returns the number of seconds remaining */ |
Fred Drake | dff3a37 | 2001-07-19 21:29:49 +0000 | [diff] [blame] | 152 | return PyInt_FromLong((long)alarm(t)); |
Guido van Rossum | aa0f4c7 | 1994-08-23 13:49:37 +0000 | [diff] [blame] | 153 | } |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 154 | |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 155 | PyDoc_STRVAR(alarm_doc, |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 156 | "alarm(seconds)\n\ |
| 157 | \n\ |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 158 | Arrange for SIGALRM to arrive after the given number of seconds."); |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 159 | #endif |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 160 | |
Guido van Rossum | 1171ee6 | 1997-08-22 20:42:00 +0000 | [diff] [blame] | 161 | #ifdef HAVE_PAUSE |
Guido van Rossum | a597dde | 1995-01-10 20:56:29 +0000 | [diff] [blame] | 162 | static PyObject * |
Neal Norwitz | 3a6f978 | 2002-03-25 20:46:46 +0000 | [diff] [blame] | 163 | signal_pause(PyObject *self) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 164 | { |
Guido van Rossum | a597dde | 1995-01-10 20:56:29 +0000 | [diff] [blame] | 165 | Py_BEGIN_ALLOW_THREADS |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 166 | (void)pause(); |
Guido van Rossum | a597dde | 1995-01-10 20:56:29 +0000 | [diff] [blame] | 167 | Py_END_ALLOW_THREADS |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 168 | /* make sure that any exceptions that got raised are propagated |
| 169 | * back into Python |
| 170 | */ |
| 171 | if (PyErr_CheckSignals()) |
| 172 | return NULL; |
| 173 | |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 174 | Py_INCREF(Py_None); |
| 175 | return Py_None; |
| 176 | } |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 177 | PyDoc_STRVAR(pause_doc, |
Barry Warsaw | 1ee36ff | 1998-07-21 22:41:18 +0000 | [diff] [blame] | 178 | "pause()\n\ |
| 179 | \n\ |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 180 | Wait until a signal arrives."); |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 181 | |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 182 | #endif |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 183 | |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 184 | |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 185 | static PyObject * |
Peter Schneider-Kamp | e89b156 | 2000-07-10 12:04:18 +0000 | [diff] [blame] | 186 | signal_signal(PyObject *self, PyObject *args) |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 187 | { |
| 188 | PyObject *obj; |
| 189 | int sig_num; |
| 190 | PyObject *old_handler; |
Tim Peters | 4f1b208 | 2000-07-23 21:18:09 +0000 | [diff] [blame] | 191 | void (*func)(int); |
Neal Norwitz | ba3a16c | 2002-03-31 15:27:00 +0000 | [diff] [blame] | 192 | if (!PyArg_ParseTuple(args, "iO:signal", &sig_num, &obj)) |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 193 | return NULL; |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 194 | #ifdef WITH_THREAD |
Guido van Rossum | 65d5b57 | 1998-12-21 19:32:43 +0000 | [diff] [blame] | 195 | if (PyThread_get_thread_ident() != main_thread) { |
Guido van Rossum | f4b012a | 1995-03-16 15:43:29 +0000 | [diff] [blame] | 196 | PyErr_SetString(PyExc_ValueError, |
| 197 | "signal only works in main thread"); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 198 | return NULL; |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 199 | } |
| 200 | #endif |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 201 | if (sig_num < 1 || sig_num >= NSIG) { |
Guido van Rossum | f4b012a | 1995-03-16 15:43:29 +0000 | [diff] [blame] | 202 | PyErr_SetString(PyExc_ValueError, |
| 203 | "signal number out of range"); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 204 | return NULL; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 205 | } |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 206 | if (obj == IgnoreHandler) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 207 | func = SIG_IGN; |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 208 | else if (obj == DefaultHandler) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 209 | func = SIG_DFL; |
Guido van Rossum | f4b012a | 1995-03-16 15:43:29 +0000 | [diff] [blame] | 210 | else if (!PyCallable_Check(obj)) { |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 211 | PyErr_SetString(PyExc_TypeError, |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 212 | "signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object"); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 213 | return NULL; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 214 | } |
