Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1 | #include "Python.h" |
| 2 | #include "pythread.h" |
| 3 | #include <signal.h> |
| 4 | #include <object.h> |
| 5 | #include <frameobject.h> |
| 6 | #include <signal.h> |
Victor Stinner | 0aafa4f | 2011-06-29 23:28:02 +0200 | [diff] [blame] | 7 | #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK) |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 8 | # include <pthread.h> |
| 9 | #endif |
| 10 | #ifdef MS_WINDOWS |
| 11 | # include <windows.h> |
| 12 | #endif |
| 13 | #ifdef HAVE_SYS_RESOURCE_H |
| 14 | # include <sys/resource.h> |
Victor Stinner | 0aafa4f | 2011-06-29 23:28:02 +0200 | [diff] [blame] | 15 | #endif |
| 16 | |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 17 | /* Allocate at maximum 100 MB of the stack to raise the stack overflow */ |
| 18 | #define STACK_OVERFLOW_MAX_SIZE (100*1024*1024) |
| 19 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 20 | #ifdef WITH_THREAD |
| 21 | # define FAULTHANDLER_LATER |
| 22 | #endif |
| 23 | |
| 24 | #ifndef MS_WINDOWS |
Victor Stinner | d727e23 | 2011-04-01 12:13:55 +0200 | [diff] [blame] | 25 | /* register() is useless on Windows, because only SIGSEGV, SIGABRT and |
| 26 | SIGILL can be handled by the process, and these signals can only be used |
| 27 | with enable(), not using register() */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 28 | # define FAULTHANDLER_USER |
| 29 | #endif |
| 30 | |
Victor Stinner | c7489a5 | 2015-04-01 18:48:58 +0200 | [diff] [blame] | 31 | #define PUTS(fd, str) _Py_write_noraise(fd, str, strlen(str)) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 32 | |
Victor Stinner | bd303c1 | 2013-11-07 23:07:29 +0100 | [diff] [blame] | 33 | _Py_IDENTIFIER(enable); |
| 34 | _Py_IDENTIFIER(fileno); |
| 35 | _Py_IDENTIFIER(flush); |
| 36 | _Py_IDENTIFIER(stderr); |
| 37 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 38 | #ifdef HAVE_SIGACTION |
| 39 | typedef struct sigaction _Py_sighandler_t; |
| 40 | #else |
| 41 | typedef PyOS_sighandler_t _Py_sighandler_t; |
| 42 | #endif |
| 43 | |
| 44 | typedef struct { |
| 45 | int signum; |
| 46 | int enabled; |
| 47 | const char* name; |
| 48 | _Py_sighandler_t previous; |
| 49 | int all_threads; |
| 50 | } fault_handler_t; |
| 51 | |
| 52 | static struct { |
| 53 | int enabled; |
| 54 | PyObject *file; |
| 55 | int fd; |
| 56 | int all_threads; |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 57 | PyInterpreterState *interp; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 58 | } fatal_error = {0, NULL, -1, 0}; |
| 59 | |
| 60 | #ifdef FAULTHANDLER_LATER |
| 61 | static struct { |
| 62 | PyObject *file; |
| 63 | int fd; |
Victor Stinner | 9418932 | 2011-04-08 13:00:31 +0200 | [diff] [blame] | 64 | PY_TIMEOUT_T timeout_us; /* timeout in microseconds */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 65 | int repeat; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 66 | PyInterpreterState *interp; |
| 67 | int exit; |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 68 | char *header; |
| 69 | size_t header_len; |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 70 | /* The main thread always holds this lock. It is only released when |
| 71 | faulthandler_thread() is interrupted before this thread exits, or at |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 72 | Python exit. */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 73 | PyThread_type_lock cancel_event; |
| 74 | /* released by child thread when joined */ |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 75 | PyThread_type_lock running; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 76 | } thread; |
| 77 | #endif |
| 78 | |
| 79 | #ifdef FAULTHANDLER_USER |
| 80 | typedef struct { |
| 81 | int enabled; |
| 82 | PyObject *file; |
| 83 | int fd; |
| 84 | int all_threads; |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 85 | int chain; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 86 | _Py_sighandler_t previous; |
Victor Stinner | 44378d4 | 2011-04-01 15:37:12 +0200 | [diff] [blame] | 87 | PyInterpreterState *interp; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 88 | } user_signal_t; |
| 89 | |
| 90 | static user_signal_t *user_signals; |
| 91 | |
| 92 | /* the following macros come from Python: Modules/signalmodule.c */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 93 | #ifndef NSIG |
| 94 | # if defined(_NSIG) |
| 95 | # define NSIG _NSIG /* For BSD/SysV */ |
| 96 | # elif defined(_SIGMAX) |
| 97 | # define NSIG (_SIGMAX + 1) /* For QNX */ |
| 98 | # elif defined(SIGMAX) |
| 99 | # define NSIG (SIGMAX + 1) /* For djgpp */ |
| 100 | # else |
| 101 | # define NSIG 64 /* Use a reasonable default value */ |
| 102 | # endif |
| 103 | #endif |
| 104 | |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 105 | static void faulthandler_user(int signum); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 106 | #endif /* FAULTHANDLER_USER */ |
| 107 | |
| 108 | |
| 109 | static fault_handler_t faulthandler_handlers[] = { |
| 110 | #ifdef SIGBUS |
| 111 | {SIGBUS, 0, "Bus error", }, |
| 112 | #endif |
| 113 | #ifdef SIGILL |
| 114 | {SIGILL, 0, "Illegal instruction", }, |
| 115 | #endif |
| 116 | {SIGFPE, 0, "Floating point exception", }, |
Victor Stinner | d727e23 | 2011-04-01 12:13:55 +0200 | [diff] [blame] | 117 | {SIGABRT, 0, "Aborted", }, |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 118 | /* define SIGSEGV at the end to make it the default choice if searching the |
| 119 | handler fails in faulthandler_fatal_error() */ |
| 120 | {SIGSEGV, 0, "Segmentation fault", } |
| 121 | }; |
| 122 | static const unsigned char faulthandler_nsignals = \ |
Victor Stinner | 6394188 | 2011-09-29 00:42:28 +0200 | [diff] [blame] | 123 | Py_ARRAY_LENGTH(faulthandler_handlers); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 124 | |
| 125 | #ifdef HAVE_SIGALTSTACK |
| 126 | static stack_t stack; |
| 127 | #endif |
| 128 | |
| 129 | |
| 130 | /* Get the file descriptor of a file by calling its fileno() method and then |
| 131 | call its flush() method. |
| 132 | |
| 133 | If file is NULL or Py_None, use sys.stderr as the new file. |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 134 | If file is an integer, it will be treated as file descriptor. |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 135 | |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 136 | On success, return the file descriptor and write the new file into *file_ptr. |
| 137 | On error, return -1. */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 138 | |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 139 | static int |
| 140 | faulthandler_get_fileno(PyObject **file_ptr) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 141 | { |
| 142 | PyObject *result; |
| 143 | long fd_long; |
| 144 | int fd; |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 145 | PyObject *file = *file_ptr; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 146 | |
| 147 | if (file == NULL || file == Py_None) { |
Victor Stinner | bd303c1 | 2013-11-07 23:07:29 +0100 | [diff] [blame] | 148 | file = _PySys_GetObjectId(&PyId_stderr); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 149 | if (file == NULL) { |
| 150 | PyErr_SetString(PyExc_RuntimeError, "unable to get sys.stderr"); |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 151 | return -1; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 152 | } |
