server/process.c

   1 /*
   2  * Server-side process management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <limits.h>
   9 #include <signal.h>
  10 #include <string.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <sys/time.h>
  14 #include <unistd.h>
  15
  16 #include "winerror.h"
  17 #include "winbase.h"
  18 #include "winnt.h"
  19
  20 #include "handle.h"
  21 #include "process.h"
  22 #include "thread.h"
  23 #include "request.h"
  24
  25 /* process structure */
  26
  27 static struct process *first_process;
  28 static int running_processes;
  29
  30 /* process operations */
  31
  32 static void process_dump( struct object *obj, int verbose );
  33 static int process_signaled( struct object *obj, struct thread *thread );
  34 static void process_destroy( struct object *obj );
  35
  36 static const struct object_ops process_ops =
  37 {
  38     sizeof(struct process),
  39     process_dump,
  40     add_queue,
  41     remove_queue,
  42     process_signaled,
  43     no_satisfied,
  44     no_read_fd,
  45     no_write_fd,
  46     no_flush,
  47     no_get_file_info,
  48     process_destroy
  49 };
  50
  51
  52 /* create a new process */
  53 static struct process *create_process( struct process *parent, struct new_process_request *req,
  54                                        const char *cmd_line, size_t len )
  55 {
  56     struct process *process;
  57
  58     if (!(process = alloc_object( &process_ops ))) return NULL;
  59     process->next            = NULL;
  60     process->prev            = NULL;
  61     process->thread_list     = NULL;
  62     process->debug_next      = NULL;
  63     process->debug_prev      = NULL;
  64     process->debugger        = NULL;
  65     process->handles         = NULL;
  66     process->exit_code       = 0x103;  /* STILL_ACTIVE */
  67     process->running_threads = 0;
  68     process->priority        = NORMAL_PRIORITY_CLASS;
  69     process->affinity        = 1;
  70     process->suspend         = 0;
  71     process->console_in      = NULL;
  72     process->console_out     = NULL;
  73     process->info            = NULL;
  74     gettimeofday( &process->start_time, NULL );
  75
  76     if (req->inherit_all)
  77         process->handles = copy_handle_table( process, parent );
  78     else
  79         process->handles = alloc_handle_table( process, 0 );
  80     if (!process->handles) goto error;
  81
  82     /* alloc a handle for the process itself */
  83     alloc_handle( process, process, PROCESS_ALL_ACCESS, 0 );
  84
  85     if (!(process->info = mem_alloc( sizeof(*process->info) + len ))) goto error;
  86     memcpy( process->info, req, sizeof(*req) );
  87     memcpy( process->info->cmdline, cmd_line, len );
  88     process->info->cmdline[len] = 0;
  89
  90     /* set the process console */
  91     if (req->create_flags & CREATE_NEW_CONSOLE)
  92     {
  93         if (!alloc_console( process )) goto error;
  94     }
  95     else if (!(req->create_flags & DETACHED_PROCESS))
  96     {
  97         if (parent->console_in) process->console_in = grab_object( parent->console_in );
  98         if (parent->console_out) process->console_out = grab_object( parent->console_out );
  99     }
 100
 101     if (!req->inherit_all && !(req->start_flags & STARTF_USESTDHANDLES))
 102     {
 103         process->info->hstdin  = duplicate_handle( parent, req->hstdin, process,
 104                                                    0, TRUE, DUPLICATE_SAME_ACCESS );
 105         process->info->hstdout = duplicate_handle( parent, req->hstdout, process,
 106                                                    0, TRUE, DUPLICATE_SAME_ACCESS );
 107         process->info->hstderr = duplicate_handle( parent, req->hstderr, process,
 108                                                    0, TRUE, DUPLICATE_SAME_ACCESS );
 109     }
 110
 111     /* attach to the debugger if requested */
 112     if (req->create_flags & DEBUG_PROCESS)
 113         debugger_attach( process, current );
 114     else if (parent && parent->debugger && !(req->create_flags & DEBUG_ONLY_THIS_PROCESS))
 115         debugger_attach( process, parent->debugger );
 116
 117     if ((process->next = first_process) != NULL) process->next->prev = process;
 118     first_process = process;
 119     return process;
 120
 121  error:
 122     free_console( process );
 123     if (process->info) free( process->info );
 124     if (process->handles) release_object( process->handles );
 125     release_object( process );
 126     return NULL;
 127 }
 128
 129 /* create the initial process */
 130 struct process *create_initial_process(void)
 131 {
 132     struct process *process;
 133     struct new_process_request req;
 134
 135     req.inherit      = 0;
 136     req.inherit_all  = 0;
 137     req.create_flags = CREATE_NEW_CONSOLE;
 138     req.start_flags  = STARTF_USESTDHANDLES;
 139     req.hstdin       = -1;
