server/process.c

   1 /*
   2  * Server-side process management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <assert.h>
  10 #include <errno.h>
  11 #include <limits.h>
  12 #include <signal.h>
  13 #include <string.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <sys/time.h>
  17 #ifdef HAVE_SYS_SOCKET_H
  18 # include <sys/socket.h>
  19 #endif
  20 #include <unistd.h>
  21
  22 #include "winbase.h"
  23 #include "winnt.h"
  24
  25 #include "handle.h"
  26 #include "process.h"
  27 #include "thread.h"
  28 #include "request.h"
  29 #include "console.h"
  30
  31 /* process structure */
  32
  33 static struct process *first_process;
  34 static int running_processes;
  35
  36 /* process operations */
  37
  38 static void process_dump( struct object *obj, int verbose );
  39 static int process_signaled( struct object *obj, struct thread *thread );
  40 static void process_poll_event( struct object *obj, int event );
  41 static void process_destroy( struct object *obj );
  42
  43 static const struct object_ops process_ops =
  44 {
  45     sizeof(struct process),      /* size */
  46     process_dump,                /* dump */
  47     add_queue,                   /* add_queue */
  48     remove_queue,                /* remove_queue */
  49     process_signaled,            /* signaled */
  50     no_satisfied,                /* satisfied */
  51     NULL,                        /* get_poll_events */
  52     process_poll_event,          /* poll_event */
  53     no_get_fd,                   /* get_fd */
  54     no_flush,                    /* flush */
  55     no_get_file_info,            /* get_file_info */
  56     NULL,                        /* queue_async */
  57     process_destroy              /* destroy */
  58 };
  59
  60 /* process startup info */
  61
  62 struct startup_info
  63 {
  64     struct object       obj;          /* object header */
  65     int                 inherit_all;  /* inherit all handles from parent */
  66     int                 create_flags; /* creation flags */
  67     int                 start_flags;  /* flags from startup info */
  68     handle_t            hstdin;       /* handle for stdin */
  69     handle_t            hstdout;      /* handle for stdout */
  70     handle_t            hstderr;      /* handle for stderr */
  71     int                 cmd_show;     /* main window show mode */
  72     struct file        *exe_file;     /* file handle for main exe */
  73     char               *filename;     /* file name for main exe */
  74     struct thread      *owner;        /* owner thread (the one that created the new process) */
  75     struct process     *process;      /* created process */
  76     struct thread      *thread;       /* created thread */
  77 };
  78
  79 static void startup_info_dump( struct object *obj, int verbose );
  80 static int startup_info_signaled( struct object *obj, struct thread *thread );
  81 static void startup_info_destroy( struct object *obj );
  82
  83 static const struct object_ops startup_info_ops =
  84 {
  85     sizeof(struct startup_info),   /* size */
  86     startup_info_dump,             /* dump */
  87     add_queue,                     /* add_queue */
  88     remove_queue,                  /* remove_queue */
  89     startup_info_signaled,         /* signaled */
  90     no_satisfied,                  /* satisfied */
  91     NULL,                          /* get_poll_events */
  92     NULL,                          /* poll_event */
  93     no_get_fd,                     /* get_fd */
  94     no_flush,                      /* flush */
  95     no_get_file_info,              /* get_file_info */
  96     NULL,                        /* queue_async */
  97     startup_info_destroy           /* destroy */
  98 };
  99
 100
 101 /* set the console and stdio handles for a newly created process */
 102 static int set_process_console( struct process *process, struct thread *parent_thread,
 103                                 struct startup_info *info, struct init_process_reply *reply )
 104 {
 105     if (process->create_flags & CREATE_NEW_CONSOLE)
 106     {
 107         /* let the process init do the allocation */
 108         return 1;
 109     }
 110     else if (parent_thread && !(process->create_flags & DETACHED_PROCESS))
 111     {
 112         /* FIXME: some better error checking should be done...
 113          * like if hConOut and hConIn are console handles, then they should be on the same
 114          * physical console
 115          */
 116         inherit_console( parent_thread, process,
 117                          (info->inherit_all || (info->start_flags & STARTF_USESTDHANDLES)) ?
