Initial import
[samba] / source / registry / reg_perfcount.c
diff --git a/source/registry/reg_perfcount.c b/source/registry/reg_perfcount.c
new file mode 100644 (file)
index 0000000..a31154f
--- /dev/null
@@ -0,0 +1,1357 @@
+/* 
+ *  Unix SMB/CIFS implementation.
+ *  Virtual Windows Registry Layer
+ *
+ *  Copyright (C) Marcin Krzysztof Porwit    2005,
+ *  Copyright (C) Gerald (Jerry) Carter      2005.
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *  
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_RPC_SRV
+
+#define PERFCOUNT_MAX_LEN 256
+
+#define PERFCOUNTDIR   "perfmon"
+#define NAMES_DB       "names.tdb"
+#define DATA_DB                "data.tdb"
+
+/*********************************************************************
+*********************************************************************/
+
+static char* counters_directory( const char *dbname )
+{
+       static pstring fname;
+       fstring path;
+       
+       if ( !dbname )
+               return NULL;
+       
+       fstr_sprintf( path, "%s/%s", PERFCOUNTDIR, dbname );
+       
+       pstrcpy( fname, lock_path( path ) );
+       
+       return fname;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+void perfcount_init_keys( void )
+{
+       char *p = lock_path(PERFCOUNTDIR);
+
+       /* no registry keys; just create the perfmon directory */
+       
+       if ( !directory_exist( p, NULL ) )
+               mkdir( p, 0755 );
+       
+       return;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+uint32 reg_perfcount_get_base_index(void)
+{
+       const char *fname = counters_directory( NAMES_DB );
+       TDB_CONTEXT *names;
+       TDB_DATA kbuf, dbuf;
+       char key[] = "1";
+       uint32 retval = 0;
+       char buf[PERFCOUNT_MAX_LEN];
+
+       names = tdb_open_log(fname, 0, TDB_DEFAULT, O_RDONLY, 0444);
+
+       if ( !names ) {
+               DEBUG(1, ("reg_perfcount_get_base_index: unable to open [%s].\n", fname));
+               return 0;
+       }    
+       /* needs to read the value of key "1" from the counter_names.tdb file, as that is
+          where the total number of counters is stored. We're assuming no holes in the
+          enumeration.
+          The format for the counter_names.tdb file is:
+          key        value
+          1          num_counters
+          2          perf_counter1
+          3          perf_counter1_help
+          4          perf_counter2
+          5          perf_counter2_help
+          even_num   perf_counter<even_num>
+          even_num+1 perf_counter<even_num>_help
+          and so on.
+          So last_counter becomes num_counters*2, and last_help will be last_counter+1 */
+       kbuf.dptr = key;
+       kbuf.dsize = strlen(key);
+       dbuf = tdb_fetch(names, kbuf);
+       if(dbuf.dptr == NULL)
+       {
+               DEBUG(1, ("reg_perfcount_get_base_index: failed to find key \'1\' in [%s].\n", fname));
+               tdb_close(names);
+               return 0;
+       }
+       else
+       {
+               tdb_close(names);
+               memset(buf, 0, PERFCOUNT_MAX_LEN);
+               memcpy(buf, dbuf.dptr, dbuf.dsize);
+               retval = (uint32)atoi(buf);
+               SAFE_FREE(dbuf.dptr);
+               return retval;
+       }
+       return 0;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+uint32 reg_perfcount_get_last_counter(uint32 base_index)
+{
+       uint32 retval;
+
+       if(base_index == 0)
+               retval = 0;
+       else
+               retval = base_index * 2;
+
+       return retval;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+uint32 reg_perfcount_get_last_help(uint32 last_counter)
+{
+       uint32 retval;
+
+       if(last_counter == 0)
+               retval = 0;
+       else
+               retval = last_counter + 1;
+
+       return retval;
+}
+
+
+/*********************************************************************
+*********************************************************************/
+
+static uint32 _reg_perfcount_multi_sz_from_tdb(TDB_CONTEXT *tdb, 
+                                              int keyval,
+                                              char **retbuf,
+                                              uint32 buffer_size)
+{
+       TDB_DATA kbuf, dbuf;
+       char temp[256];
+       char *buf1 = *retbuf, *buf2 = NULL;
+       uint32 working_size = 0;
+       UNISTR2 name_index, name;
+
+       memset(temp, 0, sizeof(temp));
+       snprintf(temp, sizeof(temp), "%d", keyval);
+       kbuf.dptr = temp;
+       kbuf.dsize = strlen(temp);
+       dbuf = tdb_fetch(tdb, kbuf);
+       if(dbuf.dptr == NULL)
+       {
+               /* If a key isn't there, just bypass it -- this really shouldn't 
+                  happen unless someone's mucking around with the tdb */
+               DEBUG(3, ("_reg_perfcount_multi_sz_from_tdb: failed to find key [%s] in [%s].\n",
+                         temp, tdb->name));
+               return buffer_size;
+       }
+       /* First encode the name_index */
+       working_size = (kbuf.dsize + 1)*sizeof(uint16);
+       buf2 = SMB_REALLOC(buf1, buffer_size + working_size);
+       if(!buf2)
+       {
+               SAFE_FREE(buf1);
+               buffer_size = 0;
+               return buffer_size;
+       }
+       buf1 = buf2;
+       init_unistr2(&name_index, kbuf.dptr, UNI_STR_TERMINATE);
+       memcpy(buf1+buffer_size, (char *)name_index.buffer, working_size);
+       buffer_size += working_size;
+       /* Now encode the actual name */
+       working_size = (dbuf.dsize + 1)*sizeof(uint16);
+       buf2 = SMB_REALLOC(buf1, buffer_size + working_size);
+       if(!buf2)
+       {
+               SAFE_FREE(buf1);
+               buffer_size = 0;
+               return buffer_size;
+       }
+       buf1 = buf2;
+       memset(temp, 0, sizeof(temp));
+       memcpy(temp, dbuf.dptr, dbuf.dsize);
+       SAFE_FREE(dbuf.dptr);
+       init_unistr2(&name, temp, UNI_STR_TERMINATE);
+       memcpy(buf1+buffer_size, (char *)name.buffer, working_size);
+       buffer_size += working_size;
+
+       *retbuf = buf1;
+
+       return buffer_size;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+uint32 reg_perfcount_get_counter_help(uint32 base_index, char **retbuf)
