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