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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 <stdio.h>
  28
  29 #include "winbase.h"
  30
  31 #include "handle.h"
  32 #include "process.h"
  33 #include "thread.h"
  34 #include "request.h"
  35 #include "console.h"
  36
  37 enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
  38
  39 /* debug event */
  40 struct debug_event
  41 {
  42     struct object          obj;       /* object header */
  43     struct debug_event    *next;      /* event queue */
  44     struct debug_event    *prev;
  45     struct thread         *sender;    /* thread which sent this event */
  46     struct thread         *debugger;  /* debugger thread receiving the event */
  47     enum debug_event_state state;     /* event state */
  48     int                    status;    /* continuation status */
  49     debug_event_t          data;      /* event data */
  50     CONTEXT                context;   /* register context */
  51 };
  52
  53 /* debug context */
  54 struct debug_ctx
  55 {
  56     struct object        obj;         /* object header */
  57     struct debug_event  *event_head;  /* head of pending events queue */
  58     struct debug_event  *event_tail;  /* tail of pending events queue */
  59     int                  kill_on_exit;/* kill debuggees on debugger exit ? */
  60 };
  61
  62
  63 static void debug_event_dump( struct object *obj, int verbose );
  64 static int debug_event_signaled( struct object *obj, struct thread *thread );
  65 static void debug_event_destroy( struct object *obj );
  66
  67 static const struct object_ops debug_event_ops =
  68 {
  69     sizeof(struct debug_event),    /* size */
  70     debug_event_dump,              /* dump */
  71     add_queue,                     /* add_queue */
  72     remove_queue,                  /* remove_queue */
  73     debug_event_signaled,          /* signaled */
  74     no_satisfied,                  /* satisfied */
  75     no_get_fd,                     /* get_fd */
  76     debug_event_destroy            /* destroy */
  77 };
  78
  79 static void debug_ctx_dump( struct object *obj, int verbose );
  80 static int debug_ctx_signaled( struct object *obj, struct thread *thread );
  81 static void debug_ctx_destroy( struct object *obj );
  82
  83 static const struct object_ops debug_ctx_ops =
  84 {
  85     sizeof(struct debug_ctx),      /* size */
  86     debug_ctx_dump,                /* dump */
  87     add_queue,                     /* add_queue */
  88     remove_queue,                  /* remove_queue */
  89     debug_ctx_signaled,            /* signaled */
  90     no_satisfied,                  /* satisfied */
  91     no_get_fd,                     /* get_fd */
  92     debug_ctx_destroy              /* destroy */
  93 };
  94
  95
  96 /* routines to build an event according to its type */
  97
  98 static int fill_exception_event( struct debug_event *event, void *arg )
  99 {
 100     memcpy( &event->data.info.exception, arg, sizeof(event->data.info.exception) );
 101     return 1;
 102 }
 103
 104 static int fill_create_thread_event( struct debug_event *event, void *arg )
 105 {
 106     struct process *debugger = event->debugger->process;
 107     struct thread *thread = event->sender;
 108     obj_handle_t handle;
 109
 110     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 111     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, FALSE ))) return 0;
 112     event->data.info.create_thread.handle = handle;
 113     event->data.info.create_thread.teb    = thread->teb;
 114     event->data.info.create_thread.start  = arg;
 115     return 1;
 116 }
 117
 118 static int fill_create_process_event( struct debug_event *event, void *arg )
 119 {
 120     struct process *debugger = event->debugger->process;
 121     struct thread *thread = event->sender;
 122     struct process *process = thread->process;
 123     obj_handle_t handle;
 124
 125     /* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
 126     if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, FALSE ))) return 0;
 127     event->data.info.create_process.process = handle;
 128
 129     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 130     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, FALSE )))
 131     {
 132         close_handle( debugger, event->data.info.create_process.process, NULL );
 133         return 0;
 134     }
 135     event->data.info.create_process.thread = handle;
 136
 137     handle = 0;
 138     if (process->exe.file &&
 139         /* the doc says write access too, but this doesn't seem a good idea */
 140         !(handle = alloc_handle( debugger, process->exe.file, GENERIC_READ, FALSE )))
 141     {
 142         close_handle( debugger, event->data.info.create_process.process, NULL );
 143         close_handle( debugger, event->data.info.create_process.thread, NULL );
 144         return 0;
