The close system call closes or aborts any pending connections on the socket.
close 系统调用可关闭或中止套接字上任何挂起的连接。
Figure 12 shows the important calls that occur when the close system call is issued by a TCP application.
图 12 显示了 TCP 应用程序发布 close 系统调用时发生的重要调用。
Suppose a signal is generated during the very small time gap between setting the errno variable by the close system call and its return.
假定信号在close系统调用设置errno变量到其返回之前这一极小的时间片段内生成。
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