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 "wine/debug.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  39
  40 /* VC++ extensions to Win32 SEH */
  41 typedef struct _SCOPETABLE
  42 {
  43   int previousTryLevel;
  44   int (*lpfnFilter)(PEXCEPTION_POINTERS);
  45   int (*lpfnHandler)(void);
  46 } SCOPETABLE, *PSCOPETABLE;
  47
  48 typedef struct _MSVCRT_EXCEPTION_FRAME
  49 {
  50   EXCEPTION_REGISTRATION_RECORD *prev;
  51   void (*handler)(PEXCEPTION_RECORD, EXCEPTION_REGISTRATION_RECORD*,
  52                   PCONTEXT, PEXCEPTION_RECORD);
  53   PSCOPETABLE scopetable;
  54   int trylevel;
  55   int _ebp;
  56   PEXCEPTION_POINTERS xpointers;
  57 } MSVCRT_EXCEPTION_FRAME;
  58
  59 #define TRYLEVEL_END (-1) /* End of trylevel list */
  60
  61 #if defined(__GNUC__) && defined(__i386__)
  62 static inline void call_finally_block( void *code_block, void *base_ptr )
  63 {
  64     __asm__ __volatile__ ("movl %1,%%ebp; call *%%eax"
  65                           : : "a" (code_block), "g" (base_ptr));
  66 }
  67
  68 static inline int call_filter( int (*func)(PEXCEPTION_POINTERS), void *arg, void *ebp )
  69 {
  70     int ret;
  71     __asm__ __volatile__ ("pushl %%ebp; pushl %3; movl %2,%%ebp; call *%%eax; popl %%ebp; popl %%ebp"
  72                           : "=a" (ret)
  73                           : "0" (func), "r" (ebp), "r" (arg)
  74                           : "ecx", "edx", "memory" );
  75     return ret;
  76 }
  77
  78 static inline int call_unwind_func( int (*func)(void), void *ebp )
  79 {
  80     int ret;
  81     __asm__ __volatile__ ("pushl %%ebp\n\t"
  82                           "pushl %%ebx\n\t"
  83                           "pushl %%esi\n\t"
  84                           "pushl %%edi\n\t"
  85                           "movl %2,%%ebp\n\t"
  86                           "call *%0\n\t"
  87                           "popl %%edi\n\t"
  88                           "popl %%esi\n\t"
  89                           "popl %%ebx\n\t"
  90                           "popl %%ebp"
  91                           : "=a" (ret)
  92                           : "0" (func), "r" (ebp)
  93                           : "ecx", "edx", "memory" );
  94     return ret;
  95 }
  96
  97 #endif
  98
  99
 100 #ifdef __i386__
 101
 102 static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec,
 103                                    EXCEPTION_REGISTRATION_RECORD* frame,
 104                                    PCONTEXT context,
 105                                    EXCEPTION_REGISTRATION_RECORD** dispatch)
 106 {
 107   if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
 108     return ExceptionContinueSearch;
 109   *dispatch = frame;
 110   return ExceptionCollidedUnwind;
 111 }
 112
 113
 114 /*********************************************************************
 115  *              _EH_prolog (MSVCRT.@)
 116  */
 117
 118 /* Provided for VC++ binary compatibility only */
 119 __ASM_GLOBAL_FUNC(_EH_prolog,
 120                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")  /* skip ret addr */
 121                   "pushl $-1\n\t"
 122                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 123                   "pushl %eax\n\t"
 124                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 125                   "pushl %fs:0\n\t"
 126                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 127                   "movl  %esp, %fs:0\n\t"
 128                   "movl  12(%esp), %eax\n\t"
 129                   "movl  %ebp, 12(%esp)\n\t"
 130                   "leal  12(%esp), %ebp\n\t"
 131                   "pushl %eax\n\t"
 132                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 133                   "ret")
 134
 135 static void msvcrt_local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp)
 136 {
 137   EXCEPTION_REGISTRATION_RECORD reg;
