一个linux环境下的模拟文件系统的程序，里面有使用说明，能够创建，删除，复制文件，用到了linux共享内存和信号量，另外有个shell程序进程与文件系统程序进行通信。-A linux file system environment, the simulation program, which has instructions for use, the ability to create, delete, copy files, use a linux shared memory and sem

這是一個shared memory的使用範例，使用到簡單的Linux API做共享記憶體的分配。(c sample code: an example of the Linux shared memory user space API usage to demonstrate how to use those API fluently)