linux下用C语言写的聊天程序！/*BUG and NOTE: Not join protect to Shared Memory Segments,example Semaphore Arrays. Not check the parameters validity. When transmit may be error. If the client program no right exit,others cannot know,the service program sh

tune timing of read data command when crc error happen no performance impact. -tune timing of read data command when crc error happen no performance impact.