如何检查可用的数据量在C和Linux套接字 [英] How to check amount of data available for a socket in C and Linux

问题描述

我有接收数据的连续流的服务器。相对于从套接字读取多次，我想读取整个数据套接字接收一个系统调用缓冲到阅读（）。

I have a server that receives a continuous stream of data. As opposed to reading multiple times from a socket, I would like to read the entire data in socket receive buffer with one system call to read().

当然，我可以通过一个大的缓冲区和阅读（）将尝试与所有可用的数据来填充它。但是，这会浪费大量的内存，因为大多数的时代malloc分配的缓冲区会大于实际数据可用插槽。有没有一种方法来查询一个插座上的可用数据？

Of course I can pass a large buffer and read() will try to fill it with all available data. But this would waste a lot of memory as most of the times the malloc'ed buffer would be bigger than actual data available on socket. Is there a way to query the available data on a socket?

推荐答案

是：

#include <sys/ioctl.h>

...

int count;
ioctl(fd, FIONREAD, &count);

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