server/debugger.c

   1 /*
   2  * Server-side debugger functions
   3  *
   4  * Copyright (C) 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <signal.h>
  26 #include <string.h>
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29
  30 #include "ntstatus.h"
  31 #define WIN32_NO_STATUS
  32 #include "windef.h"
  33 #include "winternl.h"
  34
  35 #include "handle.h"
  36 #include "process.h"
  37 #include "thread.h"
  38 #include "request.h"
  39
  40 enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
  41
  42 /* debug event */
  43 struct debug_event
  44 {
  45     struct object          obj;       /* object header */
  46     struct list            entry;     /* entry in event queue */
  47     struct thread         *sender;    /* thread which sent this event */
  48     struct thread         *debugger;  /* debugger thread receiving the event */
  49     enum debug_event_state state;     /* event state */
  50     int                    status;    /* continuation status */
  51     debug_event_t          data;      /* event data */
  52     CONTEXT                context;   /* register context */
  53 };
  54
  55 /* debug context */
  56 struct debug_ctx
  57 {
  58     struct object        obj;         /* object header */
  59     struct list          event_queue; /* pending events queue */
  60     int                  kill_on_exit;/* kill debuggees on debugger exit ? */
  61 };
  62
  63
  64 static void debug_event_dump( struct object *obj, int verbose );
  65 static int debug_event_signaled( struct object *obj, struct thread *thread );
  66 static void debug_event_destroy( struct object *obj );
  67
  68 static const struct object_ops debug_event_ops =
  69 {
  70     sizeof(struct debug_event),    /* size */
  71     debug_event_dump,              /* dump */
  72     add_queue,                     /* add_queue */
  73     remove_queue,                  /* remove_queue */
  74     debug_event_signaled,          /* signaled */
  75     no_satisfied,                  /* satisfied */
  76     no_signal,                     /* signal */
  77     no_get_fd,                     /* get_fd */
  78     no_map_access,                 /* map_access */
  79     default_get_sd,                /* get_sd */
  80     default_set_sd,                /* set_sd */
  81     no_lookup_name,                /* lookup_name */
  82     no_open_file,                  /* open_file */
  83     no_close_handle,               /* close_handle */
  84     debug_event_destroy            /* destroy */
  85 };
  86
  87 static void debug_ctx_dump( struct object *obj, int verbose );
  88 static int debug_ctx_signaled( struct object *obj, struct thread *thread );
  89 static void debug_ctx_destroy( struct object *obj );
  90
  91 static const struct object_ops debug_ctx_ops =
  92 {
  93     sizeof(struct debug_ctx),      /* size */
  94     debug_ctx_dump,                /* dump */
  95     add_queue,                     /* add_queue */
  96     remove_queue,                  /* remove_queue */
  97     debug_ctx_signaled,            /* signaled */
  98     no_satisfied,                  /* satisfied */
  99     no_signal,                     /* signal */
 100     no_get_fd,                     /* get_fd */
 101     no_map_access,                 /* map_access */
 102     default_get_sd,                /* get_sd */
 103     default_set_sd,                /* set_sd */
 104     no_lookup_name,                /* lookup_name */
 105     no_open_file,                  /* open_file */
 106     no_close_handle,               /* close_handle */
 107     debug_ctx_destroy              /* destroy */
 108 };
 109
 110
 111 /* routines to build an event according to its type */
 112
 113 static int fill_exception_event( struct debug_event *event, void *arg )
 114 {
 115     memcpy( &event->data.info.exception, arg, sizeof(event->data.info.exception) );
 116     return 1;
 117 }
 118
 119 static int fill_create_thread_event( struct debug_event *event, void *arg )
 120 {
 121     struct process *debugger = event->debugger->process;
 122     struct thread *thread = event->sender;
 123     obj_handle_t handle;
 124
 125     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 126     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 ))) return 0;
 127     event->data.info.create_thread.handle = handle;