+{
+       char *buf1 = NULL, *buf2 = NULL;
+       uint32 buffer_size = 0;
+       TDB_CONTEXT *names;
+       const char *fname = counters_directory( NAMES_DB );
+       int i;
+
+       if(base_index == 0)
+               return 0;
+
+       names = tdb_open_log(fname, 0, TDB_DEFAULT, O_RDONLY, 0444);
+
+       if(names == NULL)
+       {
+               DEBUG(1, ("reg_perfcount_get_counter_help: unable to open [%s].\n", fname));
+               return 0;
+       }    
+
+       for(i = 1; i <= base_index; i++)
+       {
+               buffer_size = _reg_perfcount_multi_sz_from_tdb(names, (i*2)+1, retbuf, buffer_size);
+       }
+       tdb_close(names);
+
+       /* Now terminate the MULTI_SZ with a double unicode NULL */
+       buf1 = *retbuf;
+       buf2 = SMB_REALLOC(buf1, buffer_size + 2);
+       if(!buf2)
+       {
+               SAFE_FREE(buf1);
+               buffer_size = 0;
+       }
+       else
+       {
+               buf1 = buf2;
+               buf1[buffer_size++] = '\0';
+               buf1[buffer_size++] = '\0';
+       }
+
+       *retbuf = buf1;
+
+       return buffer_size;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+uint32 reg_perfcount_get_counter_names(uint32 base_index, char **retbuf)
+{
+       char *buf1 = NULL, *buf2 = NULL;
+       uint32 buffer_size = 0;
+       TDB_CONTEXT *names;
+       const char *fname = counters_directory( NAMES_DB );
+       int i;
+
+       if(base_index == 0)
+               return 0;
+
+       names = tdb_open_log(fname, 0, TDB_DEFAULT, O_RDONLY, 0444);
+
+       if(names == NULL)
+       {
+               DEBUG(1, ("reg_perfcount_get_counter_names: unable to open [%s].\n", fname));
+               return 0;
+       }    
+
+       buffer_size = _reg_perfcount_multi_sz_from_tdb(names, 1, retbuf, buffer_size);
+
+       for(i = 1; i <= base_index; i++)
+       {
+               buffer_size = _reg_perfcount_multi_sz_from_tdb(names, i*2, retbuf, buffer_size);
+       }
+       tdb_close(names);
+
+       /* Now terminate the MULTI_SZ with a double unicode NULL */
+       buf1 = *retbuf;
+       buf2 = SMB_REALLOC(buf1, buffer_size + 2);
+       if(!buf2)
+       {
+               SAFE_FREE(buf1);
+               buffer_size = 0;
+       }
+       else
+       {
+               buf1 = buf2;
+               buf1[buffer_size++] = '\0';
+               buf1[buffer_size++] = '\0';
+       }
+
+       *retbuf=buf1;
+
+       return buffer_size;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static void _reg_perfcount_make_key(TDB_DATA *key,
+                                   char *buf,
+                                   int buflen,
+                                   int key_part1,
+                                   const char *key_part2)
+{
+       memset(buf, 0, buflen);
+       if(key_part2 != NULL)
+               snprintf(buf, buflen,"%d%s", key_part1, key_part2);
+       else 
+               snprintf(buf, buflen, "%d", key_part1);
+
+       key->dptr = buf;
+       key->dsize = strlen(buf);
+
+       return;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_isparent(TDB_DATA data)
+{
+       if(data.dsize > 0)
+       {
+               if(data.dptr[0] == 'p')
+                       return True;
+               else
+                       return False;
+       }
+       return False;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_ischild(TDB_DATA data)
+{
+       if(data.dsize > 0)
+       {
+               if(data.dptr[0] == 'c')
+                       return True;
+               else
+                       return False;
+       }
+       return False;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static uint32 _reg_perfcount_get_numinst(int objInd, TDB_CONTEXT *names)
+{
+       TDB_DATA key, data;
+       char buf[PERFCOUNT_MAX_LEN];
+
+       _reg_perfcount_make_key(&key, buf, PERFCOUNT_MAX_LEN, objInd, "inst");
+       data = tdb_fetch(names, key);
+
+       if(data.dptr == NULL)
+               return (uint32)PERF_NO_INSTANCES;
+    
+       memset(buf, 0, PERFCOUNT_MAX_LEN);
+       memcpy(buf, data.dptr, data.dsize);
+       return (uint32)atoi(buf);
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_add_object(PERF_DATA_BLOCK *block,
+                                     prs_struct *ps,
+                                     int num,
+                                     TDB_DATA data,
+                                     TDB_CONTEXT *names)
+{
+       int i;
+       BOOL success = False;
+       PERF_OBJECT_TYPE *obj;
+
+       block->objects = (PERF_OBJECT_TYPE *)TALLOC_REALLOC_ARRAY(ps->mem_ctx,
+                                                                 block->objects,
+                                                                 PERF_OBJECT_TYPE,
+                                                                 block->NumObjectTypes+1);
+       if(block->objects == NULL)
+               return False;
+       obj = &(block->objects[block->NumObjectTypes]);
+       memset((void *)&(block->objects[block->NumObjectTypes]), 0, sizeof(PERF_OBJECT_TYPE));
+       block->objects[block->NumObjectTypes].ObjectNameTitleIndex = num;
+       block->objects[block->NumObjectTypes].ObjectNameTitlePointer = 0;
+       block->objects[block->NumObjectTypes].ObjectHelpTitleIndex = num+1;
+       block->objects[block->NumObjectTypes].ObjectHelpTitlePointer = 0;
+       block->objects[block->NumObjectTypes].NumCounters = 0;
+       block->objects[block->NumObjectTypes].DefaultCounter = 0;
+       block->objects[block->NumObjectTypes].NumInstances = _reg_perfcount_get_numinst(num, names);
+       block->objects[block->NumObjectTypes].counters = NULL;
+       block->objects[block->NumObjectTypes].instances = NULL;
+       block->objects[block->NumObjectTypes].counter_data.ByteLength = sizeof(uint32);
+       block->objects[block->NumObjectTypes].counter_data.data = NULL;
+       block->objects[block->NumObjectTypes].DetailLevel = PERF_DETAIL_NOVICE;
+       block->NumObjectTypes+=1;
+
+       for(i = 0; i < (int)obj->NumInstances; i++)
+       {
+               success = _reg_perfcount_add_instance(obj, ps, i, names);
+       }
