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_read_fd,                  /* get_read_fd */
  52     no_write_fd,                 /* get_write_fd */
  53     no_flush,                    /* flush */
  54     no_get_file_info,            /* get_file_info */
  55     process_destroy              /* destroy */
  56 };
  57
  58 /* set the process creation info */
  59 static int set_creation_info( struct process *process, struct new_process_request *req,
  60                               const char *cmd_line, size_t len )
  61 {
  62     if (!(process->info = mem_alloc( sizeof(*process->info) + len ))) return 0;
  63     if (req)
  64     {
  65         /* copy the request structure */
  66         memcpy( process->info, req, sizeof(*req) );
  67     }
  68     else  /* no request, use defaults */
  69     {
  70         req = process->info;
  71         req->inherit      = 0;
  72         req->inherit_all  = 0;
  73         req->create_flags = CREATE_NEW_CONSOLE;
  74         req->start_flags  = STARTF_USESTDHANDLES;
  75         req->exe_file     = -1;
  76         req->hstdin       = -1;
  77         req->hstdout      = -1;
  78         req->hstderr      = -1;
  79         req->event        = -1;
  80         req->cmd_show     = 0;
  81         req->env_ptr      = NULL;
  82     }
  83     memcpy( process->info->cmdline, cmd_line, len );
  84     process->info->cmdline[len] = 0;
  85     process->create_flags = process->info->create_flags;
  86     return 1;
  87 }
  88
  89 /* set the console and stdio handles for a newly created process */
  90 static int set_process_console( struct process *process, struct process *parent )
  91 {
  92     struct new_process_request *info = process->info;
  93
  94     if (process->create_flags & CREATE_NEW_CONSOLE)
  95     {
  96         if (!alloc_console( process )) return 0;
  97     }
  98     else if (!(process->create_flags & DETACHED_PROCESS))
  99     {
 100         if (parent->console_in) process->console_in = grab_object( parent->console_in );
 101         if (parent->console_out) process->console_out = grab_object( parent->console_out );
 102     }
 103     if (parent)
 104     {
 105         if (!info->inherit_all && !(info->start_flags & STARTF_USESTDHANDLES))
 106         {
 107             /* duplicate the handle from the parent into this process */
 108             info->hstdin  = duplicate_handle( parent, info->hstdin, process,
 109                                               0, TRUE, DUPLICATE_SAME_ACCESS );
 110             info->hstdout = duplicate_handle( parent, info->hstdout, process,
 111                                               0, TRUE, DUPLICATE_SAME_ACCESS );
 112             info->hstderr = duplicate_handle( parent, info->hstderr, process,
 113                                               0, TRUE, DUPLICATE_SAME_ACCESS );
 114         }
 115     }
 116     else
 117     {
 118         /* no parent, use handles to the console for stdio */
 119         info->hstdin  = alloc_handle( process, process->console_in,
 120                                       GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
 121         info->hstdout = alloc_handle( process, process->console_out,
 122                                       GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
 123         info->hstderr = alloc_handle( process, process->console_out,
 124                                       GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
 125     }
 126     return 1;
 127 }
 128
 129 /* create a new process and its main thread */
 130 struct thread *create_process( int fd, struct process *parent,
 131                                struct new_process_request *req,
 132                                const char *cmd_line, size_t len )
 133 {
 134     struct process *process;
 135     struct thread *thread = NULL;
 136
 137     if (!(process = alloc_object( &process_ops, -1 )))
 138     {
 139         close( fd );
 140         return NULL;
 141     }
 142     process->next            = NULL;
 143     process->prev            = NULL;
 144     process->thread_list     = NULL;
 145     process->debugger        = NULL;
 146     process->exe_file        = NULL;
 147     process->handles         = NULL;
 148     process->exit_code       = STILL_ACTIVE;
 149     process->running_threads = 0;
 150     process->priority        = NORMAL_PRIORITY_CLASS;
 151     process->affinity        = 1;
 152     process->suspend         = 0;
 153     process->create_flags    = 0;
 154     process->console_in      = NULL;
 155     process->console_out     = NULL;
 156     process->init_event      = NULL;
