86 lines
3.7 KiB
C
86 lines
3.7 KiB
C
/*
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* Copyright (c) 2016, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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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 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* 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 "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "server.h"
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#include <unistd.h>
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/* Open a child-parent channel used in order to move information about the
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* RDB / AOF saving process from the child to the parent (for instance
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* the amount of copy on write memory used) */
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void openChildInfoPipe(void) {
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if (pipe(server.child_info_pipe) == -1) {
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/* On error our two file descriptors should be still set to -1,
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* but we call anyway cloesChildInfoPipe() since can't hurt. */
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closeChildInfoPipe();
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} else if (anetNonBlock(NULL,server.child_info_pipe[0]) != ANET_OK) {
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closeChildInfoPipe();
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} else {
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memset(&server.child_info_data,0,sizeof(server.child_info_data));
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}
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}
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/* Close the pipes opened with openChildInfoPipe(). */
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void closeChildInfoPipe(void) {
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if (server.child_info_pipe[0] != -1 ||
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server.child_info_pipe[1] != -1)
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{
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close(server.child_info_pipe[0]);
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close(server.child_info_pipe[1]);
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server.child_info_pipe[0] = -1;
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server.child_info_pipe[1] = -1;
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}
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}
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/* Send COW data to parent. The child should call this function after populating
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* the corresponding fields it want to sent (according to the process type). */
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void sendChildInfo(int ptype) {
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if (server.child_info_pipe[1] == -1) return;
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server.child_info_data.magic = CHILD_INFO_MAGIC;
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server.child_info_data.process_type = ptype;
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ssize_t wlen = sizeof(server.child_info_data);
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if (write(server.child_info_pipe[1],&server.child_info_data,wlen) != wlen) {
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/* Nothing to do on error, this will be detected by the other side. */
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}
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}
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/* Receive COW data from parent. */
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void receiveChildInfo(void) {
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if (server.child_info_pipe[0] == -1) return;
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ssize_t wlen = sizeof(server.child_info_data);
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if (read(server.child_info_pipe[0],&server.child_info_data,wlen) == wlen &&
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server.child_info_data.magic == CHILD_INFO_MAGIC)
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{
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if (server.child_info_data.process_type == CHILD_INFO_TYPE_RDB) {
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server.stat_rdb_cow_bytes = server.child_info_data.cow_size;
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} else if (server.child_info_data.process_type == CHILD_INFO_TYPE_AOF) {
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server.stat_aof_cow_bytes = server.child_info_data.cow_size;
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}
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}
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}
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