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  * FIXME: Incomplete support for nested exceptions/try block cleanup.
  22  */
  23
  24 #include "config.h"
  25 #include "wine/port.h"
  26
  27 #include <stdarg.h>
  28
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winternl.h"
  32 #include "wine/exception.h"
  33 #include "msvcrt.h"
  34 #include "excpt.h"
  35 #include "wincon.h"
  36 #include "msvcrt/float.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  40
  41 /* VC++ extensions to Win32 SEH */
  42 typedef struct _SCOPETABLE
  43 {
  44   int previousTryLevel;
  45   int (*lpfnFilter)(PEXCEPTION_POINTERS);
  46   int (*lpfnHandler)(void);
  47 } SCOPETABLE, *PSCOPETABLE;
  48
  49 typedef struct _MSVCRT_EXCEPTION_FRAME
  50 {
  51   EXCEPTION_REGISTRATION_RECORD *prev;
  52   void (*handler)(PEXCEPTION_RECORD, EXCEPTION_REGISTRATION_RECORD*,
  53                   PCONTEXT, PEXCEPTION_RECORD);
  54   PSCOPETABLE scopetable;
  55   int trylevel;
  56   int _ebp;
  57   PEXCEPTION_POINTERS xpointers;
  58 } MSVCRT_EXCEPTION_FRAME;
  59
  60 #define TRYLEVEL_END (-1) /* End of trylevel list */
  61
  62 #if defined(__GNUC__) && defined(__i386__)
  63 static inline void call_finally_block( void *code_block, void *base_ptr )
  64 {
  65     __asm__ __volatile__ ("movl %1,%%ebp; call *%%eax"
  66                           : : "a" (code_block), "g" (base_ptr));
  67 }
  68
  69 static inline int call_filter( int (*func)(PEXCEPTION_POINTERS), void *arg, void *ebp )
  70 {
  71     int ret;
  72     __asm__ __volatile__ ("pushl %%ebp; pushl %3; movl %2,%%ebp; call *%%eax; popl %%ebp; popl %%ebp"
  73                           : "=a" (ret)
  74                           : "0" (func), "r" (ebp), "r" (arg)
  75                           : "ecx", "edx", "memory" );
  76     return ret;
  77 }
  78
  79 static inline int call_unwind_func( int (*func)(void), void *ebp )
  80 {
  81     int ret;
  82     __asm__ __volatile__ ("pushl %%ebp\n\t"
  83                           "pushl %%ebx\n\t"
  84                           "pushl %%esi\n\t"
  85                           "pushl %%edi\n\t"
  86                           "movl %2,%%ebp\n\t"
  87                           "call *%0\n\t"
  88                           "popl %%edi\n\t"
  89                           "popl %%esi\n\t"
  90                           "popl %%ebx\n\t"
  91                           "popl %%ebp"
  92                           : "=a" (ret)
  93                           : "0" (func), "r" (ebp)
  94                           : "ecx", "edx", "memory" );
  95     return ret;
  96 }
  97
  98 #endif
  99
 100 static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec,
 101                                    EXCEPTION_REGISTRATION_RECORD* frame,
 102                                    PCONTEXT context,
 103                                    EXCEPTION_REGISTRATION_RECORD** dispatch)
 104 {
 105   if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
 106     return ExceptionContinueSearch;
 107   *dispatch = frame;
 108   return ExceptionCollidedUnwind;
 109 }
 110
 111
 112 /*********************************************************************
 113  *              _EH_prolog (MSVCRT.@)
 114  */
 115 #ifdef __i386__
 116 /* Provided for VC++ binary compatibility only */
 117 __ASM_GLOBAL_FUNC(_EH_prolog,
 118                   "pushl $-1\n\t"
 119                   "pushl %eax\n\t"
 120                   "pushl %fs:0\n\t"
 121                   "movl  %esp, %fs:0\n\t"
 122                   "movl  12(%esp), %eax\n\t"
 123                   "movl  %ebp, 12(%esp)\n\t"
 124                   "leal  12(%esp), %ebp\n\t"
 125                   "pushl %eax\n\t"
 126                   "ret")
 127
 128 static void msvcrt_local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp)
 129 {
 130   EXCEPTION_REGISTRATION_RECORD reg;
