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 #include "console.h"
  40
  41 enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
  42
  43 /* debug event */
  44 struct debug_event
  45 {
  46     struct object          obj;       /* object header */
  47     struct list            entry;     /* entry in event queue */
  48     struct thread         *sender;    /* thread which sent this event */
  49     struct thread         *debugger;  /* debugger thread receiving the event */
  50     enum debug_event_state state;     /* event state */
  51     int                    status;    /* continuation status */
  52     debug_event_t          data;      /* event data */
  53     CONTEXT                context;   /* register context */
  54 };
  55
  56 /* debug context */
  57 struct debug_ctx
  58 {
  59     struct object        obj;         /* object header */
  60     struct list          event_queue; /* pending events queue */
  61     int                  kill_on_exit;/* kill debuggees on debugger exit ? */
  62 };
  63
  64
  65 static void debug_event_dump( struct object *obj, int verbose );
  66 static int debug_event_signaled( struct object *obj, struct thread *thread );
  67 static void debug_event_destroy( struct object *obj );
  68
  69 static const struct object_ops debug_event_ops =
  70 {
  71     sizeof(struct debug_event),    /* size */
  72     debug_event_dump,              /* dump */
  73     add_queue,                     /* add_queue */
  74     remove_queue,                  /* remove_queue */
  75     debug_event_signaled,          /* signaled */
  76     no_satisfied,                  /* satisfied */
  77     no_signal,                     /* signal */
  78     no_get_fd,                     /* get_fd */
  79     no_map_access,                 /* map_access */
  80     no_lookup_name,                /* lookup_name */
  81     no_open_file,                  /* open_file */
  82     no_close_handle,               /* close_handle */
  83     debug_event_destroy            /* destroy */
  84 };
  85
  86 static void debug_ctx_dump( struct object *obj, int verbose );
  87 static int debug_ctx_signaled( struct object *obj, struct thread *thread );
  88 static void debug_ctx_destroy( struct object *obj );
  89
  90 static const struct object_ops debug_ctx_ops =
  91 {
  92     sizeof(struct debug_ctx),      /* size */
  93     debug_ctx_dump,                /* dump */
  94     add_queue,                     /* add_queue */
  95     remove_queue,                  /* remove_queue */
  96     debug_ctx_signaled,            /* signaled */
  97     no_satisfied,                  /* satisfied */
  98     no_signal,                     /* signal */
  99     no_get_fd,                     /* get_fd */
 100     no_map_access,                 /* map_access */
 101     no_lookup_name,                /* lookup_name */
 102     no_open_file,                  /* open_file */
 103     no_close_handle,               /* close_handle */
 104     debug_ctx_destroy              /* destroy */
 105 };
 106
 107
 108 /* routines to build an event according to its type */
 109
 110 static int fill_exception_event( struct debug_event *event, void *arg )
 111 {
 112     memcpy( &event->data.info.exception, arg, sizeof(event->data.info.exception) );
 113     return 1;
 114 }
 115
 116 static int fill_create_thread_event( struct debug_event *event, void *arg )
 117 {
 118     struct process *debugger = event->debugger->process;
 119     struct thread *thread = event->sender;
 120     obj_handle_t handle;
 121
 122     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 123     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 ))) return 0;
 124     event->data.info.create_thread.handle = handle;
 125     event->data.info.create_thread.teb    = thread->teb;
 126     event->data.info.create_thread.start  = arg;
 127     return 1;
 128 }
 129
 130 static int fill_create_process_event( struct debug_event *event, void *arg )
 131 {
 132     struct process *debugger = event->debugger->process;
 133     struct thread *thread = event->sender;
 134     struct process *process = thread->process;
 135     struct process_dll *exe_module = get_process_exe_module( process );
 136     obj_handle_t handle;
