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" |
Victor Stinner | 27e2d1f | 2018-11-01 00:52:28 +0100 | [diff] [blame] | 7 | #include "pycore_atomic.h" |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 8 | #include "pycore_call.h" |
Victor Stinner | 09532fe | 2019-05-10 23:39:09 +0200 | [diff] [blame] | 9 | #include "pycore_ceval.h" |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 10 | #include "pycore_pyerrors.h" |
Victor Stinner | e5014be | 2020-04-14 17:52:15 +0200 | [diff] [blame] | 11 | #include "pycore_pystate.h" // _PyThreadState_GET() |
Victor Stinner | 31368a4 | 2018-10-30 15:14:25 +0100 | [diff] [blame] | 12 | |
Serhiy Storchaka | 7cf5599 | 2013-02-10 21:56:49 +0200 | [diff] [blame] | 13 | #ifndef MS_WINDOWS |
| 14 | #include "posixmodule.h" |
| 15 | #endif |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 16 | #ifdef MS_WINDOWS |
| 17 | #include "socketmodule.h" /* needed for SOCKET_T */ |
| 18 | #endif |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 19 | |
Martin v. Löwis | 6238d2b | 2002-06-30 15:26:10 +0000 | [diff] [blame] | 20 | #ifdef MS_WINDOWS |
Antoine Pitrou | 7faf705 | 2013-03-31 22:48:04 +0200 | [diff] [blame] | 21 | #include <windows.h> |
Benjamin Peterson | 2614cda | 2010-03-21 22:36:19 +0000 | [diff] [blame] | 22 | #ifdef HAVE_PROCESS_H |
Guido van Rossum | 644a12b | 1997-04-09 19:24:53 +0000 | [diff] [blame] | 23 | #include <process.h> |
| 24 | #endif |
Benjamin Peterson | 2614cda | 2010-03-21 22:36:19 +0000 | [diff] [blame] | 25 | #endif |
Guido van Rossum | 644a12b | 1997-04-09 19:24:53 +0000 | [diff] [blame] | 26 | |
Benjamin Peterson | 2614cda | 2010-03-21 22:36:19 +0000 | [diff] [blame] | 27 | #ifdef HAVE_SIGNAL_H |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 28 | #include <signal.h> |
Benjamin Peterson | 2614cda | 2010-03-21 22:36:19 +0000 | [diff] [blame] | 29 | #endif |
Benjamin Peterson | 7483451 | 2019-11-19 20:39:14 -0800 | [diff] [blame] | 30 | #ifdef HAVE_SYS_SYSCALL_H |
| 31 | #include <sys/syscall.h> |
| 32 | #endif |
Benjamin Peterson | 2614cda | 2010-03-21 22:36:19 +0000 | [diff] [blame] | 33 | #ifdef HAVE_SYS_STAT_H |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 34 | #include <sys/stat.h> |
Benjamin Peterson | 2614cda | 2010-03-21 22:36:19 +0000 | [diff] [blame] | 35 | #endif |
Martin v. Löwis | 3bf3cc0 | 2008-03-24 14:05:07 +0000 | [diff] [blame] | 36 | #ifdef HAVE_SYS_TIME_H |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 37 | #include <sys/time.h> |
Martin v. Löwis | 3bf3cc0 | 2008-03-24 14:05:07 +0000 | [diff] [blame] | 38 | #endif |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 39 | |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 40 | #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK) |
| 41 | # define PYPTHREAD_SIGMASK |
| 42 | #endif |
| 43 | |
| 44 | #if defined(PYPTHREAD_SIGMASK) && defined(HAVE_PTHREAD_H) |
| 45 | # include <pthread.h> |
| 46 | #endif |
| 47 | |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 48 | #ifndef SIG_ERR |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 49 | #define SIG_ERR ((PyOS_sighandler_t)(-1)) |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 50 | #endif |
| 51 | |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 52 | #ifndef NSIG |
Marc-André Lemburg | 8bcfb8a | 2000-07-04 14:17:33 +0000 | [diff] [blame] | 53 | # if defined(_NSIG) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 54 | # define NSIG _NSIG /* For BSD/SysV */ |
Marc-André Lemburg | 8bcfb8a | 2000-07-04 14:17:33 +0000 | [diff] [blame] | 55 | # elif defined(_SIGMAX) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 56 | # define NSIG (_SIGMAX + 1) /* For QNX */ |
Marc-André Lemburg | 8bcfb8a | 2000-07-04 14:17:33 +0000 | [diff] [blame] | 57 | # elif defined(SIGMAX) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 58 | # define NSIG (SIGMAX + 1) /* For djgpp */ |
Marc-André Lemburg | 8bcfb8a | 2000-07-04 14:17:33 +0000 | [diff] [blame] | 59 | # else |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 60 | # define NSIG 64 /* Use a reasonable default value */ |
Marc-André Lemburg | 8bcfb8a | 2000-07-04 14:17:33 +0000 | [diff] [blame] | 61 | # endif |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 62 | #endif |
| 63 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 64 | #include "clinic/signalmodule.c.h" |
| 65 | |
| 66 | /*[clinic input] |
| 67 | module signal |
| 68 | [clinic start generated code]*/ |
| 69 | /*[clinic end generated code: output=da39a3ee5e6b4b0d input=b0301a3bde5fe9d3]*/ |
| 70 | |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 71 | /*[python input] |
| 72 | |
| 73 | class sigset_t_converter(CConverter): |
| 74 | type = 'sigset_t' |
| 75 | converter = '_Py_Sigset_Converter' |
| 76 | |
| 77 | [python start generated code]*/ |
| 78 | /*[python end generated code: output=da39a3ee5e6b4b0d input=b5689d14466b6823]*/ |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 79 | |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 80 | /* |
| 81 | NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS |
| 82 | |
Jeroen Demeyer | d237b3f | 2019-05-10 03:28:57 +0200 | [diff] [blame] | 83 | We want the following semantics: |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 84 | |
| 85 | - only the main thread can set a signal handler |
Jeroen Demeyer | d237b3f | 2019-05-10 03:28:57 +0200 | [diff] [blame] | 86 | - only the main thread runs the signal handler |
| 87 | - signals can be delivered to any thread |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 88 | - any thread can get a signal handler |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 89 | |
| 90 | I.e. we don't support "synchronous signals" like SIGFPE (catching |
| 91 | this doesn't make much sense in Python anyway) nor do we support |
| 92 | signals as a means of inter-thread communication, since not all |
| 93 | thread implementations support that (at least our thread library |
| 94 | doesn't). |
| 95 | |
| 96 | We still have the problem that in some implementations signals |
| 97 | generated by the keyboard (e.g. SIGINT) are delivered to all |
| 98 | threads (e.g. SGI), while in others (e.g. Solaris) such signals are |
Jeroen Demeyer | d237b3f | 2019-05-10 03:28:57 +0200 | [diff] [blame] | 99 | delivered to one random thread. On Linux, signals are delivered to |
| 100 | the main thread (unless the main thread is blocking the signal, for |
| 101 | example because it's already handling the same signal). Since we |
| 102 | allow signals to be delivered to any thread, this works fine. The |
| 103 | only oddity is that the thread executing the Python signal handler |
| 104 | may not be the thread that received the signal. |
Guido van Rossum | bb4ba12 | 1994-06-23 11:25:45 +0000 | [diff] [blame] | 105 | */ |
| 106 | |
Victor Stinner | 2ec6b17 | 2011-05-15 10:21:59 +0200 | [diff] [blame] | 107 | static volatile struct { |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 108 | _Py_atomic_int tripped; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 109 | PyObject *func; |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 110 | } Handlers[NSIG]; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 111 | |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 112 | #ifdef MS_WINDOWS |
| 113 | #define INVALID_FD ((SOCKET_T)-1) |
| 114 | |
| 115 | static volatile struct { |
| 116 | SOCKET_T fd; |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 117 | int warn_on_full_buffer; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 118 | int use_send; |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 119 | } wakeup = {.fd = INVALID_FD, .warn_on_full_buffer = 1, .use_send = 0}; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 120 | #else |
| 121 | #define INVALID_FD (-1) |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 122 | static volatile struct { |
pxinwr | 1244c81 | 2020-12-01 05:48:33 +0800 | [diff] [blame] | 123 | #ifdef __VXWORKS__ |
| 124 | int fd; |
| 125 | #else |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 126 | sig_atomic_t fd; |
pxinwr | 1244c81 | 2020-12-01 05:48:33 +0800 | [diff] [blame] | 127 | #endif |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 128 | int warn_on_full_buffer; |
| 129 | } wakeup = {.fd = INVALID_FD, .warn_on_full_buffer = 1}; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 130 | #endif |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 131 | |
Christian Heimes | b76922a | 2007-12-11 01:06:40 +0000 | [diff] [blame] | 132 | /* Speed up sigcheck() when none tripped */ |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 133 | static _Py_atomic_int is_tripped; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 134 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 135 | static PyObject *DefaultHandler; |
| 136 | static PyObject *IgnoreHandler; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 137 | |
Antoine Pitrou | 6dd381e | 2011-11-21 21:26:56 +0100 | [diff] [blame] | 138 | #ifdef MS_WINDOWS |
| 139 | static HANDLE sigint_event = NULL; |
| 140 | #endif |
| 141 | |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 142 | #if defined(HAVE_GETITIMER) || defined(HAVE_SETITIMER) |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 143 | static PyObject *ItimerError; |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 144 | #endif |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 145 | |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 146 | #ifdef HAVE_GETITIMER |
Victor Stinner | ef611c9 | 2017-10-13 13:49:43 -0700 | [diff] [blame] | 147 | /* auxiliary functions for setitimer */ |
| 148 | static int |
| 149 | timeval_from_double(PyObject *obj, struct timeval *tv) |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 150 | { |
Victor Stinner | ef611c9 | 2017-10-13 13:49:43 -0700 | [diff] [blame] | 151 | if (obj == NULL) { |
| 152 | tv->tv_sec = 0; |
| 153 | tv->tv_usec = 0; |
| 154 | return 0; |
Antoine Pitrou | 729780a | 2017-06-30 10:01:05 +0200 | [diff] [blame] | 155 | } |
Victor Stinner | ef611c9 | 2017-10-13 13:49:43 -0700 | [diff] [blame] | 156 | |
| 157 | _PyTime_t t; |
| 158 | if (_PyTime_FromSecondsObject(&t, obj, _PyTime_ROUND_CEILING) < 0) { |
| 159 | return -1; |
| 160 | } |
| 161 | return _PyTime_AsTimeval(t, tv, _PyTime_ROUND_CEILING); |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 162 | } |
| 163 | |
Christian Heimes | 1a8501c | 2008-10-02 19:56:01 +0000 | [diff] [blame] | 164 | Py_LOCAL_INLINE(double) |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 165 | double_from_timeval(struct timeval *tv) |
| 166 | { |
| 167 | return tv->tv_sec + (double)(tv->tv_usec / 1000000.0); |
| 168 | } |
| 169 | |
| 170 | static PyObject * |
| 171 | itimer_retval(struct itimerval *iv) |
| 172 | { |
| 173 | PyObject *r, *v; |
| 174 | |
| 175 | r = PyTuple_New(2); |
| 176 | if (r == NULL) |
Martin Panter | 6d57fe1 | 2016-09-17 03:26:16 +0000 | [diff] [blame] | 177 | return NULL; |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 178 | |
| 179 | if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_value)))) { |
Martin Panter | 6d57fe1 | 2016-09-17 03:26:16 +0000 | [diff] [blame] | 180 | Py_DECREF(r); |
| 181 | return NULL; |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | PyTuple_SET_ITEM(r, 0, v); |
| 185 | |
| 186 | if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_interval)))) { |
Martin Panter | 6d57fe1 | 2016-09-17 03:26:16 +0000 | [diff] [blame] | 187 | Py_DECREF(r); |
| 188 | return NULL; |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | PyTuple_SET_ITEM(r, 1, v); |
| 192 | |
| 193 | return r; |
| 194 | } |
| 195 | #endif |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 196 | |
Serhiy Storchaka | b0689ae | 2020-07-12 19:15:20 +0300 | [diff] [blame] | 197 | /*[clinic input] |
| 198 | signal.default_int_handler |
| 199 | signalnum: int |
| 200 | frame: object |
| 201 | / |
| 202 | |
| 203 | The default handler for SIGINT installed by Python. |
| 204 | |
| 205 | It raises KeyboardInterrupt. |
| 206 | [clinic start generated code]*/ |
| 207 | |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 208 | static PyObject * |
Serhiy Storchaka | b0689ae | 2020-07-12 19:15:20 +0300 | [diff] [blame] | 209 | signal_default_int_handler_impl(PyObject *module, int signalnum, |
