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     no_get_type,                   /* get_type */
  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     default_get_sd,                /* get_sd */
  81     default_set_sd,                /* set_sd */
  82     no_lookup_name,                /* lookup_name */
  83     no_open_file,                  /* open_file */
  84     no_close_handle,               /* close_handle */
  85     debug_event_destroy            /* destroy */
  86 };
  87
  88 static void debug_ctx_dump( struct object *obj, int verbose );
  89 static int debug_ctx_signaled( struct object *obj, struct thread *thread );
  90 static void debug_ctx_destroy( struct object *obj );
  91
  92 static const struct object_ops debug_ctx_ops =
  93 {
  94     sizeof(struct debug_ctx),      /* size */
  95     debug_ctx_dump,                /* dump */
  96     no_get_type,                   /* get_type */
  97     add_queue,                     /* add_queue */
  98     remove_queue,                  /* remove_queue */
  99     debug_ctx_signaled,            /* signaled */
 100     no_satisfied,                  /* satisfied */
 101     no_signal,                     /* signal */
 102     no_get_fd,                     /* get_fd */
 103     no_map_access,                 /* map_access */
 104     default_get_sd,                /* get_sd */
 105     default_set_sd,                /* set_sd */
 106     no_lookup_name,                /* lookup_name */
 107     no_open_file,                  /* open_file */
 108     no_close_handle,               /* close_handle */
 109     debug_ctx_destroy              /* destroy */
 110 };
 111
 112
 113 /* routines to build an event according to its type */
 114
 115 static int fill_exception_event( struct debug_event *event, void *arg )
 116 {
 117     memcpy( &event->data.info.exception, arg, sizeof(event->data.info.exception) );
 118     return 1;
 119 }
 120
 121 static int fill_create_thread_event( struct debug_event *event, void *arg )
 122 {
 123     struct process *debugger = event->debugger->process;
 124     struct thread *thread = event->sender;
 125     obj_handle_t handle;
 126
 127     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 128     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 ))) return 0;
 129     event->data.info.create_thread.handle = handle;
 130     event->data.info.create_thread.teb    = thread->teb;
 131     event->data.info.create_thread.start  = arg;
 132     return 1;
 133 }
 134
 135 static int fill_create_process_event( struct debug_event *event, void *arg )
 136 {
 137     struct process *debugger = event->debugger->process;
 138     struct thread *thread = event->sender;
 139     struct process *process = thread->process;
 140     struct process_dll *exe_module = get_process_exe_module( process );
 141     obj_handle_t handle;
 142
 143     /* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
 144     if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, 0 ))) return 0;
 145     event->data.info.create_process.process = handle;
 146
 147     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 148     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 )))
 149     {
 150         close_handle( debugger, event->data.info.create_process.process );
 151         return 0;
 152     }
 153     event->data.info.create_process.thread = handle;
 154
 155     handle = 0;
 156     if (exe_module->file &&
 157         /* the doc says write access too, but this doesn't seem a good idea */
 158         !(handle = alloc_handle( debugger, exe_module->file, GENERIC_READ, 0 )))
 159     {
 160         close_handle( debugger, event->data.info.create_process.process );
 161         close_handle( debugger, event->data.info.create_process.thread );
 162         return 0;
 163     }
 164     event->data.info.create_process.file       = handle;
 165     event->data.info.create_process.teb        = thread->teb;
 166     event->data.info.create_process.base       = exe_module->base;
 167     event->data.info.create_process.start      = arg;
 168     event->data.info.create_process.dbg_offset = exe_module->dbg_offset;
 169     event->data.info.create_process.dbg_size   = exe_module->dbg_size;
 170     event->data.info.create_process.name       = exe_module->name;
 171     event->data.info.create_process.unicode    = 1;
 172     return 1;
 173 }
 174
 175 static int fill_exit_thread_event( struct debug_event *event, void *arg )
 176 {
 177     struct thread *thread = arg;
 178     event->data.info.exit.exit_code = thread->exit_code;
 179     return 1;
 180 }
 181
 182 static int fill_exit_process_event( struct debug_event *event, void *arg )
 183 {
 184     struct process *process = arg;
 185     event->data.info.exit.exit_code = process->exit_code;
 186     return 1;
 187 }
 188