 128     event->data.info.create_thread.teb    = thread->teb;
 129     event->data.info.create_thread.start  = arg;
 130     return 1;
 131 }
 132
 133 static int fill_create_process_event( struct debug_event *event, void *arg )
 134 {
 135     struct process *debugger = event->debugger->process;
 136     struct thread *thread = event->sender;
 137     struct process *process = thread->process;
 138     struct process_dll *exe_module = get_process_exe_module( process );
 139     obj_handle_t handle;
 140
 141     /* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
 142     if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, 0 ))) return 0;
 143     event->data.info.create_process.process = handle;
 144
 145     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 146     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 )))
 147     {
 148         close_handle( debugger, event->data.info.create_process.process );
 149         return 0;
 150     }
 151     event->data.info.create_process.thread = handle;
 152
 153     handle = 0;
 154     if (exe_module->file &&
 155         /* the doc says write access too, but this doesn't seem a good idea */
 156         !(handle = alloc_handle( debugger, exe_module->file, GENERIC_READ, 0 )))
 157     {
 158         close_handle( debugger, event->data.info.create_process.process );
 159         close_handle( debugger, event->data.info.create_process.thread );
 160         return 0;
 161     }
 162     event->data.info.create_process.file       = handle;
 163     event->data.info.create_process.teb        = thread->teb;
 164     event->data.info.create_process.base       = exe_module->base;
 165     event->data.info.create_process.start      = arg;
 166     event->data.info.create_process.dbg_offset = exe_module->dbg_offset;
 167     event->data.info.create_process.dbg_size   = exe_module->dbg_size;
 168     event->data.info.create_process.name       = exe_module->name;
 169     event->data.info.create_process.unicode    = 1;
 170     return 1;
 171 }
 172
 173 static int fill_exit_thread_event( struct debug_event *event, void *arg )
 174 {
 175     struct thread *thread = arg;
 176     event->data.info.exit.exit_code = thread->exit_code;
 177     return 1;
 178 }
 179
 180 static int fill_exit_process_event( struct debug_event *event, void *arg )
 181 {
 182     struct process *process = arg;
 183     event->data.info.exit.exit_code = process->exit_code;
 184     return 1;
 185 }
 186
 187 static int fill_load_dll_event( struct debug_event *event, void *arg )
 188 {
 189     struct process *debugger = event->debugger->process;
 190     struct process_dll *dll = arg;
 191     obj_handle_t handle = 0;
 192
 193     if (dll->file && !(handle = alloc_handle( debugger, dll->file, GENERIC_READ, 0 )))
 194         return 0;
 195     event->data.info.load_dll.handle     = handle;
 196     event->data.info.load_dll.base       = dll->base;
 197     event->data.info.load_dll.dbg_offset = dll->dbg_offset;
 198     event->data.info.load_dll.dbg_size   = dll->dbg_size;
 199     event->data.info.load_dll.name       = dll->name;
 200     event->data.info.load_dll.unicode    = 1;
 201     return 1;
 202 }
 203
 204 static int fill_unload_dll_event( struct debug_event *event, void *arg )
 205 {
 206     event->data.info.unload_dll.base = arg;
 207     return 1;
 208 }
 209
 210 static int fill_output_debug_string_event( struct debug_event *event, void *arg )
 211 {
 212     struct debug_event_output_string *data = arg;
 213     event->data.info.output_string = *data;
 214     return 1;
 215 }
 216
 217 typedef int (*fill_event_func)( struct debug_event *event, void *arg );
 218
 219 #define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT  /* RIP_EVENT not supported */
 220
 221 static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
 222 {
 223     fill_exception_event,            /* EXCEPTION_DEBUG_EVENT */
 224     fill_create_thread_event,        /* CREATE_THREAD_DEBUG_EVENT */
 225     fill_create_process_event,       /* CREATE_PROCESS_DEBUG_EVENT */
 226     fill_exit_thread_event,          /* EXIT_THREAD_DEBUG_EVENT */
 227     fill_exit_process_event,         /* EXIT_PROCESS_DEBUG_EVENT */
 228     fill_load_dll_event,             /* LOAD_DLL_DEBUG_EVENT */
 229     fill_unload_dll_event,           /* UNLOAD_DLL_DEBUG_EVENT */
 230     fill_output_debug_string_event   /* OUTPUT_DEBUG_STRING_EVENT */
