git.oblomov.eu Git - wine/blob - dlls/msvcrt/except.c

   1 /*
   2  * msvcrt.dll exception handling
   3  *
   4  * Copyright 2000 Jon Griffiths
   5  * Copyright 2005 Juan Lang
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * NOTES:
  22  *
  23  * See http://www.microsoft.com/msj/0197/exception/exception.htm,
  24  * but don't believe all of it.
  25  *
  26  * FIXME: Incomplete support for nested exceptions/try block cleanup.
  27  */
  28
  29 #include "config.h"
  30 #include "wine/port.h"
  31
  32 #include <stdarg.h>
  33
  34 #include "windef.h"
  35 #include "winbase.h"
  36 #include "winternl.h"
  37 #include "wine/exception.h"
  38 #include "msvcrt.h"
  39 #include "excpt.h"
  40 #include "wincon.h"
  41 #include "msvcrt/float.h"
  42 #include "wine/debug.h"
  43
  44 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  45
  46 /* VC++ extensions to Win32 SEH */
  47 typedef struct _SCOPETABLE
  48 {
  49   int previousTryLevel;
  50   int (*lpfnFilter)(PEXCEPTION_POINTERS);
  51   int (*lpfnHandler)(void);
  52 } SCOPETABLE, *PSCOPETABLE;
  53
  54 typedef struct _MSVCRT_EXCEPTION_FRAME
  55 {
  56   EXCEPTION_REGISTRATION_RECORD *prev;
  57   void (*handler)(PEXCEPTION_RECORD, EXCEPTION_REGISTRATION_RECORD*,
  58                   PCONTEXT, PEXCEPTION_RECORD);
  59   PSCOPETABLE scopetable;
  60   int trylevel;
  61   int _ebp;
  62   PEXCEPTION_POINTERS xpointers;
  63 } MSVCRT_EXCEPTION_FRAME;
  64
  65 #define TRYLEVEL_END (-1) /* End of trylevel list */
  66
  67 #if defined(__GNUC__) && defined(__i386__)
  68 static inline void call_finally_block( void *code_block, void *base_ptr )
  69 {
  70     __asm__ __volatile__ ("movl %1,%%ebp; call *%%eax"
  71                           : : "a" (code_block), "g" (base_ptr));
  72 }
  73
  74 static inline int call_filter( int (*func)(PEXCEPTION_POINTERS), void *arg, void *ebp )
  75 {
  76     int ret;
  77     __asm__ __volatile__ ("pushl %%ebp; pushl %3; movl %2,%%ebp; call *%%eax; popl %%ebp; popl %%ebp"
  78                           : "=a" (ret)
  79                           : "0" (func), "r" (ebp), "r" (arg)
  80                           : "ecx", "edx", "memory" );
  81     return ret;
  82 }
  83
  84 static inline int call_unwind_func( int (*func)(void), void *ebp )
  85 {
  86     int ret;
  87     __asm__ __volatile__ ("pushl %%ebp; movl %2,%%ebp; call *%0; popl %%ebp"
  88                           : "=a" (ret)
  89                           : "0" (func), "r" (ebp)
  90                           : "ecx", "edx", "memory" );
  91     return ret;
  92 }
  93
  94 #endif
  95
  96 static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec,
  97                                    EXCEPTION_REGISTRATION_RECORD* frame,
  98                                    PCONTEXT context,
  99                                    EXCEPTION_REGISTRATION_RECORD** dispatch)
 100 {
 101   if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
 102     return ExceptionContinueSearch;
 103   *dispatch = frame;
 104   return ExceptionCollidedUnwind;
 105 }
 106
 107
 108 /*********************************************************************
 109  *              _EH_prolog (MSVCRT.@)
 110  */
 111 #ifdef __i386__
 112 /* Provided for VC++ binary compatibility only */
 113 __ASM_GLOBAL_FUNC(_EH_prolog,
 114                   "pushl $-1\n\t"
 115                   "pushl %eax\n\t"
 116                   "pushl %fs:0\n\t"
 117                   "movl  %esp, %fs:0\n\t"
 118                   "movl  12(%esp), %eax\n\t"
 119                   "movl  %ebp, 12(%esp)\n\t"
 120                   "leal  12(%esp), %ebp\n\t"
 121                   "pushl %eax\n\t"
 122                   "ret")
 123
 124 static void msvcrt_local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp)
 125 {
 126   EXCEPTION_REGISTRATION_RECORD reg;