 131
 132   TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel);
 133
 134   /* Register a handler in case of a nested exception */
 135   reg.Handler = MSVCRT_nested_handler;
 136   reg.Prev = NtCurrentTeb()->Tib.ExceptionList;
 137   __wine_push_frame(&reg);
 138
 139   while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel)
 140   {
 141       int level = frame->trylevel;
 142       frame->trylevel = frame->scopetable[level].previousTryLevel;
 143       if (!frame->scopetable[level].lpfnFilter)
 144       {
 145           TRACE( "__try block cleanup level %d handler %p ebp %p\n",
 146                  level, frame->scopetable[level].lpfnHandler, ebp );
 147           call_unwind_func( frame->scopetable[level].lpfnHandler, ebp );
 148       }
 149   }
 150   __wine_pop_frame(&reg);
 151   TRACE("unwound OK\n");
 152 }
 153
 154 /*******************************************************************
 155  *              _local_unwind2 (MSVCRT.@)
 156  */
 157 void CDECL _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel)
 158 {
 159     msvcrt_local_unwind2( frame, trylevel, &frame->_ebp );
 160 }
 161
 162 #endif  /* __i386__ */
 163
 164 /*******************************************************************
 165  *              _global_unwind2 (MSVCRT.@)
 166  */
 167 void CDECL _global_unwind2(EXCEPTION_REGISTRATION_RECORD* frame)
 168 {
 169     TRACE("(%p)\n",frame);
 170     RtlUnwind( frame, 0, 0, 0 );
 171 }
 172
 173 /*********************************************************************
 174  *              _except_handler2 (MSVCRT.@)
 175  */
 176 int CDECL _except_handler2(PEXCEPTION_RECORD rec,
 177                            EXCEPTION_REGISTRATION_RECORD* frame,
 178                            PCONTEXT context,
 179                            EXCEPTION_REGISTRATION_RECORD** dispatcher)
 180 {
 181   FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n",
 182         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 183         frame->Handler, context, dispatcher);
 184   return ExceptionContinueSearch;
 185 }
 186
 187 /*********************************************************************
 188  *              _except_handler3 (MSVCRT.@)
 189  */
 190 int CDECL _except_handler3(PEXCEPTION_RECORD rec,
 191                            MSVCRT_EXCEPTION_FRAME* frame,
 192                            PCONTEXT context, void* dispatcher)
 193 {
 194 #if defined(__GNUC__) && defined(__i386__)
 195   int retval, trylevel;
 196   EXCEPTION_POINTERS exceptPtrs;
 197   PSCOPETABLE pScopeTable;
 198
 199   TRACE("exception %x flags=%x at %p handler=%p %p %p semi-stub\n",
 200         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 201         frame->handler, context, dispatcher);
 202
 203   __asm__ __volatile__ ("cld");
 204
 205   if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
 206   {
 207     /* Unwinding the current frame */
 208     msvcrt_local_unwind2(frame, TRYLEVEL_END, &frame->_ebp);
 209     TRACE("unwound current frame, returning ExceptionContinueSearch\n");
 210     return ExceptionContinueSearch;
 211   }
 212   else
 213   {
 214     /* Hunting for handler */
 215     exceptPtrs.ExceptionRecord = rec;
 216     exceptPtrs.ContextRecord = context;
 217     *((DWORD *)frame-1) = (DWORD)&exceptPtrs;
 218     trylevel = frame->trylevel;
 219     pScopeTable = frame->scopetable;
 220
 221     while (trylevel != TRYLEVEL_END)
 222     {
 223       if (pScopeTable[trylevel].lpfnFilter)
 224       {
 225         TRACE("filter = %p\n", pScopeTable[trylevel].lpfnFilter);
 226
 227         retval = call_filter( pScopeTable[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp );
 228
 229         TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ?
 230               "CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ?