 189 static int fill_load_dll_event( struct debug_event *event, void *arg )
 190 {
 191     struct process *debugger = event->debugger->process;
 192     struct process_dll *dll = arg;
 193     obj_handle_t handle = 0;
 194
 195     if (dll->file && !(handle = alloc_handle( debugger, dll->file, GENERIC_READ, 0 )))
 196         return 0;
 197     event->data.info.load_dll.handle     = handle;
 198     event->data.info.load_dll.base       = dll->base;
 199     event->data.info.load_dll.dbg_offset = dll->dbg_offset;
 200     event->data.info.load_dll.dbg_size   = dll->dbg_size;
 201     event->data.info.load_dll.name       = dll->name;
 202     event->data.info.load_dll.unicode    = 1;
 203     return 1;
 204 }
 205
 206 static int fill_unload_dll_event( struct debug_event *event, void *arg )
 207 {
 208     mod_handle_t *base = arg;
 209     event->data.info.unload_dll.base = *base;
 210     return 1;
 211 }
 212
 213 static int fill_output_debug_string_event( struct debug_event *event, void *arg )
 214 {
 215     struct debug_event_output_string *data = arg;
 216     event->data.info.output_string = *data;
 217     return 1;
 218 }
 219
 220 typedef int (*fill_event_func)( struct debug_event *event, void *arg );
 221
 222 #define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT  /* RIP_EVENT not supported */
 223
 224 static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
 225 {
 226     fill_exception_event,            /* EXCEPTION_DEBUG_EVENT */
 227     fill_create_thread_event,        /* CREATE_THREAD_DEBUG_EVENT */
 228     fill_create_process_event,       /* CREATE_PROCESS_DEBUG_EVENT */
 229     fill_exit_thread_event,          /* EXIT_THREAD_DEBUG_EVENT */
 230     fill_exit_process_event,         /* EXIT_PROCESS_DEBUG_EVENT */
 231     fill_load_dll_event,             /* LOAD_DLL_DEBUG_EVENT */
 232     fill_unload_dll_event,           /* UNLOAD_DLL_DEBUG_EVENT */
 233     fill_output_debug_string_event   /* OUTPUT_DEBUG_STRING_EVENT */
 234 };
 235
 236
 237 /* unlink the first event from the queue */
 238 static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
 239 {
 240     list_remove( &event->entry );
 241     if (event->sender->debug_event == event) event->sender->debug_event = NULL;
 242     release_object( event );
 243 }
 244
 245 /* link an event at the end of the queue */
 246 static void link_event( struct debug_event *event )
 247 {
 248     struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
 249
 250     assert( debug_ctx );
 251     grab_object( event );
 252     list_add_tail( &debug_ctx->event_queue, &event->entry );
 253     if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
 254 }
 255
 256 /* find the next event that we can send to the debugger */
 257 static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
 258 {
 259     struct debug_event *event;
 260
 261     LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 262     {
 263         if (event->state == EVENT_SENT) continue;  /* already sent */
 264         if (event->sender->debug_event) continue;  /* thread busy with another one */
 265         return event;
 266     }
 267     return NULL;
 268 }
 269
 270 static void debug_event_dump( struct object *obj, int verbose )
 271 {
 272     struct debug_event *debug_event = (struct debug_event *)obj;
 273     assert( obj->ops == &debug_event_ops );
 274     fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
 275              debug_event->sender, debug_event->data.code, debug_event->state );
 276 }
 277
 278 static int debug_event_signaled( struct object *obj, struct thread *thread )
 279 {
 280     struct debug_event *debug_event = (struct debug_event *)obj;
 281     assert( obj->ops == &debug_event_ops );
 282     return debug_event->state == EVENT_CONTINUED;
 283 }
 284
 285 static void debug_event_destroy( struct object *obj )
 286 {
 287     struct debug_event *event = (struct debug_event *)obj;
 288     assert( obj->ops == &debug_event_ops );
 289
 290     /* If the event has been sent already, the handles are now under the */
 291     /* responsibility of the debugger process, so we don't touch them    */
 292     if (event->state == EVENT_QUEUED)
 293     {
 294         struct process *debugger = event->debugger->process;
 295         switch(event->data.code)
 296         {
 297         case CREATE_THREAD_DEBUG_EVENT:
 298             close_handle( debugger, event->data.info.create_thread.handle );
 299             break;
 300         case CREATE_PROCESS_DEBUG_EVENT:
 301             if (event->data.info.create_process.file)
 302                 close_handle( debugger, event->data.info.create_process.file );
 303             close_handle( debugger, event->data.info.create_process.thread );
 304             close_handle( debugger, event->data.info.create_process.process );
 305             break;
 306         case LOAD_DLL_DEBUG_EVENT:
 307             if (event->data.info.load_dll.handle)
 308                 close_handle( debugger, event->data.info.load_dll.handle );
 309             break;
 310         }
 311     }
 312     if (event->sender->context == &event->context) event->sender->context = NULL;
 313     release_object( event->sender );
 314     release_object( event->debugger );
 315 }
 316
 317 static void debug_ctx_dump( struct object *obj, int verbose )
 318 {
 319     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 320     assert( obj->ops == &debug_ctx_ops );
 321     fprintf( stderr, "Debug context head=%p tail=%p\n",
 322              debug_ctx->event_queue.next, debug_ctx->event_queue.prev );
 323 }
 324
 325 static int debug_ctx_signaled( struct object *obj, struct thread *thread )
 326 {
 327     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 328     assert( obj->ops == &debug_ctx_ops );
 329     return find_event_to_send( debug_ctx ) != NULL;
 330 }
 331
 332 static void debug_ctx_destroy( struct object *obj )
 333 {
 334     struct list *ptr;
 335     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 336     assert( obj->ops == &debug_ctx_ops );
 337
 338     /* free all pending events */
 339     while ((ptr = list_head( &debug_ctx->event_queue )))
 340         unlink_event( debug_ctx, LIST_ENTRY( ptr, struct debug_event, entry ));
 341 }
 342
 343 /* continue a debug event */
 344 static int continue_debug_event( struct process *process, struct thread *thread, int status )
 345 {
 346     struct debug_ctx *debug_ctx = current->debug_ctx;
 347
 348     if (debug_ctx && process->debugger == current && thread->process == process)
 349     {
 350         struct debug_event *event;
 351
 352         /* find the event in the queue */
 353         LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 354         {
 355             if (event->state != EVENT_SENT) continue;
 356             if (event->sender == thread)
 357             {
 358                 assert( event->sender->debug_event == event );
 359
 360                 event->status = status;
 361                 event->state  = EVENT_CONTINUED;
 362                 wake_up( &event->obj, 0 );
 363                 unlink_event( debug_ctx, event );
 364                 resume_process( process );
 365                 return 1;
 366             }
 367         }
 368     }
 369     /* not debugging this process, or no such event */
 370     set_error( STATUS_ACCESS_DENIED );  /* FIXME */
 371     return 0;
 372 }
 373
 374 /* alloc a debug event for a debugger */
 375 static struct debug_event *alloc_debug_event( struct thread *thread, int code,
 376                                               void *arg, const CONTEXT *context )
 377 {
 378     struct thread *debugger = thread->process->debugger;
 379     struct debug_event *event;
 380
 381     assert( code > 0 && code <= NB_DEBUG_EVENTS );
 382     /* cannot queue a debug event for myself */
 383     assert( debugger->process != thread->process );
 384
 385     /* build the event */
 386     if (!(event = alloc_object( &debug_event_ops ))) return NULL;
 387     event->state     = EVENT_QUEUED;
 388     event->sender    = (struct thread *)grab_object( thread );
 389     event->debugger  = (struct thread *)grab_object( debugger );
 390     event->data.code = code;
 391
 392     if (!fill_debug_event[code-1]( event, arg ))
 393     {
 394         event->data.code = -1;  /* make sure we don't attempt to close handles */
 395         release_object( event );
 396         return NULL;
 397     }
 398     if (context)
 399     {
 400         memcpy( &event->context, context, sizeof(event->context) );
 401         thread->context = &event->context;
 402     }
 403     return event;
 404 }
 405
 406 /* generate a debug event from inside the server and queue it */
 407 void generate_debug_event( struct thread *thread, int code, void *arg )
 408 {
 409     if (thread->process->debugger)
 410     {
 411         struct debug_event *event = alloc_debug_event( thread, code, arg, NULL );
 412         if (event)
 413         {
 414             link_event( event );
 415             suspend_process( thread->process );
 416             release_object( event );
 417         }
 418     }
 419 }
 420
 421 /* attach a process to a debugger thread and suspend it */
 422 static int debugger_attach( struct process *process, struct thread *debugger )
 423 {
 424     struct thread *thread;
 425
 426     if (process->debugger) goto error;  /* already being debugged */
 427     if (!is_process_init_done( process )) goto error;  /* still starting up */
 428     if (list_empty( &process->thread_list )) goto error;  /* no thread running in the process */
 429
 430     /* make sure we don't create a debugging loop */
 431     for (thread = debugger; thread; thread = thread->process->debugger)