| 210 | PyObject *frame) |
| 211 | /*[clinic end generated code: output=bb11c2eb115ace4e input=efcd4a56a207acfd]*/ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 212 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 213 | PyErr_SetNone(PyExc_KeyboardInterrupt); |
| 214 | return NULL; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 215 | } |
| 216 | |
Thomas Wouters | 0796b00 | 2000-07-22 23:49:30 +0000 | [diff] [blame] | 217 | |
| 218 | static int |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 219 | report_wakeup_write_error(void *data) |
Antoine Pitrou | 6f6ec37 | 2013-08-17 20:27:56 +0200 | [diff] [blame] | 220 | { |
Eric Snow | fdf282d | 2019-01-11 14:26:55 -0700 | [diff] [blame] | 221 | PyObject *exc, *val, *tb; |
Antoine Pitrou | 6f6ec37 | 2013-08-17 20:27:56 +0200 | [diff] [blame] | 222 | int save_errno = errno; |
Benjamin Peterson | ca47063 | 2016-09-06 13:47:26 -0700 | [diff] [blame] | 223 | errno = (int) (intptr_t) data; |
Eric Snow | fdf282d | 2019-01-11 14:26:55 -0700 | [diff] [blame] | 224 | PyErr_Fetch(&exc, &val, &tb); |
Antoine Pitrou | 6f6ec37 | 2013-08-17 20:27:56 +0200 | [diff] [blame] | 225 | PyErr_SetFromErrno(PyExc_OSError); |
| 226 | PySys_WriteStderr("Exception ignored when trying to write to the " |
| 227 | "signal wakeup fd:\n"); |
| 228 | PyErr_WriteUnraisable(NULL); |
Eric Snow | fdf282d | 2019-01-11 14:26:55 -0700 | [diff] [blame] | 229 | PyErr_Restore(exc, val, tb); |
Antoine Pitrou | 6f6ec37 | 2013-08-17 20:27:56 +0200 | [diff] [blame] | 230 | errno = save_errno; |
| 231 | return 0; |
| 232 | } |
| 233 | |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 234 | #ifdef MS_WINDOWS |
| 235 | static int |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 236 | report_wakeup_send_error(void* data) |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 237 | { |
Eric Snow | fdf282d | 2019-01-11 14:26:55 -0700 | [diff] [blame] | 238 | PyObject *exc, *val, *tb; |
| 239 | PyErr_Fetch(&exc, &val, &tb); |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 240 | /* PyErr_SetExcFromWindowsErr() invokes FormatMessage() which |
| 241 | recognizes the error codes used by both GetLastError() and |
| 242 | WSAGetLastError */ |
| 243 | PyErr_SetExcFromWindowsErr(PyExc_OSError, (int) (intptr_t) data); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 244 | PySys_WriteStderr("Exception ignored when trying to send to the " |
| 245 | "signal wakeup fd:\n"); |
| 246 | PyErr_WriteUnraisable(NULL); |
Eric Snow | fdf282d | 2019-01-11 14:26:55 -0700 | [diff] [blame] | 247 | PyErr_Restore(exc, val, tb); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 248 | return 0; |
| 249 | } |
| 250 | #endif /* MS_WINDOWS */ |
| 251 | |
Tim Peters | 4f1b208 | 2000-07-23 21:18:09 +0000 | [diff] [blame] | 252 | static void |
Victor Stinner | 6c9b35b | 2011-04-18 16:25:56 +0200 | [diff] [blame] | 253 | trip_signal(int sig_num) |
| 254 | { |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 255 | _Py_atomic_store_relaxed(&Handlers[sig_num].tripped, 1); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 256 | |
Antoine Pitrou | c08177a | 2017-06-28 23:29:29 +0200 | [diff] [blame] | 257 | /* Set is_tripped after setting .tripped, as it gets |
| 258 | cleared in PyErr_CheckSignals() before .tripped. */ |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 259 | _Py_atomic_store(&is_tripped, 1); |
| 260 | |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 261 | /* Signals are always handled by the main interpreter */ |
| 262 | PyInterpreterState *interp = _PyRuntime.interpreters.main; |
Victor Stinner | 8849e59 | 2020-03-18 19:28:53 +0100 | [diff] [blame] | 263 | |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 264 | /* Notify ceval.c */ |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 265 | _PyEval_SignalReceived(interp); |
Nathaniel J. Smith | 4ae0149 | 2017-05-16 14:12:11 -0700 | [diff] [blame] | 266 | |
| 267 | /* And then write to the wakeup fd *after* setting all the globals and |
Antoine Pitrou | c08177a | 2017-06-28 23:29:29 +0200 | [diff] [blame] | 268 | doing the _PyEval_SignalReceived. We used to write to the wakeup fd |
| 269 | and then set the flag, but this allowed the following sequence of events |
| 270 | (especially on windows, where trip_signal may run in a new thread): |
Nathaniel J. Smith | 4ae0149 | 2017-05-16 14:12:11 -0700 | [diff] [blame] | 271 | |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 272 | - main thread blocks on select([wakeup.fd], ...) |
Nathaniel J. Smith | 4ae0149 | 2017-05-16 14:12:11 -0700 | [diff] [blame] | 273 | - signal arrives |
| 274 | - trip_signal writes to the wakeup fd |
| 275 | - the main thread wakes up |
| 276 | - the main thread checks the signal flags, sees that they're unset |
| 277 | - the main thread empties the wakeup fd |
| 278 | - the main thread goes back to sleep |
| 279 | - trip_signal sets the flags to request the Python-level signal handler |
| 280 | be run |
| 281 | - the main thread doesn't notice, because it's asleep |
| 282 | |
| 283 | See bpo-30038 for more details. |
| 284 | */ |
| 285 | |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 286 | int fd; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 287 | #ifdef MS_WINDOWS |
| 288 | fd = Py_SAFE_DOWNCAST(wakeup.fd, SOCKET_T, int); |
| 289 | #else |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 290 | fd = wakeup.fd; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 291 | #endif |
| 292 | |
| 293 | if (fd != INVALID_FD) { |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 294 | unsigned char byte = (unsigned char)sig_num; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 295 | #ifdef MS_WINDOWS |
| 296 | if (wakeup.use_send) { |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 297 | Py_ssize_t rc = send(fd, &byte, 1, 0); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 298 | |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 299 | if (rc < 0) { |
| 300 | int last_error = GetLastError(); |
| 301 | if (wakeup.warn_on_full_buffer || |
| 302 | last_error != WSAEWOULDBLOCK) |
| 303 | { |
Victor Stinner | 50e6e99 | 2020-03-19 02:41:21 +0100 | [diff] [blame] | 304 | /* _PyEval_AddPendingCall() isn't signal-safe, but we |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 305 | still use it for this exceptional case. */ |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 306 | _PyEval_AddPendingCall(interp, |
Victor Stinner | 09532fe | 2019-05-10 23:39:09 +0200 | [diff] [blame] | 307 | report_wakeup_send_error, |
| 308 | (void *)(intptr_t) last_error); |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 309 | } |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 310 | } |
| 311 | } |
| 312 | else |
| 313 | #endif |
| 314 | { |
Victor Stinner | e72fe39 | 2015-04-01 18:35:22 +0200 | [diff] [blame] | 315 | /* _Py_write_noraise() retries write() if write() is interrupted by |
| 316 | a signal (fails with EINTR). */ |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 317 | Py_ssize_t rc = _Py_write_noraise(fd, &byte, 1); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 318 | |
| 319 | if (rc < 0) { |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 320 | if (wakeup.warn_on_full_buffer || |
| 321 | (errno != EWOULDBLOCK && errno != EAGAIN)) |
| 322 | { |
Victor Stinner | 50e6e99 | 2020-03-19 02:41:21 +0100 | [diff] [blame] | 323 | /* _PyEval_AddPendingCall() isn't signal-safe, but we |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 324 | still use it for this exceptional case. */ |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 325 | _PyEval_AddPendingCall(interp, |
Victor Stinner | 09532fe | 2019-05-10 23:39:09 +0200 | [diff] [blame] | 326 | report_wakeup_write_error, |
| 327 | (void *)(intptr_t)errno); |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 328 | } |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 329 | } |
| 330 | } |
Victor Stinner | c13ef66 | 2011-05-25 02:35:58 +0200 | [diff] [blame] | 331 | } |
Victor Stinner | 6c9b35b | 2011-04-18 16:25:56 +0200 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | static void |
Peter Schneider-Kamp | e89b156 | 2000-07-10 12:04:18 +0000 | [diff] [blame] | 335 | signal_handler(int sig_num) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 336 | { |
Antoine Pitrou | 39a6591 | 2010-11-05 19:47:27 +0000 | [diff] [blame] | 337 | int save_errno = errno; |
| 338 | |
Jeroen Demeyer | d237b3f | 2019-05-10 03:28:57 +0200 | [diff] [blame] | 339 | trip_signal(sig_num); |
Antoine Pitrou | 39a6591 | 2010-11-05 19:47:27 +0000 | [diff] [blame] | 340 | |
Jean-Paul Calderone | 6f137ca | 2010-05-09 03:18:57 +0000 | [diff] [blame] | 341 | #ifndef HAVE_SIGACTION |
Antoine Pitrou | 39a6591 | 2010-11-05 19:47:27 +0000 | [diff] [blame] | 342 | #ifdef SIGCHLD |
| 343 | /* To avoid infinite recursion, this signal remains |
| 344 | reset until explicit re-instated. |
| 345 | Don't clear the 'func' field as it is our pointer |
| 346 | to the Python handler... */ |
| 347 | if (sig_num != SIGCHLD) |
| 348 | #endif |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 349 | /* If the handler was not set up with sigaction, reinstall it. See |
Nick Coghlan | d600951 | 2014-11-20 21:39:37 +1000 | [diff] [blame] | 350 | * Python/pylifecycle.c for the implementation of PyOS_setsig which |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 351 | * makes this true. See also issue8354. */ |
| 352 | PyOS_setsig(sig_num, signal_handler); |
Jean-Paul Calderone | 6f137ca | 2010-05-09 03:18:57 +0000 | [diff] [blame] | 353 | #endif |
Antoine Pitrou | 39a6591 | 2010-11-05 19:47:27 +0000 | [diff] [blame] | 354 | |
| 355 | /* Issue #10311: asynchronously executing signal handlers should not |
| 356 | mutate errno under the feet of unsuspecting C code. */ |
| 357 | errno = save_errno; |
Antoine Pitrou | 6dd381e | 2011-11-21 21:26:56 +0100 | [diff] [blame] | 358 | |
| 359 | #ifdef MS_WINDOWS |
| 360 | if (sig_num == SIGINT) |
| 361 | SetEvent(sigint_event); |
| 362 | #endif |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 363 | } |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 364 | |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 365 | |
Guido van Rossum | 1171ee6 | 1997-08-22 20:42:00 +0000 | [diff] [blame] | 366 | #ifdef HAVE_ALARM |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 367 | |
| 368 | /*[clinic input] |
| 369 | signal.alarm -> long |
| 370 | |
| 371 | seconds: int |
| 372 | / |
| 373 | |
| 374 | Arrange for SIGALRM to arrive after the given number of seconds. |
| 375 | [clinic start generated code]*/ |
| 376 | |
| 377 | static long |
Serhiy Storchaka | 1a2b24f | 2016-07-07 17:35:15 +0300 | [diff] [blame] | 378 | signal_alarm_impl(PyObject *module, int seconds) |
| 379 | /*[clinic end generated code: output=144232290814c298 input=0d5e97e0e6f39e86]*/ |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 380 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 381 | /* alarm() returns the number of seconds remaining */ |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 382 | return (long)alarm(seconds); |
Guido van Rossum | aa0f4c7 | 1994-08-23 13:49:37 +0000 | [diff] [blame] | 383 | } |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 384 | |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 385 | #endif |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 386 | |
Guido van Rossum | 1171ee6 | 1997-08-22 20:42:00 +0000 | [diff] [blame] | 387 | #ifdef HAVE_PAUSE |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 388 | |
| 389 | /*[clinic input] |
| 390 | signal.pause |
| 391 | |
| 392 | Wait until a signal arrives. |
| 393 | [clinic start generated code]*/ |
| 394 | |
Guido van Rossum | a597dde | 1995-01-10 20:56:29 +0000 | [diff] [blame] | 395 | static PyObject * |
Serhiy Storchaka | 1a2b24f | 2016-07-07 17:35:15 +0300 | [diff] [blame] | 396 | signal_pause_impl(PyObject *module) |
| 397 | /*[clinic end generated code: output=391656788b3c3929 input=f03de0f875752062]*/ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 398 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 399 | Py_BEGIN_ALLOW_THREADS |
| 400 | (void)pause(); |
| 401 | Py_END_ALLOW_THREADS |
| 402 | /* make sure that any exceptions that got raised are propagated |