 127
 128   TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel);
 129
 130   /* Register a handler in case of a nested exception */
 131   reg.Handler = MSVCRT_nested_handler;
 132   reg.Prev = NtCurrentTeb()->Tib.ExceptionList;
 133   __wine_push_frame(&reg);
 134
 135   while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel)
 136   {
 137       int level = frame->trylevel;
 138       frame->trylevel = frame->scopetable[level].previousTryLevel;
 139       if (!frame->scopetable[level].lpfnFilter)
 140       {
 141           TRACE( "__try block cleanup level %d handler %p ebp %p\n",
 142                  level, frame->scopetable[level].lpfnHandler, ebp );
 143           call_unwind_func( frame->scopetable[level].lpfnHandler, ebp );
 144       }
 145   }
 146   __wine_pop_frame(&reg);
 147   TRACE("unwound OK\n");
 148 }
 149
 150 /*******************************************************************
 151  *              _local_unwind2 (MSVCRT.@)
 152  */
 153 void CDECL _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel)
 154 {
 155     msvcrt_local_unwind2( frame, trylevel, &frame->_ebp );
 156 }
 157
 158 #endif  /* __i386__ */
 159
 160 /*******************************************************************
 161  *              _global_unwind2 (MSVCRT.@)
 162  */
 163 void CDECL _global_unwind2(EXCEPTION_REGISTRATION_RECORD* frame)
 164 {
 165     TRACE("(%p)\n",frame);
 166     RtlUnwind( frame, 0, 0, 0 );
 167 }
 168
 169 /*********************************************************************
 170  *              _except_handler2 (MSVCRT.@)
 171  */
 172 int CDECL _except_handler2(PEXCEPTION_RECORD rec,
 173                            EXCEPTION_REGISTRATION_RECORD* frame,
 174                            PCONTEXT context,
 175                            EXCEPTION_REGISTRATION_RECORD** dispatcher)
 176 {
 177   FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n",
 178         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 179         frame->Handler, context, dispatcher);
 180   return ExceptionContinueSearch;
 181 }
 182
 183 /*********************************************************************
 184  *              _except_handler3 (MSVCRT.@)
 185  */
 186 int CDECL _except_handler3(PEXCEPTION_RECORD rec,
 187                            MSVCRT_EXCEPTION_FRAME* frame,
 188                            PCONTEXT context, void* dispatcher)
 189 {
 190 #if defined(__GNUC__) && defined(__i386__)
 191   int retval, trylevel;
 192   EXCEPTION_POINTERS exceptPtrs;
 193   PSCOPETABLE pScopeTable;
 194
 195   TRACE("exception %x flags=%x at %p handler=%p %p %p semi-stub\n",
 196         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 197         frame->handler, context, dispatcher);
 198
 199   __asm__ __volatile__ ("cld");
 200
 201   if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
 202   {
 203     /* Unwinding the current frame */
 204     msvcrt_local_unwind2(frame, TRYLEVEL_END, &frame->_ebp);
 205     TRACE("unwound current frame, returning ExceptionContinueSearch\n");
 206     return ExceptionContinueSearch;
 207   }
 208   else
 209   {
 210     /* Hunting for handler */
 211     exceptPtrs.ExceptionRecord = rec;
 212     exceptPtrs.ContextRecord = context;
 213     *((DWORD *)frame-1) = (DWORD)&exceptPtrs;
 214     trylevel = frame->trylevel;
 215     pScopeTable = frame->scopetable;
 216
 217     while (trylevel != TRYLEVEL_END)
 218     {
 219       if (pScopeTable[trylevel].lpfnFilter)
 220       {
 221         TRACE("filter = %p\n", pScopeTable[trylevel].lpfnFilter);
 222
 223         retval = call_filter( pScopeTable[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp );
 224
 225         TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ?
 226               "CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ?
