setlocale(LC_COLLATE,""); 设置时区
updateCachedTime(1); 非实时获取操作系统时间，会缓存
getRandomHexChars(server.runid,CONFIG_RUN_ID_SIZE); hash种子设置，用于字典数据结构的siphash算法
server.sentinel_mode = checkForSentinelMode(argc,argv, exec_name);
int checkForSentinelMode(int argc, char **argv, char *exec_name) {
if (strstr(exec_name,"redis-sentinel") != NULL) return 1;
for (int j = 1; j < argc; j++)
if (!strcmp(argv[j],"--sentinel")) return 1;
return 0;
} 判断是否哨兵模式
initServerConfig方法用于初始化redisServer
void initServerConfig(void) {
int j;
char *default_bindaddr[CONFIG_DEFAULT_BINDADDR_COUNT] = CONFIG_DEFAULT_BINDADDR;
initConfigValues();
updateCachedTime(1);
getRandomHexChars(server.runid,CONFIG_RUN_ID_SIZE);
server.runid[CONFIG_RUN_ID_SIZE] = '\0';
changeReplicationId();
clearReplicationId2();
server.hz = CONFIG_DEFAULT_HZ; /* Initialize it ASAP, even if it may get
updated later after loading the config.
This value may be used before the server
is initialized. */
server.timezone = getTimeZone(); /* Initialized by tzset(). */
server.configfile = NULL;
server.executable = NULL;
server.arch_bits = (sizeof(long) == 8) ? 64 : 32;
server.bindaddr_count = CONFIG_DEFAULT_BINDADDR_COUNT;
for (j = 0; j < CONFIG_DEFAULT_BINDADDR_COUNT; j++)
server.bindaddr[j] = zstrdup(default_bindaddr[j]);
server.ipfd.count = 0;
server.tlsfd.count = 0;
server.sofd = -1;
server.active_expire_enabled = 1;
server.skip_checksum_validation = 0;
server.loading = 0;
server.async_loading = 0;
server.loading_rdb_used_mem = 0;
server.aof_state = AOF_OFF;
server.aof_rewrite_base_size = 0;
server.aof_rewrite_scheduled = 0;
server.aof_flush_sleep = 0;
server.aof_last_fsync = time(NULL);
server.aof_cur_timestamp = 0;
atomicSet(server.aof_bio_fsync_status,C_OK);
server.aof_rewrite_time_last = -1;
server.aof_rewrite_time_start = -1;
server.aof_lastbgrewrite_status = C_OK;
server.aof_delayed_fsync = 0;
server.aof_fd = -1;
server.aof_selected_db = -1; /* Make sure the first time will not match */
server.aof_flush_postponed_start = 0;
server.aof_last_incr_size = 0;
server.active_defrag_running = 0;
server.notify_keyspace_events = 0;
server.blocked_clients = 0;
memset(server.blocked_clients_by_type,0,
sizeof(server.blocked_clients_by_type));
server.shutdown_asap = 0;
server.shutdown_flags = 0;
server.shutdown_mstime = 0;
server.cluster_module_flags = CLUSTER_MODULE_FLAG_NONE;
server.migrate_cached_sockets = dictCreate(&migrateCacheDictType);
server.next_client_id = 1; /* Client IDs, start from 1 .*/
server.page_size = sysconf(_SC_PAGESIZE);
server.pause_cron = 0;
server.latency_tracking_info_percentiles_len = 3;
server.latency_tracking_info_percentiles = zmalloc(sizeof(double)*(server.latency_tracking_info_percentiles_len));
server.latency_tracking_info_percentiles[0] = 50.0; /* p50 */
server.latency_tracking_info_percentiles[1] = 99.0; /* p99 */
server.latency_tracking_info_percentiles[2] = 99.9; /* p999 */
unsigned int lruclock = getLRUClock();
atomicSet(server.lruclock,lruclock);
resetServerSaveParams();
appendServerSaveParams(60*60,1); /* save after 1 hour and 1 change */
appendServerSaveParams(300,100); /* save after 5 minutes and 100 changes */
appendServerSaveParams(60,10000); /* save after 1 minute and 10000 changes */
/* Replication related */
server.masterhost = NULL;
server.masterport = 6379;
server.master = NULL;
server.cached_master = NULL;
server.master_initial_offset = -1;
server.repl_state = REPL_STATE_NONE;
server.repl_transfer_tmpfile = NULL;
server.repl_transfer_fd = -1;
server.repl_transfer_s = NULL;
server.repl_syncio_timeout = CONFIG_REPL_SYNCIO_TIMEOUT;
server.repl_down_since = 0; /* Never connected, repl is down since EVER. */
server.master_repl_offset = 0;
/* Replication partial resync backlog */
server.repl_backlog = NULL;
server.repl_no_slaves_since = time(NULL);
/* Failover related */
server.failover_end_time = 0;
server.force_failover = 0;
server.target_replica_host = NULL;
server.target_replica_port = 0;
server.failover_state = NO_FAILOVER;
/* Client output buffer limits */
for (j = 0; j < CLIENT_TYPE_OBUF_COUNT; j++)
server.client_obuf_limits[j] = clientBufferLimitsDefaults[j];
/* Linux OOM Score config */
for (j = 0; j < CONFIG_OOM_COUNT; j++)
server.oom_score_adj_values[j] = configOOMScoreAdjValuesDefaults[j];
/* Double constants initialization */
R_Zero = 0.0;
R_PosInf = 1.0/R_Zero;
R_NegInf = -1.0/R_Zero;
R_Nan = R_Zero/R_Zero;
/* Command table -- we initialize it here as it is part of the
* initial configuration, since command names may be changed via
* redis.conf using the rename-command directive. */
server.commands = dictCreate(&commandTableDictType);
server.orig_commands = dictCreate(&commandTableDictType);
populateCommandTable();
/* Debugging */
server.watchdog_period = 0;
}
loadServerConfig方法用于加载配置文件daemonize方法用于后台运行
setsid()：确保当前进程变为新会话的会话头进程以及新进程组的进程组头进程，从而不再受终端控制。
忽略SIGHUP信号之后再次fork目的是确保本守护进程将来即使打开一个终端设备，也不会自动获取终端。
当没有控制终端的一个会话头进程打开一个控制终端时，该终端自动成为这个会话头进程的控制终端。然后再次fork之后，
我们确保新的子进程不再是一个会话头进程，从而不能自动获取一个控制终端。这里必须要忽略SIGHUP信号，
因为会话头进程(即首次fork产生的子进程)终止时，其会话中的所有进程(即再次fork的子进程)都会收到SIGHUP信号。
更改根路径。
关闭继承来的所有套接字
重定向stdin、stdout和stderr，否则他会输出到屏幕上
void daemonize(void) {
int fd;
if (fork() != 0) exit(0); /* parent exits */
setsid(); /* create a new session */
/* Every output goes to /dev/null. If Redis is daemonized but
* the 'logfile' is set to 'stdout' in the configuration file
* it will not log at all. */
if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > STDERR_FILENO) close(fd);
}
}
adjustOpenFilesLimit(); 根据系统限制调整打开得文件数aeCreateEventLoop方法用于网络模型的初始化evictionPoolAlloc(); LRU策略中过期池初始化scriptingInit(1); lua脚本相关loadDataFromDisk 方法用于加载磁盘数据，优先加载AOF