 138
 139   TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel);
 140
 141   /* Register a handler in case of a nested exception */
 142   reg.Handler = MSVCRT_nested_handler;
 143   reg.Prev = NtCurrentTeb()->Tib.ExceptionList;
 144   __wine_push_frame(&reg);
 145
 146   while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel)
 147   {
 148       int level = frame->trylevel;
 149       frame->trylevel = frame->scopetable[level].previousTryLevel;
 150       if (!frame->scopetable[level].lpfnFilter)
 151       {
 152           TRACE( "__try block cleanup level %d handler %p ebp %p\n",
 153                  level, frame->scopetable[level].lpfnHandler, ebp );
 154           call_unwind_func( frame->scopetable[level].lpfnHandler, ebp );
 155       }
 156   }
 157   __wine_pop_frame(&reg);
 158   TRACE("unwound OK\n");
 159 }
 160
 161 /*******************************************************************
 162  *              _local_unwind2 (MSVCRT.@)
 163  */
 164 void CDECL _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel)
 165 {
 166     msvcrt_local_unwind2( frame, trylevel, &frame->_ebp );
 167 }
 168
 169 #endif  /* __i386__ */
 170
 171 /*******************************************************************
 172  *              _global_unwind2 (MSVCRT.@)
 173  */
 174 void CDECL _global_unwind2(EXCEPTION_REGISTRATION_RECORD* frame)
 175 {
 176     TRACE("(%p)\n",frame);
 177     RtlUnwind( frame, 0, 0, 0 );
 178 }
 179
 180 /*********************************************************************
 181  *              _except_handler2 (MSVCRT.@)
 182  */
 183 int CDECL _except_handler2(PEXCEPTION_RECORD rec,
 184                            EXCEPTION_REGISTRATION_RECORD* frame,
 185                            PCONTEXT context,
 186                            EXCEPTION_REGISTRATION_RECORD** dispatcher)
 187 {
 188   FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n",
 189         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 190         frame->Handler, context, dispatcher);
 191   return ExceptionContinueSearch;
 192 }
 193
 194 /*********************************************************************
 195  *              _except_handler3 (MSVCRT.@)
 196  */
 197 int CDECL _except_handler3(PEXCEPTION_RECORD rec,
 198                            MSVCRT_EXCEPTION_FRAME* frame,
 199                            PCONTEXT context, void* dispatcher)
 200 {
 201 #if defined(__GNUC__) && defined(__i386__)
 202   int retval, trylevel;
 203   EXCEPTION_POINTERS exceptPtrs;
 204   PSCOPETABLE pScopeTable;
 205
 206   TRACE("exception %x flags=%x at %p handler=%p %p %p semi-stub\n",
 207         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 208         frame->handler, context, dispatcher);
 209
 210   __asm__ __volatile__ ("cld");
 211
 212   if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
 213   {
 214     /* Unwinding the current frame */
 215     msvcrt_local_unwind2(frame, TRYLEVEL_END, &frame->_ebp);
 216     TRACE("unwound current frame, returning ExceptionContinueSearch\n");
 217     return ExceptionContinueSearch;
 218   }
 219   else
 220   {
 221     /* Hunting for handler */
 222     exceptPtrs.ExceptionRecord = rec;
 223     exceptPtrs.ContextRecord = context;
 224     *((DWORD *)frame-1) = (DWORD)&exceptPtrs;
 225     trylevel = frame->trylevel;
 226     pScopeTable = frame->scopetable;
 227
 228     while (trylevel != TRYLEVEL_END)
 229     {
 230       TRACE( "level %d prev %d filter %p\n", trylevel, pScopeTable[trylevel].previousTryLevel,
 231              pScopeTable[trylevel].lpfnFilter );
 232       if (pScopeTable[trylevel].lpfnFilter)
 233       {
 234         retval = call_filter( pScopeTable[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp );
 235
 236         TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ?
 237               "CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ?