 145     }
 146     event->data.info.create_process.file       = handle;
 147     event->data.info.create_process.teb        = thread->teb;
 148     event->data.info.create_process.base       = process->exe.base;
 149     event->data.info.create_process.start      = arg;
 150     event->data.info.create_process.dbg_offset = process->exe.dbg_offset;
 151     event->data.info.create_process.dbg_size   = process->exe.dbg_size;
 152     event->data.info.create_process.name       = process->exe.name;
 153     event->data.info.create_process.unicode    = 0;
 154     return 1;
 155 }
 156
 157 static int fill_exit_thread_event( struct debug_event *event, void *arg )
 158 {
 159     struct thread *thread = arg;
 160     event->data.info.exit.exit_code = thread->exit_code;
 161     return 1;
 162 }
 163
 164 static int fill_exit_process_event( struct debug_event *event, void *arg )
 165 {
 166     struct process *process = arg;
 167     event->data.info.exit.exit_code = process->exit_code;
 168     return 1;
 169 }
 170
 171 static int fill_load_dll_event( struct debug_event *event, void *arg )
 172 {
 173     struct process *debugger = event->debugger->process;
 174     struct process_dll *dll = arg;
 175     obj_handle_t handle = 0;
 176
 177     if (dll->file && !(handle = alloc_handle( debugger, dll->file, GENERIC_READ, FALSE )))
 178         return 0;
 179     event->data.info.load_dll.handle     = handle;
 180     event->data.info.load_dll.base       = dll->base;
 181     event->data.info.load_dll.dbg_offset = dll->dbg_offset;
 182     event->data.info.load_dll.dbg_size   = dll->dbg_size;
 183     event->data.info.load_dll.name       = dll->name;
 184     event->data.info.load_dll.unicode    = 0;
 185     return 1;
 186 }
 187
 188 static int fill_unload_dll_event( struct debug_event *event, void *arg )
 189 {
 190     event->data.info.unload_dll.base = arg;
 191     return 1;
 192 }
 193
 194 static int fill_output_debug_string_event( struct debug_event *event, void *arg )
 195 {
 196     struct debug_event_output_string *data = arg;
 197     event->data.info.output_string = *data;
 198     return 1;
 199 }
 200
 201 typedef int (*fill_event_func)( struct debug_event *event, void *arg );
 202
 203 #define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT  /* RIP_EVENT not supported */
 204
 205 static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
 206 {
 207     fill_exception_event,            /* EXCEPTION_DEBUG_EVENT */
 208     fill_create_thread_event,        /* CREATE_THREAD_DEBUG_EVENT */
 209     fill_create_process_event,       /* CREATE_PROCESS_DEBUG_EVENT */
 210     fill_exit_thread_event,          /* EXIT_THREAD_DEBUG_EVENT */
 211     fill_exit_process_event,         /* EXIT_PROCESS_DEBUG_EVENT */
 212     fill_load_dll_event,             /* LOAD_DLL_DEBUG_EVENT */
 213     fill_unload_dll_event,           /* UNLOAD_DLL_DEBUG_EVENT */
 214     fill_output_debug_string_event   /* OUTPUT_DEBUG_STRING_EVENT */
 215 };
 216
 217
 218 /* unlink the first event from the queue */
 219 static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
 220 {
 221     if (event->prev) event->prev->next = event->next;
 222     else debug_ctx->event_head = event->next;
 223     if (event->next) event->next->prev = event->prev;
 224     else debug_ctx->event_tail = event->prev;
 225     event->next = event->prev = NULL;
 226     if (event->sender->debug_event == event) event->sender->debug_event = NULL;
 227     release_object( event );
 228 }
 229
 230 /* link an event at the end of the queue */
 231 static void link_event( struct debug_event *event )
 232 {
 233     struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
 234
 235     assert( debug_ctx );
 236     grab_object( event );
 237     event->next = NULL;
 238     event->prev = debug_ctx->event_tail;
 239     debug_ctx->event_tail = event;
 240     if (event->prev) event->prev->next = event;
 241     else debug_ctx->event_head = event;
 242     if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
 243 }
 244
 245 /* find the next event that we can send to the debugger */
 246 static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
 247 {
 248     struct debug_event *event;
 249     for (event = debug_ctx->event_head; event; event = event->next)
 250     {
 251         if (event->state == EVENT_SENT) continue;  /* already sent */
 252         if (event->sender->debug_event) continue;  /* thread busy with another one */
 253         break;
 254     }
 255     return event;
 256 }
 257
 258 static void debug_event_dump( struct object *obj, int verbose )
 259 {
 260     struct debug_event *debug_event = (struct debug_event *)obj;
 261     assert( obj->ops == &debug_event_ops );
 262     fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
 263              debug_event->sender, debug_event->data.code, debug_event->state );
 264 }
 265
 266 static int debug_event_signaled( struct object *obj, struct thread *thread )