Victor Stinner | e2d6690 | 2014-05-14 17:15:50 +0200 | [diff] [blame] | 153 | if (file == Py_None) { |
| 154 | PyErr_SetString(PyExc_RuntimeError, "sys.stderr is None"); |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 155 | return -1; |
Victor Stinner | e2d6690 | 2014-05-14 17:15:50 +0200 | [diff] [blame] | 156 | } |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 157 | } |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 158 | else if (PyLong_Check(file)) { |
| 159 | fd = _PyLong_AsInt(file); |
| 160 | if (fd == -1 && PyErr_Occurred()) |
| 161 | return -1; |
| 162 | if (fd < 0 || !_PyVerify_fd(fd)) { |
| 163 | PyErr_SetString(PyExc_ValueError, |
| 164 | "file is not a valid file descripter"); |
| 165 | return -1; |
| 166 | } |
| 167 | *file_ptr = NULL; |
| 168 | return fd; |
| 169 | } |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 170 | |
Martin v. Löwis | afe55bb | 2011-10-09 10:38:36 +0200 | [diff] [blame] | 171 | result = _PyObject_CallMethodId(file, &PyId_fileno, ""); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 172 | if (result == NULL) |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 173 | return -1; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 174 | |
| 175 | fd = -1; |
| 176 | if (PyLong_Check(result)) { |
| 177 | fd_long = PyLong_AsLong(result); |
| 178 | if (0 <= fd_long && fd_long < INT_MAX) |
| 179 | fd = (int)fd_long; |
| 180 | } |
| 181 | Py_DECREF(result); |
| 182 | |
| 183 | if (fd == -1) { |
| 184 | PyErr_SetString(PyExc_RuntimeError, |
| 185 | "file.fileno() is not a valid file descriptor"); |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 186 | return -1; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 187 | } |
| 188 | |
Martin v. Löwis | afe55bb | 2011-10-09 10:38:36 +0200 | [diff] [blame] | 189 | result = _PyObject_CallMethodId(file, &PyId_flush, ""); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 190 | if (result != NULL) |
| 191 | Py_DECREF(result); |
| 192 | else { |
| 193 | /* ignore flush() error */ |
| 194 | PyErr_Clear(); |
| 195 | } |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 196 | *file_ptr = file; |
| 197 | return fd; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 198 | } |
| 199 | |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 200 | /* Get the state of the current thread: only call this function if the current |
| 201 | thread holds the GIL. Raise an exception on error. */ |
| 202 | static PyThreadState* |
| 203 | get_thread_state(void) |
| 204 | { |
| 205 | PyThreadState *tstate = PyThreadState_Get(); |
| 206 | if (tstate == NULL) { |
| 207 | PyErr_SetString(PyExc_RuntimeError, |
| 208 | "unable to get the current thread state"); |
| 209 | return NULL; |
| 210 | } |
| 211 | return tstate; |
| 212 | } |
| 213 | |
Victor Stinner | c7489a5 | 2015-04-01 18:48:58 +0200 | [diff] [blame] | 214 | static void |
| 215 | faulthandler_dump_traceback(int fd, int all_threads, |
| 216 | PyInterpreterState *interp) |
| 217 | { |
| 218 | static volatile int reentrant = 0; |
| 219 | PyThreadState *tstate; |
| 220 | |
| 221 | if (reentrant) |
| 222 | return; |
| 223 | |
| 224 | reentrant = 1; |
| 225 | |
| 226 | #ifdef WITH_THREAD |
| 227 | /* SIGSEGV, SIGFPE, SIGABRT, SIGBUS and SIGILL are synchronous signals and |
| 228 | are thus delivered to the thread that caused the fault. Get the Python |
| 229 | thread state of the current thread. |
| 230 | |
| 231 | PyThreadState_Get() doesn't give the state of the thread that caused the |
| 232 | fault if the thread released the GIL, and so this function cannot be |
| 233 | used. Read the thread local storage (TLS) instead: call |
| 234 | PyGILState_GetThisThreadState(). */ |
| 235 | tstate = PyGILState_GetThisThreadState(); |
| 236 | #else |
| 237 | tstate = PyThreadState_Get(); |
| 238 | #endif |
| 239 | |
| 240 | if (all_threads) |
| 241 | _Py_DumpTracebackThreads(fd, interp, tstate); |
| 242 | else { |
| 243 | if (tstate != NULL) |
| 244 | _Py_DumpTraceback(fd, tstate); |
| 245 | } |
| 246 | |
| 247 | reentrant = 0; |
| 248 | } |
| 249 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 250 | static PyObject* |
| 251 | faulthandler_dump_traceback_py(PyObject *self, |
| 252 | PyObject *args, PyObject *kwargs) |
| 253 | { |
| 254 | static char *kwlist[] = {"file", "all_threads", NULL}; |
| 255 | PyObject *file = NULL; |
Victor Stinner | 7bba62f | 2011-05-07 12:43:00 +0200 | [diff] [blame] | 256 | int all_threads = 1; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 257 | PyThreadState *tstate; |
| 258 | const char *errmsg; |
| 259 | int fd; |
| 260 | |
| 261 | if (!PyArg_ParseTupleAndKeywords(args, kwargs, |
| 262 | "|Oi:dump_traceback", kwlist, |
| 263 | &file, &all_threads)) |
| 264 | return NULL; |
| 265 | |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 266 | fd = faulthandler_get_fileno(&file); |
| 267 | if (fd < 0) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 268 | return NULL; |
| 269 | |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 270 | tstate = get_thread_state(); |
| 271 | if (tstate == NULL) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 272 | return NULL; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 273 | |
| 274 | if (all_threads) { |
| 275 | errmsg = _Py_DumpTracebackThreads(fd, tstate->interp, tstate); |
| 276 | if (errmsg != NULL) { |
| 277 | PyErr_SetString(PyExc_RuntimeError, errmsg); |
| 278 | return NULL; |
| 279 | } |
| 280 | } |
| 281 | else { |
| 282 | _Py_DumpTraceback(fd, tstate); |
| 283 | } |
Victor Stinner | c7489a5 | 2015-04-01 18:48:58 +0200 | [diff] [blame] | 284 | |
| 285 | if (PyErr_CheckSignals()) |
| 286 | return NULL; |
| 287 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 288 | Py_RETURN_NONE; |
| 289 | } |
| 290 | |
| 291 | |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 292 | /* Handler for SIGSEGV, SIGFPE, SIGABRT, SIGBUS and SIGILL signals. |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 293 | |
| 294 | Display the current Python traceback, restore the previous handler and call |
| 295 | the previous handler. |
| 296 | |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 297 | On Windows, don't explicitly call the previous handler, because the Windows |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 298 | signal handler would not be called (for an unknown reason). The execution of |
| 299 | the program continues at faulthandler_fatal_error() exit, but the same |
| 300 | instruction will raise the same fault (signal), and so the previous handler |
| 301 | will be called. |
| 302 | |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 303 | This function is signal-safe and should only call signal-safe functions. */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 304 | |
| 305 | static void |
Victor Stinner | 44e31ba | 2011-04-07 11:39:03 +0200 | [diff] [blame] | 306 | faulthandler_fatal_error(int signum) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 307 | { |
| 308 | const int fd = fatal_error.fd; |
| 309 | unsigned int i; |
| 310 | fault_handler_t *handler = NULL; |
Victor Stinner | c925617 | 2011-05-07 12:20:11 +0200 | [diff] [blame] | 311 | int save_errno = errno; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 312 | |
| 313 | if (!fatal_error.enabled) |
| 314 | return; |
| 315 | |
| 316 | for (i=0; i < faulthandler_nsignals; i++) { |
