source: trunk/server/source3/lib/tallocmsg.c

/* 
   samba -- Unix SMB/CIFS implementation.
   Copyright (C) 2001, 2002 by Martin Pool

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "messages.h"

/**
 * @file tallocmsg.c
 *
 * Glue code between talloc profiling and the Samba messaging system.
 **/

struct msg_pool_usage_state {
        TALLOC_CTX *mem_ctx;
        ssize_t len;
        size_t buflen;
        char *s;
};

static void msg_pool_usage_helper(const void *ptr, int depth, int max_depth, int is_ref, void *_s)
{
        const char *name = talloc_get_name(ptr);
        struct msg_pool_usage_state *state = (struct msg_pool_usage_state *)_s;

        if (is_ref) {
                sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
                               "%*sreference to: %s\n", depth*4, "", name);
                return;
        }

        if (depth == 0) {
                sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
                               "%stalloc report on '%s' (total %6lu bytes in %3lu blocks)\n", 
                               (max_depth < 0 ? "full " :""), name,
                               (unsigned long)talloc_total_size(ptr),
                               (unsigned long)talloc_total_blocks(ptr));
                return;
        }

        if (strcmp(name, "char") == 0) {
                /*
                 * Print out the first 50 bytes of the string
                 */
                sprintf_append(state->mem_ctx, &state->s, &state->len,
                               &state->buflen,
                               "%*s%-30s contains %6lu bytes in %3lu blocks "
                               "(ref %d): %*s\n", depth*4, "",
                               name,
                               (unsigned long)talloc_total_size(ptr),
                               (unsigned long)talloc_total_blocks(ptr),
                               talloc_reference_count(ptr),
                               MIN(50, talloc_get_size(ptr)),
                               (char *)ptr);
                return;
        }

        sprintf_append(state->mem_ctx, &state->s, &state->len, &state->buflen,
                       "%*s%-30s contains %6lu bytes in %3lu blocks (ref %d)\n", 
                       depth*4, "",
                       name,
                       (unsigned long)talloc_total_size(ptr),
                       (unsigned long)talloc_total_blocks(ptr),
                       talloc_reference_count(ptr));
}

/**
 * Respond to a POOL_USAGE message by sending back string form of memory
 * usage stats.
 **/
static void msg_pool_usage(struct messaging_context *msg_ctx,
                           void *private_data, 
                           uint32_t msg_type, 
                           struct server_id src,
                           DATA_BLOB *data)
{
        struct msg_pool_usage_state state;

        SMB_ASSERT(msg_type == MSG_REQ_POOL_USAGE);

        DEBUG(2,("Got POOL_USAGE\n"));

        state.mem_ctx = talloc_init("msg_pool_usage");
        if (!state.mem_ctx) {
                return;
        }
        state.len       = 0;
        state.buflen    = 512;
        state.s         = NULL;

        talloc_report_depth_cb(NULL, 0, -1, msg_pool_usage_helper, &state);

        if (!state.s) {
                talloc_destroy(state.mem_ctx);
                return;
        }

        messaging_send_buf(msg_ctx, src, MSG_POOL_USAGE,
                           (uint8 *)state.s, strlen(state.s)+1);

        talloc_destroy(state.mem_ctx);
}

/**
 * Register handler for MSG_REQ_POOL_USAGE
 **/
void register_msg_pool_usage(struct messaging_context *msg_ctx)
{
        messaging_register(msg_ctx, NULL, MSG_REQ_POOL_USAGE, msg_pool_usage);
        DEBUG(2, ("Registered MSG_REQ_POOL_USAGE\n"));
}