 137
 138     /* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
 139     if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, 0 ))) return 0;
 140     event->data.info.create_process.process = handle;
 141
 142     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 143     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 )))
 144     {
 145         close_handle( debugger, event->data.info.create_process.process );
 146         return 0;
 147     }
 148     event->data.info.create_process.thread = handle;
 149
 150     handle = 0;
 151     if (exe_module->file &&
 152         /* the doc says write access too, but this doesn't seem a good idea */
 153         !(handle = alloc_handle( debugger, exe_module->file, GENERIC_READ, 0 )))
 154     {
 155         close_handle( debugger, event->data.info.create_process.process );
 156         close_handle( debugger, event->data.info.create_process.thread );
 157         return 0;
 158     }
 159     event->data.info.create_process.file       = handle;
 160     event->data.info.create_process.teb        = thread->teb;
 161     event->data.info.create_process.base       = exe_module->base;
 162     event->data.info.create_process.start      = arg;
 163     event->data.info.create_process.dbg_offset = exe_module->dbg_offset;
 164     event->data.info.create_process.dbg_size   = exe_module->dbg_size;
 165     event->data.info.create_process.name       = exe_module->name;
 166     event->data.info.create_process.unicode    = 1;
 167     return 1;
 168 }
 169
 170 static int fill_exit_thread_event( struct debug_event *event, void *arg )
 171 {
 172     struct thread *thread = arg;
 173     event->data.info.exit.exit_code = thread->exit_code;
 174     return 1;
 175 }
 176
 177 static int fill_exit_process_event( struct debug_event *event, void *arg )
 178 {
 179     struct process *process = arg;
 180     event->data.info.exit.exit_code = process->exit_code;
 181     return 1;
 182 }
 183
 184 static int fill_load_dll_event( struct debug_event *event, void *arg )
 185 {
 186     struct process *debugger = event->debugger->process;
 187     struct process_dll *dll = arg;
 188     obj_handle_t handle = 0;
 189
 190     if (dll->file && !(handle = alloc_handle( debugger, dll->file, GENERIC_READ, 0 )))
 191         return 0;
 192     event->data.info.load_dll.handle     = handle;
 193     event->data.info.load_dll.base       = dll->base;
 194     event->data.info.load_dll.dbg_offset = dll->dbg_offset;
 195     event->data.info.load_dll.dbg_size   = dll->dbg_size;
 196     event->data.info.load_dll.name       = dll->name;
 197     event->data.info.load_dll.unicode    = 1;
 198     return 1;
 199 }
 200
 201 static int fill_unload_dll_event( struct debug_event *event, void *arg )
 202 {
 203     event->data.info.unload_dll.base = arg;
 204     return 1;
 205 }
 206
 207 static int fill_output_debug_string_event( struct debug_event *event, void *arg )
 208 {
 209     struct debug_event_output_string *data = arg;
 210     event->data.info.output_string = *data;
 211     return 1;
 212 }
 213
 214 typedef int (*fill_event_func)( struct debug_event *event, void *arg );
 215
 216 #define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT  /* RIP_EVENT not supported */
 217
 218 static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
 219 {
 220     fill_exception_event,            /* EXCEPTION_DEBUG_EVENT */
 221     fill_create_thread_event,        /* CREATE_THREAD_DEBUG_EVENT */
 222     fill_create_process_event,       /* CREATE_PROCESS_DEBUG_EVENT */
 223     fill_exit_thread_event,          /* EXIT_THREAD_DEBUG_EVENT */
 224     fill_exit_process_event,         /* EXIT_PROCESS_DEBUG_EVENT */
 225     fill_load_dll_event,             /* LOAD_DLL_DEBUG_EVENT */
 226     fill_unload_dll_event,           /* UNLOAD_DLL_DEBUG_EVENT */
 227     fill_output_debug_string_event   /* OUTPUT_DEBUG_STRING_EVENT */
 228 };
 229
 230
 231 /* unlink the first event from the queue */
 232 static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
 233 {
 234     list_remove( &event->entry );
 235     if (event->sender->debug_event == event) event->sender->debug_event = NULL;
 236     release_object( event );
 237 }
 238
 239 /* link an event at the end of the queue */
