server/snapshot.c

   1 /*
   2  * Server-side snapshots
   3  *
   4  * Copyright (C) 1999 Alexandre Julliard
   5  *
   6  * FIXME: heap snapshots not implemented
   7  */
   8
   9 #include <assert.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12
  13 #include "windef.h"
  14 #include "tlhelp32.h"
  15
  16 #include "handle.h"
  17 #include "process.h"
  18 #include "thread.h"
  19 #include "request.h"
  20
  21
  22 struct snapshot
  23 {
  24     struct object             obj;           /* object header */
  25     struct process           *process;       /* process of this snapshot (for modules and heaps) */
  26     struct process_snapshot  *processes;     /* processes snapshot */
  27     int                       process_count; /* count of processes */
  28     int                       process_pos;   /* current position in proc snapshot */
  29     struct thread_snapshot   *threads;       /* threads snapshot */
  30     int                       thread_count;  /* count of threads */
  31     int                       thread_pos;    /* current position in thread snapshot */
  32     struct module_snapshot   *modules;       /* modules snapshot */
  33     int                       module_count;  /* count of modules */
  34     int                       module_pos;    /* current position in module snapshot */
  35 };
  36
  37 static void snapshot_dump( struct object *obj, int verbose );
  38 static void snapshot_destroy( struct object *obj );
  39
  40 static const struct object_ops snapshot_ops =
  41 {
  42     sizeof(struct snapshot),      /* size */
  43     snapshot_dump,                /* dump */
  44     no_add_queue,                 /* add_queue */
  45     NULL,                         /* remove_queue */
  46     NULL,                         /* signaled */
  47     NULL,                         /* satisfied */
  48     NULL,                         /* get_poll_events */
  49     NULL,                         /* poll_event */
  50     no_get_fd,                    /* get_fd */
  51     no_flush,                     /* flush */
  52     no_get_file_info,             /* get_file_info */
  53     NULL,                         /* queue_async */
  54     snapshot_destroy              /* destroy */
  55 };
  56
  57
  58 /* create a new snapshot */
  59 static struct snapshot *create_snapshot( void *pid, int flags )
  60 {
  61     struct process *process = NULL;
  62     struct snapshot *snapshot;
  63
  64     /* need a process for modules and heaps */
  65     if (flags & (TH32CS_SNAPMODULE|TH32CS_SNAPHEAPLIST))
  66     {
  67         if (!pid) process = (struct process *)grab_object( current->process );
  68         else if (!(process = get_process_from_id( pid ))) return NULL;
  69     }
  70
  71     if (!(snapshot = alloc_object( &snapshot_ops, -1 )))
  72     {
  73         if (process) release_object( process );
  74         return NULL;
  75     }
  76
  77     snapshot->process = process;
  78
  79     snapshot->process_pos = 0;
  80     snapshot->process_count = 0;
  81     if (flags & TH32CS_SNAPPROCESS)
  82         snapshot->processes = process_snap( &snapshot->process_count );
  83
  84     snapshot->thread_pos = 0;
  85     snapshot->thread_count = 0;
  86     if (flags & TH32CS_SNAPTHREAD)
  87         snapshot->threads = thread_snap( &snapshot->thread_count );
  88
  89     snapshot->module_pos = 0;
  90     snapshot->module_count = 0;
  91     if (flags & TH32CS_SNAPMODULE)
  92         snapshot->modules = module_snap( process, &snapshot->module_count );
  93
  94     return snapshot;
  95 }
  96
  97 /* get the next process in the snapshot */
  98 static int snapshot_next_process( struct snapshot *snapshot, struct next_process_reply *reply )
  99 {
 100     struct process_snapshot *ptr;
 101
 102     if (!snapshot->process_count)
 103     {
 104         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 105         return 0;
 106     }
 107     if (snapshot->process_pos >= snapshot->process_count)
 108     {
 109         set_error( STATUS_NO_MORE_FILES );
 110         return 0;
 111     }
 112     ptr = &snapshot->processes[snapshot->process_pos++];
 113     reply->count    = ptr->count;
 114     reply->pid      = get_process_id( ptr->process );
 115     reply->threads  = ptr->threads;
 116     reply->priority = ptr->priority;
 117     return 1;
 118 }
 119
