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qcrashhandler.cpp

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1 /**************************************************************************** -

2 ** -

4 ** Contact: https://www.qt.io/licensing/ -

5 ** -

6 ** This file is part of the QtCore module of the Qt Toolkit. -

7 ** -

8 ** $QT_BEGIN_LICENSE:LGPL$ -

9 ** Commercial License Usage -

10 ** Licensees holding valid commercial Qt licenses may use this file in -

11 ** accordance with the commercial license agreement provided with the -

12 ** Software or, alternatively, in accordance with the terms contained in -

13 ** a written agreement between you and The Qt Company. For licensing terms -

14 ** and conditions see https://www.qt.io/terms-conditions. For further -

15 ** information use the contact form at https://www.qt.io/contact-us. -

16 ** -

17 ** GNU Lesser General Public License Usage -

18 ** Alternatively, this file may be used under the terms of the GNU Lesser -

19 ** General Public License version 3 as published by the Free Software -

20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the -

21 ** packaging of this file. Please review the following information to -

22 ** ensure the GNU Lesser General Public License version 3 requirements -

23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. -

24 ** -

25 ** GNU General Public License Usage -

26 ** Alternatively, this file may be used under the terms of the GNU -

27 ** General Public License version 2.0 or (at your option) the GNU General -

28 ** Public license version 3 or any later version approved by the KDE Free -

29 ** Qt Foundation. The licenses are as published by the Free Software -

30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 -

31 ** included in the packaging of this file. Please review the following -

32 ** information to ensure the GNU General Public License requirements will -

33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and -

34 ** https://www.gnu.org/licenses/gpl-3.0.html. -

35 ** -

36 ** $QT_END_LICENSE$ -

37 ** -

38 ****************************************************************************/ -

39 -

40 /************************************************************************* -

41 * -

42 * stacktrace.c 1.2 1998/12/21 -

43 * -

45 * -

46 * Permission to use, copy, modify, and distribute this software for any -

47 * purpose with or without fee is hereby granted, provided that the above -

48 * copyright notice and this permission notice appear in all copies. -

49 * -

50 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED -

51 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF -

52 * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND -

53 * CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER. -

54 * -

55 ************************************************************************/ -

56 -

57 #include "qplatformdefs.h" -

58 #include "private/qcrashhandler_p.h" -

59 #include "qbytearray.h" // for qvsnprintf() -

60 -

61 #ifndef QT_NO_CRASHHANDLER -

62 -

63 #include <stdio.h> -

64 #include <signal.h> -

65 #include <stdlib.h> -

66 -

67 QT_BEGIN_NAMESPACE -

68 -

69 QtCrashHandler QSegfaultHandler::callback = 0; -

70 -

71 #if defined(__GLIBC__) && (__GLIBC__ >= 2) && !defined(__UCLIBC__) && !defined(QT_LINUXBASE) -

72 QT_BEGIN_INCLUDE_NAMESPACE -

73 # include "qstring.h" -

74 # include <execinfo.h> -

75 QT_END_INCLUDE_NAMESPACE -

76 -

77 static void print_backtrace(FILE *outb) -

78 { -

79 void *stack[128]; -

80 int stack_size = backtrace(stack, sizeof(stack) / sizeof(void *)); -

81 char **stack_symbols = backtrace_symbols(stack, stack_size); -

82 fprintf(outb, "Stack [%d]:\n", stack_size); -

if(FILE *cppfilt = popen("c++filt", "rw")) {

FILE *cppfilt ...++filt", "rw")	Description
TRUE	never evaluated
FALSE	never evaluated

84 dup2(fileno(outb), fileno(cppfilt)); -

for(int i = stack_size-1; i>=0; --i)

i>=0	Description
TRUE	never evaluated
FALSE	never evaluated

fwrite(stack_symbols[i], 1, strlen(stack_symbols[i]), cppfilt);

never executed: fwrite(stack_symbols[i], 1, strlen(stack_symbols[i]), cppfilt);