 227               "EXECUTE_HANDLER" : "CONTINUE_SEARCH");
 228
 229         if (retval == EXCEPTION_CONTINUE_EXECUTION)
 230           return ExceptionContinueExecution;
 231
 232         if (retval == EXCEPTION_EXECUTE_HANDLER)
 233         {
 234           /* Unwind all higher frames, this one will handle the exception */
 235           _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame);
 236           msvcrt_local_unwind2(frame, trylevel, &frame->_ebp);
 237
 238           /* Set our trylevel to the enclosing block, and call the __finally
 239            * code, which won't return
 240            */
 241           frame->trylevel = pScopeTable->previousTryLevel;
 242           TRACE("__finally block %p\n",pScopeTable[trylevel].lpfnHandler);
 243           call_finally_block(pScopeTable[trylevel].lpfnHandler, &frame->_ebp);
 244           ERR("Returned from __finally block - expect crash!\n");
 245        }
 246       }
 247       trylevel = pScopeTable->previousTryLevel;
 248     }
 249   }
 250 #else
 251   FIXME("exception %lx flags=%lx at %p handler=%p %p %p stub\n",
 252         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 253         frame->handler, context, dispatcher);
 254 #endif
 255   TRACE("reached TRYLEVEL_END, returning ExceptionContinueSearch\n");
 256   return ExceptionContinueSearch;
 257 }
 258
 259 /*********************************************************************
 260  *              _abnormal_termination (MSVCRT.@)
 261  */
 262 int CDECL _abnormal_termination(void)
 263 {
 264   FIXME("(void)stub\n");
 265   return 0;
 266 }
 267
 268 /*
 269  * setjmp/longjmp implementation
 270  */
 271
 272 #ifdef __i386__
 273 #define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */
 274 typedef void (__stdcall *MSVCRT_unwind_function)(const struct MSVCRT___JUMP_BUFFER *);
 275
 276 /* define an entrypoint for setjmp/setjmp3 that stores the registers in the jmp buf */
 277 /* and then jumps to the C backend function */
 278 #define DEFINE_SETJMP_ENTRYPOINT(name) \
 279     __ASM_GLOBAL_FUNC( name, \
 280                        "movl 4(%esp),%ecx\n\t"   /* jmp_buf */      \
 281                        "movl %ebp,0(%ecx)\n\t"   /* jmp_buf.Ebp */  \
 282                        "movl %ebx,4(%ecx)\n\t"   /* jmp_buf.Ebx */  \
 283                        "movl %edi,8(%ecx)\n\t"   /* jmp_buf.Edi */  \
 284                        "movl %esi,12(%ecx)\n\t"  /* jmp_buf.Esi */  \
 285                        "movl %esp,16(%ecx)\n\t"  /* jmp_buf.Esp */  \
 286                        "movl 0(%esp),%eax\n\t"                      \
 287                        "movl %eax,20(%ecx)\n\t"  /* jmp_buf.Eip */  \
 288                        "jmp " __ASM_NAME("__regs_") # name )
 289
 290 /* restore the registers from the jmp buf upon longjmp */
 291 extern void DECLSPEC_NORETURN longjmp_set_regs( struct MSVCRT___JUMP_BUFFER *jmp, int retval );
 292 __ASM_GLOBAL_FUNC( longjmp_set_regs,
 293                    "movl 4(%esp),%ecx\n\t"   /* jmp_buf */
 294                    "movl 8(%esp),%eax\n\t"   /* retval */
 295                    "movl 0(%ecx),%ebp\n\t"   /* jmp_buf.Ebp */
 296                    "movl 4(%ecx),%ebx\n\t"   /* jmp_buf.Ebx */
 297                    "movl 8(%ecx),%edi\n\t"   /* jmp_buf.Edi */
 298                    "movl 12(%ecx),%esi\n\t"  /* jmp_buf.Esi */
 299                    "movl 16(%ecx),%esp\n\t"  /* jmp_buf.Esp */
 300                    "addl $4,%esp\n\t"        /* get rid of return address */
 301                    "jmp *20(%ecx)\n\t"       /* jmp_buf.Eip */ )
 302
 303 /*
 304  * The signatures of the setjmp/longjmp functions do not match that
 305  * declared in the setjmp header so they don't follow the regular naming
 306  * convention to avoid conflicts.