| 403 | * back into Python |
| 404 | */ |
| 405 | if (PyErr_CheckSignals()) |
| 406 | return NULL; |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 407 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 408 | Py_RETURN_NONE; |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 409 | } |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 410 | |
Guido van Rossum | 06d511d | 1995-03-10 15:13:48 +0000 | [diff] [blame] | 411 | #endif |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 412 | |
Vladimir Matveev | c24c6c2 | 2019-01-08 01:58:25 -0800 | [diff] [blame] | 413 | /*[clinic input] |
| 414 | signal.raise_signal |
| 415 | |
| 416 | signalnum: int |
| 417 | / |
| 418 | |
| 419 | Send a signal to the executing process. |
| 420 | [clinic start generated code]*/ |
| 421 | |
| 422 | static PyObject * |
| 423 | signal_raise_signal_impl(PyObject *module, int signalnum) |
| 424 | /*[clinic end generated code: output=e2b014220aa6111d input=e90c0f9a42358de6]*/ |
| 425 | { |
| 426 | int err; |
| 427 | Py_BEGIN_ALLOW_THREADS |
| 428 | _Py_BEGIN_SUPPRESS_IPH |
| 429 | err = raise(signalnum); |
| 430 | _Py_END_SUPPRESS_IPH |
| 431 | Py_END_ALLOW_THREADS |
Victor Stinner | 09532fe | 2019-05-10 23:39:09 +0200 | [diff] [blame] | 432 | |
Vladimir Matveev | c24c6c2 | 2019-01-08 01:58:25 -0800 | [diff] [blame] | 433 | if (err) { |
| 434 | return PyErr_SetFromErrno(PyExc_OSError); |
| 435 | } |
| 436 | Py_RETURN_NONE; |
| 437 | } |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 438 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 439 | /*[clinic input] |
| 440 | signal.signal |
| 441 | |
| 442 | signalnum: int |
| 443 | handler: object |
| 444 | / |
| 445 | |
| 446 | Set the action for the given signal. |
| 447 | |
| 448 | The action can be SIG_DFL, SIG_IGN, or a callable Python object. |
| 449 | The previous action is returned. See getsignal() for possible return values. |
| 450 | |
| 451 | *** IMPORTANT NOTICE *** |
| 452 | A signal handler function is called with two arguments: |
| 453 | the first is the signal number, the second is the interrupted stack frame. |
| 454 | [clinic start generated code]*/ |
| 455 | |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 456 | static PyObject * |
Serhiy Storchaka | 1a2b24f | 2016-07-07 17:35:15 +0300 | [diff] [blame] | 457 | signal_signal_impl(PyObject *module, int signalnum, PyObject *handler) |
| 458 | /*[clinic end generated code: output=b44cfda43780f3a1 input=deee84af5fa0432c]*/ |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 459 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 460 | PyObject *old_handler; |
| 461 | void (*func)(int); |
Brian Curtin | ef9efbd | 2010-08-06 19:27:32 +0000 | [diff] [blame] | 462 | #ifdef MS_WINDOWS |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 463 | /* Validate that signalnum is one of the allowable signals */ |
| 464 | switch (signalnum) { |
Brian Curtin | c734b31 | 2010-09-06 16:04:10 +0000 | [diff] [blame] | 465 | case SIGABRT: break; |
Brian Curtin | 9e88b5a | 2010-10-01 14:49:24 +0000 | [diff] [blame] | 466 | #ifdef SIGBREAK |
| 467 | /* Issue #10003: SIGBREAK is not documented as permitted, but works |
| 468 | and corresponds to CTRL_BREAK_EVENT. */ |
| 469 | case SIGBREAK: break; |
| 470 | #endif |
Brian Curtin | c734b31 | 2010-09-06 16:04:10 +0000 | [diff] [blame] | 471 | case SIGFPE: break; |
| 472 | case SIGILL: break; |
| 473 | case SIGINT: break; |
| 474 | case SIGSEGV: break; |
| 475 | case SIGTERM: break; |
| 476 | default: |
| 477 | PyErr_SetString(PyExc_ValueError, "invalid signal value"); |
| 478 | return NULL; |
Brian Curtin | ef9efbd | 2010-08-06 19:27:32 +0000 | [diff] [blame] | 479 | } |
| 480 | #endif |
Victor Stinner | d8613dc | 2019-05-24 13:43:55 +0200 | [diff] [blame] | 481 | |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 482 | PyThreadState *tstate = _PyThreadState_GET(); |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 483 | if (!_Py_ThreadCanHandleSignals(tstate->interp)) { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 484 | _PyErr_SetString(tstate, PyExc_ValueError, |
| 485 | "signal only works in main thread " |
| 486 | "of the main interpreter"); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 487 | return NULL; |
| 488 | } |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 489 | if (signalnum < 1 || signalnum >= NSIG) { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 490 | _PyErr_SetString(tstate, PyExc_ValueError, |
| 491 | "signal number out of range"); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 492 | return NULL; |
| 493 | } |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 494 | if (handler == IgnoreHandler) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 495 | func = SIG_IGN; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 496 | } |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 497 | else if (handler == DefaultHandler) { |
| 498 | func = SIG_DFL; |
| 499 | } |
| 500 | else if (!PyCallable_Check(handler)) { |
| 501 | _PyErr_SetString(tstate, PyExc_TypeError, |
| 502 | "signal handler must be signal.SIG_IGN, " |
| 503 | "signal.SIG_DFL, or a callable object"); |
| 504 | return NULL; |
| 505 | } |
| 506 | else { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 507 | func = signal_handler; |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 508 | } |
| 509 | |
Antoine Pitrou | f6f90ff | 2017-11-03 19:58:46 +0100 | [diff] [blame] | 510 | /* Check for pending signals before changing signal handler */ |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 511 | if (_PyErr_CheckSignalsTstate(tstate)) { |
Antoine Pitrou | f6f90ff | 2017-11-03 19:58:46 +0100 | [diff] [blame] | 512 | return NULL; |
| 513 | } |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 514 | if (PyOS_setsig(signalnum, func) == SIG_ERR) { |
Victor Stinner | 388196e | 2011-05-10 17:13:00 +0200 | [diff] [blame] | 515 | PyErr_SetFromErrno(PyExc_OSError); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 516 | return NULL; |
| 517 | } |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 518 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 519 | old_handler = Handlers[signalnum].func; |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 520 | Handlers[signalnum].func = Py_NewRef(handler); |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 521 | |
| 522 | if (old_handler != NULL) { |
Antoine Pitrou | c8c952c | 2013-05-04 23:16:59 +0200 | [diff] [blame] | 523 | return old_handler; |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 524 | } |
| 525 | else { |
Antoine Pitrou | c8c952c | 2013-05-04 23:16:59 +0200 | [diff] [blame] | 526 | Py_RETURN_NONE; |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 527 | } |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 528 | } |
| 529 | |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 530 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 531 | /*[clinic input] |
| 532 | signal.getsignal |
| 533 | |
| 534 | signalnum: int |
| 535 | / |
| 536 | |
| 537 | Return the current action for the given signal. |
| 538 | |
| 539 | The return value can be: |
| 540 | SIG_IGN -- if the signal is being ignored |
| 541 | SIG_DFL -- if the default action for the signal is in effect |
| 542 | None -- if an unknown handler is in effect |
| 543 | anything else -- the callable Python object used as a handler |
| 544 | [clinic start generated code]*/ |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 545 | |
Guido van Rossum | e4485b0 | 1994-09-07 14:32:49 +0000 | [diff] [blame] | 546 | static PyObject * |
Serhiy Storchaka | 1a2b24f | 2016-07-07 17:35:15 +0300 | [diff] [blame] | 547 | signal_getsignal_impl(PyObject *module, int signalnum) |
| 548 | /*[clinic end generated code: output=35b3e0e796fd555e input=ac23a00f19dfa509]*/ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 549 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 550 | PyObject *old_handler; |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 551 | if (signalnum < 1 || signalnum >= NSIG) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 552 | PyErr_SetString(PyExc_ValueError, |
| 553 | "signal number out of range"); |
| 554 | return NULL; |
| 555 | } |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 556 | old_handler = Handlers[signalnum].func; |
Antoine Pitrou | c8c952c | 2013-05-04 23:16:59 +0200 | [diff] [blame] | 557 | if (old_handler != NULL) { |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 558 | return Py_NewRef(old_handler); |
Antoine Pitrou | c8c952c | 2013-05-04 23:16:59 +0200 | [diff] [blame] | 559 | } |
| 560 | else { |
| 561 | Py_RETURN_NONE; |
| 562 | } |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 563 | } |
| 564 | |
Antoine Pietri | 5d2a27d | 2018-03-12 14:42:34 +0100 | [diff] [blame] | 565 | |
| 566 | /*[clinic input] |
| 567 | signal.strsignal |
| 568 | |
| 569 | signalnum: int |
| 570 | / |
| 571 | |
| 572 | Return the system description of the given signal. |
| 573 | |
| 574 | The return values can be such as "Interrupt", "Segmentation fault", etc. |
| 575 | Returns None if the signal is not recognized. |
| 576 | [clinic start generated code]*/ |
| 577 | |
| 578 | static PyObject * |
| 579 | signal_strsignal_impl(PyObject *module, int signalnum) |
| 580 | /*[clinic end generated code: output=44e12e1e3b666261 input=b77914b03f856c74]*/ |
| 581 | { |
| 582 | char *res; |
| 583 | |
| 584 | if (signalnum < 1 || signalnum >= NSIG) { |
| 585 | PyErr_SetString(PyExc_ValueError, |
| 586 | "signal number out of range"); |
| 587 | return NULL; |
| 588 | } |
| 589 | |
Michael Osipov | 48ce489 | 2018-08-23 15:27:19 +0200 | [diff] [blame] | 590 | #ifndef HAVE_STRSIGNAL |
Antoine Pietri | 5d2a27d | 2018-03-12 14:42:34 +0100 | [diff] [blame] | 591 | switch (signalnum) { |
Michael Osipov | 48ce489 | 2018-08-23 15:27:19 +0200 | [diff] [blame] | 592 | /* Though being a UNIX, HP-UX does not provide strsignal(3). */ |
| 593 | #ifndef MS_WINDOWS |
| 594 | case SIGHUP: |
| 595 | res = "Hangup"; |
| 596 | break; |
| 597 | case SIGALRM: |
| 598 | res = "Alarm clock"; |
| 599 | break; |
| 600 | case SIGPIPE: |
| 601 | res = "Broken pipe"; |
| 602 | break; |
| 603 | case SIGQUIT: |
| 604 | res = "Quit"; |
| 605 | break; |
| 606 | case SIGCHLD: |
| 607 | res = "Child exited"; |
| 608 | break; |
| 609 | #endif |
| 610 | /* Custom redefinition of POSIX signals allowed on Windows. */ |
Antoine Pietri | 5d2a27d | 2018-03-12 14:42:34 +0100 | [diff] [blame] | 611 | case SIGINT: |
| 612 | res = "Interrupt"; |
| 613 | break; |
| 614 | case SIGILL: |
| 615 | res = "Illegal instruction"; |
| 616 | break; |
| 617 | case SIGABRT: |
| 618 | res = "Aborted"; |
| 619 | break; |
| 620 | case SIGFPE: |
| 621 | res = "Floating point exception"; |
| 622 | break; |
| 623 | case SIGSEGV: |
| 624 | res = "Segmentation fault"; |
| 625 | break; |
| 626 | case SIGTERM: |
| 627 | res = "Terminated"; |
| 628 | break; |
| 629 | default: |
| 630 | Py_RETURN_NONE; |
| 631 | } |
| 632 | #else |
| 633 | errno = 0; |
| 634 | res = strsignal(signalnum); |
| 635 | |
| 636 | if (errno || res == NULL || strstr(res, "Unknown signal") != NULL) |
| 637 | Py_RETURN_NONE; |
| 638 | #endif |
| 639 | |
| 640 | return Py_BuildValue("s", res); |
| 641 | } |
| 642 | |
Christian Heimes | 8640e74 | 2008-02-23 16:23:06 +0000 | [diff] [blame] | 643 | #ifdef HAVE_SIGINTERRUPT |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 644 | |
| 645 | /*[clinic input] |
| 646 | signal.siginterrupt |
| 647 | |
| 648 | signalnum: int |
| 649 | flag: int |
| 650 | / |
| 651 | |
| 652 | Change system call restart behaviour. |
| 653 | |
| 654 | If flag is False, system calls will be restarted when interrupted by |
| 655 | signal sig, else system calls will be interrupted. |
| 656 | [clinic start generated code]*/ |
Christian Heimes | 8640e74 | 2008-02-23 16:23:06 +0000 | [diff] [blame] | 657 | |
| 658 | static PyObject * |
Serhiy Storchaka | 1a2b24f | 2016-07-07 17:35:15 +0300 | [diff] [blame] | 659 | signal_siginterrupt_impl(PyObject *module, int signalnum, int flag) |
| 660 | /*[clinic end generated code: output=063816243d85dd19 input=4160acacca3e2099]*/ |
