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a85b5759f3
These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
287 lines
8.6 KiB
C
287 lines
8.6 KiB
C
/*
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* util/shm_side/shm_main.c - SHM for statistics transport
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*
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* Copyright (c) 2017, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions for the SHM implementation.
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*/
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#include "config.h"
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#include <ctype.h>
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#include <stdarg.h>
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#ifdef HAVE_SYS_IPC_H
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#include <sys/ipc.h>
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#endif
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#ifdef HAVE_SYS_SHM_H
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#include <sys/shm.h>
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#endif
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#include <sys/time.h>
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#include <errno.h>
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#include "shm_main.h"
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#include "daemon/daemon.h"
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#include "daemon/worker.h"
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#include "daemon/stats.h"
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#include "services/mesh.h"
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#include "services/cache/rrset.h"
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#include "services/cache/infra.h"
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#include "validator/validator.h"
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#include "util/config_file.h"
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#include "util/fptr_wlist.h"
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#include "util/log.h"
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#ifdef HAVE_SHMGET
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/** subtract timers and the values do not overflow or become negative */
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static void
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timeval_subtract(struct timeval* d, const struct timeval* end,
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const struct timeval* start)
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{
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#ifndef S_SPLINT_S
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time_t end_usec = end->tv_usec;
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d->tv_sec = end->tv_sec - start->tv_sec;
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if(end_usec < start->tv_usec) {
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end_usec += 1000000;
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d->tv_sec--;
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}
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d->tv_usec = end_usec - start->tv_usec;
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#endif
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}
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#endif /* HAVE_SHMGET */
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int shm_main_init(struct daemon* daemon)
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{
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#ifdef HAVE_SHMGET
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struct shm_stat_info *shm_stat;
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size_t shm_size;
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/* sanitize */
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if(!daemon)
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return 0;
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if(!daemon->cfg->shm_enable)
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return 1;
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if(daemon->cfg->stat_interval == 0)
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log_warn("shm-enable is yes but statistics-interval is 0");
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/* Statistics to maintain the number of thread + total */
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shm_size = (sizeof(struct stats_info) * (daemon->num + 1));
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/* Allocation of needed memory */
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daemon->shm_info = (struct shm_main_info*)calloc(1, shm_size);
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/* Sanitize */
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if(!daemon->shm_info) {
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log_err("shm fail: malloc failure");
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return 0;
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}
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daemon->shm_info->key = daemon->cfg->shm_key;
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/* Check for previous create SHM */
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daemon->shm_info->id_ctl = shmget(daemon->shm_info->key, sizeof(int), SHM_R);
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daemon->shm_info->id_arr = shmget(daemon->shm_info->key + 1, sizeof(int), SHM_R);
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/* Destroy previous SHM */
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if (daemon->shm_info->id_ctl >= 0)
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shmctl(daemon->shm_info->id_ctl, IPC_RMID, NULL);
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/* Destroy previous SHM */
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if (daemon->shm_info->id_arr >= 0)
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shmctl(daemon->shm_info->id_arr, IPC_RMID, NULL);
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/* SHM: Create the segment */
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daemon->shm_info->id_ctl = shmget(daemon->shm_info->key, sizeof(struct shm_stat_info), IPC_CREAT | 0666);
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if (daemon->shm_info->id_ctl < 0)
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{
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log_err("SHM failed(id_ctl) cannot shmget(key %d) %s",
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daemon->shm_info->key, strerror(errno));
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/* Just release memory unused */
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free(daemon->shm_info);
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return 0;
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}
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daemon->shm_info->id_arr = shmget(daemon->shm_info->key + 1, shm_size, IPC_CREAT | 0666);
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if (daemon->shm_info->id_arr < 0)
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{
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log_err("SHM failed(id_arr) cannot shmget(key %d + 1) %s",
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daemon->shm_info->key, strerror(errno));
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/* Just release memory unused */
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free(daemon->shm_info);
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return 0;
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}
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/* SHM: attach the segment */
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daemon->shm_info->ptr_ctl = (struct shm_stat_info*)
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shmat(daemon->shm_info->id_ctl, NULL, 0);
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if(daemon->shm_info->ptr_ctl == (void *) -1) {
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log_err("SHM failed(ctl) cannot shmat(%d) %s",
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daemon->shm_info->id_ctl, strerror(errno));
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/* Just release memory unused */
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free(daemon->shm_info);
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return 0;
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}
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daemon->shm_info->ptr_arr = (struct stats_info*)
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shmat(daemon->shm_info->id_arr, NULL, 0);