 157     process->info            = NULL;
 158     process->ldt_copy        = NULL;
 159     process->ldt_flags       = NULL;
 160     gettimeofday( &process->start_time, NULL );
 161     if ((process->next = first_process) != NULL) process->next->prev = process;
 162     first_process = process;
 163
 164     /* copy the request structure */
 165     if (!set_creation_info( process, req, cmd_line, len )) goto error;
 166
 167     if (process->info->inherit_all)
 168         process->handles = copy_handle_table( process, parent );
 169     else
 170         process->handles = alloc_handle_table( process, 0 );
 171     if (!process->handles) goto error;
 172
 173     /* alloc a handle for the process itself */
 174     alloc_handle( process, process, PROCESS_ALL_ACCESS, 0 );
 175
 176     /* retrieve the main exe file */
 177     if (process->info->exe_file != -1)
 178     {
 179         if (!(process->exe_file = get_file_obj( parent, process->info->exe_file,
 180                                                 GENERIC_READ ))) goto error;
 181         process->info->exe_file = -1;
 182     }
 183
 184     /* get the init done event */
 185     if (process->info->event != -1)
 186     {
 187         if (!(process->init_event = get_event_obj( parent, process->info->event,
 188                                                    EVENT_MODIFY_STATE ))) goto error;
 189     }
 190
 191     /* set the process console */
 192     if (!set_process_console( process, parent )) goto error;
 193
 194     /* create the main thread */
 195     if (!(thread = create_thread( fd, process, (process->create_flags & CREATE_SUSPENDED) != 0)))
 196         goto error;
 197
 198     /* attach to the debugger if requested */
 199     if (process->create_flags & (DEBUG_PROCESS | DEBUG_ONLY_THIS_PROCESS))
 200         debugger_attach( process, current );
 201     else if (parent && parent->debugger && !(parent->create_flags & DEBUG_ONLY_THIS_PROCESS))
 202         debugger_attach( process, parent->debugger );
 203
 204     release_object( process );
 205     return thread;
 206
 207  error:
 208     close( fd );
 209     free_console( process );
 210     if (process->handles) release_object( process->handles );
 211     release_object( process );
 212     return NULL;
 213 }
 214
 215 /* destroy a process when its refcount is 0 */
 216 static void process_destroy( struct object *obj )
 217 {
 218     struct process *process = (struct process *)obj;
 219     assert( obj->ops == &process_ops );
 220
 221     /* we can't have a thread remaining */
 222     assert( !process->thread_list );
 223     if (process->next) process->next->prev = process->prev;
 224     if (process->prev) process->prev->next = process->next;
 225     else first_process = process->next;
 226     if (process->info) free( process->info );
 227     if (process->init_event) release_object( process->init_event );
 228     if (process->exe_file) release_object( process->exe_file );
 229 }
 230
 231 /* dump a process on stdout for debugging purposes */
 232 static void process_dump( struct object *obj, int verbose )
 233 {
 234     struct process *process = (struct process *)obj;
 235     assert( obj->ops == &process_ops );
 236
 237     fprintf( stderr, "Process next=%p prev=%p console=%p/%p handles=%p\n",
 238              process->next, process->prev, process->console_in, process->console_out,
 239              process->handles );
 240 }
 241
 242 static int process_signaled( struct object *obj, struct thread *thread )
 243 {
 244     struct process *process = (struct process *)obj;
 245     return !process->running_threads;
 246 }
 247
 248
 249 /* get a process from an id (and increment the refcount) */
 250 struct process *get_process_from_id( void *id )
 251 {
 252     struct process *p = first_process;
 253     while (p && (p != id)) p = p->next;
 254     if (p) grab_object( p );
 255     else set_error( STATUS_INVALID_PARAMETER );
 256     return p;
 257 }
 258
 259 /* get a process from a handle (and increment the refcount) */
 260 struct process *get_process_from_handle( int handle, unsigned int access )
 261 {
 262     return (struct process *)get_handle_obj( current->process, handle,
 263                                              access, &process_ops );
 264 }
 265
 266 /* a process has been killed (i.e. its last thread died) */
 267 static void process_killed( struct process *process, int exit_code )
 268 {
 269     assert( !process->thread_list );
 270     process->exit_code = exit_code;
 271     gettimeofday( &process->end_time, NULL );
 272     release_object( process->handles );
 273     process->handles = NULL;