| 317 | handler = &faulthandler_handlers[i]; |
| 318 | if (handler->signum == signum) |
| 319 | break; |
| 320 | } |
| 321 | if (handler == NULL) { |
| 322 | /* faulthandler_nsignals == 0 (unlikely) */ |
| 323 | return; |
| 324 | } |
| 325 | |
| 326 | /* restore the previous handler */ |
| 327 | #ifdef HAVE_SIGACTION |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 328 | (void)sigaction(signum, &handler->previous, NULL); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 329 | #else |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 330 | (void)signal(signum, handler->previous); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 331 | #endif |
| 332 | handler->enabled = 0; |
| 333 | |
| 334 | PUTS(fd, "Fatal Python error: "); |
| 335 | PUTS(fd, handler->name); |
| 336 | PUTS(fd, "\n\n"); |
| 337 | |
Victor Stinner | c7489a5 | 2015-04-01 18:48:58 +0200 | [diff] [blame] | 338 | faulthandler_dump_traceback(fd, fatal_error.all_threads, |
| 339 | fatal_error.interp); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 340 | |
Victor Stinner | c925617 | 2011-05-07 12:20:11 +0200 | [diff] [blame] | 341 | errno = save_errno; |
Victor Stinner | bc6a4db | 2011-04-01 12:08:57 +0200 | [diff] [blame] | 342 | #ifdef MS_WINDOWS |
| 343 | if (signum == SIGSEGV) { |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 344 | /* don't explicitly call the previous handler for SIGSEGV in this signal |
Victor Stinner | bc6a4db | 2011-04-01 12:08:57 +0200 | [diff] [blame] | 345 | handler, because the Windows signal handler would not be called */ |
| 346 | return; |
| 347 | } |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 348 | #endif |
R David Murray | fc06999 | 2013-12-13 20:52:19 -0500 | [diff] [blame] | 349 | /* call the previous signal handler: it is called immediately if we use |
Victor Stinner | bc6a4db | 2011-04-01 12:08:57 +0200 | [diff] [blame] | 350 | sigaction() thanks to SA_NODEFER flag, otherwise it is deferred */ |
| 351 | raise(signum); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 352 | } |
| 353 | |
Victor Stinner | d727e23 | 2011-04-01 12:13:55 +0200 | [diff] [blame] | 354 | /* Install the handler for fatal signals, faulthandler_fatal_error(). */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 355 | |
| 356 | static PyObject* |
| 357 | faulthandler_enable(PyObject *self, PyObject *args, PyObject *kwargs) |
| 358 | { |
| 359 | static char *kwlist[] = {"file", "all_threads", NULL}; |
| 360 | PyObject *file = NULL; |
Victor Stinner | 7bba62f | 2011-05-07 12:43:00 +0200 | [diff] [blame] | 361 | int all_threads = 1; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 362 | unsigned int i; |
| 363 | fault_handler_t *handler; |
| 364 | #ifdef HAVE_SIGACTION |
| 365 | struct sigaction action; |
| 366 | #endif |
| 367 | int err; |
| 368 | int fd; |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 369 | PyThreadState *tstate; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 370 | |
| 371 | if (!PyArg_ParseTupleAndKeywords(args, kwargs, |
| 372 | "|Oi:enable", kwlist, &file, &all_threads)) |
| 373 | return NULL; |
| 374 | |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 375 | fd = faulthandler_get_fileno(&file); |
| 376 | if (fd < 0) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 377 | return NULL; |
| 378 | |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 379 | tstate = get_thread_state(); |
| 380 | if (tstate == NULL) |
| 381 | return NULL; |
| 382 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 383 | Py_XDECREF(fatal_error.file); |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 384 | Py_XINCREF(file); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 385 | fatal_error.file = file; |
| 386 | fatal_error.fd = fd; |
| 387 | fatal_error.all_threads = all_threads; |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 388 | fatal_error.interp = tstate->interp; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 389 | |
| 390 | if (!fatal_error.enabled) { |
| 391 | fatal_error.enabled = 1; |
| 392 | |
| 393 | for (i=0; i < faulthandler_nsignals; i++) { |
| 394 | handler = &faulthandler_handlers[i]; |
| 395 | #ifdef HAVE_SIGACTION |
Victor Stinner | 44e31ba | 2011-04-07 11:39:03 +0200 | [diff] [blame] | 396 | action.sa_handler = faulthandler_fatal_error; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 397 | sigemptyset(&action.sa_mask); |
| 398 | /* Do not prevent the signal from being received from within |
| 399 | its own signal handler */ |
| 400 | action.sa_flags = SA_NODEFER; |
| 401 | #ifdef HAVE_SIGALTSTACK |
| 402 | if (stack.ss_sp != NULL) { |
| 403 | /* Call the signal handler on an alternate signal stack |
| 404 | provided by sigaltstack() */ |
| 405 | action.sa_flags |= SA_ONSTACK; |
| 406 | } |
| 407 | #endif |
| 408 | err = sigaction(handler->signum, &action, &handler->previous); |
| 409 | #else |
| 410 | handler->previous = signal(handler->signum, |
| 411 | faulthandler_fatal_error); |
| 412 | err = (handler->previous == SIG_ERR); |
| 413 | #endif |
| 414 | if (err) { |
| 415 | PyErr_SetFromErrno(PyExc_RuntimeError); |
| 416 | return NULL; |
| 417 | } |
| 418 | handler->enabled = 1; |
| 419 | } |
| 420 | } |
| 421 | Py_RETURN_NONE; |
| 422 | } |
| 423 | |
| 424 | static void |
| 425 | faulthandler_disable(void) |
| 426 | { |
| 427 | unsigned int i; |
| 428 | fault_handler_t *handler; |
| 429 | |
| 430 | if (fatal_error.enabled) { |
| 431 | fatal_error.enabled = 0; |
| 432 | for (i=0; i < faulthandler_nsignals; i++) { |
| 433 | handler = &faulthandler_handlers[i]; |
| 434 | if (!handler->enabled) |
| 435 | continue; |
| 436 | #ifdef HAVE_SIGACTION |
| 437 | (void)sigaction(handler->signum, &handler->previous, NULL); |
| 438 | #else |
| 439 | (void)signal(handler->signum, handler->previous); |
| 440 | #endif |
| 441 | handler->enabled = 0; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | Py_CLEAR(fatal_error.file); |
| 446 | } |
| 447 | |
| 448 | static PyObject* |
| 449 | faulthandler_disable_py(PyObject *self) |
| 450 | { |
| 451 | if (!fatal_error.enabled) { |
| 452 | Py_INCREF(Py_False); |
| 453 | return Py_False; |
| 454 | } |
| 455 | faulthandler_disable(); |
| 456 | Py_INCREF(Py_True); |
| 457 | return Py_True; |
| 458 | } |
| 459 | |
| 460 | static PyObject* |
| 461 | faulthandler_is_enabled(PyObject *self) |
| 462 | { |
| 463 | return PyBool_FromLong(fatal_error.enabled); |
| 464 | } |
| 465 | |
| 466 | #ifdef FAULTHANDLER_LATER |
| 467 | |
| 468 | static void |
| 469 | faulthandler_thread(void *unused) |
| 470 | { |
| 471 | PyLockStatus st; |
| 472 | const char* errmsg; |
| 473 | PyThreadState *current; |
| 474 | int ok; |
Victor Stinner | cf2a807 | 2011-04-19 23:30:57 +0200 | [diff] [blame] | 475 | #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK) |
Victor Stinner | da9edae | 2011-04-04 11:05:21 +0200 | [diff] [blame] | 476 | sigset_t set; |
| 477 | |
| 478 | /* we don't want to receive any signal */ |
| 479 | sigfillset(&set); |
Victor Stinner | da9edae | 2011-04-04 11:05:21 +0200 | [diff] [blame] | 480 | pthread_sigmask(SIG_SETMASK, &set, NULL); |
Victor Stinner | da9edae | 2011-04-04 11:05:21 +0200 | [diff] [blame] | 481 | #endif |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 482 | |
| 483 | do { |
| 484 | st = PyThread_acquire_lock_timed(thread.cancel_event, |
