转自：Linux.协议栈分析.socket通过查看socket的帮助手册可以得到socket的定义形式为：Cint socket(int domain, int type, int protocol);domain的有效值如下:        AF_UNIX, AF_LOCAL   Local communication              unix(7)

Linux.协议栈分析.socket   SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol){int retval;struct socket *sock;int flags;/* Check the SOCK_* constants for consistency.