 118                          info->hstdin : 0 );
 119     }
 120     if (parent_thread)
 121     {
 122         if (!info->inherit_all && !(info->start_flags & STARTF_USESTDHANDLES))
 123         {
 124             /* duplicate the handle from the parent into this process */
 125             reply->hstdin  = duplicate_handle( parent_thread->process, info->hstdin, process,
 126                                                0, TRUE, DUPLICATE_SAME_ACCESS );
 127             reply->hstdout = duplicate_handle( parent_thread->process, info->hstdout, process,
 128                                                0, TRUE, DUPLICATE_SAME_ACCESS );
 129             reply->hstderr = duplicate_handle( parent_thread->process, info->hstderr, process,
 130                                                0, TRUE, DUPLICATE_SAME_ACCESS );
 131         }
 132         else
 133         {
 134             reply->hstdin  = info->hstdin;
 135             reply->hstdout = info->hstdout;
 136             reply->hstderr = info->hstderr;
 137         }
 138     }
 139     else
 140     {
 141         if (process->console)
 142         {
 143             reply->hstdin  = alloc_handle( process, process->console,
 144                                            GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
 145             reply->hstdout = alloc_handle( process, process->console->active,
 146                                            GENERIC_READ | GENERIC_WRITE, 1 );
 147             reply->hstderr = alloc_handle( process, process->console->active,
 148                                            GENERIC_READ | GENERIC_WRITE, 1 );
 149         }
 150         else
 151         {
 152             /* no parent, let the caller decide what to do */
 153             reply->hstdin = reply->hstdout = reply->hstderr = 0;
 154         }
 155     }
 156     /* some handles above may have been invalid; this is not an error */
 157     if (get_error() == STATUS_INVALID_HANDLE) clear_error();
 158     return 1;
 159 }
 160
 161 /* create a new process and its main thread */
 162 struct thread *create_process( int fd )
 163 {
 164     struct process *process;
 165     struct thread *thread = NULL;
 166     int request_pipe[2];
 167
 168     if (!(process = alloc_object( &process_ops, fd ))) return NULL;
 169     process->next            = NULL;
 170     process->prev            = NULL;
 171     process->parent          = NULL;
 172     process->thread_list     = NULL;
 173     process->debugger        = NULL;
 174     process->handles         = NULL;
 175     process->exit_code       = STILL_ACTIVE;
 176     process->running_threads = 0;
 177     process->priority        = NORMAL_PRIORITY_CLASS;
 178     process->affinity        = 1;
 179     process->suspend         = 0;
 180     process->create_flags    = 0;
 181     process->console         = NULL;
 182     process->init_event      = NULL;
 183     process->idle_event      = NULL;
 184     process->queue           = NULL;
 185     process->atom_table      = NULL;
 186     process->ldt_copy        = NULL;
 187     process->exe.next        = NULL;
 188     process->exe.prev        = NULL;
 189     process->exe.file        = NULL;
 190     process->exe.dbg_offset  = 0;
 191     process->exe.dbg_size    = 0;
 192
 193     gettimeofday( &process->start_time, NULL );
 194     if ((process->next = first_process) != NULL) process->next->prev = process;
 195     first_process = process;
 196
 197     /* create the init done event */
 198     if (!(process->init_event = create_event( NULL, 0, 1, 0 ))) goto error;
 199
 200     /* create the main thread */
 201     if (pipe( request_pipe ) == -1)
 202     {
 203         file_set_error();
 204         goto error;
 205     }
 206     send_client_fd( process, request_pipe[1], 0 );
 207     close( request_pipe[1] );
 208     if (!(thread = create_thread( request_pipe[0], process ))) goto error;
 209
 210     set_select_events( &process->obj, POLLIN );  /* start listening to events */
 211     release_object( process );
 212     return thread;
 213
 214  error:
 215     if (thread) release_object( thread );
 216     release_object( process );
 217     return NULL;
 218 }
 219
 220 /* initialize the current process and fill in the request */
 221 static void init_process( int ppid, struct init_process_reply *reply )
 222 {
 223     struct process *process = current->process;
 224     struct thread *parent_thread = get_thread_from_pid( ppid );
 225     struct process *parent = NULL;
 226     struct startup_info *info = NULL;
 227