 231 };
 232
 233
 234 /* unlink the first event from the queue */
 235 static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
 236 {
 237     list_remove( &event->entry );
 238     if (event->sender->debug_event == event) event->sender->debug_event = NULL;
 239     release_object( event );
 240 }
 241
 242 /* link an event at the end of the queue */
 243 static void link_event( struct debug_event *event )
 244 {
 245     struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
 246
 247     assert( debug_ctx );
 248     grab_object( event );
 249     list_add_tail( &debug_ctx->event_queue, &event->entry );
 250     if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
 251 }
 252
 253 /* find the next event that we can send to the debugger */
 254 static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
 255 {
 256     struct debug_event *event;
 257
 258     LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 259     {
 260         if (event->state == EVENT_SENT) continue;  /* already sent */
 261         if (event->sender->debug_event) continue;  /* thread busy with another one */
 262         return event;
 263     }
 264     return NULL;
 265 }
 266
 267 static void debug_event_dump( struct object *obj, int verbose )
 268 {
 269     struct debug_event *debug_event = (struct debug_event *)obj;
 270     assert( obj->ops == &debug_event_ops );
 271     fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
 272              debug_event->sender, debug_event->data.code, debug_event->state );
 273 }
 274
 275 static int debug_event_signaled( struct object *obj, struct thread *thread )
 276 {
 277     struct debug_event *debug_event = (struct debug_event *)obj;
 278     assert( obj->ops == &debug_event_ops );
 279     return debug_event->state == EVENT_CONTINUED;
 280 }
 281
 282 static void debug_event_destroy( struct object *obj )
 283 {
 284     struct debug_event *event = (struct debug_event *)obj;
 285     assert( obj->ops == &debug_event_ops );
 286
 287     /* If the event has been sent already, the handles are now under the */
 288     /* responsibility of the debugger process, so we don't touch them    */
 289     if (event->state == EVENT_QUEUED)
 290     {
 291         struct process *debugger = event->debugger->process;
 292         switch(event->data.code)
 293         {
 294         case CREATE_THREAD_DEBUG_EVENT:
 295             close_handle( debugger, event->data.info.create_thread.handle );
 296             break;
 297         case CREATE_PROCESS_DEBUG_EVENT:
 298             if (event->data.info.create_process.file)
 299                 close_handle( debugger, event->data.info.create_process.file );
 300             close_handle( debugger, event->data.info.create_process.thread );
 301             close_handle( debugger, event->data.info.create_process.process );
 302             break;
 303         case LOAD_DLL_DEBUG_EVENT:
 304             if (event->data.info.load_dll.handle)
 305                 close_handle( debugger, event->data.info.load_dll.handle );
 306             break;
 307         }
 308     }
 309     if (event->sender->context == &event->context) event->sender->context = NULL;
 310     release_object( event->sender );
 311     release_object( event->debugger );
 312 }
 313
 314 static void debug_ctx_dump( struct object *obj, int verbose )
 315 {
 316     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 317     assert( obj->ops == &debug_ctx_ops );
 318     fprintf( stderr, "Debug context head=%p tail=%p\n",
 319              debug_ctx->event_queue.next, debug_ctx->event_queue.prev );
 320 }
 321
 322 static int debug_ctx_signaled( struct object *obj, struct thread *thread )
 323 {
 324     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 325     assert( obj->ops == &debug_ctx_ops );
 326     return find_event_to_send( debug_ctx ) != NULL;
 327 }
 328
 329 static void debug_ctx_destroy( struct object *obj )
 330 {
 331     struct list *ptr;
 332     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 333     assert( obj->ops == &debug_ctx_ops );
 334
 335     /* free all pending events */
 336     while ((ptr = list_head( &debug_ctx->event_queue )))
 337         unlink_event( debug_ctx, LIST_ENTRY( ptr, struct debug_event, entry ));
 338 }
 339
 340 /* continue a debug event */