 120 /* get the next thread in the snapshot */
 121 static int snapshot_next_thread( struct snapshot *snapshot, struct next_thread_reply *reply )
 122 {
 123     struct thread_snapshot *ptr;
 124
 125     if (!snapshot->thread_count)
 126     {
 127         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 128         return 0;
 129     }
 130     if (snapshot->thread_pos >= snapshot->thread_count)
 131     {
 132         set_error( STATUS_NO_MORE_FILES );
 133         return 0;
 134     }
 135     ptr = &snapshot->threads[snapshot->thread_pos++];
 136     reply->count     = ptr->count;
 137     reply->pid       = get_process_id( ptr->thread->process );
 138     reply->tid       = get_thread_id( ptr->thread );
 139     reply->base_pri  = ptr->priority;
 140     reply->delta_pri = 0;  /* FIXME */
 141     return 1;
 142 }
 143
 144 /* get the next module in the snapshot */
 145 static int snapshot_next_module( struct snapshot *snapshot, struct next_module_reply *reply )
 146 {
 147     struct module_snapshot *ptr;
 148
 149     if (!snapshot->module_count)
 150     {
 151         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 152         return 0;
 153     }
 154     if (snapshot->module_pos >= snapshot->module_count)
 155     {
 156         set_error( STATUS_NO_MORE_FILES );
 157         return 0;
 158     }
 159     ptr = &snapshot->modules[snapshot->module_pos++];
 160     reply->pid  = get_process_id( snapshot->process );
 161     reply->base = ptr->base;
 162     return 1;
 163 }
 164
 165 static void snapshot_dump( struct object *obj, int verbose )
 166 {
 167     struct snapshot *snapshot = (struct snapshot *)obj;
 168     assert( obj->ops == &snapshot_ops );
 169     fprintf( stderr, "Snapshot: %d procs %d threads %d modules\n",
 170              snapshot->process_count, snapshot->thread_count, snapshot->module_count );
 171 }
 172
 173 static void snapshot_destroy( struct object *obj )
 174 {
 175     int i;
 176     struct snapshot *snapshot = (struct snapshot *)obj;
 177     assert( obj->ops == &snapshot_ops );
 178     if (snapshot->process_count)
 179     {
 180         for (i = 0; i < snapshot->process_count; i++)
 181             release_object( snapshot->processes[i].process );
 182         free( snapshot->processes );
 183     }
 184     if (snapshot->thread_count)
 185     {
 186         for (i = 0; i < snapshot->thread_count; i++)
 187             release_object( snapshot->threads[i].thread );
 188         free( snapshot->threads );
 189     }
 190     if (snapshot->module_count) free( snapshot->modules );
 191     if (snapshot->process) release_object( snapshot->process );
 192 }
 193
 194 /* create a snapshot */
 195 DECL_HANDLER(create_snapshot)
 196 {
 197     struct snapshot *snapshot;
 198
 199     reply->handle = 0;
 200     if ((snapshot = create_snapshot( req->pid, req->flags )))
 201     {
 202         reply->handle = alloc_handle( current->process, snapshot, 0, req->inherit );
 203         release_object( snapshot );
 204     }
 205 }
 206
 207 /* get the next process from a snapshot */
 208 DECL_HANDLER(next_process)
 209 {
 210     struct snapshot *snapshot;
 211
 212     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 213                                                        0, &snapshot_ops )))
 214     {
 215         if (req->reset) snapshot->process_pos = 0;
 216         snapshot_next_process( snapshot, reply );
 217         release_object( snapshot );
 218     }
 219 }
 220
 221 /* get the next thread from a snapshot */
 222 DECL_HANDLER(next_thread)
 223 {
 224     struct snapshot *snapshot;
 225
 226     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 227                                                        0, &snapshot_ops )))
 228     {
 229         if (req->reset) snapshot->thread_pos = 0;
 230         snapshot_next_thread( snapshot, reply );
 231         release_object( snapshot );
 232     }
 233 }
 234
 235 /* get the next module from a snapshot */
 236 DECL_HANDLER(next_module)
 237 {
 238     struct snapshot *snapshot;
 239
 240     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 241                                                        0, &snapshot_ops )))
 242     {
 243         if (req->reset) snapshot->module_pos = 0;
 244         snapshot_next_module( snapshot, reply );
 245         release_object( snapshot );
 246     }
 247 }