文件名称:virtual
介绍说明－－下载内容均来自于网络，请自行研究使用
在多任务操作系统环境下，不允许用户态程序直接执行I/O指令，操作I/O设备，I/O指令只能由运行系统太（内核态）的程序执行，即只能由操作系统内核的代码执行。
-In the multi-tasking operating system environment, the program does not allow users to state directly perform I/O instruction, the operation I/O devices, I/O instructions can only be so by the operating system (kernel mode) of the program execution, that is, only by the operating system kernel code execution.
-In the multi-tasking operating system environment, the program does not allow users to state directly perform I/O instruction, the operation I/O devices, I/O instructions can only be so by the operating system (kernel mode) of the program execution, that is, only by the operating system kernel code execution.
(系统自动生成,下载前可以参看下载内容)
下载文件列表
test_demo.c
demo.c
demo.o
Makefile.txt
test.c
test_demo
demo.c
demo.o
Makefile.txt
test.c
test_demo