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/*
* Copyright (c) 2016, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "server.h"
#include <unistd.h>
/* Open a child-parent channel used in order to move information about the
* RDB / AOF saving process from the child to the parent (for instance
* the amount of copy on write memory used) */
void openChildInfoPipe(void) {
if (pipe(server.child_info_pipe) == -1) {
/* On error our two file descriptors should be still set to -1,
* but we call anyway cloesChildInfoPipe() since can't hurt. */
closeChildInfoPipe();
} else if (anetNonBlock(NULL,server.child_info_pipe[0]) != ANET_OK) {
closeChildInfoPipe();
} else {
memset(&server.child_info_data,0,sizeof(server.child_info_data));
}
}
/* Close the pipes opened with openChildInfoPipe(). */
void closeChildInfoPipe(void) {
if (server.child_info_pipe[0] != -1 ||
server.child_info_pipe[1] != -1)
{
close(server.child_info_pipe[0]);
close(server.child_info_pipe[1]);
server.child_info_pipe[0] = -1;
server.child_info_pipe[1] = -1;
}
}
/* Send COW data to parent. The child should call this function after populating
* the corresponding fields it want to sent (according to the process type). */
void sendChildInfo(int ptype) {
if (server.child_info_pipe[1] == -1) return;
server.child_info_data.magic = CHILD_INFO_MAGIC;
server.child_info_data.process_type = ptype;
ssize_t wlen = sizeof(server.child_info_data);
if (write(server.child_info_pipe[1],&server.child_info_data,wlen) != wlen) {
/* Nothing to do on error, this will be detected by the other side. */
}
}
/* Receive COW data from parent. */
void receiveChildInfo(void) {
if (server.child_info_pipe[0] == -1) return;
ssize_t wlen = sizeof(server.child_info_data);
if (read(server.child_info_pipe[0],&server.child_info_data,wlen) == wlen &&
server.child_info_data.magic == CHILD_INFO_MAGIC)
{
if (server.child_info_data.process_type == CHILD_INFO_TYPE_RDB) {
server.stat_rdb_cow_bytes = server.child_info_data.cow_size;
} else if (server.child_info_data.process_type == CHILD_INFO_TYPE_AOF) {
server.stat_aof_cow_bytes = server.child_info_data.cow_size;
}
}
}
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