87 pclose(cppfilt); -

} else {

never executed: end of block

for(int i = stack_size-1; i>=0; --i)

i>=0	Description
TRUE	never evaluated
FALSE	never evaluated

fprintf(outb, "#%d %p [%s]\n", i, stack[i], stack_symbols[i]);

never executed: fprintf(outb, "#%d %p [%s]\n", i, stack[i], stack_symbols[i]);

}

never executed: end of block

92 } -

93 static void init_backtrace(char **, int) -

94 { -

95 } -

96 -

97 #else /* Don't use the GLIBC callback */ -

98 /* Code sourced from: */ -

99 QT_BEGIN_INCLUDE_NAMESPACE -

100 #include <stdarg.h> -

101 #include <string.h> -

102 #include <errno.h> -

103 #include <sys/types.h> -

104 #include <sys/wait.h> -

105 #if defined(Q_OS_IRIX) && defined(USE_LIBEXC) -

106 # include <libexc.h> -

107 #endif -

108 QT_END_INCLUDE_NAMESPACE -

109 -

110 -

111 static char *globalProgName = NULL; -

112 static bool backtrace_command(FILE *outb, const char *format, ...) -

113 { -

114 -

115 bool ret = false; -

116 char buffer[50]; -

117 -

118 /* -

119 * Please note that vsnprintf() is not ASync safe (ie. cannot safely -

120 * be used from a signal handler.) If this proves to be a problem -

121 * then the cmd string can be built by more basic functions such as -

122 * strcpy, strcat, and a home-made integer-to-ascii function. -

123 */ -

124 va_list args; -

125 char cmd[512]; -

126 va_start(args, format); -

127 qvsnprintf(cmd, 512, format, args); -

128 va_end(args); -

129 -

130 char *foo = cmd; -

131 #if 0 -

132 foo = "echo hi"; -

133 #endif -

134 if(FILE *inb = popen(foo, "r")) { -

135 while(!feof(inb)) { -

136 int len = fread(buffer, 1, sizeof(buffer), inb); -

137 if(!len) -

138 break; -

139 if(!ret) { -

140 fwrite("Output from ", 1, strlen("Output from "), outb); -

141 strtok(cmd, " "); -

142 fwrite(cmd, 1, strlen(cmd), outb); -

143 fwrite("\n", 1, 1, outb); -

144 ret = true; -

145 } -

146 fwrite(buffer, 1, len, outb); -

147 } -

148 fclose(inb); -

149 } -

150 return ret; -

151 } -

152 -

153 static void init_backtrace(char **argv, int argc) -

154 { -

155 if(argc >= 1) -

156 globalProgName = argv[0]; -

157 } -

158 -

159 static void print_backtrace(FILE *outb) -

160 { -

161 /* -

162 * In general dbx seems to do a better job than gdb. -

163 * -

164 * Different dbx implementations require different flags/commands. -

165 */ -

166 #if defined(Q_OS_AIX) -

167 if(backtrace_command(outb, "dbx -a %d 2>/dev/null <<EOF\n" -

168 "where\n" -

169 "detach\n" -

170 "EOF\n", -

171 (int)getpid())) -

172 return; -

173 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

174 "set prompt\n" -

175 "where\n" -

176 "detach\n" -

177 "quit\n" -

178 "EOF\n", -

179 globalProgName, (int)getpid())) -

180 return; -

181 #elif defined(Q_OS_FREEBSD) -

182 /* -

183 * FreeBSD insists on sending a SIGSTOP to the process we -

184 * attach to, so we let the debugger send a SIGCONT to that -

185 * process after we have detached. -

186 */ -

187 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

188 "set prompt\n" -

189 "where\n" -

190 "detach\n" -

191 "shell kill -CONT %d\n" -

192 "quit\n" -

193 "EOF\n", -

194 globalProgName, (int)getpid(), (int)getpid())) -

195 return; -

196 #elif defined(Q_OS_HPUX) -

197 /* -

198 * HP decided to call their debugger xdb. -

199 * -

200 * This does not seem to work properly yet. The debugger says -

201 * "Note: Stack traces may not be possible until you are -