Victor Stinner | 9418932 | 2011-04-08 13:00:31 +0200 | [diff] [blame] | 485 | thread.timeout_us, 0); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 486 | if (st == PY_LOCK_ACQUIRED) { |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 487 | PyThread_release_lock(thread.cancel_event); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 488 | break; |
| 489 | } |
| 490 | /* Timeout => dump traceback */ |
| 491 | assert(st == PY_LOCK_FAILURE); |
| 492 | |
| 493 | /* get the thread holding the GIL, NULL if no thread hold the GIL */ |
Serhiy Storchaka | 53fa8b2 | 2015-02-16 09:40:12 +0200 | [diff] [blame] | 494 | current = (PyThreadState*)_Py_atomic_load_relaxed(&_PyThreadState_Current); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 495 | |
Victor Stinner | c7489a5 | 2015-04-01 18:48:58 +0200 | [diff] [blame] | 496 | _Py_write_noraise(thread.fd, thread.header, (int)thread.header_len); |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 497 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 498 | errmsg = _Py_DumpTracebackThreads(thread.fd, thread.interp, current); |
| 499 | ok = (errmsg == NULL); |
| 500 | |
| 501 | if (thread.exit) |
| 502 | _exit(1); |
| 503 | } while (ok && thread.repeat); |
| 504 | |
| 505 | /* The only way out */ |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 506 | PyThread_release_lock(thread.running); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | static void |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 510 | cancel_dump_traceback_later(void) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 511 | { |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 512 | /* Notify cancellation */ |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 513 | PyThread_release_lock(thread.cancel_event); |
| 514 | |
Victor Stinner | a4d4f1b | 2011-04-01 03:00:05 +0200 | [diff] [blame] | 515 | /* Wait for thread to join */ |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 516 | PyThread_acquire_lock(thread.running, 1); |
| 517 | PyThread_release_lock(thread.running); |
| 518 | |
| 519 | /* The main thread should always hold the cancel_event lock */ |
| 520 | PyThread_acquire_lock(thread.cancel_event, 1); |
| 521 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 522 | Py_CLEAR(thread.file); |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 523 | if (thread.header) { |
Victor Stinner | 49fc8ec | 2013-07-07 23:30:24 +0200 | [diff] [blame] | 524 | PyMem_Free(thread.header); |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 525 | thread.header = NULL; |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | static char* |
| 530 | format_timeout(double timeout) |
| 531 | { |
| 532 | unsigned long us, sec, min, hour; |
| 533 | double intpart, fracpart; |
| 534 | char buffer[100]; |
| 535 | |
| 536 | fracpart = modf(timeout, &intpart); |
| 537 | sec = (unsigned long)intpart; |
| 538 | us = (unsigned long)(fracpart * 1e6); |
| 539 | min = sec / 60; |
| 540 | sec %= 60; |
| 541 | hour = min / 60; |
| 542 | min %= 60; |
| 543 | |
| 544 | if (us != 0) |
| 545 | PyOS_snprintf(buffer, sizeof(buffer), |
| 546 | "Timeout (%lu:%02lu:%02lu.%06lu)!\n", |
| 547 | hour, min, sec, us); |
| 548 | else |
| 549 | PyOS_snprintf(buffer, sizeof(buffer), |
| 550 | "Timeout (%lu:%02lu:%02lu)!\n", |
| 551 | hour, min, sec); |
| 552 | |
Victor Stinner | 49fc8ec | 2013-07-07 23:30:24 +0200 | [diff] [blame] | 553 | return _PyMem_Strdup(buffer); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | static PyObject* |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 557 | faulthandler_dump_traceback_later(PyObject *self, |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 558 | PyObject *args, PyObject *kwargs) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 559 | { |
| 560 | static char *kwlist[] = {"timeout", "repeat", "file", "exit", NULL}; |
| 561 | double timeout; |
Victor Stinner | 9418932 | 2011-04-08 13:00:31 +0200 | [diff] [blame] | 562 | PY_TIMEOUT_T timeout_us; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 563 | int repeat = 0; |
| 564 | PyObject *file = NULL; |
| 565 | int fd; |
| 566 | int exit = 0; |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 567 | PyThreadState *tstate; |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 568 | char *header; |
| 569 | size_t header_len; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 570 | |
| 571 | if (!PyArg_ParseTupleAndKeywords(args, kwargs, |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 572 | "d|iOi:dump_traceback_later", kwlist, |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 573 | &timeout, &repeat, &file, &exit)) |
| 574 | return NULL; |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 575 | if ((timeout * 1e6) >= (double) PY_TIMEOUT_MAX) { |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 576 | PyErr_SetString(PyExc_OverflowError, "timeout value is too large"); |
| 577 | return NULL; |
| 578 | } |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 579 | timeout_us = (PY_TIMEOUT_T)(timeout * 1e6); |
Victor Stinner | 9418932 | 2011-04-08 13:00:31 +0200 | [diff] [blame] | 580 | if (timeout_us <= 0) { |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 581 | PyErr_SetString(PyExc_ValueError, "timeout must be greater than 0"); |
| 582 | return NULL; |
| 583 | } |
| 584 | |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 585 | tstate = get_thread_state(); |
| 586 | if (tstate == NULL) |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 587 | return NULL; |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 588 | |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 589 | fd = faulthandler_get_fileno(&file); |
| 590 | if (fd < 0) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 591 | return NULL; |
| 592 | |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 593 | /* format the timeout */ |
| 594 | header = format_timeout(timeout); |
| 595 | if (header == NULL) |
| 596 | return PyErr_NoMemory(); |
| 597 | header_len = strlen(header); |
| 598 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 599 | /* Cancel previous thread, if running */ |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 600 | cancel_dump_traceback_later(); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 601 | |
| 602 | Py_XDECREF(thread.file); |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 603 | Py_XINCREF(file); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 604 | thread.file = file; |
| 605 | thread.fd = fd; |
Victor Stinner | 9418932 | 2011-04-08 13:00:31 +0200 | [diff] [blame] | 606 | thread.timeout_us = timeout_us; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 607 | thread.repeat = repeat; |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 608 | thread.interp = tstate->interp; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 609 | thread.exit = exit; |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 610 | thread.header = header; |
| 611 | thread.header_len = header_len; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 612 | |
| 613 | /* Arm these locks to serve as events when released */ |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 614 | PyThread_acquire_lock(thread.running, 1); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 615 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 616 | if (PyThread_start_new_thread(faulthandler_thread, NULL) == -1) { |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 617 | PyThread_release_lock(thread.running); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 618 | Py_CLEAR(thread.file); |
