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2. 具有选取或环状珊瑚的ud粒体积
原标题:know udp packet size with poll select or epoll

我知道,在阅读你可以向格鲁斯女士发出这一回忆之前,可以发现ud包的大小:

ioctl(s,FIONREAD,&num_bytes);

但是,我能否发现与以下一项呼吁相同?

poll()
select()
epoll()

The key is to know the size of the datagram before reading it, to allocate space for the buffer. This is for linux only, in C.

最佳回答

诸如pollslect等多重星座正在预计有一套观察条件(如第5号数字所示,第7号数字可能产生产出),并告诉你哪些文字说明可以读(哪些是可解释的)。 您一旦知道哪些文件说明员可以读到,您可使用ioctl(fd, FIONREAD, &numbytes)。 因此,你应当使用<条码> 波尔图/代码>,然后使用<条码>。

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