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     snapshot_destroy              /* destroy */
  54 };
  55
  56
  57 /* create a new snapshot */
  58 static struct snapshot *create_snapshot( void *pid, int flags )
  59 {
  60     struct process *process = NULL;
  61     struct snapshot *snapshot;
  62
  63     /* need a process for modules and heaps */
  64     if (flags & (TH32CS_SNAPMODULE|TH32CS_SNAPHEAPLIST))
  65     {
  66         if (!pid) process = (struct process *)grab_object( current->process );
  67         else if (!(process = get_process_from_id( pid ))) return NULL;
  68     }
  69
  70     if (!(snapshot = alloc_object( &snapshot_ops, -1 )))
  71     {
  72         if (process) release_object( process );
  73         return NULL;
  74     }
  75
  76     snapshot->process = process;
  77
  78     snapshot->process_pos = 0;
  79     snapshot->process_count = 0;
  80     if (flags & TH32CS_SNAPPROCESS)
  81         snapshot->processes = process_snap( &snapshot->process_count );
  82
  83     snapshot->thread_pos = 0;
  84     snapshot->thread_count = 0;
  85     if (flags & TH32CS_SNAPTHREAD)
  86         snapshot->threads = thread_snap( &snapshot->thread_count );
  87
  88     snapshot->module_pos = 0;
  89     snapshot->module_count = 0;
  90     if (flags & TH32CS_SNAPMODULE)
  91         snapshot->modules = module_snap( process, &snapshot->module_count );
  92
  93     return snapshot;
  94 }
  95
  96 /* get the next process in the snapshot */
  97 static int snapshot_next_process( struct snapshot *snapshot, struct next_process_request *req )
  98 {
  99     struct process_snapshot *ptr;
 100
 101     if (!snapshot->process_count)
 102     {
 103         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 104         return 0;
 105     }
 106     if (req->reset) snapshot->process_pos = 0;
 107     else 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     req->count    = ptr->count;
 114     req->pid      = get_process_id( ptr->process );
 115     req->threads  = ptr->threads;
 116     req->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_request *req )
 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 (req->reset) snapshot->thread_pos = 0;
 131     else if (snapshot->thread_pos >= snapshot->thread_count)
 132     {
 133         set_error( STATUS_NO_MORE_FILES );
 134         return 0;
 135     }
 136     ptr = &snapshot->threads[snapshot->thread_pos++];
 137     req->count     = ptr->count;
 138     req->pid       = get_process_id( ptr->thread->process );
 139     req->tid       = get_thread_id( ptr->thread );
 140     req->base_pri  = ptr->priority;
 141     req->delta_pri = 0;  /* FIXME */
 142     return 1;
 143 }
 144
 145 /* get the next module in the snapshot */
 146 static int snapshot_next_module( struct snapshot *snapshot, struct next_module_request *req )
 147 {
 148     struct module_snapshot *ptr;
 149
 150     if (!snapshot->module_count)
 151     {
 152         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 153         return 0;
 154     }
 155     if (req->reset) snapshot->module_pos = 0;
 156     else if (snapshot->module_pos >= snapshot->module_count)
 157     {
 158         set_error( STATUS_NO_MORE_FILES );
 159         return 0;
 160     }
 161     ptr = &snapshot->modules[snapshot->module_pos++];
 162     req->pid  = get_process_id( snapshot->process );
 163     req->base = ptr->base;
 164     return 1;
 165 }
 166
 167 static void snapshot_dump( struct object *obj, int verbose )
 168 {
 169     struct snapshot *snapshot = (struct snapshot *)obj;
 170     assert( obj->ops == &snapshot_ops );
 171     fprintf( stderr, "Snapshot: %d procs %d threads %d modules\n",
 172              snapshot->process_count, snapshot->thread_count, snapshot->module_count );
 173 }
 174
 175 static void snapshot_destroy( struct object *obj )
 176 {
 177     int i;
 178     struct snapshot *snapshot = (struct snapshot *)obj;
 179     assert( obj->ops == &snapshot_ops );
 180     if (snapshot->process_count)
 181     {
 182         for (i = 0; i < snapshot->process_count; i++)
 183             release_object( snapshot->processes[i].process );
 184         free( snapshot->processes );
 185     }
 186     if (snapshot->thread_count)
 187     {
 188         for (i = 0; i < snapshot->thread_count; i++)
 189             release_object( snapshot->threads[i].thread );
 190         free( snapshot->threads );
 191     }
 192     if (snapshot->module_count) free( snapshot->modules );
 193     if (snapshot->process) release_object( snapshot->process );
 194 }
 195
 196 /* create a snapshot */
 197 DECL_HANDLER(create_snapshot)
 198 {
 199     struct snapshot *snapshot;
 200
 201     req->handle = -1;
 202     if ((snapshot = create_snapshot( req->pid, req->flags )))
 203     {
 204         req->handle = alloc_handle( current->process, snapshot, 0, req->inherit );
 205         release_object( snapshot );
 206     }
 207 }
 208
 209 /* get the next process from a snapshot */
 210 DECL_HANDLER(next_process)
 211 {
 212     struct snapshot *snapshot;
 213
 214     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 215                                                        0, &snapshot_ops )))
 216     {
 217         snapshot_next_process( snapshot, req );
 218         release_object( snapshot );
 219     }
 220 }
 221
 222 /* get the next thread from a snapshot */
 223 DECL_HANDLER(next_thread)
 224 {
 225     struct snapshot *snapshot;
 226
 227     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 228                                                        0, &snapshot_ops )))
 229     {
 230         snapshot_next_thread( snapshot, req );
 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         snapshot_next_module( snapshot, req );
 244         release_object( snapshot );
 245     }
 246 }