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+BOOL _reg_perfcount_get_counter_data(TDB_DATA key, TDB_DATA *data)
+{
+       TDB_CONTEXT *counters;
+       const char *fname = counters_directory( DATA_DB );
+    
+       counters = tdb_open_log(fname, 0, TDB_DEFAULT, O_RDONLY, 0444);
+
+       if(counters == NULL)
+       {
+               DEBUG(1, ("reg_perfcount_get_counter_data: unable to open [%s].\n", fname));
+               return False;
+       }    
+
+       *data = tdb_fetch(counters, key);
+    
+       tdb_close(counters);
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static uint32 _reg_perfcount_get_size_field(uint32 CounterType)
+{
+       uint32 retval;
+
+       retval = CounterType;
+
+       /* First mask out reserved lower 8 bits */
+       retval = retval & 0xFFFFFF00;
+       retval = retval << 22;
+       retval = retval >> 22;
+
+       return retval;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static uint32 _reg_perfcount_compute_scale(SMB_BIG_INT data)
+{
+       int scale = 0;
+       if(data == 0)
+               return scale;
+       while(data > 100)
+       {
+               data /= 10;
+               scale--;
+       }
+       while(data < 10)
+       {
+               data *= 10;
+               scale++;
+       }
+
+       return (uint32)scale;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_get_counter_info(PERF_DATA_BLOCK *block,
+                                           prs_struct *ps,
+                                           int CounterIndex,
+                                           PERF_OBJECT_TYPE *obj,
+                                           TDB_CONTEXT *names)
+{
+       TDB_DATA key, data;
+       char buf[PERFCOUNT_MAX_LEN];
+       size_t dsize, padding;
+       long int data32, dbuf[2];
+       SMB_BIG_INT data64;
+       uint32 counter_size;
+
+       obj->counters[obj->NumCounters].DefaultScale = 0;
+       dbuf[0] = dbuf[1] = 0;
+       padding = 0;
+
+       _reg_perfcount_make_key(&key, buf, PERFCOUNT_MAX_LEN, CounterIndex, "type");
+       data = tdb_fetch(names, key);
+       if(data.dptr == NULL)
+       {
+               DEBUG(3, ("_reg_perfcount_get_counter_info: No type data for counter [%d].\n", CounterIndex));
+               return False;
+       }
+       memset(buf, 0, PERFCOUNT_MAX_LEN);
+       memcpy(buf, data.dptr, data.dsize);
+       obj->counters[obj->NumCounters].CounterType = atoi(buf);
+       DEBUG(10, ("_reg_perfcount_get_counter_info: Got type [%d] for counter [%d].\n",
+                  obj->counters[obj->NumCounters].CounterType, CounterIndex));
+       free(data.dptr);
+
+       /* Fetch the actual data */
+       _reg_perfcount_make_key(&key, buf, PERFCOUNT_MAX_LEN, CounterIndex, "");
+       _reg_perfcount_get_counter_data(key, &data);
+       if(data.dptr == NULL)
+       {
+               DEBUG(3, ("_reg_perfcount_get_counter_info: No counter data for counter [%d].\n", CounterIndex));
+               return False;
+       }
+    
+       counter_size = _reg_perfcount_get_size_field(obj->counters[obj->NumCounters].CounterType);
+
+       if(counter_size == PERF_SIZE_DWORD)
+       {
+               dsize = sizeof(data32);
+               memset(buf, 0, PERFCOUNT_MAX_LEN);
+               memcpy(buf, data.dptr, data.dsize);
+               data32 = strtol(buf, NULL, 0);
+               if((obj->counters[obj->NumCounters].CounterType & 0x00000F00) == PERF_TYPE_NUMBER)
+                       obj->counters[obj->NumCounters].DefaultScale = _reg_perfcount_compute_scale((SMB_BIG_INT)data32);
+               else
+                       obj->counters[obj->NumCounters].DefaultScale = 0;
+               dbuf[0] = data32;
+               padding = (dsize - (obj->counter_data.ByteLength%dsize)) % dsize;
+       }
+       else if(counter_size == PERF_SIZE_LARGE)
+       {
+               dsize = sizeof(data64);
+               memset(buf, 0, PERFCOUNT_MAX_LEN);
+               memcpy(buf, data.dptr, data.dsize);
+               data64 = atof(buf);
+               if((obj->counters[obj->NumCounters].CounterType & 0x00000F00) == PERF_TYPE_NUMBER)
+                       obj->counters[obj->NumCounters].DefaultScale = _reg_perfcount_compute_scale(data64);
+               else
+                       obj->counters[obj->NumCounters].DefaultScale = 0;
+               memcpy((void *)dbuf, (const void *)&data64, dsize);
+               padding = (dsize - (obj->counter_data.ByteLength%dsize)) % dsize;
+       }
+       else /* PERF_SIZE_VARIABLE_LEN */
+       {
+               dsize = data.dsize;
+               memset(buf, 0, PERFCOUNT_MAX_LEN);
+               memcpy(buf, data.dptr, data.dsize);
+       }
+       free(data.dptr);
+
+       obj->counter_data.ByteLength += dsize + padding;
+       obj->counter_data.data = TALLOC_REALLOC_ARRAY(ps->mem_ctx,
+                                                     obj->counter_data.data,
+                                                     uint8,
+                                                     obj->counter_data.ByteLength - sizeof(uint32));
+       if(obj->counter_data.data == NULL)
+               return False;
+       if(dbuf[0] != 0 || dbuf[1] != 0)
+       {
+               memcpy((void *)(obj->counter_data.data + 
+                               (obj->counter_data.ByteLength - (sizeof(uint32) + dsize))), 
+                      (const void *)dbuf, dsize);
+       }
+       else
+       {
+               /* Handling PERF_SIZE_VARIABLE_LEN */
+               memcpy((void *)(obj->counter_data.data +
+                               (obj->counter_data.ByteLength - (sizeof(uint32) + dsize))),
+                      (const void *)buf, dsize);
+       }
+       obj->counters[obj->NumCounters].CounterOffset = obj->counter_data.ByteLength - dsize;
+       if(obj->counters[obj->NumCounters].CounterOffset % dsize != 0)
+       {
+               DEBUG(3,("Improperly aligned counter [%d]\n", obj->NumCounters));
+       }
+       obj->counters[obj->NumCounters].CounterSize = dsize;
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+PERF_OBJECT_TYPE *_reg_perfcount_find_obj(PERF_DATA_BLOCK *block, int objind)
+{
+       int i;
+
+       PERF_OBJECT_TYPE *obj = NULL;
+
