Squid internals

IPC (src/ipc.c) (ctd.)
How it is used
retval = ipcCreate(type, prog, argv, description, &rfd, &wfd)
type is ICP_TCP_SOCKET, ICP_UDP_SOCKET, ICP_FIFO
description goes in the fd description
the &rfd and &wfd are pointers to the read and write fds, and are set on success
retval is -1 on error, 0 on success