 228     if (parent_thread)
 229     {
 230         parent = parent_thread->process;
 231         info = parent_thread->info;
 232         if (!info)
 233         {
 234             fatal_protocol_error( current, "init_process: parent but no info\n" );
 235             return;
 236         }
 237         if (info->thread)
 238         {
 239             fatal_protocol_error( current, "init_process: called twice?\n" );
 240             return;
 241         }
 242         process->parent = (struct process *)grab_object( parent );
 243     }
 244
 245     /* set the process flags */
 246     process->create_flags = info ? info->create_flags : 0;
 247
 248     /* create the handle table */
 249     if (parent && info->inherit_all)
 250         process->handles = copy_handle_table( process, parent );
 251     else
 252         process->handles = alloc_handle_table( process, 0 );
 253     if (!process->handles) return;
 254
 255     /* retrieve the main exe file */
 256     reply->exe_file = 0;
 257     if (parent && info->exe_file)
 258     {
 259         process->exe.file = (struct file *)grab_object( info->exe_file );
 260         if (!(reply->exe_file = alloc_handle( process, process->exe.file, GENERIC_READ, 0 )))
 261             return;
 262     }
 263
 264     /* set the process console */
 265     if (!set_process_console( process, parent_thread, info, reply )) return;
 266
 267     if (parent)
 268     {
 269         /* attach to the debugger if requested */
 270         if (process->create_flags & (DEBUG_PROCESS | DEBUG_ONLY_THIS_PROCESS))
 271             set_process_debugger( process, parent_thread );
 272         else if (parent && parent->debugger && !(parent->create_flags & DEBUG_ONLY_THIS_PROCESS))
 273             set_process_debugger( process, parent->debugger );
 274     }
 275
 276     /* thread will be actually suspended in init_done */
 277     if (process->create_flags & CREATE_SUSPENDED) current->suspend++;
 278
 279     if (info)
 280     {
 281         size_t size = strlen(info->filename);
 282         if (size > get_reply_max_size()) size = get_reply_max_size();
 283         reply->start_flags = info->start_flags;
 284         reply->cmd_show    = info->cmd_show;
 285         set_reply_data( info->filename, size );
 286         info->process = (struct process *)grab_object( process );
 287         info->thread  = (struct thread *)grab_object( current );
 288         wake_up( &info->obj, 0 );
 289     }
 290     else
 291     {
 292         reply->start_flags  = STARTF_USESTDHANDLES;
 293         reply->cmd_show     = 0;
 294     }
 295     reply->create_flags = process->create_flags;
 296     reply->server_start = server_start_ticks;
 297 }
 298
 299 /* destroy a process when its refcount is 0 */
 300 static void process_destroy( struct object *obj )
 301 {
 302     struct process *process = (struct process *)obj;
 303     assert( obj->ops == &process_ops );
 304
 305     /* we can't have a thread remaining */
 306     assert( !process->thread_list );
 307     if (process->console) release_object( process->console );
 308     if (process->parent) release_object( process->parent );
 309     if (process->next) process->next->prev = process->prev;
 310     if (process->prev) process->prev->next = process->next;
 311     else first_process = process->next;
 312     if (process->init_event) release_object( process->init_event );
 313     if (process->idle_event) release_object( process->idle_event );
 314     if (process->queue) release_object( process->queue );
 315     if (process->atom_table) release_object( process->atom_table );
 316     if (process->exe.file) release_object( process->exe.file );
 317 }
 318
 319 /* dump a process on stdout for debugging purposes */
 320 static void process_dump( struct object *obj, int verbose )
 321 {
 322     struct process *process = (struct process *)obj;
 323     assert( obj->ops == &process_ops );
 324
 325     fprintf( stderr, "Process next=%p prev=%p handles=%p\n",
 326              process->next, process->prev, process->handles );
 327 }
 328
 329 static int process_signaled( struct object *obj, struct thread *thread )
 330 {
 331     struct process *process = (struct process *)obj;
 332     return !process->running_threads;
 333 }
 334
 335
 336 static void process_poll_event( struct object *obj, int event )
 337 {
 338     struct process *process = (struct process *)obj;
 339     assert( obj->ops == &process_ops );
 340
 341     if (event & (POLLERR | POLLHUP)) set_select_events( obj, -1 );
 342     else if (event & POLLIN) receive_fd( process );