 140     req.hstdout      = -1;
 141     req.hstderr      = -1;
 142     req.cmd_show     = 0;
 143     req.env_ptr      = NULL;
 144     if ((process = create_process( NULL, &req, "", 1 )))
 145     {
 146         process->info->hstdin  = alloc_handle( process, process->console_in,
 147                                                GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
 148         process->info->hstdout = alloc_handle( process, process->console_out,
 149                                                GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
 150         process->info->hstderr = alloc_handle( process, process->console_out,
 151                                                GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
 152     }
 153     return process;
 154 }
 155
 156 /* destroy a process when its refcount is 0 */
 157 static void process_destroy( struct object *obj )
 158 {
 159     struct process *process = (struct process *)obj;
 160     assert( obj->ops == &process_ops );
 161
 162     /* we can't have a thread remaining */
 163     assert( !process->thread_list );
 164     if (process->next) process->next->prev = process->prev;
 165     if (process->prev) process->prev->next = process->next;
 166     else first_process = process->next;
 167     if (process->info) free( process->info );
 168 }
 169
 170 /* dump a process on stdout for debugging purposes */
 171 static void process_dump( struct object *obj, int verbose )
 172 {
 173     struct process *process = (struct process *)obj;
 174     assert( obj->ops == &process_ops );
 175
 176     fprintf( stderr, "Process next=%p prev=%p console=%p/%p handles=%p\n",
 177              process->next, process->prev, process->console_in, process->console_out,
 178              process->handles );
 179 }
 180
 181 static int process_signaled( struct object *obj, struct thread *thread )
 182 {
 183     struct process *process = (struct process *)obj;
 184     return !process->running_threads;
 185 }
 186
 187
 188 /* get a process from an id (and increment the refcount) */
 189 struct process *get_process_from_id( void *id )
 190 {
 191     struct process *p = first_process;
 192     while (p && (p != id)) p = p->next;
 193     if (p) grab_object( p );
 194     else set_error( ERROR_INVALID_PARAMETER );
 195     return p;
 196 }
 197
 198 /* get a process from a handle (and increment the refcount) */
 199 struct process *get_process_from_handle( int handle, unsigned int access )
 200 {
 201     return (struct process *)get_handle_obj( current->process, handle,
 202                                              access, &process_ops );
 203 }
 204
 205 /* a process has been killed (i.e. its last thread died) */
 206 static void process_killed( struct process *process, int exit_code )
 207 {
 208     assert( !process->thread_list );
 209     process->exit_code = exit_code;
 210     gettimeofday( &process->end_time, NULL );
 211     release_object( process->handles );
 212     process->handles = NULL;
 213     free_console( process );
 214     wake_up( &process->obj, 0 );
 215     if (!--running_processes)
 216     {
 217         /* last process died, close global handles */
 218         close_global_handles();
 219     }
 220 }
 221
 222 /* add a thread to a process running threads list */
 223 void add_process_thread( struct process *process, struct thread *thread )
 224 {
 225     thread->proc_next = process->thread_list;
 226     thread->proc_prev = NULL;
 227     if (thread->proc_next) thread->proc_next->proc_prev = thread;
 228     process->thread_list = thread;
 229     if (!process->running_threads++) running_processes++;
 230     grab_object( thread );
 231 }
 232
 233 /* remove a thread from a process running threads list */
 234 void remove_process_thread( struct process *process, struct thread *thread )
 235 {
 236     assert( process->running_threads > 0 );
 237     assert( process->thread_list );
 238
 239     if (thread->proc_next) thread->proc_next->proc_prev = thread->proc_prev;
 240     if (thread->proc_prev) thread->proc_prev->proc_next = thread->proc_next;
 241     else process->thread_list = thread->proc_next;
 242
 243     if (!--process->running_threads)
 244     {
 245         /* we have removed the last running thread, exit the process */
 246         process_killed( process, thread->exit_code );
 247     }
 248     release_object( thread );
 249 }
 250
 251 /* suspend all the threads of a process */
 252 void suspend_process( struct process *process )
 253 {
 254     if (!process->suspend++)
 255     {
 256         struct thread *thread = process->thread_list;
 257         for (; thread; thread = thread->proc_next)
 258         {
 259             if (!thread->suspend) stop_thread( thread );
 260         }
 261     }
 262 }
 263
 264 /* resume all the threads of a process */
 265 void resume_process( struct process *process )
 266 {