| 215 | else |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 216 | func = signal_handler; |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 217 | if (PyOS_setsig(sig_num, func) == SIG_ERR) { |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 218 | PyErr_SetFromErrno(PyExc_RuntimeError); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 219 | return NULL; |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 220 | } |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 221 | old_handler = Handlers[sig_num].func; |
| 222 | Handlers[sig_num].tripped = 0; |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 223 | Py_INCREF(obj); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 224 | Handlers[sig_num].func = obj; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 225 | return old_handler; |
| 226 | } |
| 227 | |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 228 | PyDoc_STRVAR(signal_doc, |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 229 | "signal(sig, action) -> action\n\ |
| 230 | \n\ |
| 231 | Set the action for the given signal. The action can be SIG_DFL,\n\ |
| 232 | SIG_IGN, or a callable Python object. The previous action is\n\ |
| 233 | returned. See getsignal() for possible return values.\n\ |
| 234 | \n\ |
| 235 | *** IMPORTANT NOTICE ***\n\ |
| 236 | A signal handler function is called with two arguments:\n\ |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 237 | the first is the signal number, the second is the interrupted stack frame."); |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 238 | |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 239 | |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 240 | static PyObject * |
Peter Schneider-Kamp | e89b156 | 2000-07-10 12:04:18 +0000 | [diff] [blame] | 241 | signal_getsignal(PyObject *self, PyObject *args) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 242 | { |
| 243 | int sig_num; |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 244 | PyObject *old_handler; |
Neal Norwitz | ba3a16c | 2002-03-31 15:27:00 +0000 | [diff] [blame] | 245 | if (!PyArg_ParseTuple(args, "i:getsignal", &sig_num)) |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 246 | return NULL; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 247 | if (sig_num < 1 || sig_num >= NSIG) { |
Guido van Rossum | f4b012a | 1995-03-16 15:43:29 +0000 | [diff] [blame] | 248 | PyErr_SetString(PyExc_ValueError, |
| 249 | "signal number out of range"); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 250 | return NULL; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 251 | } |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 252 | old_handler = Handlers[sig_num].func; |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 253 | Py_INCREF(old_handler); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 254 | return old_handler; |
| 255 | } |
| 256 | |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 257 | PyDoc_STRVAR(getsignal_doc, |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 258 | "getsignal(sig) -> action\n\ |
| 259 | \n\ |
| 260 | Return the current action for the given signal. The return value can be:\n\ |
| 261 | SIG_IGN -- if the signal is being ignored\n\ |
| 262 | SIG_DFL -- if the default action for the signal is in effect\n\ |
| 263 | None -- if an unknown handler is in effect\n\ |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 264 | anything else -- the callable Python object used as a handler"); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 265 | |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 266 | |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 267 | /* List of functions defined in the module */ |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 268 | static PyMethodDef signal_methods[] = { |
Guido van Rossum | 1171ee6 | 1997-08-22 20:42:00 +0000 | [diff] [blame] | 269 | #ifdef HAVE_ALARM |
Neal Norwitz | ba3a16c | 2002-03-31 15:27:00 +0000 | [diff] [blame] | 270 | {"alarm", signal_alarm, METH_VARARGS, alarm_doc}, |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 271 | #endif |
Neal Norwitz | ba3a16c | 2002-03-31 15:27:00 +0000 | [diff] [blame] | 272 | {"signal", signal_signal, METH_VARARGS, signal_doc}, |
| 273 | {"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc}, |
Guido van Rossum | 1171ee6 | 1997-08-22 20:42:00 +0000 | [diff] [blame] | 274 | #ifdef HAVE_PAUSE |
Neil Schemenauer | 78662cf | 2002-03-28 21:04:14 +0000 | [diff] [blame] | 275 | {"pause", (PyCFunction)signal_pause, |
