source3/lib/tallocmsg.c

   1 /*
   2    samba -- Unix SMB/CIFS implementation.
   3    Copyright (C) 2001, 2002 by Martin Pool
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include "includes.h"
  20 #include "messages.h"
  21
  22 /**
  23  * @file tallocmsg.c
  24  *
  25  * Glue code between talloc profiling and the Samba messaging system.
  26  **/
  27
  28 struct msg_pool_usage_state {
  29         TALLOC_CTX *mem_ctx;
  30         ssize_t len;
  31         size_t buflen;
  32         char *s;
  33 };
  34
  35 static void msg_pool_usage_helper(const void *ptr, int depth, int max_depth, int is_ref, void *_s)
  36 {
  37         const char *name = talloc_get_name(ptr);
  38         struct msg_pool_usage_state *state = (struct msg_pool_usage_state *)_s;
  39
  40         if (is_ref) {
  41                 sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
  42                                "%*sreference to: %s\n", depth*4, "", name);
  43                 return;
  44         }
  45
  46         if (depth == 0) {
  47                 sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
  48                                "%stalloc report on '%s' (total %6lu bytes in %3lu blocks)\n",
  49                                (max_depth < 0 ? "full " :""), name,
  50                                (unsigned long)talloc_total_size(ptr),
  51                                (unsigned long)talloc_total_blocks(ptr));
  52                 return;
  53         }
  54
  55         if (strcmp(name, "char") == 0) {
  56                 /*
  57                  * Print out the first 50 bytes of the string
  58                  */
  59                 sprintf_append(state->mem_ctx, &state->s, &state->len,
  60                                &state->buflen,
  61                                "%*s%-30s contains %6lu bytes in %3lu blocks "
  62                                "(ref %d): %*s\n", depth*4, "",
  63                                name,
  64                                (unsigned long)talloc_total_size(ptr),
  65                                (unsigned long)talloc_total_blocks(ptr),
  66                                talloc_reference_count(ptr),
  67                                MIN(50, talloc_get_size(ptr)),
  68                                (char *)ptr);
  69                 return;
  70         }
  71
  72         sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
  73                        "%*s%-30s contains %6lu bytes in %3lu blocks (ref %d)\n",
  74                        depth*4, "",
  75                        name,
  76                        (unsigned long)talloc_total_size(ptr),
  77                        (unsigned long)talloc_total_blocks(ptr),
  78                        talloc_reference_count(ptr));
  79 }
  80
  81 /**
  82  * Respond to a POOL_USAGE message by sending back string form of memory
  83  * usage stats.
  84  **/
  85 static void msg_pool_usage(struct messaging_context *msg_ctx,
  86                            void *private_data,
  87                            uint32_t msg_type,
  88                            struct server_id src,
  89                            DATA_BLOB *data)
  90 {
  91         struct msg_pool_usage_state state;
  92
  93         SMB_ASSERT(msg_type == MSG_REQ_POOL_USAGE);
  94
  95         DEBUG(2,("Got POOL_USAGE\n"));
  96
  97         state.mem_ctx = talloc_init("msg_pool_usage");
  98         if (!state.mem_ctx) {
  99                 return;
 100         }
 101         state.len       = 0;
 102         state.buflen    = 512;
 103         state.s         = NULL;
 104
 105         talloc_report_depth_cb(NULL, 0, -1, msg_pool_usage_helper, &state);
 106
 107         if (!state.s) {
 108                 talloc_destroy(state.mem_ctx);
 109                 return;
 110         }
 111
 112         messaging_send_buf(msg_ctx, src, MSG_POOL_USAGE,
 113                            (uint8 *)state.s, strlen(state.s)+1);
 114
 115         talloc_destroy(state.mem_ctx);
 116 }
 117
 118 /**
 119  * Register handler for MSG_REQ_POOL_USAGE
 120  **/
 121 void register_msg_pool_usage(struct messaging_context *msg_ctx)
 122 {
 123         messaging_register(msg_ctx, NULL, MSG_REQ_POOL_USAGE, msg_pool_usage);
 124         DEBUG(2, ("Registered MSG_REQ_POOL_USAGE\n"));
 125 }