Function bgsaveCommand

app/redis-6.2.6/src/rdb.c:2988–3022

BGSAVE [SCHEDULE] */

/* BGSAVE [SCHEDULE] */
void bgsaveCommand(client *c) {
    int schedule = 0;

    /* The SCHEDULE option changes the behavior of BGSAVE when an AOF rewrite
     * is in progress. Instead of returning an error a BGSAVE gets scheduled. */
    if (c->argc > 1) {
        if (c->argc == 2 && !strcasecmp(c->argv[1]->ptr,"schedule")) {
            schedule = 1;
        } else {
            addReplyErrorObject(c,shared.syntaxerr);
            return;
        }
    }

    rdbSaveInfo rsi, *rsiptr;
    rsiptr = rdbPopulateSaveInfo(&rsi);

    if (server.child_type == CHILD_TYPE_RDB) {
        addReplyError(c,"Background save already in progress");
    } else if (hasActiveChildProcess()) {
        if (schedule) {
            server.rdb_bgsave_scheduled = 1;
            addReplyStatus(c,"Background saving scheduled");
        } else {
            addReplyError(c,
            "Another child process is active (AOF?): can't BGSAVE right now. "
            "Use BGSAVE SCHEDULE in order to schedule a BGSAVE whenever "
            "possible.");
        }
    } else if (rdbSaveBackground(server.rdb_filename,rsiptr) == C_OK) {
        addReplyStatus(c,"Background saving started");
    } else {
        addReplyErrorObject(c,shared.err);
    }
}

/* Populate the rdbSaveInfo structure used to persist the replication
 * information inside the RDB file. Currently the structure explicitly