| 276 | METH_NOARGS,pause_doc}, |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 277 | #endif |
Andrew M. Kuchling | a1abb72 | 2000-08-03 02:34:44 +0000 | [diff] [blame] | 278 | {"default_int_handler", signal_default_int_handler, |
Neal Norwitz | ba3a16c | 2002-03-31 15:27:00 +0000 | [diff] [blame] | 279 | METH_VARARGS, default_int_handler_doc}, |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 280 | {NULL, NULL} /* sentinel */ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 281 | }; |
| 282 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 283 | |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 284 | PyDoc_STRVAR(module_doc, |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 285 | "This module provides mechanisms to use signal handlers in Python.\n\ |
| 286 | \n\ |
| 287 | Functions:\n\ |
| 288 | \n\ |
| 289 | alarm() -- cause SIGALRM after a specified time [Unix only]\n\ |
| 290 | signal() -- set the action for a given signal\n\ |
| 291 | getsignal() -- get the signal action for a given signal\n\ |
| 292 | pause() -- wait until a signal arrives [Unix only]\n\ |
| 293 | default_int_handler() -- default SIGINT handler\n\ |
| 294 | \n\ |
| 295 | Constants:\n\ |
| 296 | \n\ |
| 297 | SIG_DFL -- used to refer to the system default handler\n\ |
| 298 | SIG_IGN -- used to ignore the signal\n\ |
| 299 | NSIG -- number of defined signals\n\ |
| 300 | \n\ |
| 301 | SIGINT, SIGTERM, etc. -- signal numbers\n\ |
| 302 | \n\ |
| 303 | *** IMPORTANT NOTICE ***\n\ |
| 304 | A signal handler function is called with two arguments:\n\ |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 305 | the first is the signal number, the second is the interrupted stack frame."); |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 306 | |
Mark Hammond | fe51c6d | 2002-08-02 02:27:13 +0000 | [diff] [blame] | 307 | PyMODINIT_FUNC |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 308 | initsignal(void) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 309 | { |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 310 | PyObject *m, *d, *x; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 311 | int i; |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 312 | |
| 313 | #ifdef WITH_THREAD |
Guido van Rossum | 65d5b57 | 1998-12-21 19:32:43 +0000 | [diff] [blame] | 314 | main_thread = PyThread_get_thread_ident(); |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 315 | main_pid = getpid(); |
| 316 | #endif |
| 317 | |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 318 | /* Create the module and add the functions */ |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 319 | m = Py_InitModule3("signal", signal_methods, module_doc); |
Neal Norwitz | 1ac754f | 2006-01-19 06:09:39 +0000 | [diff] [blame] | 320 | if (m == NULL) |
| 321 | return; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 322 | |
| 323 | /* Add some symbolic constants to the module */ |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 324 | d = PyModule_GetDict(m); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 325 | |
Guido van Rossum | 276fa43 | 2000-06-30 23:04:18 +0000 | [diff] [blame] | 326 | x = DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 327 | if (!x || PyDict_SetItemString(d, "SIG_DFL", x) < 0) |
| 328 | goto finally; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 329 | |
Guido van Rossum | 276fa43 | 2000-06-30 23:04:18 +0000 | [diff] [blame] | 330 | x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 331 | if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0) |
| 332 | goto finally; |
| 333 | |
| 334 | x = PyInt_FromLong((long)NSIG); |
| 335 | if (!x || PyDict_SetItemString(d, "NSIG", x) < 0) |
| 336 | goto finally; |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 337 | Py_DECREF(x); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 338 | |
| 339 | x = IntHandler = PyDict_GetItemString(d, "default_int_handler"); |
| 340 | if (!x) |
| 341 | goto finally; |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 342 | Py_INCREF(IntHandler); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 343 | |
| 344 | Handlers[0].tripped = 0; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 345 | for (i = 1; i < NSIG; i++) { |