Christian Heimes | 8640e74 | 2008-02-23 16:23:06 +0000 | [diff] [blame] | 661 | { |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 662 | if (signalnum < 1 || signalnum >= NSIG) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 663 | PyErr_SetString(PyExc_ValueError, |
| 664 | "signal number out of range"); |
| 665 | return NULL; |
| 666 | } |
Pablo Galindo | f9c5e3f | 2020-09-02 15:29:12 +0100 | [diff] [blame] | 667 | #ifdef HAVE_SIGACTION |
| 668 | struct sigaction act; |
| 669 | (void) sigaction(signalnum, NULL, &act); |
| 670 | if (flag) { |
| 671 | act.sa_flags &= ~SA_RESTART; |
| 672 | } |
| 673 | else { |
| 674 | act.sa_flags |= SA_RESTART; |
| 675 | } |
| 676 | if (sigaction(signalnum, &act, NULL) < 0) { |
| 677 | #else |
| 678 | if (siginterrupt(signalnum, flag) < 0) { |
| 679 | #endif |
Victor Stinner | 388196e | 2011-05-10 17:13:00 +0200 | [diff] [blame] | 680 | PyErr_SetFromErrno(PyExc_OSError); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 681 | return NULL; |
| 682 | } |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 683 | Py_RETURN_NONE; |
Christian Heimes | 8640e74 | 2008-02-23 16:23:06 +0000 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | #endif |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 687 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 688 | |
| 689 | static PyObject* |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 690 | signal_set_wakeup_fd(PyObject *self, PyObject *args, PyObject *kwds) |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 691 | { |
Victor Stinner | e134a7f | 2015-03-30 10:09:31 +0200 | [diff] [blame] | 692 | struct _Py_stat_struct status; |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 693 | static char *kwlist[] = { |
| 694 | "", "warn_on_full_buffer", NULL, |
| 695 | }; |
| 696 | int warn_on_full_buffer = 1; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 697 | #ifdef MS_WINDOWS |
| 698 | PyObject *fdobj; |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 699 | SOCKET_T sockfd, old_sockfd; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 700 | int res; |
| 701 | int res_size = sizeof res; |
| 702 | PyObject *mod; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 703 | int is_socket; |
| 704 | |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 705 | if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|$p:set_wakeup_fd", kwlist, |
| 706 | &fdobj, &warn_on_full_buffer)) |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 707 | return NULL; |
| 708 | |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 709 | sockfd = PyLong_AsSocket_t(fdobj); |
| 710 | if (sockfd == (SOCKET_T)(-1) && PyErr_Occurred()) |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 711 | return NULL; |
| 712 | #else |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 713 | int fd; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 714 | |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 715 | if (!PyArg_ParseTupleAndKeywords(args, kwds, "i|$p:set_wakeup_fd", kwlist, |
| 716 | &fd, &warn_on_full_buffer)) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 717 | return NULL; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 718 | #endif |
| 719 | |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 720 | PyThreadState *tstate = _PyThreadState_GET(); |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 721 | if (!_Py_ThreadCanHandleSignals(tstate->interp)) { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 722 | _PyErr_SetString(tstate, PyExc_ValueError, |
| 723 | "set_wakeup_fd only works in main thread " |
| 724 | "of the main interpreter"); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 725 | return NULL; |
| 726 | } |
Victor Stinner | 0bffc94 | 2014-07-21 16:28:54 +0200 | [diff] [blame] | 727 | |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 728 | #ifdef MS_WINDOWS |
| 729 | is_socket = 0; |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 730 | if (sockfd != INVALID_FD) { |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 731 | /* Import the _socket module to call WSAStartup() */ |
| 732 | mod = PyImport_ImportModuleNoBlock("_socket"); |
| 733 | if (mod == NULL) |
| 734 | return NULL; |
| 735 | Py_DECREF(mod); |
| 736 | |
| 737 | /* test the socket */ |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 738 | if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 739 | (char *)&res, &res_size) != 0) { |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 740 | int fd, err; |
| 741 | |
| 742 | err = WSAGetLastError(); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 743 | if (err != WSAENOTSOCK) { |
| 744 | PyErr_SetExcFromWindowsErr(PyExc_OSError, err); |
| 745 | return NULL; |
| 746 | } |
| 747 | |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 748 | fd = (int)sockfd; |
Steve Dower | 940f33a | 2016-09-08 11:21:54 -0700 | [diff] [blame] | 749 | if ((SOCKET_T)fd != sockfd) { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 750 | _PyErr_SetString(tstate, PyExc_ValueError, "invalid fd"); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 751 | return NULL; |
| 752 | } |
| 753 | |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 754 | if (_Py_fstat(fd, &status) != 0) { |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 755 | return NULL; |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 756 | } |
Victor Stinner | 3822760 | 2014-08-27 12:59:44 +0200 | [diff] [blame] | 757 | |
| 758 | /* on Windows, a file cannot be set to non-blocking mode */ |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 759 | } |
Victor Stinner | 3822760 | 2014-08-27 12:59:44 +0200 | [diff] [blame] | 760 | else { |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 761 | is_socket = 1; |
Victor Stinner | 3822760 | 2014-08-27 12:59:44 +0200 | [diff] [blame] | 762 | |
| 763 | /* Windows does not provide a function to test if a socket |
| 764 | is in non-blocking mode */ |
| 765 | } |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 766 | } |
| 767 | |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 768 | old_sockfd = wakeup.fd; |
| 769 | wakeup.fd = sockfd; |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 770 | wakeup.warn_on_full_buffer = warn_on_full_buffer; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 771 | wakeup.use_send = is_socket; |
| 772 | |
Victor Stinner | cf40a9e | 2015-02-12 16:34:54 +0100 | [diff] [blame] | 773 | if (old_sockfd != INVALID_FD) |
| 774 | return PyLong_FromSocket_t(old_sockfd); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 775 | else |
| 776 | return PyLong_FromLong(-1); |
| 777 | #else |
Victor Stinner | d18ccd1 | 2014-07-24 21:58:53 +0200 | [diff] [blame] | 778 | if (fd != -1) { |
Victor Stinner | 3822760 | 2014-08-27 12:59:44 +0200 | [diff] [blame] | 779 | int blocking; |
| 780 | |
Victor Stinner | e134a7f | 2015-03-30 10:09:31 +0200 | [diff] [blame] | 781 | if (_Py_fstat(fd, &status) != 0) |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 782 | return NULL; |
Victor Stinner | 3822760 | 2014-08-27 12:59:44 +0200 | [diff] [blame] | 783 | |
| 784 | blocking = _Py_get_blocking(fd); |
| 785 | if (blocking < 0) |
| 786 | return NULL; |
| 787 | if (blocking) { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 788 | _PyErr_Format(tstate, PyExc_ValueError, |
| 789 | "the fd %i must be in non-blocking mode", |
| 790 | fd); |
Victor Stinner | 3822760 | 2014-08-27 12:59:44 +0200 | [diff] [blame] | 791 | return NULL; |
| 792 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 793 | } |
Victor Stinner | 0bffc94 | 2014-07-21 16:28:54 +0200 | [diff] [blame] | 794 | |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 795 | int old_fd = wakeup.fd; |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 796 | wakeup.fd = fd; |
| 797 | wakeup.warn_on_full_buffer = warn_on_full_buffer; |
Victor Stinner | 0bffc94 | 2014-07-21 16:28:54 +0200 | [diff] [blame] | 798 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 799 | return PyLong_FromLong(old_fd); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 800 | #endif |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 801 | } |
| 802 | |
| 803 | PyDoc_STRVAR(set_wakeup_fd_doc, |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 804 | "set_wakeup_fd(fd, *, warn_on_full_buffer=True) -> fd\n\ |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 805 | \n\ |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 806 | Sets the fd to be written to (with the signal number) when a signal\n\ |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 807 | comes in. A library can use this to wakeup select or poll.\n\ |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 808 | The previous fd or -1 is returned.\n\ |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 809 | \n\ |
| 810 | The fd must be non-blocking."); |
| 811 | |
| 812 | /* C API for the same, without all the error checking */ |
| 813 | int |
| 814 | PySignal_SetWakeupFd(int fd) |
| 815 | { |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 816 | if (fd < 0) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 817 | fd = -1; |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 818 | } |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 819 | |
| 820 | #ifdef MS_WINDOWS |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 821 | int old_fd = Py_SAFE_DOWNCAST(wakeup.fd, SOCKET_T, int); |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 822 | #else |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 823 | int old_fd = wakeup.fd; |
Victor Stinner | 1151710 | 2014-07-29 23:31:34 +0200 | [diff] [blame] | 824 | #endif |
Nathaniel J. Smith | 902ab80 | 2017-12-17 20:10:18 -0800 | [diff] [blame] | 825 | wakeup.fd = fd; |
| 826 | wakeup.warn_on_full_buffer = 1; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 827 | return old_fd; |
Christian Heimes | 5fb7c2a | 2007-12-24 08:52:31 +0000 | [diff] [blame] | 828 | } |
| 829 | |
| 830 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 831 | #ifdef HAVE_SETITIMER |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 832 | |
| 833 | /*[clinic input] |
| 834 | signal.setitimer |
| 835 | |
| 836 | which: int |
Victor Stinner | ef611c9 | 2017-10-13 13:49:43 -0700 | [diff] [blame] | 837 | seconds: object |
| 838 | interval: object(c_default="NULL") = 0.0 |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 839 | / |
| 840 | |
| 841 | Sets given itimer (one of ITIMER_REAL, ITIMER_VIRTUAL or ITIMER_PROF). |
| 842 | |
| 843 | The timer will fire after value seconds and after that every interval seconds. |
| 844 | The itimer can be cleared by setting seconds to zero. |
| 845 | |
| 846 | Returns old values as a tuple: (delay, interval). |
| 847 | [clinic start generated code]*/ |
| 848 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 849 | static PyObject * |
Victor Stinner | ef611c9 | 2017-10-13 13:49:43 -0700 | [diff] [blame] | 850 | signal_setitimer_impl(PyObject *module, int which, PyObject *seconds, |
| 851 | PyObject *interval) |
| 852 | /*[clinic end generated code: output=65f9dcbddc35527b input=de43daf194e6f66f]*/ |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 853 | { |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 854 | struct itimerval new; |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 855 | |
Victor Stinner | ef611c9 | 2017-10-13 13:49:43 -0700 | [diff] [blame] | 856 | if (timeval_from_double(seconds, &new.it_value) < 0) { |
| 857 | return NULL; |
| 858 | } |
| 859 | if (timeval_from_double(interval, &new.it_interval) < 0) { |
| 860 | return NULL; |
| 861 | } |
| 862 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 863 | /* Let OS check "which" value */ |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 864 | struct itimerval old; |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 865 | if (setitimer(which, &new, &old) != 0) { |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 866 | PyErr_SetFromErrno(ItimerError); |
| 867 | return NULL; |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 868 | } |
| 869 | |
| 870 | return itimer_retval(&old); |
| 871 | } |
| 872 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 873 | #endif |
| 874 | |
| 875 | |
| 876 | #ifdef HAVE_GETITIMER |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 877 | |
| 878 | /*[clinic input] |
| 879 | signal.getitimer |
| 880 | |
| 881 | which: int |
| 882 | / |
| 883 | |
