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 "winnt.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_read_fd,                   /* get_read_fd */
  51     no_write_fd,                  /* get_write_fd */
  52     no_flush,                     /* flush */
  53     no_get_file_info,             /* get_file_info */
  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_request *req )
  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 (req->reset) snapshot->process_pos = 0;
 108     else if (snapshot->process_pos >= snapshot->process_count)
 109     {
 110         set_error( STATUS_NO_MORE_FILES );
 111         return 0;
 112     }
 113     ptr = &snapshot->processes[snapshot->process_pos++];
 114     req->count    = ptr->count;
 115     req->pid      = get_process_id( ptr->process );
 116     req->threads  = ptr->threads;
 117     req->priority = ptr->priority;
 118     return 1;
 119 }
 120
 121 /* get the next thread in the snapshot */
 122 static int snapshot_next_thread( struct snapshot *snapshot, struct next_thread_request *req )
 123 {
 124     struct thread_snapshot *ptr;
 125
 126     if (!snapshot->thread_count)
 127     {
 128         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 129         return 0;
 130     }
 131     if (req->reset) snapshot->thread_pos = 0;
 132     else if (snapshot->thread_pos >= snapshot->thread_count)
 133     {
 134         set_error( STATUS_NO_MORE_FILES );
 135         return 0;
 136     }
 137     ptr = &snapshot->threads[snapshot->thread_pos++];
 138     req->count     = ptr->count;
 139     req->pid       = get_process_id( ptr->thread->process );
 140     req->tid       = get_thread_id( ptr->thread );
 141     req->base_pri  = ptr->priority;
 142     req->delta_pri = 0;  /* FIXME */
 143     return 1;
 144 }
 145
 146 /* get the next module in the snapshot */
 147 static int snapshot_next_module( struct snapshot *snapshot, struct next_module_request *req )
 148 {
 149     struct module_snapshot *ptr;
 150
 151     if (!snapshot->module_count)
 152     {
 153         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 154         return 0;
 155     }
 156     if (req->reset) snapshot->module_pos = 0;
 157     else if (snapshot->module_pos >= snapshot->module_count)
 158     {
 159         set_error( STATUS_NO_MORE_FILES );
 160         return 0;
 161     }
 162     ptr = &snapshot->modules[snapshot->module_pos++];
 163     req->pid  = get_process_id( snapshot->process );
 164     req->base = ptr->base;
 165     return 1;
 166 }
 167
 168 static void snapshot_dump( struct object *obj, int verbose )
 169 {
 170     struct snapshot *snapshot = (struct snapshot *)obj;
 171     assert( obj->ops == &snapshot_ops );
 172     fprintf( stderr, "Snapshot: %d procs %d threads %d modules\n",
 173              snapshot->process_count, snapshot->thread_count, snapshot->module_count );
 174 }
 175
 176 static void snapshot_destroy( struct object *obj )
 177 {
 178     int i;
 179     struct snapshot *snapshot = (struct snapshot *)obj;
 180     assert( obj->ops == &snapshot_ops );
 181     if (snapshot->process_count)
 182     {
 183         for (i = 0; i < snapshot->process_count; i++)
 184             release_object( snapshot->processes[i].process );
 185         free( snapshot->processes );
 186     }
 187     if (snapshot->thread_count)
 188     {
 189         for (i = 0; i < snapshot->thread_count; i++)
 190             release_object( snapshot->threads[i].thread );
 191         free( snapshot->threads );
 192     }
 193     if (snapshot->module_count) free( snapshot->modules );
 194     if (snapshot->process) release_object( snapshot->process );
 195 }
 196
 197 /* create a snapshot */
 198 DECL_HANDLER(create_snapshot)
 199 {
 200     struct snapshot *snapshot;
 201
 202     req->handle = -1;
 203     if ((snapshot = create_snapshot( req->pid, req->flags )))
 204     {
 205         req->handle = alloc_handle( current->process, snapshot, 0, req->inherit );
 206         release_object( snapshot );
 207     }
 208 }
 209
 210 /* get the next process from a snapshot */
 211 DECL_HANDLER(next_process)
 212 {
 213     struct snapshot *snapshot;
 214
 215     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 216                                                        0, &snapshot_ops )))
 217     {
 218         snapshot_next_process( snapshot, req );
 219         release_object( snapshot );
 220     }
 221 }
 222
 223 /* get the next thread from a snapshot */
 224 DECL_HANDLER(next_thread)
 225 {
 226     struct snapshot *snapshot;
 227
 228     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 229                                                        0, &snapshot_ops )))
 230     {
 231         snapshot_next_thread( snapshot, req );
 232         release_object( snapshot );
 233     }
 234 }
 235
 236 /* get the next module from a snapshot */
 237 DECL_HANDLER(next_module)
 238 {
 239     struct snapshot *snapshot;
 240
 241     if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
 242                                                        0, &snapshot_ops )))
 243     {
 244         snapshot_next_module( snapshot, req );
 245         release_object( snapshot );
 246     }
 247 }