 238               "EXECUTE_HANDLER" : "CONTINUE_SEARCH");
 239
 240         if (retval == EXCEPTION_CONTINUE_EXECUTION)
 241           return ExceptionContinueExecution;
 242
 243         if (retval == EXCEPTION_EXECUTE_HANDLER)
 244         {
 245           /* Unwind all higher frames, this one will handle the exception */
 246           _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame);
 247           msvcrt_local_unwind2(frame, trylevel, &frame->_ebp);
 248
 249           /* Set our trylevel to the enclosing block, and call the __finally
 250            * code, which won't return
 251            */
 252           frame->trylevel = pScopeTable[trylevel].previousTryLevel;
 253           TRACE("__finally block %p\n",pScopeTable[trylevel].lpfnHandler);
 254           call_finally_block(pScopeTable[trylevel].lpfnHandler, &frame->_ebp);
 255           ERR("Returned from __finally block - expect crash!\n");
 256        }
 257       }
 258       trylevel = pScopeTable[trylevel].previousTryLevel;
 259     }
 260   }
 261 #else
 262   FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n",
 263         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 264         frame->handler, context, dispatcher);
 265 #endif
 266   TRACE("reached TRYLEVEL_END, returning ExceptionContinueSearch\n");
 267   return ExceptionContinueSearch;
 268 }
 269
 270 /*********************************************************************
 271  *              _abnormal_termination (MSVCRT.@)
 272  */
 273 int CDECL _abnormal_termination(void)
 274 {
 275   FIXME("(void)stub\n");
 276   return 0;
 277 }
 278
 279 /*
 280  * setjmp/longjmp implementation
 281  */
 282
 283 #ifdef __i386__
 284 #define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */
 285 typedef void (__stdcall *MSVCRT_unwind_function)(const struct MSVCRT___JUMP_BUFFER *);
 286
 287 /* define an entrypoint for setjmp/setjmp3 that stores the registers in the jmp buf */
 288 /* and then jumps to the C backend function */
 289 #define DEFINE_SETJMP_ENTRYPOINT(name) \
 290     __ASM_GLOBAL_FUNC( name, \
 291                        "movl 4(%esp),%ecx\n\t"   /* jmp_buf */      \
 292                        "movl %ebp,0(%ecx)\n\t"   /* jmp_buf.Ebp */  \
 293                        "movl %ebx,4(%ecx)\n\t"   /* jmp_buf.Ebx */  \
 294                        "movl %edi,8(%ecx)\n\t"   /* jmp_buf.Edi */  \
 295                        "movl %esi,12(%ecx)\n\t"  /* jmp_buf.Esi */  \
 296                        "movl %esp,16(%ecx)\n\t"  /* jmp_buf.Esp */  \
 297                        "movl 0(%esp),%eax\n\t"                      \
 298                        "movl %eax,20(%ecx)\n\t"  /* jmp_buf.Eip */  \
 299                        "jmp " __ASM_NAME("__regs_") # name )
 300
 301 /* restore the registers from the jmp buf upon longjmp */
 302 extern void DECLSPEC_NORETURN longjmp_set_regs( struct MSVCRT___JUMP_BUFFER *jmp, int retval );
 303 __ASM_GLOBAL_FUNC( longjmp_set_regs,
 304                    "movl 4(%esp),%ecx\n\t"   /* jmp_buf */
 305                    "movl 8(%esp),%eax\n\t"   /* retval */
 306                    "movl 0(%ecx),%ebp\n\t"   /* jmp_buf.Ebp */
 307                    "movl 4(%ecx),%ebx\n\t"   /* jmp_buf.Ebx */
 308                    "movl 8(%ecx),%edi\n\t"   /* jmp_buf.Edi */
 309                    "movl 12(%ecx),%esi\n\t"  /* jmp_buf.Esi */
 310                    "movl 16(%ecx),%esp\n\t"  /* jmp_buf.Esp */
 311                    "addl $4,%esp\n\t"        /* get rid of return address */
 312                    "jmp *20(%ecx)\n\t"       /* jmp_buf.Eip */ )
 313
 314 /*
 315  * The signatures of the setjmp/longjmp functions do not match that
 316  * declared in the setjmp header so they don't follow the regular naming
 317  * convention to avoid conflicts.