| 884 | Returns current value of given itimer. |
| 885 | [clinic start generated code]*/ |
| 886 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 887 | static PyObject * |
Serhiy Storchaka | 1a2b24f | 2016-07-07 17:35:15 +0300 | [diff] [blame] | 888 | signal_getitimer_impl(PyObject *module, int which) |
| 889 | /*[clinic end generated code: output=9e053175d517db40 input=f7d21d38f3490627]*/ |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 890 | { |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 891 | struct itimerval old; |
| 892 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 893 | if (getitimer(which, &old) != 0) { |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 894 | PyErr_SetFromErrno(ItimerError); |
| 895 | return NULL; |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | return itimer_retval(&old); |
| 899 | } |
| 900 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 901 | #endif |
| 902 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 903 | #if defined(PYPTHREAD_SIGMASK) || defined(HAVE_SIGPENDING) |
Victor Stinner | 35b300c | 2011-05-04 13:20:35 +0200 | [diff] [blame] | 904 | static PyObject* |
| 905 | sigset_to_set(sigset_t mask) |
| 906 | { |
| 907 | PyObject *signum, *result; |
| 908 | int sig; |
| 909 | |
| 910 | result = PySet_New(0); |
| 911 | if (result == NULL) |
| 912 | return NULL; |
| 913 | |
| 914 | for (sig = 1; sig < NSIG; sig++) { |
| 915 | if (sigismember(&mask, sig) != 1) |
| 916 | continue; |
| 917 | |
| 918 | /* Handle the case where it is a member by adding the signal to |
| 919 | the result list. Ignore the other cases because they mean the |
| 920 | signal isn't a member of the mask or the signal was invalid, |
| 921 | and an invalid signal must have been our fault in constructing |
| 922 | the loop boundaries. */ |
| 923 | signum = PyLong_FromLong(sig); |
| 924 | if (signum == NULL) { |
| 925 | Py_DECREF(result); |
| 926 | return NULL; |
| 927 | } |
| 928 | if (PySet_Add(result, signum) == -1) { |
| 929 | Py_DECREF(signum); |
| 930 | Py_DECREF(result); |
| 931 | return NULL; |
| 932 | } |
| 933 | Py_DECREF(signum); |
| 934 | } |
| 935 | return result; |
| 936 | } |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 937 | #endif |
Victor Stinner | 35b300c | 2011-05-04 13:20:35 +0200 | [diff] [blame] | 938 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 939 | #ifdef PYPTHREAD_SIGMASK |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 940 | |
| 941 | /*[clinic input] |
| 942 | signal.pthread_sigmask |
| 943 | |
| 944 | how: int |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 945 | mask: sigset_t |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 946 | / |
| 947 | |
| 948 | Fetch and/or change the signal mask of the calling thread. |
| 949 | [clinic start generated code]*/ |
| 950 | |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 951 | static PyObject * |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 952 | signal_pthread_sigmask_impl(PyObject *module, int how, sigset_t mask) |
| 953 | /*[clinic end generated code: output=0562c0fb192981a8 input=85bcebda442fa77f]*/ |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 954 | { |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 955 | sigset_t previous; |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 956 | int err; |
| 957 | |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 958 | err = pthread_sigmask(how, &mask, &previous); |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 959 | if (err != 0) { |
| 960 | errno = err; |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 961 | PyErr_SetFromErrno(PyExc_OSError); |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 962 | return NULL; |
| 963 | } |
| 964 | |
Victor Stinner | d0e516d | 2011-05-03 14:57:12 +0200 | [diff] [blame] | 965 | /* if signals was unblocked, signal handlers have been called */ |
| 966 | if (PyErr_CheckSignals()) |
| 967 | return NULL; |
| 968 | |
Victor Stinner | 35b300c | 2011-05-04 13:20:35 +0200 | [diff] [blame] | 969 | return sigset_to_set(previous); |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 970 | } |
| 971 | |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 972 | #endif /* #ifdef PYPTHREAD_SIGMASK */ |
| 973 | |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 974 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 975 | #ifdef HAVE_SIGPENDING |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 976 | |
| 977 | /*[clinic input] |
| 978 | signal.sigpending |
| 979 | |
| 980 | Examine pending signals. |
| 981 | |
| 982 | Returns a set of signal numbers that are pending for delivery to |
| 983 | the calling thread. |
| 984 | [clinic start generated code]*/ |
| 985 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 986 | static PyObject * |
Serhiy Storchaka | 1a2b24f | 2016-07-07 17:35:15 +0300 | [diff] [blame] | 987 | signal_sigpending_impl(PyObject *module) |
| 988 | /*[clinic end generated code: output=53375ffe89325022 input=e0036c016f874e29]*/ |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 989 | { |
| 990 | int err; |
| 991 | sigset_t mask; |
| 992 | err = sigpending(&mask); |
| 993 | if (err) |
| 994 | return PyErr_SetFromErrno(PyExc_OSError); |
| 995 | return sigset_to_set(mask); |
| 996 | } |
| 997 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 998 | #endif /* #ifdef HAVE_SIGPENDING */ |
| 999 | |
| 1000 | |
| 1001 | #ifdef HAVE_SIGWAIT |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1002 | |
| 1003 | /*[clinic input] |
| 1004 | signal.sigwait |
| 1005 | |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1006 | sigset: sigset_t |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1007 | / |
| 1008 | |
| 1009 | Wait for a signal. |
| 1010 | |
| 1011 | Suspend execution of the calling thread until the delivery of one of the |
| 1012 | signals specified in the signal set sigset. The function accepts the signal |
| 1013 | and returns the signal number. |
| 1014 | [clinic start generated code]*/ |
| 1015 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1016 | static PyObject * |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1017 | signal_sigwait_impl(PyObject *module, sigset_t sigset) |
| 1018 | /*[clinic end generated code: output=f43770699d682f96 input=a6fbd47b1086d119]*/ |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1019 | { |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1020 | int err, signum; |
| 1021 | |
Victor Stinner | 10c30d6 | 2011-06-10 01:39:53 +0200 | [diff] [blame] | 1022 | Py_BEGIN_ALLOW_THREADS |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1023 | err = sigwait(&sigset, &signum); |
Victor Stinner | 10c30d6 | 2011-06-10 01:39:53 +0200 | [diff] [blame] | 1024 | Py_END_ALLOW_THREADS |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1025 | if (err) { |
| 1026 | errno = err; |
| 1027 | return PyErr_SetFromErrno(PyExc_OSError); |
| 1028 | } |
| 1029 | |
| 1030 | return PyLong_FromLong(signum); |
| 1031 | } |
| 1032 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1033 | #endif /* #ifdef HAVE_SIGWAIT */ |
| 1034 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1035 | |
Antoine Pitrou | 9d3627e | 2018-05-04 13:00:50 +0200 | [diff] [blame] | 1036 | #if defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS) |
| 1037 | |
| 1038 | /*[clinic input] |
| 1039 | signal.valid_signals |
| 1040 | |
| 1041 | Return a set of valid signal numbers on this platform. |
| 1042 | |
| 1043 | The signal numbers returned by this function can be safely passed to |
| 1044 | functions like `pthread_sigmask`. |
| 1045 | [clinic start generated code]*/ |
| 1046 | |
| 1047 | static PyObject * |
| 1048 | signal_valid_signals_impl(PyObject *module) |
| 1049 | /*[clinic end generated code: output=1609cffbcfcf1314 input=86a3717ff25288f2]*/ |
| 1050 | { |
| 1051 | #ifdef MS_WINDOWS |
| 1052 | #ifdef SIGBREAK |
| 1053 | PyObject *tup = Py_BuildValue("(iiiiiii)", SIGABRT, SIGBREAK, SIGFPE, |
| 1054 | SIGILL, SIGINT, SIGSEGV, SIGTERM); |
| 1055 | #else |
| 1056 | PyObject *tup = Py_BuildValue("(iiiiii)", SIGABRT, SIGFPE, SIGILL, |
| 1057 | SIGINT, SIGSEGV, SIGTERM); |
| 1058 | #endif |
| 1059 | if (tup == NULL) { |
| 1060 | return NULL; |
| 1061 | } |
| 1062 | PyObject *set = PySet_New(tup); |
| 1063 | Py_DECREF(tup); |
| 1064 | return set; |
| 1065 | #else |
| 1066 | sigset_t mask; |
| 1067 | if (sigemptyset(&mask) || sigfillset(&mask)) { |
| 1068 | return PyErr_SetFromErrno(PyExc_OSError); |
| 1069 | } |
| 1070 | return sigset_to_set(mask); |
| 1071 | #endif |
| 1072 | } |
| 1073 | |
| 1074 | #endif /* #if defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS) */ |
| 1075 | |
| 1076 | |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1077 | #if defined(HAVE_SIGWAITINFO) || defined(HAVE_SIGTIMEDWAIT) |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1078 | static PyStructSequence_Field struct_siginfo_fields[] = { |
| 1079 | {"si_signo", "signal number"}, |
| 1080 | {"si_code", "signal code"}, |
| 1081 | {"si_errno", "errno associated with this signal"}, |
| 1082 | {"si_pid", "sending process ID"}, |
| 1083 | {"si_uid", "real user ID of sending process"}, |
| 1084 | {"si_status", "exit value or signal"}, |
| 1085 | {"si_band", "band event for SIGPOLL"}, |
| 1086 | {0} |
| 1087 | }; |
| 1088 | |
| 1089 | PyDoc_STRVAR(struct_siginfo__doc__, |
| 1090 | "struct_siginfo: Result from sigwaitinfo or sigtimedwait.\n\n\ |
| 1091 | This object may be accessed either as a tuple of\n\ |
| 1092 | (si_signo, si_code, si_errno, si_pid, si_uid, si_status, si_band),\n\ |
| 1093 | or via the attributes si_signo, si_code, and so on."); |
| 1094 | |
| 1095 | static PyStructSequence_Desc struct_siginfo_desc = { |
| 1096 | "signal.struct_siginfo", /* name */ |
| 1097 | struct_siginfo__doc__, /* doc */ |
| 1098 | struct_siginfo_fields, /* fields */ |
| 1099 | 7 /* n_in_sequence */ |
| 1100 | }; |
| 1101 | |
| 1102 | static PyTypeObject SiginfoType; |
| 1103 | |
| 1104 | static PyObject * |
| 1105 | fill_siginfo(siginfo_t *si) |
| 1106 | { |
| 1107 | PyObject *result = PyStructSequence_New(&SiginfoType); |
| 1108 | if (!result) |
| 1109 | return NULL; |
| 1110 | |
| 1111 | PyStructSequence_SET_ITEM(result, 0, PyLong_FromLong((long)(si->si_signo))); |
| 1112 | PyStructSequence_SET_ITEM(result, 1, PyLong_FromLong((long)(si->si_code))); |
Victor Stinner | 09532fe | 2019-05-10 23:39:09 +0200 | [diff] [blame] | 1113 | #ifdef __VXWORKS__ |
pxinwr | 8b5bdda | 2019-03-14 01:18:25 +0800 | [diff] [blame] | 1114 | PyStructSequence_SET_ITEM(result, 2, PyLong_FromLong(0L)); |
| 1115 | PyStructSequence_SET_ITEM(result, 3, PyLong_FromLong(0L)); |
| 1116 | PyStructSequence_SET_ITEM(result, 4, PyLong_FromLong(0L)); |
| 1117 | PyStructSequence_SET_ITEM(result, 5, PyLong_FromLong(0L)); |
Victor Stinner | 09532fe | 2019-05-10 23:39:09 +0200 | [diff] [blame] | 1118 | #else |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1119 | PyStructSequence_SET_ITEM(result, 2, PyLong_FromLong((long)(si->si_errno))); |
| 1120 | PyStructSequence_SET_ITEM(result, 3, PyLong_FromPid(si->si_pid)); |
Serhiy Storchaka | 7cf5599 | 2013-02-10 21:56:49 +0200 | [diff] [blame] | 1121 | PyStructSequence_SET_ITEM(result, 4, _PyLong_FromUid(si->si_uid)); |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1122 | PyStructSequence_SET_ITEM(result, 5, |
| 1123 | PyLong_FromLong((long)(si->si_status))); |
Victor Stinner | 09532fe | 2019-05-10 23:39:09 +0200 | [diff] [blame] | 1124 | #endif |
Zachary Ware | 6a6967e | 2016-10-01 00:47:27 -0500 | [diff] [blame] | 1125 | #ifdef HAVE_SIGINFO_T_SI_BAND |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1126 | PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(si->si_band)); |
Zachary Ware | 6a6967e | 2016-10-01 00:47:27 -0500 | [diff] [blame] | 1127 | #else |
| 1128 | PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(0L)); |
| 1129 | #endif |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1130 | if (PyErr_Occurred()) { |
| 1131 | Py_DECREF(result); |
| 1132 | return NULL; |
| 1133 | } |
| 1134 | |
| 1135 | return result; |
| 1136 | } |
| 1137 | #endif |
| 1138 | |
| 1139 | #ifdef HAVE_SIGWAITINFO |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1140 | |
| 1141 | /*[clinic input] |
| 1142 | signal.sigwaitinfo |