 341 static int continue_debug_event( struct process *process, struct thread *thread, int status )
 342 {
 343     struct debug_ctx *debug_ctx = current->debug_ctx;
 344
 345     if (debug_ctx && process->debugger == current && thread->process == process)
 346     {
 347         struct debug_event *event;
 348
 349         /* find the event in the queue */
 350         LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 351         {
 352             if (event->state != EVENT_SENT) continue;
 353             if (event->sender == thread)
 354             {
 355                 assert( event->sender->debug_event == event );
 356
 357                 event->status = status;
 358                 event->state  = EVENT_CONTINUED;
 359                 wake_up( &event->obj, 0 );
 360                 unlink_event( debug_ctx, event );
 361                 resume_process( process );
 362                 return 1;
 363             }
 364         }
 365     }
 366     /* not debugging this process, or no such event */
 367     set_error( STATUS_ACCESS_DENIED );  /* FIXME */
 368     return 0;
 369 }
 370
 371 /* alloc a debug event for a debugger */
 372 static struct debug_event *alloc_debug_event( struct thread *thread, int code,
 373                                               void *arg, const CONTEXT *context )
 374 {
 375     struct thread *debugger = thread->process->debugger;
 376     struct debug_event *event;
 377
 378     assert( code > 0 && code <= NB_DEBUG_EVENTS );
 379     /* cannot queue a debug event for myself */
 380     assert( debugger->process != thread->process );
 381
 382     /* build the event */
 383     if (!(event = alloc_object( &debug_event_ops ))) return NULL;
 384     event->state     = EVENT_QUEUED;
 385     event->sender    = (struct thread *)grab_object( thread );
 386     event->debugger  = (struct thread *)grab_object( debugger );
 387     event->data.code = code;
 388
 389     if (!fill_debug_event[code-1]( event, arg ))
 390     {
 391         event->data.code = -1;  /* make sure we don't attempt to close handles */
 392         release_object( event );
 393         return NULL;
 394     }
 395     if (context)
 396     {
 397         memcpy( &event->context, context, sizeof(event->context) );
 398         thread->context = &event->context;
 399     }
 400     return event;
 401 }
 402
 403 /* generate a debug event from inside the server and queue it */
 404 void generate_debug_event( struct thread *thread, int code, void *arg )
 405 {
 406     if (thread->process->debugger)
 407     {
 408         struct debug_event *event = alloc_debug_event( thread, code, arg, NULL );
 409         if (event)
 410         {
 411             link_event( event );
 412             suspend_process( thread->process );
 413             release_object( event );
 414         }
 415     }
 416 }
 417
 418 /* attach a process to a debugger thread and suspend it */
 419 static int debugger_attach( struct process *process, struct thread *debugger )
 420 {
 421     struct thread *thread;
 422
 423     if (process->debugger) goto error;  /* already being debugged */
 424     if (!is_process_init_done( process )) goto error;  /* still starting up */
 425     if (list_empty( &process->thread_list )) goto error;  /* no thread running in the process */
 426
 427     /* make sure we don't create a debugging loop */
 428     for (thread = debugger; thread; thread = thread->process->debugger)
 429         if (thread->process == process) goto error;
 430
 431     /* don't let a debugger debug its console... won't work */
 432     if (debugger->process->console && console_get_renderer(debugger->process->console)->process == process)
 433         goto error;
 434
 435     suspend_process( process );
 436     if (!set_process_debugger( process, debugger ))
 437     {
 438         resume_process( process );
 439         return 0;
 440     }
 441     if (!set_process_debug_flag( process, 1 ))
 442     {
 443         process->debugger = NULL;
 444         resume_process( process );
 445         return 0;
 446     }
 447     return 1;
 448
 449  error:
 450     set_error( STATUS_ACCESS_DENIED );
 451     return 0;
 452 }
 453
 454
 455 /* detach a process from a debugger thread (and resume it ?) */
 456 int debugger_detach( struct process *process, struct thread *debugger )
 457 {
 458     struct debug_event *event, *next;
 459     struct debug_ctx *debug_ctx;
