Hi,
I'm using minix and I don't know how to use API POSIX (I've read ipc.h 
), someone could help me?
Thank you 
You want to use the POSIX API -- all of it? That'll take a long time to explain! 
Please be more specific.
_send and _receive
See 'man send' and 'man receive'. The UNIX forums have online manpages if your system doesn't have them installed.