 432         if (thread->process == process) goto error;
 433
 434     /* don't let a debugger debug its console... won't work */
 435     if (debugger->process->console && console_get_renderer(debugger->process->console)->process == process)
 436         goto error;
 437
 438     suspend_process( process );
 439     if (!set_process_debugger( process, debugger ))
 440     {
 441         resume_process( process );
 442         return 0;
 443     }
 444     if (!set_process_debug_flag( process, 1 ))
 445     {
 446         process->debugger = NULL;
 447         resume_process( process );
 448         return 0;
 449     }
 450     return 1;
 451
 452  error:
 453     set_error( STATUS_ACCESS_DENIED );
 454     return 0;
 455 }
 456
 457
 458 /* detach a process from a debugger thread (and resume it ?) */
 459 int debugger_detach( struct process *process, struct thread *debugger )
 460 {
 461     struct debug_event *event, *next;
 462     struct debug_ctx *debug_ctx;
 463
 464     if (!process->debugger || process->debugger != debugger)
 465         goto error;  /* not currently debugged, or debugged by another debugger */
 466     if (!debugger->debug_ctx ) goto error; /* should be a debugger */
 467     /* init should be done, otherwise wouldn't be attached */
 468     assert(is_process_init_done(process));
 469
 470     suspend_process( process );
 471     /* send continue indication for all events */
 472     debug_ctx = debugger->debug_ctx;
 473
 474     /* free all events from this process */
 475     LIST_FOR_EACH_ENTRY_SAFE( event, next, &debug_ctx->event_queue, struct debug_event, entry )
 476     {
 477         if (event->sender->process != process) continue;
 478
 479         assert( event->state != EVENT_CONTINUED );
 480         event->status = DBG_CONTINUE;
 481         event->state  = EVENT_CONTINUED;
 482         wake_up( &event->obj, 0 );
 483         unlink_event( debug_ctx, event );
 484         /* from queued debug event */
 485         resume_process( process );
 486     }
 487
 488     /* remove relationships between process and its debugger */
 489     process->debugger = NULL;
 490     if (!set_process_debug_flag( process, 0 )) clear_error();  /* ignore error */
 491
 492     /* from this function */
 493     resume_process( process );
 494     return 0;
 495
 496  error:
 497     set_error( STATUS_ACCESS_DENIED );
 498     return 0;
 499 }
 500
 501 /* generate all startup events of a given process */
 502 void generate_startup_debug_events( struct process *process, void *entry )
 503 {
 504     struct list *ptr;
 505     struct thread *thread, *first_thread = get_process_first_thread( process );
 506
 507     /* generate creation events */
 508     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 509     {
 510         if (thread == first_thread)
 511             generate_debug_event( thread, CREATE_PROCESS_DEBUG_EVENT, entry );
 512         else
 513             generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
 514     }
 515
 516     /* generate dll events (in loading order, i.e. reverse list order) */
 517     ptr = list_tail( &process->dlls );
 518     while (ptr)
 519     {
 520         struct process_dll *dll = LIST_ENTRY( ptr, struct process_dll, entry );
 521         generate_debug_event( first_thread, LOAD_DLL_DEBUG_EVENT, dll );
 522         ptr = list_prev( &process->dlls, ptr );
 523     }
 524 }
 525
 526 /* set the debugger of a given process */
 527 int set_process_debugger( struct process *process, struct thread *debugger )
 528 {
 529     struct debug_ctx *debug_ctx;
 530
 531     assert( !process->debugger );
 532
 533     if (!debugger->debug_ctx)  /* need to allocate a context */
 534     {
 535         if (!(debug_ctx = alloc_object( &debug_ctx_ops ))) return 0;
 536         debug_ctx->kill_on_exit = 1;
 537         list_init( &debug_ctx->event_queue );
 538         debugger->debug_ctx = debug_ctx;
 539     }
 540     process->debugger = debugger;
 541     return 1;
 542 }
 543
 544 /* a thread is exiting */
 545 void debug_exit_thread( struct thread *thread )
 546 {
 547     if (thread->debug_ctx)  /* this thread is a debugger */
 548     {
 549         if (thread->debug_ctx->kill_on_exit)
 550         {
 551             /* kill all debugged processes */
 552             kill_debugged_processes( thread, STATUS_DEBUGGER_INACTIVE );
 553         }
 554         else
 555         {
 556             detach_debugged_processes( thread );
 557         }
 558         release_object( thread->debug_ctx );
 559         thread->debug_ctx = NULL;
 560     }
 561 }
 562
 563 /* Wait for a debug event */
 564 DECL_HANDLER(wait_debug_event)
 565 {
 566     struct debug_ctx *debug_ctx = current->debug_ctx;
 567     struct debug_event *event;
 568
 569     if (!debug_ctx)  /* current thread is not a debugger */
 570     {