+       for(i = 0; i < block->NumObjectTypes; i++)
+       {
+               if(block->objects[i].ObjectNameTitleIndex == objind)
+               {
+                       obj = &(block->objects[i]);
+               }
+       }
+
+       return obj;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_add_counter(PERF_DATA_BLOCK *block,
+                                      prs_struct *ps,
+                                      int num,
+                                      TDB_DATA data,
+                                      TDB_CONTEXT *names)
+{
+       char *begin, *end, *start, *stop;
+       int parent;
+       PERF_OBJECT_TYPE *obj;
+       BOOL success = False;
+       char buf[PERFCOUNT_MAX_LEN];
+    
+       obj = NULL;
+       memset(buf, 0, PERFCOUNT_MAX_LEN);
+       memcpy(buf, data.dptr, data.dsize);
+       begin = index(buf, '[');
+       end = index(buf, ']');
+       if(begin == NULL || end == NULL)
+               return False;
+       start = begin+1;
+
+       while(start < end)
+       {
+               stop = index(start, ',');
+               if(stop == NULL)
+                       stop = end;
+               *stop = '\0';
+               parent = atoi(start);
+
+               obj = _reg_perfcount_find_obj(block, parent);
+               if(obj == NULL)
+               {
+                       /* At this point we require that the parent object exist.
+                          This can probably be handled better at some later time */
+                       DEBUG(3, ("_reg_perfcount_add_counter: Could not find parent object [%d] for counter [%d].\n",
+                                 parent, num));
+                       return False;
+               }
+               obj->counters = (PERF_COUNTER_DEFINITION *)TALLOC_REALLOC_ARRAY(ps->mem_ctx,
+                                                                               obj->counters,
+                                                                               PERF_COUNTER_DEFINITION,
+                                                                               obj->NumCounters+1);
+               if(obj->counters == NULL)
+                       return False;
+               memset((void *)&(obj->counters[obj->NumCounters]), 0, sizeof(PERF_COUNTER_DEFINITION));
+               obj->counters[obj->NumCounters].CounterNameTitleIndex=num;
+               obj->counters[obj->NumCounters].CounterHelpTitleIndex=num+1;
+               obj->counters[obj->NumCounters].DetailLevel = PERF_DETAIL_NOVICE;
+               obj->counters[obj->NumCounters].ByteLength = sizeof(PERF_COUNTER_DEFINITION);
+               success = _reg_perfcount_get_counter_info(block, ps, num, obj, names);
+               obj->NumCounters += 1;
+               start = stop + 1;
+       }
+       
+       /* Handle case of Objects/Counters without any counter data, which would suggest
+          that the required instances are not there yet, so change NumInstances from
+          PERF_NO_INSTANCES to 0 */
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+BOOL _reg_perfcount_get_instance_info(PERF_INSTANCE_DEFINITION *inst,
+                                     prs_struct *ps,
+                                     int instId,
+                                     PERF_OBJECT_TYPE *obj,
+                                     TDB_CONTEXT *names)
+{
+       TDB_DATA key, data;
+       char buf[PERFCOUNT_MAX_LEN], temp[PERFCOUNT_MAX_LEN];
+       wpstring name;
+       int pad;
+
+       /* First grab the instance data from the data file */
+       memset(temp, 0, PERFCOUNT_MAX_LEN);
+       snprintf(temp, PERFCOUNT_MAX_LEN, "i%d", instId);
+       _reg_perfcount_make_key(&key, buf, PERFCOUNT_MAX_LEN, obj->ObjectNameTitleIndex, temp);
+       _reg_perfcount_get_counter_data(key, &data);
+       if(data.dptr == NULL)
+       {
+               DEBUG(3, ("_reg_perfcount_get_instance_info: No instance data for instance [%s].\n",
+                         buf));
+               return False;
+       }
+       inst->counter_data.ByteLength = data.dsize + sizeof(inst->counter_data.ByteLength);
+       inst->counter_data.data = TALLOC_REALLOC_ARRAY(ps->mem_ctx,
+                                                      inst->counter_data.data,
+                                                      uint8,
+                                                      data.dsize);
+       if(inst->counter_data.data == NULL)
+               return False;
+       memset(inst->counter_data.data, 0, data.dsize);
+       memcpy(inst->counter_data.data, data.dptr, data.dsize);
+       free(data.dptr);
+
+       /* Fetch instance name */
+       memset(temp, 0, PERFCOUNT_MAX_LEN);
+       snprintf(temp, PERFCOUNT_MAX_LEN, "i%dname", instId);
+       _reg_perfcount_make_key(&key, buf, PERFCOUNT_MAX_LEN, obj->ObjectNameTitleIndex, temp);
+       data = tdb_fetch(names, key);
+       if(data.dptr == NULL)
+       {
+               /* Not actually an error, but possibly unintended? -- just logging FYI */
+               DEBUG(3, ("_reg_perfcount_get_instance_info: No instance name for instance [%s].\n",
+                         buf));
+               inst->NameLength = 0;
+       }
+       else
+       {
+               memset(buf, 0, PERFCOUNT_MAX_LEN);
+               memcpy(buf, data.dptr, data.dsize);
+               rpcstr_push((void *)name, buf, sizeof(name), STR_TERMINATE);
+               inst->NameLength = (strlen_w(name) * 2) + 2;
+               inst->data = TALLOC_REALLOC_ARRAY(ps->mem_ctx,
+                                                 inst->data,
+                                                 uint8,
+                                                 inst->NameLength);
+               memcpy(inst->data, name, inst->NameLength);
+               free(data.dptr);
+       }
+
+       inst->ParentObjectTitleIndex = 0;
+       inst->ParentObjectTitlePointer = 0;
+       inst->UniqueID = PERF_NO_UNIQUE_ID;
+       inst->NameOffset = 6 * sizeof(uint32);
+    
+       inst->ByteLength = inst->NameOffset + inst->NameLength;
+       /* Need to be aligned on a 64-bit boundary here for counter_data */
+       if((pad = (inst->ByteLength % 8)))
+       {
+               pad = 8 - pad;