202 * stopped in user code." on HP-UX 09.01 -

203 * -

204 * -L = line-oriented interface. -

205 * "T [depth]" gives a stacktrace with local variables. -

206 * The final "y" is confirmation to the quit command. -

207 */ -

208 if(backtrace_command(outb, "xdb -P %d -L %s 2>&1 <<EOF\n" -

209 "T 50\n" -

210 "q\ny\n" -

211 "EOF\n", -

212 (int)getpid(), globalProgName)) -

213 return; -

214 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

215 "set prompt\n" -

216 "where\n" -

217 "detach\n" -

218 "quit\n" -

219 "EOF\n", -

220 globalProgName, (int)getpid())) -

221 return; -

222 #elif defined(Q_OS_IRIX) -

223 /* -

224 * "set $page=0" drops hold mode -

225 * "dump ." displays the contents of the variables -

226 */ -

227 if(backtrace_command(outb, "dbx -p %d 2>/dev/null <<EOF\n" -

228 "set \\$page=0\n" -

229 "where\n" -

230 # if !defined(__GNUC__) -

231 /* gcc does not generate this information */ -

232 "dump .\n" -

233 # endif -

234 "detach\n" -

235 "EOF\n", -

236 (int)getpid())) -

237 return; -

238 -

239 # if defined(USE_LIBEXC) -

240 if(trace_back_stack_and_print()) -

241 return; -

242 # endif -

243 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

244 "set prompt\n" -

245 "where\n" -

246 "echo ---\\n\n" -

247 "frame 5\n" /* Skip signal handler frames */ -

248 "set \\$x = 50\n" -

249 "while (\\$x)\n" /* Print local variables for each frame */ -

250 "info locals\n" -

251 "up\n" -

252 "set \\$x--\n" -

253 "end\n" -

254 "echo ---\\n\n" -

255 "detach\n" -

256 "quit\n" -

257 "EOF\n", -

258 globalProgName, (int)getpid())) -

259 return; -

260 #elif defined(Q_OS_OSF) -

261 if(backtrace_command(outb, "dbx -pid %d %s 2>/dev/null <<EOF\n" -

262 "where\n" -

263 "detach\n" -

264 "quit\n" -

265 "EOF\n", -

266 (int)getpid(), globalProgName)) -

267 return; -

268 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

269 "set prompt\n" -

270 "where\n" -

271 "detach\n" -

272 "quit\n" -

273 "EOF\n", -

274 globalProgName, (int)getpid())) -

275 return; -

276 #elif defined(Q_OS_SCO) -

277 /* -

278 * SCO OpenServer dbx is like a catch-22. The 'detach' command -

279 * depends on whether ptrace(S) support detaching or not. If it -

280 * is supported then 'detach' must be used, otherwise the process -

281 * will be killed upon dbx exit. If it isn't supported then 'detach' -

282 * will cause the process to be killed. We do not want it to be -

283 * killed. -

284 * -

285 * Out of two evils, the omission of 'detach' was chosen because -

286 * it worked on our system. -

287 */ -

288 if(backtrace_command(outb, "dbx %s %d 2>/dev/null <<EOF\n" -

289 "where\n" -

290 "quit\nEOF\n", -

291 globalProgName, (int)getpid())) -

292 return; -

293 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

294 "set prompt\n" -

295 "where\n" -

296 "detach\n" -

297 "quit\n" -

298 "EOF\n", -

299 globalProgName, (int)getpid())) -

300 return; -

301 #elif defined(Q_OS_SOLARIS) -

302 if(backtrace_command(outb, "dbx %s %d 2>/dev/null <<EOF\n" -

303 "where\n" -

304 "detach\n" -

305 "EOF\n", -

306 globalProgName, (int)getpid())) -

307 return; -

308 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

309 "set prompt\n" -

310 "where\n" -

311 "echo ---\\n\n" -

312 "frame 5\n" /* Skip signal handler frames */ -

313 "set \\$x = 50\n" -

314 "while (\\$x)\n" /* Print local variables for each frame */ -

315 "info locals\n" -