 343 }
 344
 345 static void startup_info_destroy( struct object *obj )
 346 {
 347     struct startup_info *info = (struct startup_info *)obj;
 348     assert( obj->ops == &startup_info_ops );
 349     if (info->filename) free( info->filename );
 350     if (info->exe_file) release_object( info->exe_file );
 351     if (info->process) release_object( info->process );
 352     if (info->thread) release_object( info->thread );
 353     if (info->owner)
 354     {
 355         info->owner->info = NULL;
 356         release_object( info->owner );
 357     }
 358 }
 359
 360 static void startup_info_dump( struct object *obj, int verbose )
 361 {
 362     struct startup_info *info = (struct startup_info *)obj;
 363     assert( obj->ops == &startup_info_ops );
 364
 365     fprintf( stderr, "Startup info flags=%x in=%d out=%d err=%d name='%s'\n",
 366              info->start_flags, info->hstdin, info->hstdout, info->hstderr, info->filename );
 367 }
 368
 369 static int startup_info_signaled( struct object *obj, struct thread *thread )
 370 {
 371     struct startup_info *info = (struct startup_info *)obj;
 372     return (info->thread != NULL);
 373 }
 374
 375
 376 /* get a process from an id (and increment the refcount) */
 377 struct process *get_process_from_id( void *id )
 378 {
 379     struct process *p = first_process;
 380     while (p && (p != id)) p = p->next;
 381     if (p) grab_object( p );
 382     else set_error( STATUS_INVALID_PARAMETER );
 383     return p;
 384 }
 385
 386 /* get a process from a handle (and increment the refcount) */
 387 struct process *get_process_from_handle( handle_t handle, unsigned int access )
 388 {
 389     return (struct process *)get_handle_obj( current->process, handle,
 390                                              access, &process_ops );
 391 }
 392
 393 /* add a dll to a process list */
 394 static struct process_dll *process_load_dll( struct process *process, struct file *file,
 395                                              void *base )
 396 {
 397     struct process_dll *dll;
 398
 399     /* make sure we don't already have one with the same base address */
 400     for (dll = process->exe.next; dll; dll = dll->next) if (dll->base == base)
 401     {
 402         set_error( STATUS_INVALID_PARAMETER );
 403         return NULL;
 404     }
 405
 406     if ((dll = mem_alloc( sizeof(*dll) )))
 407     {
 408         dll->prev = &process->exe;
 409         dll->file = NULL;
 410         dll->base = base;
 411         if (file) dll->file = (struct file *)grab_object( file );
 412         if ((dll->next = process->exe.next)) dll->next->prev = dll;
 413         process->exe.next = dll;
 414     }
 415     return dll;
 416 }
 417
 418 /* remove a dll from a process list */
 419 static void process_unload_dll( struct process *process, void *base )
 420 {
 421     struct process_dll *dll;
 422
 423     for (dll = process->exe.next; dll; dll = dll->next)
 424     {
 425         if (dll->base == base)
 426         {
 427             if (dll->file) release_object( dll->file );
 428             if (dll->next) dll->next->prev = dll->prev;
 429             if (dll->prev) dll->prev->next = dll->next;
 430             free( dll );
 431             generate_debug_event( current, UNLOAD_DLL_DEBUG_EVENT, base );
 432             return;
 433         }
 434     }
 435     set_error( STATUS_INVALID_PARAMETER );
 436 }
 437
 438 /* kill all processes being attached to a console renderer */
 439 void kill_console_processes( struct thread *renderer, int exit_code )
 440 {
 441     for (;;)  /* restart from the beginning of the list every time */
 442     {
 443         struct process *process = first_process;
 444
 445         /* find the first process being attached to 'renderer' and still running */
 446         while (process &&
 447                (process == renderer->process || !process->console ||
 448                 process->console->renderer != renderer || !process->running_threads))
 449         {
 450             process = process->next;
 451         }
 452         if (!process) break;
 453         kill_process( process, NULL, exit_code );
 454     }
 455 }
 456
 457 /* a process has been killed (i.e. its last thread died) */
 458 static void process_killed( struct process *process )
 459 {
 460     assert( !process->thread_list );
 461     gettimeofday( &process->end_time, NULL );
 462     if (process->handles) release_object( process->handles );
 463     process->handles = NULL;
 464
 465     /* close the console attached to this process, if any */
