minigui 串口输入驱动输入引擎 数据通过串口打包发送而来 直接向平台发送消息-MiniGUI serial input-driven engines imported through the serial data from a package sent directly to the messaging platform

向目的主机发送带回送消息的ICMP数据包,并对目的主机返回的ICMP数据包进行解析,判断目的主机是否处于活动状态-To the purpose of the host to send a message to send back ICMP packets, and the purpose of the host returns ICMP packet parsing to determine the purpose of the host is active

1、 用C语言写一个程序名字为procs4，该程序运行过程中共有4个进程，procs4程序（父进程）创建2个子进程p1和p2，p1子进程再创建一个子进程p3。4个进程完成如下工作: 父进程并打印字符串“I am main process”；p1子进程打印“I am child process p1”字符串；p2子进程打印“I am child process p2”；子进程p3打印字符串“I am child process p3”，然后使用exec（族）系统调用打印当前目录下文件和子目录下

消息队列提供了一种由一个进程向另一个进程发送块数据的方法。另外，每一个数据块被看作有一个类型，而接收进程可以独立接收具有不同类型的数据块。 -Message queue is provided a transmission block of data one process to another process method. Also, each data block is treated as a type, the receiving process can independentl

通过socket通信，发送消息数据，及文件，消息数据大小不超过1024bit(Through socket communication, message data, and files are sent, and the size of the message data is not more than 1024bit)