Tim Peters | 4f1b208 | 2000-07-23 21:18:09 +0000 | [diff] [blame] | 346 | void (*t)(int); |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 347 | t = PyOS_getsig(i); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 348 | Handlers[i].tripped = 0; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 349 | if (t == SIG_DFL) |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 350 | Handlers[i].func = DefaultHandler; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 351 | else if (t == SIG_IGN) |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 352 | Handlers[i].func = IgnoreHandler; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 353 | else |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 354 | Handlers[i].func = Py_None; /* None of our business */ |
| 355 | Py_INCREF(Handlers[i].func); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 356 | } |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 357 | if (Handlers[SIGINT].func == DefaultHandler) { |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 358 | /* Install default int handler */ |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 359 | Py_INCREF(IntHandler); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 360 | Py_DECREF(Handlers[SIGINT].func); |
| 361 | Handlers[SIGINT].func = IntHandler; |
Neal Norwitz | 4178515 | 2002-06-13 21:42:51 +0000 | [diff] [blame] | 362 | old_siginthandler = PyOS_setsig(SIGINT, signal_handler); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | #ifdef SIGHUP |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 366 | x = PyInt_FromLong(SIGHUP); |
| 367 | PyDict_SetItemString(d, "SIGHUP", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 368 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 369 | #endif |
| 370 | #ifdef SIGINT |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 371 | x = PyInt_FromLong(SIGINT); |
| 372 | PyDict_SetItemString(d, "SIGINT", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 373 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 374 | #endif |
Tim Peters | 1ce3cf7 | 2001-10-01 17:58:40 +0000 | [diff] [blame] | 375 | #ifdef SIGBREAK |
| 376 | x = PyInt_FromLong(SIGBREAK); |
| 377 | PyDict_SetItemString(d, "SIGBREAK", x); |
| 378 | Py_XDECREF(x); |
| 379 | #endif |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 380 | #ifdef SIGQUIT |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 381 | x = PyInt_FromLong(SIGQUIT); |
| 382 | PyDict_SetItemString(d, "SIGQUIT", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 383 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 384 | #endif |
| 385 | #ifdef SIGILL |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 386 | x = PyInt_FromLong(SIGILL); |
| 387 | PyDict_SetItemString(d, "SIGILL", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 388 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 389 | #endif |
| 390 | #ifdef SIGTRAP |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 391 | x = PyInt_FromLong(SIGTRAP); |
| 392 | PyDict_SetItemString(d, "SIGTRAP", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 393 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 394 | #endif |
| 395 | #ifdef SIGIOT |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 396 | x = PyInt_FromLong(SIGIOT); |
| 397 | PyDict_SetItemString(d, "SIGIOT", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 398 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 399 | #endif |
| 400 | #ifdef SIGABRT |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 401 | x = PyInt_FromLong(SIGABRT); |
| 402 | PyDict_SetItemString(d, "SIGABRT", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 403 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 404 | #endif |
| 405 | #ifdef SIGEMT |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 406 | x = PyInt_FromLong(SIGEMT); |
| 407 | PyDict_SetItemString(d, "SIGEMT", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 408 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 409 | #endif |
| 410 | #ifdef SIGFPE |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 411 | x = PyInt_FromLong(SIGFPE); |
| 412 | PyDict_SetItemString(d, "SIGFPE", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 413 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 414 | #endif |
| 415 | #ifdef SIGKILL |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 416 | x = PyInt_FromLong(SIGKILL); |
| 417 | PyDict_SetItemString(d, "SIGKILL", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 418 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 419 | #endif |
| 420 | #ifdef SIGBUS |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 421 | x = PyInt_FromLong(SIGBUS); |
| 422 | PyDict_SetItemString(d, "SIGBUS", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 423 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 424 | #endif |
| 425 | #ifdef SIGSEGV |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 426 | x = PyInt_FromLong(SIGSEGV); |