 307  */
 308
 309 /*******************************************************************
 310  *              _setjmp (MSVCRT.@)
 311  */
 312 DEFINE_SETJMP_ENTRYPOINT(MSVCRT__setjmp)
 313 int CDECL __regs_MSVCRT__setjmp(struct MSVCRT___JUMP_BUFFER *jmp)
 314 {
 315     jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 316     if (jmp->Registration == ~0UL)
 317         jmp->TryLevel = TRYLEVEL_END;
 318     else
 319         jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
 320
 321     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
 322           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
 323     return 0;
 324 }
 325
 326 /*******************************************************************
 327  *              _setjmp3 (MSVCRT.@)
 328  */
 329 DEFINE_SETJMP_ENTRYPOINT( MSVCRT__setjmp3 )
 330 int CDECL __regs_MSVCRT__setjmp3(struct MSVCRT___JUMP_BUFFER *jmp, int nb_args, ...)
 331 {
 332     jmp->Cookie = MSVCRT_JMP_MAGIC;
 333     jmp->UnwindFunc = 0;
 334     jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 335     if (jmp->Registration == ~0UL)
 336     {
 337         jmp->TryLevel = TRYLEVEL_END;
 338     }
 339     else
 340     {
 341         int i;
 342         va_list args;
 343
 344         va_start( args, nb_args );
 345         if (nb_args > 0) jmp->UnwindFunc = va_arg( args, unsigned long );
 346         if (nb_args > 1) jmp->TryLevel = va_arg( args, unsigned long );
 347         else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
 348         for (i = 0; i < 6 && i < nb_args - 2; i++)
 349             jmp->UnwindData[i] = va_arg( args, unsigned long );
 350         va_end( args );
 351     }
 352
 353     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
 354           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
 355     return 0;
 356 }
 357
 358 /*********************************************************************
 359  *              longjmp (MSVCRT.@)
 360  */
 361 int CDECL MSVCRT_longjmp(struct MSVCRT___JUMP_BUFFER *jmp, int retval)
 362 {
 363     unsigned long cur_frame = 0;
 364
 365     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx retval=%08x\n",
 366           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration, retval );
 367
 368     cur_frame=(unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 369     TRACE("cur_frame=%lx\n",cur_frame);
 370
 371     if (cur_frame != jmp->Registration)
 372         _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)jmp->Registration);
 373
 374     if (jmp->Registration)
 375     {
 376         if (!IsBadReadPtr(&jmp->Cookie, sizeof(long)) &&
 377             jmp->Cookie == MSVCRT_JMP_MAGIC && jmp->UnwindFunc)
 378         {
 379             MSVCRT_unwind_function unwind_func;
 380
 381             unwind_func=(MSVCRT_unwind_function)jmp->UnwindFunc;
 382             unwind_func(jmp);
 383         }
 384         else
 385             msvcrt_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration,
 386                                  jmp->TryLevel, (void *)jmp->Ebp);
 387     }
 388
 389     if (!retval)
 390         retval = 1;
 391
 392     longjmp_set_regs( jmp, retval );
 393 }
 394
 395 /*********************************************************************
 396  *              _seh_longjmp_unwind (MSVCRT.@)
 397  */
 398 void __stdcall _seh_longjmp_unwind(struct MSVCRT___JUMP_BUFFER *jmp)
 399 {
