server/snapshot.c

   1 /*
   2  * Server-side snapshots
   3  *
   4  * Copyright (C) 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * FIXME: heap snapshots not implemented
  21  */
  22
  23 #include <assert.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26
  27 #include "windef.h"
  28 #include "tlhelp32.h"
  29
  30 #include "handle.h"
  31 #include "process.h"
  32 #include "thread.h"
  33 #include "request.h"
  34
  35
  36 struct snapshot
  37 {
  38     struct object             obj;           /* object header */
  39     struct process           *process;       /* process of this snapshot (for modules and heaps) */
  40     struct process_snapshot  *processes;     /* processes snapshot */
  41     int                       process_count; /* count of processes */
  42     int                       process_pos;   /* current position in proc snapshot */
  43     struct thread_snapshot   *threads;       /* threads snapshot */
  44     int                       thread_count;  /* count of threads */
  45     int                       thread_pos;    /* current position in thread snapshot */
  46     struct module_snapshot   *modules;       /* modules snapshot */
  47     int                       module_count;  /* count of modules */
  48     int                       module_pos;    /* current position in module snapshot */
  49 };
  50
  51 static void snapshot_dump( struct object *obj, int verbose );
  52 static void snapshot_destroy( struct object *obj );
  53
  54 static const struct object_ops snapshot_ops =
  55 {
  56     sizeof(struct snapshot),      /* size */
  57     snapshot_dump,                /* dump */
  58     no_add_queue,                 /* add_queue */
  59     NULL,                         /* remove_queue */
  60     NULL,                         /* signaled */
  61     NULL,                         /* satisfied */
  62     NULL,                         /* get_poll_events */
  63     NULL,                         /* poll_event */
  64     no_get_fd,                    /* get_fd */
  65     no_flush,                     /* flush */
  66     no_get_file_info,             /* get_file_info */
  67     NULL,                         /* queue_async */
  68     snapshot_destroy              /* destroy */
  69 };
  70
  71
  72 /* create a new snapshot */
  73 static struct snapshot *create_snapshot( void *pid, int flags )
  74 {
  75     struct process *process = NULL;
  76     struct snapshot *snapshot;
  77
  78     /* need a process for modules and heaps */
  79     if (flags & (TH32CS_SNAPMODULE|TH32CS_SNAPHEAPLIST))
  80     {
  81         if (!pid) process = (struct process *)grab_object( current->process );
  82         else if (!(process = get_process_from_id( pid ))) return NULL;
  83     }
  84
  85     if (!(snapshot = alloc_object( &snapshot_ops, -1 )))
  86     {
  87         if (process) release_object( process );
  88         return NULL;
  89     }
  90
  91     snapshot->process = process;
  92
  93     snapshot->process_pos = 0;
  94     snapshot->process_count = 0;
  95     if (flags & TH32CS_SNAPPROCESS)
  96         snapshot->processes = process_snap( &snapshot->process_count );
  97
  98     snapshot->thread_pos = 0;
  99     snapshot->thread_count = 0;
 100     if (flags & TH32CS_SNAPTHREAD)
 101         snapshot->threads = thread_snap( &snapshot->thread_count );
 102
 103     snapshot->module_pos = 0;
 104     snapshot->module_count = 0;
 105     if (flags & TH32CS_SNAPMODULE)
 106         snapshot->modules = module_snap( process, &snapshot->module_count );
 107
 108     return snapshot;
 109 }
 110
 111 /* get the next process in the snapshot */
 112 static int snapshot_next_process( struct snapshot *snapshot, struct next_process_reply *reply )
 113 {
 114     struct process_snapshot *ptr;
 115
 116     if (!snapshot->process_count)
 117     {
 118         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 119         return 0;
 120     }
 121     if (snapshot->process_pos >= snapshot->process_count)
 122     {
 123         set_error( STATUS_NO_MORE_FILES );
 124         return 0;
 125     }
 126     ptr = &snapshot->processes[snapshot->process_pos++];
 127     reply->count    = ptr->count;
 128     reply->pid      = get_process_id( ptr->process );
 129     reply->ppid     = get_process_id( ptr->process->parent );
 130     reply->heap     = 0;  /* FIXME */
 131     reply->module   = 0;  /* FIXME */
 132     reply->threads  = ptr->threads;
 133     reply->priority = ptr->priority;
 134     if (ptr->process->exe.filename)
 135     {
 136         size_t len = min( ptr->process->exe.namelen, get_reply_max_size() );
 137         set_reply_data( ptr->process->exe.filename, len );
 138     }
 139     return 1;
 140 }
