how can I call tcp related functions in kernel space of hpux11.11

[yf]

Dears all,
        recently I wrote a filesystem client under some platforms, which
include Linux, Solaris, SunOS, AIX, and HPUX.
        But I encounter some problems, I don't know how to use AIX' tcp
soreceive() to receive msg correctly. And I don't know where is the tcp
related ops in HPUX kernel, where is its headers.
        I wonder who could or will give me some help.

Best regards.

/yf