| 1143 | |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1144 | sigset: sigset_t |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1145 | / |
| 1146 | |
| 1147 | Wait synchronously until one of the signals in *sigset* is delivered. |
| 1148 | |
| 1149 | Returns a struct_siginfo containing information about the signal. |
| 1150 | [clinic start generated code]*/ |
| 1151 | |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1152 | static PyObject * |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1153 | signal_sigwaitinfo_impl(PyObject *module, sigset_t sigset) |
| 1154 | /*[clinic end generated code: output=1eb2f1fa236fdbca input=3d1a7e1f27fc664c]*/ |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1155 | { |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1156 | siginfo_t si; |
| 1157 | int err; |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1158 | int async_err = 0; |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1159 | |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1160 | do { |
| 1161 | Py_BEGIN_ALLOW_THREADS |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1162 | err = sigwaitinfo(&sigset, &si); |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1163 | Py_END_ALLOW_THREADS |
| 1164 | } while (err == -1 |
| 1165 | && errno == EINTR && !(async_err = PyErr_CheckSignals())); |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1166 | if (err == -1) |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1167 | return (!async_err) ? PyErr_SetFromErrno(PyExc_OSError) : NULL; |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1168 | |
| 1169 | return fill_siginfo(&si); |
| 1170 | } |
| 1171 | |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1172 | #endif /* #ifdef HAVE_SIGWAITINFO */ |
| 1173 | |
| 1174 | #ifdef HAVE_SIGTIMEDWAIT |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1175 | |
| 1176 | /*[clinic input] |
| 1177 | signal.sigtimedwait |
| 1178 | |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1179 | sigset: sigset_t |
Serhiy Storchaka | 6b680cd | 2015-05-16 15:57:56 +0300 | [diff] [blame] | 1180 | timeout as timeout_obj: object |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1181 | / |
| 1182 | |
| 1183 | Like sigwaitinfo(), but with a timeout. |
| 1184 | |
| 1185 | The timeout is specified in seconds, with floating point numbers allowed. |
| 1186 | [clinic start generated code]*/ |
| 1187 | |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1188 | static PyObject * |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1189 | signal_sigtimedwait_impl(PyObject *module, sigset_t sigset, |
Serhiy Storchaka | 6b680cd | 2015-05-16 15:57:56 +0300 | [diff] [blame] | 1190 | PyObject *timeout_obj) |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1191 | /*[clinic end generated code: output=59c8971e8ae18a64 input=87fd39237cf0b7ba]*/ |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1192 | { |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1193 | struct timespec ts; |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1194 | siginfo_t si; |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1195 | int res; |
Victor Stinner | 34dc0f4 | 2015-03-27 18:19:03 +0100 | [diff] [blame] | 1196 | _PyTime_t timeout, deadline, monotonic; |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1197 | |
Victor Stinner | 869e177 | 2015-03-30 03:49:14 +0200 | [diff] [blame] | 1198 | if (_PyTime_FromSecondsObject(&timeout, |
| 1199 | timeout_obj, _PyTime_ROUND_CEILING) < 0) |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1200 | return NULL; |
| 1201 | |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1202 | if (timeout < 0) { |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1203 | PyErr_SetString(PyExc_ValueError, "timeout must be non-negative"); |
| 1204 | return NULL; |
| 1205 | } |
| 1206 | |
Victor Stinner | 34dc0f4 | 2015-03-27 18:19:03 +0100 | [diff] [blame] | 1207 | deadline = _PyTime_GetMonotonicClock() + timeout; |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1208 | |
| 1209 | do { |
Victor Stinner | 34dc0f4 | 2015-03-27 18:19:03 +0100 | [diff] [blame] | 1210 | if (_PyTime_AsTimespec(timeout, &ts) < 0) |
| 1211 | return NULL; |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1212 | |
| 1213 | Py_BEGIN_ALLOW_THREADS |
Serhiy Storchaka | d54cfb1 | 2018-05-08 07:48:50 +0300 | [diff] [blame] | 1214 | res = sigtimedwait(&sigset, &si, &ts); |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1215 | Py_END_ALLOW_THREADS |
| 1216 | |
| 1217 | if (res != -1) |
| 1218 | break; |
| 1219 | |
| 1220 | if (errno != EINTR) { |
| 1221 | if (errno == EAGAIN) |
| 1222 | Py_RETURN_NONE; |
| 1223 | else |
| 1224 | return PyErr_SetFromErrno(PyExc_OSError); |
| 1225 | } |
| 1226 | |
| 1227 | /* sigtimedwait() was interrupted by a signal (EINTR) */ |
| 1228 | if (PyErr_CheckSignals()) |
| 1229 | return NULL; |
| 1230 | |
Victor Stinner | 34dc0f4 | 2015-03-27 18:19:03 +0100 | [diff] [blame] | 1231 | monotonic = _PyTime_GetMonotonicClock(); |
| 1232 | timeout = deadline - monotonic; |
Victor Stinner | 6aa446c | 2015-03-30 21:33:51 +0200 | [diff] [blame] | 1233 | if (timeout < 0) |
Victor Stinner | a453cd8 | 2015-03-20 12:54:28 +0100 | [diff] [blame] | 1234 | break; |
| 1235 | } while (1); |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1236 | |
| 1237 | return fill_siginfo(&si); |
| 1238 | } |
| 1239 | |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1240 | #endif /* #ifdef HAVE_SIGTIMEDWAIT */ |
| 1241 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1242 | |
Antoine Pitrou | a6a4dc8 | 2017-09-07 18:56:24 +0200 | [diff] [blame] | 1243 | #if defined(HAVE_PTHREAD_KILL) |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1244 | |
| 1245 | /*[clinic input] |
| 1246 | signal.pthread_kill |
| 1247 | |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 1248 | thread_id: unsigned_long(bitwise=True) |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1249 | signalnum: int |
| 1250 | / |
| 1251 | |
| 1252 | Send a signal to a thread. |
| 1253 | [clinic start generated code]*/ |
| 1254 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1255 | static PyObject * |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 1256 | signal_pthread_kill_impl(PyObject *module, unsigned long thread_id, |
| 1257 | int signalnum) |
| 1258 | /*[clinic end generated code: output=7629919b791bc27f input=1d901f2c7bb544ff]*/ |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1259 | { |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1260 | int err; |
| 1261 | |
Saiyang Gou | 7514f4f | 2020-02-12 23:47:42 -0800 | [diff] [blame] | 1262 | if (PySys_Audit("signal.pthread_kill", "ki", thread_id, signalnum) < 0) { |
| 1263 | return NULL; |
| 1264 | } |
| 1265 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1266 | err = pthread_kill((pthread_t)thread_id, signalnum); |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1267 | if (err != 0) { |
| 1268 | errno = err; |
| 1269 | PyErr_SetFromErrno(PyExc_OSError); |
| 1270 | return NULL; |
| 1271 | } |
| 1272 | |
| 1273 | /* the signal may have been send to the current thread */ |
| 1274 | if (PyErr_CheckSignals()) |
| 1275 | return NULL; |
| 1276 | |
| 1277 | Py_RETURN_NONE; |
| 1278 | } |
| 1279 | |
Antoine Pitrou | a6a4dc8 | 2017-09-07 18:56:24 +0200 | [diff] [blame] | 1280 | #endif /* #if defined(HAVE_PTHREAD_KILL) */ |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1281 | |
| 1282 | |
Benjamin Peterson | 7483451 | 2019-11-19 20:39:14 -0800 | [diff] [blame] | 1283 | #if defined(__linux__) && defined(__NR_pidfd_send_signal) |
| 1284 | /*[clinic input] |
| 1285 | signal.pidfd_send_signal |
| 1286 | |
| 1287 | pidfd: int |
| 1288 | signalnum: int |
| 1289 | siginfo: object = None |
| 1290 | flags: int = 0 |
| 1291 | / |
| 1292 | |
| 1293 | Send a signal to a process referred to by a pid file descriptor. |
| 1294 | [clinic start generated code]*/ |
| 1295 | |
| 1296 | static PyObject * |
| 1297 | signal_pidfd_send_signal_impl(PyObject *module, int pidfd, int signalnum, |
| 1298 | PyObject *siginfo, int flags) |
| 1299 | /*[clinic end generated code: output=2d59f04a75d9cbdf input=2a6543a1f4ac2000]*/ |
| 1300 | |
| 1301 | { |
| 1302 | if (siginfo != Py_None) { |
| 1303 | PyErr_SetString(PyExc_TypeError, "siginfo must be None"); |
| 1304 | return NULL; |
| 1305 | } |
| 1306 | if (syscall(__NR_pidfd_send_signal, pidfd, signalnum, NULL, flags) < 0) { |
| 1307 | PyErr_SetFromErrno(PyExc_OSError); |
| 1308 | return NULL; |
| 1309 | } |
| 1310 | Py_RETURN_NONE; |
| 1311 | } |
| 1312 | #endif |
| 1313 | |
| 1314 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 1315 | |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1316 | /* List of functions defined in the module -- some of the methoddefs are |
| 1317 | defined to nothing if the corresponding C function is not available. */ |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 1318 | static PyMethodDef signal_methods[] = { |
Serhiy Storchaka | b0689ae | 2020-07-12 19:15:20 +0300 | [diff] [blame] | 1319 | SIGNAL_DEFAULT_INT_HANDLER_METHODDEF |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1320 | SIGNAL_ALARM_METHODDEF |
| 1321 | SIGNAL_SETITIMER_METHODDEF |
| 1322 | SIGNAL_GETITIMER_METHODDEF |
| 1323 | SIGNAL_SIGNAL_METHODDEF |
Vladimir Matveev | c24c6c2 | 2019-01-08 01:58:25 -0800 | [diff] [blame] | 1324 | SIGNAL_RAISE_SIGNAL_METHODDEF |
Antoine Pietri | 5d2a27d | 2018-03-12 14:42:34 +0100 | [diff] [blame] | 1325 | SIGNAL_STRSIGNAL_METHODDEF |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1326 | SIGNAL_GETSIGNAL_METHODDEF |
Serhiy Storchaka | 62be742 | 2018-11-27 13:27:31 +0200 | [diff] [blame] | 1327 | {"set_wakeup_fd", (PyCFunction)(void(*)(void))signal_set_wakeup_fd, METH_VARARGS | METH_KEYWORDS, set_wakeup_fd_doc}, |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1328 | SIGNAL_SIGINTERRUPT_METHODDEF |
| 1329 | SIGNAL_PAUSE_METHODDEF |
Benjamin Peterson | 7483451 | 2019-11-19 20:39:14 -0800 | [diff] [blame] | 1330 | SIGNAL_PIDFD_SEND_SIGNAL_METHODDEF |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1331 | SIGNAL_PTHREAD_KILL_METHODDEF |
| 1332 | SIGNAL_PTHREAD_SIGMASK_METHODDEF |
| 1333 | SIGNAL_SIGPENDING_METHODDEF |
| 1334 | SIGNAL_SIGWAIT_METHODDEF |
| 1335 | SIGNAL_SIGWAITINFO_METHODDEF |
| 1336 | SIGNAL_SIGTIMEDWAIT_METHODDEF |
Antoine Pitrou | 9d3627e | 2018-05-04 13:00:50 +0200 | [diff] [blame] | 1337 | #if defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS) |
| 1338 | SIGNAL_VALID_SIGNALS_METHODDEF |
| 1339 | #endif |
Tal Einat | c7027b7 | 2015-05-16 14:14:49 +0300 | [diff] [blame] | 1340 | {NULL, NULL} /* sentinel */ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1341 | }; |
| 1342 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 1343 | |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 1344 | PyDoc_STRVAR(module_doc, |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 1345 | "This module provides mechanisms to use signal handlers in Python.\n\ |
| 1346 | \n\ |
| 1347 | Functions:\n\ |
| 1348 | \n\ |
| 1349 | alarm() -- cause SIGALRM after a specified time [Unix only]\n\ |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 1350 | setitimer() -- cause a signal (described below) after a specified\n\ |
| 1351 | float time and the timer may restart then [Unix only]\n\ |
| 1352 | getitimer() -- get current value of timer [Unix only]\n\ |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 1353 | signal() -- set the action for a given signal\n\ |
| 1354 | getsignal() -- get the signal action for a given signal\n\ |
| 1355 | pause() -- wait until a signal arrives [Unix only]\n\ |
| 1356 | default_int_handler() -- default SIGINT handler\n\ |
| 1357 | \n\ |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 1358 | signal constants:\n\ |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 1359 | SIG_DFL -- used to refer to the system default handler\n\ |
| 1360 | SIG_IGN -- used to ignore the signal\n\ |
| 1361 | NSIG -- number of defined signals\n\ |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 1362 | SIGINT, SIGTERM, etc. -- signal numbers\n\ |
| 1363 | \n\ |
Martin v. Löwis | 823725e | 2008-03-24 13:39:54 +0000 | [diff] [blame] | 1364 | itimer constants:\n\ |
| 1365 | ITIMER_REAL -- decrements in real time, and delivers SIGALRM upon\n\ |