 231               "EXECUTE_HANDLER" : "CONTINUE_SEARCH");
 232
 233         if (retval == EXCEPTION_CONTINUE_EXECUTION)
 234           return ExceptionContinueExecution;
 235
 236         if (retval == EXCEPTION_EXECUTE_HANDLER)
 237         {
 238           /* Unwind all higher frames, this one will handle the exception */
 239           _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame);
 240           msvcrt_local_unwind2(frame, trylevel, &frame->_ebp);
 241
 242           /* Set our trylevel to the enclosing block, and call the __finally
 243            * code, which won't return
 244            */
 245           frame->trylevel = pScopeTable->previousTryLevel;
 246           TRACE("__finally block %p\n",pScopeTable[trylevel].lpfnHandler);
 247           call_finally_block(pScopeTable[trylevel].lpfnHandler, &frame->_ebp);
 248           ERR("Returned from __finally block - expect crash!\n");
 249        }
 250       }
 251       trylevel = pScopeTable->previousTryLevel;
 252     }
 253   }
 254 #else
 255   FIXME("exception %lx flags=%lx at %p handler=%p %p %p stub\n",
 256         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 257         frame->handler, context, dispatcher);
 258 #endif
 259   TRACE("reached TRYLEVEL_END, returning ExceptionContinueSearch\n");
 260   return ExceptionContinueSearch;
 261 }
 262
 263 /*********************************************************************
 264  *              _abnormal_termination (MSVCRT.@)
 265  */
 266 int CDECL _abnormal_termination(void)
 267 {
 268   FIXME("(void)stub\n");
 269   return 0;
 270 }
 271
 272 /*
 273  * setjmp/longjmp implementation
 274  */
 275
 276 #ifdef __i386__
 277 #define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */
 278 typedef void (__stdcall *MSVCRT_unwind_function)(const struct MSVCRT___JUMP_BUFFER *);
 279
 280 /* define an entrypoint for setjmp/setjmp3 that stores the registers in the jmp buf */
 281 /* and then jumps to the C backend function */
 282 #define DEFINE_SETJMP_ENTRYPOINT(name) \
 283     __ASM_GLOBAL_FUNC( name, \
 284                        "movl 4(%esp),%ecx\n\t"   /* jmp_buf */      \
 285                        "movl %ebp,0(%ecx)\n\t"   /* jmp_buf.Ebp */  \
 286                        "movl %ebx,4(%ecx)\n\t"   /* jmp_buf.Ebx */  \
 287                        "movl %edi,8(%ecx)\n\t"   /* jmp_buf.Edi */  \
 288                        "movl %esi,12(%ecx)\n\t"  /* jmp_buf.Esi */  \
 289                        "movl %esp,16(%ecx)\n\t"  /* jmp_buf.Esp */  \
 290                        "movl 0(%esp),%eax\n\t"                      \
 291                        "movl %eax,20(%ecx)\n\t"  /* jmp_buf.Eip */  \
 292                        "jmp " __ASM_NAME("__regs_") # name )
 293
 294 /* restore the registers from the jmp buf upon longjmp */
 295 extern void DECLSPEC_NORETURN longjmp_set_regs( struct MSVCRT___JUMP_BUFFER *jmp, int retval );
 296 __ASM_GLOBAL_FUNC( longjmp_set_regs,
 297                    "movl 4(%esp),%ecx\n\t"   /* jmp_buf */
 298                    "movl 8(%esp),%eax\n\t"   /* retval */
 299                    "movl 0(%ecx),%ebp\n\t"   /* jmp_buf.Ebp */
 300                    "movl 4(%ecx),%ebx\n\t"   /* jmp_buf.Ebx */
 301                    "movl 8(%ecx),%edi\n\t"   /* jmp_buf.Edi */
 302                    "movl 12(%ecx),%esi\n\t"  /* jmp_buf.Esi */
 303                    "movl 16(%ecx),%esp\n\t"  /* jmp_buf.Esp */
 304                    "addl $4,%esp\n\t"        /* get rid of return address */
 305                    "jmp *20(%ecx)\n\t"       /* jmp_buf.Eip */ )
 306
 307 /*
 308  * The signatures of the setjmp/longjmp functions do not match that
 309  * declared in the setjmp header so they don't follow the regular naming
 310  * convention to avoid conflicts.
