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
  21 /**
  22  * @file tallocmsg.c
  23  *
  24  * Glue code between talloc profiling and the Samba messaging system.
  25  **/
  26
  27 struct msg_pool_usage_state {
  28         TALLOC_CTX *mem_ctx;
  29         ssize_t len;
  30         size_t buflen;
  31         char *s;
  32 };
  33
  34 static void msg_pool_usage_helper(const void *ptr, int depth, int max_depth, int is_ref, void *_s)
  35 {
  36         const char *name = talloc_get_name(ptr);
  37         struct msg_pool_usage_state *state = (struct msg_pool_usage_state *)_s;
  38
  39         if (is_ref) {
  40                 sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
  41                                "%*sreference to: %s\n", depth*4, "", name);
  42                 return;
  43         }
  44
  45         if (depth == 0) {
  46                 sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
  47                                "%stalloc report on '%s' (total %6lu bytes in %3lu blocks)\n",
  48                                (max_depth < 0 ? "full " :""), name,
  49                                (unsigned long)talloc_total_size(ptr),
  50                                (unsigned long)talloc_total_blocks(ptr));
  51                 return;
  52         }
  53
  54         if (strcmp(name, "char") == 0) {
  55                 /*
  56                  * Print out the first 50 bytes of the string
  57                  */
  58                 sprintf_append(state->mem_ctx, &state->s, &state->len,
  59                                &state->buflen,
  60                                "%*s%-30s contains %6lu bytes in %3lu blocks "
  61                                "(ref %d): %*s\n", depth*4, "",
  62                                name,
  63                                (unsigned long)talloc_total_size(ptr),
  64                                (unsigned long)talloc_total_blocks(ptr),
  65                                talloc_reference_count(ptr),
  66                                MIN(50, talloc_get_size(ptr)),
  67                                (char *)ptr);
  68                 return;
  69         }
  70
  71         sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
  72                        "%*s%-30s contains %6lu bytes in %3lu blocks (ref %d)\n",
  73                        depth*4, "",
  74                        name,
  75                        (unsigned long)talloc_total_size(ptr),
  76                        (unsigned long)talloc_total_blocks(ptr),
  77                        talloc_reference_count(ptr));
  78 }
  79
  80 /**
  81  * Respond to a POOL_USAGE message by sending back string form of memory
  82  * usage stats.
  83  **/
  84 static void msg_pool_usage(struct messaging_context *msg_ctx,
  85                            void *private_data,
  86                            uint32_t msg_type,
  87                            struct server_id src,
  88                            DATA_BLOB *data)
  89 {
  90         struct msg_pool_usage_state state;
  91
  92         SMB_ASSERT(msg_type == MSG_REQ_POOL_USAGE);
  93
  94         DEBUG(2,("Got POOL_USAGE\n"));
  95
  96         state.mem_ctx = talloc_init("msg_pool_usage");
  97         if (!state.mem_ctx) {
  98                 return;
  99         }
 100         state.len       = 0;
 101         state.buflen    = 512;
 102         state.s         = NULL;
 103
 104         talloc_report_depth_cb(NULL, 0, -1, msg_pool_usage_helper, &state);
 105
 106         if (!state.s) {
 107                 talloc_destroy(state.mem_ctx);
 108                 return;
 109         }
 110
 111         messaging_send_buf(msg_ctx, src, MSG_POOL_USAGE,
 112                            (uint8 *)state.s, strlen(state.s)+1);
 113
 114         talloc_destroy(state.mem_ctx);
 115 }
 116
 117 /**
 118  * Register handler for MSG_REQ_POOL_USAGE
 119  **/
 120 void register_msg_pool_usage(struct messaging_context *msg_ctx)
 121 {
 122         messaging_register(msg_ctx, NULL, MSG_REQ_POOL_USAGE, msg_pool_usage);
 123         DEBUG(2, ("Registered MSG_REQ_POOL_USAGE\n"));
 124 }