 400     msvcrt_local_unwind2( (MSVCRT_EXCEPTION_FRAME *)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp );
 401 }
 402 #endif /* i386 */
 403
 404 static MSVCRT___sighandler_t sighandlers[MSVCRT_NSIG] = { MSVCRT_SIG_DFL };
 405
 406 static BOOL WINAPI msvcrt_console_handler(DWORD ctrlType)
 407 {
 408     BOOL ret = FALSE;
 409
 410     switch (ctrlType)
 411     {
 412     case CTRL_C_EVENT:
 413         if (sighandlers[MSVCRT_SIGINT])
 414         {
 415             if (sighandlers[MSVCRT_SIGINT] != MSVCRT_SIG_IGN)
 416                 sighandlers[MSVCRT_SIGINT](MSVCRT_SIGINT);
 417             ret = TRUE;
 418         }
 419         break;
 420     }
 421     return ret;
 422 }
 423
 424 typedef void (*float_handler)(int, int);
 425
 426 /* The exception codes are actually NTSTATUS values */
 427 static const struct
 428 {
 429     NTSTATUS status;
 430     int signal;
 431 } float_exception_map[] = {
 432  { EXCEPTION_FLT_DENORMAL_OPERAND, _FPE_DENORMAL },
 433  { EXCEPTION_FLT_DIVIDE_BY_ZERO, _FPE_ZERODIVIDE },
 434  { EXCEPTION_FLT_INEXACT_RESULT, _FPE_INEXACT },
 435  { EXCEPTION_FLT_INVALID_OPERATION, _FPE_INVALID },
 436  { EXCEPTION_FLT_OVERFLOW, _FPE_OVERFLOW },
 437  { EXCEPTION_FLT_STACK_CHECK, _FPE_STACKOVERFLOW },
 438  { EXCEPTION_FLT_UNDERFLOW, _FPE_UNDERFLOW },
 439 };
 440
 441 static LONG WINAPI msvcrt_exception_filter(struct _EXCEPTION_POINTERS *except)
 442 {
 443     LONG ret = EXCEPTION_CONTINUE_SEARCH;
 444     MSVCRT___sighandler_t handler;
 445
 446     if (!except || !except->ExceptionRecord)
 447         return EXCEPTION_CONTINUE_SEARCH;
 448
 449     switch (except->ExceptionRecord->ExceptionCode)
 450     {
 451     case EXCEPTION_ACCESS_VIOLATION:
 452         if ((handler = sighandlers[MSVCRT_SIGSEGV]) != MSVCRT_SIG_DFL)
 453         {
 454             if (handler != MSVCRT_SIG_IGN)
 455             {
 456                 sighandlers[MSVCRT_SIGSEGV] = MSVCRT_SIG_DFL;
 457                 handler(MSVCRT_SIGSEGV);
 458             }
 459             ret = EXCEPTION_CONTINUE_EXECUTION;
 460         }
 461         break;
 462     /* According to
 463      * http://msdn.microsoft.com/library/en-us/vclib/html/_CRT_signal.asp
 464      * the FPE signal handler takes as a second argument the type of
 465      * floating point exception.
 466      */
 467     case EXCEPTION_FLT_DENORMAL_OPERAND:
 468     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
 469     case EXCEPTION_FLT_INEXACT_RESULT:
 470     case EXCEPTION_FLT_INVALID_OPERATION:
 471     case EXCEPTION_FLT_OVERFLOW:
 472     case EXCEPTION_FLT_STACK_CHECK:
 473     case EXCEPTION_FLT_UNDERFLOW:
 474         if ((handler = sighandlers[MSVCRT_SIGFPE]) != MSVCRT_SIG_DFL)
 475         {
 476             if (handler != MSVCRT_SIG_IGN)
 477             {
 478                 int i, float_signal = _FPE_INVALID;
 479
 480                 sighandlers[MSVCRT_SIGFPE] = MSVCRT_SIG_DFL;
 481                 for (i = 0; i < sizeof(float_exception_map) /
 482                          sizeof(float_exception_map[0]); i++)
 483                 {
 484                     if (float_exception_map[i].status ==
 485                         except->ExceptionRecord->ExceptionCode)
 486                     {
 487                         float_signal = float_exception_map[i].signal;
 488                         break;
 489                     }
 490                 }