Victor Stinner | 49fc8ec | 2013-07-07 23:30:24 +0200 | [diff] [blame] | 619 | PyMem_Free(header); |
Victor Stinner | c790a53 | 2011-04-08 13:39:59 +0200 | [diff] [blame] | 620 | thread.header = NULL; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 621 | PyErr_SetString(PyExc_RuntimeError, |
| 622 | "unable to start watchdog thread"); |
| 623 | return NULL; |
| 624 | } |
| 625 | |
| 626 | Py_RETURN_NONE; |
| 627 | } |
| 628 | |
| 629 | static PyObject* |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 630 | faulthandler_cancel_dump_traceback_later_py(PyObject *self) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 631 | { |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 632 | cancel_dump_traceback_later(); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 633 | Py_RETURN_NONE; |
| 634 | } |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 635 | #endif /* FAULTHANDLER_LATER */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 636 | |
| 637 | #ifdef FAULTHANDLER_USER |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 638 | static int |
| 639 | faulthandler_register(int signum, int chain, _Py_sighandler_t *p_previous) |
| 640 | { |
| 641 | #ifdef HAVE_SIGACTION |
| 642 | struct sigaction action; |
| 643 | action.sa_handler = faulthandler_user; |
| 644 | sigemptyset(&action.sa_mask); |
| 645 | /* if the signal is received while the kernel is executing a system |
| 646 | call, try to restart the system call instead of interrupting it and |
| 647 | return EINTR. */ |
| 648 | action.sa_flags = SA_RESTART; |
| 649 | if (chain) { |
| 650 | /* do not prevent the signal from being received from within its |
| 651 | own signal handler */ |
| 652 | action.sa_flags = SA_NODEFER; |
| 653 | } |
| 654 | #ifdef HAVE_SIGALTSTACK |
| 655 | if (stack.ss_sp != NULL) { |
| 656 | /* Call the signal handler on an alternate signal stack |
| 657 | provided by sigaltstack() */ |
| 658 | action.sa_flags |= SA_ONSTACK; |
| 659 | } |
| 660 | #endif |
| 661 | return sigaction(signum, &action, p_previous); |
| 662 | #else |
| 663 | _Py_sighandler_t previous; |
| 664 | previous = signal(signum, faulthandler_user); |
| 665 | if (p_previous != NULL) |
| 666 | *p_previous = previous; |
| 667 | return (previous == SIG_ERR); |
| 668 | #endif |
| 669 | } |
| 670 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 671 | /* Handler of user signals (e.g. SIGUSR1). |
| 672 | |
| 673 | Dump the traceback of the current thread, or of all threads if |
| 674 | thread.all_threads is true. |
| 675 | |
| 676 | This function is signal safe and should only call signal safe functions. */ |
| 677 | |
| 678 | static void |
| 679 | faulthandler_user(int signum) |
| 680 | { |
| 681 | user_signal_t *user; |
Victor Stinner | c925617 | 2011-05-07 12:20:11 +0200 | [diff] [blame] | 682 | int save_errno = errno; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 683 | |
| 684 | user = &user_signals[signum]; |
| 685 | if (!user->enabled) |
| 686 | return; |
| 687 | |
Victor Stinner | c7489a5 | 2015-04-01 18:48:58 +0200 | [diff] [blame] | 688 | faulthandler_dump_traceback(user->fd, user->all_threads, user->interp); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 689 | |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 690 | #ifdef HAVE_SIGACTION |
| 691 | if (user->chain) { |
| 692 | (void)sigaction(signum, &user->previous, NULL); |
Victor Stinner | 3cc635d | 2012-08-09 02:43:41 +0200 | [diff] [blame] | 693 | errno = save_errno; |
| 694 | |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 695 | /* call the previous signal handler */ |
| 696 | raise(signum); |
Victor Stinner | 3cc635d | 2012-08-09 02:43:41 +0200 | [diff] [blame] | 697 | |
| 698 | save_errno = errno; |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 699 | (void)faulthandler_register(signum, user->chain, NULL); |
Victor Stinner | 3cc635d | 2012-08-09 02:43:41 +0200 | [diff] [blame] | 700 | errno = save_errno; |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 701 | } |
| 702 | #else |
| 703 | if (user->chain) { |
Victor Stinner | 3cc635d | 2012-08-09 02:43:41 +0200 | [diff] [blame] | 704 | errno = save_errno; |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 705 | /* call the previous signal handler */ |
| 706 | user->previous(signum); |
| 707 | } |
| 708 | #endif |
Victor Stinner | 44378d4 | 2011-04-01 15:37:12 +0200 | [diff] [blame] | 709 | } |
| 710 | |
| 711 | static int |
| 712 | check_signum(int signum) |
| 713 | { |
| 714 | unsigned int i; |
| 715 | |
| 716 | for (i=0; i < faulthandler_nsignals; i++) { |
| 717 | if (faulthandler_handlers[i].signum == signum) { |
| 718 | PyErr_Format(PyExc_RuntimeError, |
| 719 | "signal %i cannot be registered, " |
| 720 | "use enable() instead", |
| 721 | signum); |
| 722 | return 0; |
| 723 | } |
| 724 | } |
| 725 | if (signum < 1 || NSIG <= signum) { |
| 726 | PyErr_SetString(PyExc_ValueError, "signal number out of range"); |
| 727 | return 0; |
| 728 | } |
| 729 | return 1; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | static PyObject* |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 733 | faulthandler_register_py(PyObject *self, |
| 734 | PyObject *args, PyObject *kwargs) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 735 | { |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 736 | static char *kwlist[] = {"signum", "file", "all_threads", "chain", NULL}; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 737 | int signum; |
| 738 | PyObject *file = NULL; |
Victor Stinner | 7bba62f | 2011-05-07 12:43:00 +0200 | [diff] [blame] | 739 | int all_threads = 1; |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 740 | int chain = 0; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 741 | int fd; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 742 | user_signal_t *user; |
| 743 | _Py_sighandler_t previous; |
Victor Stinner | 44378d4 | 2011-04-01 15:37:12 +0200 | [diff] [blame] | 744 | PyThreadState *tstate; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 745 | int err; |
| 746 | |
| 747 | if (!PyArg_ParseTupleAndKeywords(args, kwargs, |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 748 | "i|Oii:register", kwlist, |
| 749 | &signum, &file, &all_threads, &chain)) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 750 | return NULL; |
| 751 | |
Victor Stinner | 44378d4 | 2011-04-01 15:37:12 +0200 | [diff] [blame] | 752 | if (!check_signum(signum)) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 753 | return NULL; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 754 | |
Victor Stinner | a4de6d8 | 2011-04-09 00:47:23 +0200 | [diff] [blame] | 755 | tstate = get_thread_state(); |
| 756 | if (tstate == NULL) |
Victor Stinner | 44378d4 | 2011-04-01 15:37:12 +0200 | [diff] [blame] | 757 | return NULL; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 758 | |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 759 | fd = faulthandler_get_fileno(&file); |
| 760 | if (fd < 0) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 761 | return NULL; |
| 762 | |
| 763 | if (user_signals == NULL) { |
Victor Stinner | 49fc8ec | 2013-07-07 23:30:24 +0200 | [diff] [blame] | 764 | user_signals = PyMem_Malloc(NSIG * sizeof(user_signal_t)); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 765 | if (user_signals == NULL) |
| 766 | return PyErr_NoMemory(); |