 311  */
 312
 313 /*******************************************************************
 314  *              _setjmp (MSVCRT.@)
 315  */
 316 DEFINE_SETJMP_ENTRYPOINT(MSVCRT__setjmp)
 317 int CDECL __regs_MSVCRT__setjmp(struct MSVCRT___JUMP_BUFFER *jmp)
 318 {
 319     jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 320     if (jmp->Registration == ~0UL)
 321         jmp->TryLevel = TRYLEVEL_END;
 322     else
 323         jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
 324
 325     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
 326           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
 327     return 0;
 328 }
 329
 330 /*******************************************************************
 331  *              _setjmp3 (MSVCRT.@)
 332  */
 333 DEFINE_SETJMP_ENTRYPOINT( MSVCRT__setjmp3 )
 334 int CDECL __regs_MSVCRT__setjmp3(struct MSVCRT___JUMP_BUFFER *jmp, int nb_args, ...)
 335 {
 336     jmp->Cookie = MSVCRT_JMP_MAGIC;
 337     jmp->UnwindFunc = 0;
 338     jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 339     if (jmp->Registration == ~0UL)
 340     {
 341         jmp->TryLevel = TRYLEVEL_END;
 342     }
 343     else
 344     {
 345         int i;
 346         va_list args;
 347
 348         va_start( args, nb_args );
 349         if (nb_args > 0) jmp->UnwindFunc = va_arg( args, unsigned long );
 350         if (nb_args > 1) jmp->TryLevel = va_arg( args, unsigned long );
 351         else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
 352         for (i = 0; i < 6 && i < nb_args - 2; i++)
 353             jmp->UnwindData[i] = va_arg( args, unsigned long );
 354         va_end( args );
 355     }
 356
 357     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
 358           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
 359     return 0;
 360 }
 361
 362 /*********************************************************************
 363  *              longjmp (MSVCRT.@)
 364  */
 365 int CDECL MSVCRT_longjmp(struct MSVCRT___JUMP_BUFFER *jmp, int retval)
 366 {
 367     unsigned long cur_frame = 0;
 368
 369     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx retval=%08x\n",
 370           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration, retval );
 371
 372     cur_frame=(unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 373     TRACE("cur_frame=%lx\n",cur_frame);
 374
 375     if (cur_frame != jmp->Registration)
 376         _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)jmp->Registration);
 377
 378     if (jmp->Registration)
 379     {
 380         if (!IsBadReadPtr(&jmp->Cookie, sizeof(long)) &&
 381             jmp->Cookie == MSVCRT_JMP_MAGIC && jmp->UnwindFunc)
 382         {
 383             MSVCRT_unwind_function unwind_func;
 384
 385             unwind_func=(MSVCRT_unwind_function)jmp->UnwindFunc;
 386             unwind_func(jmp);
 387         }
 388         else
 389             msvcrt_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration,
 390                                  jmp->TryLevel, (void *)jmp->Ebp);
 391     }
 392
 393     if (!retval)
 394         retval = 1;
 395
 396     longjmp_set_regs( jmp, retval );
 397 }
 398
 399 /*********************************************************************
 400  *              _seh_longjmp_unwind (MSVCRT.@)
 401  */
 402 void __stdcall _seh_longjmp_unwind(struct MSVCRT___JUMP_BUFFER *jmp)