 491                 ((float_handler)handler)(MSVCRT_SIGFPE, float_signal);
 492             }
 493             ret = EXCEPTION_CONTINUE_EXECUTION;
 494         }
 495         break;
 496     case EXCEPTION_ILLEGAL_INSTRUCTION:
 497         if ((handler = sighandlers[MSVCRT_SIGILL]) != MSVCRT_SIG_DFL)
 498         {
 499             if (handler != MSVCRT_SIG_IGN)
 500             {
 501                 sighandlers[MSVCRT_SIGILL] = MSVCRT_SIG_DFL;
 502                 handler(MSVCRT_SIGILL);
 503             }
 504             ret = EXCEPTION_CONTINUE_EXECUTION;
 505         }
 506         break;
 507     }
 508     return ret;
 509 }
 510
 511 void msvcrt_init_signals(void)
 512 {
 513     SetConsoleCtrlHandler(msvcrt_console_handler, TRUE);
 514     SetUnhandledExceptionFilter(msvcrt_exception_filter);
 515 }
 516
 517 void msvcrt_free_signals(void)
 518 {
 519     SetConsoleCtrlHandler(msvcrt_console_handler, FALSE);
 520     SetUnhandledExceptionFilter(NULL);
 521 }
 522
 523 /*********************************************************************
 524  *              signal (MSVCRT.@)
 525  * MS signal handling is described here:
 526  * http://msdn.microsoft.com/library/en-us/vclib/html/_CRT_signal.asp
 527  * Some signals may never be generated except through an explicit call to
 528  * raise.
 529  */
 530 MSVCRT___sighandler_t CDECL MSVCRT_signal(int sig, MSVCRT___sighandler_t func)
 531 {
 532     MSVCRT___sighandler_t ret = MSVCRT_SIG_ERR;
 533
 534     TRACE("(%d, %p)\n", sig, func);
 535
 536     if (func == MSVCRT_SIG_ERR) return MSVCRT_SIG_ERR;
 537
 538     switch (sig)
 539     {
 540     /* Cases handled internally.  Note SIGTERM is never generated by Windows,
 541      * so we effectively mask it.
 542      */
 543     case MSVCRT_SIGABRT:
 544     case MSVCRT_SIGFPE:
 545     case MSVCRT_SIGILL:
 546     case MSVCRT_SIGSEGV:
 547     case MSVCRT_SIGINT:
 548     case MSVCRT_SIGTERM:
 549         ret = sighandlers[sig];
 550         sighandlers[sig] = func;
 551         break;
 552     default:
 553         ret = MSVCRT_SIG_ERR;
 554     }
 555     return ret;
 556 }
 557
 558 /*********************************************************************
 559  *              raise (MSVCRT.@)
 560  */
 561 int CDECL MSVCRT_raise(int sig)
 562 {
 563     MSVCRT___sighandler_t handler;
 564
 565     TRACE("(%d)\n", sig);
 566
 567     switch (sig)
 568     {
 569     case MSVCRT_SIGABRT:
 570     case MSVCRT_SIGFPE:
 571     case MSVCRT_SIGILL:
 572     case MSVCRT_SIGSEGV:
 573     case MSVCRT_SIGINT:
 574     case MSVCRT_SIGTERM:
 575         handler = sighandlers[sig];
 576         if (handler == MSVCRT_SIG_DFL) MSVCRT__exit(3);
 577         if (handler != MSVCRT_SIG_IGN)
 578         {
 579             sighandlers[sig] = MSVCRT_SIG_DFL;
 580             if (sig == MSVCRT_SIGFPE)
 581                 ((float_handler)handler)(sig, _FPE_EXPLICITGEN);
 582             else
 583                 handler(sig);
 584         }
 585         break;
 586     default:
 587         return -1;
 588     }
 589     return 0;
 590 }
 591
 592 /*********************************************************************
 593  *              _XcptFilter (MSVCRT.@)
 594  */
 595 int CDECL _XcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
 596 {
 597     TRACE("(%08x,%p)\n", ex, ptr);
 598     /* I assume ptr->ExceptionRecord->ExceptionCode is the same as ex */
 599     return msvcrt_exception_filter(ptr);
 600 }