Victor Stinner | 49fc8ec | 2013-07-07 23:30:24 +0200 | [diff] [blame] | 767 | memset(user_signals, 0, NSIG * sizeof(user_signal_t)); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 768 | } |
| 769 | user = &user_signals[signum]; |
| 770 | |
| 771 | if (!user->enabled) { |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 772 | err = faulthandler_register(signum, chain, &previous); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 773 | if (err) { |
| 774 | PyErr_SetFromErrno(PyExc_OSError); |
| 775 | return NULL; |
| 776 | } |
Victor Stinner | 8d37954 | 2013-07-02 00:14:56 +0200 | [diff] [blame] | 777 | |
| 778 | user->previous = previous; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | Py_XDECREF(user->file); |
Victor Stinner | 95bb714 | 2015-03-12 15:32:03 +0100 | [diff] [blame] | 782 | Py_XINCREF(file); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 783 | user->file = file; |
| 784 | user->fd = fd; |
| 785 | user->all_threads = all_threads; |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 786 | user->chain = chain; |
Victor Stinner | 44378d4 | 2011-04-01 15:37:12 +0200 | [diff] [blame] | 787 | user->interp = tstate->interp; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 788 | user->enabled = 1; |
| 789 | |
| 790 | Py_RETURN_NONE; |
| 791 | } |
| 792 | |
| 793 | static int |
| 794 | faulthandler_unregister(user_signal_t *user, int signum) |
| 795 | { |
Victor Stinner | a01ca12 | 2011-04-01 12:56:17 +0200 | [diff] [blame] | 796 | if (!user->enabled) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 797 | return 0; |
| 798 | user->enabled = 0; |
| 799 | #ifdef HAVE_SIGACTION |
| 800 | (void)sigaction(signum, &user->previous, NULL); |
| 801 | #else |
| 802 | (void)signal(signum, user->previous); |
| 803 | #endif |
| 804 | Py_CLEAR(user->file); |
| 805 | user->fd = -1; |
| 806 | return 1; |
| 807 | } |
| 808 | |
| 809 | static PyObject* |
| 810 | faulthandler_unregister_py(PyObject *self, PyObject *args) |
| 811 | { |
| 812 | int signum; |
| 813 | user_signal_t *user; |
| 814 | int change; |
| 815 | |
| 816 | if (!PyArg_ParseTuple(args, "i:unregister", &signum)) |
| 817 | return NULL; |
| 818 | |
Victor Stinner | 44378d4 | 2011-04-01 15:37:12 +0200 | [diff] [blame] | 819 | if (!check_signum(signum)) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 820 | return NULL; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 821 | |
Victor Stinner | cfa7123 | 2011-04-08 12:48:15 +0200 | [diff] [blame] | 822 | if (user_signals == NULL) |
| 823 | Py_RETURN_FALSE; |
| 824 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 825 | user = &user_signals[signum]; |
| 826 | change = faulthandler_unregister(user, signum); |
| 827 | return PyBool_FromLong(change); |
| 828 | } |
| 829 | #endif /* FAULTHANDLER_USER */ |
| 830 | |
| 831 | |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 832 | static void |
| 833 | faulthandler_suppress_crash_report(void) |
| 834 | { |
| 835 | #ifdef MS_WINDOWS |
| 836 | UINT mode; |
| 837 | |
| 838 | /* Configure Windows to not display the Windows Error Reporting dialog */ |
| 839 | mode = SetErrorMode(SEM_NOGPFAULTERRORBOX); |
| 840 | SetErrorMode(mode | SEM_NOGPFAULTERRORBOX); |
| 841 | #endif |
| 842 | |
| 843 | #ifdef HAVE_SYS_RESOURCE_H |
| 844 | struct rlimit rl; |
| 845 | |
| 846 | /* Disable creation of core dump */ |
| 847 | if (getrlimit(RLIMIT_CORE, &rl) != 0) { |
| 848 | rl.rlim_cur = 0; |
| 849 | setrlimit(RLIMIT_CORE, &rl); |
| 850 | } |
| 851 | #endif |
| 852 | |
| 853 | #ifdef _MSC_VER |
| 854 | /* Visual Studio: configure abort() to not display an error message nor |
| 855 | open a popup asking to report the fault. */ |
| 856 | _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT); |
| 857 | #endif |
| 858 | } |
| 859 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 860 | static PyObject * |
| 861 | faulthandler_read_null(PyObject *self, PyObject *args) |
| 862 | { |
Victor Stinner | a247720 | 2012-01-30 00:07:43 +0100 | [diff] [blame] | 863 | volatile int *x; |
| 864 | volatile int y; |
Victor Stinner | a247720 | 2012-01-30 00:07:43 +0100 | [diff] [blame] | 865 | |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 866 | faulthandler_suppress_crash_report(); |
Victor Stinner | a247720 | 2012-01-30 00:07:43 +0100 | [diff] [blame] | 867 | x = NULL; |
Victor Stinner | 5083828 | 2014-09-30 13:54:14 +0200 | [diff] [blame] | 868 | y = *x; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 869 | return PyLong_FromLong(y); |
| 870 | |
| 871 | } |
| 872 | |
Victor Stinner | 5083828 | 2014-09-30 13:54:14 +0200 | [diff] [blame] | 873 | static void |
| 874 | faulthandler_raise_sigsegv(void) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 875 | { |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 876 | faulthandler_suppress_crash_report(); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 877 | #if defined(MS_WINDOWS) |
Victor Stinner | bc6a4db | 2011-04-01 12:08:57 +0200 | [diff] [blame] | 878 | /* For SIGSEGV, faulthandler_fatal_error() restores the previous signal |
| 879 | handler and then gives back the execution flow to the program (without |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 880 | explicitly calling the previous error handler). In a normal case, the |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 881 | SIGSEGV was raised by the kernel because of a fault, and so if the |
| 882 | program retries to execute the same instruction, the fault will be |
| 883 | raised again. |
| 884 | |
| 885 | Here the fault is simulated by a fake SIGSEGV signal raised by the |
| 886 | application. We have to raise SIGSEGV at lease twice: once for |
| 887 | faulthandler_fatal_error(), and one more time for the previous signal |
| 888 | handler. */ |
| 889 | while(1) |
| 890 | raise(SIGSEGV); |
| 891 | #else |
| 892 | raise(SIGSEGV); |
| 893 | #endif |
Victor Stinner | 5083828 | 2014-09-30 13:54:14 +0200 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | static PyObject * |
| 897 | faulthandler_sigsegv(PyObject *self, PyObject *args) |
| 898 | { |
| 899 | int release_gil = 0; |
| 900 | if (!PyArg_ParseTuple(args, "|i:_read_null", &release_gil)) |
| 901 | return NULL; |
| 902 | |
| 903 | if (release_gil) { |
| 904 | Py_BEGIN_ALLOW_THREADS |
| 905 | faulthandler_raise_sigsegv(); |
| 906 | Py_END_ALLOW_THREADS |
| 907 | } else { |
| 908 | faulthandler_raise_sigsegv(); |
| 909 | } |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 910 | Py_RETURN_NONE; |
| 911 | } |
| 912 | |
| 913 | static PyObject * |
| 914 | faulthandler_sigfpe(PyObject *self, PyObject *args) |
| 915 | { |
| 916 | /* Do an integer division by zero: raise a SIGFPE on Intel CPU, but not on |
| 917 | PowerPC. Use volatile to disable compile-time optimizations. */ |
| 918 | volatile int x = 1, y = 0, z; |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 919 | faulthandler_suppress_crash_report(); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 920 | z = x / y; |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 921 | /* If the division by zero didn't raise a SIGFPE (e.g. on PowerPC), |
| 922 | raise it manually. */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 923 | raise(SIGFPE); |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 924 | /* This line is never reached, but we pretend to make something with z |
| 925 | to silence a compiler warning. */ |