 274     free_console( process );
 275     if (process->exe_file) release_object( process->exe_file );
 276     process->exe_file = NULL;
 277     wake_up( &process->obj, 0 );
 278     if (!--running_processes)
 279     {
 280         /* last process died, close global handles */
 281         close_global_handles();
 282         /* this will cause the select loop to terminate */
 283         if (!persistent_server) close_master_socket();
 284     }
 285 }
 286
 287 /* add a thread to a process running threads list */
 288 void add_process_thread( struct process *process, struct thread *thread )
 289 {
 290     thread->proc_next = process->thread_list;
 291     thread->proc_prev = NULL;
 292     if (thread->proc_next) thread->proc_next->proc_prev = thread;
 293     process->thread_list = thread;
 294     if (!process->running_threads++) running_processes++;
 295     grab_object( thread );
 296 }
 297
 298 /* remove a thread from a process running threads list */
 299 void remove_process_thread( struct process *process, struct thread *thread )
 300 {
 301     assert( process->running_threads > 0 );
 302     assert( process->thread_list );
 303
 304     if (thread->proc_next) thread->proc_next->proc_prev = thread->proc_prev;
 305     if (thread->proc_prev) thread->proc_prev->proc_next = thread->proc_next;
 306     else process->thread_list = thread->proc_next;
 307
 308     if (!--process->running_threads)
 309     {
 310         /* we have removed the last running thread, exit the process */
 311         process_killed( process, thread->exit_code );
 312     }
 313     release_object( thread );
 314 }
 315
 316 /* suspend all the threads of a process */
 317 void suspend_process( struct process *process )
 318 {
 319     if (!process->suspend++)
 320     {
 321         struct thread *thread = process->thread_list;
 322         for (; thread; thread = thread->proc_next)
 323         {
 324             if (!thread->suspend) stop_thread( thread );
 325         }
 326     }
 327 }
 328
 329 /* resume all the threads of a process */
 330 void resume_process( struct process *process )
 331 {
 332     assert (process->suspend > 0);
 333     if (!--process->suspend)
 334     {
 335         struct thread *thread = process->thread_list;
 336         for (; thread; thread = thread->proc_next)
 337         {
 338             if (!thread->suspend) continue_thread( thread );
 339         }
 340     }
 341 }
 342
 343 /* kill a process on the spot */
 344 void kill_process( struct process *process, int exit_code )
 345 {
 346     while (process->thread_list)
 347         kill_thread( process->thread_list, exit_code );
 348 }
 349
 350 /* kill all processes being debugged by a given thread */
 351 void kill_debugged_processes( struct thread *debugger, int exit_code )
 352 {
 353     for (;;)  /* restart from the beginning of the list every time */
 354     {
 355         struct process *process = first_process;
 356         /* find the first process being debugged by 'debugger' and still running */
 357         while (process && (process->debugger != debugger || !process->running_threads))
 358             process = process->next;
 359         if (!process) return;
 360         process->debugger = NULL;
 361         kill_process( process, exit_code );
 362     }
 363 }
 364
 365 /* get all information about a process */
 366 static void get_process_info( struct process *process, struct get_process_info_request *req )
 367 {
 368     req->pid              = process;
 369     req->exit_code        = process->exit_code;
 370     req->priority         = process->priority;
 371     req->process_affinity = process->affinity;
 372     req->system_affinity  = 1;
 373 }
 374
 375 /* set all information about a process */
 376 static void set_process_info( struct process *process,
 377                               struct set_process_info_request *req )
 378 {
 379     if (req->mask & SET_PROCESS_INFO_PRIORITY)
 380         process->priority = req->priority;
 381     if (req->mask & SET_PROCESS_INFO_AFFINITY)
 382     {
 383         if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
 384         else process->affinity = req->affinity;
 385     }
 386 }
 387
 388 /* read data from a process memory space */
 389 /* len is the total size (in ints), max is the size we can actually store in the output buffer */
 390 /* we read the total size in all cases to check for permissions */
 391 static void read_process_memory( struct process *process, const int *addr,
 392                                  size_t len, size_t max, int *dest )
 393 {
 394     struct thread *thread = process->thread_list;
 395