 267     assert (process->suspend > 0);
 268     if (!--process->suspend)
 269     {
 270         struct thread *thread = process->thread_list;
 271         for (; thread; thread = thread->proc_next)
 272         {
 273             if (!thread->suspend) continue_thread( thread );
 274         }
 275     }
 276 }
 277
 278 /* kill a process on the spot */
 279 void kill_process( struct process *process, int exit_code )
 280 {
 281     while (process->thread_list)
 282         kill_thread( process->thread_list, exit_code );
 283 }
 284
 285 /* get all information about a process */
 286 static void get_process_info( struct process *process, struct get_process_info_request *req )
 287 {
 288     req->pid              = process;
 289     req->exit_code        = process->exit_code;
 290     req->priority         = process->priority;
 291     req->process_affinity = process->affinity;
 292     req->system_affinity  = 1;
 293 }
 294
 295 /* set all information about a process */
 296 static void set_process_info( struct process *process,
 297                               struct set_process_info_request *req )
 298 {
 299     if (req->mask & SET_PROCESS_INFO_PRIORITY)
 300         process->priority = req->priority;
 301     if (req->mask & SET_PROCESS_INFO_AFFINITY)
 302     {
 303         if (req->affinity != 1) set_error( ERROR_INVALID_PARAMETER );
 304         else process->affinity = req->affinity;
 305     }
 306 }
 307
 308 /* take a snapshot of currently running processes */
 309 struct process_snapshot *process_snap( int *count )
 310 {
 311     struct process_snapshot *snapshot, *ptr;
 312     struct process *process;
 313     if (!running_processes) return NULL;
 314     if (!(snapshot = mem_alloc( sizeof(*snapshot) * running_processes )))
 315         return NULL;
 316     ptr = snapshot;
 317     for (process = first_process; process; process = process->next)
 318     {
 319         if (!process->running_threads) continue;
 320         ptr->process  = process;
 321         ptr->threads  = process->running_threads;
 322         ptr->priority = process->priority;
 323         grab_object( process );
 324         ptr++;
 325     }
 326     *count = running_processes;
 327     return snapshot;
 328 }
 329
 330 /* create a new process */
 331 DECL_HANDLER(new_process)
 332 {
 333     size_t len = get_req_strlen( req->cmdline );
 334     struct process *process;
 335
 336     req->handle = -1;
 337     req->pid    = NULL;
 338     if ((process = create_process( current->process, req, req->cmdline, len )))
 339     {
 340         req->handle = alloc_handle( current->process, process, PROCESS_ALL_ACCESS, req->inherit );
 341         req->pid    = process;
 342         release_object( process );
 343     }
 344 }
 345
 346 /* initialize a new process */
 347 DECL_HANDLER(init_process)
 348 {
 349     struct new_process_request *info;
 350
 351     if (!current->unix_pid)
 352     {
 353         fatal_protocol_error( current, "init_process: init_thread not called yet\n" );
 354         return;
 355     }
 356     if (!(info = current->process->info))
 357     {
 358         fatal_protocol_error( current, "init_process: called twice\n" );
 359         return;
 360     }
 361     current->process->info = NULL;
 362     req->start_flags = info->start_flags;
 363     req->hstdin      = info->hstdin;
 364     req->hstdout     = info->hstdout;
 365     req->hstderr     = info->hstderr;
 366     req->cmd_show    = info->cmd_show;
 367     req->env_ptr     = info->env_ptr;
 368     strcpy( req->cmdline, info->cmdline );
 369     free( info );
 370 }
 371
 372 /* open a handle to a process */
 373 DECL_HANDLER(open_process)
 374 {
 375     struct process *process = get_process_from_id( req->pid );
 376     req->handle = -1;
 377     if (process)
 378     {
 379         req->handle = alloc_handle( current->process, process, req->access, req->inherit );
 380         release_object( process );
 381     }
 382 }
 383
 384 /* terminate a process */
 385 DECL_HANDLER(terminate_process)
 386 {
 387     struct process *process;
 388
 389     if ((process = get_process_from_handle( req->handle, PROCESS_TERMINATE )))
 390     {
 391         kill_process( process, req->exit_code );
 392         release_object( process );
 393     }
 394 }
 395
 396 /* fetch information about a process */
 397 DECL_HANDLER(get_process_info)
 398 {
 399     struct process *process;
 400
 401     if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION )))
 402     {
 403         get_process_info( process, req );
 404         release_object( process );
 405     }
 406 }
 407
 408 /* set information about a process */
 409 DECL_HANDLER(set_process_info)
 410 {
 411     struct process *process;
 412
 413     if ((process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION )))
 414     {
 415         set_process_info( process, req );
 416         release_object( process );
 417     }
 418 }