 240 static void link_event( struct debug_event *event )
 241 {
 242     struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
 243
 244     assert( debug_ctx );
 245     grab_object( event );
 246     list_add_tail( &debug_ctx->event_queue, &event->entry );
 247     if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
 248 }
 249
 250 /* find the next event that we can send to the debugger */
 251 static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
 252 {
 253     struct debug_event *event;
 254
 255     LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 256     {
 257         if (event->state == EVENT_SENT) continue;  /* already sent */
 258         if (event->sender->debug_event) continue;  /* thread busy with another one */
 259         return event;
 260     }
 261     return NULL;
 262 }
 263
 264 static void debug_event_dump( struct object *obj, int verbose )
 265 {
 266     struct debug_event *debug_event = (struct debug_event *)obj;
 267     assert( obj->ops == &debug_event_ops );
 268     fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
 269              debug_event->sender, debug_event->data.code, debug_event->state );
 270 }
 271
 272 static int debug_event_signaled( struct object *obj, struct thread *thread )
 273 {
 274     struct debug_event *debug_event = (struct debug_event *)obj;
 275     assert( obj->ops == &debug_event_ops );
 276     return debug_event->state == EVENT_CONTINUED;
 277 }
 278
 279 static void debug_event_destroy( struct object *obj )
 280 {
 281     struct debug_event *event = (struct debug_event *)obj;
 282     assert( obj->ops == &debug_event_ops );
 283
 284     /* If the event has been sent already, the handles are now under the */
 285     /* responsibility of the debugger process, so we don't touch them    */
 286     if (event->state == EVENT_QUEUED)
 287     {
 288         struct process *debugger = event->debugger->process;
 289         switch(event->data.code)
 290         {
 291         case CREATE_THREAD_DEBUG_EVENT:
 292             close_handle( debugger, event->data.info.create_thread.handle );
 293             break;
 294         case CREATE_PROCESS_DEBUG_EVENT:
 295             if (event->data.info.create_process.file)
 296                 close_handle( debugger, event->data.info.create_process.file );
 297             close_handle( debugger, event->data.info.create_process.thread );
 298             close_handle( debugger, event->data.info.create_process.process );
 299             break;
 300         case LOAD_DLL_DEBUG_EVENT:
 301             if (event->data.info.load_dll.handle)
 302                 close_handle( debugger, event->data.info.load_dll.handle );
 303             break;
 304         }
 305     }
 306     if (event->sender->context == &event->context) event->sender->context = NULL;
 307     release_object( event->sender );
 308     release_object( event->debugger );
 309 }
 310
 311 static void debug_ctx_dump( struct object *obj, int verbose )
 312 {
 313     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 314     assert( obj->ops == &debug_ctx_ops );
 315     fprintf( stderr, "Debug context head=%p tail=%p\n",
 316              debug_ctx->event_queue.next, debug_ctx->event_queue.prev );
 317 }
 318
 319 static int debug_ctx_signaled( struct object *obj, struct thread *thread )
 320 {
 321     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 322     assert( obj->ops == &debug_ctx_ops );
 323     return find_event_to_send( debug_ctx ) != NULL;
 324 }
 325
 326 static void debug_ctx_destroy( struct object *obj )
 327 {
 328     struct list *ptr;
 329     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 330     assert( obj->ops == &debug_ctx_ops );
 331
 332     /* free all pending events */
 333     while ((ptr = list_head( &debug_ctx->event_queue )))
 334         unlink_event( debug_ctx, LIST_ENTRY( ptr, struct debug_event, entry ));
 335 }
 336
 337 /* continue a debug event */
 338 static int continue_debug_event( struct process *process, struct thread *thread, int status )
 339 {
 340     struct debug_ctx *debug_ctx = current->debug_ctx;
 341
 342     if (debug_ctx && process->debugger == current && thread->process == process)
 343     {
 344         struct debug_event *event;