 466     free_console( process );
 467
 468     while (process->exe.next)
 469     {
 470         struct process_dll *dll = process->exe.next;
 471         process->exe.next = dll->next;
 472         if (dll->file) release_object( dll->file );
 473         free( dll );
 474     }
 475     if (process->exe.file) release_object( process->exe.file );
 476     process->exe.file = NULL;
 477     wake_up( &process->obj, 0 );
 478     if (!--running_processes)
 479     {
 480         /* last process died, close global handles */
 481         close_global_handles();
 482         /* this will cause the select loop to terminate */
 483         if (!persistent_server) close_master_socket();
 484     }
 485 }
 486
 487 /* add a thread to a process running threads list */
 488 void add_process_thread( struct process *process, struct thread *thread )
 489 {
 490     thread->proc_next = process->thread_list;
 491     thread->proc_prev = NULL;
 492     if (thread->proc_next) thread->proc_next->proc_prev = thread;
 493     process->thread_list = thread;
 494     if (!process->running_threads++) running_processes++;
 495     grab_object( thread );
 496 }
 497
 498 /* remove a thread from a process running threads list */
 499 void remove_process_thread( struct process *process, struct thread *thread )
 500 {
 501     assert( process->running_threads > 0 );
 502     assert( process->thread_list );
 503
 504     if (thread->proc_next) thread->proc_next->proc_prev = thread->proc_prev;
 505     if (thread->proc_prev) thread->proc_prev->proc_next = thread->proc_next;
 506     else process->thread_list = thread->proc_next;
 507
 508     if (!--process->running_threads)
 509     {
 510         /* we have removed the last running thread, exit the process */
 511         process->exit_code = thread->exit_code;
 512         generate_debug_event( thread, EXIT_PROCESS_DEBUG_EVENT, process );
 513         process_killed( process );
 514     }
 515     else generate_debug_event( thread, EXIT_THREAD_DEBUG_EVENT, thread );
 516     release_object( thread );
 517 }
 518
 519 /* suspend all the threads of a process */
 520 void suspend_process( struct process *process )
 521 {
 522     if (!process->suspend++)
 523     {
 524         struct thread *thread = process->thread_list;
 525         for (; thread; thread = thread->proc_next)
 526         {
 527             if (!thread->suspend) stop_thread( thread );
 528         }
 529     }
 530 }
 531
 532 /* resume all the threads of a process */
 533 void resume_process( struct process *process )
 534 {
 535     assert (process->suspend > 0);
 536     if (!--process->suspend)
 537     {
 538         struct thread *thread = process->thread_list;
 539         for (; thread; thread = thread->proc_next)
 540         {
 541             if (!thread->suspend) continue_thread( thread );
 542         }
 543     }
 544 }
 545
 546 /* kill a process on the spot */
 547 void kill_process( struct process *process, struct thread *skip, int exit_code )
 548 {
 549     struct thread *thread = process->thread_list;
 550
 551     while (thread)
 552     {
 553         struct thread *next = thread->proc_next;
 554         thread->exit_code = exit_code;
 555         if (thread != skip) kill_thread( thread, 1 );
 556         thread = next;
 557     }
 558 }
 559
 560 /* kill all processes being debugged by a given thread */
 561 void kill_debugged_processes( struct thread *debugger, int exit_code )
 562 {
 563     for (;;)  /* restart from the beginning of the list every time */
 564     {
 565         struct process *process = first_process;
 566         /* find the first process being debugged by 'debugger' and still running */
 567         while (process && (process->debugger != debugger || !process->running_threads))
 568             process = process->next;
 569         if (!process) return;
 570         process->debugger = NULL;
 571         kill_process( process, NULL, exit_code );
 572     }
 573 }
 574
 575
 576 /* get all information about a process */
 577 static void get_process_info( struct process *process, struct get_process_info_reply *reply )
 578 {
 579     reply->pid              = process;
 580     reply->debugged         = (process->debugger != 0);
 581     reply->exit_code        = process->exit_code;
 582     reply->priority         = process->priority;
 583     reply->process_affinity = process->affinity;
 584     reply->system_affinity  = 1;
 585 }
 586
 587 /* set all information about a process */
 588 static void set_process_info( struct process *process,