 141
 142 /* get the next thread in the snapshot */
 143 static int snapshot_next_thread( struct snapshot *snapshot, struct next_thread_reply *reply )
 144 {
 145     struct thread_snapshot *ptr;
 146
 147     if (!snapshot->thread_count)
 148     {
 149         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 150         return 0;
 151     }
 152     if (snapshot->thread_pos >= snapshot->thread_count)
 153     {
 154         set_error( STATUS_NO_MORE_FILES );
 155         return 0;
 156     }
 157     ptr = &snapshot->threads[snapshot->thread_pos++];
 158     reply->count     = ptr->count;
 159     reply->pid       = get_process_id( ptr->thread->process );
 160     reply->tid       = get_thread_id( ptr->thread );
 161     reply->base_pri  = ptr->priority;
 162     reply->delta_pri = 0;  /* FIXME */
 163     return 1;
 164 }
 165
 166 /* get the next module in the snapshot */
 167 static int snapshot_next_module( struct snapshot *snapshot, struct next_module_reply *reply )
 168 {
 169     struct module_snapshot *ptr;
 170
 171     if (!snapshot->module_count)
 172     {
 173         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 174         return 0;
 175     }
 176     if (snapshot->module_pos >= snapshot->module_count)
 177     {
 178         set_error( STATUS_NO_MORE_FILES );
 179         return 0;
 180     }
 181     ptr = &snapshot->modules[snapshot->module_pos++];
 182     reply->pid  = get_process_id( snapshot->process );
 183     reply->base = ptr->base;
 184     reply->size = ptr->size;
 185     if (ptr->filename)
 186     {
 187         size_t len = min( ptr->namelen, get_reply_max_size() );
 188         set_reply_data( ptr->filename, len );
 189     }
 190     return 1;
 191 }
 192
 193 static void snapshot_dump( struct object *obj, int verbose )
 194 {
 195     struct snapshot *snapshot = (struct snapshot *)obj;
 196     assert( obj->ops == &snapshot_ops );
 197     fprintf( stderr, "Snapshot: %d procs %d threads %d modules\n",
 198              snapshot->process_count, snapshot->thread_count, snapshot->module_count );
 199 }
 200
 201 static void snapshot_destroy( struct object *obj )
 202 {
 203     int i;
 204     struct snapshot *snapshot = (struct snapshot *)obj;
 205     assert( obj->ops == &snapshot_ops );
 206     if (snapshot->process_count)
 207     {
 208         for (i = 0; i < snapshot->process_count; i++)
 209             release_object( snapshot->processes[i].process );
 210         free( snapshot->processes );
 211     }
 212     if (snapshot->thread_count)
 213     {
 214         for (i = 0; i < snapshot->thread_count; i++)
 215             release_object( snapshot->threads[i].thread );
 216         free( snapshot->threads );
 217     }
 218     if (snapshot->module_count)
 219     {
 220         for (i = 0; i < snapshot->module_count; i++)
 221             free( snapshot->modules[i].filename );
 222         free( snapshot->modules );
 223     }
 224     if (snapshot->process) release_object( snapshot->process );
 225 }
 226
 227 /* create a snapshot */
 228 DECL_HANDLER(create_snapshot)
 229 {
 230     struct snapshot *snapshot;
 231
 232     reply->handle = 0;
 233     if ((snapshot = create_snapshot( req->pid, req->flags )))
 234     {
 235         reply->handle = alloc_handle( current->process, snapshot, 0, req->inherit );
 236         release_object( snapshot );
 237     }
 238 }
 239
 240 /* get the next process from a snapshot */
 241 DECL_HANDLER(next_process)
 242 {
 243     struct snapshot *snapshot;
 244
 245     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 246                                                        0, &snapshot_ops )))
 247     {
 248         if (req->reset) snapshot->process_pos = 0;
 249         snapshot_next_process( snapshot, reply );
 250         release_object( snapshot );
 251     }
 252 }
 253
 254 /* get the next thread from a snapshot */
 255 DECL_HANDLER(next_thread)
 256 {
 257     struct snapshot *snapshot;
 258
 259     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 260                                                        0, &snapshot_ops )))
 261     {
 262         if (req->reset) snapshot->thread_pos = 0;
 263         snapshot_next_thread( snapshot, reply );
 264         release_object( snapshot );
 265     }
 266 }
 267
 268 /* get the next module from a snapshot */
 269 DECL_HANDLER(next_module)
 270 {
 271     struct snapshot *snapshot;
 272
 273     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 274                                                        0, &snapshot_ops )))
 275     {
 276         if (req->reset) snapshot->module_pos = 0;
 277         snapshot_next_module( snapshot, reply );
 278         release_object( snapshot );
 279     }
 280 }