图片修改

kvs_slave.c

@@ -25,6 +25,21 @@ static int kvs_write_u32(uint8_t **pp, uint32_t v) {
 	return 0;
 }
 
+static uint64_t kvs_get_log_tail_offset(void) {
+    int fd = open("kvs_cmd_log.db", O_RDONLY);
+    if (fd < 0) {
+        // 文件不存在：从 0 开始同步
+        if (errno == ENOENT) return 0;
+        // 其他错误：保守起见从 0 开始
+        return 0;
+    }
+
+    off_t end = lseek(fd, 0, SEEK_END);
+    close(fd);
+
+    if (end < 0) return 0;
+    return (uint64_t)end;   // 指向 EOF（下一次写入的位置）
+}
 
 int try_connect_master(char *ip, int port){
     
@@ -53,10 +68,9 @@ int try_connect_master(char *ip, int port){
             uint64_t len = sizeof(uint64_t);
             kvs_write_u32((uint8_t**)&p, len);
 
-            uint64_t offset = 0;            
+            uint64_t offset = kvs_get_log_tail_offset(); 
             memcpy(p, (void*)&offset, len);
-            
-            p += len;
+            p += sizeof(offset);
 
             send(fd, buf, p-buf, 0);
             recv(fd, buf, 100, 0);