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if((mkfifo(FIFO_SERVER,O_CREAT|O_EXCL) <0)&&errno!=EEXIST)
printf("canot create answer fifo server\n");
printf("service was started succussfully!...\n");
while (1)
{
tempPID=0;
memset(answerBuffer,0,sizeof(answerBuffer));
fdr=open(FIFO_SERVER,O_RDONLY,NULL);
if(fdr==-1){
perror("open error");
printf("open error,the service will be shut down!");
exit(1);
}
memset(answerBuffer,0,sizeof(answerBuffer)); //recived the message
if((nread=read(fdr,answerBuffer,100))==-1){
if(errno==EAGAIN)
printf("no data yet\n");
}
printf("%s\n",answerBuffer);
tempPID=GetPID(answerBuffer);
printf("PID=%d's message!\n",tempPID);
if (!IsInGroup(PID,tempPID,fifoNUM)){ //new PID is not in exist group
PID[fifoNUM]=tempPID; //save new PID
fifoNUM++; //max number ++
}
for (i=0;i <fifoNUM;i++){
//}}****************************************************************//
if (fork()==0){
//{{********send message


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#include"stdio.h"
#include"stdlib.h"
void ContrTwo(char i)
{
char str1[8];
itoa(i,str1,2);
printf("%s",str1);
}
unsigned char leftRot(char str,int i);
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