| 1366 | expiration\n\ |
| 1367 | ITIMER_VIRTUAL -- decrements only when the process is executing,\n\ |
| 1368 | and delivers SIGVTALRM upon expiration\n\ |
| 1369 | ITIMER_PROF -- decrements both when the process is executing and\n\ |
| 1370 | when the system is executing on behalf of the process.\n\ |
| 1371 | Coupled with ITIMER_VIRTUAL, this timer is usually\n\ |
| 1372 | used to profile the time spent by the application\n\ |
| 1373 | in user and kernel space. SIGPROF is delivered upon\n\ |
| 1374 | expiration.\n\ |
| 1375 | \n\n\ |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 1376 | *** IMPORTANT NOTICE ***\n\ |
| 1377 | A signal handler function is called with two arguments:\n\ |
Martin v. Löwis | 14f8b4c | 2002-06-13 20:33:02 +0000 | [diff] [blame] | 1378 | 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] | 1379 | |
Martin v. Löwis | 1a21451 | 2008-06-11 05:26:20 +0000 | [diff] [blame] | 1380 | |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1381 | |
| 1382 | static int |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1383 | signal_add_constants(PyObject *module) |
| 1384 | { |
| 1385 | #define ADD_INT_MACRO(macro) \ |
| 1386 | if (PyModule_AddIntConstant(module, #macro, macro) < 0) { \ |
| 1387 | return -1; \ |
| 1388 | } |
| 1389 | |
| 1390 | ADD_INT_MACRO(NSIG); |
| 1391 | |
| 1392 | // SIG_xxx pthread_sigmask() constants |
| 1393 | #ifdef SIG_BLOCK |
| 1394 | ADD_INT_MACRO(SIG_BLOCK); |
| 1395 | #endif |
| 1396 | #ifdef SIG_UNBLOCK |
| 1397 | ADD_INT_MACRO(SIG_UNBLOCK); |
| 1398 | #endif |
| 1399 | #ifdef SIG_SETMASK |
| 1400 | ADD_INT_MACRO(SIG_SETMASK); |
| 1401 | #endif |
| 1402 | |
| 1403 | // SIGxxx signal number constants |
| 1404 | #ifdef SIGHUP |
| 1405 | ADD_INT_MACRO(SIGHUP); |
| 1406 | #endif |
| 1407 | #ifdef SIGINT |
| 1408 | ADD_INT_MACRO(SIGINT); |
| 1409 | #endif |
| 1410 | #ifdef SIGBREAK |
| 1411 | ADD_INT_MACRO(SIGBREAK); |
| 1412 | #endif |
| 1413 | #ifdef SIGQUIT |
| 1414 | ADD_INT_MACRO(SIGQUIT); |
| 1415 | #endif |
| 1416 | #ifdef SIGILL |
| 1417 | ADD_INT_MACRO(SIGILL); |
| 1418 | #endif |
| 1419 | #ifdef SIGTRAP |
| 1420 | ADD_INT_MACRO(SIGTRAP); |
| 1421 | #endif |
| 1422 | #ifdef SIGIOT |
| 1423 | ADD_INT_MACRO(SIGIOT); |
| 1424 | #endif |
| 1425 | #ifdef SIGABRT |
| 1426 | ADD_INT_MACRO(SIGABRT); |
| 1427 | #endif |
| 1428 | #ifdef SIGEMT |
| 1429 | ADD_INT_MACRO(SIGEMT); |
| 1430 | #endif |
| 1431 | #ifdef SIGFPE |
| 1432 | ADD_INT_MACRO(SIGFPE); |
| 1433 | #endif |
| 1434 | #ifdef SIGKILL |
| 1435 | ADD_INT_MACRO(SIGKILL); |
| 1436 | #endif |
| 1437 | #ifdef SIGBUS |
| 1438 | ADD_INT_MACRO(SIGBUS); |
| 1439 | #endif |
| 1440 | #ifdef SIGSEGV |
| 1441 | ADD_INT_MACRO(SIGSEGV); |
| 1442 | #endif |
| 1443 | #ifdef SIGSYS |
| 1444 | ADD_INT_MACRO(SIGSYS); |
| 1445 | #endif |
| 1446 | #ifdef SIGPIPE |
| 1447 | ADD_INT_MACRO(SIGPIPE); |
| 1448 | #endif |
| 1449 | #ifdef SIGALRM |
| 1450 | ADD_INT_MACRO(SIGALRM); |
| 1451 | #endif |
| 1452 | #ifdef SIGTERM |
| 1453 | ADD_INT_MACRO(SIGTERM); |
| 1454 | #endif |
| 1455 | #ifdef SIGUSR1 |
| 1456 | ADD_INT_MACRO(SIGUSR1); |
| 1457 | #endif |
| 1458 | #ifdef SIGUSR2 |
| 1459 | ADD_INT_MACRO(SIGUSR2); |
| 1460 | #endif |
| 1461 | #ifdef SIGCLD |
| 1462 | ADD_INT_MACRO(SIGCLD); |
| 1463 | #endif |
| 1464 | #ifdef SIGCHLD |
| 1465 | ADD_INT_MACRO(SIGCHLD); |
| 1466 | #endif |
| 1467 | #ifdef SIGPWR |
| 1468 | ADD_INT_MACRO(SIGPWR); |
| 1469 | #endif |
| 1470 | #ifdef SIGIO |
| 1471 | ADD_INT_MACRO(SIGIO); |
| 1472 | #endif |
| 1473 | #ifdef SIGURG |
| 1474 | ADD_INT_MACRO(SIGURG); |
| 1475 | #endif |
| 1476 | #ifdef SIGWINCH |
| 1477 | ADD_INT_MACRO(SIGWINCH); |
| 1478 | #endif |
| 1479 | #ifdef SIGPOLL |
| 1480 | ADD_INT_MACRO(SIGPOLL); |
| 1481 | #endif |
| 1482 | #ifdef SIGSTOP |
| 1483 | ADD_INT_MACRO(SIGSTOP); |
| 1484 | #endif |
| 1485 | #ifdef SIGTSTP |
| 1486 | ADD_INT_MACRO(SIGTSTP); |
| 1487 | #endif |
| 1488 | #ifdef SIGCONT |
| 1489 | ADD_INT_MACRO(SIGCONT); |
| 1490 | #endif |
| 1491 | #ifdef SIGTTIN |
| 1492 | ADD_INT_MACRO(SIGTTIN); |
| 1493 | #endif |
| 1494 | #ifdef SIGTTOU |
| 1495 | ADD_INT_MACRO(SIGTTOU); |
| 1496 | #endif |
| 1497 | #ifdef SIGVTALRM |
| 1498 | ADD_INT_MACRO(SIGVTALRM); |
| 1499 | #endif |
| 1500 | #ifdef SIGPROF |
| 1501 | ADD_INT_MACRO(SIGPROF); |
| 1502 | #endif |
| 1503 | #ifdef SIGXCPU |
| 1504 | ADD_INT_MACRO(SIGXCPU); |
| 1505 | #endif |
| 1506 | #ifdef SIGXFSZ |
| 1507 | ADD_INT_MACRO(SIGXFSZ); |
| 1508 | #endif |
| 1509 | #ifdef SIGRTMIN |
| 1510 | ADD_INT_MACRO(SIGRTMIN); |
| 1511 | #endif |
| 1512 | #ifdef SIGRTMAX |
| 1513 | ADD_INT_MACRO(SIGRTMAX); |
| 1514 | #endif |
| 1515 | #ifdef SIGINFO |
| 1516 | ADD_INT_MACRO(SIGINFO); |
| 1517 | #endif |
| 1518 | |
| 1519 | // ITIMER_xxx constants |
| 1520 | #ifdef ITIMER_REAL |
| 1521 | ADD_INT_MACRO(ITIMER_REAL); |
| 1522 | #endif |
| 1523 | #ifdef ITIMER_VIRTUAL |
| 1524 | ADD_INT_MACRO(ITIMER_VIRTUAL); |
| 1525 | #endif |
| 1526 | #ifdef ITIMER_PROF |
| 1527 | ADD_INT_MACRO(ITIMER_PROF); |
| 1528 | #endif |
| 1529 | |
| 1530 | // CTRL_xxx Windows signals |
| 1531 | #ifdef CTRL_C_EVENT |
| 1532 | ADD_INT_MACRO(CTRL_C_EVENT); |
| 1533 | #endif |
| 1534 | #ifdef CTRL_BREAK_EVENT |
| 1535 | ADD_INT_MACRO(CTRL_BREAK_EVENT); |
| 1536 | #endif |
| 1537 | |
| 1538 | return 0; |
| 1539 | |
| 1540 | #undef ADD_INT_MACRO |
| 1541 | } |
| 1542 | |
| 1543 | |
| 1544 | static int |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1545 | signal_module_exec(PyObject *m) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1546 | { |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1547 | assert(!PyErr_Occurred()); |
| 1548 | |
| 1549 | if (signal_add_constants(m) < 0) { |
| 1550 | return -1; |
| 1551 | } |
| 1552 | |
| 1553 | /* Add some symbolic constants to the module */ |
| 1554 | PyObject *d = PyModule_GetDict(m); |
| 1555 | if (PyDict_SetItemString(d, "SIG_DFL", DefaultHandler) < 0) { |
| 1556 | return -1; |
| 1557 | } |
| 1558 | if (PyDict_SetItemString(d, "SIG_IGN", IgnoreHandler) < 0) { |
| 1559 | return -1; |
| 1560 | } |
| 1561 | #if defined(HAVE_GETITIMER) || defined(HAVE_SETITIMER) |
| 1562 | if (PyDict_SetItemString(d, "ItimerError", ItimerError) < 0) { |
| 1563 | return -1; |
| 1564 | } |
| 1565 | #endif |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1566 | #if defined(HAVE_SIGWAITINFO) || defined(HAVE_SIGTIMEDWAIT) |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1567 | if (PyModule_AddType(m, &SiginfoType) < 0) { |
| 1568 | return -1; |
| 1569 | } |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 1570 | #endif |
| 1571 | |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1572 | // Get signal handlers |
| 1573 | for (int signum = 1; signum < NSIG; signum++) { |
| 1574 | void (*c_handler)(int) = PyOS_getsig(signum); |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1575 | PyObject *func; |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1576 | if (c_handler == SIG_DFL) { |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1577 | func = DefaultHandler; |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1578 | } |
| 1579 | else if (c_handler == SIG_IGN) { |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1580 | func = IgnoreHandler; |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1581 | } |
| 1582 | else { |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1583 | func = Py_None; // None of our business |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1584 | } |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1585 | // If signal_module_exec() is called more than one, we must |
| 1586 | // clear the strong reference to the previous function. |
| 1587 | Py_XSETREF(Handlers[signum].func, Py_NewRef(func)); |
animalize | 77643c4 | 2019-09-09 21:46:26 +0800 | [diff] [blame] | 1588 | } |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1589 | |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1590 | // Instal Python SIGINT handler which raises KeyboardInterrupt |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1591 | if (Handlers[SIGINT].func == DefaultHandler) { |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 1592 | PyObject *int_handler = PyMapping_GetItemString(d, "default_int_handler"); |
| 1593 | if (!int_handler) { |
| 1594 | return -1; |
| 1595 | } |
| 1596 | |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 1597 | Py_SETREF(Handlers[SIGINT].func, int_handler); |
pkerling | e905c84 | 2018-06-01 09:47:18 +0000 | [diff] [blame] | 1598 | PyOS_setsig(SIGINT, signal_handler); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1599 | } |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1600 | |
Victor Stinner | cda23be | 2020-11-17 18:57:32 +0100 | [diff] [blame] | 1601 | assert(!PyErr_Occurred()); |
| 1602 | return 0; |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1603 | } |
| 1604 | |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1605 | |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1606 | static PyModuleDef_Slot signal_slots[] = { |
| 1607 | {Py_mod_exec, signal_module_exec}, |
| 1608 | {0, NULL} |
| 1609 | }; |
| 1610 | |
| 1611 | static struct PyModuleDef signal_module = { |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1612 | PyModuleDef_HEAD_INIT, |
| 1613 | "_signal", |
| 1614 | .m_doc = module_doc, |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1615 | .m_size = 0, |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1616 | .m_methods = signal_methods, |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1617 | .m_slots = signal_slots, |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1618 | }; |
| 1619 | |
Victor Stinner | 4b8032e | 2020-09-04 14:51:05 +0200 | [diff] [blame] | 1620 | |
Mohamed Koubaa | 71d1bd9 | 2020-09-03 03:21:06 -0500 | [diff] [blame] | 1621 | PyMODINIT_FUNC |
| 1622 | PyInit__signal(void) |
| 1623 | { |
Victor Stinner | 7f9b25a | 2020-11-17 23:28:25 +0100 | [diff] [blame] | 1624 | return PyModuleDef_Init(&signal_module); |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 1625 | } |
| 1626 | |
Victor Stinner | 4b8032e | 2020-09-04 14:51:05 +0200 | [diff] [blame] | 1627 | |
Victor Stinner | 296a796 | 2020-11-17 16:22:23 +0100 | [diff] [blame] | 1628 | void |
| 1629 | _PySignal_Fini(void) |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 1630 | { |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 1631 | // Restore default signals and clear handlers |
| 1632 | for (int signum = 1; signum < NSIG; signum++) { |
| 1633 | PyObject *func = Handlers[signum].func; |
| 1634 | _Py_atomic_store_relaxed(&Handlers[signum].tripped, 0); |
| 1635 | Handlers[signum].func = NULL; |
| 1636 | if (func != NULL |
| 1637 | && func != Py_None |
| 1638 | && func != DefaultHandler |
| 1639 | && func != IgnoreHandler) |
| 1640 | { |
| 1641 | PyOS_setsig(signum, SIG_DFL); |
| 1642 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1643 | Py_XDECREF(func); |
| 1644 | } |
Guido van Rossum | 08c1661 | 1997-08-02 03:01:42 +0000 | [diff] [blame] | 1645 | |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 1646 | #ifdef MS_WINDOWS |
| 1647 | if (sigint_event != NULL) { |
| 1648 | CloseHandle(sigint_event); |
| 1649 | sigint_event = NULL; |
| 1650 | } |
| 1651 | #endif |
| 1652 | |
Serhiy Storchaka | 505ff75 | 2014-02-09 13:33:53 +0200 | [diff] [blame] | 1653 | Py_CLEAR(DefaultHandler); |
| 1654 | Py_CLEAR(IgnoreHandler); |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 1655 | #if defined(HAVE_GETITIMER) || defined(HAVE_SETITIMER) |
animalize | 77643c4 | 2019-09-09 21:46:26 +0800 | [diff] [blame] | 1656 | Py_CLEAR(ItimerError); |
| 1657 | #endif |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1658 | } |
| 1659 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 1660 | |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 1661 | /* Declared in pyerrors.h */ |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1662 | int |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 1663 | PyErr_CheckSignals(void) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1664 | { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1665 | PyThreadState *tstate = _PyThreadState_GET(); |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 1666 | if (!_Py_ThreadCanHandleSignals(tstate->interp)) { |
