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请问下各位大佬一个关于setsockopt函数的level参数问题?

我man帮助手册的时候,level参数只看到有SOL_SOCKET
For example, to indicate that an option is to be interpreted by the TCP protocol, level should be set to the protocol number of TCP; see getprotoent(3).
虽然有上述的描述,但我不知道怎么从man手册里找出其他level参数的宏,请问怎么能man到level的其他参数?百度我知道可以找到,我就是想知道大佬们是从帮助手册哪里找到的参数,想学习看man手册


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