 396     if ((unsigned int)addr % sizeof(int))  /* address must be aligned */
 397     {
 398         set_error( STATUS_INVALID_PARAMETER );
 399         return;
 400     }
 401     suspend_thread( thread, 0 );
 402     if (thread->attached)
 403     {
 404         while (len > 0 && max)
 405         {
 406             if (read_thread_int( thread, addr++, dest++ ) == -1) goto done;
 407             max--;
 408             len--;
 409         }
 410         /* check the rest for read permission */
 411         if (len > 0)
 412         {
 413             int dummy, page = get_page_size() / sizeof(int);
 414             while (len >= page)
 415             {
 416                 addr += page;
 417                 len -= page;
 418                 if (read_thread_int( thread, addr - 1, &dummy ) == -1) goto done;
 419             }
 420             if (len && (read_thread_int( thread, addr + len - 1, &dummy ) == -1)) goto done;
 421         }
 422     }
 423     else set_error( STATUS_ACCESS_DENIED );
 424  done:
 425     resume_thread( thread );
 426 }
 427
 428 /* write data to a process memory space */
 429 /* len is the total size (in ints), max is the size we can actually read from the input buffer */
 430 /* we check the total size for write permissions */
 431 static void write_process_memory( struct process *process, int *addr, size_t len,
 432                                   size_t max, unsigned int first_mask,
 433                                   unsigned int last_mask, const int *src )
 434 {
 435     struct thread *thread = process->thread_list;
 436
 437     if (!len || ((unsigned int)addr % sizeof(int)))  /* address must be aligned */
 438     {
 439         set_error( STATUS_INVALID_PARAMETER );
 440         return;
 441     }
 442     suspend_thread( thread, 0 );
 443     if (thread->attached)
 444     {
 445         /* first word is special */
 446         if (len > 1)
 447         {
 448             if (write_thread_int( thread, addr++, *src++, first_mask ) == -1) goto done;
 449             len--;
 450             max--;
 451         }
 452         else last_mask &= first_mask;
 453
 454         while (len > 1 && max)
 455         {
 456             if (write_thread_int( thread, addr++, *src++, ~0 ) == -1) goto done;
 457             max--;
 458             len--;
 459         }
 460
 461         if (max)
 462         {
 463             /* last word is special too */
 464             if (write_thread_int( thread, addr, *src, last_mask ) == -1) goto done;
 465         }
 466         else
 467         {
 468             /* check the rest for write permission */
 469             int page = get_page_size() / sizeof(int);
 470             while (len >= page)
 471             {
 472                 addr += page;
 473                 len -= page;
 474                 if (write_thread_int( thread, addr - 1, 0, 0 ) == -1) goto done;
 475             }
 476             if (len && (write_thread_int( thread, addr + len - 1, 0, 0 ) == -1)) goto done;
 477         }
 478     }
 479     else set_error( STATUS_ACCESS_DENIED );
 480  done:
 481     resume_thread( thread );
 482 }
 483
 484 /* take a snapshot of currently running processes */
 485 struct process_snapshot *process_snap( int *count )
 486 {
 487     struct process_snapshot *snapshot, *ptr;
 488     struct process *process;
 489     if (!running_processes) return NULL;
 490     if (!(snapshot = mem_alloc( sizeof(*snapshot) * running_processes )))
 491         return NULL;
 492     ptr = snapshot;
 493     for (process = first_process; process; process = process->next)
 494     {
 495         if (!process->running_threads) continue;
 496         ptr->process  = process;
 497         ptr->threads  = process->running_threads;
 498         ptr->priority = process->priority;
 499         grab_object( process );
 500         ptr++;
 501     }
 502     *count = running_processes;
 503     return snapshot;
 504 }
 505
 506 /* create a new process */
 507 DECL_HANDLER(new_process)
 508 {
 509     size_t len = get_req_strlen( req->cmdline );
 510     struct thread *thread;
 511     int sock[2];
 512
 513     req->phandle = -1;
 514     req->thandle = -1;
 515     req->pid     = NULL;
 516     req->tid     = NULL;
 517
 518     if (socketpair( AF_UNIX, SOCK_STREAM, 0, sock ) == -1)
 519     {
 520         file_set_error();
 521         return;
 522     }
 523
 524     if ((thread = create_process( sock[0], current->process, req, req->cmdline, len )))
 525     {
 526         int phandle = alloc_handle( current->process, thread->process,
 527                                     PROCESS_ALL_ACCESS, req->inherit );
