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