Victor Stinner | e0c9a75 | 2011-05-09 14:44:26 +0200 | [diff] [blame] | 926 | return PyLong_FromLong(z); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 927 | } |
| 928 | |
Victor Stinner | d727e23 | 2011-04-01 12:13:55 +0200 | [diff] [blame] | 929 | static PyObject * |
| 930 | faulthandler_sigabrt(PyObject *self, PyObject *args) |
| 931 | { |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 932 | faulthandler_suppress_crash_report(); |
Victor Stinner | 00bc6cc | 2011-05-10 01:30:03 +0200 | [diff] [blame] | 933 | abort(); |
Victor Stinner | d727e23 | 2011-04-01 12:13:55 +0200 | [diff] [blame] | 934 | Py_RETURN_NONE; |
| 935 | } |
| 936 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 937 | static PyObject * |
| 938 | faulthandler_fatal_error_py(PyObject *self, PyObject *args) |
| 939 | { |
| 940 | char *message; |
| 941 | if (!PyArg_ParseTuple(args, "y:fatal_error", &message)) |
| 942 | return NULL; |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 943 | faulthandler_suppress_crash_report(); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 944 | Py_FatalError(message); |
| 945 | Py_RETURN_NONE; |
| 946 | } |
| 947 | |
| 948 | #if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION) |
Victor Stinner | 19276f1 | 2015-03-23 21:20:27 +0100 | [diff] [blame] | 949 | #ifdef __INTEL_COMPILER |
| 950 | /* Issue #23654: Turn off ICC's tail call optimization for the |
| 951 | * stack_overflow generator. ICC turns the recursive tail call into |
| 952 | * a loop. */ |
| 953 | # pragma intel optimization_level 0 |
| 954 | #endif |
| 955 | static |
| 956 | Py_uintptr_t |
Victor Stinner | 7a5567a | 2015-02-11 14:23:35 +0100 | [diff] [blame] | 957 | stack_overflow(Py_uintptr_t min_sp, Py_uintptr_t max_sp, size_t *depth) |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 958 | { |
| 959 | /* allocate 4096 bytes on the stack at each call */ |
| 960 | unsigned char buffer[4096]; |
Victor Stinner | 7a5567a | 2015-02-11 14:23:35 +0100 | [diff] [blame] | 961 | Py_uintptr_t sp = (Py_uintptr_t)&buffer; |
Victor Stinner | f048075 | 2011-03-31 11:34:08 +0200 | [diff] [blame] | 962 | *depth += 1; |
| 963 | if (sp < min_sp || max_sp < sp) |
| 964 | return sp; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 965 | buffer[0] = 1; |
Victor Stinner | f048075 | 2011-03-31 11:34:08 +0200 | [diff] [blame] | 966 | buffer[4095] = 0; |
| 967 | return stack_overflow(min_sp, max_sp, depth); |
| 968 | } |
| 969 | |
| 970 | static PyObject * |
| 971 | faulthandler_stack_overflow(PyObject *self) |
| 972 | { |
| 973 | size_t depth, size; |
Victor Stinner | 7a5567a | 2015-02-11 14:23:35 +0100 | [diff] [blame] | 974 | Py_uintptr_t sp = (Py_uintptr_t)&depth; |
| 975 | Py_uintptr_t stop; |
Victor Stinner | f048075 | 2011-03-31 11:34:08 +0200 | [diff] [blame] | 976 | |
Victor Stinner | 7a39912 | 2014-09-30 13:40:12 +0200 | [diff] [blame] | 977 | faulthandler_suppress_crash_report(); |
Victor Stinner | f048075 | 2011-03-31 11:34:08 +0200 | [diff] [blame] | 978 | depth = 0; |
| 979 | stop = stack_overflow(sp - STACK_OVERFLOW_MAX_SIZE, |
| 980 | sp + STACK_OVERFLOW_MAX_SIZE, |
| 981 | &depth); |
| 982 | if (sp < stop) |
| 983 | size = stop - sp; |
| 984 | else |
| 985 | size = sp - stop; |
| 986 | PyErr_Format(PyExc_RuntimeError, |
| 987 | "unable to raise a stack overflow (allocated %zu bytes " |
| 988 | "on the stack, %zu recursive calls)", |
| 989 | size, depth); |
| 990 | return NULL; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 991 | } |
| 992 | #endif |
| 993 | |
| 994 | |
| 995 | static int |
| 996 | faulthandler_traverse(PyObject *module, visitproc visit, void *arg) |
| 997 | { |
| 998 | #ifdef FAULTHANDLER_USER |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 999 | unsigned int signum; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1000 | #endif |
| 1001 | |
| 1002 | #ifdef FAULTHANDLER_LATER |
| 1003 | Py_VISIT(thread.file); |
| 1004 | #endif |
| 1005 | #ifdef FAULTHANDLER_USER |
| 1006 | if (user_signals != NULL) { |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 1007 | for (signum=0; signum < NSIG; signum++) |
| 1008 | Py_VISIT(user_signals[signum].file); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1009 | } |
| 1010 | #endif |
| 1011 | Py_VISIT(fatal_error.file); |
| 1012 | return 0; |
| 1013 | } |
| 1014 | |
| 1015 | PyDoc_STRVAR(module_doc, |
| 1016 | "faulthandler module."); |
| 1017 | |
| 1018 | static PyMethodDef module_methods[] = { |
| 1019 | {"enable", |
| 1020 | (PyCFunction)faulthandler_enable, METH_VARARGS|METH_KEYWORDS, |
Victor Stinner | 7bba62f | 2011-05-07 12:43:00 +0200 | [diff] [blame] | 1021 | PyDoc_STR("enable(file=sys.stderr, all_threads=True): " |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1022 | "enable the fault handler")}, |
| 1023 | {"disable", (PyCFunction)faulthandler_disable_py, METH_NOARGS, |
| 1024 | PyDoc_STR("disable(): disable the fault handler")}, |
| 1025 | {"is_enabled", (PyCFunction)faulthandler_is_enabled, METH_NOARGS, |
| 1026 | PyDoc_STR("is_enabled()->bool: check if the handler is enabled")}, |
| 1027 | {"dump_traceback", |
| 1028 | (PyCFunction)faulthandler_dump_traceback_py, METH_VARARGS|METH_KEYWORDS, |
Victor Stinner | 7bba62f | 2011-05-07 12:43:00 +0200 | [diff] [blame] | 1029 | PyDoc_STR("dump_traceback(file=sys.stderr, all_threads=True): " |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1030 | "dump the traceback of the current thread, or of all threads " |
| 1031 | "if all_threads is True, into file")}, |
| 1032 | #ifdef FAULTHANDLER_LATER |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 1033 | {"dump_traceback_later", |
| 1034 | (PyCFunction)faulthandler_dump_traceback_later, METH_VARARGS|METH_KEYWORDS, |
| 1035 | PyDoc_STR("dump_traceback_later(timeout, repeat=False, file=sys.stderrn, exit=False):\n" |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1036 | "dump the traceback of all threads in timeout seconds,\n" |
Victor Stinner | 9699440 | 2011-04-07 11:37:19 +0200 | [diff] [blame] | 1037 | "or each timeout seconds if repeat is True. If exit is True, " |
| 1038 | "call _exit(1) which is not safe.")}, |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 1039 | {"cancel_dump_traceback_later", |
| 1040 | (PyCFunction)faulthandler_cancel_dump_traceback_later_py, METH_NOARGS, |
| 1041 | PyDoc_STR("cancel_dump_traceback_later():\ncancel the previous call " |
| 1042 | "to dump_traceback_later().")}, |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1043 | #endif |
| 1044 | |
| 1045 | #ifdef FAULTHANDLER_USER |
| 1046 | {"register", |
Victor Stinner | a9a9dab | 2011-07-13 23:39:53 +0200 | [diff] [blame] | 1047 | (PyCFunction)faulthandler_register_py, METH_VARARGS|METH_KEYWORDS, |
| 1048 | PyDoc_STR("register(signum, file=sys.stderr, all_threads=True, chain=False): " |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1049 | "register an handler for the signal 'signum': dump the " |
| 1050 | "traceback of the current thread, or of all threads if " |
| 1051 | "all_threads is True, into file")}, |
| 1052 | {"unregister", |
| 1053 | faulthandler_unregister_py, METH_VARARGS|METH_KEYWORDS, |
| 1054 | PyDoc_STR("unregister(signum): unregister the handler of the signal " |
| 1055 | "'signum' registered by register()")}, |
| 1056 | #endif |
| 1057 | |
Victor Stinner | 5083828 | 2014-09-30 13:54:14 +0200 | [diff] [blame] | 1058 | {"_read_null", faulthandler_read_null, METH_NOARGS, |
