# swoole_client->sendfile
发送文件到服务器，本函数是基于sendfile操作系统调用的。在swoole-1.7.5以上版本可用。
~~~
bool swoole_client->sendfile(string $filename)
~~~
- $filename指定要发送文件的路径
- 如果传入的文件不存在，将返回false
> 如果是同步client，sendfile会一直阻塞直到整个文件发送完毕或者发生致命错误
如果是异步client，sendfile会异步发送，当发生致命错误时会回调onError
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