 460
 461     if (!process->debugger || process->debugger != debugger)
 462         goto error;  /* not currently debugged, or debugged by another debugger */
 463     if (!debugger->debug_ctx ) goto error; /* should be a debugger */
 464     /* init should be done, otherwise wouldn't be attached */
 465     assert(is_process_init_done(process));
 466
 467     suspend_process( process );
 468     /* send continue indication for all events */
 469     debug_ctx = debugger->debug_ctx;
 470
 471     /* free all events from this process */
 472     LIST_FOR_EACH_ENTRY_SAFE( event, next, &debug_ctx->event_queue, struct debug_event, entry )
 473     {
 474         if (event->sender->process != process) continue;
 475
 476         assert( event->state != EVENT_CONTINUED );
 477         event->status = DBG_CONTINUE;
 478         event->state  = EVENT_CONTINUED;
 479         wake_up( &event->obj, 0 );
 480         unlink_event( debug_ctx, event );
 481         /* from queued debug event */
 482         resume_process( process );
 483     }
 484
 485     /* remove relationships between process and its debugger */
 486     process->debugger = NULL;
 487     if (!set_process_debug_flag( process, 0 )) clear_error();  /* ignore error */
 488
 489     /* from this function */
 490     resume_process( process );
 491     return 0;
 492
 493  error:
 494     set_error( STATUS_ACCESS_DENIED );
 495     return 0;
 496 }
 497
 498 /* generate all startup events of a given process */
 499 void generate_startup_debug_events( struct process *process, void *entry )
 500 {
 501     struct list *ptr;
 502     struct thread *thread, *first_thread = get_process_first_thread( process );
 503
 504     /* generate creation events */
 505     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 506     {
 507         if (thread == first_thread)
 508             generate_debug_event( thread, CREATE_PROCESS_DEBUG_EVENT, entry );
 509         else
 510             generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
 511     }
 512
 513     /* generate dll events (in loading order, i.e. reverse list order) */
 514     ptr = list_tail( &process->dlls );
 515     while (ptr)
 516     {
 517         struct process_dll *dll = LIST_ENTRY( ptr, struct process_dll, entry );
 518         generate_debug_event( first_thread, LOAD_DLL_DEBUG_EVENT, dll );
 519         ptr = list_prev( &process->dlls, ptr );
 520     }
 521 }
 522
 523 /* set the debugger of a given process */
 524 int set_process_debugger( struct process *process, struct thread *debugger )
 525 {
 526     struct debug_ctx *debug_ctx;
 527
 528     assert( !process->debugger );
 529
 530     if (!debugger->debug_ctx)  /* need to allocate a context */
 531     {
 532         if (!(debug_ctx = alloc_object( &debug_ctx_ops ))) return 0;
 533         debug_ctx->kill_on_exit = 1;
 534         list_init( &debug_ctx->event_queue );
 535         debugger->debug_ctx = debug_ctx;
 536     }
 537     process->debugger = debugger;
 538     return 1;
 539 }
 540
 541 /* a thread is exiting */
 542 void debug_exit_thread( struct thread *thread )
 543 {
 544     if (thread->debug_ctx)  /* this thread is a debugger */
 545     {
 546         if (thread->debug_ctx->kill_on_exit)
 547         {
 548             /* kill all debugged processes */
 549             kill_debugged_processes( thread, STATUS_DEBUGGER_INACTIVE );
 550         }
 551         else
 552         {
 553             detach_debugged_processes( thread );
 554         }
 555         release_object( thread->debug_ctx );
 556         thread->debug_ctx = NULL;
 557     }
 558 }
 559
 560 /* Wait for a debug event */
 561 DECL_HANDLER(wait_debug_event)
 562 {
 563     struct debug_ctx *debug_ctx = current->debug_ctx;
 564     struct debug_event *event;
 565
 566     if (!debug_ctx)  /* current thread is not a debugger */
 567     {
 568         set_error( STATUS_INVALID_HANDLE );
 569         return;
 570     }
 571     reply->wait = 0;
 572     if ((event = find_event_to_send( debug_ctx )))
 573     {
 574         data_size_t size = get_reply_max_size();
 575         event->state = EVENT_SENT;
 576         event->sender->debug_event = event;
 577         reply->pid = get_process_id( event->sender->process );
 578         reply->tid = get_thread_id( event->sender );
 579         if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