 589                               const struct set_process_info_request *req )
 590 {
 591     if (req->mask & SET_PROCESS_INFO_PRIORITY)
 592         process->priority = req->priority;
 593     if (req->mask & SET_PROCESS_INFO_AFFINITY)
 594     {
 595         if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
 596         else process->affinity = req->affinity;
 597     }
 598 }
 599
 600 /* read data from a process memory space */
 601 /* len is the total size (in ints) */
 602 static int read_process_memory( struct process *process, const int *addr, size_t len, int *dest )
 603 {
 604     struct thread *thread = process->thread_list;
 605
 606     assert( !((unsigned int)addr % sizeof(int)) );  /* address must be aligned */
 607
 608     if (!thread)  /* process is dead */
 609     {
 610         set_error( STATUS_ACCESS_DENIED );
 611         return 0;
 612     }
 613     if (suspend_for_ptrace( thread ))
 614     {
 615         while (len > 0)
 616         {
 617             if (read_thread_int( thread, addr++, dest++ ) == -1) break;
 618             len--;
 619         }
 620         resume_thread( thread );
 621     }
 622     return !len;
 623 }
 624
 625 /* make sure we can write to the whole address range */
 626 /* len is the total size (in ints) */
 627 static int check_process_write_access( struct thread *thread, int *addr, size_t len )
 628 {
 629     int page = get_page_size() / sizeof(int);
 630
 631     for (;;)
 632     {
 633         if (write_thread_int( thread, addr, 0, 0 ) == -1) return 0;
 634         if (len <= page) break;
 635         addr += page;
 636         len -= page;
 637     }
 638     return (write_thread_int( thread, addr + len - 1, 0, 0 ) != -1);
 639 }
 640
 641 /* write data to a process memory space */
 642 /* len is the total size (in ints), max is the size we can actually read from the input buffer */
 643 /* we check the total size for write permissions */
 644 static void write_process_memory( struct process *process, int *addr, size_t len,
 645                                   unsigned int first_mask, unsigned int last_mask, const int *src )
 646 {
 647     struct thread *thread = process->thread_list;
 648
 649     assert( !((unsigned int)addr % sizeof(int) ));  /* address must be aligned */
 650
 651     if (!thread)  /* process is dead */
 652     {
 653         set_error( STATUS_ACCESS_DENIED );
 654         return;
 655     }
 656     if (suspend_for_ptrace( thread ))
 657     {
 658         if (!check_process_write_access( thread, addr, len ))
 659         {
 660             set_error( STATUS_ACCESS_DENIED );
 661             return;
 662         }
 663         /* first word is special */
 664         if (len > 1)
 665         {
 666             if (write_thread_int( thread, addr++, *src++, first_mask ) == -1) goto done;
 667             len--;
 668         }
 669         else last_mask &= first_mask;
 670
 671         while (len > 1)
 672         {
 673             if (write_thread_int( thread, addr++, *src++, ~0 ) == -1) goto done;
 674             len--;
 675         }
 676
 677         /* last word is special too */
 678         if (write_thread_int( thread, addr, *src, last_mask ) == -1) goto done;
 679
 680     done:
 681         resume_thread( thread );
 682     }
 683 }
 684
 685 /* take a snapshot of currently running processes */
 686 struct process_snapshot *process_snap( int *count )
 687 {
 688     struct process_snapshot *snapshot, *ptr;
 689     struct process *process;
 690     if (!running_processes) return NULL;
 691     if (!(snapshot = mem_alloc( sizeof(*snapshot) * running_processes )))
 692         return NULL;
 693     ptr = snapshot;
 694     for (process = first_process; process; process = process->next)
 695     {
 696         if (!process->running_threads) continue;
 697         ptr->process  = process;
 698         ptr->threads  = process->running_threads;
 699         ptr->count    = process->obj.refcount;
 700         ptr->priority = process->priority;
 701         grab_object( process );
 702         ptr++;
 703     }
 704     *count = running_processes;
 705     return snapshot;
 706 }
 707
 708 /* take a snapshot of the modules of a process */
 709 struct module_snapshot *module_snap( struct process *process, int *count )
 710 {
 711     struct module_snapshot *snapshot, *ptr;
 712     struct process_dll *dll;
 713     int total = 0;
 714
 715     for (dll = &process->exe; dll; dll = dll->next) total++;
 716     if (!(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
 717
