It maintains the file descriptor state on the requested file descriptor set across system calls.
它跨系统调用在请求的文件描述符集上维护文件描述符状态。
The BAR file contains the deployment descriptor, compiled message flows, and message set definitions.
BAR文件包含部署描述符、已编译的消息流和消息集定义。
The pollset interface creates and maintains a file descriptor set and its interested events in the native (kernel) pollset layer.
pollset 接口在本机（内核）pollset 层中创建并维护一个文件描述符集和感兴趣的事件。
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