 267 {
 268     struct debug_event *debug_event = (struct debug_event *)obj;
 269     assert( obj->ops == &debug_event_ops );
 270     return debug_event->state == EVENT_CONTINUED;
 271 }
 272
 273 static void debug_event_destroy( struct object *obj )
 274 {
 275     struct debug_event *event = (struct debug_event *)obj;
 276     assert( obj->ops == &debug_event_ops );
 277
 278     /* cannot still be in the queue */
 279     assert( !event->next );
 280     assert( !event->prev );
 281
 282     /* If the event has been sent already, the handles are now under the */
 283     /* responsibility of the debugger process, so we don't touch them    */
 284     if (event->state == EVENT_QUEUED)
 285     {
 286         struct process *debugger = event->debugger->process;
 287         switch(event->data.code)
 288         {
 289         case CREATE_THREAD_DEBUG_EVENT:
 290             close_handle( debugger, event->data.info.create_thread.handle, NULL );
 291             break;
 292         case CREATE_PROCESS_DEBUG_EVENT:
 293             if (event->data.info.create_process.file)
 294                 close_handle( debugger, event->data.info.create_process.file, NULL );
 295             close_handle( debugger, event->data.info.create_process.thread, NULL );
 296             close_handle( debugger, event->data.info.create_process.process, NULL );
 297             break;
 298         case LOAD_DLL_DEBUG_EVENT:
 299             if (event->data.info.load_dll.handle)
 300                 close_handle( debugger, event->data.info.load_dll.handle, NULL );
 301             break;
 302         }
 303     }
 304     if (event->sender->context == &event->context) event->sender->context = NULL;
 305     release_object( event->sender );
 306     release_object( event->debugger );
 307 }
 308
 309 static void debug_ctx_dump( struct object *obj, int verbose )
 310 {
 311     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 312     assert( obj->ops == &debug_ctx_ops );
 313     fprintf( stderr, "Debug context head=%p tail=%p\n",
 314              debug_ctx->event_head, debug_ctx->event_tail );
 315 }
 316
 317 static int debug_ctx_signaled( struct object *obj, struct thread *thread )
 318 {
 319     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 320     assert( obj->ops == &debug_ctx_ops );
 321     return find_event_to_send( debug_ctx ) != NULL;
 322 }
 323
 324 static void debug_ctx_destroy( struct object *obj )
 325 {
 326     struct debug_event *event;
 327     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 328     assert( obj->ops == &debug_ctx_ops );
 329
 330     /* free all pending events */
 331     while ((event = debug_ctx->event_head) != NULL) unlink_event( debug_ctx, event );
 332 }
 333
 334 /* continue a debug event */
 335 static int continue_debug_event( struct process *process, struct thread *thread, int status )
 336 {
 337     struct debug_event *event;
 338     struct debug_ctx *debug_ctx = current->debug_ctx;
 339
 340     if (!debug_ctx || process->debugger != current || thread->process != process) goto error;
 341
 342     /* find the event in the queue */
 343     for (event = debug_ctx->event_head; event; event = event->next)
 344     {
 345         if (event->state != EVENT_SENT) continue;
 346         if (event->sender == thread) break;
 347     }
 348     if (!event) goto error;
 349
 350     assert( event->sender->debug_event == event );
 351
 352     event->status = status;
 353     event->state  = EVENT_CONTINUED;
 354     wake_up( &event->obj, 0 );
 355
 356     unlink_event( debug_ctx, event );
 357     resume_process( process );
 358     return 1;
 359  error:
 360     /* not debugging this process, or no such event */
 361     set_error( STATUS_ACCESS_DENIED );  /* FIXME */
 362     return 0;
 363 }
 364
 365 /* alloc a debug event for a debugger */
 366 static struct debug_event *alloc_debug_event( struct thread *thread, int code,
 367                                               void *arg, const CONTEXT *context )
 368 {
 369     struct thread *debugger = thread->process->debugger;
 370     struct debug_event *event;
 371
 372     assert( code > 0 && code <= NB_DEBUG_EVENTS );
 373     /* cannot queue a debug event for myself */
 374     assert( debugger->process != thread->process );
 375
 376     /* build the event */
 377     if (!(event = alloc_object( &debug_event_ops ))) return NULL;
 378     event->next      = NULL;
 379     event->prev      = NULL;
 380     event->state     = EVENT_QUEUED;
 381     event->sender    = (struct thread *)grab_object( thread );
 382     event->debugger  = (struct thread *)grab_object( debugger );
 383     event->data.code = code;
 384
 385     if (!fill_debug_event[code-1]( event, arg ))
 386     {
 387         event->data.code = -1;  /* make sure we don't attempt to close handles */
 388         release_object( event );
 389         return NULL;
 390     }