 345
 346         /* find the event in the queue */
 347         LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 348         {
 349             if (event->state != EVENT_SENT) continue;
 350             if (event->sender == thread)
 351             {
 352                 assert( event->sender->debug_event == event );
 353
 354                 event->status = status;
 355                 event->state  = EVENT_CONTINUED;
 356                 wake_up( &event->obj, 0 );
 357                 unlink_event( debug_ctx, event );
 358                 resume_process( process );
 359                 return 1;
 360             }
 361         }
 362     }
 363     /* not debugging this process, or no such event */
 364     set_error( STATUS_ACCESS_DENIED );  /* FIXME */
 365     return 0;
 366 }
 367
 368 /* alloc a debug event for a debugger */
 369 static struct debug_event *alloc_debug_event( struct thread *thread, int code,
 370                                               void *arg, const CONTEXT *context )
 371 {
 372     struct thread *debugger = thread->process->debugger;
 373     struct debug_event *event;
 374
 375     assert( code > 0 && code <= NB_DEBUG_EVENTS );
 376     /* cannot queue a debug event for myself */
 377     assert( debugger->process != thread->process );
 378
 379     /* build the event */
 380     if (!(event = alloc_object( &debug_event_ops ))) return NULL;
 381     event->state     = EVENT_QUEUED;
 382     event->sender    = (struct thread *)grab_object( thread );
 383     event->debugger  = (struct thread *)grab_object( debugger );
 384     event->data.code = code;
 385
 386     if (!fill_debug_event[code-1]( event, arg ))
 387     {
 388         event->data.code = -1;  /* make sure we don't attempt to close handles */
 389         release_object( event );
 390         return NULL;
 391     }
 392     if (context)
 393     {
 394         memcpy( &event->context, context, sizeof(event->context) );
 395         thread->context = &event->context;
 396     }
 397     return event;
 398 }
 399
 400 /* generate a debug event from inside the server and queue it */
 401 void generate_debug_event( struct thread *thread, int code, void *arg )
 402 {
 403     if (thread->process->debugger)
 404     {
 405         struct debug_event *event = alloc_debug_event( thread, code, arg, NULL );
 406         if (event)
 407         {
 408             link_event( event );
 409             suspend_process( thread->process );
 410             release_object( event );
 411         }
 412     }
 413 }
 414
 415 /* attach a process to a debugger thread and suspend it */
 416 static int debugger_attach( struct process *process, struct thread *debugger )
 417 {
 418     struct thread *thread;
 419
 420     if (process->debugger) goto error;  /* already being debugged */
 421     if (!is_process_init_done( process )) goto error;  /* still starting up */
 422     if (list_empty( &process->thread_list )) goto error;  /* no thread running in the process */
 423
 424     /* make sure we don't create a debugging loop */
 425     for (thread = debugger; thread; thread = thread->process->debugger)
 426         if (thread->process == process) goto error;
 427
 428     /* don't let a debugger debug its console... won't work */
 429     if (debugger->process->console && debugger->process->console->renderer->process == process)
 430         goto error;
 431
 432     suspend_process( process );
 433     if (!set_process_debugger( process, debugger ))
 434     {
 435         resume_process( process );
 436         return 0;
 437     }
 438     if (!set_process_debug_flag( process, 1 ))
 439     {
 440         process->debugger = NULL;
 441         resume_process( process );
 442         return 0;
 443     }
 444     return 1;
 445
 446  error:
 447     set_error( STATUS_ACCESS_DENIED );
 448     return 0;
 449 }
 450
 451
 452 /* detach a process from a debugger thread (and resume it ?) */
 453 int debugger_detach( struct process *process, struct thread *debugger )
 454 {
 455     struct debug_event *event;
 456     struct debug_ctx *debug_ctx;
 457
 458     if (!process->debugger || process->debugger != debugger)
 459         goto error;  /* not currently debugged, or debugged by another debugger */