 403 {
 404     msvcrt_local_unwind2( (MSVCRT_EXCEPTION_FRAME *)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp );
 405 }
 406 #endif /* i386 */
 407
 408 static MSVCRT___sighandler_t sighandlers[MSVCRT_NSIG] = { MSVCRT_SIG_DFL };
 409
 410 static BOOL WINAPI msvcrt_console_handler(DWORD ctrlType)
 411 {
 412     BOOL ret = FALSE;
 413
 414     switch (ctrlType)
 415     {
 416     case CTRL_C_EVENT:
 417         if (sighandlers[MSVCRT_SIGINT])
 418         {
 419             if (sighandlers[MSVCRT_SIGINT] != MSVCRT_SIG_IGN)
 420                 sighandlers[MSVCRT_SIGINT](MSVCRT_SIGINT);
 421             ret = TRUE;
 422         }
 423         break;
 424     }
 425     return ret;
 426 }
 427
 428 typedef void (*float_handler)(int, int);
 429
 430 /* The exception codes are actually NTSTATUS values */
 431 static const struct
 432 {
 433     NTSTATUS status;
 434     int signal;
 435 } float_exception_map[] = {
 436  { EXCEPTION_FLT_DENORMAL_OPERAND, _FPE_DENORMAL },
 437  { EXCEPTION_FLT_DIVIDE_BY_ZERO, _FPE_ZERODIVIDE },
 438  { EXCEPTION_FLT_INEXACT_RESULT, _FPE_INEXACT },
 439  { EXCEPTION_FLT_INVALID_OPERATION, _FPE_INVALID },
 440  { EXCEPTION_FLT_OVERFLOW, _FPE_OVERFLOW },
 441  { EXCEPTION_FLT_STACK_CHECK, _FPE_STACKOVERFLOW },
 442  { EXCEPTION_FLT_UNDERFLOW, _FPE_UNDERFLOW },
 443 };
 444
 445 static LONG WINAPI msvcrt_exception_filter(struct _EXCEPTION_POINTERS *except)
 446 {
 447     LONG ret = EXCEPTION_CONTINUE_SEARCH;
 448     MSVCRT___sighandler_t handler;
 449
 450     if (!except || !except->ExceptionRecord)
 451         return EXCEPTION_CONTINUE_SEARCH;
 452
 453     switch (except->ExceptionRecord->ExceptionCode)
 454     {
 455     case EXCEPTION_ACCESS_VIOLATION:
 456         if ((handler = sighandlers[MSVCRT_SIGSEGV]) != MSVCRT_SIG_DFL)
 457         {
 458             if (handler != MSVCRT_SIG_IGN)
 459             {
 460                 sighandlers[MSVCRT_SIGSEGV] = MSVCRT_SIG_DFL;
 461                 handler(MSVCRT_SIGSEGV);
 462             }
 463             ret = EXCEPTION_CONTINUE_EXECUTION;
 464         }
 465         break;
 466     /* According to msdn,
 467      * the FPE signal handler takes as a second argument the type of
 468      * floating point exception.
 469      */
 470     case EXCEPTION_FLT_DENORMAL_OPERAND:
 471     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
 472     case EXCEPTION_FLT_INEXACT_RESULT:
 473     case EXCEPTION_FLT_INVALID_OPERATION:
 474     case EXCEPTION_FLT_OVERFLOW:
 475     case EXCEPTION_FLT_STACK_CHECK:
 476     case EXCEPTION_FLT_UNDERFLOW:
 477         if ((handler = sighandlers[MSVCRT_SIGFPE]) != MSVCRT_SIG_DFL)
 478         {
 479             if (handler != MSVCRT_SIG_IGN)
 480             {
 481                 int i, float_signal = _FPE_INVALID;
 482
 483                 sighandlers[MSVCRT_SIGFPE] = MSVCRT_SIG_DFL;
 484                 for (i = 0; i < sizeof(float_exception_map) /
 485                          sizeof(float_exception_map[0]); i++)
 486                 {
 487                     if (float_exception_map[i].status ==
 488                         except->ExceptionRecord->ExceptionCode)
 489                     {
 490                         float_signal = float_exception_map[i].signal;
 491                         break;
 492                     }
 493                 }