 318  */
 319
 320 /*******************************************************************
 321  *              _setjmp (MSVCRT.@)
 322  */
 323 DEFINE_SETJMP_ENTRYPOINT(MSVCRT__setjmp)
 324 int CDECL __regs_MSVCRT__setjmp(struct MSVCRT___JUMP_BUFFER *jmp)
 325 {
 326     jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 327     if (jmp->Registration == ~0UL)
 328         jmp->TryLevel = TRYLEVEL_END;
 329     else
 330         jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
 331
 332     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
 333           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
 334     return 0;
 335 }
 336
 337 /*******************************************************************
 338  *              _setjmp3 (MSVCRT.@)
 339  */
 340 DEFINE_SETJMP_ENTRYPOINT( MSVCRT__setjmp3 )
 341 int CDECL __regs_MSVCRT__setjmp3(struct MSVCRT___JUMP_BUFFER *jmp, int nb_args, ...)
 342 {
 343     jmp->Cookie = MSVCRT_JMP_MAGIC;
 344     jmp->UnwindFunc = 0;
 345     jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 346     if (jmp->Registration == ~0UL)
 347     {
 348         jmp->TryLevel = TRYLEVEL_END;
 349     }
 350     else
 351     {
 352         int i;
 353         va_list args;
 354
 355         va_start( args, nb_args );
 356         if (nb_args > 0) jmp->UnwindFunc = va_arg( args, unsigned long );
 357         if (nb_args > 1) jmp->TryLevel = va_arg( args, unsigned long );
 358         else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
 359         for (i = 0; i < 6 && i < nb_args - 2; i++)
 360             jmp->UnwindData[i] = va_arg( args, unsigned long );
 361         va_end( args );
 362     }
 363
 364     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
 365           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
 366     return 0;
 367 }
 368
 369 /*********************************************************************
 370  *              longjmp (MSVCRT.@)
 371  */
 372 int CDECL MSVCRT_longjmp(struct MSVCRT___JUMP_BUFFER *jmp, int retval)
 373 {
 374     unsigned long cur_frame = 0;
 375
 376     TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx retval=%08x\n",
 377           jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration, retval );
 378
 379     cur_frame=(unsigned long)NtCurrentTeb()->Tib.ExceptionList;
 380     TRACE("cur_frame=%lx\n",cur_frame);
 381
 382     if (cur_frame != jmp->Registration)
 383         _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)jmp->Registration);
 384
 385     if (jmp->Registration)
 386     {
 387         if (!IsBadReadPtr(&jmp->Cookie, sizeof(long)) &&
 388             jmp->Cookie == MSVCRT_JMP_MAGIC && jmp->UnwindFunc)
 389         {
 390             MSVCRT_unwind_function unwind_func;
 391
 392             unwind_func=(MSVCRT_unwind_function)jmp->UnwindFunc;
 393             unwind_func(jmp);
 394         }
 395         else
 396             msvcrt_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration,
 397                                  jmp->TryLevel, (void *)jmp->Ebp);
 398     }
 399
 400     if (!retval)
 401         retval = 1;
 402
 403     longjmp_set_regs( jmp, retval );
 404 }
 405
 406 /*********************************************************************
 407  *              _seh_longjmp_unwind (MSVCRT.@)
 408  */
 409 void __stdcall _seh_longjmp_unwind(struct MSVCRT___JUMP_BUFFER *jmp)
 410 {