 718     for (ptr = snapshot, dll = &process->exe; dll; dll = dll->next, ptr++)
 719     {
 720         ptr->base = dll->base;
 721     }
 722     *count = total;
 723     return snapshot;
 724 }
 725
 726
 727 /* create a new process */
 728 DECL_HANDLER(new_process)
 729 {
 730     size_t len = get_req_data_size();
 731     struct startup_info *info;
 732
 733     if (current->info)
 734     {
 735         fatal_protocol_error( current, "new_process: another process is being created\n" );
 736         return;
 737     }
 738
 739     /* build the startup info for a new process */
 740     if (!(info = alloc_object( &startup_info_ops, -1 ))) return;
 741     info->inherit_all  = req->inherit_all;
 742     info->create_flags = req->create_flags;
 743     info->start_flags  = req->start_flags;
 744     info->hstdin       = req->hstdin;
 745     info->hstdout      = req->hstdout;
 746     info->hstderr      = req->hstderr;
 747     info->cmd_show     = req->cmd_show;
 748     info->exe_file     = NULL;
 749     info->filename     = NULL;
 750     info->owner        = (struct thread *)grab_object( current );
 751     info->process      = NULL;
 752     info->thread       = NULL;
 753
 754     if (req->exe_file &&
 755         !(info->exe_file = get_file_obj( current->process, req->exe_file, GENERIC_READ )))
 756         goto done;
 757
 758     if (!(info->filename = mem_alloc( len + 1 ))) goto done;
 759
 760     memcpy( info->filename, get_req_data(), len );
 761     info->filename[len] = 0;
 762     current->info = info;
 763     reply->info = alloc_handle( current->process, info, SYNCHRONIZE, FALSE );
 764
 765  done:
 766     release_object( info );
 767 }
 768
 769 /* Retrieve information about a newly started process */
 770 DECL_HANDLER(get_new_process_info)
 771 {
 772     struct startup_info *info;
 773
 774     reply->event = 0;
 775
 776     if ((info = (struct startup_info *)get_handle_obj( current->process, req->info,
 777                                                        0, &startup_info_ops )))
 778     {
 779         reply->pid = get_process_id( info->process );
 780         reply->tid = get_thread_id( info->thread );
 781         reply->phandle = alloc_handle( current->process, info->process,
 782                                        PROCESS_ALL_ACCESS, req->pinherit );
 783         reply->thandle = alloc_handle( current->process, info->thread,
 784                                        THREAD_ALL_ACCESS, req->tinherit );
 785         if (info->process->init_event)
 786             reply->event = alloc_handle( current->process, info->process->init_event,
 787                                        EVENT_ALL_ACCESS, 0 );
 788         release_object( info );
 789     }
 790     else
 791     {
 792         reply->pid     = 0;
 793         reply->tid     = 0;
 794         reply->phandle = 0;
 795         reply->thandle = 0;
 796     }
 797 }
 798
 799 /* initialize a new process */
 800 DECL_HANDLER(init_process)
 801 {
 802     if (!current->unix_pid)
 803     {
 804         fatal_protocol_error( current, "init_process: init_thread not called yet\n" );
 805         return;
 806     }
 807     current->process->ldt_copy  = req->ldt_copy;
 808     init_process( req->ppid, reply );
 809 }
 810
 811 /* signal the end of the process initialization */
 812 DECL_HANDLER(init_process_done)
 813 {
 814     struct file *file = NULL;
 815     struct process *process = current->process;
 816
 817     if (!process->init_event)
 818     {
 819         fatal_protocol_error( current, "init_process_done: no event\n" );
 820         return;
 821     }
 822     process->exe.base = req->module;
 823     process->exe.name = req->name;
 824
 825     if (req->exe_file) file = get_file_obj( current->process, req->exe_file, GENERIC_READ );
 826     if (process->exe.file) release_object( process->exe.file );
 827     process->exe.file = file;
 828
 829     generate_startup_debug_events( current->process, req->entry );
 830     set_event( process->init_event );
 831     release_object( process->init_event );
 832     process->init_event = NULL;
 833     if (req->gui) process->idle_event = create_event( NULL, 0, 1, 0 );
 834     if (current->suspend + current->process->suspend > 0) stop_thread( current );
 835     reply->debugged = (current->process->debugger != 0);
 836 }
 837
 838 /* open a handle to a process */
 839 DECL_HANDLER(open_process)
 840 {
 841     struct process *process = get_process_from_id( req->pid );
 842     reply->handle = 0;
 843     if (process)
 844     {