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if (daemon->shm_info->ptr_arr == (void *) -1)
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{
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log_err("SHM failed(arr) cannot shmat(%d) %s",
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daemon->shm_info->id_arr, strerror(errno));
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/* Just release memory unused */
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free(daemon->shm_info);
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return 0;
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}
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/* Zero fill SHM to stand clean while is not filled by other events */
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memset(daemon->shm_info->ptr_ctl, 0, sizeof(struct shm_stat_info));
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memset(daemon->shm_info->ptr_arr, 0, shm_size);
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shm_stat = daemon->shm_info->ptr_ctl;
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shm_stat->num_threads = daemon->num;
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#else
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(void)daemon;
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#endif /* HAVE_SHMGET */
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return 1;
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}
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void shm_main_shutdown(struct daemon* daemon)
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{
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#ifdef HAVE_SHMGET
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/* web are OK, just disabled */
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if(!daemon->cfg->shm_enable)
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return;
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verbose(VERB_DETAIL, "SHM shutdown - KEY [%d] - ID CTL [%d] ARR [%d] - PTR CTL [%p] ARR [%p]",
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daemon->shm_info->key, daemon->shm_info->id_ctl, daemon->shm_info->id_arr, daemon->shm_info->ptr_ctl, daemon->shm_info->ptr_arr);
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/* Destroy previous SHM */
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if (daemon->shm_info->id_ctl >= 0)
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shmctl(daemon->shm_info->id_ctl, IPC_RMID, NULL);
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if (daemon->shm_info->id_arr >= 0)
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shmctl(daemon->shm_info->id_arr, IPC_RMID, NULL);
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if (daemon->shm_info->ptr_ctl)
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shmdt(daemon->shm_info->ptr_ctl);
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if (daemon->shm_info->ptr_arr)
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shmdt(daemon->shm_info->ptr_arr);
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#else
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(void)daemon;
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#endif /* HAVE_SHMGET */
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}
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void shm_main_run(struct worker *worker)
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{
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#ifdef HAVE_SHMGET
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struct shm_stat_info *shm_stat;
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struct stats_info *stat_total;
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struct stats_info *stat_info;
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int modstack;
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int offset;
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verbose(VERB_DETAIL, "SHM run - worker [%d] - daemon [%p] - timenow(%u) - timeboot(%u)",
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worker->thread_num, worker->daemon, (unsigned)worker->env.now_tv->tv_sec, (unsigned)worker->daemon->time_boot.tv_sec);
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offset = worker->thread_num + 1;
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stat_total = worker->daemon->shm_info->ptr_arr;
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stat_info = worker->daemon->shm_info->ptr_arr + offset;
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/* Copy data to the current position */
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server_stats_compile(worker, stat_info, 0);
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/* First thread, zero fill total, and copy general info */
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if (worker->thread_num == 0) {
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/* Copy data to the current position */
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memset(stat_total, 0, sizeof(struct stats_info));
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/* Point to data into SHM */
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shm_stat = worker->daemon->shm_info->ptr_ctl;
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shm_stat->time.now = *worker->env.now_tv;
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timeval_subtract(&shm_stat->time.up, &shm_stat->time.now, &worker->daemon->time_boot);
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timeval_subtract(&shm_stat->time.elapsed, &shm_stat->time.now, &worker->daemon->time_last_stat);
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shm_stat->mem.msg = slabhash_get_mem(worker->env.msg_cache);
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shm_stat->mem.rrset = slabhash_get_mem(&worker->env.rrset_cache->table);
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shm_stat->mem.val = 0;
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shm_stat->mem.iter = 0;
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modstack = modstack_find(&worker->env.mesh->mods, "validator");
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if(modstack != -1) {
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fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->mods.mod[modstack]->get_mem));
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shm_stat->mem.val = (*worker->env.mesh->mods.mod[modstack]->get_mem)(&worker->env, modstack);
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}
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modstack = modstack_find(&worker->env.mesh->mods, "iterator");
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if(modstack != -1) {
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fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->mods.mod[modstack]->get_mem));
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shm_stat->mem.iter = (*worker->env.mesh->mods.mod[modstack]->get_mem)(&worker->env, modstack);
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}
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/* subnet mem value is available in shm, also when not enabled,
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* to make the struct easier to memmap by other applications,
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* independent of the configuration of unbound */
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shm_stat->mem.subnet = 0;
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#ifdef CLIENT_SUBNET
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modstack = modstack_find(&worker->env.mesh->mods, "subnet");
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if(modstack != -1) {
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fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->mods.mod[modstack]->get_mem));
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shm_stat->mem.subnet = (*worker->env.mesh->mods.mod[modstack]->get_mem)(&worker->env, modstack);
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}
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#endif
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}
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server_stats_add(stat_total, stat_info);
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/* print the thread statistics */
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stat_total->mesh_time_median /= (double)worker->daemon->num;
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#else
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(void)worker;
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#endif /* HAVE_SHMGET */
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}
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