+               inst->data = TALLOC_REALLOC_ARRAY(ps->mem_ctx,
+                                                 inst->data,
+                                                 uint8,
+                                                 inst->NameLength + pad);
+               memset(inst->data + inst->NameLength, 0, pad);
+               inst->ByteLength += pad;
+       }
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+BOOL _reg_perfcount_add_instance(PERF_OBJECT_TYPE *obj,
+                                prs_struct *ps,
+                                int instInd,
+                                TDB_CONTEXT *names)
+{
+       BOOL success;
+       PERF_INSTANCE_DEFINITION *inst;
+
+       success = False;
+
+       if(obj->instances == NULL)
+       {
+               obj->instances = TALLOC_REALLOC_ARRAY(ps->mem_ctx, 
+                                                     obj->instances,
+                                                     PERF_INSTANCE_DEFINITION,
+                                                     obj->NumInstances);
+       }
+       if(obj->instances == NULL)
+               return False;
+    
+       memset(&(obj->instances[instInd]), 0, sizeof(PERF_INSTANCE_DEFINITION));
+       inst = &(obj->instances[instInd]);
+       success = _reg_perfcount_get_instance_info(inst, ps, instInd, obj, names);
+    
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static int _reg_perfcount_assemble_global(PERF_DATA_BLOCK *block,
+                                         prs_struct *ps,
+                                         int base_index,
+                                         TDB_CONTEXT *names)
+{
+       BOOL success;
+       int i, j, retval = 0;
+       char keybuf[PERFCOUNT_MAX_LEN];
+       TDB_DATA key, data;
+
+       for(i = 1; i <= base_index; i++)
+       {
+               j = i*2;
+               _reg_perfcount_make_key(&key, keybuf, PERFCOUNT_MAX_LEN, j, "rel");
+               data = tdb_fetch(names, key);
+               if(data.dptr != NULL)
+               {
+                       if(_reg_perfcount_isparent(data))
+                               success = _reg_perfcount_add_object(block, ps, j, data, names);
+                       else if(_reg_perfcount_ischild(data))
+                               success = _reg_perfcount_add_counter(block, ps, j, data, names);
+                       else
+                       {
+                               DEBUG(3, ("Bogus relationship [%s] for counter [%d].\n", data.dptr, j));
+                               success = False;
+                       }
+                       if(success == False)
+                       {
+                               DEBUG(3, ("_reg_perfcount_assemble_global: Failed to add new relationship for counter [%d].\n", j));
+                               retval = -1;
+                       }
+                       free(data.dptr);
+               }
+               else
+                       DEBUG(3, ("NULL relationship for counter [%d] using key [%s].\n", j, keybuf));
+       }       
+       return retval;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_get_64(SMB_BIG_UINT *retval,
+                                 TDB_CONTEXT *tdb,
+                                 int key_part1,
+                                 const char *key_part2)
+{
+       TDB_DATA key, data;
+       char buf[PERFCOUNT_MAX_LEN];
+
+       _reg_perfcount_make_key(&key, buf, PERFCOUNT_MAX_LEN, key_part1, key_part2);
+
+       data = tdb_fetch(tdb, key);
+       if(data.dptr == NULL)
+       {
+               DEBUG(3,("_reg_perfcount_get_64: No data found for key [%s].\n", key.dptr));
+               return False;
+       }
+
+       memset(buf, 0, PERFCOUNT_MAX_LEN);
+       memcpy(buf, data.dptr, data.dsize);
+       free(data.dptr);
+
+       *retval = atof(buf);
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_init_data_block_perf(PERF_DATA_BLOCK *block,
+                                               TDB_CONTEXT *names)
+{
+       SMB_BIG_UINT PerfFreq, PerfTime, PerfTime100nSec;
+       TDB_CONTEXT *counters;
+       BOOL status = False;
+       const char *fname = counters_directory( DATA_DB );
+    
+       counters = tdb_open_log(fname, 0, TDB_DEFAULT, O_RDONLY, 0444);
+    
+       if(counters == NULL)
+       {
+               DEBUG(1, ("reg_perfcount_init_data_block_perf: unable to open [%s].\n", fname));
+               return False;
+       }    
+    
+       status = _reg_perfcount_get_64(&PerfFreq, names, 0, "PerfFreq");
+       if(status == False)
+       {
+               tdb_close(counters);
+               return status;
+       }
+       memcpy((void *)&(block->PerfFreq), (const void *)&PerfFreq, sizeof(PerfFreq));
+
+       status = _reg_perfcount_get_64(&PerfTime, counters, 0, "PerfTime");
+       if(status == False)
+       {
+               tdb_close(counters);
+               return status;
+       }
+       memcpy((void *)&(block->PerfTime), (const void *)&PerfTime, sizeof(PerfTime));
+
+       status = _reg_perfcount_get_64(&PerfTime100nSec, counters, 0, "PerfTime100nSec");
+       if(status == False)
+       {
+               tdb_close(counters);
+               return status;
+       }
+       memcpy((void *)&(block->PerfTime100nSec), (const void *)&PerfTime100nSec, sizeof(PerfTime100nSec));
+
+       tdb_close(counters);
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static void _reg_perfcount_init_data_block(PERF_DATA_BLOCK *block, prs_struct *ps, TDB_CONTEXT *names)
+{
+       wpstring temp;
+       time_t tm;
+       memset(temp, 0, sizeof(temp));
+       rpcstr_push((void *)temp, "PERF", sizeof(temp), STR_TERMINATE);
+       memcpy(block->Signature, temp, strlen_w(temp) *2);
+
+       if(ps->bigendian_data == RPC_BIG_ENDIAN)
+               block->LittleEndian = 0;
+       else
+               block->LittleEndian = 1;
+       block->Version = 1;
+       block->Revision = 1;
+       block->TotalByteLength = 0;
+       block->NumObjectTypes = 0;
+       block->DefaultObject = -1;
+       block->objects = NULL;
+       tm = time(NULL);
+       make_systemtime(&(block->SystemTime), gmtime(&tm));
+       _reg_perfcount_init_data_block_perf(block, names);