 845         reply->handle = alloc_handle( current->process, process, req->access, req->inherit );
 846         release_object( process );
 847     }
 848 }
 849
 850 /* terminate a process */
 851 DECL_HANDLER(terminate_process)
 852 {
 853     struct process *process;
 854
 855     if ((process = get_process_from_handle( req->handle, PROCESS_TERMINATE )))
 856     {
 857         reply->self = (current->process == process);
 858         kill_process( process, current, req->exit_code );
 859         release_object( process );
 860     }
 861 }
 862
 863 /* fetch information about a process */
 864 DECL_HANDLER(get_process_info)
 865 {
 866     struct process *process;
 867
 868     if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION )))
 869     {
 870         get_process_info( process, reply );
 871         release_object( process );
 872     }
 873 }
 874
 875 /* set information about a process */
 876 DECL_HANDLER(set_process_info)
 877 {
 878     struct process *process;
 879
 880     if ((process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION )))
 881     {
 882         set_process_info( process, req );
 883         release_object( process );
 884     }
 885 }
 886
 887 /* read data from a process address space */
 888 DECL_HANDLER(read_process_memory)
 889 {
 890     struct process *process;
 891     size_t len = get_reply_max_size();
 892
 893     if (!(process = get_process_from_handle( req->handle, PROCESS_VM_READ ))) return;
 894
 895     if (len)
 896     {
 897         unsigned int start_offset = (unsigned int)req->addr % sizeof(int);
 898         unsigned int nb_ints = (len + start_offset + sizeof(int) - 1) / sizeof(int);
 899         const int *start = (int *)((char *)req->addr - start_offset);
 900         int *buffer = mem_alloc( nb_ints * sizeof(int) );
 901         if (buffer)
 902         {
 903             if (read_process_memory( process, start, nb_ints, buffer ))
 904             {
 905                 /* move start of requested data to start of buffer */
 906                 if (start_offset) memmove( buffer, (char *)buffer + start_offset, len );
 907                 set_reply_data_ptr( buffer, len );
 908             }
 909             else len = 0;
 910         }
 911     }
 912     release_object( process );
 913 }
 914
 915 /* write data to a process address space */
 916 DECL_HANDLER(write_process_memory)
 917 {
 918     struct process *process;
 919
 920     if ((process = get_process_from_handle( req->handle, PROCESS_VM_WRITE )))
 921     {
 922         size_t len = get_req_data_size();
 923         if ((len % sizeof(int)) || ((unsigned int)req->addr % sizeof(int)))
 924             set_error( STATUS_INVALID_PARAMETER );
 925         else
 926         {
 927             if (len) write_process_memory( process, req->addr, len / sizeof(int),
 928                                            req->first_mask, req->last_mask, get_req_data() );
 929         }
 930         release_object( process );
 931     }
 932 }
 933
 934 /* notify the server that a dll has been loaded */
 935 DECL_HANDLER(load_dll)
 936 {
 937     struct process_dll *dll;
 938     struct file *file = NULL;
 939
 940     if (req->handle &&
 941         !(file = get_file_obj( current->process, req->handle, GENERIC_READ ))) return;
 942
 943     if ((dll = process_load_dll( current->process, file, req->base )))
 944     {
 945         dll->dbg_offset = req->dbg_offset;
 946         dll->dbg_size   = req->dbg_size;
 947         dll->name       = req->name;
 948         /* only generate event if initialization is done */
 949         if (!current->process->init_event)
 950             generate_debug_event( current, LOAD_DLL_DEBUG_EVENT, dll );
 951     }
 952     if (file) release_object( file );
 953 }
 954
 955 /* notify the server that a dll is being unloaded */
 956 DECL_HANDLER(unload_dll)
 957 {
 958     process_unload_dll( current->process, req->base );
 959 }
 960
 961 /* wait for a process to start waiting on input */
 962 /* FIXME: only returns event for now, wait is done in the client */
 963 DECL_HANDLER(wait_input_idle)
 964 {
 965     struct process *process;
 966
 967     reply->event = 0;
 968     if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION )))
 969     {
 970         if (process->idle_event && process != current->process && process->queue != current->queue)
 971             reply->event = alloc_handle( current->process, process->idle_event,
 972                                          EVENT_ALL_ACCESS, 0 );
 973         release_object( process );
 974     }
 975 }