Finding a C struct or header in man pages?

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http://askubuntu.com – When programming in C, I like to use man sections 2 and 3 to look up the form of system and library calls. But I also often need to look up the form of a struct that is defined in a standard library. For example, sockaddr/sockaddr_un in 'sys/socket.h'. Is there any way I can look up structs or header files through man pages? (HowTos)