 391     if (context)
 392     {
 393         memcpy( &event->context, context, sizeof(event->context) );
 394         thread->context = &event->context;
 395     }
 396     return event;
 397 }
 398
 399 /* generate a debug event from inside the server and queue it */
 400 void generate_debug_event( struct thread *thread, int code, void *arg )
 401 {
 402     if (thread->process->debugger)
 403     {
 404         struct debug_event *event = alloc_debug_event( thread, code, arg, NULL );
 405         if (event)
 406         {
 407             link_event( event );
 408             suspend_process( thread->process );
 409             release_object( event );
 410         }
 411     }
 412 }
 413
 414 /* attach a process to a debugger thread and suspend it */
 415 static int debugger_attach( struct process *process, struct thread *debugger )
 416 {
 417     struct thread *thread;
 418
 419     if (process->debugger) goto error;  /* already being debugged */
 420     if (!is_process_init_done( process )) goto error;  /* still starting up */
 421     if (!process->thread_list) goto error;  /* no thread running in the process */
 422
 423     /* make sure we don't create a debugging loop */
 424     for (thread = debugger; thread; thread = thread->process->debugger)
 425         if (thread->process == process) goto error;
 426
 427     /* don't let a debugger debug its console... won't work */
 428     if (debugger->process->console && debugger->process->console->renderer->process == process)
 429         goto error;
 430
 431     suspend_process( process );
 432     if (!attach_process( process ) || !set_process_debugger( process, debugger ))
 433     {
 434         resume_process( process );
 435         return 0;
 436     }
 437     return 1;
 438
 439  error:
 440     set_error( STATUS_ACCESS_DENIED );
 441     return 0;
 442 }
 443
 444
 445 /* detach a process from a debugger thread (and resume it ?) */
 446 int debugger_detach( struct process *process, struct thread *debugger )
 447 {
 448     struct debug_event *event;
 449     struct debug_ctx *debug_ctx;
 450
 451     if (!process->debugger || process->debugger != debugger)
 452         goto error;  /* not currently debugged, or debugged by another debugger */
 453     if (!debugger->debug_ctx ) goto error; /* should be a debugger */
 454     /* init should be done, otherwise wouldn't be attached */
 455     assert(is_process_init_done(process));
 456
 457     suspend_process( process );
 458     /* send continue indication for all events */
 459     debug_ctx = debugger->debug_ctx;
 460
 461     /* find the event in the queue
 462      * FIXME: could loop on process' threads and look the debug_event field */
 463     for (event = debug_ctx->event_head; event; event = event->next)
 464     {
 465         if (event->state != EVENT_QUEUED) continue;
 466
 467         if (event->sender->process == process)
 468         {
 469             assert( event->sender->debug_event == event );
 470             event->status = DBG_CONTINUE;
 471             event->state  = EVENT_CONTINUED;
 472             wake_up( &event->obj, 0 );
 473             unlink_event( debug_ctx, event );
 474             /* from queued debug event */
 475             resume_process( process );
 476         }
 477     }
 478
 479     /* remove relationships between process and its debugger */
 480     process->debugger = NULL;
 481     release_object( debugger->debug_ctx );
 482     debugger->debug_ctx = NULL;
 483     detach_process( process );
 484
 485     /* from this function */
 486     resume_process( process );
 487     return 0;
 488
 489  error:
 490     set_error( STATUS_ACCESS_DENIED );
 491     return 0;
 492 }
 493
 494 /* generate all startup events of a given process */
 495 void generate_startup_debug_events( struct process *process, void *entry )
 496 {
 497     struct process_dll *dll;
 498     struct thread *thread = process->thread_list;
 499
 500     /* generate creation events */
 501     generate_debug_event( thread, CREATE_PROCESS_DEBUG_EVENT, entry );
 502     while ((thread = thread->proc_next))
 503         generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
 504
 505     /* generate dll events (in loading order, i.e. reverse list order) */
 506     dll = &process->exe;
 507     while (dll->next) dll = dll->next;
 508     while (dll != &process->exe)
 509     {
 510         generate_debug_event( process->thread_list, LOAD_DLL_DEBUG_EVENT, dll );
 511         dll = dll->prev;
 512     }
 513 }
 514
 515 /* set the debugger of a given process */
 516 int set_process_debugger( struct process *process, struct thread *debugger )
 517 {
 518     struct debug_ctx *debug_ctx;
 519
 520     assert( !process->debugger );
 521
 522     if (!debugger->debug_ctx)  /* need to allocate a context */
 523     {
 524         if (!(debug_ctx = alloc_object( &debug_ctx_ops ))) return 0;
 525         debug_ctx->event_head = NULL;