+       memset(temp, 0, sizeof(temp));
+       rpcstr_push((void *)temp, global_myname(), sizeof(temp), STR_TERMINATE);
+       block->SystemNameLength = (strlen_w(temp) * 2) + 2;
+       block->data = TALLOC_ZERO_ARRAY(ps->mem_ctx, uint8, block->SystemNameLength + (8 - (block->SystemNameLength % 8)));
+       memcpy(block->data, temp, block->SystemNameLength);
+       block->SystemNameOffset = sizeof(PERF_DATA_BLOCK) - sizeof(block->objects) - sizeof(block->data); 
+       block->HeaderLength = block->SystemNameOffset + block->SystemNameLength;
+       /* Make sure to adjust for 64-bit alignment for when we finish writing the system name,
+          so that the PERF_OBJECT_TYPE struct comes out 64-bit aligned */
+       block->HeaderLength += 8 - (block->HeaderLength % 8);
+
+       return;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static uint32 _reg_perfcount_perf_data_block_fixup(PERF_DATA_BLOCK *block, prs_struct *ps)
+{
+       int obj, cnt, inst, pad, i;
+       PERF_OBJECT_TYPE *object;
+       PERF_INSTANCE_DEFINITION *instance;
+       PERF_COUNTER_DEFINITION *counter;
+       PERF_COUNTER_BLOCK *counter_data;
+       char *temp = NULL, *src_addr, *dst_addr;
+
+       block->TotalByteLength = 0;
+       object = block->objects;
+       for(obj = 0; obj < block->NumObjectTypes; obj++)
+       {
+               object[obj].TotalByteLength = 0;
+               object[obj].DefinitionLength = 0;
+               instance = object[obj].instances;
+               counter = object[obj].counters;
+               for(cnt = 0; cnt < object[obj].NumCounters; cnt++)
+               {
+                       object[obj].TotalByteLength += counter[cnt].ByteLength;
+                       object[obj].DefinitionLength += counter[cnt].ByteLength;
+               }
+               if(object[obj].NumInstances != PERF_NO_INSTANCES)
+               {
+                       for(inst = 0; inst < object[obj].NumInstances; inst++)
+                       {
+                               instance = &(object[obj].instances[inst]);
+                               object[obj].TotalByteLength += instance->ByteLength;
+                               counter_data = &(instance->counter_data);
+                               counter = &(object[obj].counters[object[obj].NumCounters - 1]);
+                               counter_data->ByteLength = counter->CounterOffset + counter->CounterSize + sizeof(counter_data->ByteLength);
+                               temp = TALLOC_REALLOC_ARRAY(ps->mem_ctx, 
+                                                           temp, 
+                                                           char, 
+                                                           counter_data->ByteLength- sizeof(counter_data->ByteLength));
+                               memset(temp, 0, counter_data->ByteLength - sizeof(counter_data->ByteLength));
+                               src_addr = (char *)counter_data->data;
+                               for(i = 0; i < object[obj].NumCounters; i++)
+                               {
+                                       counter = &(object[obj].counters[i]);
+                                       dst_addr = temp + counter->CounterOffset - sizeof(counter_data->ByteLength);
+                                       memcpy(dst_addr, src_addr, counter->CounterSize);
+                                       src_addr += counter->CounterSize;
+                               }
+                               /* Make sure to be 64-bit aligned */
+                               if((pad = (counter_data->ByteLength % 8)))
+                               {
+                                       pad = 8 - pad;
+                               }
+                               counter_data->data = TALLOC_REALLOC_ARRAY(ps->mem_ctx,
+                                                                        counter_data->data,
+                                                                        uint8,
+                                                                        counter_data->ByteLength - sizeof(counter_data->ByteLength) + pad);
+                               memset(counter_data->data, 0, counter_data->ByteLength - sizeof(counter_data->ByteLength) + pad);
+                               memcpy(counter_data->data, temp, counter_data->ByteLength - sizeof(counter_data->ByteLength));
+                               counter_data->ByteLength += pad;
+                               object[obj].TotalByteLength += counter_data->ByteLength;
+                       }
+               }
+               else
+               {
+                       /* Need to be 64-bit aligned at the end of the counter_data block, so pad counter_data to a 64-bit boundary,
+                          so that the next PERF_OBJECT_TYPE can start on a 64-bit alignment */
+                       if((pad = (object[obj].counter_data.ByteLength % 8)))
+                       {
+                               pad = 8 - pad;
+                               object[obj].counter_data.data = TALLOC_REALLOC_ARRAY(ps->mem_ctx, 
+                                                                                    object[obj].counter_data.data,
+                                                                                    uint8, 
+                                                                                    object[obj].counter_data.ByteLength + pad);
+                               memset((void *)(object[obj].counter_data.data + object[obj].counter_data.ByteLength), 0, pad);
+                               object[obj].counter_data.ByteLength += pad;
+                       }
+                       object[obj].TotalByteLength += object[obj].counter_data.ByteLength;
+               }
+               object[obj].HeaderLength = sizeof(*object) - (sizeof(counter) + sizeof(instance) + sizeof(PERF_COUNTER_BLOCK));
+               object[obj].TotalByteLength += object[obj].HeaderLength;
+               object[obj].DefinitionLength += object[obj].HeaderLength;
+               
+               block->TotalByteLength += object[obj].TotalByteLength;
+       }
+
