http://www.91linux.com/html/article/program/cpp/20081017/13581.html

http://docs.sun.com/source/806-3567/

cscope: Interactively Examining a C Program

http://docs.sun.com/source/806-3567/cscope.html

文件控制函数
    fcntl -- file control

LIBRARY
    Standard C Library (libc, -lc)

SYNOPSIS
    #include <fcntl.h>;

    int
    fcntl(int fd, int cmd, ...);

DESCRIPTION
    Fcntl() provides for control over descriptors.   The argument fd is a
    descriptor to be operated on by cmd as described below.