 411     msvcrt_local_unwind2( (MSVCRT_EXCEPTION_FRAME *)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp );
 412 }
 413 #endif /* i386 */
 414
 415 static MSVCRT___sighandler_t sighandlers[MSVCRT_NSIG] = { MSVCRT_SIG_DFL };
 416
 417 static BOOL WINAPI msvcrt_console_handler(DWORD ctrlType)
 418 {
 419     BOOL ret = FALSE;
 420
 421     switch (ctrlType)
 422     {
 423     case CTRL_C_EVENT:
 424         if (sighandlers[MSVCRT_SIGINT])
 425         {
 426             if (sighandlers[MSVCRT_SIGINT] != MSVCRT_SIG_IGN)
 427                 sighandlers[MSVCRT_SIGINT](MSVCRT_SIGINT);
 428             ret = TRUE;
 429         }
 430         break;
 431     }
 432     return ret;
 433 }
 434
 435 typedef void (*float_handler)(int, int);
 436
 437 /* The exception codes are actually NTSTATUS values */
 438 static const struct
 439 {
 440     NTSTATUS status;
 441     int signal;
 442 } float_exception_map[] = {
 443  { EXCEPTION_FLT_DENORMAL_OPERAND, MSVCRT__FPE_DENORMAL },
 444  { EXCEPTION_FLT_DIVIDE_BY_ZERO, MSVCRT__FPE_ZERODIVIDE },
 445  { EXCEPTION_FLT_INEXACT_RESULT, MSVCRT__FPE_INEXACT },
 446  { EXCEPTION_FLT_INVALID_OPERATION, MSVCRT__FPE_INVALID },
 447  { EXCEPTION_FLT_OVERFLOW, MSVCRT__FPE_OVERFLOW },
 448  { EXCEPTION_FLT_STACK_CHECK, MSVCRT__FPE_STACKOVERFLOW },
 449  { EXCEPTION_FLT_UNDERFLOW, MSVCRT__FPE_UNDERFLOW },
 450 };
 451
 452 static LONG WINAPI msvcrt_exception_filter(struct _EXCEPTION_POINTERS *except)
 453 {
 454     LONG ret = EXCEPTION_CONTINUE_SEARCH;
 455     MSVCRT___sighandler_t handler;
 456
 457     if (!except || !except->ExceptionRecord)
 458         return EXCEPTION_CONTINUE_SEARCH;
 459
 460     switch (except->ExceptionRecord->ExceptionCode)
 461     {
 462     case EXCEPTION_ACCESS_VIOLATION:
 463         if ((handler = sighandlers[MSVCRT_SIGSEGV]) != MSVCRT_SIG_DFL)
 464         {
 465             if (handler != MSVCRT_SIG_IGN)
 466             {
 467                 sighandlers[MSVCRT_SIGSEGV] = MSVCRT_SIG_DFL;
 468                 handler(MSVCRT_SIGSEGV);
 469             }
 470             ret = EXCEPTION_CONTINUE_EXECUTION;
 471         }
 472         break;
 473     /* According to msdn,
 474      * the FPE signal handler takes as a second argument the type of
 475      * floating point exception.
 476      */
 477     case EXCEPTION_FLT_DENORMAL_OPERAND:
 478     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
 479     case EXCEPTION_FLT_INEXACT_RESULT:
 480     case EXCEPTION_FLT_INVALID_OPERATION:
 481     case EXCEPTION_FLT_OVERFLOW:
 482     case EXCEPTION_FLT_STACK_CHECK:
 483     case EXCEPTION_FLT_UNDERFLOW:
 484         if ((handler = sighandlers[MSVCRT_SIGFPE]) != MSVCRT_SIG_DFL)
 485         {
 486             if (handler != MSVCRT_SIG_IGN)
 487             {
 488                 unsigned int i;
 489                 int float_signal = MSVCRT__FPE_INVALID;
 490
 491                 sighandlers[MSVCRT_SIGFPE] = MSVCRT_SIG_DFL;
 492                 for (i = 0; i < sizeof(float_exception_map) /
 493                          sizeof(float_exception_map[0]); i++)
 494                 {
 495                     if (float_exception_map[i].status ==
 496                         except->ExceptionRecord->ExceptionCode)
 497                     {
 498                         float_signal = float_exception_map[i].signal;
 499                         break;
 500                     }