+       return block->TotalByteLength;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+uint32 reg_perfcount_get_perf_data_block(uint32 base_index, 
+                                        prs_struct *ps, 
+                                        PERF_DATA_BLOCK *block,
+                                        char *object_ids)
+{
+       uint32 buffer_size = 0, last_counter;
+       const char *fname = counters_directory( NAMES_DB );
+       TDB_CONTEXT *names;
+       int retval;
+       
+       names = tdb_open_log(fname, 0, TDB_DEFAULT, O_RDONLY, 0444);
+
+       if(names == NULL)
+       {
+               DEBUG(1, ("reg_perfcount_get_perf_data_block: unable to open [%s].\n", fname));
+               return 0;
+       }
+
+       _reg_perfcount_init_data_block(block, ps, names);
+
+       last_counter = reg_perfcount_get_last_counter(base_index);
+    
+       if(object_ids == NULL)
+       {
+               /* we're getting a request for "Global" here */
+               retval = _reg_perfcount_assemble_global(block, ps, base_index, names);
+       }
+       else
+       {
+               /* we're getting a request for a specific set of PERF_OBJECT_TYPES */
+               retval = _reg_perfcount_assemble_global(block, ps, base_index, names);
+       }
+       buffer_size = _reg_perfcount_perf_data_block_fixup(block, ps);
+
+       tdb_close(names);
+
+       return buffer_size + block->HeaderLength;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_marshall_perf_data_block(prs_struct *ps, PERF_DATA_BLOCK block, int depth)
+{
+       int i;
+       prs_debug(ps, depth, "", "_reg_perfcount_marshall_perf_data_block");
+       depth++;
+
+       if(!prs_align(ps))
+               return False;
+       for(i = 0; i < 4; i++)
+       {
+               if(!prs_uint16("Signature", ps, depth, &block.Signature[i]))
+                       return False;
+       }
+       if(!prs_uint32("Little Endian", ps, depth, &block.LittleEndian))
+               return False;
+       if(!prs_uint32("Version", ps, depth, &block.Version))
+               return False;
+       if(!prs_uint32("Revision", ps, depth, &block.Revision))
+               return False;
+       if(!prs_uint32("TotalByteLength", ps, depth, &block.TotalByteLength))
+               return False;
+       if(!prs_uint32("HeaderLength", ps, depth, &block.HeaderLength))
+               return False;
+       if(!prs_uint32("NumObjectTypes", ps, depth, &block.NumObjectTypes))
+               return False;
+       if(!prs_uint32("DefaultObject", ps, depth, &block.DefaultObject))
+               return False;
+       if(!spoolss_io_system_time("SystemTime", ps, depth, &block.SystemTime))
+               return False;
+       if(!prs_uint32("Padding", ps, depth, &block.Padding))
+               return False;
+       if(!prs_align_uint64(ps))
+               return False;
+       if(!prs_uint64("PerfTime", ps, depth, &block.PerfTime))
+               return False;
+       if(!prs_uint64("PerfFreq", ps, depth, &block.PerfFreq))
+               return False;
+       if(!prs_uint64("PerfTime100nSec", ps, depth, &block.PerfTime100nSec))
+               return False;
+       if(!prs_uint32("SystemNameLength", ps, depth, &block.SystemNameLength))
+               return False;
+       if(!prs_uint32("SystemNameOffset", ps, depth, &block.SystemNameOffset))
+               return False;
+       /* hack to make sure we're 64-bit aligned at the end of this whole mess */
+       if(!prs_uint8s(False, "SystemName", ps, depth, block.data, 
+                      block.HeaderLength - block.SystemNameOffset)) 
+               return False;
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_marshall_perf_counters(prs_struct *ps,
+                                                 PERF_OBJECT_TYPE object,
+                                                 int depth)
+{
+       int cnt;
+       PERF_COUNTER_DEFINITION counter;
+
+       prs_debug(ps, depth, "", "_reg_perfcount_marshall_perf_counters");
+       depth++;
+    
+       for(cnt = 0; cnt < object.NumCounters; cnt++)
+       {
+               counter = object.counters[cnt];
+
+               if(!prs_align(ps))
+                       return False;
+               if(!prs_uint32("ByteLength", ps, depth, &counter.ByteLength))
+                       return False;
+               if(!prs_uint32("CounterNameTitleIndex", ps, depth, &counter.CounterNameTitleIndex))
+                       return False;
+               if(!prs_uint32("CounterNameTitlePointer", ps, depth, &counter.CounterNameTitlePointer))
+                       return False;
+               if(!prs_uint32("CounterHelpTitleIndex", ps, depth, &counter.CounterHelpTitleIndex))
+                       return False;
+               if(!prs_uint32("CounterHelpTitlePointer", ps, depth, &counter.CounterHelpTitlePointer))
+                       return False;
+               if(!prs_uint32("DefaultScale", ps, depth, &counter.DefaultScale))
+                       return False;
+               if(!prs_uint32("DetailLevel", ps, depth, &counter.DetailLevel))
+                       return False;
+               if(!prs_uint32("CounterType", ps, depth, &counter.CounterType))
+                       return False;
+               if(!prs_uint32("CounterSize", ps, depth, &counter.CounterSize))
+                       return False;
+               if(!prs_uint32("CounterOffset", ps, depth, &counter.CounterOffset))
+                       return False;
+       }
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_marshall_perf_counter_data(prs_struct *ps, 
+                                                     PERF_COUNTER_BLOCK counter_data, 
+                                                     int depth)
+{
+       prs_debug(ps, depth, "", "_reg_perfcount_marshall_perf_counter_data");
+       depth++;
+    
+       if(!prs_align_uint64(ps))
+               return False;
+    
+       if(!prs_uint32("ByteLength", ps, depth, &counter_data.ByteLength))
+               return False;
+       if(!prs_uint8s(False, "CounterData", ps, depth, counter_data.data, counter_data.ByteLength - sizeof(uint32)))
+               return False;
+       if(!prs_align_uint64(ps))
+               return False;
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_marshall_perf_instances(prs_struct *ps,