Eric Snow | 64d6cc8 | 2019-02-23 15:40:43 -0700 | [diff] [blame] | 1667 | return 0; |
| 1668 | } |
| 1669 | |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1670 | return _PyErr_CheckSignalsTstate(tstate); |
Eric Snow | 64d6cc8 | 2019-02-23 15:40:43 -0700 | [diff] [blame] | 1671 | } |
| 1672 | |
| 1673 | |
| 1674 | /* Declared in cpython/pyerrors.h */ |
| 1675 | int |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1676 | _PyErr_CheckSignalsTstate(PyThreadState *tstate) |
Eric Snow | 64d6cc8 | 2019-02-23 15:40:43 -0700 | [diff] [blame] | 1677 | { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1678 | if (!_Py_atomic_load(&is_tripped)) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1679 | return 0; |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1680 | } |
Christian Heimes | b76922a | 2007-12-11 01:06:40 +0000 | [diff] [blame] | 1681 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1682 | /* |
| 1683 | * The is_tripped variable is meant to speed up the calls to |
| 1684 | * PyErr_CheckSignals (both directly or via pending calls) when no |
| 1685 | * signal has arrived. This variable is set to 1 when a signal arrives |
| 1686 | * and it is set to 0 here, when we know some signals arrived. This way |
| 1687 | * we can run the registered handlers with no signals blocked. |
| 1688 | * |
| 1689 | * NOTE: with this approach we can have a situation where is_tripped is |
| 1690 | * 1 but we have no more signals to handle (Handlers[i].tripped |
| 1691 | * is 0 for every signal i). This won't do us any harm (except |
| 1692 | * we're gonna spent some cycles for nothing). This happens when |
| 1693 | * we receive a signal i after we zero is_tripped and before we |
| 1694 | * check Handlers[i].tripped. |
| 1695 | */ |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 1696 | _Py_atomic_store(&is_tripped, 0); |
Christian Heimes | b76922a | 2007-12-11 01:06:40 +0000 | [diff] [blame] | 1697 | |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1698 | PyObject *frame = (PyObject *)tstate->frame; |
| 1699 | if (!frame) { |
| 1700 | frame = Py_None; |
| 1701 | } |
Christian Heimes | b76922a | 2007-12-11 01:06:40 +0000 | [diff] [blame] | 1702 | |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1703 | for (int i = 1; i < NSIG; i++) { |
| 1704 | if (!_Py_atomic_load_relaxed(&Handlers[i].tripped)) { |
| 1705 | continue; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1706 | } |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1707 | _Py_atomic_store_relaxed(&Handlers[i].tripped, 0); |
| 1708 | |
| 1709 | PyObject *arglist = Py_BuildValue("(iO)", i, frame); |
| 1710 | PyObject *result; |
| 1711 | if (arglist) { |
| 1712 | result = _PyObject_Call(tstate, Handlers[i].func, arglist, NULL); |
| 1713 | Py_DECREF(arglist); |
| 1714 | } |
| 1715 | else { |
| 1716 | result = NULL; |
| 1717 | } |
| 1718 | if (!result) { |
| 1719 | /* On error, re-schedule a call to _PyErr_CheckSignalsTstate() */ |
| 1720 | _Py_atomic_store(&is_tripped, 1); |
| 1721 | return -1; |
| 1722 | } |
| 1723 | |
| 1724 | Py_DECREF(result); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1725 | } |
Christian Heimes | b76922a | 2007-12-11 01:06:40 +0000 | [diff] [blame] | 1726 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1727 | return 0; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1728 | } |
| 1729 | |
Guido van Rossum | d2cd7ad | 2000-09-16 16:35:28 +0000 | [diff] [blame] | 1730 | |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1731 | |
| 1732 | int |
| 1733 | _PyErr_CheckSignals(void) |
| 1734 | { |
| 1735 | PyThreadState *tstate = _PyThreadState_GET(); |
| 1736 | return _PyErr_CheckSignalsTstate(tstate); |
| 1737 | } |
| 1738 | |
| 1739 | |
Matěj Cepl | 608876b | 2019-05-23 22:30:00 +0200 | [diff] [blame] | 1740 | /* Simulate the effect of a signal.SIGINT signal arriving. The next time |
| 1741 | PyErr_CheckSignals is called, the Python SIGINT signal handler will be |
| 1742 | raised. |
| 1743 | |
| 1744 | Missing signal handler for the SIGINT signal is silently ignored. */ |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 1745 | void |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 1746 | PyErr_SetInterrupt(void) |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 1747 | { |
Matěj Cepl | 608876b | 2019-05-23 22:30:00 +0200 | [diff] [blame] | 1748 | if ((Handlers[SIGINT].func != IgnoreHandler) && |
| 1749 | (Handlers[SIGINT].func != DefaultHandler)) { |
| 1750 | trip_signal(SIGINT); |
| 1751 | } |
Barry Warsaw | 9297117 | 1997-01-03 00:14:25 +0000 | [diff] [blame] | 1752 | } |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1753 | |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 1754 | static int |
| 1755 | signal_install_handlers(void) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1756 | { |
Victor Stinner | 296a796 | 2020-11-17 16:22:23 +0100 | [diff] [blame] | 1757 | #ifdef SIGPIPE |
| 1758 | PyOS_setsig(SIGPIPE, SIG_IGN); |
| 1759 | #endif |
| 1760 | #ifdef SIGXFZ |
| 1761 | PyOS_setsig(SIGXFZ, SIG_IGN); |
| 1762 | #endif |
| 1763 | #ifdef SIGXFSZ |
| 1764 | PyOS_setsig(SIGXFSZ, SIG_IGN); |
| 1765 | #endif |
| 1766 | |
| 1767 | // Import _signal to install the Python SIGINT handler |
| 1768 | PyObject *module = PyImport_ImportModule("_signal"); |
| 1769 | if (!module) { |
| 1770 | return -1; |
| 1771 | } |
| 1772 | Py_DECREF(module); |
| 1773 | |
| 1774 | return 0; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1775 | } |
| 1776 | |
Victor Stinner | fa7ab6a | 2020-06-03 14:39:59 +0200 | [diff] [blame] | 1777 | |
Victor Stinner | 29aa624 | 2020-11-17 22:55:30 +0100 | [diff] [blame] | 1778 | /* Restore signals that the interpreter has called SIG_IGN on to SIG_DFL. |
| 1779 | * |
| 1780 | * All of the code in this function must only use async-signal-safe functions, |
| 1781 | * listed at `man 7 signal` or |
| 1782 | * http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_04.html. |
| 1783 | * |
| 1784 | * If this function is updated, update also _posix_spawn() of subprocess.py. |
| 1785 | */ |
| 1786 | void |
| 1787 | _Py_RestoreSignals(void) |
| 1788 | { |
| 1789 | #ifdef SIGPIPE |
| 1790 | PyOS_setsig(SIGPIPE, SIG_DFL); |
| 1791 | #endif |
| 1792 | #ifdef SIGXFZ |
| 1793 | PyOS_setsig(SIGXFZ, SIG_DFL); |
| 1794 | #endif |
| 1795 | #ifdef SIGXFSZ |
| 1796 | PyOS_setsig(SIGXFSZ, SIG_DFL); |
| 1797 | #endif |
| 1798 | } |
| 1799 | |
| 1800 | |
Victor Stinner | 0ae323b | 2020-11-17 18:15:20 +0100 | [diff] [blame] | 1801 | int |
| 1802 | _PySignal_Init(int install_signal_handlers) |
| 1803 | { |
| 1804 | DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL); |
| 1805 | if (!DefaultHandler) { |
| 1806 | return -1; |
| 1807 | } |
| 1808 | |
| 1809 | IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN); |
| 1810 | if (!IgnoreHandler) { |
| 1811 | return -1; |
| 1812 | } |
| 1813 | |
| 1814 | #if defined(HAVE_GETITIMER) || defined(HAVE_SETITIMER) |
| 1815 | ItimerError = PyErr_NewException("signal.ItimerError", |
| 1816 | PyExc_OSError, NULL); |
| 1817 | if (!ItimerError) { |
| 1818 | return -1; |
| 1819 | } |
| 1820 | #endif |
| 1821 | |
| 1822 | #ifdef MS_WINDOWS |
| 1823 | /* Create manual-reset event, initially unset */ |
| 1824 | sigint_event = CreateEvent(NULL, TRUE, FALSE, FALSE); |
| 1825 | if (sigint_event == NULL) { |
| 1826 | PyErr_SetFromWindowsErr(0); |
| 1827 | return -1; |
| 1828 | } |
| 1829 | #endif |
| 1830 | |
| 1831 | #if defined(HAVE_SIGWAITINFO) || defined(HAVE_SIGTIMEDWAIT) |
| 1832 | if (SiginfoType.tp_name == NULL) { |
| 1833 | if (PyStructSequence_InitType2(&SiginfoType, &struct_siginfo_desc) < 0) { |
| 1834 | return -1; |
| 1835 | } |
| 1836 | } |
| 1837 | #endif |
| 1838 | |
| 1839 | for (int signum = 1; signum < NSIG; signum++) { |
| 1840 | _Py_atomic_store_relaxed(&Handlers[signum].tripped, 0); |
| 1841 | } |
| 1842 | |
| 1843 | if (install_signal_handlers) { |
| 1844 | if (signal_install_handlers() < 0) { |
| 1845 | return -1; |
| 1846 | } |
| 1847 | } |
| 1848 | |
| 1849 | return 0; |
| 1850 | } |
| 1851 | |
| 1852 | |
Victor Stinner | fa7ab6a | 2020-06-03 14:39:59 +0200 | [diff] [blame] | 1853 | // The caller doesn't have to hold the GIL |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1854 | int |
Victor Stinner | fa7ab6a | 2020-06-03 14:39:59 +0200 | [diff] [blame] | 1855 | _PyOS_InterruptOccurred(PyThreadState *tstate) |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1856 | { |
Victor Stinner | cbe1296 | 2020-06-01 20:34:15 +0200 | [diff] [blame] | 1857 | _Py_EnsureTstateNotNULL(tstate); |
| 1858 | if (!_Py_ThreadCanHandleSignals(tstate->interp)) { |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1859 | return 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1860 | } |
Victor Stinner | 7281898 | 2020-03-26 22:28:11 +0100 | [diff] [blame] | 1861 | |
| 1862 | if (!_Py_atomic_load_relaxed(&Handlers[SIGINT].tripped)) { |
| 1863 | return 0; |
| 1864 | } |
| 1865 | |
| 1866 | _Py_atomic_store_relaxed(&Handlers[SIGINT].tripped, 0); |
| 1867 | return 1; |
Guido van Rossum | 398d9fe | 1994-05-11 08:59:13 +0000 | [diff] [blame] | 1868 | } |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 1869 | |
Victor Stinner | 26881c8 | 2020-06-02 15:51:37 +0200 | [diff] [blame] | 1870 | |
Victor Stinner | fa7ab6a | 2020-06-03 14:39:59 +0200 | [diff] [blame] | 1871 | // The caller must to hold the GIL |
| 1872 | int |
| 1873 | PyOS_InterruptOccurred(void) |
| 1874 | { |
| 1875 | PyThreadState *tstate = _PyThreadState_GET(); |
| 1876 | return _PyOS_InterruptOccurred(tstate); |
| 1877 | } |
| 1878 | |
| 1879 | |
Victor Stinner | 26881c8 | 2020-06-02 15:51:37 +0200 | [diff] [blame] | 1880 | #ifdef HAVE_FORK |
Gregory P. Smith | 9463e3a | 2012-11-10 20:33:07 -0800 | [diff] [blame] | 1881 | static void |
| 1882 | _clear_pending_signals(void) |
| 1883 | { |
Victor Stinner | 26881c8 | 2020-06-02 15:51:37 +0200 | [diff] [blame] | 1884 | if (!_Py_atomic_load(&is_tripped)) { |
Gregory P. Smith | 9463e3a | 2012-11-10 20:33:07 -0800 | [diff] [blame] | 1885 | return; |
Victor Stinner | 26881c8 | 2020-06-02 15:51:37 +0200 | [diff] [blame] | 1886 | } |
| 1887 | |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 1888 | _Py_atomic_store(&is_tripped, 0); |
Victor Stinner | 26881c8 | 2020-06-02 15:51:37 +0200 | [diff] [blame] | 1889 | for (int i = 1; i < NSIG; ++i) { |
Antoine Pitrou | 2c8a5e4 | 2017-07-17 12:25:19 +0200 | [diff] [blame] | 1890 | _Py_atomic_store_relaxed(&Handlers[i].tripped, 0); |
Gregory P. Smith | 9463e3a | 2012-11-10 20:33:07 -0800 | [diff] [blame] | 1891 | } |
| 1892 | } |
| 1893 | |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 1894 | void |
Antoine Pitrou | 346cbd3 | 2017-05-27 17:50:54 +0200 | [diff] [blame] | 1895 | _PySignal_AfterFork(void) |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 1896 | { |
Gregory P. Smith | 9463e3a | 2012-11-10 20:33:07 -0800 | [diff] [blame] | 1897 | /* Clear the signal flags after forking so that they aren't handled |
| 1898 | * in both processes if they came in just before the fork() but before |
| 1899 | * the interpreter had an opportunity to call the handlers. issue9535. */ |
| 1900 | _clear_pending_signals(); |
Guido van Rossum | 359bcaa | 1997-11-14 22:24:28 +0000 | [diff] [blame] | 1901 | } |
Victor Stinner | 26881c8 | 2020-06-02 15:51:37 +0200 | [diff] [blame] | 1902 | #endif /* HAVE_FORK */ |
| 1903 | |
Antoine Pitrou | 6dd381e | 2011-11-21 21:26:56 +0100 | [diff] [blame] | 1904 | |
| 1905 | int |
| 1906 | _PyOS_IsMainThread(void) |
| 1907 | { |
Victor Stinner | 81a7be3 | 2020-04-14 15:14:01 +0200 | [diff] [blame] | 1908 | PyInterpreterState *interp = _PyInterpreterState_GET(); |
Victor Stinner | b54a99d | 2020-04-08 23:35:05 +0200 | [diff] [blame] | 1909 | return _Py_ThreadCanHandleSignals(interp); |
Antoine Pitrou | 6dd381e | 2011-11-21 21:26:56 +0100 | [diff] [blame] | 1910 | } |
| 1911 | |
| 1912 | #ifdef MS_WINDOWS |
| 1913 | void *_PyOS_SigintEvent(void) |
| 1914 | { |
| 1915 | /* Returns a manual-reset event which gets tripped whenever |
| 1916 | SIGINT is received. |
| 1917 | |
| 1918 | Python.h does not include windows.h so we do cannot use HANDLE |
| 1919 | as the return type of this function. We use void* instead. */ |
| 1920 | return sigint_event; |
| 1921 | } |
| 1922 | #endif |