 501                 }
 502                 ((float_handler)handler)(MSVCRT_SIGFPE, float_signal);
 503             }
 504             ret = EXCEPTION_CONTINUE_EXECUTION;
 505         }
 506         break;
 507     case EXCEPTION_ILLEGAL_INSTRUCTION:
 508     case EXCEPTION_PRIV_INSTRUCTION:
 509         if ((handler = sighandlers[MSVCRT_SIGILL]) != MSVCRT_SIG_DFL)
 510         {
 511             if (handler != MSVCRT_SIG_IGN)
 512             {
 513                 sighandlers[MSVCRT_SIGILL] = MSVCRT_SIG_DFL;
 514                 handler(MSVCRT_SIGILL);
 515             }
 516             ret = EXCEPTION_CONTINUE_EXECUTION;
 517         }
 518         break;
 519     }
 520     return ret;
 521 }
 522
 523 void msvcrt_init_signals(void)
 524 {
 525     SetConsoleCtrlHandler(msvcrt_console_handler, TRUE);
 526     SetUnhandledExceptionFilter(msvcrt_exception_filter);
 527 }
 528
 529 void msvcrt_free_signals(void)
 530 {
 531     SetConsoleCtrlHandler(msvcrt_console_handler, FALSE);
 532     SetUnhandledExceptionFilter(NULL);
 533 }
 534
 535 /*********************************************************************
 536  *              signal (MSVCRT.@)
 537  * Some signals may never be generated except through an explicit call to
 538  * raise.
 539  */
 540 MSVCRT___sighandler_t CDECL MSVCRT_signal(int sig, MSVCRT___sighandler_t func)
 541 {
 542     MSVCRT___sighandler_t ret = MSVCRT_SIG_ERR;
 543
 544     TRACE("(%d, %p)\n", sig, func);
 545
 546     if (func == MSVCRT_SIG_ERR) return MSVCRT_SIG_ERR;
 547
 548     switch (sig)
 549     {
 550     /* Cases handled internally.  Note SIGTERM is never generated by Windows,
 551      * so we effectively mask it.
 552      */
 553     case MSVCRT_SIGABRT:
 554     case MSVCRT_SIGFPE:
 555     case MSVCRT_SIGILL:
 556     case MSVCRT_SIGSEGV:
 557     case MSVCRT_SIGINT:
 558     case MSVCRT_SIGTERM:
 559         ret = sighandlers[sig];
 560         sighandlers[sig] = func;
 561         break;
 562     default:
 563         ret = MSVCRT_SIG_ERR;
 564     }
 565     return ret;
 566 }
 567
 568 /*********************************************************************
 569  *              raise (MSVCRT.@)
 570  */
 571 int CDECL MSVCRT_raise(int sig)
 572 {
 573     MSVCRT___sighandler_t handler;
 574
 575     TRACE("(%d)\n", sig);
 576
 577     switch (sig)
 578     {
 579     case MSVCRT_SIGABRT:
 580     case MSVCRT_SIGFPE:
 581     case MSVCRT_SIGILL:
 582     case MSVCRT_SIGSEGV:
 583     case MSVCRT_SIGINT:
 584     case MSVCRT_SIGTERM:
 585         handler = sighandlers[sig];
 586         if (handler == MSVCRT_SIG_DFL) MSVCRT__exit(3);
 587         if (handler != MSVCRT_SIG_IGN)
 588         {
 589             sighandlers[sig] = MSVCRT_SIG_DFL;
 590             if (sig == MSVCRT_SIGFPE)
 591                 ((float_handler)handler)(sig, MSVCRT__FPE_EXPLICITGEN);
 592             else
 593                 handler(sig);
 594         }
 595         break;
 596     default:
 597         return -1;
 598     }
 599     return 0;
 600 }
 601
 602 /*********************************************************************
 603  *              _XcptFilter (MSVCRT.@)
 604  */
 605 int CDECL _XcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
 606 {
 607     TRACE("(%08x,%p)\n", ex, ptr);
 608     /* I assume ptr->ExceptionRecord->ExceptionCode is the same as ex */
 609     return msvcrt_exception_filter(ptr);
 610 }