 580         set_reply_data( &event->data, size );
 581     }
 582     else  /* no event ready */
 583     {
 584         reply->pid  = 0;
 585         reply->tid  = 0;
 586         if (req->get_handle)
 587             reply->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, 0 );
 588     }
 589 }
 590
 591 /* Continue a debug event */
 592 DECL_HANDLER(continue_debug_event)
 593 {
 594     struct process *process = get_process_from_id( req->pid );
 595     if (process)
 596     {
 597         struct thread *thread = get_thread_from_id( req->tid );
 598         if (thread)
 599         {
 600             continue_debug_event( process, thread, req->status );
 601             release_object( thread );
 602         }
 603         release_object( process );
 604     }
 605 }
 606
 607 /* Start debugging an existing process */
 608 DECL_HANDLER(debug_process)
 609 {
 610     struct process *process = get_process_from_id( req->pid );
 611     if (!process) return;
 612
 613     if (!req->attach)
 614     {
 615         debugger_detach( process, current );
 616     }
 617     else if (debugger_attach( process, current ))
 618     {
 619         generate_startup_debug_events( process, NULL );
 620         break_process( process );
 621         resume_process( process );
 622     }
 623     release_object( process );
 624 }
 625
 626 /* queue an exception event */
 627 DECL_HANDLER(queue_exception_event)
 628 {
 629     reply->handle = 0;
 630     if (current->process->debugger)
 631     {
 632         struct debug_event_exception data;
 633         struct debug_event *event;
 634         const CONTEXT *context = get_req_data();
 635         const EXCEPTION_RECORD *rec = (const EXCEPTION_RECORD *)(context + 1);
 636
 637         if (get_req_data_size() < sizeof(*rec) + sizeof(*context))
 638         {
 639             set_error( STATUS_INVALID_PARAMETER );
 640             return;
 641         }
 642         data.record = *rec;
 643         data.first  = req->first;
 644         if ((event = alloc_debug_event( current, EXCEPTION_DEBUG_EVENT, &data, context )))
 645         {
 646             if ((reply->handle = alloc_handle( current->process, event, SYNCHRONIZE, 0 )))
 647             {
 648                 link_event( event );
 649                 suspend_process( current->process );
 650             }
 651             release_object( event );
 652         }
 653     }
 654 }
 655
 656 /* retrieve the status of an exception event */
 657 DECL_HANDLER(get_exception_status)
 658 {
 659     struct debug_event *event;
 660
 661     if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
 662                                                        0, &debug_event_ops )))
 663     {
 664         close_handle( current->process, req->handle );
 665         if (event->state == EVENT_CONTINUED)
 666         {
 667             if (current->context == &event->context)
 668             {
 669                 data_size_t size = min( sizeof(CONTEXT), get_reply_max_size() );
 670                 set_reply_data( &event->context, size );
 671                 current->context = NULL;
 672             }
 673             set_error( event->status );
 674         }
 675         else set_error( STATUS_PENDING );
 676         release_object( event );
 677     }
 678 }
 679
 680 /* send an output string to the debugger */
 681 DECL_HANDLER(output_debug_string)
 682 {
 683     struct debug_event_output_string data;
 684
 685     data.string  = req->string;
 686     data.unicode = req->unicode;
 687     data.length  = req->length;
 688     generate_debug_event( current, OUTPUT_DEBUG_STRING_EVENT, &data );
 689 }
 690
 691 /* simulate a breakpoint in a process */
 692 DECL_HANDLER(debug_break)
 693 {
 694     struct process *process;
 695
 696     reply->self = 0;
 697     if ((process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION /*FIXME*/ )))
 698     {
 699         if (process != current->process) break_process( process );
 700         else reply->self = 1;
 701         release_object( process );
 702     }
 703 }
 704
 705 /* set debugger kill on exit flag */
 706 DECL_HANDLER(set_debugger_kill_on_exit)
 707 {
 708     if (!current->debug_ctx)
 709     {
 710         set_error( STATUS_ACCESS_DENIED );
 711         return;
 712     }
 713     current->debug_ctx->kill_on_exit = req->kill_on_exit;
 714 }