 460     if (!debugger->debug_ctx ) goto error; /* should be a debugger */
 461     /* init should be done, otherwise wouldn't be attached */
 462     assert(is_process_init_done(process));
 463
 464     suspend_process( process );
 465     /* send continue indication for all events */
 466     debug_ctx = debugger->debug_ctx;
 467
 468     /* find the event in the queue
 469      * FIXME: could loop on process' threads and look the debug_event field */
 470     LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 471     {
 472         if (event->state != EVENT_QUEUED) continue;
 473
 474         if (event->sender->process == process)
 475         {
 476             assert( event->sender->debug_event == event );
 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             break;
 484         }
 485     }
 486
 487     /* remove relationships between process and its debugger */
 488     process->debugger = NULL;
 489     if (!set_process_debug_flag( process, 0 )) clear_error();  /* ignore error */
 490
 491     /* from this function */
 492     resume_process( process );
 493     return 0;
 494
 495  error:
 496     set_error( STATUS_ACCESS_DENIED );
 497     return 0;
 498 }
 499
 500 /* generate all startup events of a given process */
 501 void generate_startup_debug_events( struct process *process, void *entry )
 502 {
 503     struct list *ptr;
 504     struct thread *thread, *first_thread = get_process_first_thread( process );
 505
 506     /* generate creation events */
 507     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 508     {
 509         if (thread == first_thread)
 510             generate_debug_event( thread, CREATE_PROCESS_DEBUG_EVENT, entry );
 511         else
 512             generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
 513     }
 514
 515     /* generate dll events (in loading order, i.e. reverse list order) */
 516     ptr = list_tail( &process->dlls );
 517     while (ptr)
 518     {
 519         struct process_dll *dll = LIST_ENTRY( ptr, struct process_dll, entry );
 520         generate_debug_event( first_thread, LOAD_DLL_DEBUG_EVENT, dll );
 521         ptr = list_prev( &process->dlls, ptr );
 522     }
 523 }
 524
 525 /* set the debugger of a given process */
 526 int set_process_debugger( struct process *process, struct thread *debugger )
 527 {
 528     struct debug_ctx *debug_ctx;
 529
 530     assert( !process->debugger );
 531
 532     if (!debugger->debug_ctx)  /* need to allocate a context */
 533     {
 534         if (!(debug_ctx = alloc_object( &debug_ctx_ops ))) return 0;
 535         debug_ctx->kill_on_exit = 1;
 536         list_init( &debug_ctx->event_queue );
 537         debugger->debug_ctx = debug_ctx;
 538     }
 539     process->debugger = debugger;
 540     return 1;
 541 }
 542
 543 /* a thread is exiting */
 544 void debug_exit_thread( struct thread *thread )
 545 {
 546     if (thread->debug_ctx)  /* this thread is a debugger */
 547     {
 548         if (thread->debug_ctx->kill_on_exit)
 549         {
 550             /* kill all debugged processes */
 551             kill_debugged_processes( thread, thread->exit_code );
 552         }
 553         else
 554         {
 555             detach_debugged_processes( thread );
 556         }
 557         release_object( thread->debug_ctx );
 558         thread->debug_ctx = NULL;
 559     }
 560 }
 561
 562 /* Wait for a debug event */
 563 DECL_HANDLER(wait_debug_event)
 564 {
 565     struct debug_ctx *debug_ctx = current->debug_ctx;
 566     struct debug_event *event;
 567
 568     if (!debug_ctx)  /* current thread is not a debugger */
 569     {
 570         set_error( STATUS_INVALID_HANDLE );
 571         return;
 572     }
 573     reply->wait = 0;
 574     if ((event = find_event_to_send( debug_ctx )))
 575     {
 576         data_size_t size = get_reply_max_size();
 577         event->state = EVENT_SENT;
 578         event->sender->debug_event = event;
 579         reply->pid = get_process_id( event->sender->process );
 580         reply->tid = get_thread_id( event->sender );
 581         if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
 582         set_reply_data( &event->data, size );
 583     }
 584     else  /* no event ready */