| 427 | PyDict_SetItemString(d, "SIGSEGV", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 428 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 429 | #endif |
| 430 | #ifdef SIGSYS |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 431 | x = PyInt_FromLong(SIGSYS); |
| 432 | PyDict_SetItemString(d, "SIGSYS", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 433 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 434 | #endif |
| 435 | #ifdef SIGPIPE |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 436 | x = PyInt_FromLong(SIGPIPE); |
| 437 | PyDict_SetItemString(d, "SIGPIPE", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 438 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 439 | #endif |
| 440 | #ifdef SIGALRM |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 441 | x = PyInt_FromLong(SIGALRM); |
| 442 | PyDict_SetItemString(d, "SIGALRM", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 443 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 444 | #endif |
| 445 | #ifdef SIGTERM |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 446 | x = PyInt_FromLong(SIGTERM); |
| 447 | PyDict_SetItemString(d, "SIGTERM", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 448 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 449 | #endif |
| 450 | #ifdef SIGUSR1 |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 451 | x = PyInt_FromLong(SIGUSR1); |
| 452 | PyDict_SetItemString(d, "SIGUSR1", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 453 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 454 | #endif |
| 455 | #ifdef SIGUSR2 |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 456 | x = PyInt_FromLong(SIGUSR2); |
| 457 | PyDict_SetItemString(d, "SIGUSR2", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 458 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 459 | #endif |
| 460 | #ifdef SIGCLD |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 461 | x = PyInt_FromLong(SIGCLD); |
| 462 | PyDict_SetItemString(d, "SIGCLD", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 463 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 464 | #endif |
| 465 | #ifdef SIGCHLD |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 466 | x = PyInt_FromLong(SIGCHLD); |
| 467 | PyDict_SetItemString(d, "SIGCHLD", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 468 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 469 | #endif |
| 470 | #ifdef SIGPWR |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 471 | x = PyInt_FromLong(SIGPWR); |
| 472 | PyDict_SetItemString(d, "SIGPWR", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 473 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 474 | #endif |
| 475 | #ifdef SIGIO |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 476 | x = PyInt_FromLong(SIGIO); |
| 477 | PyDict_SetItemString(d, "SIGIO", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 478 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 479 | #endif |
| 480 | #ifdef SIGURG |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 481 | x = PyInt_FromLong(SIGURG); |
| 482 | PyDict_SetItemString(d, "SIGURG", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 483 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 484 | #endif |
| 485 | #ifdef SIGWINCH |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 486 | x = PyInt_FromLong(SIGWINCH); |
| 487 | PyDict_SetItemString(d, "SIGWINCH", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 488 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 489 | #endif |
| 490 | #ifdef SIGPOLL |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 491 | x = PyInt_FromLong(SIGPOLL); |
| 492 | PyDict_SetItemString(d, "SIGPOLL", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 493 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 494 | #endif |
| 495 | #ifdef SIGSTOP |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 496 | x = PyInt_FromLong(SIGSTOP); |
| 497 | PyDict_SetItemString(d, "SIGSTOP", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 498 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 499 | #endif |
| 500 | #ifdef SIGTSTP |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 501 | x = PyInt_FromLong(SIGTSTP); |
| 502 | PyDict_SetItemString(d, "SIGTSTP", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 503 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 504 | #endif |
| 505 | #ifdef SIGCONT |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 506 | x = PyInt_FromLong(SIGCONT); |