316 "up\n" -

317 "set \\$x--\n" -

318 "end\n" -

319 "echo ---\\n\n" -

320 "detach\n" -

321 "quit\n" -

322 "EOF\n", -

323 globalProgName, (int)getpid())) -

324 return; -

325 if(backtrace_command(outb, "/usr/proc/bin/pstack %d", -

326 (int)getpid())) -

327 return; -

328 /* -

329 * Other Unices (AIX, HPUX, SCO) also have adb, but -

330 * they seem unable to attach to a running process.) -

331 */ -

332 if(backtrace_command(outb, "adb %s 2>&1 <<EOF\n" -

333 "0t%d:A\n" /* Attach to pid */ -

334 "\\$c\n" /* print stacktrace */ -

335 ":R\n" /* Detach */ -

336 "\\$q\n" /* Quit */ -

337 "EOF\n", -

338 globalProgName, (int)getpid())) -

339 return; -

340 #elif defined(Q_OS_INTEGRITY) -

341 /* abort */ -

342 CheckSuccess(Failure); -

343 #else /* All other platforms */ -

344 /* -

345 * TODO: SCO/UnixWare 7 must be something like (not tested) -

346 * debug -i c <pid> <<EOF\nstack -f 4\nquit\nEOF\n -

347 */ -

348 # if !defined(__GNUC__) -

349 if(backtrace_command(outb, "dbx %s %d 2>/dev/null <<EOF\n" -

350 "where\n" -

351 "detach\n" -

352 "EOF\n", -

353 globalProgName, (int)getpid())) -

354 return; -

355 # endif -

356 if(backtrace_command(outb, "gdb -q %s %d 2>/dev/null <<EOF\n" -

357 "set prompt\n" -

358 "where\n" -

359 #if 0 -

360 "echo ---\\n\n" -

361 "frame 4\n" -

362 "set \\$x = 50\n" -

363 "while (\\$x)\n" -

364 "info locals\n" -

365 "up\n" -

366 "set \\$x--\n" -

367 "end\n" -

368 "echo ---\\n\n" -

369 #endif -

370 "detach\n" -

371 "quit\n" -

372 "EOF\n", -

373 globalProgName, (int)getpid())) -

374 return; -

375 #endif -

376 const char debug_err[] = "No debugger found\n"; -

377 fwrite(debug_err, strlen(debug_err), 1, outb); -

378 } -

379 /* end of copied code */ -

380 #endif -

381 -

382 -

383 void qt_signal_handler(int sig) -

384 { -

385 signal(sig, SIG_DFL); -

386

if(QSegfaultHandler::callback) {

QSegfaultHandler::callback	Description
TRUE	never evaluated
FALSE	never evaluated

387 (*QSegfaultHandler::callback)(); -

388 _exit(1); -

389

}

never executed: end of block

390 FILE *outb = stderr; -

391

if(char *crash_loc = ::getenv("QT_CRASH_OUTPUT")) {

char *crash_lo...CRASH_OUTPUT")	Description
TRUE	never evaluated
FALSE	never evaluated

392

if(FILE *new_outb = fopen(crash_loc, "w")) {

FILE *new_outb...rash_loc, "w")	Description
TRUE	never evaluated
FALSE	never evaluated

393 fprintf(stderr, "Crash (backtrace written to %s)!!!\n", crash_loc); -

394 outb = new_outb; -

395

}

never executed: end of block

396

} else {

never executed: end of block

397 fprintf(outb, "Crash!!!\n"); -

398

}

never executed: end of block

399 print_backtrace(outb); -

400

if(outb != stderr)

outb != stderr	Description
TRUE	never evaluated
FALSE	never evaluated

401

fclose(outb);

never executed: fclose(outb);

402 _exit(1); -

403

}

never executed: end of block

404 -

405 -

406 void -

407 QSegfaultHandler::initialize(char **argv, int argc) -

408 { -

409 init_backtrace(argv, argc); -

410 -

411 struct sigaction SignalAction; -

412 SignalAction.sa_flags = 0; -

413 SignalAction.sa_handler = qt_signal_handler; -

414 sigemptyset(&SignalAction.sa_mask); -

415 sigaction(SIGSEGV, &SignalAction, NULL); -

416 sigaction(SIGBUS, &SignalAction, NULL); -

417

}

never executed: end of block

418 -

419 QT_END_NAMESPACE -

420 -

421 #endif // QT_NO_CRASHHANDLER -

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