 528         if ((req->phandle = phandle) != -1)
 529         {
 530             if ((req->thandle = alloc_handle( current->process, thread,
 531                                               THREAD_ALL_ACCESS, req->inherit )) != -1)
 532             {
 533                 /* thread object will be released when the thread gets killed */
 534                 set_reply_fd( current, sock[1] );
 535                 req->pid = thread->process;
 536                 req->tid = thread;
 537                 return;
 538             }
 539             close_handle( current->process, phandle );
 540         }
 541         release_object( thread );
 542     }
 543     close( sock[1] );
 544 }
 545
 546 /* initialize a new process */
 547 DECL_HANDLER(init_process)
 548 {
 549     struct new_process_request *info;
 550
 551     if (!current->unix_pid)
 552     {
 553         fatal_protocol_error( current, "init_process: init_thread not called yet\n" );
 554         return;
 555     }
 556     if (!(info = current->process->info))
 557     {
 558         fatal_protocol_error( current, "init_process: called twice\n" );
 559         return;
 560     }
 561     current->process->ldt_copy  = req->ldt_copy;
 562     current->process->ldt_flags = req->ldt_flags;
 563     current->process->info = NULL;
 564     req->exe_file    = -1;
 565     req->start_flags = info->start_flags;
 566     req->hstdin      = info->hstdin;
 567     req->hstdout     = info->hstdout;
 568     req->hstderr     = info->hstderr;
 569     req->cmd_show    = info->cmd_show;
 570     req->env_ptr     = info->env_ptr;
 571     strcpy( req->cmdline, info->cmdline );
 572     if (current->process->exe_file)
 573         req->exe_file = alloc_handle( current->process, current->process->exe_file,
 574                                       GENERIC_READ, 0 );
 575     free( info );
 576 }
 577
 578 /* signal the end of the process initialization */
 579 DECL_HANDLER(init_process_done)
 580 {
 581     struct process *process = current->process;
 582     if (!process->init_event)
 583     {
 584         fatal_protocol_error( current, "init_process_done: no event\n" );
 585         return;
 586     }
 587     set_event( process->init_event );
 588     release_object( process->init_event );
 589     process->init_event = NULL;
 590     if (current->suspend + current->process->suspend > 0) stop_thread( current );
 591 }
 592
 593 /* open a handle to a process */
 594 DECL_HANDLER(open_process)
 595 {
 596     struct process *process = get_process_from_id( req->pid );
 597     req->handle = -1;
 598     if (process)
 599     {
 600         req->handle = alloc_handle( current->process, process, req->access, req->inherit );
 601         release_object( process );
 602     }
 603 }
 604
 605 /* terminate a process */
 606 DECL_HANDLER(terminate_process)
 607 {
 608     struct process *process;
 609
 610     if ((process = get_process_from_handle( req->handle, PROCESS_TERMINATE )))
 611     {
 612         kill_process( process, req->exit_code );
 613         release_object( process );
 614     }
 615 }
 616
 617 /* fetch information about a process */
 618 DECL_HANDLER(get_process_info)
 619 {
 620     struct process *process;
 621
 622     if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION )))
 623     {
 624         get_process_info( process, req );
 625         release_object( process );
 626     }
 627 }
 628
 629 /* set information about a process */
 630 DECL_HANDLER(set_process_info)
 631 {
 632     struct process *process;
 633
 634     if ((process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION )))
 635     {
 636         set_process_info( process, req );
 637         release_object( process );
 638     }
 639 }
 640
 641 /* read data from a process address space */
 642 DECL_HANDLER(read_process_memory)
 643 {
 644     struct process *process;
 645
 646     if ((process = get_process_from_handle( req->handle, PROCESS_VM_READ )))
 647     {
 648         read_process_memory( process, req->addr, req->len,
 649                              get_req_size( req->data, sizeof(int) ), req->data );
 650         release_object( process );
 651     }
 652 }
 653
 654 /* write data to a process address space */
 655 DECL_HANDLER(write_process_memory)
 656 {
 657     struct process *process;
 658
 659     if ((process = get_process_from_handle( req->handle, PROCESS_VM_WRITE )))
 660     {
 661         write_process_memory( process, req->addr, req->len, get_req_size( req->data, sizeof(int) ),
 662                               req->first_mask, req->last_mask, req->data );
 663         release_object( process );
 664     }
 665 }