 571         set_error( STATUS_INVALID_HANDLE );
 572         return;
 573     }
 574     reply->wait = 0;
 575     if ((event = find_event_to_send( debug_ctx )))
 576     {
 577         data_size_t size = get_reply_max_size();
 578         event->state = EVENT_SENT;
 579         event->sender->debug_event = event;
 580         reply->pid = get_process_id( event->sender->process );
 581         reply->tid = get_thread_id( event->sender );
 582         if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
 583         set_reply_data( &event->data, size );
 584     }
 585     else  /* no event ready */
 586     {
 587         reply->pid  = 0;
 588         reply->tid  = 0;
 589         if (req->get_handle)
 590             reply->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, 0 );
 591     }
 592 }
 593
 594 /* Continue a debug event */
 595 DECL_HANDLER(continue_debug_event)
 596 {
 597     struct process *process = get_process_from_id( req->pid );
 598     if (process)
 599     {
 600         struct thread *thread = get_thread_from_id( req->tid );
 601         if (thread)
 602         {
 603             continue_debug_event( process, thread, req->status );
 604             release_object( thread );
 605         }
 606         release_object( process );
 607     }
 608 }
 609
 610 /* Start debugging an existing process */
 611 DECL_HANDLER(debug_process)
 612 {
 613     struct process *process = get_process_from_id( req->pid );
 614     if (!process) return;
 615
 616     if (!req->attach)
 617     {
 618         debugger_detach( process, current );
 619     }
 620     else if (debugger_attach( process, current ))
 621     {
 622         generate_startup_debug_events( process, NULL );
 623         break_process( process );
 624         resume_process( process );
 625     }
 626     release_object( process );
 627 }
 628
 629 /* queue an exception event */
 630 DECL_HANDLER(queue_exception_event)
 631 {
 632     reply->handle = 0;
 633     if (current->process->debugger)
 634     {
 635         struct debug_event_exception data;
 636         struct debug_event *event;
 637         const CONTEXT *context = get_req_data();
 638         const EXCEPTION_RECORD *rec = (const EXCEPTION_RECORD *)(context + 1);
 639
 640         if (get_req_data_size() < sizeof(*rec) + sizeof(*context))
 641         {
 642             set_error( STATUS_INVALID_PARAMETER );
 643             return;
 644         }
 645         data.record = *rec;
 646         data.first  = req->first;
 647         if ((event = alloc_debug_event( current, EXCEPTION_DEBUG_EVENT, &data, context )))
 648         {
 649             if ((reply->handle = alloc_handle( current->process, event, SYNCHRONIZE, 0 )))
 650             {
 651                 link_event( event );
 652                 suspend_process( current->process );
 653             }
 654             release_object( event );
 655         }
 656     }
 657 }
 658
 659 /* retrieve the status of an exception event */
 660 DECL_HANDLER(get_exception_status)
 661 {
 662     struct debug_event *event;
 663
 664     if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
 665                                                        0, &debug_event_ops )))
 666     {
 667         close_handle( current->process, req->handle );
 668         if (event->state == EVENT_CONTINUED)
 669         {
 670             if (current->context == &event->context)
 671             {
 672                 data_size_t size = min( sizeof(CONTEXT), get_reply_max_size() );
 673                 set_reply_data( &event->context, size );
 674                 current->context = NULL;
 675             }
 676             set_error( event->status );
 677         }
 678         else set_error( STATUS_PENDING );
 679         release_object( event );
 680     }
 681 }
 682
 683 /* send an output string to the debugger */
 684 DECL_HANDLER(output_debug_string)
 685 {
 686     struct debug_event_output_string data;
 687
 688     data.string  = req->string;
 689     data.unicode = req->unicode;
 690     data.length  = req->length;
 691     generate_debug_event( current, OUTPUT_DEBUG_STRING_EVENT, &data );
 692 }
 693
 694 /* simulate a breakpoint in a process */
 695 DECL_HANDLER(debug_break)
 696 {
 697     struct process *process;
 698
 699     reply->self = 0;
 700     if ((process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION /*FIXME*/ )))
 701     {
 702         if (process != current->process) break_process( process );
 703         else reply->self = 1;
 704         release_object( process );
 705     }
 706 }
 707
 708 /* set debugger kill on exit flag */
 709 DECL_HANDLER(set_debugger_kill_on_exit)
 710 {
 711     if (!current->debug_ctx)
 712     {
 713         set_error( STATUS_ACCESS_DENIED );
 714         return;
 715     }
 716     current->debug_ctx->kill_on_exit = req->kill_on_exit;
 717 }