| 507 | PyDict_SetItemString(d, "SIGCONT", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 508 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 509 | #endif |
| 510 | #ifdef SIGTTIN |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 511 | x = PyInt_FromLong(SIGTTIN); |
| 512 | PyDict_SetItemString(d, "SIGTTIN", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 513 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 514 | #endif |
| 515 | #ifdef SIGTTOU |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 516 | x = PyInt_FromLong(SIGTTOU); |
| 517 | PyDict_SetItemString(d, "SIGTTOU", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 518 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 519 | #endif |
| 520 | #ifdef SIGVTALRM |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 521 | x = PyInt_FromLong(SIGVTALRM); |
| 522 | PyDict_SetItemString(d, "SIGVTALRM", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 523 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 524 | #endif |
| 525 | #ifdef SIGPROF |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 526 | x = PyInt_FromLong(SIGPROF); |
| 527 | PyDict_SetItemString(d, "SIGPROF", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 528 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 529 | #endif |
Barry Warsaw | 14ed5fb | 1996-12-16 20:24:22 +0000 | [diff] [blame] | 530 | #ifdef SIGXCPU |
| 531 | x = PyInt_FromLong(SIGXCPU); |
| 532 | PyDict_SetItemString(d, "SIGXCPU", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 533 | Py_XDECREF(x); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 534 | #endif |
Barry Warsaw | 14ed5fb | 1996-12-16 20:24:22 +0000 | [diff] [blame] | 535 | #ifdef SIGXFSZ |
| 536 | x = PyInt_FromLong(SIGXFSZ); |
| 537 | PyDict_SetItemString(d, "SIGXFSZ", x); |
Barry Warsaw | 73a75eb | 1997-01-09 23:50:28 +0000 | [diff] [blame] | 538 | Py_XDECREF(x); |
Barry Warsaw | 14ed5fb | 1996-12-16 20:24:22 +0000 | [diff] [blame] | 539 | #endif |
Anthony Baxter | f37f37d | 2003-07-31 10:35:29 +0000 | [diff] [blame] | 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 |
Martin v. Löwis | 175af25 | 2002-01-12 11:43:25 +0000 | [diff] [blame] | 550 | #ifdef SIGINFO |
| 551 | x = PyInt_FromLong(SIGINFO); |
| 552 | PyDict_SetItemString(d, "SIGINFO", x); |
| 553 | Py_XDECREF(x); |
| 554 | #endif |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 555 | if (!PyErr_Occurred()) |
| 556 | return; |
| 557 | |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 558 | /* Check for errors */ |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 559 | finally: |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 560 | return; |
| 561 | } |
| 562 | |
| 563 | static void |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 564 | finisignal(void) |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 565 | { |
| 566 | int i; |
Guido van Rossum | 7ff20ac | 1997-11-03 21:53:55 +0000 | [diff] [blame] | 567 | PyObject *func; |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 568 | |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 569 | PyOS_setsig(SIGINT, old_siginthandler); |
Guido van Rossum | 7ff20ac | 1997-11-03 21:53:55 +0000 | [diff] [blame] | 570 | old_siginthandler = SIG_DFL; |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 571 | |
| 572 | for (i = 1; i < NSIG; i++) { |
Guido van Rossum | 7ff20ac | 1997-11-03 21:53:55 +0000 | [diff] [blame] | 573 | func = Handlers[i].func; |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 574 | Handlers[i].tripped = 0; |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 575 | Handlers[i].func = NULL; |
Guido van Rossum | 7ff20ac | 1997-11-03 21:53:55 +0000 | [diff] [blame] | 576 | if (i != SIGINT && func != NULL && func != Py_None && |
| 577 | func != DefaultHandler && func != IgnoreHandler) |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 578 | PyOS_setsig(i, SIG_DFL); |
Guido van Rossum | 7ff20ac | 1997-11-03 21:53:55 +0000 | [diff] [blame] | 579 | Py_XDECREF(func); |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | Py_XDECREF(IntHandler); |
| 583 | IntHandler = NULL; |
| 584 | Py_XDECREF(DefaultHandler); |
| 585 | DefaultHandler = NULL; |
| 586 | Py_XDECREF(IgnoreHandler); |
| 587 | IgnoreHandler = NULL; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 588 | } |
| 589 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 590 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 591 | /* Declared in pyerrors.h */ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 592 | int |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 593 | PyErr_CheckSignals(void) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 594 | { |