+                                                  PERF_OBJECT_TYPE object, 
+                                                  int depth)
+{
+       PERF_INSTANCE_DEFINITION instance;
+       int inst;
+
+       prs_debug(ps, depth, "", "_reg_perfcount_marshall_perf_instances");
+       depth++;
+
+       for(inst = 0; inst < object.NumInstances; inst++)
+       {
+               instance = object.instances[inst];
+
+               if(!prs_align(ps))
+                       return False;
+               if(!prs_uint32("ByteLength", ps, depth, &instance.ByteLength))
+                       return False;
+               if(!prs_uint32("ParentObjectTitleIndex", ps, depth, &instance.ParentObjectTitleIndex))
+                       return False;
+               if(!prs_uint32("ParentObjectTitlePointer", ps, depth, &instance.ParentObjectTitlePointer))
+                       return False;
+               if(!prs_uint32("UniqueID", ps, depth, &instance.UniqueID))
+                       return False;
+               if(!prs_uint32("NameOffset", ps, depth, &instance.NameOffset))
+                       return False;
+               if(!prs_uint32("NameLength", ps, depth, &instance.NameLength))
+                       return False;
+               if(!prs_uint8s(False, "InstanceName", ps, depth, instance.data,
+                              instance.ByteLength - instance.NameOffset))
+                       return False;
+               if(_reg_perfcount_marshall_perf_counter_data(ps, instance.counter_data, depth) == False)
+                       return False;
+       }
+       
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_marshall_perf_objects(prs_struct *ps, PERF_DATA_BLOCK block, int depth)
+{
+       int obj;
+
+       PERF_OBJECT_TYPE object;
+    
+       prs_debug(ps, depth, "", "_reg_perfcount_marshall_perf_objects");
+       depth++;
+
+       for(obj = 0; obj < block.NumObjectTypes; obj++)
+       {
+               object = block.objects[obj];
+
+               if(!prs_align(ps))
+                       return False;
+
+               if(!prs_uint32("TotalByteLength", ps, depth, &object.TotalByteLength))
+                       return False;
+               if(!prs_uint32("DefinitionLength", ps, depth, &object.DefinitionLength))
+                       return False;
+               if(!prs_uint32("HeaderLength", ps, depth, &object.HeaderLength))
+                       return False;
+               if(!prs_uint32("ObjectNameTitleIndex", ps, depth, &object.ObjectNameTitleIndex))
+                       return False;
+               if(!prs_uint32("ObjectNameTitlePointer", ps, depth, &object.ObjectNameTitlePointer))
+                       return False;
+               if(!prs_uint32("ObjectHelpTitleIndex", ps, depth, &object.ObjectHelpTitleIndex))
+                       return False;
+               if(!prs_uint32("ObjectHelpTitlePointer", ps, depth, &object.ObjectHelpTitlePointer))
+                       return False;
+               if(!prs_uint32("DetailLevel", ps, depth, &object.DetailLevel))
+                       return False;
+               if(!prs_uint32("NumCounters", ps, depth, &object.NumCounters))
+                       return False;
+               if(!prs_uint32("DefaultCounter", ps, depth, &object.DefaultCounter))
+                       return False;
+               if(!prs_uint32("NumInstances", ps, depth, &object.NumInstances))
+                       return False;
+               if(!prs_uint32("CodePage", ps, depth, &object.CodePage))
+                       return False;
+               if(!prs_align_uint64(ps))
+                       return False;
+               if(!prs_uint64("PerfTime", ps, depth, &object.PerfTime))
+                       return False;
+               if(!prs_uint64("PerfFreq", ps, depth, &object.PerfFreq))
+                       return False;
+
+               /* Now do the counters */
+               /* If no instances, encode counter_data */
+               /* If instances, encode instace plus counter data for each instance */
+               if(_reg_perfcount_marshall_perf_counters(ps, object, depth) == False)
+                       return False;
+               if(object.NumInstances == PERF_NO_INSTANCES)
+               {
+                       if(_reg_perfcount_marshall_perf_counter_data(ps, object.counter_data, depth) == False)
+                               return False;
+               }
+               else
+               {
+                       if(_reg_perfcount_marshall_perf_instances(ps, object, depth) == False)
+                               return False;
+               }
+       }
+
+       return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static BOOL _reg_perfcount_marshall_hkpd(prs_struct *ps, PERF_DATA_BLOCK block)
+{
+       int depth = 0;
+       if(_reg_perfcount_marshall_perf_data_block(ps, block, depth) == True)
+       {
+               if(_reg_perfcount_marshall_perf_objects(ps, block, depth) == True)
+                       return True;
+       }
+       return False;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+WERROR reg_perfcount_get_hkpd(prs_struct *ps, uint32 max_buf_size, uint32 *outbuf_len, char *object_ids)
+{
+       /*
+        * For a detailed description of the layout of this structure,
+        * see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/performance_data_format.asp
+        */
+       PERF_DATA_BLOCK block;
+       uint32 buffer_size, base_index; 
+    
+       buffer_size = 0;
+       base_index = reg_perfcount_get_base_index();
+       ZERO_STRUCT(block);
+
+       buffer_size = reg_perfcount_get_perf_data_block(base_index, ps, &block, object_ids);
+
+       if(buffer_size < max_buf_size)
+       {
+               *outbuf_len = buffer_size;
+               if(_reg_perfcount_marshall_hkpd(ps, block) == True)
+                       return WERR_OK;
+               else
+                       return WERR_NOMEM;
+       }
+       else
+       {
+               *outbuf_len = max_buf_size;
+               _reg_perfcount_marshall_perf_data_block(ps, block, 0);
+               return WERR_INSUFFICIENT_BUFFER;
+       }
+}