基本概念 用户程序调用 Fd=fopen("/dev/hda"O RDWR,op: read(buff, fd, size write(fd, buff, sife) close(fd) Virtual file system Generic file reado Generic_file_ write 块设备文件 建立设备 #mknod dev/ dev name type major number minor number Linux Device moduleLinux Device & Module 4 基本概念 用户程序调用 Fd=fopen(“/dev/hda”,O_RDWR,0); read(buff,fd,size) write(fd,buff,size) close(fd) Virtual file system Generic_file_read() Generic_file_write() 块设备文件 建立设备： #mknod /dev/dev_name type major_number minor_number