 494                 ((float_handler)handler)(MSVCRT_SIGFPE, float_signal);
 495             }
 496             ret = EXCEPTION_CONTINUE_EXECUTION;
 497         }
 498         break;
 499     case EXCEPTION_ILLEGAL_INSTRUCTION:
 500     case EXCEPTION_PRIV_INSTRUCTION:
 501         if ((handler = sighandlers[MSVCRT_SIGILL]) != MSVCRT_SIG_DFL)
 502         {
 503             if (handler != MSVCRT_SIG_IGN)
 504             {
 505                 sighandlers[MSVCRT_SIGILL] = MSVCRT_SIG_DFL;
 506                 handler(MSVCRT_SIGILL);
 507             }
 508             ret = EXCEPTION_CONTINUE_EXECUTION;
 509         }
 510         break;
 511     }
 512     return ret;
 513 }
 514
 515 void msvcrt_init_signals(void)
 516 {
 517     SetConsoleCtrlHandler(msvcrt_console_handler, TRUE);
 518     SetUnhandledExceptionFilter(msvcrt_exception_filter);
 519 }
 520
 521 void msvcrt_free_signals(void)
 522 {
 523     SetConsoleCtrlHandler(msvcrt_console_handler, FALSE);
 524     SetUnhandledExceptionFilter(NULL);
 525 }
 526
 527 /*********************************************************************
 528  *              signal (MSVCRT.@)
 529  * Some signals may never be generated except through an explicit call to
 530  * raise.
 531  */
 532 MSVCRT___sighandler_t CDECL MSVCRT_signal(int sig, MSVCRT___sighandler_t func)
 533 {
 534     MSVCRT___sighandler_t ret = MSVCRT_SIG_ERR;
 535
 536     TRACE("(%d, %p)\n", sig, func);
 537
 538     if (func == MSVCRT_SIG_ERR) return MSVCRT_SIG_ERR;
 539
 540     switch (sig)
 541     {
 542     /* Cases handled internally.  Note SIGTERM is never generated by Windows,
 543      * so we effectively mask it.
 544      */
 545     case MSVCRT_SIGABRT:
 546     case MSVCRT_SIGFPE:
 547     case MSVCRT_SIGILL:
 548     case MSVCRT_SIGSEGV:
 549     case MSVCRT_SIGINT:
 550     case MSVCRT_SIGTERM:
 551         ret = sighandlers[sig];
 552         sighandlers[sig] = func;
 553         break;
 554     default:
 555         ret = MSVCRT_SIG_ERR;
 556     }
 557     return ret;
 558 }
 559
 560 /*********************************************************************
 561  *              raise (MSVCRT.@)
 562  */
 563 int CDECL MSVCRT_raise(int sig)
 564 {
 565     MSVCRT___sighandler_t handler;
 566
 567     TRACE("(%d)\n", sig);
 568
 569     switch (sig)
 570     {
 571     case MSVCRT_SIGABRT:
 572     case MSVCRT_SIGFPE:
 573     case MSVCRT_SIGILL:
 574     case MSVCRT_SIGSEGV:
 575     case MSVCRT_SIGINT:
 576     case MSVCRT_SIGTERM:
 577         handler = sighandlers[sig];
 578         if (handler == MSVCRT_SIG_DFL) MSVCRT__exit(3);
 579         if (handler != MSVCRT_SIG_IGN)
 580         {
 581             sighandlers[sig] = MSVCRT_SIG_DFL;
 582             if (sig == MSVCRT_SIGFPE)
 583                 ((float_handler)handler)(sig, _FPE_EXPLICITGEN);
 584             else
 585                 handler(sig);
 586         }
 587         break;
 588     default:
 589         return -1;
 590     }
 591     return 0;
 592 }
 593
 594 /*********************************************************************
 595  *              _XcptFilter (MSVCRT.@)
 596  */
 597 int CDECL _XcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
 598 {
 599     TRACE("(%08x,%p)\n", ex, ptr);
 600     /* I assume ptr->ExceptionRecord->ExceptionCode is the same as ex */
 601     return msvcrt_exception_filter(ptr);
 602 }