| 1059 | PyDoc_STR("_read_null(): read from NULL, raise " |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1060 | "a SIGSEGV or SIGBUS signal depending on the platform")}, |
| 1061 | {"_sigsegv", faulthandler_sigsegv, METH_VARARGS, |
Victor Stinner | 5083828 | 2014-09-30 13:54:14 +0200 | [diff] [blame] | 1062 | PyDoc_STR("_sigsegv(release_gil=False): raise a SIGSEGV signal")}, |
Victor Stinner | 9db521c | 2014-09-30 13:49:09 +0200 | [diff] [blame] | 1063 | {"_sigabrt", faulthandler_sigabrt, METH_NOARGS, |
Victor Stinner | d727e23 | 2011-04-01 12:13:55 +0200 | [diff] [blame] | 1064 | PyDoc_STR("_sigabrt(): raise a SIGABRT signal")}, |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1065 | {"_sigfpe", (PyCFunction)faulthandler_sigfpe, METH_NOARGS, |
| 1066 | PyDoc_STR("_sigfpe(): raise a SIGFPE signal")}, |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1067 | {"_fatal_error", faulthandler_fatal_error_py, METH_VARARGS, |
| 1068 | PyDoc_STR("_fatal_error(message): call Py_FatalError(message)")}, |
| 1069 | #if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION) |
| 1070 | {"_stack_overflow", (PyCFunction)faulthandler_stack_overflow, METH_NOARGS, |
| 1071 | PyDoc_STR("_stack_overflow(): recursive call to raise a stack overflow")}, |
| 1072 | #endif |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 1073 | {NULL, NULL} /* sentinel */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1074 | }; |
| 1075 | |
| 1076 | static struct PyModuleDef module_def = { |
| 1077 | PyModuleDef_HEAD_INIT, |
| 1078 | "faulthandler", |
| 1079 | module_doc, |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 1080 | 0, /* non-negative size to be able to unload the module */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1081 | module_methods, |
| 1082 | NULL, |
| 1083 | faulthandler_traverse, |
| 1084 | NULL, |
| 1085 | NULL |
| 1086 | }; |
| 1087 | |
| 1088 | PyMODINIT_FUNC |
| 1089 | PyInit_faulthandler(void) |
| 1090 | { |
| 1091 | return PyModule_Create(&module_def); |
| 1092 | } |
| 1093 | |
Victor Stinner | 410dd7d | 2011-05-11 20:56:08 +0200 | [diff] [blame] | 1094 | /* Call faulthandler.enable() if the PYTHONFAULTHANDLER environment variable |
| 1095 | is defined, or if sys._xoptions has a 'faulthandler' key. */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1096 | |
| 1097 | static int |
| 1098 | faulthandler_env_options(void) |
| 1099 | { |
| 1100 | PyObject *xoptions, *key, *module, *res; |
Victor Stinner | 8898350 | 2013-09-08 11:36:23 +0200 | [diff] [blame] | 1101 | char *p; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1102 | |
Victor Stinner | 8898350 | 2013-09-08 11:36:23 +0200 | [diff] [blame] | 1103 | if (!((p = Py_GETENV("PYTHONFAULTHANDLER")) && *p != '\0')) { |
| 1104 | /* PYTHONFAULTHANDLER environment variable is missing |
| 1105 | or an empty string */ |
Victor Stinner | 25095b2 | 2011-05-26 13:47:08 +0200 | [diff] [blame] | 1106 | int has_key; |
| 1107 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1108 | xoptions = PySys_GetXOptions(); |
| 1109 | if (xoptions == NULL) |
| 1110 | return -1; |
| 1111 | |
| 1112 | key = PyUnicode_FromString("faulthandler"); |
| 1113 | if (key == NULL) |
| 1114 | return -1; |
| 1115 | |
Victor Stinner | 25095b2 | 2011-05-26 13:47:08 +0200 | [diff] [blame] | 1116 | has_key = PyDict_Contains(xoptions, key); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1117 | Py_DECREF(key); |
Serhiy Storchaka | fa494fd | 2015-05-30 17:45:22 +0300 | [diff] [blame] | 1118 | if (has_key <= 0) |
| 1119 | return has_key; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1120 | } |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1121 | |
| 1122 | module = PyImport_ImportModule("faulthandler"); |
| 1123 | if (module == NULL) { |
| 1124 | return -1; |
| 1125 | } |
Martin v. Löwis | afe55bb | 2011-10-09 10:38:36 +0200 | [diff] [blame] | 1126 | res = _PyObject_CallMethodId(module, &PyId_enable, ""); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1127 | Py_DECREF(module); |
| 1128 | if (res == NULL) |
| 1129 | return -1; |
| 1130 | Py_DECREF(res); |
| 1131 | return 0; |
| 1132 | } |
| 1133 | |
| 1134 | int _PyFaulthandler_Init(void) |
| 1135 | { |
| 1136 | #ifdef HAVE_SIGALTSTACK |
| 1137 | int err; |
| 1138 | |
| 1139 | /* Try to allocate an alternate stack for faulthandler() signal handler to |
| 1140 | * be able to allocate memory on the stack, even on a stack overflow. If it |
| 1141 | * fails, ignore the error. */ |
| 1142 | stack.ss_flags = 0; |
| 1143 | stack.ss_size = SIGSTKSZ; |
| 1144 | stack.ss_sp = PyMem_Malloc(stack.ss_size); |
| 1145 | if (stack.ss_sp != NULL) { |
| 1146 | err = sigaltstack(&stack, NULL); |
| 1147 | if (err) { |
| 1148 | PyMem_Free(stack.ss_sp); |
| 1149 | stack.ss_sp = NULL; |
| 1150 | } |
| 1151 | } |
| 1152 | #endif |
| 1153 | #ifdef FAULTHANDLER_LATER |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1154 | thread.file = NULL; |
| 1155 | thread.cancel_event = PyThread_allocate_lock(); |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 1156 | thread.running = PyThread_allocate_lock(); |
| 1157 | if (!thread.cancel_event || !thread.running) { |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1158 | PyErr_SetString(PyExc_RuntimeError, |
| 1159 | "could not allocate locks for faulthandler"); |
| 1160 | return -1; |
| 1161 | } |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 1162 | PyThread_acquire_lock(thread.cancel_event, 1); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1163 | #endif |
| 1164 | |
| 1165 | return faulthandler_env_options(); |
| 1166 | } |
| 1167 | |
| 1168 | void _PyFaulthandler_Fini(void) |
| 1169 | { |
| 1170 | #ifdef FAULTHANDLER_USER |
Victor Stinner | a01ca12 | 2011-04-01 12:56:17 +0200 | [diff] [blame] | 1171 | unsigned int signum; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1172 | #endif |
| 1173 | |
| 1174 | #ifdef FAULTHANDLER_LATER |
| 1175 | /* later */ |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1176 | if (thread.cancel_event) { |
Georg Brandl | deb92b5 | 2012-09-22 08:58:55 +0200 | [diff] [blame] | 1177 | cancel_dump_traceback_later(); |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 1178 | PyThread_release_lock(thread.cancel_event); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1179 | PyThread_free_lock(thread.cancel_event); |
| 1180 | thread.cancel_event = NULL; |
| 1181 | } |
Victor Stinner | de10f40 | 2011-04-08 12:57:06 +0200 | [diff] [blame] | 1182 | if (thread.running) { |
| 1183 | PyThread_free_lock(thread.running); |
| 1184 | thread.running = NULL; |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1185 | } |
| 1186 | #endif |
| 1187 | |
| 1188 | #ifdef FAULTHANDLER_USER |
| 1189 | /* user */ |
| 1190 | if (user_signals != NULL) { |
Victor Stinner | a01ca12 | 2011-04-01 12:56:17 +0200 | [diff] [blame] | 1191 | for (signum=0; signum < NSIG; signum++) |
| 1192 | faulthandler_unregister(&user_signals[signum], signum); |
Victor Stinner | 49fc8ec | 2013-07-07 23:30:24 +0200 | [diff] [blame] | 1193 | PyMem_Free(user_signals); |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 1194 | user_signals = NULL; |
| 1195 | } |
| 1196 | #endif |
| 1197 | |
| 1198 | /* fatal */ |
| 1199 | faulthandler_disable(); |
| 1200 | #ifdef HAVE_SIGALTSTACK |
| 1201 | if (stack.ss_sp != NULL) { |
| 1202 | PyMem_Free(stack.ss_sp); |
| 1203 | stack.ss_sp = NULL; |
| 1204 | } |
| 1205 | #endif |
| 1206 | } |