 526         debug_ctx->event_tail = NULL;
 527         debug_ctx->kill_on_exit = 1;
 528         debugger->debug_ctx = debug_ctx;
 529     }
 530     process->debugger = debugger;
 531     return 1;
 532 }
 533
 534 /* a thread is exiting */
 535 void debug_exit_thread( struct thread *thread )
 536 {
 537     if (thread->debug_ctx)  /* this thread is a debugger */
 538     {
 539         if (thread->debug_ctx->kill_on_exit)
 540         {
 541             /* kill all debugged processes */
 542             kill_debugged_processes( thread, thread->exit_code );
 543         }
 544         else
 545         {
 546             detach_debugged_processes( thread );
 547         }
 548         release_object( thread->debug_ctx );
 549         thread->debug_ctx = NULL;
 550     }
 551 }
 552
 553 /* Wait for a debug event */
 554 DECL_HANDLER(wait_debug_event)
 555 {
 556     struct debug_ctx *debug_ctx = current->debug_ctx;
 557     struct debug_event *event;
 558
 559     if (!debug_ctx)  /* current thread is not a debugger */
 560     {
 561         set_error( STATUS_INVALID_HANDLE );
 562         return;
 563     }
 564     reply->wait = 0;
 565     if ((event = find_event_to_send( debug_ctx )))
 566     {
 567         size_t size = get_reply_max_size();
 568         event->state = EVENT_SENT;
 569         event->sender->debug_event = event;
 570         reply->pid = get_process_id( event->sender->process );
 571         reply->tid = get_thread_id( event->sender );
 572         if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
 573         set_reply_data( &event->data, size );
 574     }
 575     else  /* no event ready */
 576     {
 577         reply->pid  = 0;
 578         reply->tid  = 0;
 579         if (req->get_handle)
 580             reply->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, FALSE );
 581     }
 582 }
 583
 584 /* Continue a debug event */
 585 DECL_HANDLER(continue_debug_event)
 586 {
 587     struct process *process = get_process_from_id( req->pid );
 588     if (process)
 589     {
 590         struct thread *thread = get_thread_from_id( req->tid );
 591         if (thread)
 592         {
 593             continue_debug_event( process, thread, req->status );
 594             release_object( thread );
 595         }
 596         release_object( process );
 597     }
 598 }
 599
 600 /* Start debugging an existing process */
 601 DECL_HANDLER(debug_process)
 602 {
 603     struct process *process = get_process_from_id( req->pid );
 604     if (!process) return;
 605
 606     if (!req->attach)
 607     {
 608         debugger_detach( process, current );
 609     }
 610     else if (debugger_attach( process, current ))
 611     {
 612         struct debug_event_exception data;
 613
 614         generate_startup_debug_events( process, NULL );
 615         resume_process( process );
 616
 617         data.record.ExceptionCode    = EXCEPTION_BREAKPOINT;
 618         data.record.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 619         data.record.ExceptionRecord  = NULL;
 620         data.record.ExceptionAddress = get_thread_ip( process->thread_list );
 621         data.record.NumberParameters = 0;
 622         data.first = 1;
 623         generate_debug_event( process->thread_list, EXCEPTION_DEBUG_EVENT, &data );
 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         EXCEPTION_RECORD *rec = (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, FALSE )))
 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     reply->status = 0;
 664     if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
 665                                                        0, &debug_event_ops )))
 666     {
 667         if (event->state == EVENT_CONTINUED)
 668         {
 669             reply->status = event->status;
 670             if (current->context == &event->context)
 671             {
 672                 size_t size = min( sizeof(CONTEXT), get_reply_max_size() );
 673                 set_reply_data( &event->context, size );
 674                 current->context = NULL;
 675             }
 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         return;
 701     if (process != current->process)
 702     {
 703         /* find a suitable thread to signal */
 704         struct thread *thread;
 705         for (thread = process->thread_list; thread; thread = thread->proc_next)
 706         {
 707             if (send_thread_signal( thread, SIGTRAP )) break;
 708         }
 709         if (!thread) set_error( STATUS_ACCESS_DENIED );
 710     }
 711     else reply->self = 1;
 712     release_object( process );
 713 }
 714
 715 /* set debugger kill on exit flag */
 716 DECL_HANDLER(set_debugger_kill_on_exit)
 717 {
 718     if (!current->debug_ctx)
 719     {
 720         set_error( STATUS_ACCESS_DENIED );
 721         return;
 722     }
 723     current->debug_ctx->kill_on_exit = req->kill_on_exit;
 724 }