| 595 | int i; |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 596 | PyObject *f; |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 597 | |
| 598 | if (!is_tripped) |
Guido van Rossum | 6299d1e | 1994-05-31 12:51:13 +0000 | [diff] [blame] | 599 | return 0; |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 600 | #ifdef WITH_THREAD |
Guido van Rossum | 65d5b57 | 1998-12-21 19:32:43 +0000 | [diff] [blame] | 601 | if (PyThread_get_thread_ident() != main_thread) |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 602 | return 0; |
| 603 | #endif |
Guido van Rossum | 6297a7a | 2003-02-19 15:53:17 +0000 | [diff] [blame] | 604 | if (!(f = (PyObject *)PyEval_GetFrame())) |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 605 | f = Py_None; |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 606 | |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 607 | for (i = 1; i < NSIG; i++) { |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 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); |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 616 | Py_DECREF(arglist); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 617 | } |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 618 | if (!result) |
Guido van Rossum | fcdd0e4 | 1997-01-21 06:13:09 +0000 | [diff] [blame] | 619 | return -1; |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 620 | |
| 621 | Py_DECREF(result); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 622 | } |
| 623 | } |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 624 | is_tripped = 0; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 625 | return 0; |
| 626 | } |
| 627 | |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 628 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 629 | /* Replacements for intrcheck.c functionality |
| 630 | * Declared in pyerrors.h |
| 631 | */ |
| 632 | void |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 633 | PyErr_SetInterrupt(void) |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 634 | { |
| 635 | is_tripped++; |
| 636 | Handlers[SIGINT].tripped = 1; |
Thomas Wouters | 334fb89 | 2000-07-25 12:56:38 +0000 | [diff] [blame] | 637 | Py_AddPendingCall((int (*)(void *))PyErr_CheckSignals, NULL); |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 638 | } |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 639 | |
| 640 | void |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 641 | PyOS_InitInterrupts(void) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 642 | { |
| 643 | initsignal(); |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 644 | _PyImport_FixupExtension("signal", "signal"); |
| 645 | } |
| 646 | |
| 647 | void |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 648 | PyOS_FiniInterrupts(void) |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 649 | { |
| 650 | finisignal(); |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | int |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 654 | PyOS_InterruptOccurred(void) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 655 | { |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 656 | if (Handlers[SIGINT].tripped) { |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 657 | #ifdef WITH_THREAD |
Guido van Rossum | 65d5b57 | 1998-12-21 19:32:43 +0000 | [diff] [blame] | 658 | if (PyThread_get_thread_ident() != main_thread) |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 659 | return 0; |
| 660 | #endif |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 661 | Handlers[SIGINT].tripped = 0; |
Guido van Rossum | 6299d1e | 1994-05-31 12:51:13 +0000 | [diff] [blame] | 662 | return 1; |
| 663 | } |
| 664 | return 0; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 665 | } |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 666 | |
| 667 | void |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 668 | PyOS_AfterFork(void) |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 669 | { |
| 670 | #ifdef WITH_THREAD |
Guido van Rossum | fee3a2d | 2000-08-27 17:34:07 +0000 | [diff] [blame] | 671 | PyEval_ReInitThreads(); |
Guido van Rossum | 65d5b57 | 1998-12-21 19:32:43 +0000 | [diff] [blame] | 672 | main_thread = PyThread_get_thread_ident(); |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 673 | main_pid = getpid(); |
Guido van Rossum | 8ee3e5a | 2005-09-14 18:09:42 +0000 | [diff] [blame] | 674 | _PyImport_ReInitLock(); |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 675 | #endif |
| 676 | } |