linux下的FTP服务器，使用C开发，GCC编译；实现文件的上传、下载、断点续传；技术点：守候进程、进程间通讯、管道、soket编程、文件I/O标准库函数与系统调用、文件权限管理,FTP server under linux, using the C Development, GCC compiler file upload, download, HTTP technical point: waiting for the process of inter-process communica