 585     {
 586         reply->pid  = 0;
 587         reply->tid  = 0;
 588         if (req->get_handle)
 589             reply->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, 0 );
 590     }
 591 }
 592
 593 /* Continue a debug event */
 594 DECL_HANDLER(continue_debug_event)
 595 {
 596     struct process *process = get_process_from_id( req->pid );
 597     if (process)
 598     {
 599         struct thread *thread = get_thread_from_id( req->tid );
 600         if (thread)
 601         {
 602             continue_debug_event( process, thread, req->status );
 603             release_object( thread );
 604         }
 605         release_object( process );
 606     }
 607 }
 608
 609 /* Start debugging an existing process */
 610 DECL_HANDLER(debug_process)
 611 {
 612     struct process *process = get_process_from_id( req->pid );
 613     if (!process) return;
 614
 615     if (!req->attach)
 616     {
 617         debugger_detach( process, current );
 618     }
 619     else if (debugger_attach( process, current ))
 620     {
 621         generate_startup_debug_events( process, NULL );
 622         break_process( process );
 623         resume_process( process );
 624     }
 625     release_object( process );
 626 }
 627
 628 /* queue an exception event */
 629 DECL_HANDLER(queue_exception_event)
 630 {
 631     reply->handle = 0;
 632     if (current->process->debugger)
 633     {
 634         struct debug_event_exception data;
 635         struct debug_event *event;
 636         const CONTEXT *context = get_req_data();
 637         const EXCEPTION_RECORD *rec = (const EXCEPTION_RECORD *)(context + 1);
 638
 639         if (get_req_data_size() < sizeof(*rec) + sizeof(*context))
 640         {
 641             set_error( STATUS_INVALID_PARAMETER );
 642             return;
 643         }
 644         data.record = *rec;
 645         data.first  = req->first;
 646         if ((event = alloc_debug_event( current, EXCEPTION_DEBUG_EVENT, &data, context )))
 647         {
 648             if ((reply->handle = alloc_handle( current->process, event, SYNCHRONIZE, 0 )))
 649             {
 650                 link_event( event );
 651                 suspend_process( current->process );
 652             }
 653             release_object( event );
 654         }
 655     }
 656 }
 657
 658 /* retrieve the status of an exception event */
 659 DECL_HANDLER(get_exception_status)
 660 {
 661     struct debug_event *event;
 662
 663     if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
 664                                                        0, &debug_event_ops )))
 665     {
 666         close_handle( current->process, req->handle );
 667         if (event->state == EVENT_CONTINUED)
 668         {
 669             if (current->context == &event->context)
 670             {
 671                 data_size_t size = min( sizeof(CONTEXT), get_reply_max_size() );
 672                 set_reply_data( &event->context, size );
 673                 current->context = NULL;
 674             }
 675             set_error( event->status );
 676         }
 677         else set_error( STATUS_PENDING );
 678         release_object( event );
 679     }
 680 }
 681
 682 /* send an output string to the debugger */
 683 DECL_HANDLER(output_debug_string)
 684 {
 685     struct debug_event_output_string data;
 686
 687     data.string  = req->string;
 688     data.unicode = req->unicode;
 689     data.length  = req->length;
 690     generate_debug_event( current, OUTPUT_DEBUG_STRING_EVENT, &data );
 691 }
 692
 693 /* simulate a breakpoint in a process */
 694 DECL_HANDLER(debug_break)
 695 {
 696     struct process *process;
 697
 698     reply->self = 0;
 699     if ((process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION /*FIXME*/ )))
 700     {
 701         if (process != current->process) break_process( process );
 702         else reply->self = 1;
 703         release_object( process );
 704     }
 705 }
 706
 707 /* set debugger kill on exit flag */
 708 DECL_HANDLER(set_debugger_kill_on_exit)
 709 {
 710     if (!current->debug_ctx)
 711     {
 712         set_error( STATUS_ACCESS_DENIED );
 713         return;
 714     }
 715     current->debug_ctx->kill_on_exit = req->kill_on_exit;
 716 }